1/*
2 * ixp4xx PATA/Compact Flash driver
3 * Copyright (c) 2006 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. The interrupt line is optional, if not
10 * specified the driver will run in polling mode.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/libata.h>
21#include <linux/irq.h>
22#include <linux/platform_device.h>
23#include <scsi/scsi_host.h>
24
25#define DRV_NAME	"pata_ixp4xx_cf"
26#define DRV_VERSION	"0.1.3"
27
28static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device **error)
29{
30	int i;
31
32	for (i = 0; i < ATA_MAX_DEVICES; i++) {
33		struct ata_device *dev = &ap->device[i];
34		if (ata_dev_enabled(dev)) {
35			ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
36			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	}
42	return 0;
43}
44
45static void ixp4xx_phy_reset(struct ata_port *ap)
46{
47	ap->cbl = ATA_CBL_PATA40;
48	ata_port_probe(ap);
49	ata_bus_reset(ap);
50}
51
52static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
53				unsigned int buflen, int write_data)
54{
55	unsigned int i;
56	unsigned int words = buflen >> 1;
57	u16 *buf16 = (u16 *) buf;
58	struct ata_port *ap = adev->ap;
59	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
60	struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
61
62	/* set the expansion bus in 16bit mode and restore
63	 * 8 bit mode after the transaction.
64	 */
65	*data->cs0_cfg &= ~(0x01);
66	udelay(100);
67
68	/* Transfer multiple of 2 bytes */
69	if (write_data) {
70		for (i = 0; i < words; i++)
71			writew(buf16[i], mmio);
72	} else {
73		for (i = 0; i < words; i++)
74			buf16[i] = readw(mmio);
75	}
76
77	/* Transfer trailing 1 byte, if any. */
78	if (unlikely(buflen & 0x01)) {
79		u16 align_buf[1] = { 0 };
80		unsigned char *trailing_buf = buf + buflen - 1;
81
82		if (write_data) {
83			memcpy(align_buf, trailing_buf, 1);
84			writew(align_buf[0], mmio);
85		} else {
86			align_buf[0] = readw(mmio);
87			memcpy(trailing_buf, align_buf, 1);
88		}
89	}
90
91	udelay(100);
92	*data->cs0_cfg |= 0x01;
93}
94
95static void ixp4xx_irq_clear(struct ata_port *ap)
96{
97}
98
99static struct scsi_host_template ixp4xx_sht = {
100	.module			= THIS_MODULE,
101	.name			= DRV_NAME,
102	.ioctl			= ata_scsi_ioctl,
103	.queuecommand		= ata_scsi_queuecmd,
104	.can_queue		= ATA_DEF_QUEUE,
105	.this_id		= ATA_SHT_THIS_ID,
106	.sg_tablesize		= LIBATA_MAX_PRD,
107	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
108	.emulated		= ATA_SHT_EMULATED,
109	.use_clustering		= ATA_SHT_USE_CLUSTERING,
110	.proc_name		= DRV_NAME,
111	.dma_boundary		= ATA_DMA_BOUNDARY,
112	.slave_configure	= ata_scsi_slave_config,
113	.slave_destroy		= ata_scsi_slave_destroy,
114	.bios_param		= ata_std_bios_param,
115};
116
117static struct ata_port_operations ixp4xx_port_ops = {
118	.set_mode	= ixp4xx_set_mode,
119	.mode_filter	= ata_pci_default_filter,
120
121	.port_disable	= ata_port_disable,
122	.tf_load	= ata_tf_load,
123	.tf_read	= ata_tf_read,
124	.check_status 	= ata_check_status,
125	.exec_command	= ata_exec_command,
126	.dev_select 	= ata_std_dev_select,
127
128	.qc_prep 	= ata_qc_prep,
129	.qc_issue	= ata_qc_issue_prot,
130	.eng_timeout	= ata_eng_timeout,
131	.data_xfer	= ixp4xx_mmio_data_xfer,
132	.cable_detect	= ata_cable_40wire,
133
134	.irq_clear	= ixp4xx_irq_clear,
135	.irq_on		= ata_irq_on,
136	.irq_ack	= ata_irq_ack,
137
138	.port_start	= ata_port_start,
139
140	.phy_reset	= ixp4xx_phy_reset,
141};
142
143static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
144				struct ixp4xx_pata_data *data)
145{
146	ioaddr->cmd_addr	= data->cs0;
147	ioaddr->altstatus_addr	= data->cs1 + 0x06;
148	ioaddr->ctl_addr	= data->cs1 + 0x06;
149
150	ata_std_ports(ioaddr);
151
152#ifndef __ARMEB__
153
154	/* adjust the addresses to handle the address swizzling of the
155	 * ixp4xx in little endian mode.
156	 */
157
158	*(unsigned long *)&ioaddr->data_addr		^= 0x02;
159	*(unsigned long *)&ioaddr->cmd_addr		^= 0x03;
160	*(unsigned long *)&ioaddr->altstatus_addr	^= 0x03;
161	*(unsigned long *)&ioaddr->ctl_addr		^= 0x03;
162	*(unsigned long *)&ioaddr->error_addr		^= 0x03;
163	*(unsigned long *)&ioaddr->feature_addr		^= 0x03;
164	*(unsigned long *)&ioaddr->nsect_addr		^= 0x03;
165	*(unsigned long *)&ioaddr->lbal_addr		^= 0x03;
166	*(unsigned long *)&ioaddr->lbam_addr		^= 0x03;
167	*(unsigned long *)&ioaddr->lbah_addr		^= 0x03;
168	*(unsigned long *)&ioaddr->device_addr		^= 0x03;
169	*(unsigned long *)&ioaddr->status_addr		^= 0x03;
170	*(unsigned long *)&ioaddr->command_addr		^= 0x03;
171#endif
172}
173
174static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
175{
176	unsigned int irq;
177	struct resource *cs0, *cs1;
178	struct ata_host *host;
179	struct ata_port *ap;
180	struct ixp4xx_pata_data *data = pdev->dev.platform_data;
181	int rc;
182
183	cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184	cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
185
186	if (!cs0 || !cs1)
187		return -EINVAL;
188
189	/* allocate host */
190	host = ata_host_alloc(&pdev->dev, 1);
191	if (!host)
192		return -ENOMEM;
193
194	/* acquire resources and fill host */
195	pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
196
197	data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
198	data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
199
200	irq = platform_get_irq(pdev, 0);
201	if (irq)
202		set_irq_type(irq, IRQT_RISING);
203
204	/* Setup expansion bus chip selects */
205	*data->cs0_cfg = data->cs0_bits;
206	*data->cs1_cfg = data->cs1_bits;
207
208	ap = host->ports[0];
209
210	ap->ops	= &ixp4xx_port_ops;
211	ap->pio_mask = 0x1f; /* PIO4 */
212	ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
213
214	/* run in polling mode if no irq has been assigned */
215	if (!irq)
216		ap->flags |= ATA_FLAG_PIO_POLLING;
217
218	ixp4xx_setup_port(&ap->ioaddr, data);
219
220	dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
221
222	/* activate host */
223	return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
224}
225
226static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
227{
228	struct ata_host *host = platform_get_drvdata(dev);
229
230	ata_host_detach(host);
231
232	return 0;
233}
234
235static struct platform_driver ixp4xx_pata_platform_driver = {
236	.driver	 = {
237		.name   = DRV_NAME,
238		.owner  = THIS_MODULE,
239	},
240	.probe		= ixp4xx_pata_probe,
241	.remove		= __devexit_p(ixp4xx_pata_remove),
242};
243
244static int __init ixp4xx_pata_init(void)
245{
246	return platform_driver_register(&ixp4xx_pata_platform_driver);
247}
248
249static void __exit ixp4xx_pata_exit(void)
250{
251	platform_driver_unregister(&ixp4xx_pata_platform_driver);
252}
253
254MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
255MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
256MODULE_LICENSE("GPL");
257MODULE_VERSION(DRV_VERSION);
258
259module_init(ixp4xx_pata_init);
260module_exit(ixp4xx_pata_exit);
261