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/ioport.h>
   7 #include <linux/init.h>
   8 #include <linux/spinlock.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 "hosts.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 void 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;
  36         if (status & ISTR_INTS)
  37         {
  38                 spin_lock_irqsave(&io_request_lock, flags);
  39                 wd33c93_intr (a3000_host);
  40                 spin_unlock_irqrestore(&io_request_lock, flags);
  41         } else
  42                 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n",
  43                        status);
  44 }
  45
  46 static int dma_setup (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             scsi_malloc (HDATA(a3000_host)->dma_bounce_len);
  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             if (cmd->use_sg) {
  74                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  75                         cmd->SCp.ptr, cmd->SCp.this_residual);
  76             } else
  77                 memcpy (HDATA(a3000_host)->dma_bounce_buffer,
  78                         cmd->request_buffer, cmd->request_bufflen);
  79         }
  80
  81         addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
  82     }
  83
  84     /* setup dma direction */
  85     if (!dir_in)
  86         cntr |= CNTR_DDIR;
  87
  88     /* remember direction */
  89     HDATA(a3000_host)->dma_dir = dir_in;
  90
  91     DMA(a3000_host)->CNTR = cntr;
  92
  93     /* setup DMA *physical* address */
  94     DMA(a3000_host)->ACR = addr;
  95
  96     if (dir_in)
  97         /* invalidate any cache */
  98         cache_clear (addr, cmd->SCp.this_residual);
  99     else
 100         /* push any dirty cache */
 101         cache_push (addr, cmd->SCp.this_residual);
 102
 103     /* start DMA */
 104     mb();                       /* make sure setup is completed */
 105     DMA(a3000_host)->ST_DMA = 1;
 106     mb();                       /* make sure DMA has started before next IO */
 107
 108     /* return success */
 109     return 0;
 110 }
 111
 112 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 113                       int status)
 114 {
 115     /* disable SCSI interrupts */
 116     unsigned short cntr = CNTR_PDMD;
 117
 118     if (!HDATA(instance)->dma_dir)
 119         cntr |= CNTR_DDIR;
 120
 121     DMA(instance)->CNTR = cntr;
 122     mb();                       /* make sure CNTR is updated before next IO */
 123
 124     /* flush if we were reading */
 125     if (HDATA(instance)->dma_dir) {
 126         DMA(instance)->FLUSH = 1;
 127         mb();                   /* don't allow prefetch */
 128         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 129             barrier();
 130         mb();                   /* no IO until FLUSH is done */
 131     }
 132
 133     /* clear a possible interrupt */
 134     /* I think that this CINT is only necessary if you are
 135      * using the terminal count features.   HM 7 Mar 1994
 136      */
 137     DMA(instance)->CINT = 1;
 138
 139     /* stop DMA */
 140     DMA(instance)->SP_DMA = 1;
 141     mb();                       /* make sure DMA is stopped before next IO */
 142
 143     /* restore the CONTROL bits (minus the direction flag) */
 144     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 145     mb();                       /* make sure CNTR is updated before next IO */
 146
 147     /* copy from a bounce buffer, if necessary */
 148     if (status && HDATA(instance)->dma_bounce_buffer) {
 149         if (SCpnt && SCpnt->use_sg) {
 150             if (HDATA(instance)->dma_dir && SCpnt)
 151                 memcpy (SCpnt->SCp.ptr,
 152                         HDATA(instance)->dma_bounce_buffer,
 153                         SCpnt->SCp.this_residual);
 154             scsi_free (HDATA(instance)->dma_bounce_buffer,
 155                        HDATA(instance)->dma_bounce_len);
 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             scsi_free (HDATA(instance)->dma_bounce_buffer,
 165                        HDATA(instance)->dma_bounce_len);
 166             HDATA(instance)->dma_bounce_buffer = NULL;
 167             HDATA(instance)->dma_bounce_len = 0;
 168         }
 169     }
 170 }
 171
 172 int __init a3000_detect(Scsi_Host_Template *tpnt)
 173 {
 174     static unsigned char called = 0;
 175
 176     if (called)
 177         return 0;
 178
 179     if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 180         return 0;
 181     if (!request_mem_region(0xDD0000, 256, "wd33c93"))
 182         return -EBUSY;
 183
 184     tpnt->proc_name = "A3000";
 185     tpnt->proc_info = &wd33c93_proc_info;
 186
 187     a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
 188     if (a3000_host == NULL) {
 189         release_mem_region(0xDD0000, 256);
 190         return 0;
 191     }
 192     a3000_host->base = ZTWO_VADDR(0xDD0000);
 193     a3000_host->irq = IRQ_AMIGA_PORTS;
 194     DMA(a3000_host)->DAWR = DAWR_A3000;
 195     wd33c93_init(a3000_host, (wd33c93_regs *)&(DMA(a3000_host)->SASR),
 196                  dma_setup, dma_stop, WD33C93_FS_12_15);
 197     request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
 198                 a3000_intr);
 199     DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
 200     called = 1;
 201
 202     return 1;
 203 }
 204
 205 #define HOSTS_C
 206
 207 static Scsi_Host_Template driver_template = _A3000_SCSI;
 208
 209 #include "scsi_module.c"
 210
 211 int a3000_release(struct Scsi_Host *instance)
 212 {
 213 #ifdef MODULE
 214     wd33c93_release();
 215     DMA(instance)->CNTR = 0;
 216     release_mem_region(0xDD0000, 256);
 217     free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 218 #endif
 219     return 1;
 220 }