diff options
Diffstat (limited to 'drivers/ide/cris')
| -rw-r--r-- | drivers/ide/cris/Makefile | 2 | ||||
| -rw-r--r-- | drivers/ide/cris/ide-cris.c | 1107 | ||||
| -rw-r--r-- | drivers/ide/cris/ide-v10.c | 842 |
3 files changed, 1108 insertions, 843 deletions
diff --git a/drivers/ide/cris/Makefile b/drivers/ide/cris/Makefile index fdc294325d0..6176e8d6b2e 100644 --- a/drivers/ide/cris/Makefile +++ b/drivers/ide/cris/Makefile @@ -1,3 +1,3 @@ EXTRA_CFLAGS += -Idrivers/ide -obj-$(CONFIG_ETRAX_ARCH_V10) += ide-v10.o +obj-y += ide-cris.o diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c new file mode 100644 index 00000000000..cd15e626051 --- /dev/null +++ b/drivers/ide/cris/ide-cris.c @@ -0,0 +1,1107 @@ +/* $Id: cris-ide-driver.patch,v 1.1 2005/06/29 21:39:07 akpm Exp $ + * + * Etrax specific IDE functions, like init and PIO-mode setting etc. + * Almost the entire ide.c is used for the rest of the Etrax ATA driver. + * Copyright (c) 2000-2005 Axis Communications AB + * + * Authors: Bjorn Wesen (initial version) + * Mikael Starvik (crisv32 port) + */ + +/* Regarding DMA: + * + * There are two forms of DMA - "DMA handshaking" between the interface and the drive, + * and DMA between the memory and the interface. We can ALWAYS use the latter, since it's + * something built-in in the Etrax. However only some drives support the DMA-mode handshaking + * on the ATA-bus. The normal PC driver and Triton interface disables memory-if DMA when the + * device can't do DMA handshaking for some stupid reason. We don't need to do that. + */ + +#undef REALLY_SLOW_IO /* most systems can safely undef this */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/blkdev.h> +#include <linux/hdreg.h> +#include <linux/ide.h> +#include <linux/init.h> + +#include <asm/io.h> +#include <asm/dma.h> + +/* number of DMA descriptors */ +#define MAX_DMA_DESCRS 64 + +/* number of times to retry busy-flags when reading/writing IDE-registers + * this can't be too high because a hung harddisk might cause the watchdog + * to trigger (sometimes INB and OUTB are called with irq's disabled) + */ + +#define IDE_REGISTER_TIMEOUT 300 + +#define LOWDB(x) +#define D(x) + +enum /* Transfer types */ +{ + TYPE_PIO, + TYPE_DMA, + TYPE_UDMA +}; + +/* CRISv32 specifics */ +#ifdef CONFIG_ETRAX_ARCH_V32 +#include <asm/arch/hwregs/ata_defs.h> +#include <asm/arch/hwregs/dma_defs.h> +#include <asm/arch/hwregs/dma.h> +#include <asm/arch/pinmux.h> + +#define ATA_UDMA2_CYC 2 +#define ATA_UDMA2_DVS 3 +#define ATA_UDMA1_CYC 2 +#define ATA_UDMA1_DVS 4 +#define ATA_UDMA0_CYC 4 +#define ATA_UDMA0_DVS 6 +#define ATA_DMA2_STROBE 7 +#define ATA_DMA2_HOLD 1 +#define ATA_DMA1_STROBE 8 +#define ATA_DMA1_HOLD 3 +#define ATA_DMA0_STROBE 25 +#define ATA_DMA0_HOLD 19 +#define ATA_PIO4_SETUP 3 +#define ATA_PIO4_STROBE 7 +#define ATA_PIO4_HOLD 1 +#define ATA_PIO3_SETUP 3 +#define ATA_PIO3_STROBE 9 +#define ATA_PIO3_HOLD 3 +#define ATA_PIO2_SETUP 3 +#define ATA_PIO2_STROBE 13 +#define ATA_PIO2_HOLD 5 +#define ATA_PIO1_SETUP 5 +#define ATA_PIO1_STROBE 23 +#define ATA_PIO1_HOLD 9 +#define ATA_PIO0_SETUP 9 +#define ATA_PIO0_STROBE 39 +#define ATA_PIO0_HOLD 9 + +int +cris_ide_ack_intr(ide_hwif_t* hwif) +{ + reg_ata_rw_ctrl2 ctrl2 = REG_TYPE_CONV(reg_ata_rw_ctrl2, + int, hwif->io_ports[0]); + REG_WR_INT(ata, regi_ata, rw_ack_intr, 1 << ctrl2.sel); + return 1; +} + +static inline int +cris_ide_busy(void) +{ + reg_ata_rs_stat_data stat_data; + stat_data = REG_RD(ata, regi_ata, rs_stat_data); + return stat_data.busy; +} + +static inline int +cris_ide_ready(void) +{ + return !cris_ide_busy(); +} + +static inline int +cris_ide_data_available(unsigned short* data) +{ + reg_ata_rs_stat_data stat_data; + stat_data = REG_RD(ata, regi_ata, rs_stat_data); + *data = stat_data.data; + return stat_data.dav; +} + +static void +cris_ide_write_command(unsigned long command) +{ + REG_WR_INT(ata, regi_ata, rw_ctrl2, command); /* write data to the drive's register */ +} + +static void +cris_ide_set_speed(int type, int setup, int strobe, int hold) +{ + reg_ata_rw_ctrl0 ctrl0 = REG_RD(ata, regi_ata, rw_ctrl0); + reg_ata_rw_ctrl1 ctrl1 = REG_RD(ata, regi_ata, rw_ctrl1); + + if (type == TYPE_PIO) { + ctrl0.pio_setup = setup; + ctrl0.pio_strb = strobe; + ctrl0.pio_hold = hold; + } else if (type == TYPE_DMA) { + ctrl0.dma_strb = strobe; + ctrl0.dma_hold = hold; + } else if (type == TYPE_UDMA) { + ctrl1.udma_tcyc = setup; + ctrl1.udma_tdvs = strobe; + } + REG_WR(ata, regi_ata, rw_ctrl0, ctrl0); + REG_WR(ata, regi_ata, rw_ctrl1, ctrl1); +} + +static unsigned long +cris_ide_base_address(int bus) +{ + reg_ata_rw_ctrl2 ctrl2 = {0}; + ctrl2.sel = bus; + return REG_TYPE_CONV(int, reg_ata_rw_ctrl2, ctrl2); +} + +static unsigned long +cris_ide_reg_addr(unsigned long addr, int cs0, int cs1) +{ + reg_ata_rw_ctrl2 ctrl2 = {0}; + ctrl2.addr = addr; + ctrl2.cs1 = cs1; + ctrl2.cs0 = cs0; + return REG_TYPE_CONV(int, reg_ata_rw_ctrl2, ctrl2); +} + +static __init void +cris_ide_reset(unsigned val) +{ + reg_ata_rw_ctrl0 ctrl0 = {0}; + ctrl0.rst = val ? regk_ata_active : regk_ata_inactive; + REG_WR(ata, regi_ata, rw_ctrl0, ctrl0); +} + +static __init void +cris_ide_init(void) +{ + reg_ata_rw_ctrl0 ctrl0 = {0}; + reg_ata_rw_intr_mask intr_mask = {0}; + + ctrl0.en = regk_ata_yes; + REG_WR(ata, regi_ata, rw_ctrl0, ctrl0); + + intr_mask.bus0 = regk_ata_yes; + intr_mask.bus1 = regk_ata_yes; + intr_mask.bus2 = regk_ata_yes; + intr_mask.bus3 = regk_ata_yes; + + REG_WR(ata, regi_ata, rw_intr_mask, intr_mask); + + crisv32_request_dma(2, "ETRAX FS built-in ATA", DMA_VERBOSE_ON_ERROR, 0, dma_ata); + crisv32_request_dma(3, "ETRAX FS built-in ATA", DMA_VERBOSE_ON_ERROR, 0, dma_ata); + + crisv32_pinmux_alloc_fixed(pinmux_ata); + crisv32_pinmux_alloc_fixed(pinmux_ata0); + crisv32_pinmux_alloc_fixed(pinmux_ata1); + crisv32_pinmux_alloc_fixed(pinmux_ata2); + crisv32_pinmux_alloc_fixed(pinmux_ata3); + + DMA_RESET(regi_dma2); + DMA_ENABLE(regi_dma2); + DMA_RESET(regi_dma3); + DMA_ENABLE(regi_dma3); + + DMA_WR_CMD (regi_dma2, regk_dma_set_w_size2); + DMA_WR_CMD (regi_dma3, regk_dma_set_w_size2); +} + +static dma_descr_context mycontext __attribute__ ((__aligned__(32))); + +#define cris_dma_descr_type dma_descr_data +#define cris_pio_read regk_ata_rd +#define cris_ultra_mask 0x7 +#define MAX_DESCR_SIZE 0xffffffffUL + +static unsigned long +cris_ide_get_reg(unsigned long reg) +{ + return (reg & 0x0e000000) >> 25; +} + +static void +cris_ide_fill_descriptor(cris_dma_descr_type *d, void* buf, unsigned int len, int last) +{ + d->buf = (char*)virt_to_phys(buf); + d->after = d->buf + len; + d->eol = last; +} + +static void +cris_ide_start_dma(ide_drive_t *drive, cris_dma_descr_type *d, int dir,int type,int len) +{ + reg_ata_rw_ctrl2 ctrl2 = REG_TYPE_CONV(reg_ata_rw_ctrl2, int, IDE_DATA_REG); + reg_ata_rw_trf_cnt trf_cnt = {0}; + + mycontext.saved_data = (dma_descr_data*)virt_to_phys(d); + mycontext.saved_data_buf = d->buf; + /* start the dma channel */ + DMA_START_CONTEXT(dir ? regi_dma3 : regi_dma2, virt_to_phys(&mycontext)); + + /* initiate a multi word dma read using PIO handshaking */ + trf_cnt.cnt = len >> 1; + /* Due to a "feature" the transfer count has to be one extra word for UDMA. */ + if (type == TYPE_UDMA) + trf_cnt.cnt++; + REG_WR(ata, regi_ata, rw_trf_cnt, trf_cnt); + + ctrl2.rw = dir ? regk_ata_rd : regk_ata_wr; + ctrl2.trf_mode = regk_ata_dma; + ctrl2.hsh = type == TYPE_PIO ? regk_ata_pio : + type == TYPE_DMA ? regk_ata_dma : regk_ata_udma; + ctrl2.multi = regk_ata_yes; + ctrl2.dma_size = regk_ata_word; + REG_WR(ata, regi_ata, rw_ctrl2, ctrl2); +} + +static void +cris_ide_wait_dma(int dir) +{ + reg_dma_rw_stat status; + do + { + status = REG_RD(dma, dir ? regi_dma3 : regi_dma2, rw_stat); + } while(status.list_state != regk_dma_data_at_eol); +} + +static int cris_dma_test_irq(ide_drive_t *drive) +{ + int intr = REG_RD_INT(ata, regi_ata, r_intr); + reg_ata_rw_ctrl2 ctrl2 = REG_TYPE_CONV(reg_ata_rw_ctrl2, int, IDE_DATA_REG); + return intr & (1 << ctrl2.sel) ? 1 : 0; +} + +static void cris_ide_initialize_dma(int dir) +{ +} + +#else +/* CRISv10 specifics */ +#include <asm/arch/svinto.h> +#include <asm/arch/io_interface_mux.h> + +/* PIO timing (in R_ATA_CONFIG) + * + * _____________________________ + * ADDRESS : ________/ + * + * _______________ + * DIOR : ____________/ \__________ + * + * _______________ + * DATA : XXXXXXXXXXXXXXXX_______________XXXXXXXX + * + * + * DIOR is unbuffered while address and data is buffered. + * This creates two problems: + * 1. The DIOR pulse is to early (because it is unbuffered) + * 2. The rise time of DIOR is long + * + * There are at least three different plausible solutions + * 1. Use a pad capable of larger currents in Etrax + * 2. Use an external buffer + * 3. Make the strobe pulse longer + * + * Some of the strobe timings below are modified to compensate + * for this. This implies a slight performance decrease. + * + * THIS SHOULD NEVER BE CHANGED! + * + * TODO: Is this true for the latest LX boards still ? + */ + +#define ATA_UDMA2_CYC 0 /* No UDMA supported, just to make it compile. */ +#define ATA_UDMA2_DVS 0 +#define ATA_UDMA1_CYC 0 +#define ATA_UDMA1_DVS 0 +#define ATA_UDMA0_CYC 0 +#define ATA_UDMA0_DVS 0 +#define ATA_DMA2_STROBE 4 +#define ATA_DMA2_HOLD 0 +#define ATA_DMA1_STROBE 4 +#define ATA_DMA1_HOLD 1 +#define ATA_DMA0_STROBE 12 +#define ATA_DMA0_HOLD 9 +#define ATA_PIO4_SETUP 1 +#define ATA_PIO4_STROBE 5 +#define ATA_PIO4_HOLD 0 +#define ATA_PIO3_SETUP 1 +#define ATA_PIO3_STROBE 5 +#define ATA_PIO3_HOLD 1 +#define ATA_PIO2_SETUP 1 +#define ATA_PIO2_STROBE 6 +#define ATA_PIO2_HOLD 2 +#define ATA_PIO1_SETUP 2 +#define ATA_PIO1_STROBE 11 +#define ATA_PIO1_HOLD 4 +#define ATA_PIO0_SETUP 4 +#define ATA_PIO0_STROBE 19 +#define ATA_PIO0_HOLD 4 + +int +cris_ide_ack_intr(ide_hwif_t* hwif) +{ + return 1; +} + +static inline int +cris_ide_busy(void) +{ + return *R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy) ; +} + +static inline int +cris_ide_ready(void) +{ + return *R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, tr_rdy) ; +} + +static inline int +cris_ide_data_available(unsigned short* data) +{ + unsigned long status = *R_ATA_STATUS_DATA; + *data = (unsigned short)status; + return status & IO_MASK(R_ATA_STATUS_DATA, dav); +} + +static void +cris_ide_write_command(unsigned long command) +{ + *R_ATA_CTRL_DATA = command; +} + +static void +cris_ide_set_speed(int type, int setup, int strobe, int hold) +{ + static int pio_setup = ATA_PIO4_SETUP; + static int pio_strobe = ATA_PIO4_STROBE; + static int pio_hold = ATA_PIO4_HOLD; + static int dma_strobe = ATA_DMA2_STROBE; + static int dma_hold = ATA_DMA2_HOLD; + + if (type == TYPE_PIO) { + pio_setup = setup; + pio_strobe = strobe; + pio_hold = hold; + } else if (type == TYPE_DMA) { + dma_strobe = strobe; + dma_hold = hold; + } + *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | + IO_FIELD( R_ATA_CONFIG, dma_strobe, dma_strobe ) | + IO_FIELD( R_ATA_CONFIG, dma_hold, dma_hold ) | + IO_FIELD( R_ATA_CONFIG, pio_setup, pio_setup ) | + IO_FIELD( R_ATA_CONFIG, pio_strobe, pio_strobe ) | + IO_FIELD( R_ATA_CONFIG, pio_hold, pio_hold ) ); +} + +static unsigned long +cris_ide_base_address(int bus) +{ + return IO_FIELD(R_ATA_CTRL_DATA, sel, bus); +} + +static unsigned long +cris_ide_reg_addr(unsigned long addr, int cs0, int cs1) +{ + return IO_FIELD(R_ATA_CTRL_DATA, addr, addr) | + IO_FIELD(R_ATA_CTRL_DATA, cs0, cs0) | + IO_FIELD(R_ATA_CTRL_DATA, cs1, cs1); +} + +static __init void +cris_ide_reset(unsigned val) +{ +#ifdef CONFIG_ETRAX_IDE_G27_RESET + REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, 27, val); +#endif +#ifdef CONFIG_ETRAX_IDE_CSE1_16_RESET + REG_SHADOW_SET(port_cse1_addr, port_cse1_shadow, 16, val); +#endif +#ifdef CONFIG_ETRAX_IDE_CSP0_8_RESET + REG_SHADOW_SET(port_csp0_addr, port_csp0_shadow, 8, val); +#endif +#ifdef CONFIG_ETRAX_IDE_PB7_RESET + port_pb_dir_shadow = port_pb_dir_shadow | + IO_STATE(R_PORT_PB_DIR, dir7, output); + *R_PORT_PB_DIR = port_pb_dir_shadow; + REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, 7, val); +#endif +} + +static __init void +cris_ide_init(void) +{ + volatile unsigned int dummy; + + *R_ATA_CTRL_DATA = 0; + *R_ATA_TRANSFER_CNT = 0; + *R_ATA_CONFIG = 0; + + if (cris_request_io_interface(if_ata, "ETRAX100LX IDE")) { + printk(KERN_CRIT "ide: Failed to get IO interface\n"); + return; + } else if (cris_request_dma(ATA_TX_DMA_NBR, + "ETRAX100LX IDE TX", + DMA_VERBOSE_ON_ERROR, + dma_ata)) { + cris_free_io_interface(if_ata); + printk(KERN_CRIT "ide: Failed to get Tx DMA channel\n"); + return; + } else if (cris_request_dma(ATA_RX_DMA_NBR, + "ETRAX100LX IDE RX", + DMA_VERBOSE_ON_ERROR, + dma_ata)) { + cris_free_dma(ATA_TX_DMA_NBR, "ETRAX100LX IDE Tx"); + cris_free_io_interface(if_ata); + printk(KERN_CRIT "ide: Failed to get Rx DMA channel\n"); + return; + } + + /* make a dummy read to set the ata controller in a proper state */ + dummy = *R_ATA_STATUS_DATA; + + *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 )); + *R_ATA_CTRL_DATA = ( IO_STATE( R_ATA_CTRL_DATA, rw, read) | + IO_FIELD( R_ATA_CTRL_DATA, addr, 1 ) ); + + while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)); /* wait for busy flag*/ + + *R_IRQ_MASK0_SET = ( IO_STATE( R_IRQ_MASK0_SET, ata_irq0, set ) | + IO_STATE( R_IRQ_MASK0_SET, ata_irq1, set ) | + IO_STATE( R_IRQ_MASK0_SET, ata_irq2, set ) | + IO_STATE( R_IRQ_MASK0_SET, ata_irq3, set ) ); + + /* reset the dma channels we will use */ + + RESET_DMA(ATA_TX_DMA_NBR); + RESET_DMA(ATA_RX_DMA_NBR); + WAIT_DMA(ATA_TX_DMA_NBR); + WAIT_DMA(ATA_RX_DMA_NBR); +} + +#define cris_dma_descr_type etrax_dma_descr +#define cris_pio_read IO_STATE(R_ATA_CTRL_DATA, rw, read) +#define cris_ultra_mask 0x0 +#define MAX_DESCR_SIZE 0x10000UL + +static unsigned long +cris_ide_get_reg(unsigned long reg) +{ + return (reg & 0x0e000000) >> 25; +} + +static void +cris_ide_fill_descriptor(cris_dma_descr_type *d, void* buf, unsigned int len, int last) +{ + d->buf = virt_to_phys(buf); + d->sw_len = len == MAX_DESCR_SIZE ? 0 : len; + if (last) + d->ctrl |= d_eol; +} + +static void cris_ide_start_dma(ide_drive_t *drive, cris_dma_descr_type *d, int dir, int type, int len) +{ + unsigned long cmd; + + if (dir) { + /* need to do this before RX DMA due to a chip bug + * it is enough to just flush the part of the cache that + * corresponds to the buffers we start, but since HD transfers + * usually are more than 8 kB, it is easier to optimize for the + * normal case and just flush the entire cache. its the only + * way to be sure! (OB movie quote) + */ + flush_etrax_cache(); + *R_DMA_CH3_FIRST = virt_to_phys(d); + *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start); + + } else { + *R_DMA_CH2_FIRST = virt_to_phys(d); + *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, start); + } + + /* initiate a multi word dma read using DMA handshaking */ + + *R_ATA_TRANSFER_CNT = + IO_FIELD(R_ATA_TRANSFER_CNT, count, len >> 1); + + cmd = dir ? IO_STATE(R_ATA_CTRL_DATA, rw, read) : IO_STATE(R_ATA_CTRL_DATA, rw, write); + cmd |= type == TYPE_PIO ? IO_STATE(R_ATA_CTRL_DATA, handsh, pio) : + IO_STATE(R_ATA_CTRL_DATA, handsh, dma); + *R_ATA_CTRL_DATA = + cmd | + IO_FIELD(R_ATA_CTRL_DATA, data, IDE_DATA_REG) | + IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) | + IO_STATE(R_ATA_CTRL_DATA, multi, on) | + IO_STATE(R_ATA_CTRL_DATA, dma_size, word); +} + +static void +cris_ide_wait_dma(int dir) +{ + if (dir) + WAIT_DMA(ATA_RX_DMA_NBR); + else + WAIT_DMA(ATA_TX_DMA_NBR); +} + +static int cris_dma_test_irq(ide_drive_t *drive) +{ + int intr = *R_IRQ_MASK0_RD; + int bus = IO_EXTRACT(R_ATA_CTRL_DATA, sel, IDE_DATA_REG); + return intr & (1 << (bus + IO_BITNR(R_IRQ_MASK0_RD, ata_irq0))) ? 1 : 0; +} + + +static void cris_ide_initialize_dma(int dir) +{ + if (dir) + { + RESET_DMA(ATA_RX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */ + WAIT_DMA(ATA_RX_DMA_NBR); + } + else + { + RESET_DMA(ATA_TX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */ + WAIT_DMA(ATA_TX_DMA_NBR); + } +} + +#endif + +void +cris_ide_outw(unsigned short data, unsigned long reg) { + int timeleft; + + LOWDB(printk("ow: data 0x%x, reg 0x%x\n", data, reg)); + + /* note the lack of handling any timeouts. we stop waiting, but we don't + * really notify anybody. + */ + + timeleft = IDE_REGISTER_TIMEOUT; + /* wait for busy flag */ + do { + timeleft--; + } while(timeleft && cris_ide_busy()); + + /* + * Fall through at a timeout, so the ongoing command will be + * aborted by the write below, which is expected to be a dummy + * command to the command register. This happens when a faulty + * drive times out on a command. See comment on timeout in + * INB. + */ + if(!timeleft) + printk("ATA timeout reg 0x%lx := 0x%x\n", reg, data); + + cris_ide_write_command(reg|data); /* write data to the drive's register */ + + timeleft = IDE_REGISTER_TIMEOUT; + /* wait for transmitter ready */ + do { + timeleft--; + } while(timeleft && !cris_ide_ready()); +} + +void +cris_ide_outb(unsigned char data, unsigned long reg) +{ + cris_ide_outw(data, reg); +} + +void +cris_ide_outbsync(ide_drive_t *drive, u8 addr, unsigned long port) +{ + cris_ide_outw(addr, port); +} + +unsigned short +cris_ide_inw(unsigned long reg) { + int timeleft; + unsigned short val; + + timeleft = IDE_REGISTER_TIMEOUT; + /* wait for busy flag */ + do { + timeleft--; + } while(timeleft && cris_ide_busy()); + + if(!timeleft) { + /* + * If we're asked to read the status register, like for + * example when a command does not complete for an + * extended time, but the ATA interface is stuck in a + * busy state at the *ETRAX* ATA interface level (as has + * happened repeatedly with at least one bad disk), then + * the best thing to do is to pretend that we read + * "busy" in the status register, so the IDE driver will + * time-out, abort the ongoing command and perform a + * reset sequence. Note that the subsequent OUT_BYTE + * call will also timeout on busy, but as long as the + * write is still performed, everything will be fine. + */ + if (cris_ide_get_reg(reg) == IDE_STATUS_OFFSET) + return BUSY_STAT; + else + /* For other rare cases we assume 0 is good enough. */ + return 0; + } + + cris_ide_write_command(reg | cris_pio_read); + + timeleft = IDE_REGISTER_TIMEOUT; + /* wait for available */ + do { + timeleft--; + } while(timeleft && !cris_ide_data_available(&val)); + + if(!timeleft) + return 0; + + LOWDB(printk("inb: 0x%x from reg 0x%x\n", val & 0xff, reg)); + + return val; +} + +unsigned char +cris_ide_inb(unsigned long reg) +{ + return (unsigned char)cris_ide_inw(reg); +} + +static int cris_dma_check (ide_drive_t *drive); +static int cris_dma_end (ide_drive_t *drive); +static int cris_dma_setup (ide_drive_t *drive); +static void cris_dma_exec_cmd (ide_drive_t *drive, u8 command); +static int cris_dma_test_irq(ide_drive_t *drive); +static void cris_dma_start(ide_drive_t *drive); +static void cris_ide_input_data (ide_drive_t *drive, void *, unsigned int); +static void cris_ide_output_data (ide_drive_t *drive, void *, unsigned int); +static void cris_atapi_input_bytes(ide_drive_t *drive, void *, unsigned int); +static void cris_atapi_output_bytes(ide_drive_t *drive, void *, unsigned int); +static int cris_dma_off (ide_drive_t *drive); +static int cris_dma_on (ide_drive_t *drive); + +static void tune_cris_ide(ide_drive_t *drive, u8 pio) +{ + int setup, strobe, hold; + + switch(pio) + { + case 0: + setup = ATA_PIO0_SETUP; + strobe = ATA_PIO0_STROBE; + hold = ATA_PIO0_HOLD; + break; + case 1: + setup = ATA_PIO1_SETUP; + strobe = ATA_PIO1_STROBE; + hold = ATA_PIO1_HOLD; + break; + case 2: + setup = ATA_PIO2_SETUP; + strobe = ATA_PIO2_STROBE; + hold = ATA_PIO2_HOLD; + break; + case 3: + setup = ATA_PIO3_SETUP; + strobe = ATA_PIO3_STROBE; + hold = ATA_PIO3_HOLD; + break; + case 4: + setup = ATA_PIO4_SETUP; + strobe = ATA_PIO4_STROBE; + hold = ATA_PIO4_HOLD; + break; + default: + return; + } + + cris_ide_set_speed(TYPE_PIO, setup, strobe, hold); +} + +static int speed_cris_ide(ide_drive_t *drive, u8 speed) +{ + int cyc = 0, dvs = 0, strobe = 0, hold = 0; + + if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) { + tune_cris_ide(drive, speed - XFER_PIO_0); + return 0; + } + + switch(speed) + { + case XFER_UDMA_0: + cyc = ATA_UDMA0_CYC; + dvs = ATA_UDMA0_DVS; + break; + case XFER_UDMA_1: + cyc = ATA_UDMA1_CYC; + dvs = ATA_UDMA1_DVS; + break; + case XFER_UDMA_2: + cyc = ATA_UDMA2_CYC; + dvs = ATA_UDMA2_DVS; + break; + case XFER_MW_DMA_0: + strobe = ATA_DMA0_STROBE; + hold = ATA_DMA0_HOLD; + break; + case XFER_MW_DMA_1: + strobe = ATA_DMA1_STROBE; + hold = ATA_DMA1_HOLD; + break; + case XFER_MW_DMA_2: + strobe = ATA_DMA2_STROBE; + hold = ATA_DMA2_HOLD; + break; + default: + return 0; + } + + if (speed >= XFER_UDMA_0) + cris_ide_set_speed(TYPE_UDMA, cyc, dvs, 0); + else + cris_ide_set_speed(TYPE_DMA, 0, strobe, hold); + + return 0; +} + +void __init +init_e100_ide (void) +{ + hw_regs_t hw; + int ide_offsets[IDE_NR_PORTS]; + int h; + int i; + + printk("ide: ETRAX FS built-in ATA DMA controller\n"); + + for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) + ide_offsets[i] = cris_ide_reg_addr(i, 0, 1); + + /* the IDE control register is at ATA address 6, with CS1 active instead of CS0 */ + ide_offsets[IDE_CONTROL_OFFSET] = cris_ide_reg_addr(6, 1, 0); + + /* first fill in some stuff in the ide_hwifs fields */ + + for(h = 0; h < MAX_HWIFS; h++) { + ide_hwif_t *hwif = &ide_hwifs[h]; + ide_setup_ports(&hw, cris_ide_base_address(h), + ide_offsets, + 0, 0, cris_ide_ack_intr, + ide_default_irq(0)); + ide_register_hw(&hw, &hwif); + hwif->mmio = 2; + hwif->chipset = ide_etrax100; + hwif->tuneproc = &tune_cris_ide; + hwif->speedproc = &speed_cris_ide; + hwif->ata_input_data = &cris_ide_input_data; + hwif->ata_output_data = &cris_ide_output_data; + hwif->atapi_input_bytes = &cris_atapi_input_bytes; + hwif->atapi_output_bytes = &cris_atapi_output_bytes; + hwif->ide_dma_check = &cris_dma_check; + hwif->ide_dma_end = &cris_dma_end; + hwif->dma_setup = &cris_dma_setup; + hwif->dma_exec_cmd = &cris_dma_exec_cmd; + hwif->ide_dma_test_irq = &cris_dma_test_irq; + hwif->dma_start = &cris_dma_start; + hwif->OUTB = &cris_ide_outb; + hwif->OUTW = &cris_ide_outw; + hwif->OUTBSYNC = &cris_ide_outbsync; + hwif->INB = &cris_ide_inb; + hwif->INW = &cris_ide_inw; + hwif->ide_dma_host_off = &cris_dma_off; + hwif->ide_dma_host_on = &cris_dma_on; + hwif->ide_dma_off_quietly = &cris_dma_off; + hwif->udma_four = 0; + hwif->ultra_mask = cris_ultra_mask; + hwif->mwdma_mask = 0x07; /* Multiword DMA 0-2 */ + hwif->swdma_mask = 0x07; /* Singleword DMA 0-2 */ + } + + /* Reset pulse */ + cris_ide_reset(0); + udelay(25); + cris_ide_reset(1); + + cris_ide_init(); + + cris_ide_set_speed(TYPE_PIO, ATA_PIO4_SETUP, ATA_PIO4_STROBE, ATA_PIO4_HOLD); + cris_ide_set_speed(TYPE_DMA, 0, ATA_DMA2_STROBE, ATA_DMA2_HOLD); + cris_ide_set_speed(TYPE_UDMA, ATA_UDMA2_CYC, ATA_UDMA2_DVS, 0); +} + +static int cris_dma_off (ide_drive_t *drive) +{ + return 0; +} + +static int cris_dma_on (ide_drive_t *drive) +{ + return 0; +} + + +static cris_dma_descr_type mydescr __attribute__ ((__aligned__(16))); + +/* + * The following routines are mainly used by the ATAPI drivers. + * + * These routines will round up any request for an odd number of bytes, + * so if an odd bytecount is specified, be sure that there's at least one + * extra byte allocated for the buffer. + */ +static void +cris_atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount) +{ + D(printk("atapi_input_bytes, buffer 0x%x, count %d\n", + buffer, bytecount)); + + if(bytecount & 1) { + printk("warning, odd bytecount in cdrom_in_bytes = %d.\n", bytecount); + bytecount++; /* to round off */ + } + + /* setup DMA and start transfer */ + + cris_ide_fill_descriptor(&mydescr, buffer, bytecount, 1); + cris_ide_start_dma(drive, &mydescr, 1, TYPE_PIO, bytecount); + + /* wait for completion */ + LED_DISK_READ(1); + cris_ide_wait_dma(1); + LED_DISK_READ(0); +} + +static void +cris_atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount) +{ + D(printk("atapi_output_bytes, buffer 0x%x, count %d\n", + buffer, bytecount)); + + if(bytecount & 1) { + printk("odd bytecount %d in atapi_out_bytes!\n", bytecount); + bytecount++; + } + + cris_ide_fill_descriptor(&mydescr, buffer, bytecount, 1); + cris_ide_start_dma(drive, &mydescr, 0, TYPE_PIO, bytecount); + + /* wait for completion */ + + LED_DISK_WRITE(1); + LED_DISK_READ(1); + cris_ide_wait_dma(0); + LED_DISK_WRITE(0); +} + +/* + * This is used for most PIO data transfers *from* the IDE interface + */ +static void +cris_ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount) +{ + cris_atapi_input_bytes(drive, buffer, wcount << 2); +} + +/* + * This is used for most PIO data transfers *to* the IDE interface + */ +static void +cris_ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount) +{ + cris_atapi_output_bytes(drive, buffer, wcount << 2); +} + +/* we only have one DMA channel on the chip for ATA, so we can keep these statically */ +static cris_dma_descr_type ata_descrs[MAX_DMA_DESCRS] __attribute__ ((__aligned__(16))); +static unsigned int ata_tot_size; + +/* + * cris_ide_build_dmatable() prepares a dma request. + * Returns 0 if all went okay, returns 1 otherwise. + */ +static int cris_ide_build_dmatable (ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + struct scatterlist* sg; + struct request *rq = drive->hwif->hwgroup->rq; + unsigned long size, addr; + unsigned int count = 0; + int i = 0; + + sg = hwif->sg_table; + + ata_tot_size = 0; + + ide_map_sg(drive, rq); + i = hwif->sg_nents; + + while(i) { + /* + * Determine addr and size of next buffer area. We assume that + * individual virtual buffers are always composed linearly in + * physical memory. For example, we assume that any 8kB buffer + * is always composed of two adjacent physical 4kB pages rather + * than two possibly non-adjacent physical 4kB pages. + */ + /* group sequential buffers into one large buffer */ + addr = page_to_phys(sg->page) + sg->offset; + size = sg_dma_len(sg); + while (sg++, --i) { + if ((addr + size) != page_to_phys(sg->page) + sg->offset) + break; + size += sg_dma_len(sg); + } + + /* did we run out of descriptors? */ + + if(count >= MAX_DMA_DESCRS) { + printk("%s: too few DMA descriptors\n", drive->name); + return 1; + } + + /* however, this case is more difficult - rw_trf_cnt cannot be more + than 65536 words per transfer, so in that case we need to either + 1) use a DMA interrupt to re-trigger rw_trf_cnt and continue with + the descriptors, or + 2) simply do the request here, and get dma_intr to only ide_end_request on + those blocks that were actually set-up for transfer. + */ + + if(ata_tot_size + size > 131072) { + printk("too large total ATA DMA request, %d + %d!\n", ata_tot_size, (int)size); + return 1; + } + + /* If size > MAX_DESCR_SIZE it has to be splitted into new descriptors. Since we + don't handle size > 131072 only one split is necessary */ + + if(size > MAX_DESCR_SIZE) { + cris_ide_fill_descriptor(&ata_descrs[count], (void*)addr, MAX_DESCR_SIZE, 0); + count++; + ata_tot_size += MAX_DESCR_SIZE; + size -= MAX_DESCR_SIZE; + addr += MAX_DESCR_SIZE; + } + + cris_ide_fill_descriptor(&ata_descrs[count], (void*)addr, size,i ? 0 : 1); + count++; + ata_tot_size += size; + } + + if (count) { + /* return and say all is ok */ + return 0; + } + + printk("%s: empty DMA table?\n", drive->name); + return 1; /* let the PIO routines handle this weirdness */ +} + +static int cris_config_drive_for_dma (ide_drive_t *drive) +{ + u8 speed = ide_dma_speed(drive, 1); + + if (!speed) + return 0; + + speed_cris_ide(drive, speed); + ide_config_drive_speed(drive, speed); + + return ide_dma_enable(drive); +} + +/* + * cris_dma_intr() is the handler for disk read/write DMA interrupts + */ +static ide_startstop_t cris_dma_intr (ide_drive_t *drive) +{ + LED_DISK_READ(0); + LED_DISK_WRITE(0); + + return ide_dma_intr(drive); +} + +/* + * Functions below initiates/aborts DMA read/write operations on a drive. + * + * The caller is assumed to have selected the drive and programmed the drive's + * sector address using CHS or LBA. All that remains is to prepare for DMA + * and then issue the actual read/write DMA/PIO command to the drive. + * + * For ATAPI devices, we just prepare for DMA and return. The caller should + * then issue the packet command to the drive and call us again with + * cris_dma_start afterwards. + * + * Returns 0 if all went well. + * Returns 1 if DMA read/write could not be started, in which case + * the caller should revert to PIO for the current request. + */ + +static int cris_dma_check(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + struct hd_driveid* id = drive->id; + + if (id && (id->capability & 1)) { + if (ide_use_dma(drive)) { + if (cris_config_drive_for_dma(drive)) + return hwif->ide_dma_on(drive); + } + } + + return hwif->ide_dma_off_quietly(drive); +} + +static int cris_dma_end(ide_drive_t *drive) +{ + drive->waiting_for_dma = 0; + return 0; +} + +static int cris_dma_setup(ide_drive_t *drive) +{ + struct request *rq = drive->hwif->hwgroup->rq; + + cris_ide_initialize_dma(!rq_data_dir(rq)); + if (cris_ide_build_dmatable (drive)) { + ide_map_sg(drive, rq); + return 1; + } + + drive->waiting_for_dma = 1; + return 0; +} + +static void cris_dma_exec_cmd(ide_drive_t *drive, u8 command) +{ + /* set the irq handler which will finish the request when DMA is done */ + ide_set_handler(drive, &cris_dma_intr, WAIT_CMD, NULL); + + /* issue cmd to drive */ + cris_ide_outb(command, IDE_COMMAND_REG); +} + +static void cris_dma_start(ide_drive_t *drive) +{ + struct request *rq = drive->hwif->hwgroup->rq; + int writing = rq_data_dir(rq); + int type = TYPE_DMA; + + if (drive->current_speed >= XFER_UDMA_0) + type = TYPE_UDMA; + + cris_ide_start_dma(drive, &ata_descrs[0], writing ? 0 : 1, type, ata_tot_size); + + if (writing) { + LED_DISK_WRITE(1); + } else { + LED_DISK_READ(1); + } +} diff --git a/drivers/ide/cris/ide-v10.c b/drivers/ide/cris/ide-v10.c deleted file mode 100644 index 5b40220d3dd..00000000000 --- a/drivers/ide/cris/ide-v10.c +++ /dev/null @@ -1,842 +0,0 @@ -/* $Id: ide.c,v 1.4 2004/10/12 07:55:48 starvik Exp $ - * - * Etrax specific IDE functions, like init and PIO-mode setting etc. - * Almost the entire ide.c is used for the rest of the Etrax ATA driver. - * Copyright (c) 2000-2004 Axis Communications AB - * - * Authors: Bjorn Wesen (initial version) - * Mikael Starvik (pio setup stuff, Linux 2.6 port) - */ - -/* Regarding DMA: - * - * There are two forms of DMA - "DMA handshaking" between the interface and the drive, - * and DMA between the memory and the interface. We can ALWAYS use the latter, since it's - * something built-in in the Etrax. However only some drives support the DMA-mode handshaking - * on the ATA-bus. The normal PC driver and Triton interface disables memory-if DMA when the - * device can't do DMA handshaking for some stupid reason. We don't need to do that. - */ - -#undef REALLY_SLOW_IO /* most systems can safely undef this */ - -#include <linux/config.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/blkdev.h> -#include <linux/hdreg.h> -#include <linux/ide.h> -#include <linux/init.h> -#include <linux/scatterlist.h> - -#include <asm/io.h> -#include <asm/arch/svinto.h> -#include <asm/dma.h> - -/* number of Etrax DMA descriptors */ -#define MAX_DMA_DESCRS 64 - -/* number of times to retry busy-flags when reading/writing IDE-registers - * this can't be too high because a hung harddisk might cause the watchdog - * to trigger (sometimes INB and OUTB are called with irq's disabled) - */ - -#define IDE_REGISTER_TIMEOUT 300 - -static int e100_read_command = 0; - -#define LOWDB(x) -#define D(x) - -static int e100_ide_build_dmatable (ide_drive_t *drive); -static ide_startstop_t etrax_dma_intr (ide_drive_t *drive); - -void -etrax100_ide_outw(unsigned short data, unsigned long reg) { - int timeleft; - LOWDB(printk("ow: data 0x%x, reg 0x%x\n", data, reg)); - - /* note the lack of handling any timeouts. we stop waiting, but we don't - * really notify anybody. - */ - - timeleft = IDE_REGISTER_TIMEOUT; - /* wait for busy flag */ - while(timeleft && (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy))) - timeleft--; - - /* - * Fall through at a timeout, so the ongoing command will be - * aborted by the write below, which is expected to be a dummy - * command to the command register. This happens when a faulty - * drive times out on a command. See comment on timeout in - * INB. - */ - if(!timeleft) - printk("ATA timeout reg 0x%lx := 0x%x\n", reg, data); - - *R_ATA_CTRL_DATA = reg | data; /* write data to the drive's register */ - - timeleft = IDE_REGISTER_TIMEOUT; - /* wait for transmitter ready */ - while(timeleft && !(*R_ATA_STATUS_DATA & - IO_MASK(R_ATA_STATUS_DATA, tr_rdy))) - timeleft--; -} - -void -etrax100_ide_outb(unsigned char data, unsigned long reg) -{ - etrax100_ide_outw(data, reg); -} - -void -etrax100_ide_outbsync(ide_drive_t *drive, u8 addr, unsigned long port) -{ - etrax100_ide_outw(addr, port); -} - -unsigned short -etrax100_ide_inw(unsigned long reg) { - int status; - int timeleft; - - timeleft = IDE_REGISTER_TIMEOUT; - /* wait for busy flag */ - while(timeleft && (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy))) - timeleft--; - - if(!timeleft) { - /* - * If we're asked to read the status register, like for - * example when a command does not complete for an - * extended time, but the ATA interface is stuck in a - * busy state at the *ETRAX* ATA interface level (as has - * happened repeatedly with at least one bad disk), then - * the best thing to do is to pretend that we read - * "busy" in the status register, so the IDE driver will - * time-out, abort the ongoing command and perform a - * reset sequence. Note that the subsequent OUT_BYTE - * call will also timeout on busy, but as long as the - * write is still performed, everything will be fine. - */ - if ((reg & IO_MASK (R_ATA_CTRL_DATA, addr)) - == IO_FIELD (R_ATA_CTRL_DATA, addr, IDE_STATUS_OFFSET)) - return BUSY_STAT; - else - /* For other rare cases we assume 0 is good enough. */ - return 0; - } - - *R_ATA_CTRL_DATA = reg | IO_STATE(R_ATA_CTRL_DATA, rw, read); /* read data */ - - timeleft = IDE_REGISTER_TIMEOUT; - /* wait for available */ - while(timeleft && !((status = *R_ATA_STATUS_DATA) & - IO_MASK(R_ATA_STATUS_DATA, dav))) - timeleft--; - - if(!timeleft) - return 0; - - LOWDB(printk("inb: 0x%x from reg 0x%x\n", status & 0xff, reg)); - - return (unsigned short)status; -} - -unsigned char -etrax100_ide_inb(unsigned long reg) -{ - return (unsigned char)etrax100_ide_inw(reg); -} - -/* PIO timing (in R_ATA_CONFIG) - * - * _____________________________ - * ADDRESS : ________/ - * - * _______________ - * DIOR : ____________/ \__________ - * - * _______________ - * DATA : XXXXXXXXXXXXXXXX_______________XXXXXXXX - * - * - * DIOR is unbuffered while address and data is buffered. - * This creates two problems: - * 1. The DIOR pulse is to early (because it is unbuffered) - * 2. The rise time of DIOR is long - * - * There are at least three different plausible solutions - * 1. Use a pad capable of larger currents in Etrax - * 2. Use an external buffer - * 3. Make the strobe pulse longer - * - * Some of the strobe timings below are modified to compensate - * for this. This implies a slight performance decrease. - * - * THIS SHOULD NEVER BE CHANGED! - * - * TODO: Is this true for the latest LX boards still ? - */ - -#define ATA_DMA2_STROBE 4 -#define ATA_DMA2_HOLD 0 -#define ATA_DMA1_STROBE 4 -#define ATA_DMA1_HOLD 1 -#define ATA_DMA0_STROBE 12 -#define ATA_DMA0_HOLD 9 -#define ATA_PIO4_SETUP 1 -#define ATA_PIO4_STROBE 5 -#define ATA_PIO4_HOLD 0 -#define ATA_PIO3_SETUP 1 -#define ATA_PIO3_STROBE 5 -#define ATA_PIO3_HOLD 1 -#define ATA_PIO2_SETUP 1 -#define ATA_PIO2_STROBE 6 -#define ATA_PIO2_HOLD 2 -#define ATA_PIO1_SETUP 2 -#define ATA_PIO1_STROBE 11 -#define ATA_PIO1_HOLD 4 -#define ATA_PIO0_SETUP 4 -#define ATA_PIO0_STROBE 19 -#define ATA_PIO0_HOLD 4 - -static int e100_dma_check (ide_drive_t *drive); -static void e100_dma_start(ide_drive_t *drive); -static int e100_dma_end (ide_drive_t *drive); -static void e100_ide_input_data (ide_drive_t *drive, void *, unsigned int); -static void e100_ide_output_data (ide_drive_t *drive, void *, unsigned int); -static void e100_atapi_input_bytes(ide_drive_t *drive, void *, unsigned int); -static void e100_atapi_output_bytes(ide_drive_t *drive, void *, unsigned int); -static int e100_dma_off (ide_drive_t *drive); - - -/* - * good_dma_drives() lists the model names (from "hdparm -i") - * of drives which do not support mword2 DMA but which are - * known to work fine with this interface under Linux. - */ - -const char *good_dma_drives[] = {"Micropolis 2112A", - "CONNER CTMA 4000", - "CONNER CTT8000-A", - NULL}; - -static void tune_e100_ide(ide_drive_t *drive, byte pio) -{ - pio = 4; - /* pio = ide_get_best_pio_mode(drive, pio, 4, NULL); */ - - /* set pio mode! */ - - switch(pio) { - case 0: - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO0_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO0_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO0_HOLD ) ); - break; - case 1: - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO1_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO1_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO1_HOLD ) ); - break; - case 2: - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO2_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO2_HOLD ) ); - break; - case 3: - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO3_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO3_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO3_HOLD ) ); - break; - case 4: - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO4_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO4_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO4_HOLD ) ); - break; - } -} - -static int e100_dma_setup(ide_drive_t *drive) -{ - struct request *rq = drive->hwif->hwgroup->rq; - - if (rq_data_dir(rq)) { - e100_read_command = 0; - - RESET_DMA(ATA_TX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */ - WAIT_DMA(ATA_TX_DMA_NBR); - } else { - e100_read_command = 1; - - RESET_DMA(ATA_RX_DMA_NBR); /* sometimes the DMA channel get stuck so we need to do this */ - WAIT_DMA(ATA_RX_DMA_NBR); - } - - /* set up the Etrax DMA descriptors */ - if (e100_ide_build_dmatable(drive)) { - ide_map_sg(drive, rq); - return 1; - } - - return 0; -} - -static void e100_dma_exec_cmd(ide_drive_t *drive, u8 command) -{ - /* set the irq handler which will finish the request when DMA is done */ - ide_set_handler(drive, &etrax_dma_intr, WAIT_CMD, NULL); - - /* issue cmd to drive */ - etrax100_ide_outb(command, IDE_COMMAND_REG); -} - -void __init -init_e100_ide (void) -{ - volatile unsigned int dummy; - int h; - - printk("ide: ETRAX 100LX built-in ATA DMA controller\n"); - - /* first fill in some stuff in the ide_hwifs fields */ - - for(h = 0; h < MAX_HWIFS; h++) { - ide_hwif_t *hwif = &ide_hwifs[h]; - hwif->mmio = 2; - hwif->chipset = ide_etrax100; - hwif->tuneproc = &tune_e100_ide; - hwif->ata_input_data = &e100_ide_input_data; - hwif->ata_output_data = &e100_ide_output_data; - hwif->atapi_input_bytes = &e100_atapi_input_bytes; - hwif->atapi_output_bytes = &e100_atapi_output_bytes; - hwif->ide_dma_check = &e100_dma_check; - hwif->ide_dma_end = &e100_dma_end; - hwif->dma_setup = &e100_dma_setup; - hwif->dma_exec_cmd = &e100_dma_exec_cmd; - hwif->dma_start = &e100_dma_start; - hwif->OUTB = &etrax100_ide_outb; - hwif->OUTW = &etrax100_ide_outw; - hwif->OUTBSYNC = &etrax100_ide_outbsync; - hwif->INB = &etrax100_ide_inb; - hwif->INW = &etrax100_ide_inw; - hwif->ide_dma_off_quietly = &e100_dma_off; - } - - /* actually reset and configure the etrax100 ide/ata interface */ - - *R_ATA_CTRL_DATA = 0; - *R_ATA_TRANSFER_CNT = 0; - *R_ATA_CONFIG = 0; - - genconfig_shadow = (genconfig_shadow & - ~IO_MASK(R_GEN_CONFIG, dma2) & - ~IO_MASK(R_GEN_CONFIG, dma3) & - ~IO_MASK(R_GEN_CONFIG, ata)) | - ( IO_STATE( R_GEN_CONFIG, dma3, ata ) | - IO_STATE( R_GEN_CONFIG, dma2, ata ) | - IO_STATE( R_GEN_CONFIG, ata, select ) ); - - *R_GEN_CONFIG = genconfig_shadow; - - /* pull the chosen /reset-line low */ - -#ifdef CONFIG_ETRAX_IDE_G27_RESET - REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, 27, 0); -#endif -#ifdef CONFIG_ETRAX_IDE_CSE1_16_RESET - REG_SHADOW_SET(port_cse1_addr, port_cse1_shadow, 16, 0); -#endif -#ifdef CONFIG_ETRAX_IDE_CSP0_8_RESET - REG_SHADOW_SET(port_csp0_addr, port_csp0_shadow, 8, 0); -#endif -#ifdef CONFIG_ETRAX_IDE_PB7_RESET - port_pb_dir_shadow = port_pb_dir_shadow | - IO_STATE(R_PORT_PB_DIR, dir7, output); - *R_PORT_PB_DIR = port_pb_dir_shadow; - REG_SHADOW_SET(R_PORT_PB_DATA, port_pb_data_shadow, 7, 1); -#endif - - /* wait some */ - - udelay(25); - - /* de-assert bus-reset */ - -#ifdef CONFIG_ETRAX_IDE_CSE1_16_RESET - REG_SHADOW_SET(port_cse1_addr, port_cse1_shadow, 16, 1); -#endif -#ifdef CONFIG_ETRAX_IDE_CSP0_8_RESET - REG_SHADOW_SET(port_csp0_addr, port_csp0_shadow, 8, 1); -#endif -#ifdef CONFIG_ETRAX_IDE_G27_RESET - REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow, 27, 1); -#endif - - /* make a dummy read to set the ata controller in a proper state */ - dummy = *R_ATA_STATUS_DATA; - - *R_ATA_CONFIG = ( IO_FIELD( R_ATA_CONFIG, enable, 1 ) | - IO_FIELD( R_ATA_CONFIG, dma_strobe, ATA_DMA2_STROBE ) | - IO_FIELD( R_ATA_CONFIG, dma_hold, ATA_DMA2_HOLD ) | - IO_FIELD( R_ATA_CONFIG, pio_setup, ATA_PIO4_SETUP ) | - IO_FIELD( R_ATA_CONFIG, pio_strobe, ATA_PIO4_STROBE ) | - IO_FIELD( R_ATA_CONFIG, pio_hold, ATA_PIO4_HOLD ) ); - - *R_ATA_CTRL_DATA = ( IO_STATE( R_ATA_CTRL_DATA, rw, read) | - IO_FIELD( R_ATA_CTRL_DATA, addr, 1 ) ); - - while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)); /* wait for busy flag*/ - - *R_IRQ_MASK0_SET = ( IO_STATE( R_IRQ_MASK0_SET, ata_irq0, set ) | - IO_STATE( R_IRQ_MASK0_SET, ata_irq1, set ) | - IO_STATE( R_IRQ_MASK0_SET, ata_irq2, set ) | - IO_STATE( R_IRQ_MASK0_SET, ata_irq3, set ) ); - - printk("ide: waiting %d seconds for drives to regain consciousness\n", - CONFIG_ETRAX_IDE_DELAY); - - h = jiffies + (CONFIG_ETRAX_IDE_DELAY * HZ); - while(time_before(jiffies, h)) /* nothing */ ; - - /* reset the dma channels we will use */ - - RESET_DMA(ATA_TX_DMA_NBR); - RESET_DMA(ATA_RX_DMA_NBR); - WAIT_DMA(ATA_TX_DMA_NBR); - WAIT_DMA(ATA_RX_DMA_NBR); - -} - -static int e100_dma_off (ide_drive_t *drive) -{ - return 0; -} - -static etrax_dma_descr mydescr; - -/* - * The following routines are mainly used by the ATAPI drivers. - * - * These routines will round up any request for an odd number of bytes, - * so if an odd bytecount is specified, be sure that there's at least one - * extra byte allocated for the buffer. - */ -static void -e100_atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount) -{ - unsigned long data_reg = IDE_DATA_REG; - - D(printk("atapi_input_bytes, dreg 0x%x, buffer 0x%x, count %d\n", - data_reg, buffer, bytecount)); - - if(bytecount & 1) { - printk("warning, odd bytecount in cdrom_in_bytes = %d.\n", bytecount); - bytecount++; /* to round off */ - } - - /* make sure the DMA channel is available */ - RESET_DMA(ATA_RX_DMA_NBR); - WAIT_DMA(ATA_RX_DMA_NBR); - - /* setup DMA descriptor */ - - mydescr.sw_len = bytecount; - mydescr.ctrl = d_eol; - mydescr.buf = virt_to_phys(buffer); - - /* start the dma channel */ - - *R_DMA_CH3_FIRST = virt_to_phys(&mydescr); - *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start); - - /* initiate a multi word dma read using PIO handshaking */ - - *R_ATA_TRANSFER_CNT = IO_FIELD(R_ATA_TRANSFER_CNT, count, bytecount >> 1); - - *R_ATA_CTRL_DATA = data_reg | - IO_STATE(R_ATA_CTRL_DATA, rw, read) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) | - IO_STATE(R_ATA_CTRL_DATA, handsh, pio) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - /* wait for completion */ - - LED_DISK_READ(1); - WAIT_DMA(ATA_RX_DMA_NBR); - LED_DISK_READ(0); - -#if 0 - /* old polled transfer code - * this should be moved into a new function that can do polled - * transfers if DMA is not available - */ - - /* initiate a multi word read */ - - *R_ATA_TRANSFER_CNT = wcount << 1; - - *R_ATA_CTRL_DATA = data_reg | - IO_STATE(R_ATA_CTRL_DATA, rw, read) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, register) | - IO_STATE(R_ATA_CTRL_DATA, handsh, pio) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - /* svinto has a latency until the busy bit actually is set */ - - nop(); nop(); - nop(); nop(); - nop(); nop(); - nop(); nop(); - nop(); nop(); - - /* unit should be busy during multi transfer */ - while((status = *R_ATA_STATUS_DATA) & IO_MASK(R_ATA_STATUS_DATA, busy)) { - while(!(status & IO_MASK(R_ATA_STATUS_DATA, dav))) - status = *R_ATA_STATUS_DATA; - *ptr++ = (unsigned short)(status & 0xffff); - } -#endif -} - -static void -e100_atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount) -{ - unsigned long data_reg = IDE_DATA_REG; - - D(printk("atapi_output_bytes, dreg 0x%x, buffer 0x%x, count %d\n", - data_reg, buffer, bytecount)); - - if(bytecount & 1) { - printk("odd bytecount %d in atapi_out_bytes!\n", bytecount); - bytecount++; - } - - /* make sure the DMA channel is available */ - RESET_DMA(ATA_TX_DMA_NBR); - WAIT_DMA(ATA_TX_DMA_NBR); - - /* setup DMA descriptor */ - - mydescr.sw_len = bytecount; - mydescr.ctrl = d_eol; - mydescr.buf = virt_to_phys(buffer); - - /* start the dma channel */ - - *R_DMA_CH2_FIRST = virt_to_phys(&mydescr); - *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, start); - - /* initiate a multi word dma write using PIO handshaking */ - - *R_ATA_TRANSFER_CNT = IO_FIELD(R_ATA_TRANSFER_CNT, count, bytecount >> 1); - - *R_ATA_CTRL_DATA = data_reg | - IO_STATE(R_ATA_CTRL_DATA, rw, write) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) | - IO_STATE(R_ATA_CTRL_DATA, handsh, pio) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - /* wait for completion */ - - LED_DISK_WRITE(1); - WAIT_DMA(ATA_TX_DMA_NBR); - LED_DISK_WRITE(0); - -#if 0 - /* old polled write code - see comment in input_bytes */ - - /* wait for busy flag */ - while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)); - - /* initiate a multi word write */ - - *R_ATA_TRANSFER_CNT = bytecount >> 1; - - ctrl = data_reg | - IO_STATE(R_ATA_CTRL_DATA, rw, write) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, register) | - IO_STATE(R_ATA_CTRL_DATA, handsh, pio) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - LED_DISK_WRITE(1); - - /* Etrax will set busy = 1 until the multi pio transfer has finished - * and tr_rdy = 1 after each successful word transfer. - * When the last byte has been transferred Etrax will first set tr_tdy = 1 - * and then busy = 0 (not in the same cycle). If we read busy before it - * has been set to 0 we will think that we should transfer more bytes - * and then tr_rdy would be 0 forever. This is solved by checking busy - * in the inner loop. - */ - - do { - *R_ATA_CTRL_DATA = ctrl | *ptr++; - while(!(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, tr_rdy)) && - (*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy))); - } while(*R_ATA_STATUS_DATA & IO_MASK(R_ATA_STATUS_DATA, busy)); - - LED_DISK_WRITE(0); -#endif - -} - -/* - * This is used for most PIO data transfers *from* the IDE interface - */ -static void -e100_ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount) -{ - e100_atapi_input_bytes(drive, buffer, wcount << 2); -} - -/* - * This is used for most PIO data transfers *to* the IDE interface - */ -static void -e100_ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount) -{ - e100_atapi_output_bytes(drive, buffer, wcount << 2); -} - -/* we only have one DMA channel on the chip for ATA, so we can keep these statically */ -static etrax_dma_descr ata_descrs[MAX_DMA_DESCRS]; -static unsigned int ata_tot_size; - -/* - * e100_ide_build_dmatable() prepares a dma request. - * Returns 0 if all went okay, returns 1 otherwise. - */ -static int e100_ide_build_dmatable (ide_drive_t *drive) -{ - ide_hwif_t *hwif = HWIF(drive); - struct scatterlist* sg; - struct request *rq = HWGROUP(drive)->rq; - unsigned long size, addr; - unsigned int count = 0; - int i = 0; - - sg = hwif->sg_table; - - ata_tot_size = 0; - - ide_map_sg(drive, rq); - - i = hwif->sg_nents; - - while(i) { - /* - * Determine addr and size of next buffer area. We assume that - * individual virtual buffers are always composed linearly in - * physical memory. For example, we assume that any 8kB buffer - * is always composed of two adjacent physical 4kB pages rather - * than two possibly non-adjacent physical 4kB pages. - */ - /* group sequential buffers into one large buffer */ - addr = page_to_phys(sg->page) + sg->offset; - size = sg_dma_len(sg); - while (sg++, --i) { - if ((addr + size) != page_to_phys(sg->page) + sg->offset) - break; - size += sg_dma_len(sg); - } - - /* did we run out of descriptors? */ - - if(count >= MAX_DMA_DESCRS) { - printk("%s: too few DMA descriptors\n", drive->name); - return 1; - } - - /* however, this case is more difficult - R_ATA_TRANSFER_CNT cannot be more - than 65536 words per transfer, so in that case we need to either - 1) use a DMA interrupt to re-trigger R_ATA_TRANSFER_CNT and continue with - the descriptors, or - 2) simply do the request here, and get dma_intr to only ide_end_request on - those blocks that were actually set-up for transfer. - */ - - if(ata_tot_size + size > 131072) { - printk("too large total ATA DMA request, %d + %d!\n", ata_tot_size, (int)size); - return 1; - } - - /* If size > 65536 it has to be splitted into new descriptors. Since we don't handle - size > 131072 only one split is necessary */ - - if(size > 65536) { - /* ok we want to do IO at addr, size bytes. set up a new descriptor entry */ - ata_descrs[count].sw_len = 0; /* 0 means 65536, this is a 16-bit field */ - ata_descrs[count].ctrl = 0; - ata_descrs[count].buf = addr; - ata_descrs[count].next = virt_to_phys(&ata_descrs[count + 1]); - count++; - ata_tot_size += 65536; - /* size and addr should refere to not handled data */ - size -= 65536; - addr += 65536; - } - /* ok we want to do IO at addr, size bytes. set up a new descriptor entry */ - if(size == 65536) { - ata_descrs[count].sw_len = 0; /* 0 means 65536, this is a 16-bit field */ - } else { - ata_descrs[count].sw_len = size; - } - ata_descrs[count].ctrl = 0; - ata_descrs[count].buf = addr; - ata_descrs[count].next = virt_to_phys(&ata_descrs[count + 1]); - count++; - ata_tot_size += size; - } - - if (count) { - /* set the end-of-list flag on the last descriptor */ - ata_descrs[count - 1].ctrl |= d_eol; - /* return and say all is ok */ - return 0; - } - - printk("%s: empty DMA table?\n", drive->name); - return 1; /* let the PIO routines handle this weirdness */ -} - -static int config_drive_for_dma (ide_drive_t *drive) -{ - const char **list; - struct hd_driveid *id = drive->id; - - if (id && (id->capability & 1)) { - /* Enable DMA on any drive that supports mword2 DMA */ - if ((id->field_valid & 2) && (id->dma_mword & 0x404) == 0x404) { - drive->using_dma = 1; - return 0; /* DMA enabled */ - } - - /* Consult the list of known "good" drives */ - list = good_dma_drives; - while (*list) { - if (!strcmp(*list++,id->model)) { - drive->using_dma = 1; - return 0; /* DMA enabled */ - } - } - } - return 1; /* DMA not enabled */ -} - -/* - * etrax_dma_intr() is the handler for disk read/write DMA interrupts - */ -static ide_startstop_t etrax_dma_intr (ide_drive_t *drive) -{ - LED_DISK_READ(0); - LED_DISK_WRITE(0); - - return ide_dma_intr(drive); -} - -/* - * Functions below initiates/aborts DMA read/write operations on a drive. - * - * The caller is assumed to have selected the drive and programmed the drive's - * sector address using CHS or LBA. All that remains is to prepare for DMA - * and then issue the actual read/write DMA/PIO command to the drive. - * - * Returns 0 if all went well. - * Returns 1 if DMA read/write could not be started, in which case - * the caller should revert to PIO for the current request. - */ - -static int e100_dma_check(ide_drive_t *drive) -{ - return config_drive_for_dma (drive); -} - -static int e100_dma_end(ide_drive_t *drive) -{ - /* TODO: check if something went wrong with the DMA */ - return 0; -} - -static void e100_dma_start(ide_drive_t *drive) -{ - if (e100_read_command) { - /* begin DMA */ - - /* need to do this before RX DMA due to a chip bug - * it is enough to just flush the part of the cache that - * corresponds to the buffers we start, but since HD transfers - * usually are more than 8 kB, it is easier to optimize for the - * normal case and just flush the entire cache. its the only - * way to be sure! (OB movie quote) - */ - flush_etrax_cache(); - *R_DMA_CH3_FIRST = virt_to_phys(ata_descrs); - *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start); - - /* initiate a multi word dma read using DMA handshaking */ - - *R_ATA_TRANSFER_CNT = - IO_FIELD(R_ATA_TRANSFER_CNT, count, ata_tot_size >> 1); - - *R_ATA_CTRL_DATA = - IO_FIELD(R_ATA_CTRL_DATA, data, IDE_DATA_REG) | - IO_STATE(R_ATA_CTRL_DATA, rw, read) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) | - IO_STATE(R_ATA_CTRL_DATA, handsh, dma) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - LED_DISK_READ(1); - - D(printk("dma read of %d bytes.\n", ata_tot_size)); - - } else { - /* writing */ - /* begin DMA */ - - *R_DMA_CH2_FIRST = virt_to_phys(ata_descrs); - *R_DMA_CH2_CMD = IO_STATE(R_DMA_CH2_CMD, cmd, start); - - /* initiate a multi word dma write using DMA handshaking */ - - *R_ATA_TRANSFER_CNT = - IO_FIELD(R_ATA_TRANSFER_CNT, count, ata_tot_size >> 1); - - *R_ATA_CTRL_DATA = - IO_FIELD(R_ATA_CTRL_DATA, data, IDE_DATA_REG) | - IO_STATE(R_ATA_CTRL_DATA, rw, write) | - IO_STATE(R_ATA_CTRL_DATA, src_dst, dma) | - IO_STATE(R_ATA_CTRL_DATA, handsh, dma) | - IO_STATE(R_ATA_CTRL_DATA, multi, on) | - IO_STATE(R_ATA_CTRL_DATA, dma_size, word); - - LED_DISK_WRITE(1); - - D(printk("dma write of %d bytes.\n", ata_tot_size)); - } -} |