drivers/scsi/mvme147.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/mm.h>
   4 #include <linux/blkdev.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9
  10 #include <asm/page.h>
  11 #include <asm/mvme147hw.h>
  12 #include <asm/irq.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_cmnd.h>
  16 #include <scsi/scsi_device.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include "wd33c93.h"
  21 #include "mvme147.h"
  22
  23 static irqreturn_t mvme147_intr(int irq, void *data)
  24 {
  25         struct Scsi_Host *instance = data;
  26
  27         if (irq == MVME147_IRQ_SCSI_PORT)
  28                 wd33c93_intr(instance);
  29         else
  30                 m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
  31         return IRQ_HANDLED;
  32 }
  33
  34 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  35 {
  36         struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
  37         struct Scsi_Host *instance = cmd->device->host;
  38         struct WD33C93_hostdata *hdata = shost_priv(instance);
  39         unsigned char flags = 0x01;
  40         unsigned long addr = virt_to_bus(scsi_pointer->ptr);
  41
  42         /* setup dma direction */
  43         if (!dir_in)
  44                 flags |= 0x04;
  45
  46         /* remember direction */
  47         hdata->dma_dir = dir_in;
  48
  49         if (dir_in) {
  50                 /* invalidate any cache */
  51                 cache_clear(addr, scsi_pointer->this_residual);
  52         } else {
  53                 /* push any dirty cache */
  54                 cache_push(addr, scsi_pointer->this_residual);
  55         }
  56
  57         /* start DMA */
  58         m147_pcc->dma_bcr = scsi_pointer->this_residual | (1 << 24);
  59         m147_pcc->dma_dadr = addr;
  60         m147_pcc->dma_cntrl = flags;
  61
  62         /* return success */
  63         return 0;
  64 }
  65
  66 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
  67                      int status)
  68 {
  69         m147_pcc->dma_cntrl = 0;
  70 }
  71
  72 static const struct scsi_host_template mvme147_host_template = {
  73         .module                 = THIS_MODULE,
  74         .proc_name              = "MVME147",
  75         .name                   = "MVME147 built-in SCSI",
  76         .queuecommand           = wd33c93_queuecommand,
  77         .eh_abort_handler       = wd33c93_abort,
  78         .eh_host_reset_handler  = wd33c93_host_reset,
  79         .show_info              = wd33c93_show_info,
  80         .write_info             = wd33c93_write_info,
  81         .can_queue              = CAN_QUEUE,
  82         .this_id                = 7,
  83         .sg_tablesize           = SG_ALL,
  84         .cmd_per_lun            = CMD_PER_LUN,
  85         .cmd_size               = sizeof(struct scsi_pointer),
  86 };
  87
  88 static struct Scsi_Host *mvme147_shost;
  89
  90 static int __init mvme147_init(void)
  91 {
  92         wd33c93_regs regs;
  93         struct WD33C93_hostdata *hdata;
  94         int error = -ENOMEM;
  95
  96         if (!MACH_IS_MVME147)
  97                 return 0;
  98
  99         mvme147_shost = scsi_host_alloc(&mvme147_host_template,
 100                         sizeof(struct WD33C93_hostdata));
 101         if (!mvme147_shost)
 102                 goto err_out;
 103         mvme147_shost->base = 0xfffe4000;
 104         mvme147_shost->irq = MVME147_IRQ_SCSI_PORT;
 105
 106         regs.SASR = (volatile unsigned char *)0xfffe4000;
 107         regs.SCMD = (volatile unsigned char *)0xfffe4001;
 108
 109         hdata = shost_priv(mvme147_shost);
 110         hdata->no_sync = 0xff;
 111         hdata->fast = 0;
 112         hdata->dma_mode = CTRL_DMA;
 113
 114         wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 115
 116         error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
 117                         "MVME147 SCSI PORT", mvme147_shost);
 118         if (error)
 119                 goto err_unregister;
 120         error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
 121                         "MVME147 SCSI DMA", mvme147_shost);
 122         if (error)
 123                 goto err_free_irq;
 124 #if 0   /* Disabled; causes problems booting */
 125         m147_pcc->scsi_interrupt = 0x10;        /* Assert SCSI bus reset */
 126         udelay(100);
 127         m147_pcc->scsi_interrupt = 0x00;        /* Negate SCSI bus reset */
 128         udelay(2000);
 129         m147_pcc->scsi_interrupt = 0x40;        /* Clear bus reset interrupt */
 130 #endif
 131         m147_pcc->scsi_interrupt = 0x09;        /* Enable interrupt */
 132
 133         m147_pcc->dma_cntrl = 0x00;     /* ensure DMA is stopped */
 134         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
 135
 136         error = scsi_add_host(mvme147_shost, NULL);
 137         if (error)
 138                 goto err_free_irq;
 139         scsi_scan_host(mvme147_shost);
 140         return 0;
 141
 142 err_free_irq:
 143         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
 144 err_unregister:
 145         scsi_host_put(mvme147_shost);
 146 err_out:
 147         return error;
 148 }
 149
 150 static void __exit mvme147_exit(void)
 151 {
 152         scsi_remove_host(mvme147_shost);
 153
 154         /* XXX Make sure DMA is stopped! */
 155         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
 156         free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost);
 157
 158         scsi_host_put(mvme147_shost);
 159 }
 160
 161 module_init(mvme147_init);
 162 module_exit(mvme147_exit);