drivers/scsi/mvme16x_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Detection routine for the NCR53c710 based MVME16x SCSI Controllers for Linux.
   4  *
   5  * Based on work by Alan Hourihane
   6  *
   7  * Rewritten to use 53c700.c by Kars de Jong <jongk@linux-m68k.org>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/slab.h>
  17 #include <asm/mvme16xhw.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_device.h>
  20 #include <scsi/scsi_transport.h>
  21 #include <scsi/scsi_transport_spi.h>
  22
  23 #include "53c700.h"
  24
  25 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
  26 MODULE_DESCRIPTION("MVME16x NCR53C710 driver");
  27 MODULE_LICENSE("GPL");
  28
  29 static struct scsi_host_template mvme16x_scsi_driver_template = {
  30         .name                   = "MVME16x NCR53c710 SCSI",
  31         .proc_name              = "MVME16x",
  32         .this_id                = 7,
  33         .module                 = THIS_MODULE,
  34 };
  35
  36 static struct platform_device *mvme16x_scsi_device;
  37
  38 static int mvme16x_probe(struct platform_device *dev)
  39 {
  40         struct Scsi_Host * host = NULL;
  41         struct NCR_700_Host_Parameters *hostdata;
  42
  43         if (!MACH_IS_MVME16x)
  44                 goto out;
  45
  46         if (mvme16x_config & MVME16x_CONFIG_NO_SCSICHIP) {
  47                 printk(KERN_INFO "mvme16x-scsi: detection disabled, "
  48                                  "SCSI chip not present\n");
  49                 goto out;
  50         }
  51
  52         hostdata = kzalloc(sizeof(struct NCR_700_Host_Parameters), GFP_KERNEL);
  53         if (hostdata == NULL) {
  54                 printk(KERN_ERR "mvme16x-scsi: "
  55                                 "Failed to allocate host data\n");
  56                 goto out;
  57         }
  58
  59         /* Fill in the required pieces of hostdata */
  60         hostdata->base = (void __iomem *)0xfff47000UL;
  61         hostdata->clock = 50;   /* XXX - depends on the CPU clock! */
  62         hostdata->chip710 = 1;
  63         hostdata->dmode_extra = DMODE_FC2;
  64         hostdata->dcntl_extra = EA_710;
  65         hostdata->ctest7_extra = CTEST7_TT1;
  66
  67         /* and register the chip */
  68         host = NCR_700_detect(&mvme16x_scsi_driver_template, hostdata,
  69                               &dev->dev);
  70         if (!host) {
  71                 printk(KERN_ERR "mvme16x-scsi: No host detected; "
  72                                 "board configuration problem?\n");
  73                 goto out_free;
  74         }
  75         host->this_id = 7;
  76         host->base = 0xfff47000UL;
  77         host->irq = MVME16x_IRQ_SCSI;
  78         if (request_irq(host->irq, NCR_700_intr, 0, "mvme16x-scsi", host)) {
  79                 printk(KERN_ERR "mvme16x-scsi: request_irq failed\n");
  80                 goto out_put_host;
  81         }
  82
  83         /* Enable scsi chip ints */
  84         {
  85                 volatile unsigned long v;
  86
  87                 /* Enable scsi interrupts at level 4 in PCCchip2 */
  88                 v = in_be32(0xfff4202c);
  89                 v = (v & ~0xff) | 0x10 | 4;
  90                 out_be32(0xfff4202c, v);
  91         }
  92
  93         platform_set_drvdata(dev, host);
  94         scsi_scan_host(host);
  95
  96         return 0;
  97
  98  out_put_host:
  99         scsi_host_put(host);
 100  out_free:
 101         kfree(hostdata);
 102  out:
 103         return -ENODEV;
 104 }
 105
 106 static int mvme16x_device_remove(struct platform_device *dev)
 107 {
 108         struct Scsi_Host *host = platform_get_drvdata(dev);
 109         struct NCR_700_Host_Parameters *hostdata = shost_priv(host);
 110
 111         /* Disable scsi chip ints */
 112         {
 113                 volatile unsigned long v;
 114
 115                 v = in_be32(0xfff4202c);
 116                 v &= ~0x10;
 117                 out_be32(0xfff4202c, v);
 118         }
 119         scsi_remove_host(host);
 120         NCR_700_release(host);
 121         kfree(hostdata);
 122         free_irq(host->irq, host);
 123
 124         return 0;
 125 }
 126
 127 static struct platform_driver mvme16x_scsi_driver = {
 128         .driver = {
 129                 .name           = "mvme16x-scsi",
 130         },
 131         .probe          = mvme16x_probe,
 132         .remove         = mvme16x_device_remove,
 133 };
 134
 135 static int __init mvme16x_scsi_init(void)
 136 {
 137         int err;
 138
 139         err = platform_driver_register(&mvme16x_scsi_driver);
 140         if (err)
 141                 return err;
 142
 143         mvme16x_scsi_device = platform_device_register_simple("mvme16x-scsi",
 144                                                               -1, NULL, 0);
 145         if (IS_ERR(mvme16x_scsi_device)) {
 146                 platform_driver_unregister(&mvme16x_scsi_driver);
 147                 return PTR_ERR(mvme16x_scsi_device);
 148         }
 149
 150         return 0;
 151 }
 152
 153 static void __exit mvme16x_scsi_exit(void)
 154 {
 155         platform_device_unregister(mvme16x_scsi_device);
 156         platform_driver_unregister(&mvme16x_scsi_driver);
 157 }
 158
 159 module_init(mvme16x_scsi_init);
 160 module_exit(mvme16x_scsi_exit);