| // SPDX-License-Identifier: GPL-2.0-only |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/module.h> |
| |
| #include <asm/page.h> |
| #include <asm/amigaints.h> |
| #include <asm/amigahw.h> |
| |
| #include "scsi.h" |
| #include "wd33c93.h" |
| #include "a3000.h" |
| |
| |
| struct a3000_hostdata { |
| struct WD33C93_hostdata wh; |
| struct a3000_scsiregs *regs; |
| }; |
| |
| static irqreturn_t a3000_intr(int irq, void *data) |
| { |
| struct Scsi_Host *instance = data; |
| struct a3000_hostdata *hdata = shost_priv(instance); |
| unsigned int status = hdata->regs->ISTR; |
| unsigned long flags; |
| |
| if (!(status & ISTR_INT_P)) |
| return IRQ_NONE; |
| if (status & ISTR_INTS) { |
| spin_lock_irqsave(instance->host_lock, flags); |
| wd33c93_intr(instance); |
| spin_unlock_irqrestore(instance->host_lock, flags); |
| return IRQ_HANDLED; |
| } |
| pr_warn("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); |
| return IRQ_NONE; |
| } |
| |
| static int dma_setup(struct scsi_cmnd *cmd, int dir_in) |
| { |
| struct Scsi_Host *instance = cmd->device->host; |
| struct a3000_hostdata *hdata = shost_priv(instance); |
| struct WD33C93_hostdata *wh = &hdata->wh; |
| struct a3000_scsiregs *regs = hdata->regs; |
| unsigned short cntr = CNTR_PDMD | CNTR_INTEN; |
| unsigned long addr = virt_to_bus(cmd->SCp.ptr); |
| |
| /* |
| * if the physical address has the wrong alignment, or if |
| * physical address is bad, or if it is a write and at the |
| * end of a physical memory chunk, then allocate a bounce |
| * buffer |
| */ |
| if (addr & A3000_XFER_MASK) { |
| wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff; |
| wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len, |
| GFP_KERNEL); |
| |
| /* can't allocate memory; use PIO */ |
| if (!wh->dma_bounce_buffer) { |
| wh->dma_bounce_len = 0; |
| return 1; |
| } |
| |
| if (!dir_in) { |
| /* copy to bounce buffer for a write */ |
| memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr, |
| cmd->SCp.this_residual); |
| } |
| |
| addr = virt_to_bus(wh->dma_bounce_buffer); |
| } |
| |
| /* setup dma direction */ |
| if (!dir_in) |
| cntr |= CNTR_DDIR; |
| |
| /* remember direction */ |
| wh->dma_dir = dir_in; |
| |
| regs->CNTR = cntr; |
| |
| /* setup DMA *physical* address */ |
| regs->ACR = addr; |
| |
| 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 */ |
| mb(); /* make sure setup is completed */ |
| regs->ST_DMA = 1; |
| mb(); /* make sure DMA has started before next IO */ |
| |
| /* return success */ |
| return 0; |
| } |
| |
| static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, |
| int status) |
| { |
| struct a3000_hostdata *hdata = shost_priv(instance); |
| struct WD33C93_hostdata *wh = &hdata->wh; |
| struct a3000_scsiregs *regs = hdata->regs; |
| |
| /* disable SCSI interrupts */ |
| unsigned short cntr = CNTR_PDMD; |
| |
| if (!wh->dma_dir) |
| cntr |= CNTR_DDIR; |
| |
| regs->CNTR = cntr; |
| mb(); /* make sure CNTR is updated before next IO */ |
| |
| /* flush if we were reading */ |
| if (wh->dma_dir) { |
| regs->FLUSH = 1; |
| mb(); /* don't allow prefetch */ |
| while (!(regs->ISTR & ISTR_FE_FLG)) |
| barrier(); |
| mb(); /* no IO until FLUSH is done */ |
| } |
| |
| /* clear a possible interrupt */ |
| /* I think that this CINT is only necessary if you are |
| * using the terminal count features. HM 7 Mar 1994 |
| */ |
| regs->CINT = 1; |
| |
| /* stop DMA */ |
| regs->SP_DMA = 1; |
| mb(); /* make sure DMA is stopped before next IO */ |
| |
| /* restore the CONTROL bits (minus the direction flag) */ |
| regs->CNTR = CNTR_PDMD | CNTR_INTEN; |
| mb(); /* make sure CNTR is updated before next IO */ |
| |
| /* copy from a bounce buffer, if necessary */ |
| if (status && wh->dma_bounce_buffer) { |
| if (SCpnt) { |
| if (wh->dma_dir && SCpnt) |
| memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer, |
| SCpnt->SCp.this_residual); |
| kfree(wh->dma_bounce_buffer); |
| wh->dma_bounce_buffer = NULL; |
| wh->dma_bounce_len = 0; |
| } else { |
| kfree(wh->dma_bounce_buffer); |
| wh->dma_bounce_buffer = NULL; |
| wh->dma_bounce_len = 0; |
| } |
| } |
| } |
| |
| static struct scsi_host_template amiga_a3000_scsi_template = { |
| .module = THIS_MODULE, |
| .name = "Amiga 3000 built-in SCSI", |
| .show_info = wd33c93_show_info, |
| .write_info = wd33c93_write_info, |
| .proc_name = "A3000", |
| .queuecommand = wd33c93_queuecommand, |
| .eh_abort_handler = wd33c93_abort, |
| .eh_host_reset_handler = wd33c93_host_reset, |
| .can_queue = CAN_QUEUE, |
| .this_id = 7, |
| .sg_tablesize = SG_ALL, |
| .cmd_per_lun = CMD_PER_LUN, |
| }; |
| |
| static int __init amiga_a3000_scsi_probe(struct platform_device *pdev) |
| { |
| struct resource *res; |
| struct Scsi_Host *instance; |
| int error; |
| struct a3000_scsiregs *regs; |
| wd33c93_regs wdregs; |
| struct a3000_hostdata *hdata; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -ENODEV; |
| |
| if (!request_mem_region(res->start, resource_size(res), "wd33c93")) |
| return -EBUSY; |
| |
| instance = scsi_host_alloc(&amiga_a3000_scsi_template, |
| sizeof(struct a3000_hostdata)); |
| if (!instance) { |
| error = -ENOMEM; |
| goto fail_alloc; |
| } |
| |
| instance->irq = IRQ_AMIGA_PORTS; |
| |
| regs = ZTWO_VADDR(res->start); |
| regs->DAWR = DAWR_A3000; |
| |
| wdregs.SASR = ®s->SASR; |
| wdregs.SCMD = ®s->SCMD; |
| |
| hdata = shost_priv(instance); |
| hdata->wh.no_sync = 0xff; |
| hdata->wh.fast = 0; |
| hdata->wh.dma_mode = CTRL_DMA; |
| hdata->regs = regs; |
| |
| wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15); |
| error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, |
| "A3000 SCSI", instance); |
| if (error) |
| goto fail_irq; |
| |
| regs->CNTR = CNTR_PDMD | CNTR_INTEN; |
| |
| error = scsi_add_host(instance, NULL); |
| if (error) |
| goto fail_host; |
| |
| platform_set_drvdata(pdev, instance); |
| |
| scsi_scan_host(instance); |
| return 0; |
| |
| fail_host: |
| free_irq(IRQ_AMIGA_PORTS, instance); |
| fail_irq: |
| scsi_host_put(instance); |
| fail_alloc: |
| release_mem_region(res->start, resource_size(res)); |
| return error; |
| } |
| |
| static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev) |
| { |
| struct Scsi_Host *instance = platform_get_drvdata(pdev); |
| struct a3000_hostdata *hdata = shost_priv(instance); |
| struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| |
| hdata->regs->CNTR = 0; |
| scsi_remove_host(instance); |
| free_irq(IRQ_AMIGA_PORTS, instance); |
| scsi_host_put(instance); |
| release_mem_region(res->start, resource_size(res)); |
| return 0; |
| } |
| |
| static struct platform_driver amiga_a3000_scsi_driver = { |
| .remove = __exit_p(amiga_a3000_scsi_remove), |
| .driver = { |
| .name = "amiga-a3000-scsi", |
| }, |
| }; |
| |
| module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe); |
| |
| MODULE_DESCRIPTION("Amiga 3000 built-in SCSI"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:amiga-a3000-scsi"); |