drivers/scsi/a4000t.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Detection routine for the NCR53c710 based Amiga SCSI Controllers for Linux.
   4  *              Amiga Technologies A4000T SCSI controller.
   5  *
   6  * Written 1997 by Alan Hourihane <alanh@fairlite.demon.co.uk>
   7  * plus modifications of the 53c7xx.c driver to support the Amiga.
   8  *
   9  * Rewritten to use 53c700.c by Kars de Jong <jongk@linux-m68k.org>
  10  */
  11
  12 #include <linux/module.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/amigahw.h>
  18 #include <asm/amigaints.h>
  19 #include <scsi/scsi_host.h>
  20 #include <scsi/scsi_transport_spi.h>
  21
  22 #include "53c700.h"
  23
  24
  25 static struct scsi_host_template a4000t_scsi_driver_template = {
  26         .name           = "A4000T builtin SCSI",
  27         .proc_name      = "A4000t",
  28         .this_id        = 7,
  29         .module         = THIS_MODULE,
  30 };
  31
  32
  33 #define A4000T_SCSI_OFFSET      0x40
  34
  35 static int __init amiga_a4000t_scsi_probe(struct platform_device *pdev)
  36 {
  37         struct resource *res;
  38         phys_addr_t scsi_addr;
  39         struct NCR_700_Host_Parameters *hostdata;
  40         struct Scsi_Host *host;
  41
  42         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  43         if (!res)
  44                 return -ENODEV;
  45
  46         if (!request_mem_region(res->start, resource_size(res),
  47                                 "A4000T builtin SCSI"))
  48                 return -EBUSY;
  49
  50         hostdata = kzalloc(sizeof(struct NCR_700_Host_Parameters),
  51                            GFP_KERNEL);
  52         if (!hostdata) {
  53                 dev_err(&pdev->dev, "Failed to allocate host data\n");
  54                 goto out_release;
  55         }
  56
  57         scsi_addr = res->start + A4000T_SCSI_OFFSET;
  58
  59         /* Fill in the required pieces of hostdata */
  60         hostdata->base = ZTWO_VADDR(scsi_addr);
  61         hostdata->clock = 50;
  62         hostdata->chip710 = 1;
  63         hostdata->dmode_extra = DMODE_FC2;
  64         hostdata->dcntl_extra = EA_710;
  65
  66         /* and register the chip */
  67         host = NCR_700_detect(&a4000t_scsi_driver_template, hostdata,
  68                               &pdev->dev);
  69         if (!host) {
  70                 dev_err(&pdev->dev,
  71                         "No host detected; board configuration problem?\n");
  72                 goto out_free;
  73         }
  74
  75         host->this_id = 7;
  76         host->base = scsi_addr;
  77         host->irq = IRQ_AMIGA_PORTS;
  78
  79         if (request_irq(host->irq, NCR_700_intr, IRQF_SHARED, "a4000t-scsi",
  80                         host)) {
  81                 dev_err(&pdev->dev, "request_irq failed\n");
  82                 goto out_put_host;
  83         }
  84
  85         platform_set_drvdata(pdev, host);
  86         scsi_scan_host(host);
  87         return 0;
  88
  89  out_put_host:
  90         scsi_host_put(host);
  91  out_free:
  92         kfree(hostdata);
  93  out_release:
  94         release_mem_region(res->start, resource_size(res));
  95         return -ENODEV;
  96 }
  97
  98 static void __exit amiga_a4000t_scsi_remove(struct platform_device *pdev)
  99 {
 100         struct Scsi_Host *host = platform_get_drvdata(pdev);
 101         struct NCR_700_Host_Parameters *hostdata = shost_priv(host);
 102         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 103
 104         scsi_remove_host(host);
 105         NCR_700_release(host);
 106         kfree(hostdata);
 107         free_irq(host->irq, host);
 108         release_mem_region(res->start, resource_size(res));
 109 }
 110
 111 /*
 112  * amiga_a4000t_scsi_remove() lives in .exit.text. For drivers registered via
 113  * module_platform_driver_probe() this is ok because they cannot get unbound at
 114  * runtime. So mark the driver struct with __refdata to prevent modpost
 115  * triggering a section mismatch warning.
 116  */
 117 static struct platform_driver amiga_a4000t_scsi_driver __refdata = {
 118         .remove_new = __exit_p(amiga_a4000t_scsi_remove),
 119         .driver   = {
 120                 .name   = "amiga-a4000t-scsi",
 121         },
 122 };
 123
 124 module_platform_driver_probe(amiga_a4000t_scsi_driver, amiga_a4000t_scsi_probe);
 125
 126 MODULE_AUTHOR("Alan Hourihane <alanh@fairlite.demon.co.uk> / "
 127               "Kars de Jong <jongk@linux-m68k.org>");
 128 MODULE_DESCRIPTION("Amiga A4000T NCR53C710 driver");
 129 MODULE_LICENSE("GPL");
 130 MODULE_ALIAS("platform:amiga-a4000t-scsi");