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