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/amigaints.h>
  13 #include <asm/amigahw.h>
  14
  15 #include <scsi/scsi.h>
  16 #include <scsi/scsi_cmnd.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_eh.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include "wd33c93.h"
  21 #include "a2091.h"
  22
  23
  24 struct a2091_hostdata {
  25         struct WD33C93_hostdata wh;
  26         struct a2091_scsiregs *regs;
  27 };
  28
  29 static irqreturn_t a2091_intr(int irq, void *data)
  30 {
  31         struct Scsi_Host *instance = data;
  32         struct a2091_hostdata *hdata = shost_priv(instance);
  33         unsigned int status = hdata->regs->ISTR;
  34         unsigned long flags;
  35
  36         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  37                 return IRQ_NONE;
  38
  39         spin_lock_irqsave(instance->host_lock, flags);
  40         wd33c93_intr(instance);
  41         spin_unlock_irqrestore(instance->host_lock, flags);
  42         return IRQ_HANDLED;
  43 }
  44
  45 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  46 {
  47         struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
  48         struct Scsi_Host *instance = cmd->device->host;
  49         struct a2091_hostdata *hdata = shost_priv(instance);
  50         struct WD33C93_hostdata *wh = &hdata->wh;
  51         struct a2091_scsiregs *regs = hdata->regs;
  52         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  53         unsigned long addr = virt_to_bus(scsi_pointer->ptr);
  54
  55         /* don't allow DMA if the physical address is bad */
  56         if (addr & A2091_XFER_MASK) {
  57                 wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
  58                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
  59                                                 GFP_KERNEL);
  60
  61                 /* can't allocate memory; use PIO */
  62                 if (!wh->dma_bounce_buffer) {
  63                         wh->dma_bounce_len = 0;
  64                         return 1;
  65                 }
  66
  67                 /* get the physical address of the bounce buffer */
  68                 addr = virt_to_bus(wh->dma_bounce_buffer);
  69
  70                 /* the bounce buffer may not be in the first 16M of physmem */
  71                 if (addr & A2091_XFER_MASK) {
  72                         /* we could use chipmem... maybe later */
  73                         kfree(wh->dma_bounce_buffer);
  74                         wh->dma_bounce_buffer = NULL;
  75                         wh->dma_bounce_len = 0;
  76                         return 1;
  77                 }
  78
  79                 if (!dir_in) {
  80                         /* copy to bounce buffer for a write */
  81                         memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
  82                                scsi_pointer->this_residual);
  83                 }
  84         }
  85
  86         /* setup dma direction */
  87         if (!dir_in)
  88                 cntr |= CNTR_DDIR;
  89
  90         /* remember direction */
  91         wh->dma_dir = dir_in;
  92
  93         regs->CNTR = cntr;
  94
  95         /* setup DMA *physical* address */
  96         regs->ACR = addr;
  97
  98         if (dir_in) {
  99                 /* invalidate any cache */
 100                 cache_clear(addr, scsi_pointer->this_residual);
 101         } else {
 102                 /* push any dirty cache */
 103                 cache_push(addr, scsi_pointer->this_residual);
 104         }
 105         /* start DMA */
 106         regs->ST_DMA = 1;
 107
 108         /* return success */
 109         return 0;
 110 }
 111
 112 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 113                      int status)
 114 {
 115         struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
 116         struct a2091_hostdata *hdata = shost_priv(instance);
 117         struct WD33C93_hostdata *wh = &hdata->wh;
 118         struct a2091_scsiregs *regs = hdata->regs;
 119
 120         /* disable SCSI interrupts */
 121         unsigned short cntr = CNTR_PDMD;
 122
 123         if (!wh->dma_dir)
 124                 cntr |= CNTR_DDIR;
 125
 126         /* disable SCSI interrupts */
 127         regs->CNTR = cntr;
 128
 129         /* flush if we were reading */
 130         if (wh->dma_dir) {
 131                 regs->FLUSH = 1;
 132                 while (!(regs->ISTR & ISTR_FE_FLG))
 133                         ;
 134         }
 135
 136         /* clear a possible interrupt */
 137         regs->CINT = 1;
 138
 139         /* stop DMA */
 140         regs->SP_DMA = 1;
 141
 142         /* restore the CONTROL bits (minus the direction flag) */
 143         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 144
 145         /* copy from a bounce buffer, if necessary */
 146         if (status && wh->dma_bounce_buffer) {
 147                 if (wh->dma_dir)
 148                         memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
 149                                scsi_pointer->this_residual);
 150                 kfree(wh->dma_bounce_buffer);
 151                 wh->dma_bounce_buffer = NULL;
 152                 wh->dma_bounce_len = 0;
 153         }
 154 }
 155
 156 static struct scsi_host_template a2091_scsi_template = {
 157         .module                 = THIS_MODULE,
 158         .name                   = "Commodore A2091/A590 SCSI",
 159         .show_info              = wd33c93_show_info,
 160         .write_info             = wd33c93_write_info,
 161         .proc_name              = "A2901",
 162         .queuecommand           = wd33c93_queuecommand,
 163         .eh_abort_handler       = wd33c93_abort,
 164         .eh_host_reset_handler  = wd33c93_host_reset,
 165         .can_queue              = CAN_QUEUE,
 166         .this_id                = 7,
 167         .sg_tablesize           = SG_ALL,
 168         .cmd_per_lun            = CMD_PER_LUN,
 169         .dma_boundary           = PAGE_SIZE - 1,
 170         .cmd_size               = sizeof(struct scsi_pointer),
 171 };
 172
 173 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
 174 {
 175         struct Scsi_Host *instance;
 176         int error;
 177         struct a2091_scsiregs *regs;
 178         wd33c93_regs wdregs;
 179         struct a2091_hostdata *hdata;
 180
 181         if (!request_mem_region(z->resource.start, 256, "wd33c93"))
 182                 return -EBUSY;
 183
 184         instance = scsi_host_alloc(&a2091_scsi_template,
 185                                    sizeof(struct a2091_hostdata));
 186         if (!instance) {
 187                 error = -ENOMEM;
 188                 goto fail_alloc;
 189         }
 190
 191         instance->irq = IRQ_AMIGA_PORTS;
 192         instance->unique_id = z->slotaddr;
 193
 194         regs = ZTWO_VADDR(z->resource.start);
 195         regs->DAWR = DAWR_A2091;
 196
 197         wdregs.SASR = &regs->SASR;
 198         wdregs.SCMD = &regs->SCMD;
 199
 200         hdata = shost_priv(instance);
 201         hdata->wh.no_sync = 0xff;
 202         hdata->wh.fast = 0;
 203         hdata->wh.dma_mode = CTRL_DMA;
 204         hdata->regs = regs;
 205
 206         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
 207         error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 208                             "A2091 SCSI", instance);
 209         if (error)
 210                 goto fail_irq;
 211
 212         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 213
 214         error = scsi_add_host(instance, NULL);
 215         if (error)
 216                 goto fail_host;
 217
 218         zorro_set_drvdata(z, instance);
 219
 220         scsi_scan_host(instance);
 221         return 0;
 222
 223 fail_host:
 224         free_irq(IRQ_AMIGA_PORTS, instance);
 225 fail_irq:
 226         scsi_host_put(instance);
 227 fail_alloc:
 228         release_mem_region(z->resource.start, 256);
 229         return error;
 230 }
 231
 232 static void a2091_remove(struct zorro_dev *z)
 233 {
 234         struct Scsi_Host *instance = zorro_get_drvdata(z);
 235         struct a2091_hostdata *hdata = shost_priv(instance);
 236
 237         hdata->regs->CNTR = 0;
 238         scsi_remove_host(instance);
 239         free_irq(IRQ_AMIGA_PORTS, instance);
 240         scsi_host_put(instance);
 241         release_mem_region(z->resource.start, 256);
 242 }
 243
 244 static struct zorro_device_id a2091_zorro_tbl[] = {
 245         { ZORRO_PROD_CBM_A590_A2091_1 },
 246         { ZORRO_PROD_CBM_A590_A2091_2 },
 247         { 0 }
 248 };
 249 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
 250
 251 static struct zorro_driver a2091_driver = {
 252         .name           = "a2091",
 253         .id_table       = a2091_zorro_tbl,
 254         .probe          = a2091_probe,
 255         .remove         = a2091_remove,
 256 };
 257
 258 static int __init a2091_init(void)
 259 {
 260         return zorro_register_driver(&a2091_driver);
 261 }
 262 module_init(a2091_init);
 263
 264 static void __exit a2091_exit(void)
 265 {
 266         zorro_unregister_driver(&a2091_driver);
 267 }
 268 module_exit(a2091_exit);
 269
 270 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
 271 MODULE_LICENSE("GPL");