1/*
2 * ixp4xx PATA/Compact Flash driver
3 * Copyright (C) 2006-07 Tower Technologies
4 * Author: Alessandro Zummo <a.zummo@towertech.it>
5 *
6 * An ATA driver to handle a Compact Flash connected
7 * to the ixp4xx expansion bus in TrueIDE mode. The CF
8 * must have it chip selects connected to two CS lines
9 * on the ixp4xx. In the irq is not available, you might
10 * want to modify both this driver and libata to run in
11 * polling mode.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/libata.h>
22#include <linux/irq.h>
23#include <linux/platform_device.h>
24#include <scsi/scsi_host.h>
25
26#define DRV_NAME	"pata_ixp4xx_cf"
27#define DRV_VERSION	"0.2"
28
29static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
30{
31	struct ata_device *dev;
32
33	ata_for_each_dev(dev, link, ENABLED) {
34		ata_dev_info(dev, "configured for PIO0\n");
35		dev->pio_mode = XFER_PIO_0;
36		dev->xfer_mode = XFER_PIO_0;
37		dev->xfer_shift = ATA_SHIFT_PIO;
38		dev->flags |= ATA_DFLAG_PIO;
39	}
40	return 0;
41}
42
43static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
44				unsigned char *buf, unsigned int buflen, int rw)
45{
46	unsigned int i;
47	unsigned int words = buflen >> 1;
48	u16 *buf16 = (u16 *) buf;
49	struct ata_port *ap = dev->link->ap;
50	void __iomem *mmio = ap->ioaddr.data_addr;
51	struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
52
53	/* set the expansion bus in 16bit mode and restore
54	 * 8 bit mode after the transaction.
55	 */
56	*data->cs0_cfg &= ~(0x01);
57	udelay(100);
58
59	/* Transfer multiple of 2 bytes */
60	if (rw == READ)
61		for (i = 0; i < words; i++)
62			buf16[i] = readw(mmio);
63	else
64		for (i = 0; i < words; i++)
65			writew(buf16[i], mmio);
66
67	/* Transfer trailing 1 byte, if any. */
68	if (unlikely(buflen & 0x01)) {
69		u16 align_buf[1] = { 0 };
70		unsigned char *trailing_buf = buf + buflen - 1;
71
72		if (rw == READ) {
73			align_buf[0] = readw(mmio);
74			memcpy(trailing_buf, align_buf, 1);
75		} else {
76			memcpy(align_buf, trailing_buf, 1);
77			writew(align_buf[0], mmio);
78		}
79		words++;
80	}
81
82	udelay(100);
83	*data->cs0_cfg |= 0x01;
84
85	return words << 1;
86}
87
88static struct scsi_host_template ixp4xx_sht = {
89	ATA_PIO_SHT(DRV_NAME),
90};
91
92static struct ata_port_operations ixp4xx_port_ops = {
93	.inherits		= &ata_sff_port_ops,
94	.sff_data_xfer		= ixp4xx_mmio_data_xfer,
95	.cable_detect		= ata_cable_40wire,
96	.set_mode		= ixp4xx_set_mode,
97};
98
99static void ixp4xx_setup_port(struct ata_port *ap,
100			      struct ixp4xx_pata_data *data,
101			      unsigned long raw_cs0, unsigned long raw_cs1)
102{
103	struct ata_ioports *ioaddr = &ap->ioaddr;
104	unsigned long raw_cmd = raw_cs0;
105	unsigned long raw_ctl = raw_cs1 + 0x06;
106
107	ioaddr->cmd_addr	= data->cs0;
108	ioaddr->altstatus_addr	= data->cs1 + 0x06;
109	ioaddr->ctl_addr	= data->cs1 + 0x06;
110
111	ata_sff_std_ports(ioaddr);
112
113#ifndef __ARMEB__
114
115	/* adjust the addresses to handle the address swizzling of the
116	 * ixp4xx in little endian mode.
117	 */
118
119	*(unsigned long *)&ioaddr->data_addr		^= 0x02;
120	*(unsigned long *)&ioaddr->cmd_addr		^= 0x03;
121	*(unsigned long *)&ioaddr->altstatus_addr	^= 0x03;
122	*(unsigned long *)&ioaddr->ctl_addr		^= 0x03;
123	*(unsigned long *)&ioaddr->error_addr		^= 0x03;
124	*(unsigned long *)&ioaddr->feature_addr		^= 0x03;
125	*(unsigned long *)&ioaddr->nsect_addr		^= 0x03;
126	*(unsigned long *)&ioaddr->lbal_addr		^= 0x03;
127	*(unsigned long *)&ioaddr->lbam_addr		^= 0x03;
128	*(unsigned long *)&ioaddr->lbah_addr		^= 0x03;
129	*(unsigned long *)&ioaddr->device_addr		^= 0x03;
130	*(unsigned long *)&ioaddr->status_addr		^= 0x03;
131	*(unsigned long *)&ioaddr->command_addr		^= 0x03;
132
133	raw_cmd ^= 0x03;
134	raw_ctl ^= 0x03;
135#endif
136
137	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
138}
139
140static int ixp4xx_pata_probe(struct platform_device *pdev)
141{
142	unsigned int irq;
143	struct resource *cs0, *cs1;
144	struct ata_host *host;
145	struct ata_port *ap;
146	struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
147	int ret;
148
149	cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150	cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
151
152	if (!cs0 || !cs1)
153		return -EINVAL;
154
155	/* allocate host */
156	host = ata_host_alloc(&pdev->dev, 1);
157	if (!host)
158		return -ENOMEM;
159
160	/* acquire resources and fill host */
161	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
162	if (ret)
163		return ret;
164
165	data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
166	data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
167
168	if (!data->cs0 || !data->cs1)
169		return -ENOMEM;
170
171	irq = platform_get_irq(pdev, 0);
172	if (irq)
173		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
174
175	/* Setup expansion bus chip selects */
176	*data->cs0_cfg = data->cs0_bits;
177	*data->cs1_cfg = data->cs1_bits;
178
179	ap = host->ports[0];
180
181	ap->ops	= &ixp4xx_port_ops;
182	ap->pio_mask = ATA_PIO4;
183	ap->flags |= ATA_FLAG_NO_ATAPI;
184
185	ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
186
187	ata_print_version_once(&pdev->dev, DRV_VERSION);
188
189	/* activate host */
190	return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
191}
192
193static struct platform_driver ixp4xx_pata_platform_driver = {
194	.driver	 = {
195		.name   = DRV_NAME,
196	},
197	.probe		= ixp4xx_pata_probe,
198	.remove		= ata_platform_remove_one,
199};
200
201module_platform_driver(ixp4xx_pata_platform_driver);
202
203MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
204MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
205MODULE_LICENSE("GPL");
206MODULE_VERSION(DRV_VERSION);
207MODULE_ALIAS("platform:" DRV_NAME);
208