1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* ixp4xx PATA/Compact Flash driver
* Copyright (C) 2006-07 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* An ATA driver to handle a Compact Flash connected
* to the ixp4xx expansion bus in TrueIDE mode. The CF
* must have it chip selects connected to two CS lines
* on the ixp4xx. In the irq is not available, you might
* want to modify both this driver and libata to run in
* polling mode.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/libata.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <scsi/scsi_host.h>
#define DRV_NAME "pata_ixp4xx_cf"
#define DRV_VERSION "0.2"
static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
{
struct ata_device *dev;
ata_for_each_dev(dev, link, ENABLED) {
ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
dev->pio_mode = XFER_PIO_0;
dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
}
return 0;
}
static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
unsigned char *buf, unsigned int buflen, int rw)
{
unsigned int i;
unsigned int words = buflen >> 1;
u16 *buf16 = (u16 *) buf;
struct ata_port *ap = dev->link->ap;
void __iomem *mmio = ap->ioaddr.data_addr;
struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
/* set the expansion bus in 16bit mode and restore
* 8 bit mode after the transaction.
*/
*data->cs0_cfg &= ~(0x01);
udelay(100);
/* Transfer multiple of 2 bytes */
if (rw == READ)
for (i = 0; i < words; i++)
buf16[i] = readw(mmio);
else
for (i = 0; i < words; i++)
writew(buf16[i], mmio);
/* Transfer trailing 1 byte, if any. */
if (unlikely(buflen & 0x01)) {
u16 align_buf[1] = { 0 };
unsigned char *trailing_buf = buf + buflen - 1;
if (rw == READ) {
align_buf[0] = readw(mmio);
memcpy(trailing_buf, align_buf, 1);
} else {
memcpy(align_buf, trailing_buf, 1);
writew(align_buf[0], mmio);
}
words++;
}
udelay(100);
*data->cs0_cfg |= 0x01;
return words << 1;
}
static struct scsi_host_template ixp4xx_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations ixp4xx_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = ixp4xx_mmio_data_xfer,
.cable_detect = ata_cable_40wire,
.set_mode = ixp4xx_set_mode,
};
static void ixp4xx_setup_port(struct ata_port *ap,
struct ixp4xx_pata_data *data,
unsigned long raw_cs0, unsigned long raw_cs1)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
unsigned long raw_cmd = raw_cs0;
unsigned long raw_ctl = raw_cs1 + 0x06;
ioaddr->cmd_addr = data->cs0;
ioaddr->altstatus_addr = data->cs1 + 0x06;
ioaddr->ctl_addr = data->cs1 + 0x06;
ata_sff_std_ports(ioaddr);
#ifndef __ARMEB__
/* adjust the addresses to handle the address swizzling of the
* ixp4xx in little endian mode.
*/
*(unsigned long *)&ioaddr->data_addr ^= 0x02;
*(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
*(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
*(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
*(unsigned long *)&ioaddr->error_addr ^= 0x03;
*(unsigned long *)&ioaddr->feature_addr ^= 0x03;
*(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
*(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
*(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
*(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
*(unsigned long *)&ioaddr->device_addr ^= 0x03;
*(unsigned long *)&ioaddr->status_addr ^= 0x03;
*(unsigned long *)&ioaddr->command_addr ^= 0x03;
raw_cmd ^= 0x03;
raw_ctl ^= 0x03;
#endif
ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
}
static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
{
unsigned int irq;
struct resource *cs0, *cs1;
struct ata_host *host;
struct ata_port *ap;
struct ixp4xx_pata_data *data = pdev->dev.platform_data;
cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!cs0 || !cs1)
return -EINVAL;
/* allocate host */
host = ata_host_alloc(&pdev->dev, 1);
if (!host)
return -ENOMEM;
/* acquire resources and fill host */
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
if (!data->cs0 || !data->cs1)
return -ENOMEM;
irq = platform_get_irq(pdev, 0);
if (irq)
set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
/* Setup expansion bus chip selects */
*data->cs0_cfg = data->cs0_bits;
*data->cs1_cfg = data->cs1_bits;
ap = host->ports[0];
ap->ops = &ixp4xx_port_ops;
ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
/* activate host */
return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
}
static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
{
struct ata_host *host = platform_get_drvdata(dev);
ata_host_detach(host);
return 0;
}
static struct platform_driver ixp4xx_pata_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = ixp4xx_pata_probe,
.remove = __devexit_p(ixp4xx_pata_remove),
};
static int __init ixp4xx_pata_init(void)
{
return platform_driver_register(&ixp4xx_pata_platform_driver);
}
static void __exit ixp4xx_pata_exit(void)
{
platform_driver_unregister(&ixp4xx_pata_platform_driver);
}
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);
module_init(ixp4xx_pata_init);
module_exit(ixp4xx_pata_exit);
|
