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