// SPDX-License-Identifier: GPL-2.0 #include <linux/types.h> #include <linux/mm.h> #include <linux/blkdev.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/mvme147hw.h> #include <asm/irq.h> #include "scsi.h" #include <scsi/scsi_host.h> #include "wd33c93.h" #include "mvme147.h" static irqreturn_t mvme147_intr(int irq, void *data) { struct Scsi_Host *instance = data; if (irq == MVME147_IRQ_SCSI_PORT) wd33c93_intr(instance); else m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ return IRQ_HANDLED; } static int dma_setup(struct scsi_cmnd *cmd, int dir_in) { struct Scsi_Host *instance = cmd->device->host; struct WD33C93_hostdata *hdata = shost_priv(instance); unsigned char flags = 0x01; unsigned long addr = virt_to_bus(cmd->SCp.ptr); /* setup dma direction */ if (!dir_in) flags |= 0x04; /* remember direction */ hdata->dma_dir = dir_in; if (dir_in) { /* invalidate any cache */ cache_clear(addr, cmd->SCp.this_residual); } else { /* push any dirty cache */ cache_push(addr, cmd->SCp.this_residual); } /* start DMA */ m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24); m147_pcc->dma_dadr = addr; m147_pcc->dma_cntrl = flags; /* return success */ return 0; } static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, int status) { m147_pcc->dma_cntrl = 0; } static struct scsi_host_template mvme147_host_template = { .module = THIS_MODULE, .proc_name = "MVME147", .name = "MVME147 built-in SCSI", .queuecommand = wd33c93_queuecommand, .eh_abort_handler = wd33c93_abort, .eh_host_reset_handler = wd33c93_host_reset, .show_info = wd33c93_show_info, .write_info = wd33c93_write_info, .can_queue = CAN_QUEUE, .this_id = 7, .sg_tablesize = SG_ALL, .cmd_per_lun = CMD_PER_LUN, }; static struct Scsi_Host *mvme147_shost; static int __init mvme147_init(void) { wd33c93_regs regs; struct WD33C93_hostdata *hdata; int error = -ENOMEM; if (!MACH_IS_MVME147) return 0; mvme147_shost = scsi_host_alloc(&mvme147_host_template, sizeof(struct WD33C93_hostdata)); if (!mvme147_shost) goto err_out; mvme147_shost->base = 0xfffe4000; mvme147_shost->irq = MVME147_IRQ_SCSI_PORT; regs.SASR = (volatile unsigned char *)0xfffe4000; regs.SCMD = (volatile unsigned char *)0xfffe4001; hdata = shost_priv(mvme147_shost); hdata->no_sync = 0xff; hdata->fast = 0; hdata->dma_mode = CTRL_DMA; wd33c93_init(mvme147_shost, regs, dma_setup, dma_stop, WD33C93_FS_8_10); error = request_irq(MVME147_IRQ_SCSI_PORT, mvme147_intr, 0, "MVME147 SCSI PORT", mvme147_shost); if (error) goto err_unregister; error = request_irq(MVME147_IRQ_SCSI_DMA, mvme147_intr, 0, "MVME147 SCSI DMA", mvme147_shost); if (error) goto err_free_irq; #if 0 /* Disabled; causes problems booting */ m147_pcc->scsi_interrupt = 0x10; /* Assert SCSI bus reset */ udelay(100); m147_pcc->scsi_interrupt = 0x00; /* Negate SCSI bus reset */ udelay(2000); m147_pcc->scsi_interrupt = 0x40; /* Clear bus reset interrupt */ #endif m147_pcc->scsi_interrupt = 0x09; /* Enable interrupt */ m147_pcc->dma_cntrl = 0x00; /* ensure DMA is stopped */ m147_pcc->dma_intr = 0x89; /* Ack and enable ints */ error = scsi_add_host(mvme147_shost, NULL); if (error) goto err_free_irq; scsi_scan_host(mvme147_shost); return 0; err_free_irq: free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); err_unregister: scsi_host_put(mvme147_shost); err_out: return error; } static void __exit mvme147_exit(void) { scsi_remove_host(mvme147_shost); /* XXX Make sure DMA is stopped! */ free_irq(MVME147_IRQ_SCSI_PORT, mvme147_shost); free_irq(MVME147_IRQ_SCSI_DMA, mvme147_shost); scsi_host_put(mvme147_shost); } module_init(mvme147_init); module_exit(mvme147_exit);