drivers/scsi/a3000.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blk.h>
   4 #include <linux/sched.h>
   5 #include <linux/version.h>
   6 #include <linux/init.h>
   7 #include <linux/spinlock.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 "hosts.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 void a3000_intr (int irq, void *dummy, struct pt_regs *fp)
  29 {
  30         unsigned long flags;
  31         unsigned int status = DMA(a3000_host)->ISTR;
  32
  33         if (!(status & ISTR_INT_P))
  34                 return;
  35         if (status & ISTR_INTS)
  36         {
  37                 spin_lock_irqsave(&io_request_lock, flags);
  38                 wd33c93_intr (a3000_host);
  39                 spin_unlock_irqrestore(&io_request_lock, flags);
  40         } else
  41                 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n",
  42                        status);
  43 }
  44
  45 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
  46 {
  47     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  48     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  49
  50     /*
  51      * if the physical address has the wrong alignment, or if
  52      * physical address is bad, or if it is a write and at the
  53      * end of a physical memory chunk, then allocate a bounce
  54      * buffer
  55      */
  56     if (addr & A3000_XFER_MASK ||
  57         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  58     {
  59         HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  60             & ~0x1ff;
  61         HDATA(a3000_host)->dma_bounce_buffer =
  62             scsi_malloc (HDATA(a3000_host)->dma_bounce_len);
  63
  64         /* can't allocate memory; use PIO */
  65         if (!HDATA(a3000_host)->dma_bounce_buffer) {
  66             HDATA(a3000_host)->dma_bounce_len = 0;
  67             return 1;
  68         }
  69
  70         if (!dir_in) {
  71             /* copy to bounce buffer for a write */
  72             if (cmd->use_sg) {
  73                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  74                         cmd->SCp.ptr, cmd->SCp.this_residual);
  75             } else
  76                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  77                         cmd->request_buffer, cmd->request_bufflen);
  78         }
  79
  80         addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
  81     }
  82
  83     /* setup dma direction */
  84     if (!dir_in)
  85         cntr |= CNTR_DDIR;
  86
  87     /* remember direction */
  88     HDATA(a3000_host)->dma_dir = dir_in;
  89
  90     DMA(a3000_host)->CNTR = cntr;
  91
  92     /* setup DMA *physical* address */
  93     DMA(a3000_host)->ACR = addr;
  94
  95     if (dir_in)
  96         /* invalidate any cache */
  97         cache_clear (addr, cmd->SCp.this_residual);
  98     else
  99         /* push any dirty cache */
 100         cache_push (addr, cmd->SCp.this_residual);
 101
 102     /* start DMA */
 103     DMA(a3000_host)->ST_DMA = 1;
 104
 105     /* return success */
 106     return 0;
 107 }
 108
 109 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 110                       int status)
 111 {
 112     /* disable SCSI interrupts */
 113     unsigned short cntr = CNTR_PDMD;
 114
 115     if (!HDATA(instance)->dma_dir)
 116         cntr |= CNTR_DDIR;
 117
 118     DMA(instance)->CNTR = cntr;
 119
 120     /* flush if we were reading */
 121     if (HDATA(instance)->dma_dir) {
 122         DMA(instance)->FLUSH = 1;
 123         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 124             ;
 125     }
 126
 127     /* clear a possible interrupt */
 128     /* I think that this CINT is only necessary if you are
 129      * using the terminal count features.   HM 7 Mar 1994
 130      */
 131     DMA(instance)->CINT = 1;
 132
 133     /* stop DMA */
 134     DMA(instance)->SP_DMA = 1;
 135
 136     /* restore the CONTROL bits (minus the direction flag) */
 137     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 138
 139     /* copy from a bounce buffer, if necessary */
 140     if (status && HDATA(instance)->dma_bounce_buffer) {
 141         if (SCpnt && SCpnt->use_sg) {
 142             if (HDATA(instance)->dma_dir && SCpnt)
 143                 memcpy (SCpnt->SCp.ptr,
 144                         HDATA(instance)->dma_bounce_buffer,
 145                         SCpnt->SCp.this_residual);
 146             scsi_free (HDATA(instance)->dma_bounce_buffer,
 147                        HDATA(instance)->dma_bounce_len);
 148             HDATA(instance)->dma_bounce_buffer = NULL;
 149             HDATA(instance)->dma_bounce_len = 0;
 150         } else {
 151             if (HDATA(instance)->dma_dir && SCpnt)
 152                 memcpy (SCpnt->request_buffer,
 153                         HDATA(instance)->dma_bounce_buffer,
 154                         SCpnt->request_bufflen);
 155
 156             scsi_free (HDATA(instance)->dma_bounce_buffer,
 157                        HDATA(instance)->dma_bounce_len);
 158             HDATA(instance)->dma_bounce_buffer = NULL;
 159             HDATA(instance)->dma_bounce_len = 0;
 160         }
 161     }
 162 }
 163
 164 int __init a3000_detect(Scsi_Host_Template *tpnt)
 165 {
 166     static unsigned char called = 0;
 167
 168     if (called)
 169         return 0;
 170
 171     if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 172         return 0;
 173
 174     tpnt->proc_name = "A3000";
 175     tpnt->proc_info = &wd33c93_proc_info;
 176
 177     a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
 178     if(a3000_host == NULL)
 179         return 0;
 180     a3000_host->base = ZTWO_VADDR(0xDD0000);
 181     a3000_host->irq = IRQ_AMIGA_PORTS;
 182     DMA(a3000_host)->DAWR = DAWR_A3000;
 183     wd33c93_init(a3000_host, (wd33c93_regs *)&(DMA(a3000_host)->SASR),
 184                  dma_setup, dma_stop, WD33C93_FS_12_15);
 185     request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
 186                 a3000_intr);
 187     DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
 188     called = 1;
 189
 190     return 1;
 191 }
 192
 193 #define HOSTS_C
 194
 195 #include "a3000.h"
 196
 197 static Scsi_Host_Template driver_template = A3000_SCSI;
 198
 199 #include "scsi_module.c"
 200
 201 int a3000_release(struct Scsi_Host *instance)
 202 {
 203 #ifdef MODULE
 204     wd33c93_release();
 205     DMA(instance)->CNTR = 0;
 206     free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 207 #endif
 208     return 1;
 209 }