linux/drivers/scsi/zalon.c
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   1/*
   2 * Zalon 53c7xx device driver.
   3 * By Richard Hirst (rhirst@linuxcare.com)
   4 */
   5
   6#include <linux/init.h>
   7#include <linux/interrupt.h>
   8#include <linux/module.h>
   9#include <linux/types.h>
  10#include <asm/hardware.h>
  11#include <asm/io.h>
  12
  13#include "../parisc/gsc.h"
  14
  15#include "ncr53c8xx.h"
  16
  17MODULE_AUTHOR("Richard Hirst");
  18MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
  19MODULE_LICENSE("GPL");
  20
  21#define GSC_SCSI_ZALON_OFFSET 0x800
  22
  23#define IO_MODULE_EIM           (1*4)
  24#define IO_MODULE_DC_ADATA      (2*4)
  25#define IO_MODULE_II_CDATA      (3*4)
  26#define IO_MODULE_IO_COMMAND    (12*4)
  27#define IO_MODULE_IO_STATUS     (13*4)
  28
  29#define IOSTATUS_RY             0x40
  30#define IOSTATUS_FE             0x80
  31#define IOIIDATA_SMINT5L        0x40000000
  32#define IOIIDATA_MINT5EN        0x20000000
  33#define IOIIDATA_PACKEN         0x10000000
  34#define IOIIDATA_PREFETCHEN     0x08000000
  35#define IOIIDATA_IOII           0x00000020
  36
  37#define CMD_RESET               5
  38
  39static struct ncr_chip zalon720_chip __initdata = {
  40        .revision_id =  0x0f,
  41        .burst_max =    3,
  42        .offset_max =   8,
  43        .nr_divisor =   4,
  44        .features =     FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
  45};
  46
  47
  48
  49#if 0
  50/* FIXME:
  51 * Is this function dead code? or is someone planning on using it in the
  52 * future.  The clock = (int) pdc_result[16] does not look correct to
  53 * me ... I think it should be iodc_data[16].  Since this cause a compile
  54 * error with the new encapsulated PDC, I'm not compiling in this function.
  55 * - RB
  56 */
  57/* poke SCSI clock out of iodc data */
  58
  59static u8 iodc_data[32] __attribute__ ((aligned (64)));
  60static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
  61
  62static int 
  63lasi_scsi_clock(void * hpa, int defaultclock)
  64{
  65        int clock, status;
  66
  67        status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
  68        if (status == PDC_RET_OK) {
  69                clock = (int) pdc_result[16];
  70        } else {
  71                printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status);
  72                clock = defaultclock; 
  73        }
  74
  75        printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock);
  76        return clock;
  77}
  78#endif
  79
  80static struct scsi_host_template zalon7xx_template = {
  81        .module         = THIS_MODULE,
  82        .proc_name      = "zalon7xx",
  83};
  84
  85static int __init
  86zalon_probe(struct parisc_device *dev)
  87{
  88        struct gsc_irq gsc_irq;
  89        u32 zalon_vers;
  90        int error = -ENODEV;
  91        void __iomem *zalon = ioremap_nocache(dev->hpa.start, 4096);
  92        void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET;
  93        static int unit = 0;
  94        struct Scsi_Host *host;
  95        struct ncr_device device;
  96
  97        __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
  98        while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
  99                cpu_relax();
 100        __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
 101                zalon + IO_MODULE_II_CDATA);
 102
 103        /* XXX: Save the Zalon version for bug workarounds? */
 104        zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07;
 105
 106        /* Setup the interrupts first.
 107        ** Later on request_irq() will register the handler.
 108        */
 109        dev->irq = gsc_alloc_irq(&gsc_irq);
 110
 111        printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
 112                zalon_vers, dev->irq);
 113
 114        __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM);
 115
 116        if (zalon_vers == 0)
 117                printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__);
 118
 119        memset(&device, 0, sizeof(struct ncr_device));
 120
 121        /* The following three are needed before any other access. */
 122        __raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
 123        __raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
 124        __raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
 125
 126        /* Initialise ncr_device structure with items required by ncr_attach. */
 127        device.chip             = zalon720_chip;
 128        device.host_id          = 7;
 129        device.dev              = &dev->dev;
 130        device.slot.base        = dev->hpa.start + GSC_SCSI_ZALON_OFFSET;
 131        device.slot.base_v      = io_port;
 132        device.slot.irq         = dev->irq;
 133        device.differential     = 2;
 134
 135        host = ncr_attach(&zalon7xx_template, unit, &device);
 136        if (!host)
 137                return -ENODEV;
 138
 139        if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
 140          dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",
 141                     dev->irq);
 142                goto fail;
 143        }
 144
 145        unit++;
 146
 147        dev_set_drvdata(&dev->dev, host);
 148
 149        error = scsi_add_host(host, &dev->dev);
 150        if (error)
 151                goto fail_free_irq;
 152
 153        scsi_scan_host(host);
 154        return 0;
 155
 156 fail_free_irq:
 157        free_irq(dev->irq, host);
 158 fail:
 159        ncr53c8xx_release(host);
 160        return error;
 161}
 162
 163static struct parisc_device_id zalon_tbl[] = {
 164        { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 }, 
 165        { 0, }
 166};
 167
 168MODULE_DEVICE_TABLE(parisc, zalon_tbl);
 169
 170static int __exit zalon_remove(struct parisc_device *dev)
 171{
 172        struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
 173
 174        scsi_remove_host(host);
 175        ncr53c8xx_release(host);
 176        free_irq(dev->irq, host);
 177
 178        return 0;
 179}
 180
 181static struct parisc_driver zalon_driver = {
 182        .name =         "zalon",
 183        .id_table =     zalon_tbl,
 184        .probe =        zalon_probe,
 185        .remove =       __devexit_p(zalon_remove),
 186};
 187
 188static int __init zalon7xx_init(void)
 189{
 190        int ret = ncr53c8xx_init();
 191        if (!ret)
 192                ret = register_parisc_driver(&zalon_driver);
 193        if (ret)
 194                ncr53c8xx_exit();
 195        return ret;
 196}
 197
 198static void __exit zalon7xx_exit(void)
 199{
 200        unregister_parisc_driver(&zalon_driver);
 201        ncr53c8xx_exit();
 202}
 203
 204module_init(zalon7xx_init);
 205module_exit(zalon7xx_exit);
 206
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