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Alessandro Zummo0df0d0a2006-11-14 13:43:21 -05001/*
2 * ixp4xx PATA/Compact Flash driver
Alessandro Zummo5d4c51f2007-05-26 19:26:55 -04003 * Copyright (C) 2006-07 Tower Technologies
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -05004 * 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
Alessandro Zummo5d4c51f2007-05-26 19:26:55 -04009 * 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.
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050012 *
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"
Alessandro Zummo5d4c51f2007-05-26 19:26:55 -040027#define DRV_VERSION "0.2"
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050028
Tejun Heo02607312007-08-06 18:36:23 +090029static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050030{
Tejun Heof58229f2007-08-06 18:36:23 +090031 struct ata_device *dev;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050032
Tejun Heo02607312007-08-06 18:36:23 +090033 ata_link_for_each_dev(dev, link) {
Tejun Heo9666f402007-05-04 21:27:47 +020034 if (ata_dev_enabled(dev)) {
Alan3ddcc592007-02-20 17:45:55 +000035 ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050036 dev->pio_mode = XFER_PIO_0;
37 dev->xfer_mode = XFER_PIO_0;
38 dev->xfer_shift = ATA_SHIFT_PIO;
39 dev->flags |= ATA_DFLAG_PIO;
40 }
41 }
Alanb229a7b2007-01-24 11:47:07 +000042 return 0;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050043}
44
Tejun Heo55dba312007-12-05 16:43:07 +090045static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
46 unsigned char *buf, unsigned int buflen, int rw)
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050047{
48 unsigned int i;
49 unsigned int words = buflen >> 1;
50 u16 *buf16 = (u16 *) buf;
Tejun Heo55dba312007-12-05 16:43:07 +090051 struct ata_port *ap = dev->link->ap;
Jeff Garzik59f99882007-05-28 07:07:20 -040052 void __iomem *mmio = ap->ioaddr.data_addr;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050053 struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
54
55 /* set the expansion bus in 16bit mode and restore
56 * 8 bit mode after the transaction.
57 */
58 *data->cs0_cfg &= ~(0x01);
59 udelay(100);
60
61 /* Transfer multiple of 2 bytes */
Tejun Heo55dba312007-12-05 16:43:07 +090062 if (rw == READ)
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050063 for (i = 0; i < words; i++)
64 buf16[i] = readw(mmio);
Tejun Heo55dba312007-12-05 16:43:07 +090065 else
66 for (i = 0; i < words; i++)
67 writew(buf16[i], mmio);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050068
69 /* Transfer trailing 1 byte, if any. */
70 if (unlikely(buflen & 0x01)) {
71 u16 align_buf[1] = { 0 };
72 unsigned char *trailing_buf = buf + buflen - 1;
73
Tejun Heo55dba312007-12-05 16:43:07 +090074 if (rw == READ) {
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050075 align_buf[0] = readw(mmio);
76 memcpy(trailing_buf, align_buf, 1);
Tejun Heo55dba312007-12-05 16:43:07 +090077 } else {
78 memcpy(align_buf, trailing_buf, 1);
79 writew(align_buf[0], mmio);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050080 }
Tejun Heo55dba312007-12-05 16:43:07 +090081 words++;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050082 }
83
84 udelay(100);
85 *data->cs0_cfg |= 0x01;
Tejun Heo55dba312007-12-05 16:43:07 +090086
87 return words << 1;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050088}
89
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050090static struct scsi_host_template ixp4xx_sht = {
Tejun Heo68d1d072008-03-25 12:22:49 +090091 ATA_PIO_SHT(DRV_NAME),
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050092};
93
94static struct ata_port_operations ixp4xx_port_ops = {
Tejun Heo029cfd62008-03-25 12:22:49 +090095 .inherits = &ata_sff_port_ops,
Tejun Heo5682ed32008-04-07 22:47:16 +090096 .sff_data_xfer = ixp4xx_mmio_data_xfer,
Alessandro Zummo5d4c51f2007-05-26 19:26:55 -040097 .cable_detect = ata_cable_40wire,
Tejun Heo029cfd62008-03-25 12:22:49 +090098 .set_mode = ixp4xx_set_mode,
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -050099};
100
Rod Whitbyaf183742008-01-06 10:05:28 +0900101static void ixp4xx_setup_port(struct ata_port *ap,
Tejun Heocbcdd872007-08-18 13:14:55 +0900102 struct ixp4xx_pata_data *data,
103 unsigned long raw_cs0, unsigned long raw_cs1)
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500104{
Rod Whitbyaf183742008-01-06 10:05:28 +0900105 struct ata_ioports *ioaddr = &ap->ioaddr;
Tejun Heocbcdd872007-08-18 13:14:55 +0900106 unsigned long raw_cmd = raw_cs0;
107 unsigned long raw_ctl = raw_cs1 + 0x06;
108
Tejun Heo0d5ff562007-02-01 15:06:36 +0900109 ioaddr->cmd_addr = data->cs0;
110 ioaddr->altstatus_addr = data->cs1 + 0x06;
111 ioaddr->ctl_addr = data->cs1 + 0x06;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500112
Tejun Heo9363c382008-04-07 22:47:16 +0900113 ata_sff_std_ports(ioaddr);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500114
115#ifndef __ARMEB__
116
117 /* adjust the addresses to handle the address swizzling of the
118 * ixp4xx in little endian mode.
119 */
120
Tejun Heo0d5ff562007-02-01 15:06:36 +0900121 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
122 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
123 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
124 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
125 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
126 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
127 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
128 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
129 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
130 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
131 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
132 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
133 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
Tejun Heocbcdd872007-08-18 13:14:55 +0900134
135 raw_cmd ^= 0x03;
136 raw_ctl ^= 0x03;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500137#endif
Tejun Heocbcdd872007-08-18 13:14:55 +0900138
139 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500140}
141
142static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
143{
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500144 unsigned int irq;
145 struct resource *cs0, *cs1;
Tejun Heo5d728822007-04-17 23:44:08 +0900146 struct ata_host *host;
147 struct ata_port *ap;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500148 struct ixp4xx_pata_data *data = pdev->dev.platform_data;
149
150 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
152
153 if (!cs0 || !cs1)
154 return -EINVAL;
155
Tejun Heo5d728822007-04-17 23:44:08 +0900156 /* allocate host */
157 host = ata_host_alloc(&pdev->dev, 1);
158 if (!host)
159 return -ENOMEM;
160
161 /* acquire resources and fill host */
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500162 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
163
Tejun Heo24dc5f32007-01-20 16:00:28 +0900164 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
165 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500166
Scott Thompson991bf522007-10-02 13:53:01 -0700167 if (!data->cs0 || !data->cs1)
168 return -ENOMEM;
169
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500170 irq = platform_get_irq(pdev, 0);
171 if (irq)
Alessandro Zummo282c6b92007-03-18 15:23:33 +0100172 set_irq_type(irq, IRQT_RISING);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500173
174 /* Setup expansion bus chip selects */
175 *data->cs0_cfg = data->cs0_bits;
176 *data->cs1_cfg = data->cs1_bits;
177
Tejun Heo5d728822007-04-17 23:44:08 +0900178 ap = host->ports[0];
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500179
Tejun Heo5d728822007-04-17 23:44:08 +0900180 ap->ops = &ixp4xx_port_ops;
181 ap->pio_mask = 0x1f; /* PIO4 */
182 ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500183
Tejun Heocbcdd872007-08-18 13:14:55 +0900184 ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500185
186 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
187
Tejun Heo5d728822007-04-17 23:44:08 +0900188 /* activate host */
Tejun Heo9363c382008-04-07 22:47:16 +0900189 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500190}
191
192static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
193{
194 struct ata_host *host = platform_get_drvdata(dev);
195
Tejun Heo24dc5f32007-01-20 16:00:28 +0900196 ata_host_detach(host);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500197
198 return 0;
199}
200
201static struct platform_driver ixp4xx_pata_platform_driver = {
202 .driver = {
203 .name = DRV_NAME,
204 .owner = THIS_MODULE,
205 },
206 .probe = ixp4xx_pata_probe,
207 .remove = __devexit_p(ixp4xx_pata_remove),
208};
209
210static int __init ixp4xx_pata_init(void)
211{
212 return platform_driver_register(&ixp4xx_pata_platform_driver);
213}
214
215static void __exit ixp4xx_pata_exit(void)
216{
217 platform_driver_unregister(&ixp4xx_pata_platform_driver);
218}
219
220MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
221MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
222MODULE_LICENSE("GPL");
223MODULE_VERSION(DRV_VERSION);
Kay Sievers458622f2008-04-18 13:41:57 -0700224MODULE_ALIAS("platform:" DRV_NAME);
Alessandro Zummo0df0d0a2006-11-14 13:43:21 -0500225
226module_init(ixp4xx_pata_init);
227module_exit(ixp4xx_pata_exit);