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