drivers/scsi/a2091.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/types.h>
   3 #include <linux/init.h>
   4 #include <linux/interrupt.h>
   5 #include <linux/mm.h>
   6 #include <linux/slab.h>
   7 #include <linux/spinlock.h>
   8 #include <linux/zorro.h>
   9 #include <linux/module.h>
  10
  11 #include <asm/page.h>
  12 #include <asm/pgtable.h>
  13 #include <asm/amigaints.h>
  14 #include <asm/amigahw.h>
  15
  16 #include "scsi.h"
  17 #include "wd33c93.h"
  18 #include "a2091.h"
  19
  20
  21 struct a2091_hostdata {
  22         struct WD33C93_hostdata wh;
  23         struct a2091_scsiregs *regs;
  24 };
  25
  26 static irqreturn_t a2091_intr(int irq, void *data)
  27 {
  28         struct Scsi_Host *instance = data;
  29         struct a2091_hostdata *hdata = shost_priv(instance);
  30         unsigned int status = hdata->regs->ISTR;
  31         unsigned long flags;
  32
  33         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  34                 return IRQ_NONE;
  35
  36         spin_lock_irqsave(instance->host_lock, flags);
  37         wd33c93_intr(instance);
  38         spin_unlock_irqrestore(instance->host_lock, flags);
  39         return IRQ_HANDLED;
  40 }
  41
  42 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  43 {
  44         struct Scsi_Host *instance = cmd->device->host;
  45         struct a2091_hostdata *hdata = shost_priv(instance);
  46         struct WD33C93_hostdata *wh = &hdata->wh;
  47         struct a2091_scsiregs *regs = hdata->regs;
  48         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  49         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  50
  51         /* don't allow DMA if the physical address is bad */
  52         if (addr & A2091_XFER_MASK) {
  53                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  54                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
  55                                                 GFP_KERNEL);
  56
  57                 /* can't allocate memory; use PIO */
  58                 if (!wh->dma_bounce_buffer) {
  59                         wh->dma_bounce_len = 0;
  60                         return 1;
  61                 }
  62
  63                 /* get the physical address of the bounce buffer */
  64                 addr = virt_to_bus(wh->dma_bounce_buffer);
  65
  66                 /* the bounce buffer may not be in the first 16M of physmem */
  67                 if (addr & A2091_XFER_MASK) {
  68                         /* we could use chipmem... maybe later */
  69                         kfree(wh->dma_bounce_buffer);
  70                         wh->dma_bounce_buffer = NULL;
  71                         wh->dma_bounce_len = 0;
  72                         return 1;
  73                 }
  74
  75                 if (!dir_in) {
  76                         /* copy to bounce buffer for a write */
  77                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
  78                                cmd->SCp.this_residual);
  79                 }
  80         }
  81
  82         /* setup dma direction */
  83         if (!dir_in)
  84                 cntr |= CNTR_DDIR;
  85
  86         /* remember direction */
  87         wh->dma_dir = dir_in;
  88
  89         regs->CNTR = cntr;
  90
  91         /* setup DMA *physical* address */
  92         regs->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         regs->ST_DMA = 1;
 103
 104         /* return success */
 105         return 0;
 106 }
 107
 108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 109                      int status)
 110 {
 111         struct a2091_hostdata *hdata = shost_priv(instance);
 112         struct WD33C93_hostdata *wh = &hdata->wh;
 113         struct a2091_scsiregs *regs = hdata->regs;
 114
 115         /* disable SCSI interrupts */
 116         unsigned short cntr = CNTR_PDMD;
 117
 118         if (!wh->dma_dir)
 119                 cntr |= CNTR_DDIR;
 120
 121         /* disable SCSI interrupts */
 122         regs->CNTR = cntr;
 123
 124         /* flush if we were reading */
 125         if (wh->dma_dir) {
 126                 regs->FLUSH = 1;
 127                 while (!(regs->ISTR & ISTR_FE_FLG))
 128                         ;
 129         }
 130
 131         /* clear a possible interrupt */
 132         regs->CINT = 1;
 133
 134         /* stop DMA */
 135         regs->SP_DMA = 1;
 136
 137         /* restore the CONTROL bits (minus the direction flag) */
 138         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 139
 140         /* copy from a bounce buffer, if necessary */
 141         if (status && wh->dma_bounce_buffer) {
 142                 if (wh->dma_dir)
 143                         memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
 144                                SCpnt->SCp.this_residual);
 145                 kfree(wh->dma_bounce_buffer);
 146                 wh->dma_bounce_buffer = NULL;
 147                 wh->dma_bounce_len = 0;
 148         }
 149 }
 150
 151 static struct scsi_host_template a2091_scsi_template = {
 152         .module                 = THIS_MODULE,
 153         .name                   = "Commodore A2091/A590 SCSI",
 154         .show_info              = wd33c93_show_info,
 155         .write_info             = wd33c93_write_info,
 156         .proc_name              = "A2901",
 157         .queuecommand           = wd33c93_queuecommand,
 158         .eh_abort_handler       = wd33c93_abort,
 159         .eh_host_reset_handler  = wd33c93_host_reset,
 160         .can_queue              = CAN_QUEUE,
 161         .this_id                = 7,
 162         .sg_tablesize           = SG_ALL,
 163         .cmd_per_lun            = CMD_PER_LUN,
 164         .dma_boundary           = PAGE_SIZE - 1,
 165 };
 166
 167 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
 168 {
 169         struct Scsi_Host *instance;
 170         int error;
 171         struct a2091_scsiregs *regs;
 172         wd33c93_regs wdregs;
 173         struct a2091_hostdata *hdata;
 174
 175         if (!request_mem_region(z->resource.start, 256, "wd33c93"))
 176                 return -EBUSY;
 177
 178         instance = scsi_host_alloc(&a2091_scsi_template,
 179                                    sizeof(struct a2091_hostdata));
 180         if (!instance) {
 181                 error = -ENOMEM;
 182                 goto fail_alloc;
 183         }
 184
 185         instance->irq = IRQ_AMIGA_PORTS;
 186         instance->unique_id = z->slotaddr;
 187
 188         regs = ZTWO_VADDR(z->resource.start);
 189         regs->DAWR = DAWR_A2091;
 190
 191         wdregs.SASR = &regs->SASR;
 192         wdregs.SCMD = &regs->SCMD;
 193
 194         hdata = shost_priv(instance);
 195         hdata->wh.no_sync = 0xff;
 196         hdata->wh.fast = 0;
 197         hdata->wh.dma_mode = CTRL_DMA;
 198         hdata->regs = regs;
 199
 200         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
 201         error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 202                             "A2091 SCSI", instance);
 203         if (error)
 204                 goto fail_irq;
 205
 206         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 207
 208         error = scsi_add_host(instance, NULL);
 209         if (error)
 210                 goto fail_host;
 211
 212         zorro_set_drvdata(z, instance);
 213
 214         scsi_scan_host(instance);
 215         return 0;
 216
 217 fail_host:
 218         free_irq(IRQ_AMIGA_PORTS, instance);
 219 fail_irq:
 220         scsi_host_put(instance);
 221 fail_alloc:
 222         release_mem_region(z->resource.start, 256);
 223         return error;
 224 }
 225
 226 static void a2091_remove(struct zorro_dev *z)
 227 {
 228         struct Scsi_Host *instance = zorro_get_drvdata(z);
 229         struct a2091_hostdata *hdata = shost_priv(instance);
 230
 231         hdata->regs->CNTR = 0;
 232         scsi_remove_host(instance);
 233         free_irq(IRQ_AMIGA_PORTS, instance);
 234         scsi_host_put(instance);
 235         release_mem_region(z->resource.start, 256);
 236 }
 237
 238 static struct zorro_device_id a2091_zorro_tbl[] = {
 239         { ZORRO_PROD_CBM_A590_A2091_1 },
 240         { ZORRO_PROD_CBM_A590_A2091_2 },
 241         { 0 }
 242 };
 243 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
 244
 245 static struct zorro_driver a2091_driver = {
 246         .name           = "a2091",
 247         .id_table       = a2091_zorro_tbl,
 248         .probe          = a2091_probe,
 249         .remove         = a2091_remove,
 250 };
 251
 252 static int __init a2091_init(void)
 253 {
 254         return zorro_register_driver(&a2091_driver);
 255 }
 256 module_init(a2091_init);
 257
 258 static void __exit a2091_exit(void)
 259 {
 260         zorro_unregister_driver(&a2091_driver);
 261 }
 262 module_exit(a2091_exit);
 263
 264 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
 265 MODULE_LICENSE("GPL");