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