1 #include <linux/types.h> 2 #include <linux/mm.h> 3 #include <linux/blkdev.h> 4 #include <linux/sched.h> 5 #include <linux/version.h> 6 #include <linux/init.h> 7 #include <linux/interrupt.h> 8 9 #include <asm/setup.h> 10 #include <asm/page.h> 11 #include <asm/pgtable.h> 12 #include <asm/amigaints.h> 13 #include <asm/amigahw.h> 14 #include <linux/zorro.h> 15 #include <asm/irq.h> 16 #include <linux/spinlock.h> 17 18 #include "scsi.h" 19 #include <scsi/scsi_host.h> 20 #include "wd33c93.h" 21 #include "a2091.h" 22 23 #include<linux/stat.h> 24 25 #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base)) 26 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) 27 28 static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp) 29 { 30 unsigned long flags; 31 unsigned int status; 32 struct Scsi_Host *instance = (struct Scsi_Host *)_instance; 33 34 status = DMA(instance)->ISTR; 35 if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS)) 36 return IRQ_NONE; 37 38 spin_lock_irqsave(instance->host_lock, flags); 39 wd33c93_intr(instance); 40 spin_unlock_irqrestore(instance->host_lock, flags); 41 return IRQ_HANDLED; 42 } 43 44 static int dma_setup (Scsi_Cmnd *cmd, int dir_in) 45 { 46 unsigned short cntr = CNTR_PDMD | CNTR_INTEN; 47 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 48 struct Scsi_Host *instance = cmd->device->host; 49 50 /* don't allow DMA if the physical address is bad */ 51 if (addr & A2091_XFER_MASK || 52 (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) 53 { 54 HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511) 55 & ~0x1ff; 56 HDATA(instance)->dma_bounce_buffer = 57 kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL); 58 59 /* can't allocate memory; use PIO */ 60 if (!HDATA(instance)->dma_bounce_buffer) { 61 HDATA(instance)->dma_bounce_len = 0; 62 return 1; 63 } 64 65 /* get the physical address of the bounce buffer */ 66 addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer); 67 68 /* the bounce buffer may not be in the first 16M of physmem */ 69 if (addr & A2091_XFER_MASK) { 70 /* we could use chipmem... maybe later */ 71 kfree (HDATA(instance)->dma_bounce_buffer); 72 HDATA(instance)->dma_bounce_buffer = NULL; 73 HDATA(instance)->dma_bounce_len = 0; 74 return 1; 75 } 76 77 if (!dir_in) { 78 /* copy to bounce buffer for a write */ 79 if (cmd->use_sg) 80 #if 0 81 panic ("scsi%ddma: incomplete s/g support", 82 instance->host_no); 83 #else 84 memcpy (HDATA(instance)->dma_bounce_buffer, 85 cmd->SCp.ptr, cmd->SCp.this_residual); 86 #endif 87 else 88 memcpy (HDATA(instance)->dma_bounce_buffer, 89 cmd->request_buffer, cmd->request_bufflen); 90 } 91 } 92 93 /* setup dma direction */ 94 if (!dir_in) 95 cntr |= CNTR_DDIR; 96 97 /* remember direction */ 98 HDATA(cmd->device->host)->dma_dir = dir_in; 99 100 DMA(cmd->device->host)->CNTR = cntr; 101 102 /* setup DMA *physical* address */ 103 DMA(cmd->device->host)->ACR = addr; 104 105 if (dir_in){ 106 /* invalidate any cache */ 107 cache_clear (addr, cmd->SCp.this_residual); 108 }else{ 109 /* push any dirty cache */ 110 cache_push (addr, cmd->SCp.this_residual); 111 } 112 /* start DMA */ 113 DMA(cmd->device->host)->ST_DMA = 1; 114 115 /* return success */ 116 return 0; 117 } 118 119 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, 120 int status) 121 { 122 /* disable SCSI interrupts */ 123 unsigned short cntr = CNTR_PDMD; 124 125 if (!HDATA(instance)->dma_dir) 126 cntr |= CNTR_DDIR; 127 128 /* disable SCSI interrupts */ 129 DMA(instance)->CNTR = cntr; 130 131 /* flush if we were reading */ 132 if (HDATA(instance)->dma_dir) { 133 DMA(instance)->FLUSH = 1; 134 while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) 135 ; 136 } 137 138 /* clear a possible interrupt */ 139 DMA(instance)->CINT = 1; 140 141 /* stop DMA */ 142 DMA(instance)->SP_DMA = 1; 143 144 /* restore the CONTROL bits (minus the direction flag) */ 145 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 146 147 /* copy from a bounce buffer, if necessary */ 148 if (status && HDATA(instance)->dma_bounce_buffer) { 149 if (SCpnt && SCpnt->use_sg) { 150 #if 0 151 panic ("scsi%d: incomplete s/g support", 152 instance->host_no); 153 #else 154 if( HDATA(instance)->dma_dir ) 155 memcpy (SCpnt->SCp.ptr, 156 HDATA(instance)->dma_bounce_buffer, 157 SCpnt->SCp.this_residual); 158 kfree (HDATA(instance)->dma_bounce_buffer); 159 HDATA(instance)->dma_bounce_buffer = NULL; 160 HDATA(instance)->dma_bounce_len = 0; 161 162 #endif 163 } else { 164 if (HDATA(instance)->dma_dir && SCpnt) 165 memcpy (SCpnt->request_buffer, 166 HDATA(instance)->dma_bounce_buffer, 167 SCpnt->request_bufflen); 168 169 kfree (HDATA(instance)->dma_bounce_buffer); 170 HDATA(instance)->dma_bounce_buffer = NULL; 171 HDATA(instance)->dma_bounce_len = 0; 172 } 173 } 174 } 175 176 int __init a2091_detect(Scsi_Host_Template *tpnt) 177 { 178 static unsigned char called = 0; 179 struct Scsi_Host *instance; 180 unsigned long address; 181 struct zorro_dev *z = NULL; 182 wd33c93_regs regs; 183 int num_a2091 = 0; 184 185 if (!MACH_IS_AMIGA || called) 186 return 0; 187 called = 1; 188 189 tpnt->proc_name = "A2091"; 190 tpnt->proc_info = &wd33c93_proc_info; 191 192 while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { 193 if (z->id != ZORRO_PROD_CBM_A590_A2091_1 && 194 z->id != ZORRO_PROD_CBM_A590_A2091_2) 195 continue; 196 address = z->resource.start; 197 if (!request_mem_region(address, 256, "wd33c93")) 198 continue; 199 200 instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata)); 201 if (instance == NULL) { 202 release_mem_region(address, 256); 203 continue; 204 } 205 instance->base = ZTWO_VADDR(address); 206 instance->irq = IRQ_AMIGA_PORTS; 207 instance->unique_id = z->slotaddr; 208 DMA(instance)->DAWR = DAWR_A2091; 209 regs.SASR = &(DMA(instance)->SASR); 210 regs.SCMD = &(DMA(instance)->SCMD); 211 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 212 request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI", 213 instance); 214 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 215 num_a2091++; 216 } 217 218 return num_a2091; 219 } 220 221 static int a2091_bus_reset(Scsi_Cmnd *cmd) 222 { 223 /* FIXME perform bus-specific reset */ 224 225 /* FIXME 2: kill this function, and let midlayer fall back 226 to the same action, calling wd33c93_host_reset() */ 227 228 spin_lock_irq(cmd->device->host->host_lock); 229 wd33c93_host_reset(cmd); 230 spin_unlock_irq(cmd->device->host->host_lock); 231 232 return SUCCESS; 233 } 234 235 #define HOSTS_C 236 237 static Scsi_Host_Template driver_template = { 238 .proc_name = "A2901", 239 .name = "Commodore A2091/A590 SCSI", 240 .detect = a2091_detect, 241 .release = a2091_release, 242 .queuecommand = wd33c93_queuecommand, 243 .eh_abort_handler = wd33c93_abort, 244 .eh_bus_reset_handler = a2091_bus_reset, 245 .eh_host_reset_handler = wd33c93_host_reset, 246 .can_queue = CAN_QUEUE, 247 .this_id = 7, 248 .sg_tablesize = SG_ALL, 249 .cmd_per_lun = CMD_PER_LUN, 250 .use_clustering = DISABLE_CLUSTERING 251 }; 252 253 254 #include "scsi_module.c" 255 256 int a2091_release(struct Scsi_Host *instance) 257 { 258 #ifdef MODULE 259 DMA(instance)->CNTR = 0; 260 release_mem_region(ZTWO_PADDR(instance->base), 256); 261 free_irq(IRQ_AMIGA_PORTS, instance); 262 wd33c93_release(); 263 #endif 264 return 1; 265 } 266 267 MODULE_LICENSE("GPL"); 268