| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | .use_clustering = ENABLE_CLUSTERING |
| 82 | }; |
| 83 | |
| 84 | static struct Scsi_Host *mvme147_shost; |
| 85 | |
| 86 | static int __init mvme147_init(void) |
| 87 | { |
| 88 | wd33c93_regs regs; |
| 89 | struct WD33C93_hostdata *hdata; |
| 90 | int error = -ENOMEM; |
| 91 | |
| 92 | if (!MACH_IS_MVME147) |
| 93 | return 0; |
| 94 | |
| 95 | mvme147_shost = scsi_host_alloc(&mvme147_host_template, |
| 96 | sizeof(struct WD33C93_hostdata)); |
| 97 | if (!mvme147_shost) |
| 98 | goto err_out; |
| 99 | mvme147_shost->base = 0xfffe4000; |
| 100 | mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; |
| 101 | |
| 102 | regs.SASR = (volatile unsigned char *)0xfffe4000; |
| 103 | regs.SCMD = (volatile unsigned char *)0xfffe4001; |
| 104 | |
| 105 | hdata = shost_priv(mvme147_shost); |
| 106 | hdata->no_sync = 0xff; |
| 107 | hdata->fast = 0; |
| 108 | hdata->dma_mode = CTRL_DMA; |
| 109 | |
| 110 | wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); |
| 111 | |
| 112 | error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, |
| 113 | "MVME147 SCSI PORT", mvme147_shost); |
| 114 | if (error) |
| 115 | goto err_unregister; |
| 116 | error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, |
| 117 | "MVME147 SCSI DMA", mvme147_shost); |
| 118 | if (error) |
| 119 | goto err_free_irq; |
| 120 | #if 0 /* Disabled; causes problems booting */ |
| 121 | m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ |
| 122 | udelay(100); |
| 123 | m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ |
| 124 | udelay(2000); |
| 125 | m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ |
| 126 | #endif |
| 127 | m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ |
| 128 | |
| 129 | m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ |
| 130 | m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ |
| 131 | |
| 132 | error = scsi_add_host(mvme147_shost, NULL); |
| 133 | if (error) |
| 134 | goto err_free_irq; |
| 135 | scsi_scan_host(mvme147_shost); |
| 136 | return 0; |
| 137 | |
| 138 | err_free_irq: |
| 139 | free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); |
| 140 | err_unregister: |
| 141 | scsi_host_put(mvme147_shost); |
| 142 | err_out: |
| 143 | return error; |
| 144 | } |
| 145 | |
| 146 | static void __exit mvme147_exit(void) |
| 147 | { |
| 148 | scsi_remove_host(mvme147_shost); |
| 149 | |
| 150 | /* XXX Make sure DMA is stopped! */ |
| 151 | free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); |
| 152 | free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); |
| 153 | |
| 154 | scsi_host_put(mvme147_shost); |
| 155 | } |
| 156 | |
| 157 | module_init(mvme147_init); |
| 158 | module_exit(mvme147_exit); |