1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <linux/mm.h> 4 #include <linux/blkdev.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 20 static irqreturn_t mvme147_intr(int irq, void *data) 21 { 22 struct Scsi_Host *instance = data; 23 24 if (irq == MVME147_IRQ_SCSI_PORT) 25 wd33c93_intr(instance); 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 struct Scsi_Host *instance = cmd->device->host; 34 struct WD33C93_hostdata *hdata = shost_priv(instance); 35 unsigned char flags = 0x01; 36 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 37 38 /* setup dma direction */ 39 if (!dir_in) 40 flags |= 0x04; 41 42 /* remember direction */ 43 hdata->dma_dir = dir_in; 44 45 if (dir_in) { 46 /* invalidate any cache */ 47 cache_clear(addr, cmd->SCp.this_residual); 48 } else { 49 /* push any dirty cache */ 50 cache_push(addr, cmd->SCp.this_residual); 51 } 52 53 /* start DMA */ 54 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24); 55 m147_pcc->dma_dadr = addr; 56 m147_pcc->dma_cntrl = flags; 57 58 /* return success */ 59 return 0; 60 } 61 62 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 63 int status) 64 { 65 m147_pcc->dma_cntrl = 0; 66 } 67 68 int mvme147_detect(struct scsi_host_template *tpnt) 69 { 70 static unsigned char called = 0; 71 struct Scsi_Host *instance; 72 wd33c93_regs regs; 73 struct WD33C93_hostdata *hdata; 74 75 if (!MACH_IS_MVME147 || called) 76 return 0; 77 called++; 78 79 tpnt->proc_name = "MVME147"; 80 tpnt->show_info = wd33c93_show_info, 81 tpnt->write_info = wd33c93_write_info, 82 83 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata)); 84 if (!instance) 85 goto err_out; 86 87 instance->base = 0xfffe4000; 88 instance->irq = MVME147_IRQ_SCSI_PORT; 89 regs.SASR = (volatile unsigned char *)0xfffe4000; 90 regs.SCMD = (volatile unsigned char *)0xfffe4001; 91 hdata = shost_priv(instance); 92 hdata->no_sync = 0xff; 93 hdata->fast = 0; 94 hdata->dma_mode = CTRL_DMA; 95 wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 96 97 if (request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 98 "MVME147 SCSI PORT", instance)) 99 goto err_unregister; 100 if (request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 101 "MVME147 SCSI DMA", instance)) 102 goto err_free_irq; 103 #if 0 /* Disabled; causes problems booting */ 104 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 105 udelay(100); 106 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 107 udelay(2000); 108 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 109 #endif 110 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 111 112 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 113 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 114 115 return 1; 116 117 err_free_irq: 118 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 119 err_unregister: 120 scsi_unregister(instance); 121 err_out: 122 return 0; 123 } 124 125 static struct scsi_host_template driver_template = { 126 .proc_name = "MVME147", 127 .name = "MVME147 built-in SCSI", 128 .detect = mvme147_detect, 129 .release = mvme147_release, 130 .queuecommand = wd33c93_queuecommand, 131 .eh_abort_handler = wd33c93_abort, 132 .eh_host_reset_handler = wd33c93_host_reset, 133 .can_queue = CAN_QUEUE, 134 .this_id = 7, 135 .sg_tablesize = SG_ALL, 136 .cmd_per_lun = CMD_PER_LUN, 137 .use_clustering = ENABLE_CLUSTERING 138 }; 139 140 141 #include "scsi_module.c" 142 143 int mvme147_release(struct Scsi_Host *instance) 144 { 145 #ifdef MODULE 146 /* XXX Make sure DMA is stopped! */ 147 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr); 148 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr); 149 #endif 150 return 1; 151 } 152