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path: root/drivers/scsi/arm/cumana_2.c
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Diffstat (limited to 'drivers/scsi/arm/cumana_2.c')
-rw-r--r--drivers/scsi/arm/cumana_2.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/drivers/scsi/arm/cumana_2.c b/drivers/scsi/arm/cumana_2.c
new file mode 100644
index 000000000..9dcd91226
--- /dev/null
+++ b/drivers/scsi/arm/cumana_2.c
@@ -0,0 +1,519 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/drivers/acorn/scsi/cumana_2.c
+ *
+ * Copyright (C) 1997-2005 Russell King
+ *
+ * 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/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/pgtable.h>
+
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/io.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)
+ */
+static irqreturn_t
+cumanascsi_2_intr(int irq, void *dev_id)
+{
+ 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, map_dir);
+
+ disable_dma(dmach);
+ set_dma_sg(dmach, info->sg, bufs);
+ 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 && strncmp(buffer, "CUMANASCSI2", 11) == 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;
+}
+
+static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+ struct cumanascsi2_info *info;
+ info = (struct cumanascsi2_info *)host->hostdata;
+
+ seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION);
+ fas216_print_host(&info->info, m);
+ seq_printf(m, "Term : o%s\n",
+ info->terms ? "n" : "ff");
+
+ fas216_print_stats(&info->info, m);
+ fas216_print_devices(&info->info, m);
+ return 0;
+}
+
+static struct scsi_host_template cumanascsi2_template = {
+ .module = THIS_MODULE,
+ .show_info = cumanascsi_2_show_info,
+ .write_info = cumanascsi_2_set_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_MAX_SEGMENTS,
+ .dma_boundary = IOMD_DMA_BOUNDARY,
+ .proc_name = "cumanascsi2",
+};
+
+static int cumanascsi2_probe(struct expansion_card *ec,
+ const struct ecard_id *id)
+{
+ struct Scsi_Host *host;
+ struct cumanascsi2_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(&cumanascsi2_template,
+ sizeof(struct cumanascsi2_info));
+ if (!host) {
+ ret = -ENOMEM;
+ goto out_region;
+ }
+
+ 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;
+
+ ecard_setirq(ec, &cumanascsi_2_ops, info);
+
+ ret = fas216_init(host);
+ if (ret)
+ goto out_free;
+
+ ret = request_irq(ec->irq, cumanascsi_2_intr,
+ 0, "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, info);
+
+ out_release:
+ fas216_release(host);
+
+ out_free:
+ scsi_host_put(host);
+
+ out_region:
+ ecard_release_resources(ec);
+
+ out:
+ return ret;
+}
+
+static void 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);
+
+ 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 = 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");
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