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

/*
 * 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
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#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_BASE	0xfff00000
#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 pata_falcon_init_one(void)
{
	struct ata_host *host;
	struct ata_port *ap;
	struct platform_device *pdev;
	void __iomem *base;

	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
		return -ENODEV;

	pr_info(DRV_NAME ": Atari Falcon PATA controller\n");

	pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
		pr_err(DRV_NAME ": 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 *)ATA_HD_BASE;
	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);
}

module_init(pata_falcon_init_one);

MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
7e11aabd BZ	1	/*
	2	* Atari Falcon PATA controller driver
	3	*
	4	* Copyright (c) 2016 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com
	6	*
	7	* Based on falconide.c:
	8	*
	9	* Created 12 Jul 1997 by Geert Uytterhoeven
	10	*
	11	* This file is subject to the terms and conditions of the GNU General Public
	12	* License. See the file "COPYING" in the main directory of this archive
	13	* for more details.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/blkdev.h>
	20	#include <linux/delay.h>
	21	#include <scsi/scsi_host.h>
	22	#include <scsi/scsi_cmnd.h>
	23	#include <linux/ata.h>
	24	#include <linux/libata.h>
	25	#include <linux/mm.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/platform_device.h>
	28
	29	#include <asm/setup.h>
	30	#include <asm/atarihw.h>
	31	#include <asm/atariints.h>
	32	#include <asm/atari_stdma.h>
	33	#include <asm/ide.h>
	34
	35	#define DRV_NAME "pata_falcon"
	36	#define DRV_VERSION "0.1.0"
	37
	38	#define ATA_HD_BASE 0xfff00000
	39	#define ATA_HD_CONTROL 0x39
	40
	41	static struct scsi_host_template pata_falcon_sht = {
	42	ATA_PIO_SHT(DRV_NAME),
	43	};
	44
	45	static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
	46	unsigned char *buf,
	47	unsigned int buflen, int rw)
	48	{
	49	struct ata_device *dev = qc->dev;
	50	struct ata_port *ap = dev->link->ap;
	51	void __iomem *data_addr = ap->ioaddr.data_addr;
	52	unsigned int words = buflen >> 1;
	53	struct scsi_cmnd *cmd = qc->scsicmd;
	54	bool swap = 1;
	55
	56	if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
79f4d1d5	57	!blk_rq_is_passthrough(cmd->request))
7e11aabd BZ	58	swap = 0;
	59
	60	/* Transfer multiple of 2 bytes */
	61	if (rw == READ) {
	62	if (swap)
	63	raw_insw_swapw((u16 )data_addr, (u16 )buf, words);
	64	else
	65	raw_insw((u16 )data_addr, (u16 )buf, words);
	66	} else {
	67	if (swap)
	68	raw_outsw_swapw((u16 )data_addr, (u16 )buf, words);
	69	else
	70	raw_outsw((u16 )data_addr, (u16 )buf, words);
	71	}
	72
	73	/* Transfer trailing byte, if any. */
	74	if (unlikely(buflen & 0x01)) {
	75	unsigned char pad[2] = { };
	76
	77	/* Point buf to the tail of buffer */
	78	buf += buflen - 1;
	79
	80	if (rw == READ) {
	81	if (swap)
	82	raw_insw_swapw((u16 )data_addr, (u16 )pad, 1);
	83	else
	84	raw_insw((u16 )data_addr, (u16 )pad, 1);
	85	*buf = pad[0];
	86	} else {
	87	pad[0] = *buf;
	88	if (swap)
	89	raw_outsw_swapw((u16 )data_addr, (u16 )pad, 1);
	90	else
	91	raw_outsw((u16 )data_addr, (u16 )pad, 1);
	92	}
	93	words++;
	94	}
	95
	96	return words << 1;
	97	}
	98
	99	/*
	100	* Provide our own set_mode() as we don't want to change anything that has
	101	* already been configured..
	102	*/
	103	static int pata_falcon_set_mode(struct ata_link *link,
	104	struct ata_device **unused)
	105	{
	106	struct ata_device *dev;
	107
	108	ata_for_each_dev(dev, link, ENABLED) {
	109	/* We don't really care */
	110	dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
	111	dev->xfer_shift = ATA_SHIFT_PIO;
	112	dev->flags \|= ATA_DFLAG_PIO;
	113	ata_dev_info(dev, "configured for PIO\n");
	114	}
	115	return 0;
	116	}
	117
	118	static struct ata_port_operations pata_falcon_ops = {
	119	.inherits = &ata_sff_port_ops,
	120	.sff_data_xfer = pata_falcon_data_xfer,
	121	.cable_detect = ata_cable_unknown,
122	.set_mode = pata_falcon_set_mode,
123	};
124
125	static int pata_falcon_init_one(void)
126	{
127	struct ata_host *host;
128	struct ata_port *ap;
129	struct platform_device *pdev;
130	void __iomem *base;
131
132	if (!MACH_IS_ATARI \|\| !ATARIHW_PRESENT(IDE))
133	return -ENODEV;
134
135	pr_info(DRV_NAME ": Atari Falcon PATA controller\n");
136
137	pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
138	if (IS_ERR(pdev))
139	return PTR_ERR(pdev);
140
141	if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
142	pr_err(DRV_NAME ": resources busy\n");
143	return -EBUSY;
144	}
145
146	/* allocate host */
147	host = ata_host_alloc(&pdev->dev, 1);
148	if (!host)
149	return -ENOMEM;
150	ap = host->ports[0];
151
152	ap->ops = &pata_falcon_ops;
153	ap->pio_mask = ATA_PIO4;
154	ap->flags \|= ATA_FLAG_SLAVE_POSS \| ATA_FLAG_NO_IORDY;
155	ap->flags \|= ATA_FLAG_PIO_POLLING;
156
157	base = (void __iomem *)ATA_HD_BASE;
158	ap->ioaddr.data_addr = base;
159	ap->ioaddr.error_addr = base + 1 + 1 * 4;
160	ap->ioaddr.feature_addr = base + 1 + 1 * 4;
161	ap->ioaddr.nsect_addr = base + 1 + 2 * 4;
162	ap->ioaddr.lbal_addr = base + 1 + 3 * 4;
163	ap->ioaddr.lbam_addr = base + 1 + 4 * 4;
164	ap->ioaddr.lbah_addr = base + 1 + 5 * 4;
165	ap->ioaddr.device_addr = base + 1 + 6 * 4;
166	ap->ioaddr.status_addr = base + 1 + 7 * 4;
167	ap->ioaddr.command_addr = base + 1 + 7 * 4;
168
169	ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL;
170	ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL;
171
172	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
173	(unsigned long)base + ATA_HD_CONTROL);
174
175	/* activate */
176	return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
177	}
178
179	module_init(pata_falcon_init_one);
180
181	MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
182	MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
183	MODULE_LICENSE("GPL");
184	MODULE_VERSION(DRV_VERSION);