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