/* * linux/drivers/acorn/scsi/cumana_2.c * * Copyright (C) 1997-2005 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Changelog: * 30-08-1997 RMK 0.0.0 Created, READONLY version. * 22-01-1998 RMK 0.0.1 Updated to 2.1.80. * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it. * 02-05-1998 RMK 0.0.2 Updated & added DMA support. * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h * 18-08-1998 RMK 0.0.3 Fixed synchronous transfer depth. * 02-04-2000 RMK 0.0.4 Updated for new error handling code. */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/proc_fs.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <asm/dma.h> #include <asm/ecard.h> #include <asm/io.h> #include <asm/pgtable.h> #include "../scsi.h" #include <scsi/scsi_host.h> #include "fas216.h" #include "scsi.h" #include <scsi/scsicam.h> #define CUMANASCSI2_STATUS (0x0000) #define STATUS_INT (1 << 0) #define STATUS_DRQ (1 << 1) #define STATUS_LATCHED (1 << 3) #define CUMANASCSI2_ALATCH (0x0014) #define ALATCH_ENA_INT (3) #define ALATCH_DIS_INT (2) #define ALATCH_ENA_TERM (5) #define ALATCH_DIS_TERM (4) #define ALATCH_ENA_BIT32 (11) #define ALATCH_DIS_BIT32 (10) #define ALATCH_ENA_DMA (13) #define ALATCH_DIS_DMA (12) #define ALATCH_DMA_OUT (15) #define ALATCH_DMA_IN (14) #define CUMANASCSI2_PSEUDODMA (0x0200) #define CUMANASCSI2_FAS216_OFFSET (0x0300) #define CUMANASCSI2_FAS216_SHIFT 2 /* * Version */ #define VERSION "1.00 (13/11/2002 2.5.47)" /* * Use term=0,1,0,0,0 to turn terminators on/off */ static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; #define NR_SG 256 struct cumanascsi2_info { FAS216_Info info; struct expansion_card *ec; void __iomem *base; unsigned int terms; /* Terminator state */ struct scatterlist sg[NR_SG]; /* Scatter DMA list */ }; #define CSTATUS_IRQ (1 << 0) #define CSTATUS_DRQ (1 << 1) /* Prototype: void cumanascsi_2_irqenable(ec, irqnr) * Purpose : Enable interrupts on Cumana SCSI 2 card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr) { struct cumanascsi2_info *info = ec->irq_data; writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH); } /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr) * Purpose : Disable interrupts on Cumana SCSI 2 card * Params : ec - expansion card structure * : irqnr - interrupt number */ static void cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr) { struct cumanascsi2_info *info = ec->irq_data; writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH); } static const expansioncard_ops_t cumanascsi_2_ops = { .irqenable = cumanascsi_2_irqenable, .irqdisable = cumanascsi_2_irqdisable, }; /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off) * Purpose : Turn the Cumana SCSI 2 terminators on or off * Params : host - card to turn on/off * : on_off - !0 to turn on, 0 to turn off */ static void cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off) { struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; if (on_off) { info->terms = 1; writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH); } else { info->terms = 0; writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH); } } /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs) * Purpose : handle interrupts from Cumana SCSI 2 card * Params : irq - interrupt number * dev_id - user-defined (Scsi_Host structure) * regs - processor registers at interrupt */ static irqreturn_t cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs) { struct cumanascsi2_info *info = dev_id; return fas216_intr(&info->info); } /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type) * Purpose : initialises DMA/PIO * Params : host - host * SCpnt - command * direction - DMA on to/off of card * min_type - minimum DMA support that we must have for this transfer * Returns : type of transfer to be performed */ static fasdmatype_t cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_type) { struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; struct device *dev = scsi_get_device(host); int dmach = info->info.scsi.dma; writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH); if (dmach != NO_DMA && (min_type == fasdma_real_all || SCp->this_residual >= 512)) { int bufs, map_dir, dma_dir, alatch_dir; bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); if (direction == DMA_OUT) map_dir = DMA_TO_DEVICE, dma_dir = DMA_MODE_WRITE, alatch_dir = ALATCH_DMA_OUT; else map_dir = DMA_FROM_DEVICE, dma_dir = DMA_MODE_READ, alatch_dir = ALATCH_DMA_IN; dma_map_sg(dev, info->sg, bufs + 1, map_dir); disable_dma(dmach); set_dma_sg(dmach, info->sg, bufs + 1); writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH); set_dma_mode(dmach, dma_dir); enable_dma(dmach); writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH); writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH); return fasdma_real_all; } /* * If we're not doing DMA, * we'll do pseudo DMA */ return fasdma_pio; } /* * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer) * Purpose : handles pseudo DMA * Params : host - host * SCpnt - command * direction - DMA on to/off of card * transfer - minimum number of bytes we expect to transfer */ static void cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, int transfer) { struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; unsigned int length; unsigned char *addr; length = SCp->this_residual; addr = SCp->ptr; if (direction == DMA_OUT) #if 0 while (length > 1) { unsigned long word; unsigned int status = readb(info->base + CUMANASCSI2_STATUS); if (status & STATUS_INT) goto end; if (!(status & STATUS_DRQ)) continue; word = *addr | *(addr + 1) << 8; writew(word, info->base + CUMANASCSI2_PSEUDODMA); addr += 2; length -= 2; } #else printk ("PSEUDO_OUT???\n"); #endif else { if (transfer && (transfer & 255)) { while (length >= 256) { unsigned int status = readb(info->base + CUMANASCSI2_STATUS); if (status & STATUS_INT) return; if (!(status & STATUS_DRQ)) continue; readsw(info->base + CUMANASCSI2_PSEUDODMA, addr, 256 >> 1); addr += 256; length -= 256; } } while (length > 0) { unsigned long word; unsigned int status = readb(info->base + CUMANASCSI2_STATUS); if (status & STATUS_INT) return; if (!(status & STATUS_DRQ)) continue; word = readw(info->base + CUMANASCSI2_PSEUDODMA); *addr++ = word; if (--length > 0) { *addr++ = word >> 8; length --; } } } } /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt) * Purpose : stops DMA/PIO * Params : host - host * SCpnt - command */ static void cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) { struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; if (info->info.scsi.dma != NO_DMA) { writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH); disable_dma(info->info.scsi.dma); } } /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host) * Purpose : returns a descriptive string about this interface, * Params : host - driver host structure to return info for. * Returns : pointer to a static buffer containing null terminated string. */ const char *cumanascsi_2_info(struct Scsi_Host *host) { struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; static char string[150]; sprintf(string, "%s (%s) in slot %d v%s terminators o%s", host->hostt->name, info->info.scsi.type, info->ec->slot_no, VERSION, info->terms ? "n" : "ff"); return string; } /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length) * Purpose : Set a driver specific function * Params : host - host to setup * : buffer - buffer containing string describing operation * : length - length of string * Returns : -EINVAL, or 0 */ static int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length) { int ret = length; if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) { buffer += 11; length -= 11; if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { if (buffer[5] == '1') cumanascsi_2_terminator_ctl(host, 1); else if (buffer[5] == '0') cumanascsi_2_terminator_ctl(host, 0); else ret = -EINVAL; } else ret = -EINVAL; } else ret = -EINVAL; return ret; } /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset, * int length, int host_no, int inout) * Purpose : Return information about the driver to a user process accessing * the /proc filesystem. * Params : buffer - a buffer to write information to * start - a pointer into this buffer set by this routine to the start * of the required information. * offset - offset into information that we have read upto. * length - length of buffer * host_no - host number to return information for * inout - 0 for reading, 1 for writing. * Returns : length of data written to buffer. */ int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) { struct cumanascsi2_info *info; char *p = buffer; int pos; if (inout == 1) return cumanascsi_2_set_proc_info(host, buffer, length); info = (struct cumanascsi2_info *)host->hostdata; p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION); p += fas216_print_host(&info->info, p); p += sprintf(p, "Term : o%s\n", info->terms ? "n" : "ff"); p += fas216_print_stats(&info->info, p); p += fas216_print_devices(&info->info, p); *start = buffer + offset; pos = p - buffer - offset; if (pos > length) pos = length; return pos; } static struct scsi_host_template cumanascsi2_template = { .module = THIS_MODULE, .proc_info = cumanascsi_2_proc_info, .name = "Cumana SCSI II", .info = cumanascsi_2_info, .queuecommand = fas216_queue_command, .eh_host_reset_handler = fas216_eh_host_reset, .eh_bus_reset_handler = fas216_eh_bus_reset, .eh_device_reset_handler = fas216_eh_device_reset, .eh_abort_handler = fas216_eh_abort, .can_queue = 1, .this_id = 7, .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = DISABLE_CLUSTERING, .proc_name = "cumanascsi2", }; static int __devinit cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id) { struct Scsi_Host *host; struct cumanascsi2_info *info; unsigned long resbase, reslen; void __iomem *base; int ret; ret = ecard_request_resources(ec); if (ret) goto out; resbase = ecard_resource_start(ec, ECARD_RES_MEMC); reslen = ecard_resource_len(ec, ECARD_RES_MEMC); base = ioremap(resbase, reslen); if (!base) { ret = -ENOMEM; goto out_region; } host = scsi_host_alloc(&cumanascsi2_template, sizeof(struct cumanascsi2_info)); if (!host) { ret = -ENOMEM; goto out_unmap; } ecard_set_drvdata(ec, host); info = (struct cumanascsi2_info *)host->hostdata; info->ec = ec; info->base = base; cumanascsi_2_terminator_ctl(host, term[ec->slot_no]); info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET; info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT; info->info.scsi.irq = ec->irq; info->info.scsi.dma = ec->dma; info->info.ifcfg.clockrate = 40; /* MHz */ info->info.ifcfg.select_timeout = 255; info->info.ifcfg.asyncperiod = 200; /* ns */ info->info.ifcfg.sync_max_depth = 7; info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; info->info.ifcfg.disconnect_ok = 1; info->info.ifcfg.wide_max_size = 0; info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; info->info.dma.setup = cumanascsi_2_dma_setup; info->info.dma.pseudo = cumanascsi_2_dma_pseudo; info->info.dma.stop = cumanascsi_2_dma_stop; ec->irqaddr = info->base + CUMANASCSI2_STATUS; ec->irqmask = STATUS_INT; ec->irq_data = info; ec->ops = &cumanascsi_2_ops; ret = fas216_init(host); if (ret) goto out_free; ret = request_irq(ec->irq, cumanascsi_2_intr, SA_INTERRUPT, "cumanascsi2", info); if (ret) { printk("scsi%d: IRQ%d not free: %d\n", host->host_no, ec->irq, ret); goto out_release; } if (info->info.scsi.dma != NO_DMA) { if (request_dma(info->info.scsi.dma, "cumanascsi2")) { printk("scsi%d: DMA%d not free, using PIO\n", host->host_no, info->info.scsi.dma); info->info.scsi.dma = NO_DMA; } else { set_dma_speed(info->info.scsi.dma, 180); info->info.ifcfg.capabilities |= FASCAP_DMA; } } ret = fas216_add(host, &ec->dev); if (ret == 0) goto out; if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, host); out_release: fas216_release(host); out_free: scsi_host_put(host); out_unmap: iounmap(base); out_region: ecard_release_resources(ec); out: return ret; } static void __devexit cumanascsi2_remove(struct expansion_card *ec) { struct Scsi_Host *host = ecard_get_drvdata(ec); struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; ecard_set_drvdata(ec, NULL); fas216_remove(host); if (info->info.scsi.dma != NO_DMA) free_dma(info->info.scsi.dma); free_irq(ec->irq, info); iounmap(info->base); fas216_release(host); scsi_host_put(host); ecard_release_resources(ec); } static const struct ecard_id cumanascsi2_cids[] = { { MANU_CUMANA, PROD_CUMANA_SCSI_2 }, { 0xffff, 0xffff }, }; static struct ecard_driver cumanascsi2_driver = { .probe = cumanascsi2_probe, .remove = __devexit_p(cumanascsi2_remove), .id_table = cumanascsi2_cids, .drv = { .name = "cumanascsi2", }, }; static int __init cumanascsi2_init(void) { return ecard_register_driver(&cumanascsi2_driver); } static void __exit cumanascsi2_exit(void) { ecard_remove_driver(&cumanascsi2_driver); } module_init(cumanascsi2_init); module_exit(cumanascsi2_exit); MODULE_AUTHOR("Russell King"); MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines"); module_param_array(term, int, NULL, 0); MODULE_PARM_DESC(term, "SCSI bus termination"); MODULE_LICENSE("GPL");