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 = ®s->SASR; 192 wdregs.SCMD = ®s->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"); 266