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 19 static irqreturn_t mvme147_intr(int irq, void *data) 20 { 21 struct Scsi_Host *instance = data; 22 23 if (irq == MVME147_IRQ_SCSI_PORT) 24 wd33c93_intr(instance); 25 else 26 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 27 return IRQ_HANDLED; 28 } 29 30 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 31 { 32 struct Scsi_Host *instance = cmd->device->host; 33 struct WD33C93_hostdata *hdata = shost_priv(instance); 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->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 52 /* start DMA */ 53 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24); 54 m147_pcc->dma_dadr = addr; 55 m147_pcc->dma_cntrl = flags; 56 57 /* return success */ 58 return 0; 59 } 60 61 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 62 int status) 63 { 64 m147_pcc->dma_cntrl = 0; 65 } 66 67 int mvme147_detect(struct scsi_host_template *tpnt) 68 { 69 static unsigned char called = 0; 70 struct Scsi_Host *instance; 71 wd33c93_regs regs; 72 struct WD33C93_hostdata *hdata; 73 74 if (!MACH_IS_MVME147 || called) 75 return 0; 76 called++; 77 78 tpnt->proc_name = "MVME147"; 79 tpnt->proc_info = &wd33c93_proc_info; 80 81 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata)); 82 if (!instance) 83 goto err_out; 84 85 instance->base = 0xfffe4000; 86 instance->irq = MVME147_IRQ_SCSI_PORT; 87 regs.SASR = (volatile unsigned char *)0xfffe4000; 88 regs.SCMD = (volatile unsigned char *)0xfffe4001; 89 hdata = shost_priv(instance); 90 hdata->no_sync = 0xff; 91 hdata->fast = 0; 92 hdata->dma_mode = CTRL_DMA; 93 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 94 95 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 96 "MVME147 SCSI PORT", instance)) 97 goto err_unregister; 98 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 99 "MVME147 SCSI DMA", instance)) 100 goto err_free_irq; 101 #if 0 /* Disabled; causes problems booting */ 102 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 103 udelay(100); 104 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 105 udelay(2000); 106 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 107 #endif 108 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 109 110 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 111 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 112 113 return 1; 114 115 err_free_irq: 116 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 117 err_unregister: 118 scsi_unregister(instance); 119 err_out: 120 return 0; 121 } 122 123 static int mvme147_bus_reset(struct scsi_cmnd *cmd) 124 { 125 /* FIXME perform bus-specific reset */ 126 127 /* FIXME 2: kill this function, and let midlayer fallback to 128 the same result, calling wd33c93_host_reset() */ 129 130 spin_lock_irq(cmd->device->host->host_lock); 131 wd33c93_host_reset(cmd); 132 spin_unlock_irq(cmd->device->host->host_lock); 133 134 return SUCCESS; 135 } 136 137 138 static struct scsi_host_template driver_template = { 139 .proc_name = "MVME147", 140 .name = "MVME147 built-in SCSI", 141 .detect = mvme147_detect, 142 .release = mvme147_release, 143 .queuecommand = wd33c93_queuecommand, 144 .eh_abort_handler = wd33c93_abort, 145 .eh_bus_reset_handler = mvme147_bus_reset, 146 .eh_host_reset_handler = wd33c93_host_reset, 147 .can_queue = CAN_QUEUE, 148 .this_id = 7, 149 .sg_tablesize = SG_ALL, 150 .cmd_per_lun = CMD_PER_LUN, 151 .use_clustering = ENABLE_CLUSTERING 152 }; 153 154 155 #include "scsi_module.c" 156 157 int mvme147_release(struct Scsi_Host *instance) 158 { 159 #ifdef MODULE 160 /* XXX Make sure DMA is stopped! */ 161 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 162 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr); 163 #endif 164 return 1; 165 } 166