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 (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) 51 { 52 HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511) 53 & ~0x1ff; 54 HDATA(instance)->dma_bounce_buffer = 55 kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL); 56 57 /* can't allocate memory; use PIO */ 58 if (!HDATA(instance)->dma_bounce_buffer) { 59 HDATA(instance)->dma_bounce_len = 0; 60 return 1; 61 } 62 63 /* get the physical address of the bounce buffer */ 64 addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer); 65 66 /* the bounce buffer may not be in the first 16M of physmem */ 67 if (addr & A2091_XFER_MASK) { 68 /* we could use chipmem... maybe later */ 69 kfree (HDATA(instance)->dma_bounce_buffer); 70 HDATA(instance)->dma_bounce_buffer = NULL; 71 HDATA(instance)->dma_bounce_len = 0; 72 return 1; 73 } 74 75 if (!dir_in) { 76 /* copy to bounce buffer for a write */ 77 memcpy (HDATA(instance)->dma_bounce_buffer, 78 cmd->SCp.ptr, cmd->SCp.this_residual); 79 } 80 } 81 82 /* setup dma direction */ 83 if (!dir_in) 84 cntr |= CNTR_DDIR; 85 86 /* remember direction */ 87 HDATA(cmd->device->host)->dma_dir = dir_in; 88 89 DMA(cmd->device->host)->CNTR = cntr; 90 91 /* setup DMA *physical* address */ 92 DMA(cmd->device->host)->ACR = addr; 93 94 if (dir_in){ 95 /* invalidate any cache */ 96 cache_clear (addr, cmd->SCp.this_residual); 97 }else{ 98 /* push any dirty cache */ 99 cache_push (addr, cmd->SCp.this_residual); 100 } 101 /* start DMA */ 102 DMA(cmd->device->host)->ST_DMA = 1; 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 /* disable SCSI interrupts */ 112 unsigned short cntr = CNTR_PDMD; 113 114 if (!HDATA(instance)->dma_dir) 115 cntr |= CNTR_DDIR; 116 117 /* disable SCSI interrupts */ 118 DMA(instance)->CNTR = cntr; 119 120 /* flush if we were reading */ 121 if (HDATA(instance)->dma_dir) { 122 DMA(instance)->FLUSH = 1; 123 while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) 124 ; 125 } 126 127 /* clear a possible interrupt */ 128 DMA(instance)->CINT = 1; 129 130 /* stop DMA */ 131 DMA(instance)->SP_DMA = 1; 132 133 /* restore the CONTROL bits (minus the direction flag) */ 134 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 135 136 /* copy from a bounce buffer, if necessary */ 137 if (status && HDATA(instance)->dma_bounce_buffer) { 138 if( HDATA(instance)->dma_dir ) 139 memcpy (SCpnt->SCp.ptr, 140 HDATA(instance)->dma_bounce_buffer, 141 SCpnt->SCp.this_residual); 142 kfree (HDATA(instance)->dma_bounce_buffer); 143 HDATA(instance)->dma_bounce_buffer = NULL; 144 HDATA(instance)->dma_bounce_len = 0; 145 } 146 } 147 148 int __init a2091_detect(struct scsi_host_template *tpnt) 149 { 150 static unsigned char called = 0; 151 struct Scsi_Host *instance; 152 unsigned long address; 153 struct zorro_dev *z = NULL; 154 wd33c93_regs regs; 155 int num_a2091 = 0; 156 157 if (!MACH_IS_AMIGA || called) 158 return 0; 159 called = 1; 160 161 tpnt->proc_name = "A2091"; 162 tpnt->proc_info = &wd33c93_proc_info; 163 164 while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { 165 if (z->id != ZORRO_PROD_CBM_A590_A2091_1 && 166 z->id != ZORRO_PROD_CBM_A590_A2091_2) 167 continue; 168 address = z->resource.start; 169 if (!request_mem_region(address, 256, "wd33c93")) 170 continue; 171 172 instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata)); 173 if (instance == NULL) { 174 release_mem_region(address, 256); 175 continue; 176 } 177 instance->base = ZTWO_VADDR(address); 178 instance->irq = IRQ_AMIGA_PORTS; 179 instance->unique_id = z->slotaddr; 180 DMA(instance)->DAWR = DAWR_A2091; 181 regs.SASR = &(DMA(instance)->SASR); 182 regs.SCMD = &(DMA(instance)->SCMD); 183 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 184 request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI", 185 instance); 186 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 187 num_a2091++; 188 } 189 190 return num_a2091; 191 } 192 193 static int a2091_bus_reset(struct scsi_cmnd *cmd) 194 { 195 /* FIXME perform bus-specific reset */ 196 197 /* FIXME 2: kill this function, and let midlayer fall back 198 to the same action, calling wd33c93_host_reset() */ 199 200 spin_lock_irq(cmd->device->host->host_lock); 201 wd33c93_host_reset(cmd); 202 spin_unlock_irq(cmd->device->host->host_lock); 203 204 return SUCCESS; 205 } 206 207 #define HOSTS_C 208 209 static struct scsi_host_template driver_template = { 210 .proc_name = "A2901", 211 .name = "Commodore A2091/A590 SCSI", 212 .detect = a2091_detect, 213 .release = a2091_release, 214 .queuecommand = wd33c93_queuecommand, 215 .eh_abort_handler = wd33c93_abort, 216 .eh_bus_reset_handler = a2091_bus_reset, 217 .eh_host_reset_handler = wd33c93_host_reset, 218 .can_queue = CAN_QUEUE, 219 .this_id = 7, 220 .sg_tablesize = SG_ALL, 221 .cmd_per_lun = CMD_PER_LUN, 222 .use_clustering = DISABLE_CLUSTERING 223 }; 224 225 226 #include "scsi_module.c" 227 228 int a2091_release(struct Scsi_Host *instance) 229 { 230 #ifdef MODULE 231 DMA(instance)->CNTR = 0; 232 release_mem_region(ZTWO_PADDR(instance->base), 256); 233 free_irq(IRQ_AMIGA_PORTS, instance); 234 wd33c93_release(); 235 #endif 236 return 1; 237 } 238 239 MODULE_LICENSE("GPL"); 240