Root/target/linux/adm5120/files/drivers/ata/pata_rb153_cf.c

1/*
2 * A low-level PATA driver to handle a Compact Flash connected on the
3 * Mikrotik's RouterBoard 153 board.
4 *
5 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
6 *
7 * This file was based on: drivers/ata/pata_ixp4xx_cf.c
8 * Copyright (C) 2006-07 Tower Technologies
9 * Author: Alessandro Zummo <a.zummo@towertech.it>
10 *
11 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for
12 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
13 * seems not to have a license.
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License version 2 as published
17 * by the Free Software Foundation.
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/io.h>
24#include <linux/interrupt.h>
25#include <linux/irq.h>
26#include <linux/gpio.h>
27#include <linux/platform_device.h>
28
29#include <linux/libata.h>
30#include <scsi/scsi_host.h>
31
32#define DRV_NAME "pata-rb153-cf"
33#define DRV_VERSION "0.5.0"
34#define DRV_DESC "PATA driver for RouterBOARD 153 Compact Flash"
35
36#define RB153_CF_MAXPORTS 1
37#define RB153_CF_IO_DELAY 100
38
39#define RB153_CF_REG_CMD 0x0800
40#define RB153_CF_REG_CTRL 0x080E
41#define RB153_CF_REG_DATA 0x0C00
42
43struct rb153_cf_info {
44    void __iomem *iobase;
45    unsigned int gpio_line;
46    int frozen;
47    unsigned int irq;
48};
49
50static inline void rb153_pata_finish_io(struct ata_port *ap)
51{
52    struct rb153_cf_info *info = ap->host->private_data;
53
54    /* FIXME: Keep previous delay. If this is merely a fence then
55     * ata_sff_sync might be sufficient. */
56    ata_sff_dma_pause(ap);
57    ndelay(RB153_CF_IO_DELAY);
58
59    set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
60}
61
62static void rb153_pata_exec_command(struct ata_port *ap,
63                    const struct ata_taskfile *tf)
64{
65    writeb(tf->command, ap->ioaddr.command_addr);
66    rb153_pata_finish_io(ap);
67}
68
69static unsigned int rb153_pata_data_xfer(struct ata_device *adev,
70                    unsigned char *buf,
71                    unsigned int buflen,
72                    int write_data)
73{
74    void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
75    unsigned int t;
76
77    t = buflen;
78    if (write_data) {
79        for (; t > 0; t--, buf++)
80            writeb(*buf, ioaddr);
81    } else {
82        for (; t > 0; t--, buf++)
83            *buf = readb(ioaddr);
84    }
85
86    rb153_pata_finish_io(adev->link->ap);
87    return buflen;
88}
89
90static void rb153_pata_freeze(struct ata_port *ap)
91{
92    struct rb153_cf_info *info = ap->host->private_data;
93
94    info->frozen = 1;
95}
96
97static void rb153_pata_thaw(struct ata_port *ap)
98{
99    struct rb153_cf_info *info = ap->host->private_data;
100
101    info->frozen = 0;
102}
103
104static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
105{
106    struct ata_host *ah = dev_instance;
107    struct rb153_cf_info *info = ah->private_data;
108
109    if (gpio_get_value(info->gpio_line)) {
110        set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
111        if (!info->frozen)
112            ata_sff_interrupt(irq, dev_instance);
113    } else {
114        set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
115    }
116
117    return IRQ_HANDLED;
118}
119
120static struct ata_port_operations rb153_pata_port_ops = {
121    .inherits = &ata_sff_port_ops,
122    .sff_exec_command = rb153_pata_exec_command,
123    .sff_data_xfer = rb153_pata_data_xfer,
124    .freeze = rb153_pata_freeze,
125    .thaw = rb153_pata_thaw,
126};
127
128static struct scsi_host_template rb153_pata_sht = {
129    ATA_PIO_SHT(DRV_NAME),
130};
131
132static void rb153_pata_setup_port(struct ata_host *ah)
133{
134    struct rb153_cf_info *info = ah->private_data;
135    struct ata_port *ap;
136
137    ap = ah->ports[0];
138
139    ap->ops = &rb153_pata_port_ops;
140    ap->pio_mask = 0x1f; /* PIO4 */
141    ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
142
143    ap->ioaddr.cmd_addr = info->iobase + RB153_CF_REG_CMD;
144    ap->ioaddr.ctl_addr = info->iobase + RB153_CF_REG_CTRL;
145    ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
146
147    ata_sff_std_ports(&ap->ioaddr);
148
149    ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA;
150}
151
152static __devinit int rb153_pata_driver_probe(struct platform_device *pdev)
153{
154    unsigned int irq;
155    int gpio;
156    struct resource *res;
157    struct ata_host *ah;
158    struct rb153_cf_info *info;
159    int ret;
160
161    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
162    if (!res) {
163        dev_err(&pdev->dev, "no IOMEM resource found\n");
164        return -EINVAL;
165    }
166
167    irq = platform_get_irq(pdev, 0);
168    if (irq <= 0) {
169        dev_err(&pdev->dev, "no IRQ resource found\n");
170        return -ENOENT;
171    }
172
173    gpio = irq_to_gpio(irq);
174    if (gpio < 0) {
175        dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
176        return -ENOENT;
177    }
178
179    ret = gpio_request(gpio, DRV_NAME);
180    if (ret) {
181        dev_err(&pdev->dev, "GPIO request failed\n");
182        return ret;
183    }
184
185    ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
186    if (!ah)
187        return -ENOMEM;
188
189    platform_set_drvdata(pdev, ah);
190
191    info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
192    if (!info)
193        return -ENOMEM;
194
195    ah->private_data = info;
196    info->gpio_line = gpio;
197    info->irq = irq;
198
199    info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
200                res->end - res->start + 1);
201    if (!info->iobase)
202        return -ENOMEM;
203
204    ret = gpio_direction_input(gpio);
205    if (ret) {
206        dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
207                ret);
208        goto err_free_gpio;
209    }
210
211    rb153_pata_setup_port(ah);
212
213    ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
214                IRQF_TRIGGER_LOW, &rb153_pata_sht);
215    if (ret)
216        goto err_free_gpio;
217
218    return 0;
219
220err_free_gpio:
221    gpio_free(gpio);
222
223    return ret;
224}
225
226static __devexit int rb153_pata_driver_remove(struct platform_device *pdev)
227{
228    struct ata_host *ah = platform_get_drvdata(pdev);
229    struct rb153_cf_info *info = ah->private_data;
230
231    ata_host_detach(ah);
232    gpio_free(info->gpio_line);
233
234    return 0;
235}
236
237static struct platform_driver rb153_pata_platform_driver = {
238    .probe = rb153_pata_driver_probe,
239    .remove = __devexit_p(rb153_pata_driver_remove),
240    .driver = {
241        .name = DRV_NAME,
242        .owner = THIS_MODULE,
243    },
244};
245
246/* ------------------------------------------------------------------------ */
247
248#define DRV_INFO DRV_DESC " version " DRV_VERSION
249
250static int __init rb153_pata_module_init(void)
251{
252    printk(KERN_INFO DRV_INFO "\n");
253
254    return platform_driver_register(&rb153_pata_platform_driver);
255}
256
257static void __exit rb153_pata_module_exit(void)
258{
259    platform_driver_unregister(&rb153_pata_platform_driver);
260}
261
262MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
263MODULE_DESCRIPTION(DRV_DESC);
264MODULE_VERSION(DRV_VERSION);
265MODULE_LICENSE("GPL v2");
266
267module_init(rb153_pata_module_init);
268module_exit(rb153_pata_module_exit);
269

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