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