drivers/scsi/zalon.c

   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
  17 MODULE_AUTHOR("Richard Hirst");
  18 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
  19 MODULE_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
  39 static 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
  59 static u8 iodc_data[32] __attribute__ ((aligned (64)));
  60 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
  61
  62 static int
  63 lasi_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
  80 static struct scsi_host_template zalon7xx_template = {
  81         .module         = THIS_MODULE,
  82         .proc_name      = "zalon7xx",
  83 };
  84
  85 static int __init
  86 zalon_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
 163 static const struct parisc_device_id zalon_tbl[] __initconst = {
 164         { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
 165         { 0, }
 166 };
 167
 168 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
 169
 170 static 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
 181 static struct parisc_driver zalon_driver __refdata = {
 182         .name =         "zalon",
 183         .id_table =     zalon_tbl,
 184         .probe =        zalon_probe,
 185         .remove =       __exit_p(zalon_remove),
 186 };
 187
 188 static 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
 198 static void __exit zalon7xx_exit(void)
 199 {
 200         unregister_parisc_driver(&zalon_driver);
 201         ncr53c8xx_exit();
 202 }
 203
 204 module_init(zalon7xx_init);
 205 module_exit(zalon7xx_exit);