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