[mirror_ubuntu-jammy-kernel.git] / drivers / ata / pata_falcon.c

// 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"

#define ATA_HD_CONTROL	0x39

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 && cmd->request &&
	    !blk_rq_is_passthrough(cmd->request))
		swap = 0;

	/* Transfer multiple of 2 bytes */
	if (rw == READ) {
		if (swap)
			raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
		else
			raw_insw((u16 *)data_addr, (u16 *)buf, words);
	} else {
		if (swap)
			raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
		else
			raw_outsw((u16 *)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((u16 *)data_addr, (u16 *)pad, 1);
			else
				raw_insw((u16 *)data_addr, (u16 *)pad, 1);
			*buf = pad[0];
		} else {
			pad[0] = *buf;
			if (swap)
				raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
			else
				raw_outsw((u16 *)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 *res;
	struct ata_host *host;
	struct ata_port *ap;
	void __iomem *base;

	dev_info(&pdev->dev, "Atari Falcon PATA controller\n");

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	if (!devm_request_mem_region(&pdev->dev, res->start,
				     resource_size(res), DRV_NAME)) {
		dev_err(&pdev->dev, "resources busy\n");
		return -EBUSY;
	}

	/* 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;
	ap->flags |= ATA_FLAG_PIO_POLLING;

	base = (void __iomem *)res->start;
	ap->ioaddr.data_addr		= base;
	ap->ioaddr.error_addr		= base + 1 + 1 * 4;
	ap->ioaddr.feature_addr		= base + 1 + 1 * 4;
	ap->ioaddr.nsect_addr		= base + 1 + 2 * 4;
	ap->ioaddr.lbal_addr		= base + 1 + 3 * 4;
	ap->ioaddr.lbam_addr		= base + 1 + 4 * 4;
	ap->ioaddr.lbah_addr		= base + 1 + 5 * 4;
	ap->ioaddr.device_addr		= base + 1 + 6 * 4;
	ap->ioaddr.status_addr		= base + 1 + 7 * 4;
	ap->ioaddr.command_addr		= base + 1 + 7 * 4;

	ap->ioaddr.altstatus_addr	= base + ATA_HD_CONTROL;
	ap->ioaddr.ctl_addr		= base + ATA_HD_CONTROL;

	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
		      (unsigned long)base + ATA_HD_CONTROL);

	/* activate */
	return ata_host_activate(host, 0, NULL, 0, &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);
Commit	Line	Data
7f1d5c9d BZ	1	// SPDX-License-Identifier: GPL-2.0
7f1d5c9d BZ	2
7e11aabd BZ	3	/*
	4	* Atari Falcon PATA controller driver
	5	*
	6	* Copyright (c) 2016 Samsung Electronics Co., Ltd.
	7	* http://www.samsung.com
	8	*
	9	* Based on falconide.c:
	10	*
	11	* Created 12 Jul 1997 by Geert Uytterhoeven
7e11aabd BZ	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/blkdev.h>
	18	#include <linux/delay.h>
	19	#include <scsi/scsi_host.h>
	20	#include <scsi/scsi_cmnd.h>
	21	#include <linux/ata.h>
	22	#include <linux/libata.h>
	23	#include <linux/mm.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/platform_device.h>
	26
	27	#include <asm/setup.h>
	28	#include <asm/atarihw.h>
	29	#include <asm/atariints.h>
	30	#include <asm/atari_stdma.h>
	31	#include <asm/ide.h>
	32
	33	#define DRV_NAME "pata_falcon"
	34	#define DRV_VERSION "0.1.0"
	35
7e11aabd BZ	36	#define ATA_HD_CONTROL 0x39
	37
	38	static struct scsi_host_template pata_falcon_sht = {
	39	ATA_PIO_SHT(DRV_NAME),
	40	};
	41
	42	static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
	43	unsigned char *buf,
	44	unsigned int buflen, int rw)
	45	{
	46	struct ata_device *dev = qc->dev;
	47	struct ata_port *ap = dev->link->ap;
	48	void __iomem *data_addr = ap->ioaddr.data_addr;
	49	unsigned int words = buflen >> 1;
	50	struct scsi_cmnd *cmd = qc->scsicmd;
	51	bool swap = 1;
	52
	53	if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
79f4d1d5	54	!blk_rq_is_passthrough(cmd->request))
7e11aabd BZ	55	swap = 0;
	56
	57	/* Transfer multiple of 2 bytes */
	58	if (rw == READ) {
	59	if (swap)
	60	raw_insw_swapw((u16 )data_addr, (u16 )buf, words);
	61	else
	62	raw_insw((u16 )data_addr, (u16 )buf, words);
	63	} else {
	64	if (swap)
	65	raw_outsw_swapw((u16 )data_addr, (u16 )buf, words);
	66	else
	67	raw_outsw((u16 )data_addr, (u16 )buf, words);
	68	}
	69
	70	/* Transfer trailing byte, if any. */
	71	if (unlikely(buflen & 0x01)) {
	72	unsigned char pad[2] = { };
	73
	74	/* Point buf to the tail of buffer */
	75	buf += buflen - 1;
	76
	77	if (rw == READ) {
	78	if (swap)
	79	raw_insw_swapw((u16 )data_addr, (u16 )pad, 1);
	80	else
	81	raw_insw((u16 )data_addr, (u16 )pad, 1);
	82	*buf = pad[0];
	83	} else {
	84	pad[0] = *buf;
	85	if (swap)
	86	raw_outsw_swapw((u16 )data_addr, (u16 )pad, 1);
	87	else
	88	raw_outsw((u16 )data_addr, (u16 )pad, 1);
	89	}
	90	words++;
	91	}
	92
	93	return words << 1;
	94	}
	95
	96	/*
	97	* Provide our own set_mode() as we don't want to change anything that has
	98	* already been configured..
	99	*/
	100	static int pata_falcon_set_mode(struct ata_link *link,
	101	struct ata_device **unused)
	102	{
	103	struct ata_device *dev;
	104
	105	ata_for_each_dev(dev, link, ENABLED) {
	106	/* We don't really care */
	107	dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
	108	dev->xfer_shift = ATA_SHIFT_PIO;
	109	dev->flags \|= ATA_DFLAG_PIO;
	110	ata_dev_info(dev, "configured for PIO\n");
	111	}
	112	return 0;
	113	}
	114
	115	static struct ata_port_operations pata_falcon_ops = {
	116	.inherits = &ata_sff_port_ops,
	117	.sff_data_xfer = pata_falcon_data_xfer,
	118	.cable_detect = ata_cable_unknown,
119	.set_mode = pata_falcon_set_mode,
120	};
121
5ed0794c	122	static int __init pata_falcon_init_one(struct platform_device *pdev)
7e11aabd	123	{
5ed0794c	124	struct resource *res;
7e11aabd BZ	125	struct ata_host *host;
7e11aabd BZ	126	struct ata_port *ap;
7e11aabd BZ	127	void __iomem *base;
7e11aabd BZ	128
5ed0794c	129	dev_info(&pdev->dev, "Atari Falcon PATA controller\n");
7e11aabd	130
5ed0794c MS	131	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	132	if (!res)
	133	return -ENODEV;
7e11aabd	134
5ed0794c MS	135	if (!devm_request_mem_region(&pdev->dev, res->start,
	136	resource_size(res), DRV_NAME)) {
	137	dev_err(&pdev->dev, "resources busy\n");
7e11aabd BZ	138	return -EBUSY;
	139	}
	140
	141	/* allocate host */
	142	host = ata_host_alloc(&pdev->dev, 1);
	143	if (!host)
	144	return -ENOMEM;
	145	ap = host->ports[0];
	146
	147	ap->ops = &pata_falcon_ops;
	148	ap->pio_mask = ATA_PIO4;
	149	ap->flags \|= ATA_FLAG_SLAVE_POSS \| ATA_FLAG_NO_IORDY;
	150	ap->flags \|= ATA_FLAG_PIO_POLLING;
	151
5ed0794c	152	base = (void __iomem *)res->start;
7e11aabd BZ	153	ap->ioaddr.data_addr = base;
	154	ap->ioaddr.error_addr = base + 1 + 1 * 4;
	155	ap->ioaddr.feature_addr = base + 1 + 1 * 4;
	156	ap->ioaddr.nsect_addr = base + 1 + 2 * 4;
	157	ap->ioaddr.lbal_addr = base + 1 + 3 * 4;
	158	ap->ioaddr.lbam_addr = base + 1 + 4 * 4;
	159	ap->ioaddr.lbah_addr = base + 1 + 5 * 4;
	160	ap->ioaddr.device_addr = base + 1 + 6 * 4;
	161	ap->ioaddr.status_addr = base + 1 + 7 * 4;
	162	ap->ioaddr.command_addr = base + 1 + 7 * 4;
	163
	164	ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL;
	165	ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL;
	166
	167	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
	168	(unsigned long)base + ATA_HD_CONTROL);
	169
	170	/* activate */
	171	return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
	172	}
	173
5ed0794c MS	174	static int __exit pata_falcon_remove_one(struct platform_device *pdev)
	175	{
	176	struct ata_host *host = platform_get_drvdata(pdev);
	177
	178	ata_host_detach(host);
	179
	180	return 0;
	181	}
	182
	183	static struct platform_driver pata_falcon_driver = {
	184	.remove = __exit_p(pata_falcon_remove_one),
	185	.driver = {
	186	.name = "atari-falcon-ide",
	187	},
	188	};
	189
	190	module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
7e11aabd BZ	191
	192	MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
	193	MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
7f1d5c9d	194	MODULE_LICENSE("GPL v2");
5ed0794c	195	MODULE_ALIAS("platform:atari-falcon-ide");
7e11aabd	196	MODULE_VERSION(DRV_VERSION);