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 static int a3000_release(struct Scsi_Host *instance);
  26
  27 static irqreturn_t a3000_intr(int irq, void *data)
  28 {
  29         struct Scsi_Host *instance = data;
  30         struct a3000_scsiregs *regs = (struct a3000_scsiregs *)(instance->base);
  31         unsigned int status = regs->ISTR;
  32         unsigned long flags;
  33
  34         if (!(status & ISTR_INT_P))
  35                 return IRQ_NONE;
  36         if (status & ISTR_INTS) {
  37                 spin_lock_irqsave(instance->host_lock, flags);
  38                 wd33c93_intr(instance);
  39                 spin_unlock_irqrestore(instance->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         struct Scsi_Host *instance = cmd->device->host;
  49         struct WD33C93_hostdata *hdata = shost_priv(instance);
  50         struct a3000_scsiregs *regs = (struct a3000_scsiregs *)(instance->base);
  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         regs->CNTR = cntr;
  88
  89         /* setup DMA *physical* address */
  90         regs->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         regs->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         struct a3000_scsiregs *regs = (struct a3000_scsiregs *)(instance->base);
 114
 115         /* disable SCSI interrupts */
 116         unsigned short cntr = CNTR_PDMD;
 117
 118         if (!hdata->dma_dir)
 119                 cntr |= CNTR_DDIR;
 120
 121         regs->CNTR = cntr;
 122         mb();                   /* make sure CNTR is updated before next IO */
 123
 124         /* flush if we were reading */
 125         if (hdata->dma_dir) {
 126                 regs->FLUSH = 1;
 127                 mb();           /* don't allow prefetch */
 128                 while (!(regs->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         regs->CINT = 1;
 138
 139         /* stop DMA */
 140         regs->SP_DMA = 1;
 141         mb();                   /* make sure DMA is stopped before next IO */
 142
 143         /* restore the CONTROL bits (minus the direction flag) */
 144         regs->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->dma_bounce_buffer) {
 149                 if (SCpnt) {
 150                         if (hdata->dma_dir && SCpnt)
 151                                 memcpy(SCpnt->SCp.ptr,
 152                                        hdata->dma_bounce_buffer,
 153                                        SCpnt->SCp.this_residual);
 154                         kfree(hdata->dma_bounce_buffer);
 155                         hdata->dma_bounce_buffer = NULL;
 156                         hdata->dma_bounce_len = 0;
 157                 } else {
 158                         kfree(hdata->dma_bounce_buffer);
 159                         hdata->dma_bounce_buffer = NULL;
 160                         hdata->dma_bounce_len = 0;
 161                 }
 162         }
 163 }
 164
 165 static int __init a3000_detect(struct scsi_host_template *tpnt)
 166 {
 167         struct Scsi_Host *instance;
 168         wd33c93_regs wdregs;
 169         struct a3000_scsiregs *regs;
 170         struct WD33C93_hostdata *hdata;
 171
 172         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
 173                 return 0;
 174         if (!request_mem_region(0xDD0000, 256, "wd33c93"))
 175                 return 0;
 176
 177         tpnt->proc_name = "A3000";
 178         tpnt->proc_info = &wd33c93_proc_info;
 179
 180         instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
 181         if (instance == NULL)
 182                 goto fail_register;
 183
 184         instance->base = ZTWO_VADDR(0xDD0000);
 185         instance->irq = IRQ_AMIGA_PORTS;
 186         regs = (struct a3000_scsiregs *)(instance->base);
 187         regs->DAWR = DAWR_A3000;
 188         wdregs.SASR = &regs->SASR;
 189         wdregs.SCMD = &regs->SCMD;
 190         hdata = shost_priv(instance);
 191         hdata->no_sync = 0xff;
 192         hdata->fast = 0;
 193         hdata->dma_mode = CTRL_DMA;
 194         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
 195         if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
 196                         instance))
 197                 goto fail_irq;
 198         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 199
 200         return 1;
 201
 202 fail_irq:
 203         scsi_unregister(instance);
 204 fail_register:
 205         release_mem_region(0xDD0000, 256);
 206         return 0;
 207 }
 208
 209 static int a3000_bus_reset(struct scsi_cmnd *cmd)
 210 {
 211         /* FIXME perform bus-specific reset */
 212
 213         /* FIXME 2: kill this entire function, which should
 214            cause mid-layer to call wd33c93_host_reset anyway? */
 215
 216         spin_lock_irq(cmd->device->host->host_lock);
 217         wd33c93_host_reset(cmd);
 218         spin_unlock_irq(cmd->device->host->host_lock);
 219
 220         return SUCCESS;
 221 }
 222
 223 #define HOSTS_C
 224
 225 static struct scsi_host_template driver_template = {
 226         .proc_name              = "A3000",
 227         .name                   = "Amiga 3000 built-in SCSI",
 228         .detect                 = a3000_detect,
 229         .release                = a3000_release,
 230         .queuecommand           = wd33c93_queuecommand,
 231         .eh_abort_handler       = wd33c93_abort,
 232         .eh_bus_reset_handler   = a3000_bus_reset,
 233         .eh_host_reset_handler  = wd33c93_host_reset,
 234         .can_queue              = CAN_QUEUE,
 235         .this_id                = 7,
 236         .sg_tablesize           = SG_ALL,
 237         .cmd_per_lun            = CMD_PER_LUN,
 238         .use_clustering         = ENABLE_CLUSTERING
 239 };
 240
 241
 242 #include "scsi_module.c"
 243
 244 static int a3000_release(struct Scsi_Host *instance)
 245 {
 246         struct a3000_scsiregs *regs = (struct a3000_scsiregs *)(instance->base);
 247
 248         regs->CNTR = 0;
 249         release_mem_region(0xDD0000, 256);
 250         free_irq(IRQ_AMIGA_PORTS, a3000_intr);
 251         return 1;
 252 }
 253
 254 MODULE_LICENSE("GPL");