// SPDX-License-Identifier: GPL-2.0-only /* * linux/drivers/scsi/arm/arxescsi.c * * Copyright (C) 1997-2000 Russell King, Stefan Hanske * * This driver is based on experimentation. Hence, it may have made * assumptions about the particular card that I have available, and * may not be reliable! * * Changelog: * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c * 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. * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card * enabled writing * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing * (arxescsi_pseudo_dma_write) * 02-04-2000 RMK 0.1.1 Updated for new error handling code. * 22-10-2000 SH Updated for new registering scheme. */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/proc_fs.h> #include <linux/unistd.h> #include <linux/stat.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <asm/dma.h> #include <asm/io.h> #include <asm/ecard.h> #include "../scsi.h" #include <scsi/scsi_host.h> #include "fas216.h" struct arxescsi_info { FAS216_Info info; struct expansion_card *ec; void __iomem *base; }; #define DMADATA_OFFSET (0x200) #define DMASTAT_OFFSET (0x600) #define DMASTAT_DRQ (1 << 0) #define CSTATUS_IRQ (1 << 0) #define VERSION "1.10 (23/01/2003 2.5.57)" /* * Function: int arxescsi_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 : 0 if we should not set CMD_WITHDMA for transfer info command */ static fasdmatype_t arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_type) { /* * We don't do real DMA */ return fasdma_pseudo; } static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base) { __asm__ __volatile__( " stmdb sp!, {r0-r12}\n" " mov r3, %0\n" " mov r1, %1\n" " add r2, r1, #512\n" " mov r4, #256\n" ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n" " mov r5, r6, lsl #16\n" " mov r7, r8, lsl #16\n" ".loop_2: ldrb r0, [r1, #1536]\n" " tst r0, #1\n" " beq .loop_2\n" " stmia r2, {r5-r8}\n\t" " mov r9, r10, lsl #16\n" " mov r11, r12, lsl #16\n" ".loop_3: ldrb r0, [r1, #1536]\n" " tst r0, #1\n" " beq .loop_3\n" " stmia r2, {r9-r12}\n" " subs r4, r4, #16\n" " bne .loop_1\n" " ldmia sp!, {r0-r12}\n" : : "r" (addr), "r" (base)); } /* * Function: int arxescsi_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 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, int transfer) { struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; unsigned int length, error = 0; void __iomem *base = info->info.scsi.io_base; unsigned char *addr; length = SCp->this_residual; addr = SCp->ptr; if (direction == DMA_OUT) { unsigned int word; while (length > 256) { if (readb(base + 0x80) & STAT_INT) { error = 1; break; } arxescsi_pseudo_dma_write(addr, base); addr += 256; length -= 256; } if (!error) while (length > 0) { if (readb(base + 0x80) & STAT_INT) break; if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) continue; word = *addr | *(addr + 1) << 8; writew(word, base + DMADATA_OFFSET); if (length > 1) { addr += 2; length -= 2; } else { addr += 1; length -= 1; } } } else { if (transfer && (transfer & 255)) { while (length >= 256) { if (readb(base + 0x80) & STAT_INT) { error = 1; break; } if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) continue; readsw(base + DMADATA_OFFSET, addr, 256 >> 1); addr += 256; length -= 256; } } if (!(error)) while (length > 0) { unsigned long word; if (readb(base + 0x80) & STAT_INT) break; if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) continue; word = readw(base + DMADATA_OFFSET); *addr++ = word; if (--length > 0) { *addr++ = word >> 8; length --; } } } } /* * Function: int arxescsi_dma_stop(host, SCpnt) * Purpose : stops DMA/PIO * Params : host - host * SCpnt - command */ static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) { /* * no DMA to stop */ } /* * Function: const char *arxescsi_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. */ static const char *arxescsi_info(struct Scsi_Host *host) { struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; static char string[150]; sprintf(string, "%s (%s) in slot %d v%s", host->hostt->name, info->info.scsi.type, info->ec->slot_no, VERSION); return string; } static int arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host) { struct arxescsi_info *info; info = (struct arxescsi_info *)host->hostdata; seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION); fas216_print_host(&info->info, m); fas216_print_stats(&info->info, m); fas216_print_devices(&info->info, m); return 0; } static struct scsi_host_template arxescsi_template = { .show_info = arxescsi_show_info, .name = "ARXE SCSI card", .info = arxescsi_info, .queuecommand = fas216_noqueue_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 = 0, .this_id = 7, .sg_tablesize = SG_ALL, .dma_boundary = PAGE_SIZE - 1, .proc_name = "arxescsi", }; static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id) { struct Scsi_Host *host; struct arxescsi_info *info; void __iomem *base; int ret; ret = ecard_request_resources(ec); if (ret) goto out; base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); if (!base) { ret = -ENOMEM; goto out_region; } host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info)); if (!host) { ret = -ENOMEM; goto out_region; } info = (struct arxescsi_info *)host->hostdata; info->ec = ec; info->base = base; info->info.scsi.io_base = base + 0x2000; info->info.scsi.irq = 0; info->info.scsi.dma = NO_DMA; info->info.scsi.io_shift = 5; info->info.ifcfg.clockrate = 24; /* MHz */ info->info.ifcfg.select_timeout = 255; info->info.ifcfg.asyncperiod = 200; /* ns */ info->info.ifcfg.sync_max_depth = 0; info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK; info->info.ifcfg.disconnect_ok = 0; info->info.ifcfg.wide_max_size = 0; info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; info->info.dma.setup = arxescsi_dma_setup; info->info.dma.pseudo = arxescsi_dma_pseudo; info->info.dma.stop = arxescsi_dma_stop; ec->irqaddr = base; ec->irqmask = CSTATUS_IRQ; ret = fas216_init(host); if (ret) goto out_unregister; ret = fas216_add(host, &ec->dev); if (ret == 0) goto out; fas216_release(host); out_unregister: scsi_host_put(host); out_region: ecard_release_resources(ec); out: return ret; } static void arxescsi_remove(struct expansion_card *ec) { struct Scsi_Host *host = ecard_get_drvdata(ec); ecard_set_drvdata(ec, NULL); fas216_remove(host); fas216_release(host); scsi_host_put(host); ecard_release_resources(ec); } static const struct ecard_id arxescsi_cids[] = { { MANU_ARXE, PROD_ARXE_SCSI }, { 0xffff, 0xffff }, }; static struct ecard_driver arxescsi_driver = { .probe = arxescsi_probe, .remove = arxescsi_remove, .id_table = arxescsi_cids, .drv = { .name = "arxescsi", }, }; static int __init init_arxe_scsi_driver(void) { return ecard_register_driver(&arxescsi_driver); } static void __exit exit_arxe_scsi_driver(void) { ecard_remove_driver(&arxescsi_driver); } module_init(init_arxe_scsi_driver); module_exit(exit_arxe_scsi_driver); MODULE_AUTHOR("Stefan Hanske"); MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines"); MODULE_LICENSE("GPL");