1 files changed, 472 insertions, 0 deletions

diff --git a/drivers/scsi/arm/powertec.c b/drivers/scsi/arm/powertec.c
new file mode 100644
index 000000000000..54f23be6460f
--- /dev/null
+++ b/drivers/scsi/arm/powertec.c
@@ -0,0 +1,472 @@
+/*
+ *  linux/drivers/acorn/scsi/powertec.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.
+ */
+#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/irq.h>
+#include <asm/pgtable.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+#include "scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define POWERTEC_FAS216_OFFSET  0x3000
+#define POWERTEC_FAS216_SHIFT   6
+
+#define POWERTEC_INTR_STATUS    0x2000
+#define POWERTEC_INTR_BIT       0x80
+
+#define POWERTEC_RESET_CONTROL  0x1018
+#define POWERTEC_RESET_BIT      1
+
+#define POWERTEC_TERM_CONTROL   0x2018
+#define POWERTEC_TERM_ENABLE    1
+
+#define POWERTEC_INTR_CONTROL   0x101c
+#define POWERTEC_INTR_ENABLE    1
+#define POWERTEC_INTR_DISABLE   0
+
+#define VERSION "1.10 (19/01/2003 2.5.59)"
+
+/*
+ * Use term=0,1,0,0,0 to turn terminators on/off.
+ * One entry per slot.
+ */
+static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+#define NR_SG   256
+
+struct powertec_info {
+        FAS216_Info             info;
+        struct expansion_card   *ec;
+        void __iomem            *base;
+        unsigned int            term_ctl;
+        struct scatterlist      sg[NR_SG];
+};
+
+/* Prototype: void powertecscsi_irqenable(ec, irqnr)
+ * Purpose  : Enable interrupts on Powertec SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
+{
+        struct powertec_info *info = ec->irq_data;
+        writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
+ * Purpose  : Disable interrupts on Powertec SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
+{
+        struct powertec_info *info = ec->irq_data;
+        writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+static const expansioncard_ops_t powertecscsi_ops = {
+        .irqenable      = powertecscsi_irqenable,
+        .irqdisable     = powertecscsi_irqdisable,
+};
+
+/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
+ * Purpose  : Turn the Powertec SCSI terminators on or off
+ * Params   : host   - card to turn on/off
+ *          : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+        struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+        info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
+        writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
+}
+
+/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
+ * Purpose  : handle interrupts from Powertec SCSI card
+ * Params   : irq    - interrupt number
+ *            dev_id - user-defined (Scsi_Host structure)
+ *            regs   - processor registers at interrupt
+ */
+static irqreturn_t
+powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct powertec_info *info = dev_id;
+
+        return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t powertecscsi_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
+powertecscsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
+                       fasdmadir_t direction, fasdmatype_t min_type)
+{
+        struct powertec_info *info = (struct powertec_info *)host->hostdata;
+        struct device *dev = scsi_get_device(host);
+        int dmach = info->info.scsi.dma;
+
+        if (info->info.ifcfg.capabilities & FASCAP_DMA &&
+            min_type == fasdma_real_all) {
+                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;
+        }
+
+        /*
+         * If we're not doing DMA,
+         *  we'll do slow PIO
+         */
+        return fasdma_pio;
+}
+
+/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
+ * Purpose  : stops DMA/PIO
+ * Params   : host  - host
+ *            SCpnt - command
+ */
+static void
+powertecscsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
+{
+        struct powertec_info *info = (struct powertec_info *)host->hostdata;
+        if (info->info.scsi.dma != NO_DMA)
+                disable_dma(info->info.scsi.dma);
+}
+
+/* Prototype: const char *powertecscsi_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 *powertecscsi_info(struct Scsi_Host *host)
+{
+        struct powertec_info *info = (struct powertec_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->term_ctl ? "n" : "ff");
+
+        return string;
+}
+
+/* Prototype: int powertecscsi_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
+powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+        int ret = length;
+
+        if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
+                buffer += 12;
+                length -= 12;
+
+                if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+                        if (buffer[5] == '1')
+                                powertecscsi_terminator_ctl(host, 1);
+                        else if (buffer[5] == '0')
+                                powertecscsi_terminator_ctl(host, 0);
+                        else
+                                ret = -EINVAL;
+                } else
+                        ret = -EINVAL;
+        } else
+                ret = -EINVAL;
+
+        return ret;
+}
+
+/* Prototype: int powertecscsi_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
+ *            inout   - 0 for reading, 1 for writing.
+ * Returns  : length of data written to buffer.
+ */
+int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
+                            int length, int inout)
+{
+        struct powertec_info *info;
+        char *p = buffer;
+        int pos;
+
+        if (inout == 1)
+                return powertecscsi_set_proc_info(host, buffer, length);
+
+        info = (struct powertec_info *)host->hostdata;
+
+        p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION);
+        p += fas216_print_host(&info->info, p);
+        p += sprintf(p, "Term    : o%s\n",
+                        info->term_ctl ? "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 powertecscsi_show_term(struct device *dev, char *buf)
+{
+        struct expansion_card *ec = ECARD_DEV(dev);
+        struct Scsi_Host *host = ecard_get_drvdata(ec);
+        struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+        return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
+}
+
+static ssize_t
+powertecscsi_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);
+
+        if (len > 1)
+                powertecscsi_terminator_ctl(host, buf[0] != '0');
+
+        return len;
+}
+
+static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
+                   powertecscsi_show_term, powertecscsi_store_term);
+
+static Scsi_Host_Template powertecscsi_template = {
+        .module                         = THIS_MODULE,
+        .proc_info                      = powertecscsi_proc_info,
+        .name                           = "PowerTec SCSI",
+        .info                           = powertecscsi_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                      = 8,
+        .this_id                        = 7,
+        .sg_tablesize                   = SG_ALL,
+        .cmd_per_lun                    = 2,
+        .use_clustering                 = ENABLE_CLUSTERING,
+        .proc_name                      = "powertec",
+};
+
+static int __devinit
+powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+        struct Scsi_Host *host;
+        struct powertec_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(&powertecscsi_template,
+                               sizeof (struct powertec_info));
+        if (!host) {
+                ret = -ENOMEM;
+                goto out_unmap;
+        }
+
+        ecard_set_drvdata(ec, host);
+
+        info = (struct powertec_info *)host->hostdata;
+        info->base = base;
+        powertecscsi_terminator_ctl(host, term[ec->slot_no]);
+
+        info->info.scsi.io_base         = base + POWERTEC_FAS216_OFFSET;
+        info->info.scsi.io_shift        = POWERTEC_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   = 0;
+        info->info.dma.setup            = powertecscsi_dma_setup;
+        info->info.dma.pseudo           = NULL;
+        info->info.dma.stop             = powertecscsi_dma_stop;
+
+        ec->irqaddr     = base + POWERTEC_INTR_STATUS;
+        ec->irqmask     = POWERTEC_INTR_BIT;
+        ec->irq_data    = info;
+        ec->ops         = &powertecscsi_ops;
+
+        device_create_file(&ec->dev, &dev_attr_bus_term);
+
+        ret = fas216_init(host);
+        if (ret)
+                goto out_free;
+
+        ret = request_irq(ec->irq, powertecscsi_intr,
+                          SA_INTERRUPT, "powertec", 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, "powertec")) {
+                        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:
+        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 powertecscsi_remove(struct expansion_card *ec)
+{
+        struct Scsi_Host *host = ecard_get_drvdata(ec);
+        struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+        ecard_set_drvdata(ec, NULL);
+        fas216_remove(host);
+
+        device_remove_file(&ec->dev, &dev_attr_bus_term);
+
+        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 powertecscsi_cids[] = {
+        { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
+        { 0xffff, 0xffff },
+};
+
+static struct ecard_driver powertecscsi_driver = {
+        .probe          = powertecscsi_probe,
+        .remove         = __devexit_p(powertecscsi_remove),
+        .id_table       = powertecscsi_cids,
+        .drv = {
+                .name           = "powertecscsi",
+        },
+};
+
+static int __init powertecscsi_init(void)
+{
+        return ecard_register_driver(&powertecscsi_driver);
+}
+
+static void __exit powertecscsi_exit(void)
+{
+        ecard_remove_driver(&powertecscsi_driver);
+}
+
+module_init(powertecscsi_init);
+module_exit(powertecscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Powertec SCSI driver");
+MODULE_PARM(term, "1-8i");
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");