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
   7 #include <asm/page.h>
   8 #include <asm/pgtable.h>
   9 #include <asm/mvme147hw.h>
  10 #include <asm/irq.h>
  11
  12 #include "scsi.h"
  13 #include <scsi/scsi_host.h>
  14 #include "wd33c93.h"
  15 #include "mvme147.h"
  16
  17 #include <linux/stat.h>
  18
  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 int mvme147_detect(struct scsi_host_template *tpnt)
  69 {
  70         static unsigned char called = 0;
  71         struct Scsi_Host *instance;
  72         wd33c93_regs regs;
  73         struct WD33C93_hostdata *hdata;
  74
  75         if (!MACH_IS_MVME147 || called)
  76                 return 0;
  77         called++;
  78
  79         tpnt->proc_name = "MVME147";
  80         tpnt->show_info = wd33c93_show_info,
  81         tpnt->write_info = wd33c93_write_info,
  82
  83         instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
  84         if (!instance)
  85                 goto err_out;
  86
  87         instance->base = 0xfffe4000;
  88         instance->irq = MVME147_IRQ_SCSI_PORT;
  89         regs.SASR = (volatile unsigned char *)0xfffe4000;
  90         regs.SCMD = (volatile unsigned char *)0xfffe4001;
  91         hdata = shost_priv(instance);
  92         hdata->no_sync = 0xff;
  93         hdata->fast = 0;
  94         hdata->dma_mode = CTRL_DMA;
  95         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
  96
  97         if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0,
  98                         "MVME147 SCSI PORT", instance))
  99                 goto err_unregister;
 100         if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0,
 101                         "MVME147 SCSI DMA", instance))
 102                 goto err_free_irq;
 103 #if 0   /* Disabled; causes problems booting */
 104         m147_pcc->scsi_interrupt = 0x10;        /* Assert SCSI bus reset */
 105         udelay(100);
 106         m147_pcc->scsi_interrupt = 0x00;        /* Negate SCSI bus reset */
 107         udelay(2000);
 108         m147_pcc->scsi_interrupt = 0x40;        /* Clear bus reset interrupt */
 109 #endif
 110         m147_pcc->scsi_interrupt = 0x09;        /* Enable interrupt */
 111
 112         m147_pcc->dma_cntrl = 0x00;     /* ensure DMA is stopped */
 113         m147_pcc->dma_intr = 0x89;      /* Ack and enable ints */
 114
 115         return 1;
 116
 117 err_free_irq:
 118         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 119 err_unregister:
 120         scsi_unregister(instance);
 121 err_out:
 122         return 0;
 123 }
 124
 125 static struct scsi_host_template driver_template = {
 126         .proc_name              = "MVME147",
 127         .name                   = "MVME147 built-in SCSI",
 128         .detect                 = mvme147_detect,
 129         .release                = mvme147_release,
 130         .queuecommand           = wd33c93_queuecommand,
 131         .eh_abort_handler       = wd33c93_abort,
 132         .eh_host_reset_handler  = wd33c93_host_reset,
 133         .can_queue              = CAN_QUEUE,
 134         .this_id                = 7,
 135         .sg_tablesize           = SG_ALL,
 136         .cmd_per_lun            = CMD_PER_LUN,
 137         .use_clustering         = ENABLE_CLUSTERING
 138 };
 139
 140
 141 #include "scsi_module.c"
 142
 143 int mvme147_release(struct Scsi_Host *instance)
 144 {
 145 #ifdef MODULE
 146         /* XXX Make sure DMA is stopped! */
 147         free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 148         free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr);
 149 #endif
 150         return 1;
 151 }