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_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); 37 struct Scsi_Host *instance = cmd->device->host; 38 struct WD33C93_hostdata *hdata = shost_priv(instance); 39 unsigned char flags = 0x01; 40 unsigned long addr = virt_to_bus(scsi_pointer->ptr); 41 42 /* setup dma direction */ 43 if (!dir_in) 44 flags |= 0x04; 45 46 /* remember direction */ 47 hdata->dma_dir = dir_in; 48 49 if (dir_in) { 50 /* invalidate any cache */ 51 cache_clear(addr, scsi_pointer->this_residual); 52 } else { 53 /* push any dirty cache */ 54 cache_push(addr, scsi_pointer->this_residual); 55 } 56 57 /* start DMA */ 58 m147_pcc->dma_bcr = scsi_pointer->this_residual | (1 << 24); 59 m147_pcc->dma_dadr = addr; 60 m147_pcc->dma_cntrl = flags; 61 62 /* return success */ 63 return 0; 64 } 65 66 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 67 int status) 68 { 69 m147_pcc->dma_cntrl = 0; 70 } 71 72 static const struct scsi_host_template mvme147_host_template = { 73 .module = THIS_MODULE, 74 .proc_name = "MVME147", 75 .name = "MVME147 built-in SCSI", 76 .queuecommand = wd33c93_queuecommand, 77 .eh_abort_handler = wd33c93_abort, 78 .eh_host_reset_handler = wd33c93_host_reset, 79 .show_info = wd33c93_show_info, 80 .write_info = wd33c93_write_info, 81 .can_queue = CAN_QUEUE, 82 .this_id = 7, 83 .sg_tablesize = SG_ALL, 84 .cmd_per_lun = CMD_PER_LUN, 85 .cmd_size = sizeof(struct scsi_pointer), 86 }; 87 88 static struct Scsi_Host *mvme147_shost; 89 90 static int __init mvme147_init(void) 91 { 92 wd33c93_regs regs; 93 struct WD33C93_hostdata *hdata; 94 int error = -ENOMEM; 95 96 if (!MACH_IS_MVME147) 97 return 0; 98 99 mvme147_shost = scsi_host_alloc(&mvme147_host_template, 100 sizeof(struct WD33C93_hostdata)); 101 if (!mvme147_shost) 102 goto err_out; 103 mvme147_shost->base = 0xfffe4000; 104 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; 105 106 regs.SASR = (volatile unsigned char *)0xfffe4000; 107 regs.SCMD = (volatile unsigned char *)0xfffe4001; 108 109 hdata = shost_priv(mvme147_shost); 110 hdata->no_sync = 0xff; 111 hdata->fast = 0; 112 hdata->dma_mode = CTRL_DMA; 113 114 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 115 116 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 117 "MVME147 SCSI PORT", mvme147_shost); 118 if (error) 119 goto err_unregister; 120 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 121 "MVME147 SCSI DMA", mvme147_shost); 122 if (error) 123 goto err_free_irq; 124 #if 0 /* Disabled; causes problems booting */ 125 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 126 udelay(100); 127 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 128 udelay(2000); 129 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 130 #endif 131 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 132 133 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 134 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 135 136 error = scsi_add_host(mvme147_shost, NULL); 137 if (error) 138 goto err_free_irq; 139 scsi_scan_host(mvme147_shost); 140 return 0; 141 142 err_free_irq: 143 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 144 err_unregister: 145 scsi_host_put(mvme147_shost); 146 err_out: 147 return error; 148 } 149 150 static void __exit mvme147_exit(void) 151 { 152 scsi_remove_host(mvme147_shost); 153 154 /* XXX Make sure DMA is stopped! */ 155 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 156 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); 157 158 scsi_host_put(mvme147_shost); 159 } 160 161 module_init(mvme147_init); 162 module_exit(mvme147_exit); 163