drivers/scsi/zalon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Zalon 53c7xx device driver.
   4  * By Richard Hirst (rhirst@linuxcare.com)
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <asm/hardware.h>
  12 #include <asm/io.h>
  13
  14 #include "../parisc/gsc.h"
  15
  16 #include "ncr53c8xx.h"
  17
  18 MODULE_AUTHOR("Richard Hirst");
  19 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
  20 MODULE_LICENSE("GPL");
  21
  22 #define GSC_SCSI_ZALON_OFFSET 0x800
  23
  24 #define IO_MODULE_EIM           (1*4)
  25 #define IO_MODULE_DC_ADATA      (2*4)
  26 #define IO_MODULE_II_CDATA      (3*4)
  27 #define IO_MODULE_IO_COMMAND    (12*4)
  28 #define IO_MODULE_IO_STATUS     (13*4)
  29
  30 #define IOSTATUS_RY             0x40
  31 #define IOSTATUS_FE             0x80
  32 #define IOIIDATA_SMINT5L        0x40000000
  33 #define IOIIDATA_MINT5EN        0x20000000
  34 #define IOIIDATA_PACKEN         0x10000000
  35 #define IOIIDATA_PREFETCHEN     0x08000000
  36 #define IOIIDATA_IOII           0x00000020
  37
  38 #define CMD_RESET               5
  39
  40 static struct ncr_chip zalon720_chip __initdata = {
  41         .revision_id =  0x0f,
  42         .burst_max =    3,
  43         .offset_max =   8,
  44         .nr_divisor =   4,
  45         .features =     FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
  46 };
  47
  48
  49
  50 #if 0
  51 /* FIXME:
  52  * Is this function dead code? or is someone planning on using it in the
  53  * future.  The clock = (int) pdc_result[16] does not look correct to
  54  * me ... I think it should be iodc_data[16].  Since this cause a compile
  55  * error with the new encapsulated PDC, I'm not compiling in this function.
  56  * - RB
  57  */
  58 /* poke SCSI clock out of iodc data */
  59
  60 static u8 iodc_data[32] __attribute__ ((aligned (64)));
  61 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
  62
  63 static int
  64 lasi_scsi_clock(void * hpa, int defaultclock)
  65 {
  66         int clock, status;
  67
  68         status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
  69         if (status == PDC_RET_OK) {
  70                 clock = (int) pdc_result[16];
  71         } else {
  72                 printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status);
  73                 clock = defaultclock;
  74         }
  75
  76         printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock);
  77         return clock;
  78 }
  79 #endif
  80
  81 static struct scsi_host_template zalon7xx_template = {
  82         .module         = THIS_MODULE,
  83         .proc_name      = "zalon7xx",
  84 };
  85
  86 static int __init
  87 zalon_probe(struct parisc_device *dev)
  88 {
  89         struct gsc_irq gsc_irq;
  90         u32 zalon_vers;
  91         int error = -ENODEV;
  92         void __iomem *zalon = ioremap(dev->hpa.start, 4096);
  93         void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET;
  94         static int unit = 0;
  95         struct Scsi_Host *host;
  96         struct ncr_device device;
  97
  98         __raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
  99         while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
 100                 cpu_relax();
 101         __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
 102                 zalon + IO_MODULE_II_CDATA);
 103
 104         /* XXX: Save the Zalon version for bug workarounds? */
 105         zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07;
 106
 107         /* Setup the interrupts first.
 108         ** Later on request_irq() will register the handler.
 109         */
 110         dev->irq = gsc_alloc_irq(&gsc_irq);
 111
 112         printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
 113                 zalon_vers, dev->irq);
 114
 115         __raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM);
 116
 117         if (zalon_vers == 0)
 118                 printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__);
 119
 120         memset(&device, 0, sizeof(struct ncr_device));
 121
 122         /* The following three are needed before any other access. */
 123         __raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
 124         __raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
 125         __raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
 126
 127         /* Initialise ncr_device structure with items required by ncr_attach. */
 128         device.chip             = zalon720_chip;
 129         device.host_id          = 7;
 130         device.dev              = &dev->dev;
 131         device.slot.base        = dev->hpa.start + GSC_SCSI_ZALON_OFFSET;
 132         device.slot.base_v      = io_port;
 133         device.slot.irq         = dev->irq;
 134         device.differential     = 2;
 135
 136         host = ncr_attach(&zalon7xx_template, unit, &device);
 137         if (!host)
 138                 return -ENODEV;
 139
 140         if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
 141           dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",
 142                      dev->irq);
 143                 goto fail;
 144         }
 145
 146         unit++;
 147
 148         dev_set_drvdata(&dev->dev, host);
 149
 150         error = scsi_add_host(host, &dev->dev);
 151         if (error)
 152                 goto fail_free_irq;
 153
 154         scsi_scan_host(host);
 155         return 0;
 156
 157  fail_free_irq:
 158         free_irq(dev->irq, host);
 159  fail:
 160         ncr53c8xx_release(host);
 161         return error;
 162 }
 163
 164 static const struct parisc_device_id zalon_tbl[] __initconst = {
 165         { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
 166         { 0, }
 167 };
 168
 169 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
 170
 171 static int __exit zalon_remove(struct parisc_device *dev)
 172 {
 173         struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
 174
 175         scsi_remove_host(host);
 176         ncr53c8xx_release(host);
 177         free_irq(dev->irq, host);
 178
 179         return 0;
 180 }
 181
 182 static struct parisc_driver zalon_driver __refdata = {
 183         .name =         "zalon",
 184         .id_table =     zalon_tbl,
 185         .probe =        zalon_probe,
 186         .remove =       __exit_p(zalon_remove),
 187 };
 188
 189 static int __init zalon7xx_init(void)
 190 {
 191         int ret = ncr53c8xx_init();
 192         if (!ret)
 193                 ret = register_parisc_driver(&zalon_driver);
 194         if (ret)
 195                 ncr53c8xx_exit();
 196         return ret;
 197 }
 198
 199 static void __exit zalon7xx_exit(void)
 200 {
 201         unregister_parisc_driver(&zalon_driver);
 202         ncr53c8xx_exit();
 203 }
 204
 205 module_init(zalon7xx_init);
 206 module_exit(zalon7xx_exit);