Root/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c

1/*
2 * GSM Management code for the Openmoko Freerunner GSM Phone
3 *
4 * (C) 2007 by Openmoko Inc.
5 * Author: Harald Welte <laforge@openmoko.org>
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/console.h>
19#include <linux/errno.h>
20#include <linux/interrupt.h>
21#include <linux/delay.h>
22
23#include <mach/gpio.h>
24#include <asm/mach-types.h>
25
26#include <mach/hardware.h>
27#include <mach/cpu.h>
28
29#include <mach/gta02.h>
30#include <linux/mfd/pcf50633/gpio.h>
31#include <mach/regs-gpio.h>
32#include <mach/regs-gpioj.h>
33
34int gta_gsm_interrupts;
35EXPORT_SYMBOL(gta_gsm_interrupts);
36
37extern void s3c24xx_serial_console_set_silence(int);
38
39struct gta02pm_priv {
40    int gpio_ndl_gsm;
41    struct console *con;
42};
43
44static struct gta02pm_priv gta02_gsm;
45
46static struct console *find_s3c24xx_console(void)
47{
48    struct console *con;
49
50    acquire_console_sem();
51
52    for (con = console_drivers; con; con = con->next) {
53        if (!strcmp(con->name, "ttySAC"))
54            break;
55    }
56
57    release_console_sem();
58
59    return con;
60}
61
62static ssize_t gsm_read(struct device *dev, struct device_attribute *attr,
63            char *buf)
64{
65    if (!strcmp(attr->attr.name, "power_on")) {
66        if (pcf50633_gpio_get(gta02_pcf, PCF50633_GPIO2))
67            goto out_1;
68    } else if (!strcmp(attr->attr.name, "download")) {
69        if (!s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM))
70            goto out_1;
71    } else if (!strcmp(attr->attr.name, "flowcontrolled")) {
72        if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT)
73            goto out_1;
74    }
75
76    return strlcpy(buf, "0\n", 3);
77out_1:
78    return strlcpy(buf, "1\n", 3);
79}
80
81static void gsm_on_off(struct device *dev, int on)
82{
83    if (!on) {
84        s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPIO_INPUT);
85        s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPIO_INPUT);
86
87        pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 0);
88
89        if (gta02_gsm.con) {
90            s3c24xx_serial_console_set_silence(0);
91            console_start(gta02_gsm.con);
92
93            dev_dbg(dev, "powered down gta02 GSM, enabling "
94                    "serial console\n");
95        }
96
97        return;
98    }
99
100    if (gta02_gsm.con) {
101        dev_dbg(dev, "powering up GSM, thus "
102                "disconnecting serial console\n");
103
104        console_stop(gta02_gsm.con);
105        s3c24xx_serial_console_set_silence(1);
106    }
107
108    /* allow UART to talk to GSM side now we will power it */
109    s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
110    s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
111
112    pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 7);
113
114    msleep(100);
115
116    s3c2410_gpio_setpin(GTA02_GPIO_MODEM_ON, 1);
117    msleep(500);
118    s3c2410_gpio_setpin(GTA02_GPIO_MODEM_ON, 0);
119
120    /*
121     * workaround for calypso firmware moko10 and earlier,
122     * without this it will leave IRQ line high after
123     * booting
124     */
125    s3c2410_gpio_setpin(S3C2410_GPH1, 1);
126    s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
127    msleep(1000);
128    s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
129
130}
131
132static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
133             const char *buf, size_t count)
134{
135    unsigned long on = simple_strtoul(buf, NULL, 10);
136
137    if (!strcmp(attr->attr.name, "power_on")) {
138        gsm_on_off(dev, on);
139
140        return count;
141    }
142
143    if (!strcmp(attr->attr.name, "download")) {
144        /*
145         * the keyboard / buttons driver requests and enables
146         * the JACK_INSERT IRQ. We have to take care about
147         * not enabling and disabling the IRQ when it was
148         * already in that state or we get "unblanaced IRQ"
149         * kernel warnings and stack dumps. So we use the
150         * copy of the ndl_gsm state to figure out if we should
151         * enable or disable the jack interrupt
152         */
153        if (on) {
154            if (gta02_gsm.gpio_ndl_gsm)
155                disable_irq(gpio_to_irq(
156                           GTA02_GPIO_JACK_INSERT));
157        } else {
158            if (!gta02_gsm.gpio_ndl_gsm)
159                enable_irq(gpio_to_irq(
160                           GTA02_GPIO_JACK_INSERT));
161        }
162
163        gta02_gsm.gpio_ndl_gsm = !on;
164        s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, !on);
165
166        return count;
167    }
168
169    if (!strcmp(attr->attr.name, "flowcontrolled")) {
170        if (on) {
171            gta_gsm_interrupts = 0;
172            s3c2410_gpio_setpin(S3C2410_GPH1, 1);
173            s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
174        } else
175            s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
176    }
177
178    return count;
179}
180
181static DEVICE_ATTR(power_on, 0644, gsm_read, gsm_write);
182static DEVICE_ATTR(reset, 0644, gsm_read, gsm_write);
183static DEVICE_ATTR(download, 0644, gsm_read, gsm_write);
184static DEVICE_ATTR(flowcontrolled, 0644, gsm_read, gsm_write);
185
186#ifdef CONFIG_PM
187
188static int gta02_gsm_resume(struct platform_device *pdev);
189static int gta02_gsm_suspend(struct platform_device *pdev, pm_message_t state)
190{
191    /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
192     * don't need to do much here. */
193
194    /* If flowcontrol asserted, abort if GSM already interrupted */
195    if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) {
196        if (gta_gsm_interrupts)
197            goto busy;
198    }
199
200    /* disable DL GSM to prevent jack_insert becoming 'floating' */
201    s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
202    return 0;
203
204busy:
205    return -EBUSY;
206}
207
208static int
209gta02_gsm_suspend_late(struct platform_device *pdev, pm_message_t state)
210{
211    /* Last chance: abort if GSM already interrupted */
212    if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) {
213        if (gta_gsm_interrupts)
214            return -EBUSY;
215    }
216    return 0;
217}
218
219static int gta02_gsm_resume(struct platform_device *pdev)
220{
221    /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
222     * don't need to do much here. */
223
224    /* Make sure that the kernel console on the serial port is still
225     * disabled. FIXME: resume ordering race with serial driver! */
226    if (gta02_gsm.con && s3c2410_gpio_getpin(GTA02_GPIO_MODEM_ON))
227        console_stop(gta02_gsm.con);
228
229    s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, gta02_gsm.gpio_ndl_gsm);
230
231    return 0;
232}
233#else
234#define gta02_gsm_suspend NULL
235#define gta02_gsm_suspend_late NULL
236#define gta02_gsm_resume NULL
237#endif /* CONFIG_PM */
238
239static struct attribute *gta02_gsm_sysfs_entries[] = {
240    &dev_attr_power_on.attr,
241    &dev_attr_reset.attr,
242    &dev_attr_download.attr,
243    &dev_attr_flowcontrolled.attr,
244    NULL
245};
246
247static struct attribute_group gta02_gsm_attr_group = {
248    .name = NULL,
249    .attrs = gta02_gsm_sysfs_entries,
250};
251
252static int __init gta02_gsm_probe(struct platform_device *pdev)
253{
254    switch (S3C_SYSTEM_REV_ATAG) {
255    case GTA02v1_SYSTEM_REV:
256    case GTA02v2_SYSTEM_REV:
257    case GTA02v3_SYSTEM_REV:
258    case GTA02v4_SYSTEM_REV:
259    case GTA02v5_SYSTEM_REV:
260    case GTA02v6_SYSTEM_REV:
261        break;
262    default:
263        dev_warn(&pdev->dev, "Unknown Freerunner Revision 0x%x, "
264             "some PM features not available!!!\n",
265             system_rev);
266        break;
267    }
268
269    gta02_gsm.con = find_s3c24xx_console();
270    if (!gta02_gsm.con)
271        dev_warn(&pdev->dev,
272             "cannot find S3C24xx console driver\n");
273
274    /* note that download initially disabled, and enforce that */
275    gta02_gsm.gpio_ndl_gsm = 1;
276    s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
277
278    /* GSM is to be initially off (at boot, or if this module inserted) */
279    gsm_on_off(&pdev->dev, 0);
280
281    return sysfs_create_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
282}
283
284static int gta02_gsm_remove(struct platform_device *pdev)
285{
286    sysfs_remove_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
287
288    return 0;
289}
290
291static struct platform_driver gta02_gsm_driver = {
292    .probe = gta02_gsm_probe,
293    .remove = gta02_gsm_remove,
294    .suspend = gta02_gsm_suspend,
295    .suspend_late = gta02_gsm_suspend_late,
296    .resume = gta02_gsm_resume,
297    .driver = {
298        .name = "gta02-pm-gsm",
299    },
300};
301
302static int __devinit gta02_gsm_init(void)
303{
304    return platform_driver_register(&gta02_gsm_driver);
305}
306
307static void gta02_gsm_exit(void)
308{
309    platform_driver_unregister(&gta02_gsm_driver);
310}
311
312module_init(gta02_gsm_init);
313module_exit(gta02_gsm_exit);
314
315MODULE_LICENSE("GPL");
316MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
317MODULE_DESCRIPTION("Openmoko Freerunner GSM Power Management");
318

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