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/types.h>
   8 #include <linux/stat.h>
   9 #include <linux/mm.h>
  10 #include <linux/blk.h>
  11 #include <linux/sched.h>
  12 #include <linux/version.h>
  13 #include <linux/config.h>
  14 #include <linux/module.h>
  15
  16 #include <asm/page.h>
  17 #include <asm/pgtable.h>
  18 #include <asm/irq.h>
  19 #include <asm/hardware.h>
  20 #include <asm/delay.h>
  21 #include <asm/io.h>
  22
  23 #include "../parisc/gsc.h"
  24 #include "scsi.h"
  25 #include "hosts.h"
  26
  27 #include "ncr53c8xx.h"
  28
  29 #include "zalon.h"
  30
  31 MODULE_AUTHOR("Richard Hirst");
  32 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
  33 MODULE_LICENSE("GPL");
  34
  35 static ncr_chip zalon720_chip __initdata = {
  36         .device_id =    PSEUDO_720_ID,
  37         .revision_id =  0x0f,
  38         .name =         "720",
  39         .burst_max =    3,
  40         .offset_max =   8,
  41         .nr_divisor =   4,
  42         .features =     FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
  43 };
  44
  45
  46
  47 #if 0
  48 /* FIXME:
  49  * Is this function dead code? or is someone planning on using it in the
  50  * future.  The clock = (int) pdc_result[16] does not look correct to
  51  * me ... I think it should be iodc_data[16].  Since this cause a compile
  52  * error with the new encapsulated PDC, I'm not compiling in this function.
  53  * - RB
  54  */
  55 /* poke SCSI clock out of iodc data */
  56
  57 static u8 iodc_data[32] __attribute__ ((aligned (64)));
  58 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
  59
  60 static int
  61 lasi_scsi_clock(void * hpa, int defaultclock)
  62 {
  63         int clock, status;
  64
  65         status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
  66         if (status == PDC_RET_OK) {
  67                 clock = (int) pdc_result[16];
  68         } else {
  69                 printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __FUNCTION__, status);
  70                 clock = defaultclock;
  71         }
  72
  73         printk(KERN_DEBUG "%s: SCSI clock %d\n", __FUNCTION__, clock);
  74         return clock;
  75 }
  76 #endif
  77
  78 static Scsi_Host_Template zalon7xx_template = {
  79         .module         = THIS_MODULE,
  80         .proc_name      = "zalon7xx",
  81 };
  82
  83 static int __init
  84 zalon_scsi_callback(struct parisc_device *dev)
  85 {
  86         struct gsc_irq gsc_irq;
  87         u32 zalon_vers;
  88         int irq;
  89         unsigned long zalon = dev->hpa;
  90         unsigned long io_port = zalon + GSC_SCSI_ZALON_OFFSET;
  91         static int unit = 0;
  92         struct Scsi_Host *host;
  93         ncr_device device;
  94
  95         __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
  96         while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
  97                 ;
  98         __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
  99                 zalon + IO_MODULE_II_CDATA);
 100
 101         /* XXX: Save the Zalon version for bug workarounds? */
 102         zalon_vers = __raw_readl(dev->hpa + IO_MODULE_II_CDATA) & 0x07000000;
 103         zalon_vers >>= 24;
 104
 105         /* Setup the interrupts first.
 106         ** Later on request_irq() will register the handler.
 107         */
 108         irq = gsc_alloc_irq(&gsc_irq);
 109
 110         printk("%s: Zalon vers field is 0x%x, IRQ %d\n", __FUNCTION__,
 111                 zalon_vers, irq);
 112
 113         __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, dev->hpa + IO_MODULE_EIM);
 114
 115         if ( zalon_vers == 0)
 116                 printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __FUNCTION__);
 117
 118         memset(&device, 0, sizeof(ncr_device));
 119
 120         /* The following three are needed before any other access. */
 121         writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
 122         writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
 123         writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
 124
 125         /* Initialise ncr_device structure with items required by ncr_attach. */
 126         device.chip             = zalon720_chip;
 127         device.host_id          = 7;
 128         device.dev              = &dev->dev;
 129         device.slot.base        = (u_long)io_port;
 130         device.slot.base_c      = (u_long)io_port;
 131         device.slot.irq         = irq;
 132         device.differential     = 2;
 133
 134         host = ncr_attach(&zalon7xx_template, unit, &device);
 135         if(!host)
 136                 goto fail;
 137
 138         strlcpy(dev->dev.name, "zalon7xx", sizeof(dev->dev.name));
 139
 140         if(request_irq(irq, ncr53c8xx_intr, SA_SHIRQ, dev->dev.name, host)) {
 141                 printk(KERN_ERR "%s: irq problem with %d, detaching\n ",
 142                        dev->dev.name, irq);
 143                 goto fail;
 144         }
 145
 146         unit++;
 147
 148         dev_set_drvdata(&dev->dev, host);
 149
 150         scsi_add_host(host, &dev->dev);
 151
 152         return 0;
 153  fail:
 154         return -ENODEV;
 155 }
 156
 157 static struct parisc_device_id zalon_tbl[] = {
 158         { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
 159         { 0, }
 160 };
 161
 162 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
 163
 164 static int __exit zalon_remove(struct parisc_device *dev)
 165 {
 166         struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
 167         int irq = host->irq;
 168
 169         scsi_remove_host(host);
 170         ncr53c8xx_release(host);
 171         free_irq(irq, host);
 172
 173         return 0;
 174 }
 175
 176
 177 static struct parisc_driver zalon_driver = {
 178         .name =         "GSC SCSI (Zalon)",
 179         .id_table =     zalon_tbl,
 180         .probe =        zalon_scsi_callback,
 181         .remove =       __devexit_p(zalon_remove),
 182 };
 183
 184 static int __init zalon7xx_init(void)
 185 {
 186         return register_parisc_driver(&zalon_driver);
 187 }
 188
 189 static void __exit zalon7xx_exit(void)
 190 {
 191         unregister_parisc_driver(&zalon_driver);
 192 }
 193
 194 module_init(zalon7xx_init);
 195 module_exit(zalon7xx_exit);