drivers/scsi/a3000.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/ioport.h>
   5 #include <linux/init.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/interrupt.h>
   8
   9 #include <asm/setup.h>
  10 #include <asm/page.h>
  11 #include <asm/pgtable.h>
  12 #include <asm/amigaints.h>
  13 #include <asm/amigahw.h>
  14 #include <asm/irq.h>
  15
  16 #include "scsi.h"
  17 #include <scsi/scsi_host.h>
  18 #include "wd33c93.h"
  19 #include "a3000.h"
  20
  21 #include<linux/stat.h>
  22
  23 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
  24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  25
  26 static struct Scsi_Host *a3000_host = NULL;
  27
  28 static irqreturn_t a3000_intr (int irq, void *dummy)
  29 {
  30         unsigned long flags;
  31         unsigned int status = DMA(a3000_host)->ISTR;
  32
  33         if (!(status & ISTR_INT_P))
  34                 return IRQ_NONE;
  35         if (status & ISTR_INTS)
  36         {
  37                 spin_lock_irqsave(a3000_host->host_lock, flags);
  38                 wd33c93_intr (a3000_host);
  39                 spin_unlock_irqrestore(a3000_host->host_lock, flags);
  40                 return IRQ_HANDLED;
  41         }
  42         printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
  43         return IRQ_NONE;
  44 }
  45
  46 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  47 {
  48     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  49     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  50
  51     /*
  52      * if the physical address has the wrong alignment, or if
  53      * physical address is bad, or if it is a write and at the
  54      * end of a physical memory chunk, then allocate a bounce
  55      * buffer
  56      */
  57     if (addr & A3000_XFER_MASK ||
  58         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  59     {
  60         HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  61             & ~0x1ff;
  62         HDATA(a3000_host)->dma_bounce_buffer =
  63             kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
  64
  65         /* can't allocate memory; use PIO */
  66         if (!HDATA(a3000_host)->dma_bounce_buffer) {
  67             HDATA(a3000_host)->dma_bounce_len = 0;
  68             return 1;
  69         }
  70
  71         if (!dir_in) {
  72             /* copy to bounce buffer for a write */
  73             memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  74                 cmd->SCp.ptr, cmd->SCp.this_residual);
  75         }
  76
  77         addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
  78     }
  79
  80     /* setup dma direction */
  81     if (!dir_in)
  82         cntr |= CNTR_DDIR;
  83
  84     /* remember direction */
  85     HDATA(a3000_host)->dma_dir = dir_in;
  86
  87     DMA(a3000_host)->CNTR = cntr;
  88
  89     /* setup DMA *physical* address */
  90     DMA(a3000_host)->ACR = addr;
  91
  92     if (dir_in)
  93         /* invalidate any cache */
  94         cache_clear (addr, cmd->SCp.this_residual);
  95     else
  96         /* push any dirty cache */
  97         cache_push (addr, cmd->SCp.this_residual);
  98
  99     /* start DMA */
 100     mb();                       /* make sure setup is completed */
 101     DMA(a3000_host)->ST_DMA = 1;
 102     mb();                       /* make sure DMA has started before next IO */
 103
 104     /* return success */
 105     return 0;
 106 }
 107
 108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 109                      int status)
 110 {
 111     /* disable SCSI interrupts */
 112     unsigned short cntr = CNTR_PDMD;
 113
 114     if (!HDATA(instance)->dma_dir)
 115         cntr |= CNTR_DDIR;
 116
 117     DMA(instance)->CNTR = cntr;
 118     mb();                       /* make sure CNTR is updated before next IO */
 119
 120     /* flush if we were reading */
 121     if (HDATA(instance)->dma_dir) {
 122         DMA(instance)->FLUSH = 1;
 123         mb();                   /* don't allow prefetch */
 124         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 125             barrier();
 126         mb();                   /* no IO until FLUSH is done */
 127     }
 128
 129     /* clear a possible interrupt */
 130     /* I think that this CINT is only necessary if you are
 131      * using the terminal count features.   HM 7 Mar 1994
 132      */
 133     DMA(instance)->CINT = 1;
 134
 135     /* stop DMA */
 136     DMA(instance)->SP_DMA = 1;
 137     mb();                       /* make sure DMA is stopped before next IO */
 138
 139     /* restore the CONTROL bits (minus the direction flag) */
 140     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 141     mb();                       /* make sure CNTR is updated before next IO */
 142
 143     /* copy from a bounce buffer, if necessary */
 144     if (status && HDATA(instance)->dma_bounce_buffer) {
 145         if (SCpnt) {
 146             if (HDATA(instance)->dma_dir && SCpnt)
 147                 memcpy (SCpnt->SCp.ptr,
 148                         HDATA(instance)->dma_bounce_buffer,
 149                         SCpnt->SCp.this_residual);
 150             kfree (HDATA(instance)->dma_bounce_buffer);
 151             HDATA(instance)->dma_bounce_buffer = NULL;
 152             HDATA(instance)->dma_bounce_len = 0;
 153         } else {
 154             kfree (HDATA(instance)->dma_bounce_buffer);
 155             HDATA(instance)->dma_bounce_buffer = NULL;
 156             HDATA(instance)->dma_bounce_len = 0;
 157         }
 158     }
 159 }
 160
 161 int __init a3000_detect(struct scsi_host_template *tpnt)
 162 {
 163     wd33c93_regs regs;
 164
 165     if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 166         return 0;
 167     if (!request_mem_region(0xDD0000, 256, "wd33c93"))
 168         return 0;
 169
 170     tpnt->proc_name = "A3000";
 171     tpnt->proc_info = &wd33c93_proc_info;
 172
 173     a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
 174     if (a3000_host == NULL)
 175         goto fail_register;
 176
 177     a3000_host->base = ZTWO_VADDR(0xDD0000);
 178     a3000_host->irq = IRQ_AMIGA_PORTS;
 179     DMA(a3000_host)->DAWR = DAWR_A3000;
 180     regs.SASR = &(DMA(a3000_host)->SASR);
 181     regs.SCMD = &(DMA(a3000_host)->SCMD);
 182     wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
 183     if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
 184                     a3000_intr))
 185         goto fail_irq;
 186     DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
 187
 188     return 1;
 189
 190 fail_irq:
 191     wd33c93_release();
 192     scsi_unregister(a3000_host);
 193 fail_register:
 194     release_mem_region(0xDD0000, 256);
 195     return 0;
 196 }
 197
 198 static int a3000_bus_reset(struct scsi_cmnd *cmd)
 199 {
 200         /* FIXME perform bus-specific reset */
 201
 202         /* FIXME 2: kill this entire function, which should
 203            cause mid-layer to call wd33c93_host_reset anyway? */
 204
 205         spin_lock_irq(cmd->device->host->host_lock);
 206         wd33c93_host_reset(cmd);
 207         spin_unlock_irq(cmd->device->host->host_lock);
 208
 209         return SUCCESS;
 210 }
 211
 212 #define HOSTS_C
 213
 214 static struct scsi_host_template driver_template = {
 215         .proc_name              = "A3000",
 216         .name                   = "Amiga 3000 built-in SCSI",
 217         .detect                 = a3000_detect,
 218         .release                = a3000_release,
 219         .queuecommand           = wd33c93_queuecommand,
 220         .eh_abort_handler       = wd33c93_abort,
 221         .eh_bus_reset_handler   = a3000_bus_reset,
 222         .eh_host_reset_handler  = wd33c93_host_reset,
 223         .can_queue              = CAN_QUEUE,
 224         .this_id                = 7,
 225         .sg_tablesize           = SG_ALL,
 226         .cmd_per_lun            = CMD_PER_LUN,
 227         .use_clustering         = ENABLE_CLUSTERING
 228 };
 229
 230
 231 #include "scsi_module.c"
 232
 233 int a3000_release(struct Scsi_Host *instance)
 234 {
 235     wd33c93_release();
 236     DMA(instance)->CNTR = 0;
 237     release_mem_region(0xDD0000, 256);
 238     free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 239     return 1;
 240 }
 241
 242 MODULE_LICENSE("GPL");