LXR linux/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
  20static 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
  31static 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
  62static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
  63                     int status)
  64{
  65        m147_pcc->dma_cntrl = 0;
  66}
  67
  68static 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
  83static struct Scsi_Host *mvme147_shost;
  84
  85static 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
 137err_free_irq:
 138        free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost);
 139err_unregister:
 140        scsi_host_put(mvme147_shost);
 141err_out:
 142        return error;
 143}
 144
 145static 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
 156module_init(mvme147_init);
 157module_exit(mvme147_exit);
 158