1 #include <linux/types.h> 2 #include <linux/mm.h> 3 #include <linux/blkdev.h> 4 #include <linux/interrupt.h> 5 6 #include <asm/page.h> 7 #include <asm/pgtable.h> 8 #include <asm/mvme147hw.h> 9 #include <asm/irq.h> 10 11 #include "scsi.h" 12 #include <scsi/scsi_host.h> 13 #include "wd33c93.h" 14 #include "mvme147.h" 15 16 #include<linux/stat.h> 17 18 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) 19 20 static struct Scsi_Host *mvme147_host = NULL; 21 22 static irqreturn_t mvme147_intr (int irq, void *dummy) 23 { 24 if (irq == MVME147_IRQ_SCSI_PORT) 25 wd33c93_intr (mvme147_host); 26 else 27 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 28 return IRQ_HANDLED; 29 } 30 31 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 32 { 33 unsigned char flags = 0x01; 34 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 35 36 /* setup dma direction */ 37 if (!dir_in) 38 flags |= 0x04; 39 40 /* remember direction */ 41 HDATA(mvme147_host)->dma_dir = dir_in; 42 43 if (dir_in) 44 /* invalidate any cache */ 45 cache_clear (addr, cmd->SCp.this_residual); 46 else 47 /* push any dirty cache */ 48 cache_push (addr, cmd->SCp.this_residual); 49 50 /* start DMA */ 51 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1<<24); 52 m147_pcc->dma_dadr = addr; 53 m147_pcc->dma_cntrl = flags; 54 55 /* return success */ 56 return 0; 57 } 58 59 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 60 int status) 61 { 62 m147_pcc->dma_cntrl = 0; 63 } 64 65 int mvme147_detect(struct scsi_host_template *tpnt) 66 { 67 static unsigned char called = 0; 68 wd33c93_regs regs; 69 70 if (!MACH_IS_MVME147 || called) 71 return 0; 72 called++; 73 74 tpnt->proc_name = "MVME147"; 75 tpnt->proc_info = &wd33c93_proc_info; 76 77 mvme147_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); 78 if (!mvme147_host) 79 goto err_out; 80 81 mvme147_host->base = 0xfffe4000; 82 mvme147_host->irq = MVME147_IRQ_SCSI_PORT; 83 regs.SASR = (volatile unsigned char *)0xfffe4000; 84 regs.SCMD = (volatile unsigned char *)0xfffe4001; 85 HDATA(mvme147_host)->no_sync = 0xff; 86 HDATA(mvme147_host)->fast = 0; 87 HDATA(mvme147_host)->dma_mode = CTRL_DMA; 88 wd33c93_init(mvme147_host, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 89 90 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_intr)) 91 goto err_unregister; 92 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_intr)) 93 goto err_free_irq; 94 #if 0 /* Disabled; causes problems booting */ 95 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 96 udelay(100); 97 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 98 udelay(2000); 99 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 100 #endif 101 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 102 103 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 104 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 105 106 return 1; 107 108 err_free_irq: 109 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 110 err_unregister: 111 wd33c93_release(); 112 scsi_unregister(mvme147_host); 113 err_out: 114 return 0; 115 } 116 117 static int mvme147_bus_reset(struct scsi_cmnd *cmd) 118 { 119 /* FIXME perform bus-specific reset */ 120 121 /* FIXME 2: kill this function, and let midlayer fallback to 122 the same result, calling wd33c93_host_reset() */ 123 124 spin_lock_irq(cmd->device->host->host_lock); 125 wd33c93_host_reset(cmd); 126 spin_unlock_irq(cmd->device->host->host_lock); 127 128 return SUCCESS; 129 } 130 131 #define HOSTS_C 132 133 #include "mvme147.h" 134 135 static struct scsi_host_template driver_template = { 136 .proc_name = "MVME147", 137 .name = "MVME147 built-in SCSI", 138 .detect = mvme147_detect, 139 .release = mvme147_release, 140 .queuecommand = wd33c93_queuecommand, 141 .eh_abort_handler = wd33c93_abort, 142 .eh_bus_reset_handler = mvme147_bus_reset, 143 .eh_host_reset_handler = wd33c93_host_reset, 144 .can_queue = CAN_QUEUE, 145 .this_id = 7, 146 .sg_tablesize = SG_ALL, 147 .cmd_per_lun = CMD_PER_LUN, 148 .use_clustering = ENABLE_CLUSTERING 149 }; 150 151 152 #include "scsi_module.c" 153 154 int mvme147_release(struct Scsi_Host *instance) 155 { 156 #ifdef MODULE 157 /* XXX Make sure DMA is stopped! */ 158 wd33c93_release(); 159 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 160 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr); 161 #endif 162 return 1; 163 } 164