1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/mm.h> 4 #include <linux/ioport.h> 5 #include <linux/init.h> 6 #include <linux/slab.h> 7 #include <linux/spinlock.h> 8 #include <linux/interrupt.h> 9 #include <linux/platform_device.h> 10 #include <linux/module.h> 11 12 #include <asm/page.h> 13 #include <asm/amigaints.h> 14 #include <asm/amigahw.h> 15 16 #include "scsi.h" 17 #include "wd33c93.h" 18 #include "a3000.h" 19 20 21 struct a3000_hostdata { 22 struct WD33C93_hostdata wh; 23 struct a3000_scsiregs *regs; 24 }; 25 26 static irqreturn_t a3000_intr(int irq, void *data) 27 { 28 struct Scsi_Host *instance = data; 29 struct a3000_hostdata *hdata = shost_priv(instance); 30 unsigned int status = hdata->regs->ISTR; 31 unsigned long flags; 32 33 if (!(status & ISTR_INT_P)) 34 return IRQ_NONE; 35 if (status & ISTR_INTS) { 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 pr_warn("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); 42 return IRQ_NONE; 43 } 44 45 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 46 { 47 struct Scsi_Host *instance = cmd->device->host; 48 struct a3000_hostdata *hdata = shost_priv(instance); 49 struct WD33C93_hostdata *wh = &hdata->wh; 50 struct a3000_scsiregs *regs = hdata->regs; 51 unsigned short cntr = CNTR_PDMD | CNTR_INTEN; 52 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 53 54 /* 55 * if the physical address has the wrong alignment, or if 56 * physical address is bad, or if it is a write and at the 57 * end of a physical memory chunk, then allocate a bounce 58 * buffer 59 */ 60 if (addr & A3000_XFER_MASK) { 61 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; 62 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len, 63 GFP_KERNEL); 64 65 /* can't allocate memory; use PIO */ 66 if (!wh->dma_bounce_buffer) { 67 wh->dma_bounce_len = 0; 68 return 1; 69 } 70 71 if (!dir_in) { 72 /* copy to bounce buffer for a write */ 73 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, 74 cmd->SCp.this_residual); 75 } 76 77 addr = virt_to_bus(wh->dma_bounce_buffer); 78 } 79 80 /* setup dma direction */ 81 if (!dir_in) 82 cntr |= CNTR_DDIR; 83 84 /* remember direction */ 85 wh->dma_dir = dir_in; 86 87 regs->CNTR = cntr; 88 89 /* setup DMA *physical* address */ 90 regs->ACR = addr; 91 92 if (dir_in) { 93 /* invalidate any cache */ 94 cache_clear(addr, cmd->SCp.this_residual); 95 } else { 96 /* push any dirty cache */ 97 cache_push(addr, cmd->SCp.this_residual); 98 } 99 100 /* start DMA */ 101 mb(); /* make sure setup is completed */ 102 regs->ST_DMA = 1; 103 mb(); /* make sure DMA has started before next IO */ 104 105 /* return success */ 106 return 0; 107 } 108 109 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 110 int status) 111 { 112 struct a3000_hostdata *hdata = shost_priv(instance); 113 struct WD33C93_hostdata *wh = &hdata->wh; 114 struct a3000_scsiregs *regs = hdata->regs; 115 116 /* disable SCSI interrupts */ 117 unsigned short cntr = CNTR_PDMD; 118 119 if (!wh->dma_dir) 120 cntr |= CNTR_DDIR; 121 122 regs->CNTR = cntr; 123 mb(); /* make sure CNTR is updated before next IO */ 124 125 /* flush if we were reading */ 126 if (wh->dma_dir) { 127 regs->FLUSH = 1; 128 mb(); /* don't allow prefetch */ 129 while (!(regs->ISTR & ISTR_FE_FLG)) 130 barrier(); 131 mb(); /* no IO until FLUSH is done */ 132 } 133 134 /* clear a possible interrupt */ 135 /* I think that this CINT is only necessary if you are 136 * using the terminal count features. HM 7 Mar 1994 137 */ 138 regs->CINT = 1; 139 140 /* stop DMA */ 141 regs->SP_DMA = 1; 142 mb(); /* make sure DMA is stopped before next IO */ 143 144 /* restore the CONTROL bits (minus the direction flag) */ 145 regs->CNTR = CNTR_PDMD | CNTR_INTEN; 146 mb(); /* make sure CNTR is updated before next IO */ 147 148 /* copy from a bounce buffer, if necessary */ 149 if (status && wh->dma_bounce_buffer) { 150 if (SCpnt) { 151 if (wh->dma_dir && SCpnt) 152 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, 153 SCpnt->SCp.this_residual); 154 kfree(wh->dma_bounce_buffer); 155 wh->dma_bounce_buffer = NULL; 156 wh->dma_bounce_len = 0; 157 } else { 158 kfree(wh->dma_bounce_buffer); 159 wh->dma_bounce_buffer = NULL; 160 wh->dma_bounce_len = 0; 161 } 162 } 163 } 164 165 static struct scsi_host_template amiga_a3000_scsi_template = { 166 .module = THIS_MODULE, 167 .name = "Amiga 3000 built-in SCSI", 168 .show_info = wd33c93_show_info, 169 .write_info = wd33c93_write_info, 170 .proc_name = "A3000", 171 .queuecommand = wd33c93_queuecommand, 172 .eh_abort_handler = wd33c93_abort, 173 .eh_host_reset_handler = wd33c93_host_reset, 174 .can_queue = CAN_QUEUE, 175 .this_id = 7, 176 .sg_tablesize = SG_ALL, 177 .cmd_per_lun = CMD_PER_LUN, 178 }; 179 180 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev) 181 { 182 struct resource *res; 183 struct Scsi_Host *instance; 184 int error; 185 struct a3000_scsiregs *regs; 186 wd33c93_regs wdregs; 187 struct a3000_hostdata *hdata; 188 189 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 190 if (!res) 191 return -ENODEV; 192 193 if (!request_mem_region(res->start, resource_size(res), "wd33c93")) 194 return -EBUSY; 195 196 instance = scsi_host_alloc(&amiga_a3000_scsi_template, 197 sizeof(struct a3000_hostdata)); 198 if (!instance) { 199 error = -ENOMEM; 200 goto fail_alloc; 201 } 202 203 instance->irq = IRQ_AMIGA_PORTS; 204 205 regs = ZTWO_VADDR(res->start); 206 regs->DAWR = DAWR_A3000; 207 208 wdregs.SASR = ®s->SASR; 209 wdregs.SCMD = ®s->SCMD; 210 211 hdata = shost_priv(instance); 212 hdata->wh.no_sync = 0xff; 213 hdata->wh.fast = 0; 214 hdata->wh.dma_mode = CTRL_DMA; 215 hdata->regs = regs; 216 217 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15); 218 error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, 219 "A3000 SCSI", instance); 220 if (error) 221 goto fail_irq; 222 223 regs->CNTR = CNTR_PDMD | CNTR_INTEN; 224 225 error = scsi_add_host(instance, NULL); 226 if (error) 227 goto fail_host; 228 229 platform_set_drvdata(pdev, instance); 230 231 scsi_scan_host(instance); 232 return 0; 233 234 fail_host: 235 free_irq(IRQ_AMIGA_PORTS, instance); 236 fail_irq: 237 scsi_host_put(instance); 238 fail_alloc: 239 release_mem_region(res->start, resource_size(res)); 240 return error; 241 } 242 243 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev) 244 { 245 struct Scsi_Host *instance = platform_get_drvdata(pdev); 246 struct a3000_hostdata *hdata = shost_priv(instance); 247 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 248 249 hdata->regs->CNTR = 0; 250 scsi_remove_host(instance); 251 free_irq(IRQ_AMIGA_PORTS, instance); 252 scsi_host_put(instance); 253 release_mem_region(res->start, resource_size(res)); 254 return 0; 255 } 256 257 static struct platform_driver amiga_a3000_scsi_driver = { 258 .remove = __exit_p(amiga_a3000_scsi_remove), 259 .driver = { 260 .name = "amiga-a3000-scsi", 261 }, 262 }; 263 264 module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe); 265 266 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI"); 267 MODULE_LICENSE("GPL"); 268 MODULE_ALIAS("platform:amiga-a3000-scsi"); 269