1// SPDX-License-Identifier: GPL-2.0
  2
  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
 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
 36#define ATA_HD_CONTROL	0x39
 37
 38static struct scsi_host_template pata_falcon_sht = {
 39	ATA_PIO_SHT(DRV_NAME),
 40};
 41
 42static 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 &&
 54	    !blk_rq_is_passthrough(cmd->request))
 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 */
100static 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
115static 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
122static int __init pata_falcon_init_one(struct platform_device *pdev)
123{
124	struct resource *res;
125	struct ata_host *host;
126	struct ata_port *ap;
127	void __iomem *base;
128
129	dev_info(&pdev->dev, "Atari Falcon PATA controller\n");
130
131	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132	if (!res)
133		return -ENODEV;
134
135	if (!devm_request_mem_region(&pdev->dev, res->start,
136				     resource_size(res), DRV_NAME)) {
137		dev_err(&pdev->dev, "resources busy\n");
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
152	base = (void __iomem *)res->start;
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
174static 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
183static struct platform_driver pata_falcon_driver = {
184	.remove = __exit_p(pata_falcon_remove_one),
185	.driver   = {
186		.name	= "atari-falcon-ide",
187	},
188};
189
190module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
191
192MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
193MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
194MODULE_LICENSE("GPL v2");
195MODULE_ALIAS("platform:atari-falcon-ide");
196MODULE_VERSION(DRV_VERSION);