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