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 #include <linux/init.h> 7 #include <linux/kernel.h> 8 #include <linux/module.h> 9 10 #include <asm/page.h> 11 #include <asm/pgtable.h> 12 #include <asm/mvme147hw.h> 13 #include <asm/irq.h> 14 15 #include "scsi.h" 16 #include <scsi/scsi_host.h> 17 #include "wd33c93.h" 18 #include "mvme147.h" 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 static struct scsi_host_template mvme147_host_template = { 69 .module = THIS_MODULE, 70 .proc_name = "MVME147", 71 .name = "MVME147 built-in SCSI", 72 .queuecommand = wd33c93_queuecommand, 73 .eh_abort_handler = wd33c93_abort, 74 .eh_host_reset_handler = wd33c93_host_reset, 75 .show_info = wd33c93_show_info, 76 .write_info = wd33c93_write_info, 77 .can_queue = CAN_QUEUE, 78 .this_id = 7, 79 .sg_tablesize = SG_ALL, 80 .cmd_per_lun = CMD_PER_LUN, 81 }; 82 83 static struct Scsi_Host *mvme147_shost; 84 85 static int __init mvme147_init(void) 86 { 87 wd33c93_regs regs; 88 struct WD33C93_hostdata *hdata; 89 int error = -ENOMEM; 90 91 if (!MACH_IS_MVME147) 92 return 0; 93 94 mvme147_shost = scsi_host_alloc(&mvme147_host_template, 95 sizeof(struct WD33C93_hostdata)); 96 if (!mvme147_shost) 97 goto err_out; 98 mvme147_shost->base = 0xfffe4000; 99 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; 100 101 regs.SASR = (volatile unsigned char *)0xfffe4000; 102 regs.SCMD = (volatile unsigned char *)0xfffe4001; 103 104 hdata = shost_priv(mvme147_shost); 105 hdata->no_sync = 0xff; 106 hdata->fast = 0; 107 hdata->dma_mode = CTRL_DMA; 108 109 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 110 111 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 112 "MVME147 SCSI PORT", mvme147_shost); 113 if (error) 114 goto err_unregister; 115 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 116 "MVME147 SCSI DMA", mvme147_shost); 117 if (error) 118 goto err_free_irq; 119 #if 0 /* Disabled; causes problems booting */ 120 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 121 udelay(100); 122 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 123 udelay(2000); 124 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 125 #endif 126 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 127 128 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 129 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 130 131 error = scsi_add_host(mvme147_shost, NULL); 132 if (error) 133 goto err_free_irq; 134 scsi_scan_host(mvme147_shost); 135 return 0; 136 137 err_free_irq: 138 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 139 err_unregister: 140 scsi_host_put(mvme147_shost); 141 err_out: 142 return error; 143 } 144 145 static void __exit mvme147_exit(void) 146 { 147 scsi_remove_host(mvme147_shost); 148 149 /* XXX Make sure DMA is stopped! */ 150 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 151 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); 152 153 scsi_host_put(mvme147_shost); 154 } 155 156 module_init(mvme147_init); 157 module_exit(mvme147_exit); 158