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Alessandro Zummo0df0d0a2006-11-14 13:43:21 -05001/*
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 "0.1.1"
27
28static void ixp4xx_set_mode(struct ata_port *ap)
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 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 }
41}
42
43static void ixp4xx_phy_reset(struct ata_port *ap)
44{
45 ap->cbl = ATA_CBL_PATA40;
46 ata_port_probe(ap);
47 ata_bus_reset(ap);
48}
49
50static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
51 unsigned int buflen, int write_data)
52{
53 unsigned int i;
54 unsigned int words = buflen >> 1;
55 u16 *buf16 = (u16 *) buf;
56 struct ata_port *ap = adev->ap;
57 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
58 struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
59
60 /* set the expansion bus in 16bit mode and restore
61 * 8 bit mode after the transaction.
62 */
63 *data->cs0_cfg &= ~(0x01);
64 udelay(100);
65
66 /* Transfer multiple of 2 bytes */
67 if (write_data) {
68 for (i = 0; i < words; i++)
69 writew(buf16[i], mmio);
70 } else {
71 for (i = 0; i < words; i++)
72 buf16[i] = readw(mmio);
73 }
74
75 /* Transfer trailing 1 byte, if any. */
76 if (unlikely(buflen & 0x01)) {
77 u16 align_buf[1] = { 0 };
78 unsigned char *trailing_buf = buf + buflen - 1;
79
80 if (write_data) {
81 memcpy(align_buf, trailing_buf, 1);
82 writew(align_buf[0], mmio);
83 } else {
84 align_buf[0] = readw(mmio);
85 memcpy(trailing_buf, align_buf, 1);
86 }
87 }
88
89 udelay(100);
90 *data->cs0_cfg |= 0x01;
91}
92
93static void ixp4xx_irq_clear(struct ata_port *ap)
94{
95}
96
97static void ixp4xx_host_stop (struct ata_host *host)
98{
99 struct ixp4xx_pata_data *data = host->dev->platform_data;
100
101 iounmap(data->cs0);
102 iounmap(data->cs1);
103}
104
105static struct scsi_host_template ixp4xx_sht = {
106 .module = THIS_MODULE,
107 .name = DRV_NAME,
108 .ioctl = ata_scsi_ioctl,
109 .queuecommand = ata_scsi_queuecmd,
110 .can_queue = ATA_DEF_QUEUE,
111 .this_id = ATA_SHT_THIS_ID,
112 .sg_tablesize = LIBATA_MAX_PRD,
113 .max_sectors = ATA_MAX_SECTORS,
114 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
115 .emulated = ATA_SHT_EMULATED,
116 .use_clustering = ATA_SHT_USE_CLUSTERING,
117 .proc_name = DRV_NAME,
118 .dma_boundary = ATA_DMA_BOUNDARY,
119 .slave_configure = ata_scsi_slave_config,
120 .bios_param = ata_std_bios_param,
121};
122
123static struct ata_port_operations ixp4xx_port_ops = {
124 .set_mode = ixp4xx_set_mode,
125 .mode_filter = ata_pci_default_filter,
126
127 .port_disable = ata_port_disable,
128 .tf_load = ata_tf_load,
129 .tf_read = ata_tf_read,
130 .check_status = ata_check_status,
131 .exec_command = ata_exec_command,
132 .dev_select = ata_std_dev_select,
133
134 .qc_prep = ata_qc_prep,
135 .qc_issue = ata_qc_issue_prot,
136 .eng_timeout = ata_eng_timeout,
137 .data_xfer = ixp4xx_mmio_data_xfer,
138
139 .irq_handler = ata_interrupt,
140 .irq_clear = ixp4xx_irq_clear,
141
142 .port_start = ata_port_start,
143 .port_stop = ata_port_stop,
144 .host_stop = ixp4xx_host_stop,
145
146 .phy_reset = ixp4xx_phy_reset,
147};
148
149static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
150 struct ixp4xx_pata_data *data)
151{
152 ioaddr->cmd_addr = (unsigned long) data->cs0;
153 ioaddr->altstatus_addr = (unsigned long) data->cs1 + 0x06;
154 ioaddr->ctl_addr = (unsigned long) data->cs1 + 0x06;
155
156 ata_std_ports(ioaddr);
157
158#ifndef __ARMEB__
159
160 /* adjust the addresses to handle the address swizzling of the
161 * ixp4xx in little endian mode.
162 */
163
164 ioaddr->data_addr ^= 0x02;
165 ioaddr->cmd_addr ^= 0x03;
166 ioaddr->altstatus_addr ^= 0x03;
167 ioaddr->ctl_addr ^= 0x03;
168 ioaddr->error_addr ^= 0x03;
169 ioaddr->feature_addr ^= 0x03;
170 ioaddr->nsect_addr ^= 0x03;
171 ioaddr->lbal_addr ^= 0x03;
172 ioaddr->lbam_addr ^= 0x03;
173 ioaddr->lbah_addr ^= 0x03;
174 ioaddr->device_addr ^= 0x03;
175 ioaddr->status_addr ^= 0x03;
176 ioaddr->command_addr ^= 0x03;
177#endif
178}
179
180static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
181{
182 int ret;
183 unsigned int irq;
184 struct resource *cs0, *cs1;
185 struct ata_probe_ent ae;
186
187 struct ixp4xx_pata_data *data = pdev->dev.platform_data;
188
189 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
191
192 if (!cs0 || !cs1)
193 return -EINVAL;
194
195 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
196
197 data->cs0 = ioremap(cs0->start, 0x1000);
198 data->cs1 = ioremap(cs1->start, 0x1000);
199
200 irq = platform_get_irq(pdev, 0);
201 if (irq)
202 set_irq_type(irq, IRQT_HIGH);
203
204 /* Setup expansion bus chip selects */
205 *data->cs0_cfg = data->cs0_bits;
206 *data->cs1_cfg = data->cs1_bits;
207
208 memset(&ae, 0, sizeof(struct ata_probe_ent));
209 INIT_LIST_HEAD(&ae.node);
210
211 ae.dev = &pdev->dev;
212 ae.port_ops = &ixp4xx_port_ops;
213 ae.sht = &ixp4xx_sht;
214 ae.n_ports = 1;
215 ae.pio_mask = 0x1f; /* PIO4 */
216 ae.irq = irq;
217 ae.irq_flags = 0;
218 ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
219 | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
220
221 /* run in polling mode if no irq has been assigned */
222 if (!irq)
223 ae.port_flags |= ATA_FLAG_PIO_POLLING;
224
225 ixp4xx_setup_port(&ae.port[0], data);
226
227 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
228
229 ret = ata_device_add(&ae);
230 if (ret == 0)
231 return -ENODEV;
232
233 return 0;
234}
235
236static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
237{
238 struct ata_host *host = platform_get_drvdata(dev);
239
240 ata_host_remove(host);
241 platform_set_drvdata(dev, NULL);
242
243 return 0;
244}
245
246static struct platform_driver ixp4xx_pata_platform_driver = {
247 .driver = {
248 .name = DRV_NAME,
249 .owner = THIS_MODULE,
250 },
251 .probe = ixp4xx_pata_probe,
252 .remove = __devexit_p(ixp4xx_pata_remove),
253};
254
255static int __init ixp4xx_pata_init(void)
256{
257 return platform_driver_register(&ixp4xx_pata_platform_driver);
258}
259
260static void __exit ixp4xx_pata_exit(void)
261{
262 platform_driver_unregister(&ixp4xx_pata_platform_driver);
263}
264
265MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
266MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
267MODULE_LICENSE("GPL");
268MODULE_VERSION(DRV_VERSION);
269
270module_init(ixp4xx_pata_init);
271module_exit(ixp4xx_pata_exit);