drivers/scsi/a3000.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/sched.h>
   5 #include <linux/ioport.h>
   6 #include <linux/init.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/interrupt.h>
   9
  10 #include <asm/setup.h>
  11 #include <asm/page.h>
  12 #include <asm/pgtable.h>
  13 #include <asm/amigaints.h>
  14 #include <asm/amigahw.h>
  15 #include <asm/irq.h>
  16
  17 #include "scsi.h"
  18 #include <scsi/scsi_host.h>
  19 #include "wd33c93.h"
  20 #include "a3000.h"
  21
  22 #include<linux/stat.h>
  23
  24 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
  25 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  26
  27 static struct Scsi_Host *a3000_host = NULL;
  28
  29 static irqreturn_t a3000_intr (int irq, void *dummy, struct pt_regs *fp)
  30 {
  31         unsigned long flags;
  32         unsigned int status = DMA(a3000_host)->ISTR;
  33
  34         if (!(status & ISTR_INT_P))
  35                 return IRQ_NONE;
  36         if (status & ISTR_INTS)
  37         {
  38                 spin_lock_irqsave(a3000_host->host_lock, flags);
  39                 wd33c93_intr (a3000_host);
  40                 spin_unlock_irqrestore(a3000_host->host_lock, flags);
  41                 return IRQ_HANDLED;
  42         }
  43         printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
  44         return IRQ_NONE;
  45 }
  46
  47 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
  48 {
  49     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  50     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  51
  52     /*
  53      * if the physical address has the wrong alignment, or if
  54      * physical address is bad, or if it is a write and at the
  55      * end of a physical memory chunk, then allocate a bounce
  56      * buffer
  57      */
  58     if (addr & A3000_XFER_MASK ||
  59         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  60     {
  61         HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  62             & ~0x1ff;
  63         HDATA(a3000_host)->dma_bounce_buffer =
  64             kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
  65
  66         /* can't allocate memory; use PIO */
  67         if (!HDATA(a3000_host)->dma_bounce_buffer) {
  68             HDATA(a3000_host)->dma_bounce_len = 0;
  69             return 1;
  70         }
  71
  72         if (!dir_in) {
  73             /* copy to bounce buffer for a write */
  74             if (cmd->use_sg) {
  75                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  76                         cmd->SCp.ptr, cmd->SCp.this_residual);
  77             } else
  78                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  79                         cmd->request_buffer, cmd->request_bufflen);
  80         }
  81
  82         addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
  83     }
  84
  85     /* setup dma direction */
  86     if (!dir_in)
  87         cntr |= CNTR_DDIR;
  88
  89     /* remember direction */
  90     HDATA(a3000_host)->dma_dir = dir_in;
  91
  92     DMA(a3000_host)->CNTR = cntr;
  93
  94     /* setup DMA *physical* address */
  95     DMA(a3000_host)->ACR = addr;
  96
  97     if (dir_in)
  98         /* invalidate any cache */
  99         cache_clear (addr, cmd->SCp.this_residual);
 100     else
 101         /* push any dirty cache */
 102         cache_push (addr, cmd->SCp.this_residual);
 103
 104     /* start DMA */
 105     mb();                       /* make sure setup is completed */
 106     DMA(a3000_host)->ST_DMA = 1;
 107     mb();                       /* make sure DMA has started before next IO */
 108
 109     /* return success */
 110     return 0;
 111 }
 112
 113 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 114                       int status)
 115 {
 116     /* disable SCSI interrupts */
 117     unsigned short cntr = CNTR_PDMD;
 118
 119     if (!HDATA(instance)->dma_dir)
 120         cntr |= CNTR_DDIR;
 121
 122     DMA(instance)->CNTR = cntr;
 123     mb();                       /* make sure CNTR is updated before next IO */
 124
 125     /* flush if we were reading */
 126     if (HDATA(instance)->dma_dir) {
 127         DMA(instance)->FLUSH = 1;
 128         mb();                   /* don't allow prefetch */
 129         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 130             barrier();
 131         mb();                   /* no IO until FLUSH is done */
 132     }
 133
 134     /* clear a possible interrupt */
 135     /* I think that this CINT is only necessary if you are
 136      * using the terminal count features.   HM 7 Mar 1994
 137      */
 138     DMA(instance)->CINT = 1;
 139
 140     /* stop DMA */
 141     DMA(instance)->SP_DMA = 1;
 142     mb();                       /* make sure DMA is stopped before next IO */
 143
 144     /* restore the CONTROL bits (minus the direction flag) */
 145     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 146     mb();                       /* make sure CNTR is updated before next IO */
 147
 148     /* copy from a bounce buffer, if necessary */
 149     if (status && HDATA(instance)->dma_bounce_buffer) {
 150         if (SCpnt && SCpnt->use_sg) {
 151             if (HDATA(instance)->dma_dir && SCpnt)
 152                 memcpy (SCpnt->SCp.ptr,
 153                         HDATA(instance)->dma_bounce_buffer,
 154                         SCpnt->SCp.this_residual);
 155             kfree (HDATA(instance)->dma_bounce_buffer);
 156             HDATA(instance)->dma_bounce_buffer = NULL;
 157             HDATA(instance)->dma_bounce_len = 0;
 158         } else {
 159             if (HDATA(instance)->dma_dir && SCpnt)
 160                 memcpy (SCpnt->request_buffer,
 161                         HDATA(instance)->dma_bounce_buffer,
 162                         SCpnt->request_bufflen);
 163
 164             kfree (HDATA(instance)->dma_bounce_buffer);
 165             HDATA(instance)->dma_bounce_buffer = NULL;
 166             HDATA(instance)->dma_bounce_len = 0;
 167         }
 168     }
 169 }
 170
 171 int __init a3000_detect(struct scsi_host_template *tpnt)
 172 {
 173     wd33c93_regs regs;
 174
 175     if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 176         return 0;
 177     if (!request_mem_region(0xDD0000, 256, "wd33c93"))
 178         return 0;
 179
 180     tpnt->proc_name = "A3000";
 181     tpnt->proc_info = &wd33c93_proc_info;
 182
 183     a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
 184     if (a3000_host == NULL)
 185         goto fail_register;
 186
 187     a3000_host->base = ZTWO_VADDR(0xDD0000);
 188     a3000_host->irq = IRQ_AMIGA_PORTS;
 189     DMA(a3000_host)->DAWR = DAWR_A3000;
 190     regs.SASR = &(DMA(a3000_host)->SASR);
 191     regs.SCMD = &(DMA(a3000_host)->SCMD);
 192     wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
 193     if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
 194                     a3000_intr))
 195         goto fail_irq;
 196     DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
 197
 198     return 1;
 199
 200 fail_irq:
 201     wd33c93_release();
 202     scsi_unregister(a3000_host);
 203 fail_register:
 204     release_mem_region(0xDD0000, 256);
 205     return 0;
 206 }
 207
 208 static int a3000_bus_reset(Scsi_Cmnd *cmd)
 209 {
 210         /* FIXME perform bus-specific reset */
 211
 212         /* FIXME 2: kill this entire function, which should
 213            cause mid-layer to call wd33c93_host_reset anyway? */
 214
 215         spin_lock_irq(cmd->device->host->host_lock);
 216         wd33c93_host_reset(cmd);
 217         spin_unlock_irq(cmd->device->host->host_lock);
 218
 219         return SUCCESS;
 220 }
 221
 222 #define HOSTS_C
 223
 224 static struct scsi_host_template driver_template = {
 225         .proc_name              = "A3000",
 226         .name                   = "Amiga 3000 built-in SCSI",
 227         .detect                 = a3000_detect,
 228         .release                = a3000_release,
 229         .queuecommand           = wd33c93_queuecommand,
 230         .eh_abort_handler       = wd33c93_abort,
 231         .eh_bus_reset_handler   = a3000_bus_reset,
 232         .eh_host_reset_handler  = wd33c93_host_reset,
 233         .can_queue              = CAN_QUEUE,
 234         .this_id                = 7,
 235         .sg_tablesize           = SG_ALL,
 236         .cmd_per_lun            = CMD_PER_LUN,
 237         .use_clustering         = ENABLE_CLUSTERING
 238 };
 239
 240
 241 #include "scsi_module.c"
 242
 243 int a3000_release(struct Scsi_Host *instance)
 244 {
 245     wd33c93_release();
 246     DMA(instance)->CNTR = 0;
 247     release_mem_region(0xDD0000, 256);
 248     free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 249     return 1;
 250 }
 251
 252 MODULE_LICENSE("GPL");