1 #include <linux/types.h> 2 #include <linux/mm.h> 3 #include <linux/blkdev.h> 4 #include <linux/ioport.h> 5 #include <linux/init.h> 6 #include <linux/spinlock.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 <asm/irq.h> 15 16 #include "scsi.h" 17 #include <scsi/scsi_host.h> 18 #include "wd33c93.h" 19 #include "a3000.h" 20 21 #include<linux/stat.h> 22 23 #define DMA(ptr) ((a3000_scsiregs *)((ptr)->base)) 24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) 25 26 static struct Scsi_Host *a3000_host = NULL; 27 28 static irqreturn_t a3000_intr (int irq, void *dummy) 29 { 30 unsigned long flags; 31 unsigned int status = DMA(a3000_host)->ISTR; 32 33 if (!(status & ISTR_INT_P)) 34 return IRQ_NONE; 35 if (status & ISTR_INTS) 36 { 37 spin_lock_irqsave(a3000_host->host_lock, flags); 38 wd33c93_intr (a3000_host); 39 spin_unlock_irqrestore(a3000_host->host_lock, flags); 40 return IRQ_HANDLED; 41 } 42 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); 43 return IRQ_NONE; 44 } 45 46 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 47 { 48 unsigned short cntr = CNTR_PDMD | CNTR_INTEN; 49 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 50 51 /* 52 * if the physical address has the wrong alignment, or if 53 * physical address is bad, or if it is a write and at the 54 * end of a physical memory chunk, then allocate a bounce 55 * buffer 56 */ 57 if (addr & A3000_XFER_MASK) 58 { 59 HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511) 60 & ~0x1ff; 61 HDATA(a3000_host)->dma_bounce_buffer = 62 kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL); 63 64 /* can't allocate memory; use PIO */ 65 if (!HDATA(a3000_host)->dma_bounce_buffer) { 66 HDATA(a3000_host)->dma_bounce_len = 0; 67 return 1; 68 } 69 70 if (!dir_in) { 71 /* copy to bounce buffer for a write */ 72 memcpy (HDATA(a3000_host)->dma_bounce_buffer, 73 cmd->SCp.ptr, cmd->SCp.this_residual); 74 } 75 76 addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer); 77 } 78 79 /* setup dma direction */ 80 if (!dir_in) 81 cntr |= CNTR_DDIR; 82 83 /* remember direction */ 84 HDATA(a3000_host)->dma_dir = dir_in; 85 86 DMA(a3000_host)->CNTR = cntr; 87 88 /* setup DMA *physical* address */ 89 DMA(a3000_host)->ACR = addr; 90 91 if (dir_in) 92 /* invalidate any cache */ 93 cache_clear (addr, cmd->SCp.this_residual); 94 else 95 /* push any dirty cache */ 96 cache_push (addr, cmd->SCp.this_residual); 97 98 /* start DMA */ 99 mb(); /* make sure setup is completed */ 100 DMA(a3000_host)->ST_DMA = 1; 101 mb(); /* make sure DMA has started before next IO */ 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 DMA(instance)->CNTR = cntr; 117 mb(); /* make sure CNTR is updated before next IO */ 118 119 /* flush if we were reading */ 120 if (HDATA(instance)->dma_dir) { 121 DMA(instance)->FLUSH = 1; 122 mb(); /* don't allow prefetch */ 123 while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) 124 barrier(); 125 mb(); /* no IO until FLUSH is done */ 126 } 127 128 /* clear a possible interrupt */ 129 /* I think that this CINT is only necessary if you are 130 * using the terminal count features. HM 7 Mar 1994 131 */ 132 DMA(instance)->CINT = 1; 133 134 /* stop DMA */ 135 DMA(instance)->SP_DMA = 1; 136 mb(); /* make sure DMA is stopped before next IO */ 137 138 /* restore the CONTROL bits (minus the direction flag) */ 139 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 140 mb(); /* make sure CNTR is updated before next IO */ 141 142 /* copy from a bounce buffer, if necessary */ 143 if (status && HDATA(instance)->dma_bounce_buffer) { 144 if (SCpnt) { 145 if (HDATA(instance)->dma_dir && SCpnt) 146 memcpy (SCpnt->SCp.ptr, 147 HDATA(instance)->dma_bounce_buffer, 148 SCpnt->SCp.this_residual); 149 kfree (HDATA(instance)->dma_bounce_buffer); 150 HDATA(instance)->dma_bounce_buffer = NULL; 151 HDATA(instance)->dma_bounce_len = 0; 152 } else { 153 kfree (HDATA(instance)->dma_bounce_buffer); 154 HDATA(instance)->dma_bounce_buffer = NULL; 155 HDATA(instance)->dma_bounce_len = 0; 156 } 157 } 158 } 159 160 int __init a3000_detect(struct scsi_host_template *tpnt) 161 { 162 wd33c93_regs regs; 163 164 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) 165 return 0; 166 if (!request_mem_region(0xDD0000, 256, "wd33c93")) 167 return 0; 168 169 tpnt->proc_name = "A3000"; 170 tpnt->proc_info = &wd33c93_proc_info; 171 172 a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); 173 if (a3000_host == NULL) 174 goto fail_register; 175 176 a3000_host->base = ZTWO_VADDR(0xDD0000); 177 a3000_host->irq = IRQ_AMIGA_PORTS; 178 DMA(a3000_host)->DAWR = DAWR_A3000; 179 regs.SASR = &(DMA(a3000_host)->SASR); 180 regs.SCMD = &(DMA(a3000_host)->SCMD); 181 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); 182 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI", 183 a3000_intr)) 184 goto fail_irq; 185 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; 186 187 return 1; 188 189 fail_irq: 190 wd33c93_release(); 191 scsi_unregister(a3000_host); 192 fail_register: 193 release_mem_region(0xDD0000, 256); 194 return 0; 195 } 196 197 static int a3000_bus_reset(struct scsi_cmnd *cmd) 198 { 199 /* FIXME perform bus-specific reset */ 200 201 /* FIXME 2: kill this entire function, which should 202 cause mid-layer to call wd33c93_host_reset anyway? */ 203 204 spin_lock_irq(cmd->device->host->host_lock); 205 wd33c93_host_reset(cmd); 206 spin_unlock_irq(cmd->device->host->host_lock); 207 208 return SUCCESS; 209 } 210 211 #define HOSTS_C 212 213 static struct scsi_host_template driver_template = { 214 .proc_name = "A3000", 215 .name = "Amiga 3000 built-in SCSI", 216 .detect = a3000_detect, 217 .release = a3000_release, 218 .queuecommand = wd33c93_queuecommand, 219 .eh_abort_handler = wd33c93_abort, 220 .eh_bus_reset_handler = a3000_bus_reset, 221 .eh_host_reset_handler = wd33c93_host_reset, 222 .can_queue = CAN_QUEUE, 223 .this_id = 7, 224 .sg_tablesize = SG_ALL, 225 .cmd_per_lun = CMD_PER_LUN, 226 .use_clustering = ENABLE_CLUSTERING 227 }; 228 229 230 #include "scsi_module.c" 231 232 int a3000_release(struct Scsi_Host *instance) 233 { 234 wd33c93_release(); 235 DMA(instance)->CNTR = 0; 236 release_mem_region(0xDD0000, 256); 237 free_irq(IRQ_AMIGA_PORTS, a3000_intr); 238 return 1; 239 } 240 241 MODULE_LICENSE("GPL"); 242