summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/arm/arxescsi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/scsi/arm/arxescsi.c')
-rw-r--r--drivers/scsi/arm/arxescsi.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/scsi/arm/arxescsi.c b/drivers/scsi/arm/arxescsi.c
new file mode 100644
index 000000000..591414120
--- /dev/null
+++ b/drivers/scsi/arm/arxescsi.c
@@ -0,0 +1,358 @@
+// 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");
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 22:34:57 +0000