1 files changed, 680 insertions, 0 deletions

diff --git a/drivers/scsi/arm/eesox.c b/drivers/scsi/arm/eesox.c
new file mode 100644
index 000000000000..78b7e543471b
--- /dev/null
+++ b/drivers/scsi/arm/eesox.c
@@ -0,0 +1,680 @@
+/*
+ *  linux/drivers/acorn/scsi/eesox.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.
+ *
+ *  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:
+ *   01-10-1997 RMK             Created, READONLY version
+ *   15-02-1998 RMK             READ/WRITE version
+ *                              added DMA support and hardware definitions
+ *   14-03-1998 RMK             Updated DMA support
+ *                              Added terminator control
+ *   15-04-1998 RMK             Only do PIO if FAS216 will allow it.
+ *   27-06-1998 RMK             Changed asm/delay.h to linux/delay.h
+ *   02-04-2000 RMK     0.0.3   Fixed NO_IRQ/NO_DMA problem, 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/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/pgtable.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+#include "scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define EESOX_FAS216_OFFSET     0x3000
+#define EESOX_FAS216_SHIFT      5
+
+#define EESOX_DMASTAT           0x2800
+#define EESOX_STAT_INTR         0x01
+#define EESOX_STAT_DMA          0x02
+
+#define EESOX_CONTROL           0x2800
+#define EESOX_INTR_ENABLE       0x04
+#define EESOX_TERM_ENABLE       0x02
+#define EESOX_RESET             0x01
+
+#define EESOX_DMADATA           0x3800
+
+#define VERSION "1.10 (17/01/2003 2.5.59)"
+
+/*
+ * 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 eesoxscsi_info {
+        FAS216_Info             info;
+        struct expansion_card   *ec;
+        void __iomem            *base;
+        void __iomem            *ctl_port;
+        unsigned int            control;
+        struct scatterlist      sg[NR_SG];      /* Scatter DMA list     */
+};
+
+/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
+ * Purpose  : Enable interrupts on EESOX SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
+
+        info->control |= EESOX_INTR_ENABLE;
+
+        writeb(info->control, info->ctl_port);
+}
+
+/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
+ * Purpose  : Disable interrupts on EESOX SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
+
+        info->control &= ~EESOX_INTR_ENABLE;
+
+        writeb(info->control, info->ctl_port);
+}
+
+static const expansioncard_ops_t eesoxscsi_ops = {
+        .irqenable      = eesoxscsi_irqenable,
+        .irqdisable     = eesoxscsi_irqdisable,
+};
+
+/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
+ * Purpose  : Turn the EESOX SCSI terminators on or off
+ * Params   : host   - card to turn on/off
+ *          : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+        unsigned long flags;
+
+        spin_lock_irqsave(host->host_lock, flags);
+        if (on_off)
+                info->control |= EESOX_TERM_ENABLE;
+        else
+                info->control &= ~EESOX_TERM_ENABLE;
+
+        writeb(info->control, info->ctl_port);
+        spin_unlock_irqrestore(host->host_lock, flags);
+}
+
+/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
+ * Purpose  : handle interrupts from EESOX SCSI card
+ * Params   : irq    - interrupt number
+ *            dev_id - user-defined (Scsi_Host structure)
+ *            regs   - processor registers at interrupt
+ */
+static irqreturn_t
+eesoxscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct eesoxscsi_info *info = dev_id;
+
+        return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t eesoxscsi_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
+eesoxscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
+                       fasdmadir_t direction, fasdmatype_t min_type)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+        struct device *dev = scsi_get_device(host);
+        int dmach = info->info.scsi.dma;
+
+        if (dmach != NO_DMA &&
+            (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
+                int bufs, map_dir, dma_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;
+                else
+                        map_dir = DMA_FROM_DEVICE,
+                        dma_dir = DMA_MODE_READ;
+
+                dma_map_sg(dev, info->sg, bufs + 1, map_dir);
+
+                disable_dma(dmach);
+                set_dma_sg(dmach, info->sg, bufs + 1);
+                set_dma_mode(dmach, dma_dir);
+                enable_dma(dmach);
+                return fasdma_real_all;
+        }
+        /*
+         * We don't do DMA, we only do slow PIO
+         *
+         * Some day, we will do Pseudo DMA
+         */
+        return fasdma_pseudo;
+}
+
+static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
+{
+        const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
+        const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
+        const void __iomem *reg_dmadata = base + EESOX_DMADATA;
+        const register unsigned long mask = 0xffff;
+
+        do {
+                unsigned int status;
+
+                /*
+                 * Interrupt request?
+                 */
+                status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
+                if (status & STAT_INT)
+                        break;
+
+                /*
+                 * DMA request active?
+                 */
+                status = readb(reg_dmastat);
+                if (!(status & EESOX_STAT_DMA))
+                        continue;
+
+                /*
+                 * Get number of bytes in FIFO
+                 */
+                status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
+                if (status > 16)
+                        status = 16;
+                if (status > length)
+                        status = length;
+
+                /*
+                 * Align buffer.
+                 */
+                if (((u32)buf) & 2 && status >= 2) {
+                        *(u16 *)buf = readl(reg_dmadata);
+                        buf += 2;
+                        status -= 2;
+                        length -= 2;
+                }
+
+                if (status >= 8) {
+                        unsigned long l1, l2;
+
+                        l1 = readl(reg_dmadata) & mask;
+                        l1 |= readl(reg_dmadata) << 16;
+                        l2 = readl(reg_dmadata) & mask;
+                        l2 |= readl(reg_dmadata) << 16;
+                        *(u32 *)buf = l1;
+                        buf += 4;
+                        *(u32 *)buf = l2;
+                        buf += 4;
+                        length -= 8;
+                        continue;
+                }
+
+                if (status >= 4) {
+                        unsigned long l1;
+
+                        l1 = readl(reg_dmadata) & mask;
+                        l1 |= readl(reg_dmadata) << 16;
+
+                        *(u32 *)buf = l1;
+                        buf += 4;
+                        length -= 4;
+                        continue;
+                }
+
+                if (status >= 2) {
+                        *(u16 *)buf = readl(reg_dmadata);
+                        buf += 2;
+                        length -= 2;
+                }
+        } while (length);
+}
+
+static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
+{
+        const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
+        const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
+        const void __iomem *reg_dmadata = base + EESOX_DMADATA;
+
+        do {
+                unsigned int status;
+
+                /*
+                 * Interrupt request?
+                 */
+                status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
+                if (status & STAT_INT)
+                        break;
+
+                /*
+                 * DMA request active?
+                 */
+                status = readb(reg_dmastat);
+                if (!(status & EESOX_STAT_DMA))
+                        continue;
+
+                /*
+                 * Get number of bytes in FIFO
+                 */
+                status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
+                if (status > 16)
+                        status = 16;
+                status = 16 - status;
+                if (status > length)
+                        status = length;
+                status &= ~1;
+
+                /*
+                 * Align buffer.
+                 */
+                if (((u32)buf) & 2 && status >= 2) {
+                        writel(*(u16 *)buf << 16, reg_dmadata);
+                        buf += 2;
+                        status -= 2;
+                        length -= 2;
+                }
+
+                if (status >= 8) {
+                        unsigned long l1, l2;
+
+                        l1 = *(u32 *)buf;
+                        buf += 4;
+                        l2 = *(u32 *)buf;
+                        buf += 4;
+
+                        writel(l1 << 16, reg_dmadata);
+                        writel(l1, reg_dmadata);
+                        writel(l2 << 16, reg_dmadata);
+                        writel(l2, reg_dmadata);
+                        length -= 8;
+                        continue;
+                }
+
+                if (status >= 4) {
+                        unsigned long l1;
+
+                        l1 = *(u32 *)buf;
+                        buf += 4;
+
+                        writel(l1 << 16, reg_dmadata);
+                        writel(l1, reg_dmadata);
+                        length -= 4;
+                        continue;
+                }
+
+                if (status >= 2) {
+                        writel(*(u16 *)buf << 16, reg_dmadata);
+                        buf += 2;
+                        length -= 2;
+                }
+        } while (length);
+}
+
+static void
+eesoxscsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
+                     fasdmadir_t dir, int transfer_size)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+        if (dir == DMA_IN) {
+                eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
+        } else {
+                eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
+        }
+}
+
+/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
+ * Purpose  : stops DMA/PIO
+ * Params   : host  - host
+ *            SCpnt - command
+ */
+static void
+eesoxscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+        if (info->info.scsi.dma != NO_DMA)
+                disable_dma(info->info.scsi.dma);
+}
+
+/* Prototype: const char *eesoxscsi_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 *eesoxscsi_info(struct Scsi_Host *host)
+{
+        struct eesoxscsi_info *info = (struct eesoxscsi_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->control & EESOX_TERM_ENABLE ? "n" : "ff");
+
+        return string;
+}
+
+/* Prototype: int eesoxscsi_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
+eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+        int ret = length;
+
+        if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
+                buffer += 9;
+                length -= 9;
+
+                if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+                        if (buffer[5] == '1')
+                                eesoxscsi_terminator_ctl(host, 1);
+                        else if (buffer[5] == '0')
+                                eesoxscsi_terminator_ctl(host, 0);
+                        else
+                                ret = -EINVAL;
+                } else
+                        ret = -EINVAL;
+        } else
+                ret = -EINVAL;
+
+        return ret;
+}
+
+/* Prototype: int eesoxscsi_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 eesoxscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
+                            int length, int inout)
+{
+        struct eesoxscsi_info *info;
+        char *p = buffer;
+        int pos;
+
+        if (inout == 1)
+                return eesoxscsi_set_proc_info(host, buffer, length);
+
+        info = (struct eesoxscsi_info *)host->hostdata;
+
+        p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION);
+        p += fas216_print_host(&info->info, p);
+        p += sprintf(p, "Term    : o%s\n",
+                        info->control & EESOX_TERM_ENABLE ? "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 ssize_t eesoxscsi_show_term(struct device *dev, char *buf)
+{
+        struct expansion_card *ec = ECARD_DEV(dev);
+        struct Scsi_Host *host = ecard_get_drvdata(ec);
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+
+        return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
+}
+
+static ssize_t eesoxscsi_store_term(struct device *dev, const char *buf, size_t len)
+{
+        struct expansion_card *ec = ECARD_DEV(dev);
+        struct Scsi_Host *host = ecard_get_drvdata(ec);
+        struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+        unsigned long flags;
+
+        if (len > 1) {
+                spin_lock_irqsave(host->host_lock, flags);
+                if (buf[0] != '0') {
+                        info->control |= EESOX_TERM_ENABLE;
+                } else {
+                        info->control &= ~EESOX_TERM_ENABLE;
+                }
+                writeb(info->control, info->ctl_port);
+                spin_unlock_irqrestore(host->host_lock, flags);
+        }
+
+        return len;
+}
+
+static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
+                   eesoxscsi_show_term, eesoxscsi_store_term);
+
+static Scsi_Host_Template eesox_template = {
+        .module                         = THIS_MODULE,
+        .proc_info                      = eesoxscsi_proc_info,
+        .name                           = "EESOX SCSI",
+        .info                           = eesoxscsi_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                      = "eesox",
+};
+
+static int __devinit
+eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+        struct Scsi_Host *host;
+        struct eesoxscsi_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_IOCFAST);
+        reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
+        base = ioremap(resbase, reslen);
+        if (!base) {
+                ret = -ENOMEM;
+                goto out_region;
+        }
+
+        host = scsi_host_alloc(&eesox_template,
+                               sizeof(struct eesoxscsi_info));
+        if (!host) {
+                ret = -ENOMEM;
+                goto out_unmap;
+        }
+
+        ecard_set_drvdata(ec, host);
+
+        info = (struct eesoxscsi_info *)host->hostdata;
+        info->ec        = ec;
+        info->base      = base;
+        info->ctl_port  = base + EESOX_CONTROL;
+        info->control   = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
+        writeb(info->control, info->ctl_port);
+
+        info->info.scsi.io_base         = base + EESOX_FAS216_OFFSET;
+        info->info.scsi.io_shift        = EESOX_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_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            = eesoxscsi_dma_setup;
+        info->info.dma.pseudo           = eesoxscsi_dma_pseudo;
+        info->info.dma.stop             = eesoxscsi_dma_stop;
+
+        ec->irqaddr     = base + EESOX_DMASTAT;
+        ec->irqmask     = EESOX_STAT_INTR;
+        ec->irq_data    = info;
+        ec->ops         = &eesoxscsi_ops;
+
+        device_create_file(&ec->dev, &dev_attr_bus_term);
+
+        ret = fas216_init(host);
+        if (ret)
+                goto out_free;
+
+        ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
+        if (ret) {
+                printk("scsi%d: IRQ%d not free: %d\n",
+                       host->host_no, ec->irq, ret);
+                goto out_remove;
+        }
+
+        if (info->info.scsi.dma != NO_DMA) {
+                if (request_dma(info->info.scsi.dma, "eesox")) {
+                        printk("scsi%d: DMA%d not free, DMA disabled\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;
+                        info->info.ifcfg.cntl3 |= CNTL3_BS8;
+                }
+        }
+
+        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_remove:
+        fas216_remove(host);
+
+ out_free:
+        device_remove_file(&ec->dev, &dev_attr_bus_term);
+        scsi_host_put(host);
+
+ out_unmap:
+        iounmap(base);
+
+ out_region:
+        ecard_release_resources(ec);
+
+ out:
+        return ret;
+}
+
+static void __devexit eesoxscsi_remove(struct expansion_card *ec)
+{
+        struct Scsi_Host *host = ecard_get_drvdata(ec);
+        struct eesoxscsi_info *info = (struct eesoxscsi_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);
+
+        device_remove_file(&ec->dev, &dev_attr_bus_term);
+
+        iounmap(info->base);
+
+        fas216_release(host);
+        scsi_host_put(host);
+        ecard_release_resources(ec);
+}
+
+static const struct ecard_id eesoxscsi_cids[] = {
+        { MANU_EESOX, PROD_EESOX_SCSI2 },
+        { 0xffff, 0xffff },
+};
+
+static struct ecard_driver eesoxscsi_driver = {
+        .probe          = eesoxscsi_probe,
+        .remove         = __devexit_p(eesoxscsi_remove),
+        .id_table       = eesoxscsi_cids,
+        .drv = {
+                .name           = "eesoxscsi",
+        },
+};
+
+static int __init eesox_init(void)
+{
+        return ecard_register_driver(&eesoxscsi_driver);
+}
+
+static void __exit eesox_exit(void)
+{
+        ecard_remove_driver(&eesoxscsi_driver);
+}
+
+module_init(eesox_init);
+module_exit(eesox_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
+MODULE_PARM(term, "1-8i");
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");