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
   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
  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
  68int 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
 117err_free_irq:
 118        free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr);
 119err_unregister:
 120        scsi_unregister(instance);
 121err_out:
 122        return 0;
 123}
 124
 125static 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
 143int 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}
 152