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
  25 #define DMA(ptr)        ((a3000_scsiregs *)((ptr)->base))
  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                 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         struct WD33C93_hostdata *hdata = shost_priv(a3000_host);
  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                 hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  62                 hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
  63                                                    GFP_KERNEL);
  64
  65                 /* can't allocate memory; use PIO */
  66                 if (!hdata->dma_bounce_buffer) {
  67                         hdata->dma_bounce_len = 0;
  68                         return 1;
  69                 }
  70
  71                 if (!dir_in) {
  72                         /* copy to bounce buffer for a write */
  73                         memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
  74                                cmd->SCp.this_residual);
  75                 }
  76
  77                 addr = virt_to_bus(hdata->dma_bounce_buffer);
  78         }
  79
  80         /* setup dma direction */
  81         if (!dir_in)
  82                 cntr |= CNTR_DDIR;
  83
  84         /* remember direction */
  85         hdata->dma_dir = dir_in;
  86
  87         DMA(a3000_host)->CNTR = cntr;
  88
  89         /* setup DMA *physical* address */
  90         DMA(a3000_host)->ACR = addr;
  91
  92         if (dir_in) {
  93                 /* invalidate any cache */
  94                 cache_clear(addr, cmd->SCp.this_residual);
  95         } else {
  96                 /* push any dirty cache */
  97                 cache_push(addr, cmd->SCp.this_residual);
  98         }
  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         struct WD33C93_hostdata *hdata = shost_priv(instance);
 113
 114         /* disable SCSI interrupts */
 115         unsigned short cntr = CNTR_PDMD;
 116
 117         if (!hdata->dma_dir)
 118                 cntr |= CNTR_DDIR;
 119
 120         DMA(instance)->CNTR = cntr;
 121         mb();                   /* make sure CNTR is updated before next IO */
 122
 123         /* flush if we were reading */
 124         if (hdata->dma_dir) {
 125                 DMA(instance)->FLUSH = 1;
 126                 mb();           /* don't allow prefetch */
 127                 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 128                         barrier();
 129                 mb();           /* no IO until FLUSH is done */
 130         }
 131
 132         /* clear a possible interrupt */
 133         /* I think that this CINT is only necessary if you are
 134          * using the terminal count features.   HM 7 Mar 1994
 135          */
 136         DMA(instance)->CINT = 1;
 137
 138         /* stop DMA */
 139         DMA(instance)->SP_DMA = 1;
 140         mb();                   /* make sure DMA is stopped before next IO */
 141
 142         /* restore the CONTROL bits (minus the direction flag) */
 143         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 144         mb();                   /* make sure CNTR is updated before next IO */
 145
 146         /* copy from a bounce buffer, if necessary */
 147         if (status && hdata->dma_bounce_buffer) {
 148                 if (SCpnt) {
 149                         if (hdata->dma_dir && SCpnt)
 150                                 memcpy(SCpnt->SCp.ptr,
 151                                        hdata->dma_bounce_buffer,
 152                                        SCpnt->SCp.this_residual);
 153                         kfree(hdata->dma_bounce_buffer);
 154                         hdata->dma_bounce_buffer = NULL;
 155                         hdata->dma_bounce_len = 0;
 156                 } else {
 157                         kfree(hdata->dma_bounce_buffer);
 158                         hdata->dma_bounce_buffer = NULL;
 159                         hdata->dma_bounce_len = 0;
 160                 }
 161         }
 162 }
 163
 164 static int __init a3000_detect(struct scsi_host_template *tpnt)
 165 {
 166         wd33c93_regs regs;
 167         struct WD33C93_hostdata *hdata;
 168
 169         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 170                 return 0;
 171         if (!request_mem_region(0xDD0000, 256, "wd33c93"))
 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                 goto fail_register;
 180
 181         a3000_host->base = ZTWO_VADDR(0xDD0000);
 182         a3000_host->irq = IRQ_AMIGA_PORTS;
 183         DMA(a3000_host)->DAWR = DAWR_A3000;
 184         regs.SASR = &(DMA(a3000_host)->SASR);
 185         regs.SCMD = &(DMA(a3000_host)->SCMD);
 186         hdata = shost_priv(a3000_host);
 187         hdata->no_sync = 0xff;
 188         hdata->fast = 0;
 189         hdata->dma_mode = CTRL_DMA;
 190         wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
 191         if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
 192                         a3000_intr))
 193                 goto fail_irq;
 194         DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
 195
 196         return 1;
 197
 198 fail_irq:
 199         scsi_unregister(a3000_host);
 200 fail_register:
 201         release_mem_region(0xDD0000, 256);
 202         return 0;
 203 }
 204
 205 static int a3000_bus_reset(struct scsi_cmnd *cmd)
 206 {
 207         /* FIXME perform bus-specific reset */
 208
 209         /* FIXME 2: kill this entire function, which should
 210            cause mid-layer to call wd33c93_host_reset anyway? */
 211
 212         spin_lock_irq(cmd->device->host->host_lock);
 213         wd33c93_host_reset(cmd);
 214         spin_unlock_irq(cmd->device->host->host_lock);
 215
 216         return SUCCESS;
 217 }
 218
 219 #define HOSTS_C
 220
 221 static struct scsi_host_template driver_template = {
 222         .proc_name              = "A3000",
 223         .name                   = "Amiga 3000 built-in SCSI",
 224         .detect                 = a3000_detect,
 225         .release                = a3000_release,
 226         .queuecommand           = wd33c93_queuecommand,
 227         .eh_abort_handler       = wd33c93_abort,
 228         .eh_bus_reset_handler   = a3000_bus_reset,
 229         .eh_host_reset_handler  = wd33c93_host_reset,
 230         .can_queue              = CAN_QUEUE,
 231         .this_id                = 7,
 232         .sg_tablesize           = SG_ALL,
 233         .cmd_per_lun            = CMD_PER_LUN,
 234         .use_clustering         = ENABLE_CLUSTERING
 235 };
 236
 237
 238 #include "scsi_module.c"
 239
 240 static int a3000_release(struct Scsi_Host *instance)
 241 {
 242         DMA(instance)->CNTR = 0;
 243         release_mem_region(0xDD0000, 256);
 244         free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 245         return 1;
 246 }
 247
 248 MODULE_LICENSE("GPL");