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/mvme147hw.h> 12 #include <asm/irq.h> 13 14 #include <scsi/scsi.h> 15 #include <scsi/scsi_cmnd.h> 16 #include <scsi/scsi_device.h> 17 #include <scsi/scsi_eh.h> 18 #include <scsi/scsi_host.h> 19 #include <scsi/scsi_tcq.h> 20 #include "wd33c93.h" 21 #include "mvme147.h" 22 23 static irqreturn_t mvme147_intr(int irq, void *data) 24 { 25 struct Scsi_Host *instance = data; 26 27 if (irq == MVME147_IRQ_SCSI_PORT) 28 wd33c93_intr(instance); 29 else 30 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 31 return IRQ_HANDLED; 32 } 33 34 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 35 { 36 struct Scsi_Host *instance = cmd->device->host; 37 struct WD33C93_hostdata *hdata = shost_priv(instance); 38 unsigned char flags = 0x01; 39 unsigned long addr = virt_to_bus(cmd->SCp.ptr); 40 41 /* setup dma direction */ 42 if (!dir_in) 43 flags |= 0x04; 44 45 /* remember direction */ 46 hdata->dma_dir = dir_in; 47 48 if (dir_in) { 49 /* invalidate any cache */ 50 cache_clear(addr, cmd->SCp.this_residual); 51 } else { 52 /* push any dirty cache */ 53 cache_push(addr, cmd->SCp.this_residual); 54 } 55 56 /* start DMA */ 57 m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24); 58 m147_pcc->dma_dadr = addr; 59 m147_pcc->dma_cntrl = flags; 60 61 /* return success */ 62 return 0; 63 } 64 65 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 66 int status) 67 { 68 m147_pcc->dma_cntrl = 0; 69 } 70 71 static struct scsi_host_template mvme147_host_template = { 72 .module = THIS_MODULE, 73 .proc_name = "MVME147", 74 .name = "MVME147 built-in SCSI", 75 .queuecommand = wd33c93_queuecommand, 76 .eh_abort_handler = wd33c93_abort, 77 .eh_host_reset_handler = wd33c93_host_reset, 78 .show_info = wd33c93_show_info, 79 .write_info = wd33c93_write_info, 80 .can_queue = CAN_QUEUE, 81 .this_id = 7, 82 .sg_tablesize = SG_ALL, 83 .cmd_per_lun = CMD_PER_LUN, 84 }; 85 86 static struct Scsi_Host *mvme147_shost; 87 88 static int __init mvme147_init(void) 89 { 90 wd33c93_regs regs; 91 struct WD33C93_hostdata *hdata; 92 int error = -ENOMEM; 93 94 if (!MACH_IS_MVME147) 95 return 0; 96 97 mvme147_shost = scsi_host_alloc(&mvme147_host_template, 98 sizeof(struct WD33C93_hostdata)); 99 if (!mvme147_shost) 100 goto err_out; 101 mvme147_shost->base = 0xfffe4000; 102 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; 103 104 regs.SASR = (volatile unsigned char *)0xfffe4000; 105 regs.SCMD = (volatile unsigned char *)0xfffe4001; 106 107 hdata = shost_priv(mvme147_shost); 108 hdata->no_sync = 0xff; 109 hdata->fast = 0; 110 hdata->dma_mode = CTRL_DMA; 111 112 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 113 114 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 115 "MVME147 SCSI PORT", mvme147_shost); 116 if (error) 117 goto err_unregister; 118 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 119 "MVME147 SCSI DMA", mvme147_shost); 120 if (error) 121 goto err_free_irq; 122 #if 0 /* Disabled; causes problems booting */ 123 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 124 udelay(100); 125 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 126 udelay(2000); 127 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 128 #endif 129 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 130 131 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 132 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 133 134 error = scsi_add_host(mvme147_shost, NULL); 135 if (error) 136 goto err_free_irq; 137 scsi_scan_host(mvme147_shost); 138 return 0; 139 140 err_free_irq: 141 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 142 err_unregister: 143 scsi_host_put(mvme147_shost); 144 err_out: 145 return error; 146 } 147 148 static void __exit mvme147_exit(void) 149 { 150 scsi_remove_host(mvme147_shost); 151 152 /* XXX Make sure DMA is stopped! */ 153 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 154 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); 155 156 scsi_host_put(mvme147_shost); 157 } 158 159 module_init(mvme147_init); 160 module_exit(mvme147_exit); 161