drivers/scsi/a3000.c

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