// SPDX-License-Identifier: GPL-2.0 /* * Atari Falcon PATA controller driver * * Copyright (c) 2016 Samsung Electronics Co., Ltd. * http://www.samsung.com * * Based on falconide.c: * * Created 12 Jul 1997 by Geert Uytterhoeven */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "pata_falcon" #define DRV_VERSION "0.1.0" static int pata_falcon_swap_mask; module_param_named(data_swab, pata_falcon_swap_mask, int, 0444); MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)"); static const struct scsi_host_template pata_falcon_sht = { ATA_PIO_SHT(DRV_NAME), }; static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, unsigned char *buf, unsigned int buflen, int rw) { struct ata_device *dev = qc->dev; struct ata_port *ap = dev->link->ap; void __iomem *data_addr = ap->ioaddr.data_addr; unsigned int words = buflen >> 1; struct scsi_cmnd *cmd = qc->scsicmd; bool swap = 1; if (dev->class == ATA_DEV_ATA && cmd && !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) swap = (uintptr_t)ap->private_data & BIT(dev->devno); /* Transfer multiple of 2 bytes */ if (rw == READ) { if (swap) raw_insw_swapw(data_addr, (u16 *)buf, words); else raw_insw(data_addr, (u16 *)buf, words); } else { if (swap) raw_outsw_swapw(data_addr, (u16 *)buf, words); else raw_outsw(data_addr, (u16 *)buf, words); } /* Transfer trailing byte, if any. */ if (unlikely(buflen & 0x01)) { unsigned char pad[2] = { }; /* Point buf to the tail of buffer */ buf += buflen - 1; if (rw == READ) { if (swap) raw_insw_swapw(data_addr, (u16 *)pad, 1); else raw_insw(data_addr, (u16 *)pad, 1); *buf = pad[0]; } else { pad[0] = *buf; if (swap) raw_outsw_swapw(data_addr, (u16 *)pad, 1); else raw_outsw(data_addr, (u16 *)pad, 1); } words++; } return words << 1; } /* * Provide our own set_mode() as we don't want to change anything that has * already been configured.. */ static int pata_falcon_set_mode(struct ata_link *link, struct ata_device **unused) { struct ata_device *dev; ata_for_each_dev(dev, link, ENABLED) { /* We don't really care */ dev->pio_mode = dev->xfer_mode = XFER_PIO_0; dev->xfer_shift = ATA_SHIFT_PIO; dev->flags |= ATA_DFLAG_PIO; ata_dev_info(dev, "configured for PIO\n"); } return 0; } static struct ata_port_operations pata_falcon_ops = { .inherits = &ata_sff_port_ops, .sff_data_xfer = pata_falcon_data_xfer, .cable_detect = ata_cable_unknown, .set_mode = pata_falcon_set_mode, }; static int pata_falcon_init_one(struct platform_device *pdev) { struct resource *base_mem_res, *ctl_mem_res; struct resource *base_res, *ctl_res, *irq_res; struct ata_host *host; struct ata_port *ap; void __iomem *base, *ctl_base; int mask_shift = 0; /* Q40 & Falcon default */ int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */ dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (base_res && !devm_request_region(&pdev->dev, base_res->start, resource_size(base_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, resource_size(ctl_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!base_mem_res) return -ENODEV; if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, resource_size(base_mem_res), DRV_NAME)) { dev_err(&pdev->dev, "resources busy\n"); return -EBUSY; } ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!ctl_mem_res) return -ENODEV; /* allocate host */ host = ata_host_alloc(&pdev->dev, 1); if (!host) return -ENOMEM; ap = host->ports[0]; ap->ops = &pata_falcon_ops; ap->pio_mask = ATA_PIO4; ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; /* N.B. this assumes data_addr will be used for word-sized I/O only */ ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; if (base_res) { /* only Q40 has IO resources */ io_offset = 0x10000; reg_shift = 0; base = (void __iomem *)base_res->start; ctl_base = (void __iomem *)ctl_res->start; } else { base = (void __iomem *)base_mem_res->start; ctl_base = (void __iomem *)ctl_mem_res->start; } ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift); ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift); ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift); ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift); ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift); ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift); ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift); ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift); ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift); ap->ioaddr.altstatus_addr = ctl_base + io_offset; ap->ioaddr.ctl_addr = ctl_base + io_offset; ata_port_desc(ap, "cmd %px ctl %px data %px", base, ctl_base, ap->ioaddr.data_addr); if (pdev->id > 0) mask_shift = 2; ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift); irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (irq_res && irq_res->start > 0) { irq = irq_res->start; } else { ap->flags |= ATA_FLAG_PIO_POLLING; ata_port_desc(ap, "no IRQ, using PIO polling"); } /* activate */ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, IRQF_SHARED, &pata_falcon_sht); } static void pata_falcon_remove_one(struct platform_device *pdev) { struct ata_host *host = platform_get_drvdata(pdev); ata_host_detach(host); } static struct platform_driver pata_falcon_driver = { .probe = pata_falcon_init_one, .remove_new = pata_falcon_remove_one, .driver = { .name = "atari-falcon-ide", }, }; module_platform_driver(pata_falcon_driver); MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:atari-falcon-ide"); MODULE_VERSION(DRV_VERSION);