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.h" 15#include <scsi/scsi_host.h> 16#include "wd33c93.h" 17#include "mvme147.h" 18 19static 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 30static 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 61static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 62 int status) 63{ 64 m147_pcc->dma_cntrl = 0; 65} 66 67static struct scsi_host_template mvme147_host_template = { 68 .module = THIS_MODULE, 69 .proc_name = "MVME147", 70 .name = "MVME147 built-in SCSI", 71 .queuecommand = wd33c93_queuecommand, 72 .eh_abort_handler = wd33c93_abort, 73 .eh_host_reset_handler = wd33c93_host_reset, 74 .show_info = wd33c93_show_info, 75 .write_info = wd33c93_write_info, 76 .can_queue = CAN_QUEUE, 77 .this_id = 7, 78 .sg_tablesize = SG_ALL, 79 .cmd_per_lun = CMD_PER_LUN, 80}; 81 82static struct Scsi_Host *mvme147_shost; 83 84static int __init mvme147_init(void) 85{ 86 wd33c93_regs regs; 87 struct WD33C93_hostdata *hdata; 88 int error = -ENOMEM; 89 90 if (!MACH_IS_MVME147) 91 return 0; 92 93 mvme147_shost = scsi_host_alloc(&mvme147_host_template, 94 sizeof(struct WD33C93_hostdata)); 95 if (!mvme147_shost) 96 goto err_out; 97 mvme147_shost->base = 0xfffe4000; 98 mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; 99 100 regs.SASR = (volatile unsigned char *)0xfffe4000; 101 regs.SCMD = (volatile unsigned char *)0xfffe4001; 102 103 hdata = shost_priv(mvme147_shost); 104 hdata->no_sync = 0xff; 105 hdata->fast = 0; 106 hdata->dma_mode = CTRL_DMA; 107 108 wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); 109 110 error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, 111 "MVME147 SCSI PORT", mvme147_shost); 112 if (error) 113 goto err_unregister; 114 error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, 115 "MVME147 SCSI DMA", mvme147_shost); 116 if (error) 117 goto err_free_irq; 118#if 0 /* Disabled; causes problems booting */ 119 m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ 120 udelay(100); 121 m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ 122 udelay(2000); 123 m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ 124#endif 125 m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ 126 127 m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ 128 m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ 129 130 error = scsi_add_host(mvme147_shost, NULL); 131 if (error) 132 goto err_free_irq; 133 scsi_scan_host(mvme147_shost); 134 return 0; 135 136err_free_irq: 137 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 138err_unregister: 139 scsi_host_put(mvme147_shost); 140err_out: 141 return error; 142} 143 144static void __exit mvme147_exit(void) 145{ 146 scsi_remove_host(mvme147_shost); 147 148 /* XXX Make sure DMA is stopped! */ 149 free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); 150 free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); 151 152 scsi_host_put(mvme147_shost); 153} 154 155module_init(mvme147_init); 156module_exit(mvme147_exit); 157