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- // 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 <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/blkdev.h>
- #include <linux/delay.h>
- #include <scsi/scsi_host.h>
- #include <scsi/scsi_cmnd.h>
- #include <linux/ata.h>
- #include <linux/libata.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/platform_device.h>
- #include <asm/setup.h>
- #include <asm/atarihw.h>
- #include <asm/atariints.h>
- #include <asm/atari_stdma.h>
- #include <asm/ide.h>
- #define DRV_NAME "pata_falcon"
- #define DRV_VERSION "0.1.0"
- static 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 = 0;
- /* 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 __init 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 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);
- 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 int __exit pata_falcon_remove_one(struct platform_device *pdev)
- {
- struct ata_host *host = platform_get_drvdata(pdev);
- ata_host_detach(host);
- return 0;
- }
- static struct platform_driver pata_falcon_driver = {
- .remove = __exit_p(pata_falcon_remove_one),
- .driver = {
- .name = "atari-falcon-ide",
- },
- };
- module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
- 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);
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