diff options
Diffstat (limited to 'drivers/scsi/esp.c')
| -rw-r--r-- | drivers/scsi/esp.c | 4394 |
1 files changed, 0 insertions, 4394 deletions
diff --git a/drivers/scsi/esp.c b/drivers/scsi/esp.c deleted file mode 100644 index 2c2fe80bc42..00000000000 --- a/drivers/scsi/esp.c +++ /dev/null @@ -1,4394 +0,0 @@ -/* esp.c: ESP Sun SCSI driver. - * - * Copyright (C) 1995, 1998, 2006 David S. Miller (davem@davemloft.net) - */ - -/* TODO: - * - * 1) Maybe disable parity checking in config register one for SCSI1 - * targets. (Gilmore says parity error on the SBus can lock up - * old sun4c's) - * 2) Add support for DMA2 pipelining. - * 3) Add tagged queueing. - */ - -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/types.h> -#include <linux/string.h> -#include <linux/slab.h> -#include <linux/blkdev.h> -#include <linux/proc_fs.h> -#include <linux/stat.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/module.h> - -#include "esp.h" - -#include <asm/sbus.h> -#include <asm/dma.h> -#include <asm/system.h> -#include <asm/ptrace.h> -#include <asm/pgtable.h> -#include <asm/oplib.h> -#include <asm/io.h> -#include <asm/irq.h> -#ifndef __sparc_v9__ -#include <asm/machines.h> -#include <asm/idprom.h> -#endif - -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_eh.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_tcq.h> - -#define DRV_VERSION "1.101" - -#define DEBUG_ESP -/* #define DEBUG_ESP_HME */ -/* #define DEBUG_ESP_DATA */ -/* #define DEBUG_ESP_QUEUE */ -/* #define DEBUG_ESP_DISCONNECT */ -/* #define DEBUG_ESP_STATUS */ -/* #define DEBUG_ESP_PHASES */ -/* #define DEBUG_ESP_WORKBUS */ -/* #define DEBUG_STATE_MACHINE */ -/* #define DEBUG_ESP_CMDS */ -/* #define DEBUG_ESP_IRQS */ -/* #define DEBUG_SDTR */ -/* #define DEBUG_ESP_SG */ - -/* Use the following to sprinkle debugging messages in a way which - * suits you if combinations of the above become too verbose when - * trying to track down a specific problem. - */ -/* #define DEBUG_ESP_MISC */ - -#if defined(DEBUG_ESP) -#define ESPLOG(foo) printk foo -#else -#define ESPLOG(foo) -#endif /* (DEBUG_ESP) */ - -#if defined(DEBUG_ESP_HME) -#define ESPHME(foo) printk foo -#else -#define ESPHME(foo) -#endif - -#if defined(DEBUG_ESP_DATA) -#define ESPDATA(foo) printk foo -#else -#define ESPDATA(foo) -#endif - -#if defined(DEBUG_ESP_QUEUE) -#define ESPQUEUE(foo) printk foo -#else -#define ESPQUEUE(foo) -#endif - -#if defined(DEBUG_ESP_DISCONNECT) -#define ESPDISC(foo) printk foo -#else -#define ESPDISC(foo) -#endif - -#if defined(DEBUG_ESP_STATUS) -#define ESPSTAT(foo) printk foo -#else -#define ESPSTAT(foo) -#endif - -#if defined(DEBUG_ESP_PHASES) -#define ESPPHASE(foo) printk foo -#else -#define ESPPHASE(foo) -#endif - -#if defined(DEBUG_ESP_WORKBUS) -#define ESPBUS(foo) printk foo -#else -#define ESPBUS(foo) -#endif - -#if defined(DEBUG_ESP_IRQS) -#define ESPIRQ(foo) printk foo -#else -#define ESPIRQ(foo) -#endif - -#if defined(DEBUG_SDTR) -#define ESPSDTR(foo) printk foo -#else -#define ESPSDTR(foo) -#endif - -#if defined(DEBUG_ESP_MISC) -#define ESPMISC(foo) printk foo -#else -#define ESPMISC(foo) -#endif - -/* Command phase enumeration. */ -enum { - not_issued = 0x00, /* Still in the issue_SC queue. */ - - /* Various forms of selecting a target. */ -#define in_slct_mask 0x10 - in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ - in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ - in_slct_msg = 0x12, /* select, then send a message */ - in_slct_tag = 0x13, /* select and send tagged queue msg */ - in_slct_sneg = 0x14, /* select and acquire sync capabilities */ - - /* Any post selection activity. */ -#define in_phases_mask 0x20 - in_datain = 0x20, /* Data is transferring from the bus */ - in_dataout = 0x21, /* Data is transferring to the bus */ - in_data_done = 0x22, /* Last DMA data operation done (maybe) */ - in_msgin = 0x23, /* Eating message from target */ - in_msgincont = 0x24, /* Eating more msg bytes from target */ - in_msgindone = 0x25, /* Decide what to do with what we got */ - in_msgout = 0x26, /* Sending message to target */ - in_msgoutdone = 0x27, /* Done sending msg out */ - in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ - in_cmdend = 0x29, /* Done sending slow cmd */ - in_status = 0x2a, /* Was in status phase, finishing cmd */ - in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ - in_the_dark = 0x2c, /* Don't know what bus phase we are in */ - - /* Special states, ie. not normal bus transitions... */ -#define in_spec_mask 0x80 - in_abortone = 0x80, /* Aborting one command currently */ - in_abortall = 0x81, /* Blowing away all commands we have */ - in_resetdev = 0x82, /* SCSI target reset in progress */ - in_resetbus = 0x83, /* SCSI bus reset in progress */ - in_tgterror = 0x84, /* Target did something stupid */ -}; - -enum { - /* Zero has special meaning, see skipahead[12]. */ -/*0*/ do_never, - -/*1*/ do_phase_determine, -/*2*/ do_reset_bus, -/*3*/ do_reset_complete, -/*4*/ do_work_bus, -/*5*/ do_intr_end -}; - -/* Forward declarations. */ -static irqreturn_t esp_intr(int irq, void *dev_id); - -/* Debugging routines */ -struct esp_cmdstrings { - u8 cmdchar; - char *text; -} esp_cmd_strings[] = { - /* Miscellaneous */ - { ESP_CMD_NULL, "ESP_NOP", }, - { ESP_CMD_FLUSH, "FIFO_FLUSH", }, - { ESP_CMD_RC, "RSTESP", }, - { ESP_CMD_RS, "RSTSCSI", }, - /* Disconnected State Group */ - { ESP_CMD_RSEL, "RESLCTSEQ", }, - { ESP_CMD_SEL, "SLCTNATN", }, - { ESP_CMD_SELA, "SLCTATN", }, - { ESP_CMD_SELAS, "SLCTATNSTOP", }, - { ESP_CMD_ESEL, "ENSLCTRESEL", }, - { ESP_CMD_DSEL, "DISSELRESEL", }, - { ESP_CMD_SA3, "SLCTATN3", }, - { ESP_CMD_RSEL3, "RESLCTSEQ", }, - /* Target State Group */ - { ESP_CMD_SMSG, "SNDMSG", }, - { ESP_CMD_SSTAT, "SNDSTATUS", }, - { ESP_CMD_SDATA, "SNDDATA", }, - { ESP_CMD_DSEQ, "DISCSEQ", }, - { ESP_CMD_TSEQ, "TERMSEQ", }, - { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, - { ESP_CMD_DCNCT, "DISC", }, - { ESP_CMD_RMSG, "RCVMSG", }, - { ESP_CMD_RCMD, "RCVCMD", }, - { ESP_CMD_RDATA, "RCVDATA", }, - { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, - /* Initiator State Group */ - { ESP_CMD_TI, "TRANSINFO", }, - { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, - { ESP_CMD_MOK, "MSGACCEPTED", }, - { ESP_CMD_TPAD, "TPAD", }, - { ESP_CMD_SATN, "SATN", }, - { ESP_CMD_RATN, "RATN", }, -}; -#define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) - -/* Print textual representation of an ESP command */ -static inline void esp_print_cmd(u8 espcmd) -{ - u8 dma_bit = espcmd & ESP_CMD_DMA; - int i; - - espcmd &= ~dma_bit; - for (i = 0; i < NUM_ESP_COMMANDS; i++) - if (esp_cmd_strings[i].cmdchar == espcmd) - break; - if (i == NUM_ESP_COMMANDS) - printk("ESP_Unknown"); - else - printk("%s%s", esp_cmd_strings[i].text, - ((dma_bit) ? "+DMA" : "")); -} - -/* Print the status register's value */ -static inline void esp_print_statreg(u8 statreg) -{ - u8 phase; - - printk("STATUS<"); - phase = statreg & ESP_STAT_PMASK; - printk("%s,", (phase == ESP_DOP ? "DATA-OUT" : - (phase == ESP_DIP ? "DATA-IN" : - (phase == ESP_CMDP ? "COMMAND" : - (phase == ESP_STATP ? "STATUS" : - (phase == ESP_MOP ? "MSG-OUT" : - (phase == ESP_MIP ? "MSG_IN" : - "unknown"))))))); - if (statreg & ESP_STAT_TDONE) - printk("TRANS_DONE,"); - if (statreg & ESP_STAT_TCNT) - printk("TCOUNT_ZERO,"); - if (statreg & ESP_STAT_PERR) - printk("P_ERROR,"); - if (statreg & ESP_STAT_SPAM) - printk("SPAM,"); - if (statreg & ESP_STAT_INTR) - printk("IRQ,"); - printk(">"); -} - -/* Print the interrupt register's value */ -static inline void esp_print_ireg(u8 intreg) -{ - printk("INTREG< "); - if (intreg & ESP_INTR_S) - printk("SLCT_NATN "); - if (intreg & ESP_INTR_SATN) - printk("SLCT_ATN "); - if (intreg & ESP_INTR_RSEL) - printk("RSLCT "); - if (intreg & ESP_INTR_FDONE) - printk("FDONE "); - if (intreg & ESP_INTR_BSERV) - printk("BSERV "); - if (intreg & ESP_INTR_DC) - printk("DISCNCT "); - if (intreg & ESP_INTR_IC) - printk("ILL_CMD "); - if (intreg & ESP_INTR_SR) - printk("SCSI_BUS_RESET "); - printk(">"); -} - -/* Print the sequence step registers contents */ -static inline void esp_print_seqreg(u8 stepreg) -{ - stepreg &= ESP_STEP_VBITS; - printk("STEP<%s>", - (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : - (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : - (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : - (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : - (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : - "UNKNOWN")))))); -} - -static char *phase_string(int phase) -{ - switch (phase) { - case not_issued: - return "UNISSUED"; - case in_slct_norm: - return "SLCTNORM"; - case in_slct_stop: - return "SLCTSTOP"; - case in_slct_msg: - return "SLCTMSG"; - case in_slct_tag: - return "SLCTTAG"; - case in_slct_sneg: - return "SLCTSNEG"; - case in_datain: - return "DATAIN"; - case in_dataout: - return "DATAOUT"; - case in_data_done: - return "DATADONE"; - case in_msgin: - return "MSGIN"; - case in_msgincont: - return "MSGINCONT"; - case in_msgindone: - return "MSGINDONE"; - case in_msgout: - return "MSGOUT"; - case in_msgoutdone: - return "MSGOUTDONE"; - case in_cmdbegin: - return "CMDBEGIN"; - case in_cmdend: - return "CMDEND"; - case in_status: - return "STATUS"; - case in_freeing: - return "FREEING"; - case in_the_dark: - return "CLUELESS"; - case in_abortone: - return "ABORTONE"; - case in_abortall: - return "ABORTALL"; - case in_resetdev: - return "RESETDEV"; - case in_resetbus: - return "RESETBUS"; - case in_tgterror: - return "TGTERROR"; - default: - return "UNKNOWN"; - }; -} - -#ifdef DEBUG_STATE_MACHINE -static inline void esp_advance_phase(struct scsi_cmnd *s, int newphase) -{ - ESPLOG(("<%s>", phase_string(newphase))); - s->SCp.sent_command = s->SCp.phase; - s->SCp.phase = newphase; -} -#else -#define esp_advance_phase(__s, __newphase) \ - (__s)->SCp.sent_command = (__s)->SCp.phase; \ - (__s)->SCp.phase = (__newphase); -#endif - -#ifdef DEBUG_ESP_CMDS -static inline void esp_cmd(struct esp *esp, u8 cmd) -{ - esp->espcmdlog[esp->espcmdent] = cmd; - esp->espcmdent = (esp->espcmdent + 1) & 31; - sbus_writeb(cmd, esp->eregs + ESP_CMD); -} -#else -#define esp_cmd(__esp, __cmd) \ - sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD) -#endif - -#define ESP_INTSOFF(__dregs) \ - sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR) -#define ESP_INTSON(__dregs) \ - sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR) -#define ESP_IRQ_P(__dregs) \ - (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR)) - -/* How we use the various Linux SCSI data structures for operation. - * - * struct scsi_cmnd: - * - * We keep track of the synchronous capabilities of a target - * in the device member, using sync_min_period and - * sync_max_offset. These are the values we directly write - * into the ESP registers while running a command. If offset - * is zero the ESP will use asynchronous transfers. - * If the borken flag is set we assume we shouldn't even bother - * trying to negotiate for synchronous transfer as this target - * is really stupid. If we notice the target is dropping the - * bus, and we have been allowing it to disconnect, we clear - * the disconnect flag. - */ - - -/* Manipulation of the ESP command queues. Thanks to the aha152x driver - * and its author, Juergen E. Fischer, for the methods used here. - * Note that these are per-ESP queues, not global queues like - * the aha152x driver uses. - */ -static inline void append_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC) -{ - struct scsi_cmnd *end; - - new_SC->host_scribble = (unsigned char *) NULL; - if (!*SC) - *SC = new_SC; - else { - for (end=*SC;end->host_scribble;end=(struct scsi_cmnd *)end->host_scribble) - ; - end->host_scribble = (unsigned char *) new_SC; - } -} - -static inline void prepend_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC) -{ - new_SC->host_scribble = (unsigned char *) *SC; - *SC = new_SC; -} - -static inline struct scsi_cmnd *remove_first_SC(struct scsi_cmnd **SC) -{ - struct scsi_cmnd *ptr; - ptr = *SC; - if (ptr) - *SC = (struct scsi_cmnd *) (*SC)->host_scribble; - return ptr; -} - -static inline struct scsi_cmnd *remove_SC(struct scsi_cmnd **SC, int target, int lun) -{ - struct scsi_cmnd *ptr, *prev; - - for (ptr = *SC, prev = NULL; - ptr && ((ptr->device->id != target) || (ptr->device->lun != lun)); - prev = ptr, ptr = (struct scsi_cmnd *) ptr->host_scribble) - ; - if (ptr) { - if (prev) - prev->host_scribble=ptr->host_scribble; - else - *SC=(struct scsi_cmnd *)ptr->host_scribble; - } - return ptr; -} - -/* Resetting various pieces of the ESP scsi driver chipset/buses. */ -static void esp_reset_dma(struct esp *esp) -{ - int can_do_burst16, can_do_burst32, can_do_burst64; - int can_do_sbus64; - u32 tmp; - - can_do_burst16 = (esp->bursts & DMA_BURST16) != 0; - can_do_burst32 = (esp->bursts & DMA_BURST32) != 0; - can_do_burst64 = 0; - can_do_sbus64 = 0; - if (sbus_can_dma_64bit(esp->sdev)) - can_do_sbus64 = 1; - if (sbus_can_burst64(esp->sdev)) - can_do_burst64 = (esp->bursts & DMA_BURST64) != 0; - - /* Punt the DVMA into a known state. */ - if (esp->dma->revision != dvmahme) { - tmp = sbus_readl(esp->dregs + DMA_CSR); - sbus_writel(tmp | DMA_RST_SCSI, esp->dregs + DMA_CSR); - sbus_writel(tmp & ~DMA_RST_SCSI, esp->dregs + DMA_CSR); - } - switch (esp->dma->revision) { - case dvmahme: - /* This is the HME DVMA gate array. */ - - sbus_writel(DMA_RESET_FAS366, esp->dregs + DMA_CSR); - sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR); - - esp->prev_hme_dmacsr = (DMA_PARITY_OFF|DMA_2CLKS|DMA_SCSI_DISAB|DMA_INT_ENAB); - esp->prev_hme_dmacsr &= ~(DMA_ENABLE|DMA_ST_WRITE|DMA_BRST_SZ); - - if (can_do_burst64) - esp->prev_hme_dmacsr |= DMA_BRST64; - else if (can_do_burst32) - esp->prev_hme_dmacsr |= DMA_BRST32; - - if (can_do_sbus64) { - esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64; - sbus_set_sbus64(esp->sdev, esp->bursts); - } - - /* This chip is horrible. */ - while (sbus_readl(esp->dregs + DMA_CSR) & DMA_PEND_READ) - udelay(1); - - sbus_writel(0, esp->dregs + DMA_CSR); - sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR); - - /* This is necessary to avoid having the SCSI channel - * engine lock up on us. - */ - sbus_writel(0, esp->dregs + DMA_ADDR); - - break; - case dvmarev2: - /* This is the gate array found in the sun4m - * NCR SBUS I/O subsystem. - */ - if (esp->erev != esp100) { - tmp = sbus_readl(esp->dregs + DMA_CSR); - sbus_writel(tmp | DMA_3CLKS, esp->dregs + DMA_CSR); - } - break; - case dvmarev3: - tmp = sbus_readl(esp->dregs + DMA_CSR); - tmp &= ~DMA_3CLKS; - tmp |= DMA_2CLKS; - if (can_do_burst32) { - tmp &= ~DMA_BRST_SZ; - tmp |= DMA_BRST32; - } - sbus_writel(tmp, esp->dregs + DMA_CSR); - break; - case dvmaesc1: - /* This is the DMA unit found on SCSI/Ether cards. */ - tmp = sbus_readl(esp->dregs + DMA_CSR); - tmp |= DMA_ADD_ENABLE; - tmp &= ~DMA_BCNT_ENAB; - if (!can_do_burst32 && can_do_burst16) { - tmp |= DMA_ESC_BURST; - } else { - tmp &= ~(DMA_ESC_BURST); - } - sbus_writel(tmp, esp->dregs + DMA_CSR); - break; - default: - break; - }; - ESP_INTSON(esp->dregs); -} - -/* Reset the ESP chip, _not_ the SCSI bus. */ -static void __init esp_reset_esp(struct esp *esp) -{ - u8 family_code, version; - int i; - - /* Now reset the ESP chip */ - esp_cmd(esp, ESP_CMD_RC); - esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); - esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA); - - /* Reload the configuration registers */ - sbus_writeb(esp->cfact, esp->eregs + ESP_CFACT); - esp->prev_stp = 0; - sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP); - esp->prev_soff = 0; - sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF); - sbus_writeb(esp->neg_defp, esp->eregs + ESP_TIMEO); - - /* This is the only point at which it is reliable to read - * the ID-code for a fast ESP chip variants. - */ - esp->max_period = ((35 * esp->ccycle) / 1000); - if (esp->erev == fast) { - version = sbus_readb(esp->eregs + ESP_UID); - family_code = (version & 0xf8) >> 3; - if (family_code == 0x02) - esp->erev = fas236; - else if (family_code == 0x0a) - esp->erev = fashme; /* Version is usually '5'. */ - else - esp->erev = fas100a; - ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n", - esp->esp_id, - (esp->erev == fas236) ? "fas236" : - ((esp->erev == fas100a) ? "fas100a" : - "fasHME"), family_code, (version & 7))); - - esp->min_period = ((4 * esp->ccycle) / 1000); - } else { - esp->min_period = ((5 * esp->ccycle) / 1000); - } - esp->max_period = (esp->max_period + 3)>>2; - esp->min_period = (esp->min_period + 3)>>2; - - sbus_writeb(esp->config1, esp->eregs + ESP_CFG1); - switch (esp->erev) { - case esp100: - /* nothing to do */ - break; - case esp100a: - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - break; - case esp236: - /* Slow 236 */ - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - esp->prev_cfg3 = esp->config3[0]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - break; - case fashme: - esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB); - /* fallthrough... */ - case fas236: - /* Fast 236 or HME */ - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - for (i = 0; i < 16; i++) { - if (esp->erev == fashme) { - u8 cfg3; - - cfg3 = ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH; - if (esp->scsi_id >= 8) - cfg3 |= ESP_CONFIG3_IDBIT3; - esp->config3[i] |= cfg3; - } else { - esp->config3[i] |= ESP_CONFIG3_FCLK; - } - } - esp->prev_cfg3 = esp->config3[0]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - if (esp->erev == fashme) { - esp->radelay = 80; - } else { - if (esp->diff) - esp->radelay = 0; - else - esp->radelay = 96; - } - break; - case fas100a: - /* Fast 100a */ - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - for (i = 0; i < 16; i++) - esp->config3[i] |= ESP_CONFIG3_FCLOCK; - esp->prev_cfg3 = esp->config3[0]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - esp->radelay = 32; - break; - default: - panic("esp: what could it be... I wonder..."); - break; - }; - - /* Eat any bitrot in the chip */ - sbus_readb(esp->eregs + ESP_INTRPT); - udelay(100); -} - -/* This places the ESP into a known state at boot time. */ -static void __init esp_bootup_reset(struct esp *esp) -{ - u8 tmp; - - /* Reset the DMA */ - esp_reset_dma(esp); - - /* Reset the ESP */ - esp_reset_esp(esp); - - /* Reset the SCSI bus, but tell ESP not to generate an irq */ - tmp = sbus_readb(esp->eregs + ESP_CFG1); - tmp |= ESP_CONFIG1_SRRDISAB; - sbus_writeb(tmp, esp->eregs + ESP_CFG1); - - esp_cmd(esp, ESP_CMD_RS); - udelay(400); - - sbus_writeb(esp->config1, esp->eregs + ESP_CFG1); - - /* Eat any bitrot in the chip and we are done... */ - sbus_readb(esp->eregs + ESP_INTRPT); -} - -static int __init esp_find_dvma(struct esp *esp, struct sbus_dev *dma_sdev) -{ - struct sbus_dev *sdev = esp->sdev; - struct sbus_dma *dma; - - if (dma_sdev != NULL) { - for_each_dvma(dma) { - if (dma->sdev == dma_sdev) - break; - } - } else { - for_each_dvma(dma) { - /* If allocated already, can't use it. */ - if (dma->allocated) - continue; - - if (dma->sdev == NULL) - break; - - /* If bus + slot are the same and it has the - * correct OBP name, it's ours. - */ - if (sdev->bus == dma->sdev->bus && - sdev->slot == dma->sdev->slot && - (!strcmp(dma->sdev->prom_name, "dma") || - !strcmp(dma->sdev->prom_name, "espdma"))) - break; - } - } - - /* If we don't know how to handle the dvma, - * do not use this device. - */ - if (dma == NULL) { - printk("Cannot find dvma for ESP%d's SCSI\n", esp->esp_id); - return -1; - } - if (dma->allocated) { - printk("esp%d: can't use my espdma\n", esp->esp_id); - return -1; - } - dma->allocated = 1; - esp->dma = dma; - esp->dregs = dma->regs; - - return 0; -} - -static int __init esp_map_regs(struct esp *esp, int hme) -{ - struct sbus_dev *sdev = esp->sdev; - struct resource *res; - - /* On HME, two reg sets exist, first is DVMA, - * second is ESP registers. - */ - if (hme) - res = &sdev->resource[1]; - else - res = &sdev->resource[0]; - - esp->eregs = sbus_ioremap(res, 0, ESP_REG_SIZE, "ESP Registers"); - - if (esp->eregs == 0) - return -1; - return 0; -} - -static int __init esp_map_cmdarea(struct esp *esp) -{ - struct sbus_dev *sdev = esp->sdev; - - esp->esp_command = sbus_alloc_consistent(sdev, 16, - &esp->esp_command_dvma); - if (esp->esp_command == NULL || - esp->esp_command_dvma == 0) - return -1; - return 0; -} - -static int __init esp_register_irq(struct esp *esp) -{ - esp->ehost->irq = esp->irq = esp->sdev->irqs[0]; - - /* We used to try various overly-clever things to - * reduce the interrupt processing overhead on - * sun4c/sun4m when multiple ESP's shared the - * same IRQ. It was too complex and messy to - * sanely maintain. - */ - if (request_irq(esp->ehost->irq, esp_intr, - IRQF_SHARED, "ESP SCSI", esp)) { - printk("esp%d: Cannot acquire irq line\n", - esp->esp_id); - return -1; - } - - printk("esp%d: IRQ %d ", esp->esp_id, - esp->ehost->irq); - - return 0; -} - -static void __init esp_get_scsi_id(struct esp *esp) -{ - struct sbus_dev *sdev = esp->sdev; - struct device_node *dp = sdev->ofdev.node; - - esp->scsi_id = of_getintprop_default(dp, - "initiator-id", - -1); - if (esp->scsi_id == -1) - esp->scsi_id = of_getintprop_default(dp, - "scsi-initiator-id", - -1); - if (esp->scsi_id == -1) - esp->scsi_id = (sdev->bus == NULL) ? 7 : - of_getintprop_default(sdev->bus->ofdev.node, - "scsi-initiator-id", - 7); - esp->ehost->this_id = esp->scsi_id; - esp->scsi_id_mask = (1 << esp->scsi_id); - -} - -static void __init esp_get_clock_params(struct esp *esp) -{ - struct sbus_dev *sdev = esp->sdev; - int prom_node = esp->prom_node; - int sbus_prom_node; - unsigned int fmhz; - u8 ccf; - - if (sdev != NULL && sdev->bus != NULL) - sbus_prom_node = sdev->bus->prom_node; - else - sbus_prom_node = 0; - - /* This is getting messy but it has to be done - * correctly or else you get weird behavior all - * over the place. We are trying to basically - * figure out three pieces of information. - * - * a) Clock Conversion Factor - * - * This is a representation of the input - * crystal clock frequency going into the - * ESP on this machine. Any operation whose - * timing is longer than 400ns depends on this - * value being correct. For example, you'll - * get blips for arbitration/selection during - * high load or with multiple targets if this - * is not set correctly. - * - * b) Selection Time-Out - * - * The ESP isn't very bright and will arbitrate - * for the bus and try to select a target - * forever if you let it. This value tells - * the ESP when it has taken too long to - * negotiate and that it should interrupt - * the CPU so we can see what happened. - * The value is computed as follows (from - * NCR/Symbios chip docs). - * - * (Time Out Period) * (Input Clock) - * STO = ---------------------------------- - * (8192) * (Clock Conversion Factor) - * - * You usually want the time out period to be - * around 250ms, I think we'll set it a little - * bit higher to account for fully loaded SCSI - * bus's and slow devices that don't respond so - * quickly to selection attempts. (yeah, I know - * this is out of spec. but there is a lot of - * buggy pieces of firmware out there so bite me) - * - * c) Imperical constants for synchronous offset - * and transfer period register values - * - * This entails the smallest and largest sync - * period we could ever handle on this ESP. - */ - - fmhz = prom_getintdefault(prom_node, "clock-frequency", -1); - if (fmhz == -1) - fmhz = (!sbus_prom_node) ? 0 : - prom_getintdefault(sbus_prom_node, "clock-frequency", -1); - - if (fmhz <= (5000000)) - ccf = 0; - else - ccf = (((5000000 - 1) + (fmhz))/(5000000)); - - if (!ccf || ccf > 8) { - /* If we can't find anything reasonable, - * just assume 20MHZ. This is the clock - * frequency of the older sun4c's where I've - * been unable to find the clock-frequency - * PROM property. All other machines provide - * useful values it seems. - */ - ccf = ESP_CCF_F4; - fmhz = (20000000); - } - - if (ccf == (ESP_CCF_F7 + 1)) - esp->cfact = ESP_CCF_F0; - else if (ccf == ESP_CCF_NEVER) - esp->cfact = ESP_CCF_F2; - else - esp->cfact = ccf; - esp->raw_cfact = ccf; - - esp->cfreq = fmhz; - esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); - esp->ctick = ESP_TICK(ccf, esp->ccycle); - esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); - esp->sync_defp = SYNC_DEFP_SLOW; - - printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ", - esp->scsi_id, (fmhz / 1000000), - (int)esp->ccycle, (int)ccf, (int) esp->neg_defp); -} - -static void __init esp_get_bursts(struct esp *esp, struct sbus_dev *dma) -{ - struct sbus_dev *sdev = esp->sdev; - u8 bursts; - - bursts = prom_getintdefault(esp->prom_node, "burst-sizes", 0xff); - - if (dma) { - u8 tmp = prom_getintdefault(dma->prom_node, - "burst-sizes", 0xff); - if (tmp != 0xff) - bursts &= tmp; - } - - if (sdev->bus) { - u8 tmp = prom_getintdefault(sdev->bus->prom_node, - "burst-sizes", 0xff); - if (tmp != 0xff) - bursts &= tmp; - } - - if (bursts == 0xff || - (bursts & DMA_BURST16) == 0 || - (bursts & DMA_BURST32) == 0) - bursts = (DMA_BURST32 - 1); - - esp->bursts = bursts; -} - -static void __init esp_get_revision(struct esp *esp) -{ - u8 tmp; - - esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); - esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - - tmp = sbus_readb(esp->eregs + ESP_CFG2); - tmp &= ~ESP_CONFIG2_MAGIC; - if (tmp != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { - /* If what we write to cfg2 does not come back, cfg2 - * is not implemented, therefore this must be a plain - * esp100. - */ - esp->erev = esp100; - printk("NCR53C90(esp100)\n"); - } else { - esp->config2 = 0; - esp->prev_cfg3 = esp->config3[0] = 5; - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - sbus_writeb(0, esp->eregs + ESP_CFG3); - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - - tmp = sbus_readb(esp->eregs + ESP_CFG3); - if (tmp != 5) { - /* The cfg2 register is implemented, however - * cfg3 is not, must be esp100a. - */ - esp->erev = esp100a; - printk("NCR53C90A(esp100a)\n"); - } else { - int target; - - for (target = 0; target < 16; target++) - esp->config3[target] = 0; - esp->prev_cfg3 = 0; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - - /* All of cfg{1,2,3} implemented, must be one of - * the fas variants, figure out which one. - */ - if (esp->raw_cfact > ESP_CCF_F5) { - esp->erev = fast; - esp->sync_defp = SYNC_DEFP_FAST; - printk("NCR53C9XF(espfast)\n"); - } else { - esp->erev = esp236; - printk("NCR53C9x(esp236)\n"); - } - esp->config2 = 0; - sbus_writeb(esp->config2, esp->eregs + ESP_CFG2); - } - } -} - -static void __init esp_init_swstate(struct esp *esp) -{ - int i; - - /* Command queues... */ - esp->current_SC = NULL; - esp->disconnected_SC = NULL; - esp->issue_SC = NULL; - - /* Target and current command state... */ - esp->targets_present = 0; - esp->resetting_bus = 0; - esp->snip = 0; - - init_waitqueue_head(&esp->reset_queue); - - /* Debugging... */ - for(i = 0; i < 32; i++) - esp->espcmdlog[i] = 0; - esp->espcmdent = 0; - - /* MSG phase state... */ - for(i = 0; i < 16; i++) { - esp->cur_msgout[i] = 0; - esp->cur_msgin[i] = 0; - } - esp->prevmsgout = esp->prevmsgin = 0; - esp->msgout_len = esp->msgin_len = 0; - - /* Clear the one behind caches to hold unmatchable values. */ - esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff; - esp->prev_hme_dmacsr = 0xffffffff; -} - -static int __init detect_one_esp(struct scsi_host_template *tpnt, - struct device *dev, - struct sbus_dev *esp_dev, - struct sbus_dev *espdma, - struct sbus_bus *sbus, - int hme) -{ - static int instance; - struct Scsi_Host *esp_host = scsi_host_alloc(tpnt, sizeof(struct esp)); - struct esp *esp; - - if (!esp_host) - return -ENOMEM; - - if (hme) - esp_host->max_id = 16; - esp = (struct esp *) esp_host->hostdata; - esp->ehost = esp_host; - esp->sdev = esp_dev; - esp->esp_id = instance; - esp->prom_node = esp_dev->prom_node; - prom_getstring(esp->prom_node, "name", esp->prom_name, - sizeof(esp->prom_name)); - - if (esp_find_dvma(esp, espdma) < 0) - goto fail_unlink; - if (esp_map_regs(esp, hme) < 0) { - printk("ESP registers unmappable"); - goto fail_dvma_release; - } - if (esp_map_cmdarea(esp) < 0) { - printk("ESP DVMA transport area unmappable"); - goto fail_unmap_regs; - } - if (esp_register_irq(esp) < 0) - goto fail_unmap_cmdarea; - - esp_get_scsi_id(esp); - - esp->diff = prom_getbool(esp->prom_node, "differential"); - if (esp->diff) - printk("Differential "); - - esp_get_clock_params(esp); - esp_get_bursts(esp, espdma); - esp_get_revision(esp); - esp_init_swstate(esp); - - esp_bootup_reset(esp); - - if (scsi_add_host(esp_host, dev)) - goto fail_free_irq; - - dev_set_drvdata(&esp_dev->ofdev.dev, esp); - - scsi_scan_host(esp_host); - instance++; - - return 0; - -fail_free_irq: - free_irq(esp->ehost->irq, esp); - -fail_unmap_cmdarea: - sbus_free_consistent(esp->sdev, 16, - (void *) esp->esp_command, - esp->esp_command_dvma); - -fail_unmap_regs: - sbus_iounmap(esp->eregs, ESP_REG_SIZE); - -fail_dvma_release: - esp->dma->allocated = 0; - -fail_unlink: - scsi_host_put(esp_host); - return -1; -} - -/* Detecting ESP chips on the machine. This is the simple and easy - * version. - */ -static int __devexit esp_remove_common(struct esp *esp) -{ - unsigned int irq = esp->ehost->irq; - - scsi_remove_host(esp->ehost); - - ESP_INTSOFF(esp->dregs); -#if 0 - esp_reset_dma(esp); - esp_reset_esp(esp); -#endif - - free_irq(irq, esp); - sbus_free_consistent(esp->sdev, 16, - (void *) esp->esp_command, esp->esp_command_dvma); - sbus_iounmap(esp->eregs, ESP_REG_SIZE); - esp->dma->allocated = 0; - - scsi_host_put(esp->ehost); - - return 0; -} - - -#ifdef CONFIG_SUN4 - -#include <asm/sun4paddr.h> - -static struct sbus_dev sun4_esp_dev; - -static int __init esp_sun4_probe(struct scsi_host_template *tpnt) -{ - if (sun4_esp_physaddr) { - memset(&sun4_esp_dev, 0, sizeof(sun4_esp_dev)); - sun4_esp_dev.reg_addrs[0].phys_addr = sun4_esp_physaddr; - sun4_esp_dev.irqs[0] = 4; - sun4_esp_dev.resource[0].start = sun4_esp_physaddr; - sun4_esp_dev.resource[0].end = - sun4_esp_physaddr + ESP_REG_SIZE - 1; - sun4_esp_dev.resource[0].flags = IORESOURCE_IO; - - return detect_one_esp(tpnt, NULL, - &sun4_esp_dev, NULL, NULL, 0); - } - return 0; -} - -static int __devexit esp_sun4_remove(void) -{ - struct of_device *dev = &sun4_esp_dev.ofdev; - struct esp *esp = dev_get_drvdata(&dev->dev); - - return esp_remove_common(esp); -} - -#else /* !CONFIG_SUN4 */ - -static int __devinit esp_sbus_probe(struct of_device *dev, const struct of_device_id *match) -{ - struct sbus_dev *sdev = to_sbus_device(&dev->dev); - struct device_node *dp = dev->node; - struct sbus_dev *dma_sdev = NULL; - int hme = 0; - - if (dp->parent && - (!strcmp(dp->parent->name, "espdma") || - !strcmp(dp->parent->name, "dma"))) - dma_sdev = sdev->parent; - else if (!strcmp(dp->name, "SUNW,fas")) { - dma_sdev = sdev; - hme = 1; - } - - return detect_one_esp(match->data, &dev->dev, - sdev, dma_sdev, sdev->bus, hme); -} - -static int __devexit esp_sbus_remove(struct of_device *dev) -{ - struct esp *esp = dev_get_drvdata(&dev->dev); - - return esp_remove_common(esp); -} - -#endif /* !CONFIG_SUN4 */ - -/* The info function will return whatever useful - * information the developer sees fit. If not provided, then - * the name field will be used instead. - */ -static const char *esp_info(struct Scsi_Host *host) -{ - struct esp *esp; - - esp = (struct esp *) host->hostdata; - switch (esp->erev) { - case esp100: - return "Sparc ESP100 (NCR53C90)"; - case esp100a: - return "Sparc ESP100A (NCR53C90A)"; - case esp236: - return "Sparc ESP236"; - case fas236: - return "Sparc ESP236-FAST"; - case fashme: - return "Sparc ESP366-HME"; - case fas100a: - return "Sparc ESP100A-FAST"; - default: - return "Bogon ESP revision"; - }; -} - -/* From Wolfgang Stanglmeier's NCR scsi driver. */ -struct info_str -{ - char *buffer; - int length; - int offset; - int pos; -}; - -static void copy_mem_info(struct info_str *info, char *data, int len) -{ - if (info->pos + len > info->length) - len = info->length - info->pos; - - if (info->pos + len < info->offset) { - info->pos += len; - return; - } - if (info->pos < info->offset) { - data += (info->offset - info->pos); - len -= (info->offset - info->pos); - } - - if (len > 0) { - memcpy(info->buffer + info->pos, data, len); - info->pos += len; - } -} - -static int copy_info(struct info_str *info, char *fmt, ...) -{ - va_list args; - char buf[81]; - int len; - - va_start(args, fmt); - len = vsprintf(buf, fmt, args); - va_end(args); - - copy_mem_info(info, buf, len); - return len; -} - -static int esp_host_info(struct esp *esp, char *ptr, off_t offset, int len) -{ - struct scsi_device *sdev; - struct info_str info; - int i; - - info.buffer = ptr; - info.length = len; - info.offset = offset; - info.pos = 0; - - copy_info(&info, "Sparc ESP Host Adapter:\n"); - copy_info(&info, "\tPROM node\t\t%08x\n", (unsigned int) esp->prom_node); - copy_info(&info, "\tPROM name\t\t%s\n", esp->prom_name); - copy_info(&info, "\tESP Model\t\t"); - switch (esp->erev) { - case esp100: - copy_info(&info, "ESP100\n"); - break; - case esp100a: - copy_info(&info, "ESP100A\n"); - break; - case esp236: - copy_info(&info, "ESP236\n"); - break; - case fas236: - copy_info(&info, "FAS236\n"); - break; - case fas100a: - copy_info(&info, "FAS100A\n"); - break; - case fast: - copy_info(&info, "FAST\n"); - break; - case fashme: - copy_info(&info, "Happy Meal FAS\n"); - break; - case espunknown: - default: - copy_info(&info, "Unknown!\n"); - break; - }; - copy_info(&info, "\tDMA Revision\t\t"); - switch (esp->dma->revision) { - case dvmarev0: - copy_info(&info, "Rev 0\n"); - break; - case dvmaesc1: - copy_info(&info, "ESC Rev 1\n"); - break; - case dvmarev1: - copy_info(&info, "Rev 1\n"); - break; - case dvmarev2: - copy_info(&info, "Rev 2\n"); - break; - case dvmarev3: - copy_info(&info, "Rev 3\n"); - break; - case dvmarevplus: - copy_info(&info, "Rev 1+\n"); - break; - case dvmahme: - copy_info(&info, "Rev HME/FAS\n"); - break; - default: - copy_info(&info, "Unknown!\n"); - break; - }; - copy_info(&info, "\tLive Targets\t\t[ "); - for (i = 0; i < 15; i++) { - if (esp->targets_present & (1 << i)) - copy_info(&info, "%d ", i); - } - copy_info(&info, "]\n\n"); - - /* Now describe the state of each existing target. */ - copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n"); - - shost_for_each_device(sdev, esp->ehost) { - struct esp_device *esp_dev = sdev->hostdata; - uint id = sdev->id; - - if (!(esp->targets_present & (1 << id))) - continue; - - copy_info(&info, "%d\t\t", id); - copy_info(&info, "%08lx\t", esp->config3[id]); - copy_info(&info, "[%02lx,%02lx]\t\t\t", - esp_dev->sync_max_offset, - esp_dev->sync_min_period); - copy_info(&info, "%s\t\t", - esp_dev->disconnect ? "yes" : "no"); - copy_info(&info, "%s\n", - (esp->config3[id] & ESP_CONFIG3_EWIDE) ? "yes" : "no"); - } - return info.pos > info.offset? info.pos - info.offset : 0; -} - -/* ESP proc filesystem code. */ -static int esp_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, - int length, int inout) -{ - struct esp *esp = (struct esp *) host->hostdata; - - if (inout) - return -EINVAL; /* not yet */ - - if (start) - *start = buffer; - - return esp_host_info(esp, buffer, offset, length); -} - -static void esp_get_dmabufs(struct esp *esp, struct scsi_cmnd *sp) -{ - if (sp->use_sg == 0) { - sp->SCp.this_residual = sp->request_bufflen; - sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; - sp->SCp.buffers_residual = 0; - if (sp->request_bufflen) { - sp->SCp.have_data_in = sbus_map_single(esp->sdev, sp->SCp.buffer, - sp->SCp.this_residual, - sp->sc_data_direction); - sp->SCp.ptr = (char *) ((unsigned long)sp->SCp.have_data_in); - } else { - sp->SCp.ptr = NULL; - } - } else { - sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; - sp->SCp.buffers_residual = sbus_map_sg(esp->sdev, - sp->SCp.buffer, - sp->use_sg, - sp->sc_data_direction); - sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer); - sp->SCp.ptr = (char *) ((unsigned long)sg_dma_address(sp->SCp.buffer)); - } -} - -static void esp_release_dmabufs(struct esp *esp, struct scsi_cmnd *sp) -{ - if (sp->use_sg) { - sbus_unmap_sg(esp->sdev, sp->request_buffer, sp->use_sg, - sp->sc_data_direction); - } else if (sp->request_bufflen) { - sbus_unmap_single(esp->sdev, - sp->SCp.have_data_in, - sp->request_bufflen, - sp->sc_data_direction); - } -} - -static void esp_restore_pointers(struct esp *esp, struct scsi_cmnd *sp) -{ - struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; - - sp->SCp.ptr = ep->saved_ptr; - sp->SCp.buffer = ep->saved_buffer; - sp->SCp.this_residual = ep->saved_this_residual; - sp->SCp.buffers_residual = ep->saved_buffers_residual; -} - -static void esp_save_pointers(struct esp *esp, struct scsi_cmnd *sp) -{ - struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; - - ep->saved_ptr = sp->SCp.ptr; - ep->saved_buffer = sp->SCp.buffer; - ep->saved_this_residual = sp->SCp.this_residual; - ep->saved_buffers_residual = sp->SCp.buffers_residual; -} - -/* Some rules: - * - * 1) Never ever panic while something is live on the bus. - * If there is to be any chance of syncing the disks this - * rule is to be obeyed. - * - * 2) Any target that causes a foul condition will no longer - * have synchronous transfers done to it, no questions - * asked. - * - * 3) Keep register accesses to a minimum. Think about some - * day when we have Xbus machines this is running on and - * the ESP chip is on the other end of the machine on a - * different board from the cpu where this is running. - */ - -/* Fire off a command. We assume the bus is free and that the only - * case where we could see an interrupt is where we have disconnected - * commands active and they are trying to reselect us. - */ -static inline void esp_check_cmd(struct esp *esp, struct scsi_cmnd *sp) -{ - switch (sp->cmd_len) { - case 6: - case 10: - case 12: - esp->esp_slowcmd = 0; - break; - - default: - esp->esp_slowcmd = 1; - esp->esp_scmdleft = sp->cmd_len; - esp->esp_scmdp = &sp->cmnd[0]; - break; - }; -} - -static inline void build_sync_nego_msg(struct esp *esp, int period, int offset) -{ - esp->cur_msgout[0] = EXTENDED_MESSAGE; - esp->cur_msgout[1] = 3; - esp->cur_msgout[2] = EXTENDED_SDTR; - esp->cur_msgout[3] = period; - esp->cur_msgout[4] = offset; - esp->msgout_len = 5; -} - -/* SIZE is in bits, currently HME only supports 16 bit wide transfers. */ -static inline void build_wide_nego_msg(struct esp *esp, int size) -{ - esp->cur_msgout[0] = EXTENDED_MESSAGE; - esp->cur_msgout[1] = 2; - esp->cur_msgout[2] = EXTENDED_WDTR; - switch (size) { - case 32: - esp->cur_msgout[3] = 2; - break; - case 16: - esp->cur_msgout[3] = 1; - break; - case 8: - default: - esp->cur_msgout[3] = 0; - break; - }; - - esp->msgout_len = 4; -} - -static void esp_exec_cmd(struct esp *esp) -{ - struct scsi_cmnd *SCptr; - struct scsi_device *SDptr; - struct esp_device *esp_dev; - volatile u8 *cmdp = esp->esp_command; - u8 the_esp_command; - int lun, target; - int i; - - /* Hold off if we have disconnected commands and - * an IRQ is showing... - */ - if (esp->disconnected_SC && ESP_IRQ_P(esp->dregs)) - return; - - /* Grab first member of the issue queue. */ - SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); - - /* Safe to panic here because current_SC is null. */ - if (!SCptr) - panic("esp: esp_exec_cmd and issue queue is NULL"); - - SDptr = SCptr->device; - esp_dev = SDptr->hostdata; - lun = SCptr->device->lun; - target = SCptr->device->id; - - esp->snip = 0; - esp->msgout_len = 0; - - /* Send it out whole, or piece by piece? The ESP - * only knows how to automatically send out 6, 10, - * and 12 byte commands. I used to think that the - * Linux SCSI code would never throw anything other - * than that to us, but then again there is the - * SCSI generic driver which can send us anything. - */ - esp_check_cmd(esp, SCptr); - - /* If arbitration/selection is successful, the ESP will leave - * ATN asserted, causing the target to go into message out - * phase. The ESP will feed the target the identify and then - * the target can only legally go to one of command, - * datain/out, status, or message in phase, or stay in message - * out phase (should we be trying to send a sync negotiation - * message after the identify). It is not allowed to drop - * BSY, but some buggy targets do and we check for this - * condition in the selection complete code. Most of the time - * we'll make the command bytes available to the ESP and it - * will not interrupt us until it finishes command phase, we - * cannot do this for command sizes the ESP does not - * understand and in this case we'll get interrupted right - * when the target goes into command phase. - * - * It is absolutely _illegal_ in the presence of SCSI-2 devices - * to use the ESP select w/o ATN command. When SCSI-2 devices are - * present on the bus we _must_ always go straight to message out - * phase with an identify message for the target. Being that - * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 - * selections should not confuse SCSI-1 we hope. - */ - - if (esp_dev->sync) { - /* this targets sync is known */ -#ifndef __sparc_v9__ -do_sync_known: -#endif - if (esp_dev->disconnect) - *cmdp++ = IDENTIFY(1, lun); - else - *cmdp++ = IDENTIFY(0, lun); - - if (esp->esp_slowcmd) { - the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); - esp_advance_phase(SCptr, in_slct_stop); - } else { - the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); - esp_advance_phase(SCptr, in_slct_norm); - } - } else if (!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) { - /* After the bootup SCSI code sends both the - * TEST_UNIT_READY and INQUIRY commands we want - * to at least attempt allowing the device to - * disconnect. - */ - ESPMISC(("esp: Selecting device for first time. target=%d " - "lun=%d\n", target, SCptr->device->lun)); - if (!SDptr->borken && !esp_dev->disconnect) - esp_dev->disconnect = 1; - - *cmdp++ = IDENTIFY(0, lun); - esp->prevmsgout = NOP; - esp_advance_phase(SCptr, in_slct_norm); - the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); - - /* Take no chances... */ - esp_dev->sync_max_offset = 0; - esp_dev->sync_min_period = 0; - } else { - /* Sorry, I have had way too many problems with - * various CDROM devices on ESP. -DaveM - */ - int cdrom_hwbug_wkaround = 0; - -#ifndef __sparc_v9__ - /* Never allow disconnects or synchronous transfers on - * SparcStation1 and SparcStation1+. Allowing those - * to be enabled seems to lockup the machine completely. - */ - if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || - (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { - /* But we are nice and allow tapes and removable - * disks (but not CDROMs) to disconnect. - */ - if(SDptr->type == TYPE_TAPE || - (SDptr->type != TYPE_ROM && SDptr->removable)) - esp_dev->disconnect = 1; - else - esp_dev->disconnect = 0; - esp_dev->sync_max_offset = 0; - esp_dev->sync_min_period = 0; - esp_dev->sync = 1; - esp->snip = 0; - goto do_sync_known; - } -#endif /* !(__sparc_v9__) */ - - /* We've talked to this guy before, - * but never negotiated. Let's try, - * need to attempt WIDE first, before - * sync nego, as per SCSI 2 standard. - */ - if (esp->erev == fashme && !esp_dev->wide) { - if (!SDptr->borken && - SDptr->type != TYPE_ROM && - SDptr->removable == 0) { - build_wide_nego_msg(esp, 16); - esp_dev->wide = 1; - esp->wnip = 1; - goto after_nego_msg_built; - } else { - esp_dev->wide = 1; - /* Fall through and try sync. */ - } - } - - if (!SDptr->borken) { - if ((SDptr->type == TYPE_ROM)) { - /* Nice try sucker... */ - ESPMISC(("esp%d: Disabling sync for buggy " - "CDROM.\n", esp->esp_id)); - cdrom_hwbug_wkaround = 1; - build_sync_nego_msg(esp, 0, 0); - } else if (SDptr->removable != 0) { - ESPMISC(("esp%d: Not negotiating sync/wide but " - "allowing disconnect for removable media.\n", - esp->esp_id)); - build_sync_nego_msg(esp, 0, 0); - } else { - build_sync_nego_msg(esp, esp->sync_defp, 15); - } - } else { - build_sync_nego_msg(esp, 0, 0); - } - esp_dev->sync = 1; - esp->snip = 1; - -after_nego_msg_built: - /* A fix for broken SCSI1 targets, when they disconnect - * they lock up the bus and confuse ESP. So disallow - * disconnects for SCSI1 targets for now until we - * find a better fix. - * - * Addendum: This is funny, I figured out what was going - * on. The blotzed SCSI1 target would disconnect, - * one of the other SCSI2 targets or both would be - * disconnected as well. The SCSI1 target would - * stay disconnected long enough that we start - * up a command on one of the SCSI2 targets. As - * the ESP is arbitrating for the bus the SCSI1 - * target begins to arbitrate as well to reselect - * the ESP. The SCSI1 target refuses to drop it's - * ID bit on the data bus even though the ESP is - * at ID 7 and is the obvious winner for any - * arbitration. The ESP is a poor sport and refuses - * to lose arbitration, it will continue indefinitely - * trying to arbitrate for the bus and can only be - * stopped via a chip reset or SCSI bus reset. - * Therefore _no_ disconnects for SCSI1 targets - * thank you very much. ;-) - */ - if(((SDptr->scsi_level < 3) && - (SDptr->type != TYPE_TAPE) && - SDptr->removable == 0) || - cdrom_hwbug_wkaround || SDptr->borken) { - ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d " - "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); - esp_dev->disconnect = 0; - *cmdp++ = IDENTIFY(0, lun); - } else { - *cmdp++ = IDENTIFY(1, lun); - } - - /* ESP fifo is only so big... - * Make this look like a slow command. - */ - esp->esp_slowcmd = 1; - esp->esp_scmdleft = SCptr->cmd_len; - esp->esp_scmdp = &SCptr->cmnd[0]; - - the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); - esp_advance_phase(SCptr, in_slct_msg); - } - - if (!esp->esp_slowcmd) - for (i = 0; i < SCptr->cmd_len; i++) - *cmdp++ = SCptr->cmnd[i]; - - /* HME sucks... */ - if (esp->erev == fashme) - sbus_writeb((target & 0xf) | (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT), - esp->eregs + ESP_BUSID); - else - sbus_writeb(target & 7, esp->eregs + ESP_BUSID); - if (esp->prev_soff != esp_dev->sync_max_offset || - esp->prev_stp != esp_dev->sync_min_period || - (esp->erev > esp100a && - esp->prev_cfg3 != esp->config3[target])) { - esp->prev_soff = esp_dev->sync_max_offset; - esp->prev_stp = esp_dev->sync_min_period; - sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF); - sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP); - if (esp->erev > esp100a) { - esp->prev_cfg3 = esp->config3[target]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - } - } - i = (cmdp - esp->esp_command); - - if (esp->erev == fashme) { - esp_cmd(esp, ESP_CMD_FLUSH); /* Grrr! */ - - /* Set up the DMA and HME counters */ - sbus_writeb(i, esp->eregs + ESP_TCLOW); - sbus_writeb(0, esp->eregs + ESP_TCMED); - sbus_writeb(0, esp->eregs + FAS_RLO); - sbus_writeb(0, esp->eregs + FAS_RHI); - esp_cmd(esp, the_esp_command); - - /* Talk about touchy hardware... */ - esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr | - (DMA_SCSI_DISAB | DMA_ENABLE)) & - ~(DMA_ST_WRITE)); - sbus_writel(16, esp->dregs + DMA_COUNT); - sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR); - sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR); - } else { - u32 tmp; - - /* Set up the DMA and ESP counters */ - sbus_writeb(i, esp->eregs + ESP_TCLOW); - sbus_writeb(0, esp->eregs + ESP_TCMED); - tmp = sbus_readl(esp->dregs + DMA_CSR); - tmp &= ~DMA_ST_WRITE; - tmp |= DMA_ENABLE; - sbus_writel(tmp, esp->dregs + DMA_CSR); - if (esp->dma->revision == dvmaesc1) { - if (i) /* Workaround ESC gate array SBUS rerun bug. */ - sbus_writel(PAGE_SIZE, esp->dregs + DMA_COUNT); - } - sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR); - - /* Tell ESP to "go". */ - esp_cmd(esp, the_esp_command); - } -} - -/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ -static int esp_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) -{ - struct esp *esp; - - /* Set up func ptr and initial driver cmd-phase. */ - SCpnt->scsi_done = done; - SCpnt->SCp.phase = not_issued; - - /* We use the scratch area. */ - ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->device->lun)); - ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->device->lun)); - - esp = (struct esp *) SCpnt->device->host->hostdata; - esp_get_dmabufs(esp, SCpnt); - esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */ - - SCpnt->SCp.Status = CHECK_CONDITION; - SCpnt->SCp.Message = 0xff; - SCpnt->SCp.sent_command = 0; - - /* Place into our queue. */ - if (SCpnt->cmnd[0] == REQUEST_SENSE) { - ESPQUEUE(("RQSENSE\n")); - prepend_SC(&esp->issue_SC, SCpnt); - } else { - ESPQUEUE(("\n")); - append_SC(&esp->issue_SC, SCpnt); - } - - /* Run it now if we can. */ - if (!esp->current_SC && !esp->resetting_bus) - esp_exec_cmd(esp); - - return 0; -} - -/* Dump driver state. */ -static void esp_dump_cmd(struct scsi_cmnd *SCptr) -{ - ESPLOG(("[tgt<%02x> lun<%02x> " - "pphase<%s> cphase<%s>]", - SCptr->device->id, SCptr->device->lun, - phase_string(SCptr->SCp.sent_command), - phase_string(SCptr->SCp.phase))); -} - -static void esp_dump_state(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; -#ifdef DEBUG_ESP_CMDS - int i; -#endif - - ESPLOG(("esp%d: dumping state\n", esp->esp_id)); - ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n", - esp->esp_id, - sbus_readl(esp->dregs + DMA_CSR), - sbus_readl(esp->dregs + DMA_ADDR))); - ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", - esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); - ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", - esp->esp_id, - sbus_readb(esp->eregs + ESP_STATUS), - sbus_readb(esp->eregs + ESP_SSTEP), - sbus_readb(esp->eregs + ESP_INTRPT))); -#ifdef DEBUG_ESP_CMDS - printk("esp%d: last ESP cmds [", esp->esp_id); - i = (esp->espcmdent - 1) & 31; - printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); - i = (i - 1) & 31; - printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); - i = (i - 1) & 31; - printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); - i = (i - 1) & 31; - printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); - printk("]\n"); -#endif /* (DEBUG_ESP_CMDS) */ - - if (SCptr) { - ESPLOG(("esp%d: current command ", esp->esp_id)); - esp_dump_cmd(SCptr); - } - ESPLOG(("\n")); - SCptr = esp->disconnected_SC; - ESPLOG(("esp%d: disconnected ", esp->esp_id)); - while (SCptr) { - esp_dump_cmd(SCptr); - SCptr = (struct scsi_cmnd *) SCptr->host_scribble; - } - ESPLOG(("\n")); -} - -/* Abort a command. The host_lock is acquired by caller. */ -static int esp_abort(struct scsi_cmnd *SCptr) -{ - struct esp *esp = (struct esp *) SCptr->device->host->hostdata; - int don; - - ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); - esp_dump_state(esp); - - /* Wheee, if this is the current command on the bus, the - * best we can do is assert ATN and wait for msgout phase. - * This should even fix a hung SCSI bus when we lose state - * in the driver and timeout because the eventual phase change - * will cause the ESP to (eventually) give an interrupt. - */ - if (esp->current_SC == SCptr) { - esp->cur_msgout[0] = ABORT; - esp->msgout_len = 1; - esp->msgout_ctr = 0; - esp_cmd(esp, ESP_CMD_SATN); - return SUCCESS; - } - - /* If it is still in the issue queue then we can safely - * call the completion routine and report abort success. - */ - don = (sbus_readl(esp->dregs + DMA_CSR) & DMA_INT_ENAB); - if (don) { - ESP_INTSOFF(esp->dregs); - } - if (esp->issue_SC) { - struct scsi_cmnd **prev, *this; - for (prev = (&esp->issue_SC), this = esp->issue_SC; - this != NULL; - prev = (struct scsi_cmnd **) &(this->host_scribble), - this = (struct scsi_cmnd *) this->host_scribble) { - - if (this == SCptr) { - *prev = (struct scsi_cmnd *) this->host_scribble; - this->host_scribble = NULL; - - esp_release_dmabufs(esp, this); - this->result = DID_ABORT << 16; - this->scsi_done(this); - - if (don) - ESP_INTSON(esp->dregs); - - return SUCCESS; - } - } - } - - /* Yuck, the command to abort is disconnected, it is not - * worth trying to abort it now if something else is live - * on the bus at this time. So, we let the SCSI code wait - * a little bit and try again later. - */ - if (esp->current_SC) { - if (don) - ESP_INTSON(esp->dregs); - return FAILED; - } - - /* It's disconnected, we have to reconnect to re-establish - * the nexus and tell the device to abort. However, we really - * cannot 'reconnect' per se. Don't try to be fancy, just - * indicate failure, which causes our caller to reset the whole - * bus. - */ - - if (don) - ESP_INTSON(esp->dregs); - - return FAILED; -} - -/* We've sent ESP_CMD_RS to the ESP, the interrupt had just - * arrived indicating the end of the SCSI bus reset. Our job - * is to clean out the command queues and begin re-execution - * of SCSI commands once more. - */ -static int esp_finish_reset(struct esp *esp) -{ - struct scsi_cmnd *sp = esp->current_SC; - - /* Clean up currently executing command, if any. */ - if (sp != NULL) { - esp->current_SC = NULL; - - esp_release_dmabufs(esp, sp); - sp->result = (DID_RESET << 16); - - sp->scsi_done(sp); - } - - /* Clean up disconnected queue, they have been invalidated - * by the bus reset. - */ - if (esp->disconnected_SC) { - while ((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) { - esp_release_dmabufs(esp, sp); - sp->result = (DID_RESET << 16); - - sp->scsi_done(sp); - } - } - - /* SCSI bus reset is complete. */ - esp->resetting_bus = 0; - wake_up(&esp->reset_queue); - - /* Ok, now it is safe to get commands going once more. */ - if (esp->issue_SC) - esp_exec_cmd(esp); - - return do_intr_end; -} - -static int esp_do_resetbus(struct esp *esp) -{ - ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); - esp->resetting_bus = 1; - esp_cmd(esp, ESP_CMD_RS); - - return do_intr_end; -} - -/* Reset ESP chip, reset hanging bus, then kill active and - * disconnected commands for targets without soft reset. - * - * The host_lock is acquired by caller. - */ -static int esp_reset(struct scsi_cmnd *SCptr) -{ - struct esp *esp = (struct esp *) SCptr->device->host->hostdata; - - spin_lock_irq(esp->ehost->host_lock); - (void) esp_do_resetbus(esp); - spin_unlock_irq(esp->ehost->host_lock); - - wait_event(esp->reset_queue, (esp->resetting_bus == 0)); - - return SUCCESS; -} - -/* Internal ESP done function. */ -static void esp_done(struct esp *esp, int error) -{ - struct scsi_cmnd *done_SC = esp->current_SC; - - esp->current_SC = NULL; - - esp_release_dmabufs(esp, done_SC); - done_SC->result = error; - - done_SC->scsi_done(done_SC); - - /* Bus is free, issue any commands in the queue. */ - if (esp->issue_SC && !esp->current_SC) - esp_exec_cmd(esp); - -} - -/* Wheee, ESP interrupt engine. */ - -/* Forward declarations. */ -static int esp_do_phase_determine(struct esp *esp); -static int esp_do_data_finale(struct esp *esp); -static int esp_select_complete(struct esp *esp); -static int esp_do_status(struct esp *esp); -static int esp_do_msgin(struct esp *esp); -static int esp_do_msgindone(struct esp *esp); -static int esp_do_msgout(struct esp *esp); -static int esp_do_cmdbegin(struct esp *esp); - -#define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP) -#define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP) - -/* Read any bytes found in the FAS366 fifo, storing them into - * the ESP driver software state structure. - */ -static void hme_fifo_read(struct esp *esp) -{ - u8 count = 0; - u8 status = esp->sreg; - - /* Cannot safely frob the fifo for these following cases, but - * we must always read the fifo when the reselect interrupt - * is pending. - */ - if (((esp->ireg & ESP_INTR_RSEL) == 0) && - (sreg_datainp(status) || - sreg_dataoutp(status) || - (esp->current_SC && - esp->current_SC->SCp.phase == in_data_done))) { - ESPHME(("<wkaround_skipped>")); - } else { - unsigned long fcnt = sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES; - - /* The HME stores bytes in multiples of 2 in the fifo. */ - ESPHME(("hme_fifo[fcnt=%d", (int)fcnt)); - while (fcnt) { - esp->hme_fifo_workaround_buffer[count++] = - sbus_readb(esp->eregs + ESP_FDATA); - esp->hme_fifo_workaround_buffer[count++] = - sbus_readb(esp->eregs + ESP_FDATA); - ESPHME(("<%02x,%02x>", esp->hme_fifo_workaround_buffer[count-2], esp->hme_fifo_workaround_buffer[count-1])); - fcnt--; - } - if (sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_F1BYTE) { - ESPHME(("<poke_byte>")); - sbus_writeb(0, esp->eregs + ESP_FDATA); - esp->hme_fifo_workaround_buffer[count++] = - sbus_readb(esp->eregs + ESP_FDATA); - ESPHME(("<%02x,0x00>", esp->hme_fifo_workaround_buffer[count-1])); - ESPHME(("CMD_FLUSH")); - esp_cmd(esp, ESP_CMD_FLUSH); - } else { - ESPHME(("no_xtra_byte")); - } - } - ESPHME(("wkarnd_cnt=%d]", (int)count)); - esp->hme_fifo_workaround_count = count; -} - -static inline void hme_fifo_push(struct esp *esp, u8 *bytes, u8 count) -{ - esp_cmd(esp, ESP_CMD_FLUSH); - while (count) { - u8 tmp = *bytes++; - sbus_writeb(tmp, esp->eregs + ESP_FDATA); - sbus_writeb(0, esp->eregs + ESP_FDATA); - count--; - } -} - -/* We try to avoid some interrupts by jumping ahead and see if the ESP - * has gotten far enough yet. Hence the following. - */ -static inline int skipahead1(struct esp *esp, struct scsi_cmnd *scp, - int prev_phase, int new_phase) -{ - if (scp->SCp.sent_command != prev_phase) - return 0; - if (ESP_IRQ_P(esp->dregs)) { - /* Yes, we are able to save an interrupt. */ - if (esp->erev == fashme) - esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2); - esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR)); - esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); - if (esp->erev == fashme) { - /* This chip is really losing. */ - ESPHME(("HME[")); - /* Must latch fifo before reading the interrupt - * register else garbage ends up in the FIFO - * which confuses the driver utterly. - * Happy Meal indeed.... - */ - ESPHME(("fifo_workaround]")); - if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || - (esp->sreg2 & ESP_STAT2_F1BYTE)) - hme_fifo_read(esp); - } - if (!(esp->ireg & ESP_INTR_SR)) - return 0; - else - return do_reset_complete; - } - /* Ho hum, target is taking forever... */ - scp->SCp.sent_command = new_phase; /* so we don't recurse... */ - return do_intr_end; -} - -static inline int skipahead2(struct esp *esp, struct scsi_cmnd *scp, - int prev_phase1, int prev_phase2, int new_phase) -{ - if (scp->SCp.sent_command != prev_phase1 && - scp->SCp.sent_command != prev_phase2) - return 0; - if (ESP_IRQ_P(esp->dregs)) { - /* Yes, we are able to save an interrupt. */ - if (esp->erev == fashme) - esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2); - esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR)); - esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); - if (esp->erev == fashme) { - /* This chip is really losing. */ - ESPHME(("HME[")); - - /* Must latch fifo before reading the interrupt - * register else garbage ends up in the FIFO - * which confuses the driver utterly. - * Happy Meal indeed.... - */ - ESPHME(("fifo_workaround]")); - if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || - (esp->sreg2 & ESP_STAT2_F1BYTE)) - hme_fifo_read(esp); - } - if (!(esp->ireg & ESP_INTR_SR)) - return 0; - else - return do_reset_complete; - } - /* Ho hum, target is taking forever... */ - scp->SCp.sent_command = new_phase; /* so we don't recurse... */ - return do_intr_end; -} - -/* Now some dma helpers. */ -static void dma_setup(struct esp *esp, __u32 addr, int count, int write) -{ - u32 nreg = sbus_readl(esp->dregs + DMA_CSR); - - if (write) - nreg |= DMA_ST_WRITE; - else - nreg &= ~(DMA_ST_WRITE); - nreg |= DMA_ENABLE; - sbus_writel(nreg, esp->dregs + DMA_CSR); - if (esp->dma->revision == dvmaesc1) { - /* This ESC gate array sucks! */ - __u32 src = addr; - __u32 dest = src + count; - - if (dest & (PAGE_SIZE - 1)) - count = PAGE_ALIGN(count); - sbus_writel(count, esp->dregs + DMA_COUNT); - } - sbus_writel(addr, esp->dregs + DMA_ADDR); -} - -static void dma_drain(struct esp *esp) -{ - u32 tmp; - - if (esp->dma->revision == dvmahme) - return; - if ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_FIFO_ISDRAIN) { - switch (esp->dma->revision) { - default: - tmp |= DMA_FIFO_STDRAIN; - sbus_writel(tmp, esp->dregs + DMA_CSR); - - case dvmarev3: - case dvmaesc1: - while (sbus_readl(esp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN) - udelay(1); - }; - } -} - -static void dma_invalidate(struct esp *esp) -{ - u32 tmp; - - if (esp->dma->revision == dvmahme) { - sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR); - - esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr | - (DMA_PARITY_OFF | DMA_2CLKS | - DMA_SCSI_DISAB | DMA_INT_ENAB)) & - ~(DMA_ST_WRITE | DMA_ENABLE)); - - sbus_writel(0, esp->dregs + DMA_CSR); - sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR); - - /* This is necessary to avoid having the SCSI channel - * engine lock up on us. - */ - sbus_writel(0, esp->dregs + DMA_ADDR); - } else { - while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ) - udelay(1); - - tmp &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB); - tmp |= DMA_FIFO_INV; - sbus_writel(tmp, esp->dregs + DMA_CSR); - tmp &= ~DMA_FIFO_INV; - sbus_writel(tmp, esp->dregs + DMA_CSR); - } -} - -static inline void dma_flashclear(struct esp *esp) -{ - dma_drain(esp); - dma_invalidate(esp); -} - -static int dma_can_transfer(struct esp *esp, struct scsi_cmnd *sp) -{ - __u32 base, end, sz; - - if (esp->dma->revision == dvmarev3) { - sz = sp->SCp.this_residual; - if (sz > 0x1000000) - sz = 0x1000000; - } else { - base = ((__u32)((unsigned long)sp->SCp.ptr)); - base &= (0x1000000 - 1); - end = (base + sp->SCp.this_residual); - if (end > 0x1000000) - end = 0x1000000; - sz = (end - base); - } - return sz; -} - -/* Misc. esp helper macros. */ -#define esp_setcount(__eregs, __cnt, __hme) \ - sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \ - sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \ - if (__hme) { \ - sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \ - sbus_writeb(0, (__eregs) + FAS_RHI); \ - } - -#define esp_getcount(__eregs, __hme) \ - ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \ - ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \ - ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0)) - -#define fcount(__esp) \ - (((__esp)->erev == fashme) ? \ - (__esp)->hme_fifo_workaround_count : \ - sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES) - -#define fnzero(__esp) \ - (((__esp)->erev == fashme) ? 0 : \ - sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO) - -/* XXX speculative nops unnecessary when continuing amidst a data phase - * XXX even on esp100!!! another case of flooding the bus with I/O reg - * XXX writes... - */ -#define esp_maybe_nop(__esp) \ - if ((__esp)->erev == esp100) \ - esp_cmd((__esp), ESP_CMD_NULL) - -#define sreg_to_dataphase(__sreg) \ - ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain) - -/* The ESP100 when in synchronous data phase, can mistake a long final - * REQ pulse from the target as an extra byte, it places whatever is on - * the data lines into the fifo. For now, we will assume when this - * happens that the target is a bit quirky and we don't want to - * be talking synchronously to it anyways. Regardless, we need to - * tell the ESP to eat the extraneous byte so that we can proceed - * to the next phase. - */ -static int esp100_sync_hwbug(struct esp *esp, struct scsi_cmnd *sp, int fifocnt) -{ - /* Do not touch this piece of code. */ - if ((!(esp->erev == esp100)) || - (!(sreg_datainp((esp->sreg = sbus_readb(esp->eregs + ESP_STATUS))) && - !fifocnt) && - !(sreg_dataoutp(esp->sreg) && !fnzero(esp)))) { - if (sp->SCp.phase == in_dataout) - esp_cmd(esp, ESP_CMD_FLUSH); - return 0; - } else { - /* Async mode for this guy. */ - build_sync_nego_msg(esp, 0, 0); - - /* Ack the bogus byte, but set ATN first. */ - esp_cmd(esp, ESP_CMD_SATN); - esp_cmd(esp, ESP_CMD_MOK); - return 1; - } -} - -/* This closes the window during a selection with a reselect pending, because - * we use DMA for the selection process the FIFO should hold the correct - * contents if we get reselected during this process. So we just need to - * ack the possible illegal cmd interrupt pending on the esp100. - */ -static inline int esp100_reconnect_hwbug(struct esp *esp) -{ - u8 tmp; - - if (esp->erev != esp100) - return 0; - tmp = sbus_readb(esp->eregs + ESP_INTRPT); - if (tmp & ESP_INTR_SR) - return 1; - return 0; -} - -/* This verifies the BUSID bits during a reselection so that we know which - * target is talking to us. - */ -static inline int reconnect_target(struct esp *esp) -{ - int it, me = esp->scsi_id_mask, targ = 0; - - if (2 != fcount(esp)) - return -1; - if (esp->erev == fashme) { - /* HME does not latch it's own BUS ID bits during - * a reselection. Also the target number is given - * as an unsigned char, not as a sole bit number - * like the other ESP's do. - * Happy Meal indeed.... - */ - targ = esp->hme_fifo_workaround_buffer[0]; - } else { - it = sbus_readb(esp->eregs + ESP_FDATA); - if (!(it & me)) - return -1; - it &= ~me; - if (it & (it - 1)) - return -1; - while (!(it & 1)) - targ++, it >>= 1; - } - return targ; -} - -/* This verifies the identify from the target so that we know which lun is - * being reconnected. - */ -static inline int reconnect_lun(struct esp *esp) -{ - int lun; - - if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) - return -1; - if (esp->erev == fashme) - lun = esp->hme_fifo_workaround_buffer[1]; - else - lun = sbus_readb(esp->eregs + ESP_FDATA); - - /* Yes, you read this correctly. We report lun of zero - * if we see parity error. ESP reports parity error for - * the lun byte, and this is the only way to hope to recover - * because the target is connected. - */ - if (esp->sreg & ESP_STAT_PERR) - return 0; - - /* Check for illegal bits being set in the lun. */ - if ((lun & 0x40) || !(lun & 0x80)) - return -1; - - return lun & 7; -} - -/* This puts the driver in a state where it can revitalize a command that - * is being continued due to reselection. - */ -static inline void esp_connect(struct esp *esp, struct scsi_cmnd *sp) -{ - struct esp_device *esp_dev = sp->device->hostdata; - - if (esp->prev_soff != esp_dev->sync_max_offset || - esp->prev_stp != esp_dev->sync_min_period || - (esp->erev > esp100a && - esp->prev_cfg3 != esp->config3[sp->device->id])) { - esp->prev_soff = esp_dev->sync_max_offset; - esp->prev_stp = esp_dev->sync_min_period; - sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF); - sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP); - if (esp->erev > esp100a) { - esp->prev_cfg3 = esp->config3[sp->device->id]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - } - } - esp->current_SC = sp; -} - -/* This will place the current working command back into the issue queue - * if we are to receive a reselection amidst a selection attempt. - */ -static inline void esp_reconnect(struct esp *esp, struct scsi_cmnd *sp) -{ - if (!esp->disconnected_SC) - ESPLOG(("esp%d: Weird, being reselected but disconnected " - "command queue is empty.\n", esp->esp_id)); - esp->snip = 0; - esp->current_SC = NULL; - sp->SCp.phase = not_issued; - append_SC(&esp->issue_SC, sp); -} - -/* Begin message in phase. */ -static int esp_do_msgin(struct esp *esp) -{ - /* Must be very careful with the fifo on the HME */ - if ((esp->erev != fashme) || - !(sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_FEMPTY)) - esp_cmd(esp, ESP_CMD_FLUSH); - esp_maybe_nop(esp); - esp_cmd(esp, ESP_CMD_TI); - esp->msgin_len = 1; - esp->msgin_ctr = 0; - esp_advance_phase(esp->current_SC, in_msgindone); - return do_work_bus; -} - -/* This uses various DMA csr fields and the fifo flags count value to - * determine how many bytes were successfully sent/received by the ESP. - */ -static inline int esp_bytes_sent(struct esp *esp, int fifo_count) -{ - int rval = sbus_readl(esp->dregs + DMA_ADDR) - esp->esp_command_dvma; - - if (esp->dma->revision == dvmarev1) - rval -= (4 - ((sbus_readl(esp->dregs + DMA_CSR) & DMA_READ_AHEAD)>>11)); - return rval - fifo_count; -} - -static inline void advance_sg(struct scsi_cmnd *sp) -{ - ++sp->SCp.buffer; - --sp->SCp.buffers_residual; - sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer); - sp->SCp.ptr = (char *)((unsigned long)sg_dma_address(sp->SCp.buffer)); -} - -/* Please note that the way I've coded these routines is that I _always_ - * check for a disconnect during any and all information transfer - * phases. The SCSI standard states that the target _can_ cause a BUS - * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note - * that during information transfer phases the target controls every - * change in phase, the only thing the initiator can do is "ask" for - * a message out phase by driving ATN true. The target can, and sometimes - * will, completely ignore this request so we cannot assume anything when - * we try to force a message out phase to abort/reset a target. Most of - * the time the target will eventually be nice and go to message out, so - * we may have to hold on to our state about what we want to tell the target - * for some period of time. - */ - -/* I think I have things working here correctly. Even partial transfers - * within a buffer or sub-buffer should not upset us at all no matter - * how bad the target and/or ESP fucks things up. - */ -static int esp_do_data(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - int thisphase, hmuch; - - ESPDATA(("esp_do_data: ")); - esp_maybe_nop(esp); - thisphase = sreg_to_dataphase(esp->sreg); - esp_advance_phase(SCptr, thisphase); - ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); - hmuch = dma_can_transfer(esp, SCptr); - if (hmuch > (64 * 1024) && (esp->erev != fashme)) - hmuch = (64 * 1024); - ESPDATA(("hmuch<%d> ", hmuch)); - esp->current_transfer_size = hmuch; - - if (esp->erev == fashme) { - u32 tmp = esp->prev_hme_dmacsr; - - /* Always set the ESP count registers first. */ - esp_setcount(esp->eregs, hmuch, 1); - - /* Get the DMA csr computed. */ - tmp |= (DMA_SCSI_DISAB | DMA_ENABLE); - if (thisphase == in_datain) - tmp |= DMA_ST_WRITE; - else - tmp &= ~(DMA_ST_WRITE); - esp->prev_hme_dmacsr = tmp; - - ESPDATA(("DMA|TI --> do_intr_end\n")); - if (thisphase == in_datain) { - sbus_writel(hmuch, esp->dregs + DMA_COUNT); - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - } else { - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - sbus_writel(hmuch, esp->dregs + DMA_COUNT); - } - sbus_writel((__u32)((unsigned long)SCptr->SCp.ptr), esp->dregs+DMA_ADDR); - sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR); - } else { - esp_setcount(esp->eregs, hmuch, 0); - dma_setup(esp, ((__u32)((unsigned long)SCptr->SCp.ptr)), - hmuch, (thisphase == in_datain)); - ESPDATA(("DMA|TI --> do_intr_end\n")); - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - } - return do_intr_end; -} - -/* See how successful the data transfer was. */ -static int esp_do_data_finale(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - struct esp_device *esp_dev = SCptr->device->hostdata; - int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; - - ESPDATA(("esp_do_data_finale: ")); - - if (SCptr->SCp.phase == in_datain) { - if (esp->sreg & ESP_STAT_PERR) { - /* Yuck, parity error. The ESP asserts ATN - * so that we can go to message out phase - * immediately and inform the target that - * something bad happened. - */ - ESPLOG(("esp%d: data bad parity detected.\n", - esp->esp_id)); - esp->cur_msgout[0] = INITIATOR_ERROR; - esp->msgout_len = 1; - } - dma_drain(esp); - } - dma_invalidate(esp); - - /* This could happen for the above parity error case. */ - if (esp->ireg != ESP_INTR_BSERV) { - /* Please go to msgout phase, please please please... */ - ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", - esp->esp_id)); - return esp_do_phase_determine(esp); - } - - /* Check for partial transfers and other horrible events. - * Note, here we read the real fifo flags register even - * on HME broken adapters because we skip the HME fifo - * workaround code in esp_handle() if we are doing data - * phase things. We don't want to fuck directly with - * the fifo like that, especially if doing synchronous - * transfers! Also, will need to double the count on - * HME if we are doing wide transfers, as the HME fifo - * will move and count 16-bit quantities during wide data. - * SMCC _and_ Qlogic can both bite me. - */ - fifocnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES); - if (esp->erev != fashme) - ecount = esp_getcount(esp->eregs, 0); - bytes_sent = esp->current_transfer_size; - - ESPDATA(("trans_sz(%d), ", bytes_sent)); - if (esp->erev == fashme) { - if (!(esp->sreg & ESP_STAT_TCNT)) { - ecount = esp_getcount(esp->eregs, 1); - bytes_sent -= ecount; - } - - /* Always subtract any cruft remaining in the FIFO. */ - if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE) - fifocnt <<= 1; - if (SCptr->SCp.phase == in_dataout) - bytes_sent -= fifocnt; - - /* I have an IBM disk which exhibits the following - * behavior during writes to it. It disconnects in - * the middle of a partial transfer, the current sglist - * buffer is 1024 bytes, the disk stops data transfer - * at 512 bytes. - * - * However the FAS366 reports that 32 more bytes were - * transferred than really were. This is precisely - * the size of a fully loaded FIFO in wide scsi mode. - * The FIFO state recorded indicates that it is empty. - * - * I have no idea if this is a bug in the FAS366 chip - * or a bug in the firmware on this IBM disk. In any - * event the following seems to be a good workaround. -DaveM - */ - if (bytes_sent != esp->current_transfer_size && - SCptr->SCp.phase == in_dataout) { - int mask = (64 - 1); - - if ((esp->prev_cfg3 & ESP_CONFIG3_EWIDE) == 0) - mask >>= 1; - - if (bytes_sent & mask) - bytes_sent -= (bytes_sent & mask); - } - } else { - if (!(esp->sreg & ESP_STAT_TCNT)) - bytes_sent -= ecount; - if (SCptr->SCp.phase == in_dataout) - bytes_sent -= fifocnt; - } - - ESPDATA(("bytes_sent(%d), ", bytes_sent)); - - /* If we were in synchronous mode, check for peculiarities. */ - if (esp->erev == fashme) { - if (esp_dev->sync_max_offset) { - if (SCptr->SCp.phase == in_dataout) - esp_cmd(esp, ESP_CMD_FLUSH); - } else { - esp_cmd(esp, ESP_CMD_FLUSH); - } - } else { - if (esp_dev->sync_max_offset) - bogus_data = esp100_sync_hwbug(esp, SCptr, fifocnt); - else - esp_cmd(esp, ESP_CMD_FLUSH); - } - - /* Until we are sure of what has happened, we are certainly - * in the dark. - */ - esp_advance_phase(SCptr, in_the_dark); - - if (bytes_sent < 0) { - /* I've seen this happen due to lost state in this - * driver. No idea why it happened, but allowing - * this value to be negative caused things to - * lock up. This allows greater chance of recovery. - * In fact every time I've seen this, it has been - * a driver bug without question. - */ - ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); - ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", - esp->esp_id, - esp->current_transfer_size, fifocnt, ecount)); - ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", - esp->esp_id, - SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); - ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id, - SCptr->device->id)); - SCptr->device->borken = 1; - esp_dev->sync = 0; - bytes_sent = 0; - } - - /* Update the state of our transfer. */ - SCptr->SCp.ptr += bytes_sent; - SCptr->SCp.this_residual -= bytes_sent; - if (SCptr->SCp.this_residual < 0) { - /* shit */ - ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id)); - SCptr->SCp.this_residual = 0; - } - - /* Maybe continue. */ - if (!bogus_data) { - ESPDATA(("!bogus_data, ")); - - /* NO MATTER WHAT, we advance the scatterlist, - * if the target should decide to disconnect - * in between scatter chunks (which is common) - * we could die horribly! I used to have the sg - * advance occur only if we are going back into - * (or are staying in) a data phase, you can - * imagine the hell I went through trying to - * figure this out. - */ - if (SCptr->use_sg && !SCptr->SCp.this_residual) - advance_sg(SCptr); - if (sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { - ESPDATA(("to more data\n")); - return esp_do_data(esp); - } - ESPDATA(("to new phase\n")); - return esp_do_phase_determine(esp); - } - /* Bogus data, just wait for next interrupt. */ - ESPLOG(("esp%d: bogus_data during end of data phase\n", - esp->esp_id)); - return do_intr_end; -} - -/* We received a non-good status return at the end of - * running a SCSI command. This is used to decide if - * we should clear our synchronous transfer state for - * such a device when that happens. - * - * The idea is that when spinning up a disk or rewinding - * a tape, we don't want to go into a loop re-negotiating - * synchronous capabilities over and over. - */ -static int esp_should_clear_sync(struct scsi_cmnd *sp) -{ - u8 cmd = sp->cmnd[0]; - - /* These cases are for spinning up a disk and - * waiting for that spinup to complete. - */ - if (cmd == START_STOP) - return 0; - - if (cmd == TEST_UNIT_READY) - return 0; - - /* One more special case for SCSI tape drives, - * this is what is used to probe the device for - * completion of a rewind or tape load operation. - */ - if (sp->device->type == TYPE_TAPE) { - if (cmd == MODE_SENSE) - return 0; - } - - return 1; -} - -/* Either a command is completing or a target is dropping off the bus - * to continue the command in the background so we can do other work. - */ -static int esp_do_freebus(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - struct esp_device *esp_dev = SCptr->device->hostdata; - int rval; - - rval = skipahead2(esp, SCptr, in_status, in_msgindone, in_freeing); - if (rval) - return rval; - if (esp->ireg != ESP_INTR_DC) { - ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); - return do_reset_bus; /* target will not drop BSY... */ - } - esp->msgout_len = 0; - esp->prevmsgout = NOP; - if (esp->prevmsgin == COMMAND_COMPLETE) { - /* Normal end of nexus. */ - if (esp->disconnected_SC || (esp->erev == fashme)) - esp_cmd(esp, ESP_CMD_ESEL); - - if (SCptr->SCp.Status != GOOD && - SCptr->SCp.Status != CONDITION_GOOD && - ((1<<SCptr->device->id) & esp->targets_present) && - esp_dev->sync && - esp_dev->sync_max_offset) { - /* SCSI standard says that the synchronous capabilities - * should be renegotiated at this point. Most likely - * we are about to request sense from this target - * in which case we want to avoid using sync - * transfers until we are sure of the current target - * state. - */ - ESPMISC(("esp: Status <%d> for target %d lun %d\n", - SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun)); - - /* But don't do this when spinning up a disk at - * boot time while we poll for completion as it - * fills up the console with messages. Also, tapes - * can report not ready many times right after - * loading up a tape. - */ - if (esp_should_clear_sync(SCptr) != 0) - esp_dev->sync = 0; - } - ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); - esp_done(esp, ((SCptr->SCp.Status & 0xff) | - ((SCptr->SCp.Message & 0xff)<<8) | - (DID_OK << 16))); - } else if (esp->prevmsgin == DISCONNECT) { - /* Normal disconnect. */ - esp_cmd(esp, ESP_CMD_ESEL); - ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); - append_SC(&esp->disconnected_SC, SCptr); - esp->current_SC = NULL; - if (esp->issue_SC) - esp_exec_cmd(esp); - } else { - /* Driver bug, we do not expect a disconnect here - * and should not have advanced the state engine - * to in_freeing. - */ - ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", - esp->esp_id)); - return do_reset_bus; - } - return do_intr_end; -} - -/* When a reselect occurs, and we cannot find the command to - * reconnect to in our queues, we do this. - */ -static int esp_bad_reconnect(struct esp *esp) -{ - struct scsi_cmnd *sp; - - ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", - esp->esp_id)); - ESPLOG(("QUEUE DUMP\n")); - sp = esp->issue_SC; - ESPLOG(("esp%d: issue_SC[", esp->esp_id)); - while (sp) { - ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); - sp = (struct scsi_cmnd *) sp->host_scribble; - } - ESPLOG(("]\n")); - sp = esp->current_SC; - ESPLOG(("esp%d: current_SC[", esp->esp_id)); - if (sp) - ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); - else - ESPLOG(("<NULL>")); - ESPLOG(("]\n")); - sp = esp->disconnected_SC; - ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); - while (sp) { - ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); - sp = (struct scsi_cmnd *) sp->host_scribble; - } - ESPLOG(("]\n")); - return do_reset_bus; -} - -/* Do the needy when a target tries to reconnect to us. */ -static int esp_do_reconnect(struct esp *esp) -{ - int lun, target; - struct scsi_cmnd *SCptr; - - /* Check for all bogus conditions first. */ - target = reconnect_target(esp); - if (target < 0) { - ESPDISC(("bad bus bits\n")); - return do_reset_bus; - } - lun = reconnect_lun(esp); - if (lun < 0) { - ESPDISC(("target=%2x, bad identify msg\n", target)); - return do_reset_bus; - } - - /* Things look ok... */ - ESPDISC(("R<%02x,%02x>", target, lun)); - - /* Must not flush FIFO or DVMA on HME. */ - if (esp->erev != fashme) { - esp_cmd(esp, ESP_CMD_FLUSH); - if (esp100_reconnect_hwbug(esp)) - return do_reset_bus; - esp_cmd(esp, ESP_CMD_NULL); - } - - SCptr = remove_SC(&esp->disconnected_SC, (u8) target, (u8) lun); - if (!SCptr) - return esp_bad_reconnect(esp); - - esp_connect(esp, SCptr); - esp_cmd(esp, ESP_CMD_MOK); - - if (esp->erev == fashme) - sbus_writeb(((SCptr->device->id & 0xf) | - (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT)), - esp->eregs + ESP_BUSID); - - /* Reconnect implies a restore pointers operation. */ - esp_restore_pointers(esp, SCptr); - - esp->snip = 0; - esp_advance_phase(SCptr, in_the_dark); - return do_intr_end; -} - -/* End of NEXUS (hopefully), pick up status + message byte then leave if - * all goes well. - */ -static int esp_do_status(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - int intr, rval; - - rval = skipahead1(esp, SCptr, in_the_dark, in_status); - if (rval) - return rval; - intr = esp->ireg; - ESPSTAT(("esp_do_status: ")); - if (intr != ESP_INTR_DC) { - int message_out = 0; /* for parity problems */ - - /* Ack the message. */ - ESPSTAT(("ack msg, ")); - esp_cmd(esp, ESP_CMD_MOK); - - if (esp->erev != fashme) { - dma_flashclear(esp); - - /* Wait till the first bits settle. */ - while (esp->esp_command[0] == 0xff) - udelay(1); - } else { - esp->esp_command[0] = esp->hme_fifo_workaround_buffer[0]; - esp->esp_command[1] = esp->hme_fifo_workaround_buffer[1]; - } - - ESPSTAT(("got something, ")); - /* ESP chimes in with one of - * - * 1) function done interrupt: - * both status and message in bytes - * are available - * - * 2) bus service interrupt: - * only status byte was acquired - * - * 3) Anything else: - * can't happen, but we test for it - * anyways - * - * ALSO: If bad parity was detected on either - * the status _or_ the message byte then - * the ESP has asserted ATN on the bus - * and we must therefore wait for the - * next phase change. - */ - if (intr & ESP_INTR_FDONE) { - /* We got it all, hallejulia. */ - ESPSTAT(("got both, ")); - SCptr->SCp.Status = esp->esp_command[0]; - SCptr->SCp.Message = esp->esp_command[1]; - esp->prevmsgin = SCptr->SCp.Message; - esp->cur_msgin[0] = SCptr->SCp.Message; - if (esp->sreg & ESP_STAT_PERR) { - /* There was bad parity for the - * message byte, the status byte - * was ok. - */ - message_out = MSG_PARITY_ERROR; - } - } else if (intr == ESP_INTR_BSERV) { - /* Only got status byte. */ - ESPLOG(("esp%d: got status only, ", esp->esp_id)); - if (!(esp->sreg & ESP_STAT_PERR)) { - SCptr->SCp.Status = esp->esp_command[0]; - SCptr->SCp.Message = 0xff; - } else { - /* The status byte had bad parity. - * we leave the scsi_pointer Status - * field alone as we set it to a default - * of CHECK_CONDITION in esp_queue. - */ - message_out = INITIATOR_ERROR; - } - } else { - /* This shouldn't happen ever. */ - ESPSTAT(("got bolixed\n")); - esp_advance_phase(SCptr, in_the_dark); - return esp_do_phase_determine(esp); - } - - if (!message_out) { - ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, - SCptr->SCp.Message)); - if (SCptr->SCp.Message == COMMAND_COMPLETE) { - ESPSTAT(("and was COMMAND_COMPLETE\n")); - esp_advance_phase(SCptr, in_freeing); - return esp_do_freebus(esp); - } else { - ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", - esp->esp_id)); - esp->msgin_len = esp->msgin_ctr = 1; - esp_advance_phase(SCptr, in_msgindone); - return esp_do_msgindone(esp); - } - } else { - /* With luck we'll be able to let the target - * know that bad parity happened, it will know - * which byte caused the problems and send it - * again. For the case where the status byte - * receives bad parity, I do not believe most - * targets recover very well. We'll see. - */ - ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", - esp->esp_id, message_out)); - esp->cur_msgout[0] = message_out; - esp->msgout_len = esp->msgout_ctr = 1; - esp_advance_phase(SCptr, in_the_dark); - return esp_do_phase_determine(esp); - } - } else { - /* If we disconnect now, all hell breaks loose. */ - ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); - esp_advance_phase(SCptr, in_the_dark); - return esp_do_phase_determine(esp); - } -} - -static int esp_enter_status(struct esp *esp) -{ - u8 thecmd = ESP_CMD_ICCSEQ; - - esp_cmd(esp, ESP_CMD_FLUSH); - if (esp->erev != fashme) { - u32 tmp; - - esp->esp_command[0] = esp->esp_command[1] = 0xff; - sbus_writeb(2, esp->eregs + ESP_TCLOW); - sbus_writeb(0, esp->eregs + ESP_TCMED); - tmp = sbus_readl(esp->dregs + DMA_CSR); - tmp |= (DMA_ST_WRITE | DMA_ENABLE); - sbus_writel(tmp, esp->dregs + DMA_CSR); - if (esp->dma->revision == dvmaesc1) - sbus_writel(0x100, esp->dregs + DMA_COUNT); - sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR); - thecmd |= ESP_CMD_DMA; - } - esp_cmd(esp, thecmd); - esp_advance_phase(esp->current_SC, in_status); - - return esp_do_status(esp); -} - -static int esp_disconnect_amidst_phases(struct esp *esp) -{ - struct scsi_cmnd *sp = esp->current_SC; - struct esp_device *esp_dev = sp->device->hostdata; - - /* This means real problems if we see this - * here. Unless we were actually trying - * to force the device to abort/reset. - */ - ESPLOG(("esp%d Disconnect amidst phases, ", esp->esp_id)); - ESPLOG(("pphase<%s> cphase<%s>, ", - phase_string(sp->SCp.phase), - phase_string(sp->SCp.sent_command))); - - if (esp->disconnected_SC != NULL || (esp->erev == fashme)) - esp_cmd(esp, ESP_CMD_ESEL); - - switch (esp->cur_msgout[0]) { - default: - /* We didn't expect this to happen at all. */ - ESPLOG(("device is bolixed\n")); - esp_advance_phase(sp, in_tgterror); - esp_done(esp, (DID_ERROR << 16)); - break; - - case BUS_DEVICE_RESET: - ESPLOG(("device reset successful\n")); - esp_dev->sync_max_offset = 0; - esp_dev->sync_min_period = 0; - esp_dev->sync = 0; - esp_advance_phase(sp, in_resetdev); - esp_done(esp, (DID_RESET << 16)); - break; - - case ABORT: - ESPLOG(("device abort successful\n")); - esp_advance_phase(sp, in_abortone); - esp_done(esp, (DID_ABORT << 16)); - break; - - }; - return do_intr_end; -} - -static int esp_enter_msgout(struct esp *esp) -{ - esp_advance_phase(esp->current_SC, in_msgout); - return esp_do_msgout(esp); -} - -static int esp_enter_msgin(struct esp *esp) -{ - esp_advance_phase(esp->current_SC, in_msgin); - return esp_do_msgin(esp); -} - -static int esp_enter_cmd(struct esp *esp) -{ - esp_advance_phase(esp->current_SC, in_cmdbegin); - return esp_do_cmdbegin(esp); -} - -static int esp_enter_badphase(struct esp *esp) -{ - ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, - esp->sreg & ESP_STAT_PMASK)); - return do_reset_bus; -} - -typedef int (*espfunc_t)(struct esp *); - -static espfunc_t phase_vector[] = { - esp_do_data, /* ESP_DOP */ - esp_do_data, /* ESP_DIP */ - esp_enter_cmd, /* ESP_CMDP */ - esp_enter_status, /* ESP_STATP */ - esp_enter_badphase, /* ESP_STAT_PMSG */ - esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */ - esp_enter_msgout, /* ESP_MOP */ - esp_enter_msgin, /* ESP_MIP */ -}; - -/* The target has control of the bus and we have to see where it has - * taken us. - */ -static int esp_do_phase_determine(struct esp *esp) -{ - if ((esp->ireg & ESP_INTR_DC) != 0) - return esp_disconnect_amidst_phases(esp); - return phase_vector[esp->sreg & ESP_STAT_PMASK](esp); -} - -/* First interrupt after exec'ing a cmd comes here. */ -static int esp_select_complete(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - struct esp_device *esp_dev = SCptr->device->hostdata; - int cmd_bytes_sent, fcnt; - - if (esp->erev != fashme) - esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS); - - if (esp->erev == fashme) - fcnt = esp->hme_fifo_workaround_count; - else - fcnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES); - - cmd_bytes_sent = esp_bytes_sent(esp, fcnt); - dma_invalidate(esp); - - /* Let's check to see if a reselect happened - * while we we're trying to select. This must - * be checked first. - */ - if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { - esp_reconnect(esp, SCptr); - return esp_do_reconnect(esp); - } - - /* Looks like things worked, we should see a bus service & - * a function complete interrupt at this point. Note we - * are doing a direct comparison because we don't want to - * be fooled into thinking selection was successful if - * ESP_INTR_DC is set, see below. - */ - if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { - /* target speaks... */ - esp->targets_present |= (1<<SCptr->device->id); - - /* What if the target ignores the sdtr? */ - if (esp->snip) - esp_dev->sync = 1; - - /* See how far, if at all, we got in getting - * the information out to the target. - */ - switch (esp->seqreg) { - default: - - case ESP_STEP_ASEL: - /* Arbitration won, target selected, but - * we are in some phase which is not command - * phase nor is it message out phase. - * - * XXX We've confused the target, obviously. - * XXX So clear it's state, but we also end - * XXX up clearing everyone elses. That isn't - * XXX so nice. I'd like to just reset this - * XXX target, but if I cannot even get it's - * XXX attention and finish selection to talk - * XXX to it, there is not much more I can do. - * XXX If we have a loaded bus we're going to - * XXX spend the next second or so renegotiating - * XXX for synchronous transfers. - */ - ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", - esp->esp_id, SCptr->device->id)); - - case ESP_STEP_SID: - /* Arbitration won, target selected, went - * to message out phase, sent one message - * byte, then we stopped. ATN is asserted - * on the SCSI bus and the target is still - * there hanging on. This is a legal - * sequence step if we gave the ESP a select - * and stop command. - * - * XXX See above, I could set the borken flag - * XXX in the device struct and retry the - * XXX command. But would that help for - * XXX tagged capable targets? - */ - - case ESP_STEP_NCMD: - /* Arbitration won, target selected, maybe - * sent the one message byte in message out - * phase, but we did not go to command phase - * in the end. Actually, we could have sent - * only some of the message bytes if we tried - * to send out the entire identify and tag - * message using ESP_CMD_SA3. - */ - cmd_bytes_sent = 0; - break; - - case ESP_STEP_PPC: - /* No, not the powerPC pinhead. Arbitration - * won, all message bytes sent if we went to - * message out phase, went to command phase - * but only part of the command was sent. - * - * XXX I've seen this, but usually in conjunction - * XXX with a gross error which appears to have - * XXX occurred between the time I told the - * XXX ESP to arbitrate and when I got the - * XXX interrupt. Could I have misloaded the - * XXX command bytes into the fifo? Actually, - * XXX I most likely missed a phase, and therefore - * XXX went into never never land and didn't even - * XXX know it. That was the old driver though. - * XXX What is even more peculiar is that the ESP - * XXX showed the proper function complete and - * XXX bus service bits in the interrupt register. - */ - - case ESP_STEP_FINI4: - case ESP_STEP_FINI5: - case ESP_STEP_FINI6: - case ESP_STEP_FINI7: - /* Account for the identify message */ - if (SCptr->SCp.phase == in_slct_norm) - cmd_bytes_sent -= 1; - }; - - if (esp->erev != fashme) - esp_cmd(esp, ESP_CMD_NULL); - - /* Be careful, we could really get fucked during synchronous - * data transfers if we try to flush the fifo now. - */ - if ((esp->erev != fashme) && /* not a Happy Meal and... */ - !fcnt && /* Fifo is empty and... */ - /* either we are not doing synchronous transfers or... */ - (!esp_dev->sync_max_offset || - /* We are not going into data in phase. */ - ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) - esp_cmd(esp, ESP_CMD_FLUSH); /* flush is safe */ - - /* See how far we got if this is not a slow command. */ - if (!esp->esp_slowcmd) { - if (cmd_bytes_sent < 0) - cmd_bytes_sent = 0; - if (cmd_bytes_sent != SCptr->cmd_len) { - /* Crapola, mark it as a slowcmd - * so that we have some chance of - * keeping the command alive with - * good luck. - * - * XXX Actually, if we didn't send it all - * XXX this means either we didn't set things - * XXX up properly (driver bug) or the target - * XXX or the ESP detected parity on one of - * XXX the command bytes. This makes much - * XXX more sense, and therefore this code - * XXX should be changed to send out a - * XXX parity error message or if the status - * XXX register shows no parity error then - * XXX just expect the target to bring the - * XXX bus into message in phase so that it - * XXX can send us the parity error message. - * XXX SCSI sucks... - */ - esp->esp_slowcmd = 1; - esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); - esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); - } - } - - /* Now figure out where we went. */ - esp_advance_phase(SCptr, in_the_dark); - return esp_do_phase_determine(esp); - } - - /* Did the target even make it? */ - if (esp->ireg == ESP_INTR_DC) { - /* wheee... nobody there or they didn't like - * what we told it to do, clean up. - */ - - /* If anyone is off the bus, but working on - * a command in the background for us, tell - * the ESP to listen for them. - */ - if (esp->disconnected_SC) - esp_cmd(esp, ESP_CMD_ESEL); - - if (((1<<SCptr->device->id) & esp->targets_present) && - esp->seqreg != 0 && - (esp->cur_msgout[0] == EXTENDED_MESSAGE) && - (SCptr->SCp.phase == in_slct_msg || - SCptr->SCp.phase == in_slct_stop)) { - /* shit */ - esp->snip = 0; - ESPLOG(("esp%d: Failed synchronous negotiation for target %d " - "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); - esp_dev->sync_max_offset = 0; - esp_dev->sync_min_period = 0; - esp_dev->sync = 1; /* so we don't negotiate again */ - - /* Run the command again, this time though we - * won't try to negotiate for synchronous transfers. - * - * XXX I'd like to do something like send an - * XXX INITIATOR_ERROR or ABORT message to the - * XXX target to tell it, "Sorry I confused you, - * XXX please come back and I will be nicer next - * XXX time". But that requires having the target - * XXX on the bus, and it has dropped BSY on us. - */ - esp->current_SC = NULL; - esp_advance_phase(SCptr, not_issued); - prepend_SC(&esp->issue_SC, SCptr); - esp_exec_cmd(esp); - return do_intr_end; - } - - /* Ok, this is normal, this is what we see during boot - * or whenever when we are scanning the bus for targets. - * But first make sure that is really what is happening. - */ - if (((1<<SCptr->device->id) & esp->targets_present)) { - ESPLOG(("esp%d: Warning, live target %d not responding to " - "selection.\n", esp->esp_id, SCptr->device->id)); - - /* This _CAN_ happen. The SCSI standard states that - * the target is to _not_ respond to selection if - * _it_ detects bad parity on the bus for any reason. - * Therefore, we assume that if we've talked successfully - * to this target before, bad parity is the problem. - */ - esp_done(esp, (DID_PARITY << 16)); - } else { - /* Else, there really isn't anyone there. */ - ESPMISC(("esp: selection failure, maybe nobody there?\n")); - ESPMISC(("esp: target %d lun %d\n", - SCptr->device->id, SCptr->device->lun)); - esp_done(esp, (DID_BAD_TARGET << 16)); - } - return do_intr_end; - } - - ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); - printk("esp%d: Currently -- ", esp->esp_id); - esp_print_ireg(esp->ireg); printk(" "); - esp_print_statreg(esp->sreg); printk(" "); - esp_print_seqreg(esp->seqreg); printk("\n"); - printk("esp%d: New -- ", esp->esp_id); - esp->sreg = sbus_readb(esp->eregs + ESP_STATUS); - esp->seqreg = sbus_readb(esp->eregs + ESP_SSTEP); - esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); - esp_print_ireg(esp->ireg); printk(" "); - esp_print_statreg(esp->sreg); printk(" "); - esp_print_seqreg(esp->seqreg); printk("\n"); - ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); - return do_reset_bus; /* ugh... */ -} - -/* Continue reading bytes for msgin phase. */ -static int esp_do_msgincont(struct esp *esp) -{ - if (esp->ireg & ESP_INTR_BSERV) { - /* in the right phase too? */ - if ((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { - /* phew... */ - esp_cmd(esp, ESP_CMD_TI); - esp_advance_phase(esp->current_SC, in_msgindone); - return do_intr_end; - } - - /* We changed phase but ESP shows bus service, - * in this case it is most likely that we, the - * hacker who has been up for 20hrs straight - * staring at the screen, drowned in coffee - * smelling like retched cigarette ashes - * have miscoded something..... so, try to - * recover as best we can. - */ - ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id)); - } - esp_advance_phase(esp->current_SC, in_the_dark); - return do_phase_determine; -} - -static int check_singlebyte_msg(struct esp *esp) -{ - esp->prevmsgin = esp->cur_msgin[0]; - if (esp->cur_msgin[0] & 0x80) { - /* wheee... */ - ESPLOG(("esp%d: target sends identify amidst phases\n", - esp->esp_id)); - esp_advance_phase(esp->current_SC, in_the_dark); - return 0; - } else if (((esp->cur_msgin[0] & 0xf0) == 0x20) || - (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { - esp->msgin_len = 2; - esp_advance_phase(esp->current_SC, in_msgincont); - return 0; - } - esp_advance_phase(esp->current_SC, in_the_dark); - switch (esp->cur_msgin[0]) { - default: - /* We don't want to hear about it. */ - ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, - esp->cur_msgin[0])); - return MESSAGE_REJECT; - - case NOP: - ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, - esp->current_SC->device->id)); - return 0; - - case RESTORE_POINTERS: - /* In this case we might also have to backup the - * "slow command" pointer. It is rare to get such - * a save/restore pointer sequence so early in the - * bus transition sequences, but cover it. - */ - if (esp->esp_slowcmd) { - esp->esp_scmdleft = esp->current_SC->cmd_len; - esp->esp_scmdp = &esp->current_SC->cmnd[0]; - } - esp_restore_pointers(esp, esp->current_SC); - return 0; - - case SAVE_POINTERS: - esp_save_pointers(esp, esp->current_SC); - return 0; - - case COMMAND_COMPLETE: - case DISCONNECT: - /* Freeing the bus, let it go. */ - esp->current_SC->SCp.phase = in_freeing; - return 0; - - case MESSAGE_REJECT: - ESPMISC(("msg reject, ")); - if (esp->prevmsgout == EXTENDED_MESSAGE) { - struct esp_device *esp_dev = esp->current_SC->device->hostdata; - - /* Doesn't look like this target can - * do synchronous or WIDE transfers. - */ - ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); - esp_dev->sync = 1; - esp_dev->wide = 1; - esp_dev->sync_min_period = 0; - esp_dev->sync_max_offset = 0; - return 0; - } else { - ESPMISC(("not sync nego, sending ABORT\n")); - return ABORT; - } - }; -} - -/* Target negotiates for synchronous transfers before we do, this - * is legal although very strange. What is even funnier is that - * the SCSI2 standard specifically recommends against targets doing - * this because so many initiators cannot cope with this occurring. - */ -static int target_with_ants_in_pants(struct esp *esp, - struct scsi_cmnd *SCptr, - struct esp_device *esp_dev) -{ - if (esp_dev->sync || SCptr->device->borken) { - /* sorry, no can do */ - ESPSDTR(("forcing to async, ")); - build_sync_nego_msg(esp, 0, 0); - esp_dev->sync = 1; - esp->snip = 1; - ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); - esp_advance_phase(SCptr, in_the_dark); - return EXTENDED_MESSAGE; - } - - /* Ok, we'll check them out... */ - return 0; -} - -static void sync_report(struct esp *esp) -{ - int msg3, msg4; - char *type; - - msg3 = esp->cur_msgin[3]; - msg4 = esp->cur_msgin[4]; - if (msg4) { - int hz = 1000000000 / (msg3 * 4); - int integer = hz / 1000000; - int fraction = (hz - (integer * 1000000)) / 10000; - if ((esp->erev == fashme) && - (esp->config3[esp->current_SC->device->id] & ESP_CONFIG3_EWIDE)) { - type = "FAST-WIDE"; - integer <<= 1; - fraction <<= 1; - } else if ((msg3 * 4) < 200) { - type = "FAST"; - } else { - type = "synchronous"; - } - - /* Do not transform this back into one big printk - * again, it triggers a bug in our sparc64-gcc272 - * sibling call optimization. -DaveM - */ - ESPLOG((KERN_INFO "esp%d: target %d ", - esp->esp_id, esp->current_SC->device->id)); - ESPLOG(("[period %dns offset %d %d.%02dMHz ", - (int) msg3 * 4, (int) msg4, - integer, fraction)); - ESPLOG(("%s SCSI%s]\n", type, - (((msg3 * 4) < 200) ? "-II" : ""))); - } else { - ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n", - esp->esp_id, esp->current_SC->device->id)); - } -} - -static int check_multibyte_msg(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - struct esp_device *esp_dev = SCptr->device->hostdata; - u8 regval = 0; - int message_out = 0; - - ESPSDTR(("chk multibyte msg: ")); - if (esp->cur_msgin[2] == EXTENDED_SDTR) { - int period = esp->cur_msgin[3]; - int offset = esp->cur_msgin[4]; - - ESPSDTR(("is sync nego response, ")); - if (!esp->snip) { - int rval; - - /* Target negotiates first! */ - ESPSDTR(("target jumps the gun, ")); - message_out = EXTENDED_MESSAGE; /* we must respond */ - rval = target_with_ants_in_pants(esp, SCptr, esp_dev); - if (rval) - return rval; - } - - ESPSDTR(("examining sdtr, ")); - - /* Offset cannot be larger than ESP fifo size. */ - if (offset > 15) { - ESPSDTR(("offset too big %2x, ", offset)); - offset = 15; - ESPSDTR(("sending back new offset\n")); - build_sync_nego_msg(esp, period, offset); - return EXTENDED_MESSAGE; - } - - if (offset && period > esp->max_period) { - /* Yeee, async for this slow device. */ - ESPSDTR(("period too long %2x, ", period)); - build_sync_nego_msg(esp, 0, 0); - ESPSDTR(("hoping for msgout\n")); - esp_advance_phase(esp->current_SC, in_the_dark); - return EXTENDED_MESSAGE; - } else if (offset && period < esp->min_period) { - ESPSDTR(("period too short %2x, ", period)); - period = esp->min_period; - if (esp->erev > esp236) - regval = 4; - else - regval = 5; - } else if (offset) { - int tmp; - - ESPSDTR(("period is ok, ")); - tmp = esp->ccycle / 1000; - regval = (((period << 2) + tmp - 1) / tmp); - if (regval && ((esp->erev == fas100a || - esp->erev == fas236 || - esp->erev == fashme))) { - if (period >= 50) - regval--; - } - } - - if (offset) { - u8 bit; - - esp_dev->sync_min_period = (regval & 0x1f); - esp_dev->sync_max_offset = (offset | esp->radelay); - if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) { - if ((esp->erev == fas100a) || (esp->erev == fashme)) - bit = ESP_CONFIG3_FAST; - else - bit = ESP_CONFIG3_FSCSI; - if (period < 50) { - /* On FAS366, if using fast-20 synchronous transfers - * we need to make sure the REQ/ACK assert/deassert - * control bits are clear. - */ - if (esp->erev == fashme) - esp_dev->sync_max_offset &= ~esp->radelay; - esp->config3[SCptr->device->id] |= bit; - } else { - esp->config3[SCptr->device->id] &= ~bit; - } - esp->prev_cfg3 = esp->config3[SCptr->device->id]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - } - esp->prev_soff = esp_dev->sync_max_offset; - esp->prev_stp = esp_dev->sync_min_period; - sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF); - sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP); - ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", - esp_dev->sync_max_offset, - esp_dev->sync_min_period, - esp->config3[SCptr->device->id])); - - esp->snip = 0; - } else if (esp_dev->sync_max_offset) { - u8 bit; - - /* back to async mode */ - ESPSDTR(("unaccaptable sync nego, forcing async\n")); - esp_dev->sync_max_offset = 0; - esp_dev->sync_min_period = 0; - esp->prev_soff = 0; - esp->prev_stp = 0; - sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF); - sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP); - if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) { - if ((esp->erev == fas100a) || (esp->erev == fashme)) - bit = ESP_CONFIG3_FAST; - else - bit = ESP_CONFIG3_FSCSI; - esp->config3[SCptr->device->id] &= ~bit; - esp->prev_cfg3 = esp->config3[SCptr->device->id]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - } - } - - sync_report(esp); - - ESPSDTR(("chk multibyte msg: sync is known, ")); - esp_dev->sync = 1; - - if (message_out) { - ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", - esp->esp_id)); - build_sync_nego_msg(esp, period, offset); - esp_advance_phase(SCptr, in_the_dark); - return EXTENDED_MESSAGE; - } - - ESPSDTR(("returning zero\n")); - esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ - return 0; - } else if (esp->cur_msgin[2] == EXTENDED_WDTR) { - int size = 8 << esp->cur_msgin[3]; - - esp->wnip = 0; - if (esp->erev != fashme) { - ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n", - esp->esp_id)); - message_out = MESSAGE_REJECT; - } else if (size > 16) { - ESPLOG(("esp%d: AIEEE wide transfer for %d size " - "not supported.\n", esp->esp_id, size)); - message_out = MESSAGE_REJECT; - } else { - /* Things look good; let's see what we got. */ - if (size == 16) { - /* Set config 3 register for this target. */ - esp->config3[SCptr->device->id] |= ESP_CONFIG3_EWIDE; - } else { - /* Just make sure it was one byte sized. */ - if (size != 8) { - ESPLOG(("esp%d: Aieee, wide nego of %d size.\n", - esp->esp_id, size)); - message_out = MESSAGE_REJECT; - goto finish; - } - /* Pure paranoia. */ - esp->config3[SCptr->device->id] &= ~(ESP_CONFIG3_EWIDE); - } - esp->prev_cfg3 = esp->config3[SCptr->device->id]; - sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3); - - /* Regardless, next try for sync transfers. */ - build_sync_nego_msg(esp, esp->sync_defp, 15); - esp_dev->sync = 1; - esp->snip = 1; - message_out = EXTENDED_MESSAGE; - } - } else if (esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { - ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); - message_out = MESSAGE_REJECT; - } -finish: - esp_advance_phase(SCptr, in_the_dark); - return message_out; -} - -static int esp_do_msgindone(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - int message_out = 0, it = 0, rval; - - rval = skipahead1(esp, SCptr, in_msgin, in_msgindone); - if (rval) - return rval; - if (SCptr->SCp.sent_command != in_status) { - if (!(esp->ireg & ESP_INTR_DC)) { - if (esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { - message_out = MSG_PARITY_ERROR; - esp_cmd(esp, ESP_CMD_FLUSH); - } else if (esp->erev != fashme && - (it = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES)) != 1) { - /* We certainly dropped the ball somewhere. */ - message_out = INITIATOR_ERROR; - esp_cmd(esp, ESP_CMD_FLUSH); - } else if (!esp->msgin_len) { - if (esp->erev == fashme) - it = esp->hme_fifo_workaround_buffer[0]; - else - it = sbus_readb(esp->eregs + ESP_FDATA); - esp_advance_phase(SCptr, in_msgincont); - } else { - /* it is ok and we want it */ - if (esp->erev == fashme) - it = esp->cur_msgin[esp->msgin_ctr] = - esp->hme_fifo_workaround_buffer[0]; - else - it = esp->cur_msgin[esp->msgin_ctr] = - sbus_readb(esp->eregs + ESP_FDATA); - esp->msgin_ctr++; - } - } else { - esp_advance_phase(SCptr, in_the_dark); - return do_work_bus; - } - } else { - it = esp->cur_msgin[0]; - } - if (!message_out && esp->msgin_len) { - if (esp->msgin_ctr < esp->msgin_len) { - esp_advance_phase(SCptr, in_msgincont); - } else if (esp->msgin_len == 1) { - message_out = check_singlebyte_msg(esp); - } else if (esp->msgin_len == 2) { - if (esp->cur_msgin[0] == EXTENDED_MESSAGE) { - if ((it + 2) >= 15) { - message_out = MESSAGE_REJECT; - } else { - esp->msgin_len = (it + 2); - esp_advance_phase(SCptr, in_msgincont); - } - } else { - message_out = MESSAGE_REJECT; /* foo on you */ - } - } else { - message_out = check_multibyte_msg(esp); - } - } - if (message_out < 0) { - return -message_out; - } else if (message_out) { - if (((message_out != 1) && - ((message_out < 0x20) || (message_out & 0x80)))) - esp->msgout_len = 1; - esp->cur_msgout[0] = message_out; - esp_cmd(esp, ESP_CMD_SATN); - esp_advance_phase(SCptr, in_the_dark); - esp->msgin_len = 0; - } - esp->sreg = sbus_readb(esp->eregs + ESP_STATUS); - esp->sreg &= ~(ESP_STAT_INTR); - if ((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) - esp_cmd(esp, ESP_CMD_MOK); - if ((SCptr->SCp.sent_command == in_msgindone) && - (SCptr->SCp.phase == in_freeing)) - return esp_do_freebus(esp); - return do_intr_end; -} - -static int esp_do_cmdbegin(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - - esp_advance_phase(SCptr, in_cmdend); - if (esp->erev == fashme) { - u32 tmp = sbus_readl(esp->dregs + DMA_CSR); - int i; - - for (i = 0; i < esp->esp_scmdleft; i++) - esp->esp_command[i] = *esp->esp_scmdp++; - esp->esp_scmdleft = 0; - esp_cmd(esp, ESP_CMD_FLUSH); - esp_setcount(esp->eregs, i, 1); - esp_cmd(esp, (ESP_CMD_DMA | ESP_CMD_TI)); - tmp |= (DMA_SCSI_DISAB | DMA_ENABLE); - tmp &= ~(DMA_ST_WRITE); - sbus_writel(i, esp->dregs + DMA_COUNT); - sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR); - sbus_writel(tmp, esp->dregs + DMA_CSR); - } else { - u8 tmp; - - esp_cmd(esp, ESP_CMD_FLUSH); - tmp = *esp->esp_scmdp++; - esp->esp_scmdleft--; - sbus_writeb(tmp, esp->eregs + ESP_FDATA); - esp_cmd(esp, ESP_CMD_TI); - } - return do_intr_end; -} - -static int esp_do_cmddone(struct esp *esp) -{ - if (esp->erev == fashme) - dma_invalidate(esp); - else - esp_cmd(esp, ESP_CMD_NULL); - - if (esp->ireg & ESP_INTR_BSERV) { - esp_advance_phase(esp->current_SC, in_the_dark); - return esp_do_phase_determine(esp); - } - - ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", - esp->esp_id)); - return do_reset_bus; -} - -static int esp_do_msgout(struct esp *esp) -{ - esp_cmd(esp, ESP_CMD_FLUSH); - switch (esp->msgout_len) { - case 1: - if (esp->erev == fashme) - hme_fifo_push(esp, &esp->cur_msgout[0], 1); - else - sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA); - - esp_cmd(esp, ESP_CMD_TI); - break; - - case 2: - esp->esp_command[0] = esp->cur_msgout[0]; - esp->esp_command[1] = esp->cur_msgout[1]; - - if (esp->erev == fashme) { - hme_fifo_push(esp, &esp->cur_msgout[0], 2); - esp_cmd(esp, ESP_CMD_TI); - } else { - dma_setup(esp, esp->esp_command_dvma, 2, 0); - esp_setcount(esp->eregs, 2, 0); - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - } - break; - - case 4: - esp->esp_command[0] = esp->cur_msgout[0]; - esp->esp_command[1] = esp->cur_msgout[1]; - esp->esp_command[2] = esp->cur_msgout[2]; - esp->esp_command[3] = esp->cur_msgout[3]; - esp->snip = 1; - - if (esp->erev == fashme) { - hme_fifo_push(esp, &esp->cur_msgout[0], 4); - esp_cmd(esp, ESP_CMD_TI); - } else { - dma_setup(esp, esp->esp_command_dvma, 4, 0); - esp_setcount(esp->eregs, 4, 0); - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - } - break; - - case 5: - esp->esp_command[0] = esp->cur_msgout[0]; - esp->esp_command[1] = esp->cur_msgout[1]; - esp->esp_command[2] = esp->cur_msgout[2]; - esp->esp_command[3] = esp->cur_msgout[3]; - esp->esp_command[4] = esp->cur_msgout[4]; - esp->snip = 1; - - if (esp->erev == fashme) { - hme_fifo_push(esp, &esp->cur_msgout[0], 5); - esp_cmd(esp, ESP_CMD_TI); - } else { - dma_setup(esp, esp->esp_command_dvma, 5, 0); - esp_setcount(esp->eregs, 5, 0); - esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI); - } - break; - - default: - /* whoops */ - ESPMISC(("bogus msgout sending NOP\n")); - esp->cur_msgout[0] = NOP; - - if (esp->erev == fashme) { - hme_fifo_push(esp, &esp->cur_msgout[0], 1); - } else { - sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA); - } - - esp->msgout_len = 1; - esp_cmd(esp, ESP_CMD_TI); - break; - }; - - esp_advance_phase(esp->current_SC, in_msgoutdone); - return do_intr_end; -} - -static int esp_do_msgoutdone(struct esp *esp) -{ - if (esp->msgout_len > 1) { - /* XXX HME/FAS ATN deassert workaround required, - * XXX no DMA flushing, only possible ESP_CMD_FLUSH - * XXX to kill the fifo. - */ - if (esp->erev != fashme) { - u32 tmp; - - while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ) - udelay(1); - tmp &= ~DMA_ENABLE; - sbus_writel(tmp, esp->dregs + DMA_CSR); - dma_invalidate(esp); - } else { - esp_cmd(esp, ESP_CMD_FLUSH); - } - } - if (!(esp->ireg & ESP_INTR_DC)) { - if (esp->erev != fashme) - esp_cmd(esp, ESP_CMD_NULL); - switch (esp->sreg & ESP_STAT_PMASK) { - case ESP_MOP: - /* whoops, parity error */ - ESPLOG(("esp%d: still in msgout, parity error assumed\n", - esp->esp_id)); - if (esp->msgout_len > 1) - esp_cmd(esp, ESP_CMD_SATN); - esp_advance_phase(esp->current_SC, in_msgout); - return do_work_bus; - - case ESP_DIP: - break; - - default: - /* Happy Meal fifo is touchy... */ - if ((esp->erev != fashme) && - !fcount(esp) && - !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset)) - esp_cmd(esp, ESP_CMD_FLUSH); - break; - - }; - } else { - ESPLOG(("esp%d: disconnect, resetting bus\n", esp->esp_id)); - return do_reset_bus; - } - - /* If we sent out a synchronous negotiation message, update - * our state. - */ - if (esp->cur_msgout[2] == EXTENDED_MESSAGE && - esp->cur_msgout[4] == EXTENDED_SDTR) { - esp->snip = 1; /* anal retentiveness... */ - } - - esp->prevmsgout = esp->cur_msgout[0]; - esp->msgout_len = 0; - esp_advance_phase(esp->current_SC, in_the_dark); - return esp_do_phase_determine(esp); -} - -static int esp_bus_unexpected(struct esp *esp) -{ - ESPLOG(("esp%d: command in weird state %2x\n", - esp->esp_id, esp->current_SC->SCp.phase)); - return do_reset_bus; -} - -static espfunc_t bus_vector[] = { - esp_do_data_finale, - esp_do_data_finale, - esp_bus_unexpected, - esp_do_msgin, - esp_do_msgincont, - esp_do_msgindone, - esp_do_msgout, - esp_do_msgoutdone, - esp_do_cmdbegin, - esp_do_cmddone, - esp_do_status, - esp_do_freebus, - esp_do_phase_determine, - esp_bus_unexpected, - esp_bus_unexpected, - esp_bus_unexpected, -}; - -/* This is the second tier in our dual-level SCSI state machine. */ -static int esp_work_bus(struct esp *esp) -{ - struct scsi_cmnd *SCptr = esp->current_SC; - unsigned int phase; - - ESPBUS(("esp_work_bus: ")); - if (!SCptr) { - ESPBUS(("reconnect\n")); - return esp_do_reconnect(esp); - } - phase = SCptr->SCp.phase; - if ((phase & 0xf0) == in_phases_mask) - return bus_vector[(phase & 0x0f)](esp); - else if ((phase & 0xf0) == in_slct_mask) - return esp_select_complete(esp); - else - return esp_bus_unexpected(esp); -} - -static espfunc_t isvc_vector[] = { - NULL, - esp_do_phase_determine, - esp_do_resetbus, - esp_finish_reset, - esp_work_bus -}; - -/* Main interrupt handler for an esp adapter. */ -static void esp_handle(struct esp *esp) -{ - struct scsi_cmnd *SCptr; - int what_next = do_intr_end; - - SCptr = esp->current_SC; - - /* Check for errors. */ - esp->sreg = sbus_readb(esp->eregs + ESP_STATUS); - esp->sreg &= (~ESP_STAT_INTR); - if (esp->erev == fashme) { - esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2); - esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS); - } - - if (esp->sreg & (ESP_STAT_SPAM)) { - /* Gross error, could be due to one of: - * - * - top of fifo overwritten, could be because - * we tried to do a synchronous transfer with - * an offset greater than ESP fifo size - * - * - top of command register overwritten - * - * - DMA setup to go in one direction, SCSI - * bus points in the other, whoops - * - * - weird phase change during asynchronous - * data phase while we are initiator - */ - ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); - - /* If a command is live on the bus we cannot safely - * reset the bus, so we'll just let the pieces fall - * where they may. Here we are hoping that the - * target will be able to cleanly go away soon - * so we can safely reset things. - */ - if (!SCptr) { - ESPLOG(("esp%d: No current cmd during gross error, " - "resetting bus\n", esp->esp_id)); - what_next = do_reset_bus; - goto state_machine; - } - } - - if (sbus_readl(esp->dregs + DMA_CSR) & DMA_HNDL_ERROR) { - /* A DMA gate array error. Here we must - * be seeing one of two things. Either the - * virtual to physical address translation - * on the SBUS could not occur, else the - * translation it did get pointed to a bogus - * page. Ho hum... - */ - ESPLOG(("esp%d: DMA error %08x\n", esp->esp_id, - sbus_readl(esp->dregs + DMA_CSR))); - - /* DMA gate array itself must be reset to clear the - * error condition. - */ - esp_reset_dma(esp); - - what_next = do_reset_bus; - goto state_machine; - } - - esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); /* Unlatch intr reg */ - - if (esp->erev == fashme) { - /* This chip is really losing. */ - ESPHME(("HME[")); - - ESPHME(("sreg2=%02x,", esp->sreg2)); - /* Must latch fifo before reading the interrupt - * register else garbage ends up in the FIFO - * which confuses the driver utterly. - */ - if (!(esp->sreg2 & ESP_STAT2_FEMPTY) || - (esp->sreg2 & ESP_STAT2_F1BYTE)) { - ESPHME(("fifo_workaround]")); - hme_fifo_read(esp); - } else { - ESPHME(("no_fifo_workaround]")); - } - } - - /* No current cmd is only valid at this point when there are - * commands off the bus or we are trying a reset. - */ - if (!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { - /* Panic is safe, since current_SC is null. */ - ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); - panic("esp_handle: current_SC == penguin within interrupt!"); - } - - if (esp->ireg & (ESP_INTR_IC)) { - /* Illegal command fed to ESP. Outside of obvious - * software bugs that could cause this, there is - * a condition with esp100 where we can confuse the - * ESP into an erroneous illegal command interrupt - * because it does not scrape the FIFO properly - * for reselection. See esp100_reconnect_hwbug() - * to see how we try very hard to avoid this. - */ - ESPLOG(("esp%d: invalid command\n", esp->esp_id)); - - esp_dump_state(esp); - - if (SCptr != NULL) { - /* Devices with very buggy firmware can drop BSY - * during a scatter list interrupt when using sync - * mode transfers. We continue the transfer as - * expected, the target drops the bus, the ESP - * gets confused, and we get a illegal command - * interrupt because the bus is in the disconnected - * state now and ESP_CMD_TI is only allowed when - * a nexus is alive on the bus. - */ - ESPLOG(("esp%d: Forcing async and disabling disconnect for " - "target %d\n", esp->esp_id, SCptr->device->id)); - SCptr->device->borken = 1; /* foo on you */ - } - - what_next = do_reset_bus; - } else if (!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { - if (SCptr) { - unsigned int phase = SCptr->SCp.phase; - - if (phase & in_phases_mask) { - what_next = esp_work_bus(esp); - } else if (phase & in_slct_mask) { - what_next = esp_select_complete(esp); - } else { - ESPLOG(("esp%d: interrupt for no good reason...\n", - esp->esp_id)); - what_next = do_intr_end; - } - } else { - ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", - esp->esp_id)); - what_next = do_reset_bus; - } - } else if (esp->ireg & ESP_INTR_SR) { - ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); - what_next = do_reset_complete; - } else if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { - ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", - esp->esp_id)); - what_next = do_reset_bus; - } else if (esp->ireg & ESP_INTR_RSEL) { - if (SCptr == NULL) { - /* This is ok. */ - what_next = esp_do_reconnect(esp); - } else if (SCptr->SCp.phase & in_slct_mask) { - /* Only selection code knows how to clean - * up properly. - */ - ESPDISC(("Reselected during selection attempt\n")); - what_next = esp_select_complete(esp); - } else { - ESPLOG(("esp%d: Reselected while bus is busy\n", - esp->esp_id)); - what_next = do_reset_bus; - } - } - - /* This is tier-one in our dual level SCSI state machine. */ -state_machine: - while (what_next != do_intr_end) { - if (what_next >= do_phase_determine && - what_next < do_intr_end) { - what_next = isvc_vector[what_next](esp); - } else { - /* state is completely lost ;-( */ - ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", - esp->esp_id)); - what_next = do_reset_bus; - } - } -} - -/* Service only the ESP described by dev_id. */ -static irqreturn_t esp_intr(int irq, void *dev_id) -{ - struct esp *esp = dev_id; - unsigned long flags; - - spin_lock_irqsave(esp->ehost->host_lock, flags); - if (ESP_IRQ_P(esp->dregs)) { - ESP_INTSOFF(esp->dregs); - - ESPIRQ(("I[%d:%d](", smp_processor_id(), esp->esp_id)); - esp_handle(esp); - ESPIRQ((")")); - - ESP_INTSON(esp->dregs); - } - spin_unlock_irqrestore(esp->ehost->host_lock, flags); - - return IRQ_HANDLED; -} - -static int esp_slave_alloc(struct scsi_device *SDptr) -{ - struct esp_device *esp_dev = - kmalloc(sizeof(struct esp_device), GFP_ATOMIC); - - if (!esp_dev) - return -ENOMEM; - memset(esp_dev, 0, sizeof(struct esp_device)); - SDptr->hostdata = esp_dev; - return 0; -} - -static void esp_slave_destroy(struct scsi_device *SDptr) -{ - struct esp *esp = (struct esp *) SDptr->host->hostdata; - - esp->targets_present &= ~(1 << SDptr->id); - kfree(SDptr->hostdata); - SDptr->hostdata = NULL; -} - -static struct scsi_host_template esp_template = { - .module = THIS_MODULE, - .name = "esp", - .info = esp_info, - .slave_alloc = esp_slave_alloc, - .slave_destroy = esp_slave_destroy, - .queuecommand = esp_queue, - .eh_abort_handler = esp_abort, - .eh_bus_reset_handler = esp_reset, - .can_queue = 7, - .this_id = 7, - .sg_tablesize = SG_ALL, - .cmd_per_lun = 1, - .use_clustering = ENABLE_CLUSTERING, - .proc_name = "esp", - .proc_info = esp_proc_info, -}; - -#ifndef CONFIG_SUN4 -static struct of_device_id esp_match[] = { - { - .name = "SUNW,esp", - .data = &esp_template, - }, - { - .name = "SUNW,fas", - .data = &esp_template, - }, - { - .name = "esp", - .data = &esp_template, - }, - {}, -}; -MODULE_DEVICE_TABLE(of, esp_match); - -static struct of_platform_driver esp_sbus_driver = { - .name = "esp", - .match_table = esp_match, - .probe = esp_sbus_probe, - .remove = __devexit_p(esp_sbus_remove), -}; -#endif - -static int __init esp_init(void) -{ -#ifdef CONFIG_SUN4 - return esp_sun4_probe(&esp_template); -#else - return of_register_driver(&esp_sbus_driver, &sbus_bus_type); -#endif -} - -static void __exit esp_exit(void) -{ -#ifdef CONFIG_SUN4 - esp_sun4_remove(); -#else - of_unregister_driver(&esp_sbus_driver); -#endif -} - -MODULE_DESCRIPTION("ESP Sun SCSI driver"); -MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(DRV_VERSION); - -module_init(esp_init); -module_exit(esp_exit); |