1#include <linux/types.h> 2#include <linux/mm.h> 3#include <linux/blk.h> 4#include <linux/sched.h> 5#include <linux/version.h> 6#include <linux/ioport.h> 7#include <linux/init.h> 8#include <linux/spinlock.h> 9 10#include <asm/setup.h> 11#include <asm/page.h> 12#include <asm/pgtable.h> 13#include <asm/amigaints.h> 14#include <asm/amigahw.h> 15#include <asm/irq.h> 16 17#include "scsi.h" 18#include "hosts.h" 19#include "wd33c93.h" 20#include "a3000.h" 21 22#include<linux/stat.h> 23 24#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base)) 25#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) 26 27static struct Scsi_Host *a3000_host = NULL; 28 29static void a3000_intr (int irq, void *dummy, struct pt_regs *fp) 30{ 31 unsigned long flags; 32 unsigned int status = DMA(a3000_host)->ISTR; 33 34 if (!(status & ISTR_INT_P)) 35 return; 36 if (status & ISTR_INTS) 37 { 38 spin_lock_irqsave(&io_request_lock, flags); 39 wd33c93_intr (a3000_host); 40 spin_unlock_irqrestore(&io_request_lock, flags); 41 } else 42 printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", 43 status); 44} 45 46static int dma_setup (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 (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) 59 { 60 HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511) 61 & ~0x1ff; 62 HDATA(a3000_host)->dma_bounce_buffer = 63 scsi_malloc (HDATA(a3000_host)->dma_bounce_len); 64 65 /* can't allocate memory; use PIO */ 66 if (!HDATA(a3000_host)->dma_bounce_buffer) { 67 HDATA(a3000_host)->dma_bounce_len = 0; 68 return 1; 69 } 70 71 if (!dir_in) { 72 /* copy to bounce buffer for a write */ 73 if (cmd->use_sg) { 74 memcpy (HDATA(a3000_host)->dma_bounce_buffer, 75 cmd->SCp.ptr, cmd->SCp.this_residual); 76 } else 77 memcpy (HDATA(a3000_host)->dma_bounce_buffer, 78 cmd->request_buffer, cmd->request_bufflen); 79 } 80 81 addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer); 82 } 83 84 /* setup dma direction */ 85 if (!dir_in) 86 cntr |= CNTR_DDIR; 87 88 /* remember direction */ 89 HDATA(a3000_host)->dma_dir = dir_in; 90 91 DMA(a3000_host)->CNTR = cntr; 92 93 /* setup DMA *physical* address */ 94 DMA(a3000_host)->ACR = addr; 95 96 if (dir_in) 97 /* invalidate any cache */ 98 cache_clear (addr, cmd->SCp.this_residual); 99 else 100 /* push any dirty cache */ 101 cache_push (addr, cmd->SCp.this_residual); 102 103 /* start DMA */ 104 mb(); /* make sure setup is completed */ 105 DMA(a3000_host)->ST_DMA = 1; 106 mb(); /* make sure DMA has started before next IO */ 107 108 /* return success */ 109 return 0; 110} 111 112static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, 113 int status) 114{ 115 /* disable SCSI interrupts */ 116 unsigned short cntr = CNTR_PDMD; 117 118 if (!HDATA(instance)->dma_dir) 119 cntr |= CNTR_DDIR; 120 121 DMA(instance)->CNTR = cntr; 122 mb(); /* make sure CNTR is updated before next IO */ 123 124 /* flush if we were reading */ 125 if (HDATA(instance)->dma_dir) { 126 DMA(instance)->FLUSH = 1; 127 mb(); /* don't allow prefetch */ 128 while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) 129 barrier(); 130 mb(); /* no IO until FLUSH is done */ 131 } 132 133 /* clear a possible interrupt */ 134 /* I think that this CINT is only necessary if you are 135 * using the terminal count features. HM 7 Mar 1994 136 */ 137 DMA(instance)->CINT = 1; 138 139 /* stop DMA */ 140 DMA(instance)->SP_DMA = 1; 141 mb(); /* make sure DMA is stopped before next IO */ 142 143 /* restore the CONTROL bits (minus the direction flag) */ 144 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; 145 mb(); /* make sure CNTR is updated before next IO */ 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 (HDATA(instance)->dma_dir && SCpnt) 151 memcpy (SCpnt->SCp.ptr, 152 HDATA(instance)->dma_bounce_buffer, 153 SCpnt->SCp.this_residual); 154 scsi_free (HDATA(instance)->dma_bounce_buffer, 155 HDATA(instance)->dma_bounce_len); 156 HDATA(instance)->dma_bounce_buffer = NULL; 157 HDATA(instance)->dma_bounce_len = 0; 158 } else { 159 if (HDATA(instance)->dma_dir && SCpnt) 160 memcpy (SCpnt->request_buffer, 161 HDATA(instance)->dma_bounce_buffer, 162 SCpnt->request_bufflen); 163 164 scsi_free (HDATA(instance)->dma_bounce_buffer, 165 HDATA(instance)->dma_bounce_len); 166 HDATA(instance)->dma_bounce_buffer = NULL; 167 HDATA(instance)->dma_bounce_len = 0; 168 } 169 } 170} 171 172int __init a3000_detect(Scsi_Host_Template *tpnt) 173{ 174 wd33c93_regs regs; 175 176 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) 177 return 0; 178 if (!request_mem_region(0xDD0000, 256, "wd33c93")) 179 return 0; 180 181 tpnt->proc_name = "A3000"; 182 tpnt->proc_info = &wd33c93_proc_info; 183 184 a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); 185 if (a3000_host == NULL) 186 goto fail_register; 187 188 a3000_host->base = ZTWO_VADDR(0xDD0000); 189 a3000_host->irq = IRQ_AMIGA_PORTS; 190 DMA(a3000_host)->DAWR = DAWR_A3000; 191 regs.SASR = &(DMA(a3000_host)->SASR); 192 regs.SCMD = &(DMA(a3000_host)->SCMD); 193 wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); 194 if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI", 195 a3000_intr)) 196 goto fail_irq; 197 DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; 198 199 return 1; 200 201fail_irq: 202 wd33c93_release(); 203 scsi_unregister(a3000_host); 204fail_register: 205 release_mem_region(0xDD0000, 256); 206 return 0; 207} 208 209#define HOSTS_C 210 211static Scsi_Host_Template driver_template = _A3000_SCSI; 212 213#include "scsi_module.c" 214 215int __exit a3000_release(struct Scsi_Host *instance) 216{ 217 wd33c93_release(); 218 DMA(instance)->CNTR = 0; 219 release_mem_region(0xDD0000, 256); 220 free_irq(IRQ_AMIGA_PORTS, a3000_intr); 221 return 1; 222} 223 224MODULE_LICENSE("GPL"); 225