linux/drivers/scsi/mvme147.c
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   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
  19static 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
  30static 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
  61static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
  62                     int status)
  63{
  64        m147_pcc->dma_cntrl = 0;
  65}
  66
  67static 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
  82static struct Scsi_Host *mvme147_shost;
  83
  84static 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
 136err_free_irq:
 137        free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
 138err_unregister:
 139        scsi_host_put(mvme147_shost);
 140err_out:
 141        return error;
 142}
 143
 144static 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
 155module_init(mvme147_init);
 156module_exit(mvme147_exit);
 157