| 1 | #include <linux/types.h> |
| 2 | #include <linux/mm.h> |
| 3 | #include <linux/ioport.h> |
| 4 | #include <linux/init.h> |
| 5 | #include <linux/slab.h> |
| 6 | #include <linux/spinlock.h> |
| 7 | #include <linux/interrupt.h> |
| 8 | #include <linux/platform_device.h> |
| 9 | |
| 10 | #include <asm/page.h> |
| 11 | #include <asm/pgtable.h> |
| 12 | #include <asm/amigaints.h> |
| 13 | #include <asm/amigahw.h> |
| 14 | |
| 15 | #include "scsi.h" |
| 16 | #include "wd33c93.h" |
| 17 | #include "a3000.h" |
| 18 | |
| 19 | |
| 20 | struct a3000_hostdata { |
| 21 | struct WD33C93_hostdata wh; |
| 22 | struct a3000_scsiregs *regs; |
| 23 | }; |
| 24 | |
| 25 | static irqreturn_t a3000_intr(int irq, void *data) |
| 26 | { |
| 27 | struct Scsi_Host *instance = data; |
| 28 | struct a3000_hostdata *hdata = shost_priv(instance); |
| 29 | unsigned int status = hdata->regs->ISTR; |
| 30 | unsigned long flags; |
| 31 | |
| 32 | if (!(status & ISTR_INT_P)) |
| 33 | return IRQ_NONE; |
| 34 | if (status & ISTR_INTS) { |
| 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 | pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); |
| 41 | return IRQ_NONE; |
| 42 | } |
| 43 | |
| 44 | static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
| 45 | { |
| 46 | struct Scsi_Host *instance = cmd->device->host; |
| 47 | struct a3000_hostdata *hdata = shost_priv(instance); |
| 48 | struct WD33C93_hostdata *wh = &hdata->wh; |
| 49 | struct a3000_scsiregs *regs = hdata->regs; |
| 50 | unsigned short cntr = CNTR_PDMD | CNTR_INTEN; |
| 51 | unsigned long addr = virt_to_bus(cmd->SCp.ptr); |
| 52 | |
| 53 | /* |
| 54 | * if the physical address has the wrong alignment, or if |
| 55 | * physical address is bad, or if it is a write and at the |
| 56 | * end of a physical memory chunk, then allocate a bounce |
| 57 | * buffer |
| 58 | */ |
| 59 | if (addr & A3000_XFER_MASK) { |
| 60 | wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; |
| 61 | wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len, |
| 62 | GFP_KERNEL); |
| 63 | |
| 64 | /* can't allocate memory; use PIO */ |
| 65 | if (!wh->dma_bounce_buffer) { |
| 66 | wh->dma_bounce_len = 0; |
| 67 | return 1; |
| 68 | } |
| 69 | |
| 70 | if (!dir_in) { |
| 71 | /* copy to bounce buffer for a write */ |
| 72 | memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, |
| 73 | cmd->SCp.this_residual); |
| 74 | } |
| 75 | |
| 76 | addr = virt_to_bus(wh->dma_bounce_buffer); |
| 77 | } |
| 78 | |
| 79 | /* setup dma direction */ |
| 80 | if (!dir_in) |
| 81 | cntr |= CNTR_DDIR; |
| 82 | |
| 83 | /* remember direction */ |
| 84 | wh->dma_dir = dir_in; |
| 85 | |
| 86 | regs->CNTR = cntr; |
| 87 | |
| 88 | /* setup DMA *physical* address */ |
| 89 | regs->ACR = addr; |
| 90 | |
| 91 | if (dir_in) { |
| 92 | /* invalidate any cache */ |
| 93 | cache_clear(addr, cmd->SCp.this_residual); |
| 94 | } else { |
| 95 | /* push any dirty cache */ |
| 96 | cache_push(addr, cmd->SCp.this_residual); |
| 97 | } |
| 98 | |
| 99 | /* start DMA */ |
| 100 | mb(); /* make sure setup is completed */ |
| 101 | regs->ST_DMA = 1; |
| 102 | mb(); /* make sure DMA has started before next IO */ |
| 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 a3000_hostdata *hdata = shost_priv(instance); |
| 112 | struct WD33C93_hostdata *wh = &hdata->wh; |
| 113 | struct a3000_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 | regs->CNTR = cntr; |
| 122 | mb(); /* make sure CNTR is updated before next IO */ |
| 123 | |
| 124 | /* flush if we were reading */ |
| 125 | if (wh->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 && wh->dma_bounce_buffer) { |
| 149 | if (SCpnt) { |
| 150 | if (wh->dma_dir && SCpnt) |
| 151 | memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, |
| 152 | SCpnt->SCp.this_residual); |
| 153 | kfree(wh->dma_bounce_buffer); |
| 154 | wh->dma_bounce_buffer = NULL; |
| 155 | wh->dma_bounce_len = 0; |
| 156 | } else { |
| 157 | kfree(wh->dma_bounce_buffer); |
| 158 | wh->dma_bounce_buffer = NULL; |
| 159 | wh->dma_bounce_len = 0; |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | static int a3000_bus_reset(struct scsi_cmnd *cmd) |
| 165 | { |
| 166 | struct Scsi_Host *instance = cmd->device->host; |
| 167 | |
| 168 | /* FIXME perform bus-specific reset */ |
| 169 | |
| 170 | /* FIXME 2: kill this entire function, which should |
| 171 | cause mid-layer to call wd33c93_host_reset anyway? */ |
| 172 | |
| 173 | spin_lock_irq(instance->host_lock); |
| 174 | wd33c93_host_reset(cmd); |
| 175 | spin_unlock_irq(instance->host_lock); |
| 176 | |
| 177 | return SUCCESS; |
| 178 | } |
| 179 | |
| 180 | static struct scsi_host_template amiga_a3000_scsi_template = { |
| 181 | .module = THIS_MODULE, |
| 182 | .name = "Amiga 3000 built-in SCSI", |
| 183 | .proc_info = wd33c93_proc_info, |
| 184 | .proc_name = "A3000", |
| 185 | .queuecommand = wd33c93_queuecommand, |
| 186 | .eh_abort_handler = wd33c93_abort, |
| 187 | .eh_bus_reset_handler = a3000_bus_reset, |
| 188 | .eh_host_reset_handler = wd33c93_host_reset, |
| 189 | .can_queue = CAN_QUEUE, |
| 190 | .this_id = 7, |
| 191 | .sg_tablesize = SG_ALL, |
| 192 | .cmd_per_lun = CMD_PER_LUN, |
| 193 | .use_clustering = ENABLE_CLUSTERING |
| 194 | }; |
| 195 | |
| 196 | static int __init amiga_a3000_scsi_probe(struct platform_device *pdev) |
| 197 | { |
| 198 | struct resource *res; |
| 199 | struct Scsi_Host *instance; |
| 200 | int error; |
| 201 | struct a3000_scsiregs *regs; |
| 202 | wd33c93_regs wdregs; |
| 203 | struct a3000_hostdata *hdata; |
| 204 | |
| 205 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 206 | if (!res) |
| 207 | return -ENODEV; |
| 208 | |
| 209 | if (!request_mem_region(res->start, resource_size(res), "wd33c93")) |
| 210 | return -EBUSY; |
| 211 | |
| 212 | instance = scsi_host_alloc(&amiga_a3000_scsi_template, |
| 213 | sizeof(struct a3000_hostdata)); |
| 214 | if (!instance) { |
| 215 | error = -ENOMEM; |
| 216 | goto fail_alloc; |
| 217 | } |
| 218 | |
| 219 | instance->irq = IRQ_AMIGA_PORTS; |
| 220 | |
| 221 | regs = (struct a3000_scsiregs *)ZTWO_VADDR(res->start); |
| 222 | regs->DAWR = DAWR_A3000; |
| 223 | |
| 224 | wdregs.SASR = ®s->SASR; |
| 225 | wdregs.SCMD = ®s->SCMD; |
| 226 | |
| 227 | hdata = shost_priv(instance); |
| 228 | hdata->wh.no_sync = 0xff; |
| 229 | hdata->wh.fast = 0; |
| 230 | hdata->wh.dma_mode = CTRL_DMA; |
| 231 | hdata->regs = regs; |
| 232 | |
| 233 | wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15); |
| 234 | error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, |
| 235 | "A3000 SCSI", instance); |
| 236 | if (error) |
| 237 | goto fail_irq; |
| 238 | |
| 239 | regs->CNTR = CNTR_PDMD | CNTR_INTEN; |
| 240 | |
| 241 | error = scsi_add_host(instance, NULL); |
| 242 | if (error) |
| 243 | goto fail_host; |
| 244 | |
| 245 | platform_set_drvdata(pdev, instance); |
| 246 | |
| 247 | scsi_scan_host(instance); |
| 248 | return 0; |
| 249 | |
| 250 | fail_host: |
| 251 | free_irq(IRQ_AMIGA_PORTS, instance); |
| 252 | fail_irq: |
| 253 | scsi_host_put(instance); |
| 254 | fail_alloc: |
| 255 | release_mem_region(res->start, resource_size(res)); |
| 256 | return error; |
| 257 | } |
| 258 | |
| 259 | static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev) |
| 260 | { |
| 261 | struct Scsi_Host *instance = platform_get_drvdata(pdev); |
| 262 | struct a3000_hostdata *hdata = shost_priv(instance); |
| 263 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 264 | |
| 265 | hdata->regs->CNTR = 0; |
| 266 | scsi_remove_host(instance); |
| 267 | free_irq(IRQ_AMIGA_PORTS, instance); |
| 268 | scsi_host_put(instance); |
| 269 | release_mem_region(res->start, resource_size(res)); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static struct platform_driver amiga_a3000_scsi_driver = { |
| 274 | .remove = __exit_p(amiga_a3000_scsi_remove), |
| 275 | .driver = { |
| 276 | .name = "amiga-a3000-scsi", |
| 277 | .owner = THIS_MODULE, |
| 278 | }, |
| 279 | }; |
| 280 | |
| 281 | static int __init amiga_a3000_scsi_init(void) |
| 282 | { |
| 283 | return platform_driver_probe(&amiga_a3000_scsi_driver, |
| 284 | amiga_a3000_scsi_probe); |
| 285 | } |
| 286 | module_init(amiga_a3000_scsi_init); |
| 287 | |
| 288 | static void __exit amiga_a3000_scsi_exit(void) |
| 289 | { |
| 290 | platform_driver_unregister(&amiga_a3000_scsi_driver); |
| 291 | } |
| 292 | module_exit(amiga_a3000_scsi_exit); |
| 293 | |
| 294 | MODULE_DESCRIPTION("Amiga 3000 built-in SCSI"); |
| 295 | MODULE_LICENSE("GPL"); |
| 296 | MODULE_ALIAS("platform:amiga-a3000-scsi"); |