1 /*
2 * OMAP2+ specific gpio initialization
3 *
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * Author:
7 * Charulatha V <charu@ti.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation version 2.
12 *
13 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
14 * kind, whether express or implied; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/gpio.h>
20 #include <linux/err.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
23
24 #include <plat/omap_hwmod.h>
25 #include <plat/omap_device.h>
26
27 static struct omap_device_pm_latency omap_gpio_latency[] = {
28 [0] = {
29 .deactivate_func = omap_device_idle_hwmods,
30 .activate_func = omap_device_enable_hwmods,
31 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
32 },
33 };
34
omap2_gpio_dev_init(struct omap_hwmod * oh,void * unused)35 static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
36 {
37 struct omap_device *od;
38 struct omap_gpio_platform_data *pdata;
39 struct omap_gpio_dev_attr *dev_attr;
40 char *name = "omap_gpio";
41 int id;
42
43 /*
44 * extract the device id from name field available in the
45 * hwmod database and use the same for constructing ids for
46 * gpio devices.
47 * CAUTION: Make sure the name in the hwmod database does
48 * not change. If changed, make corresponding change here
49 * or make use of static variable mechanism to handle this.
50 */
51 sscanf(oh->name, "gpio%d", &id);
52
53 pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
54 if (!pdata) {
55 pr_err("gpio%d: Memory allocation failed\n", id);
56 return -ENOMEM;
57 }
58
59 dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
60 pdata->bank_width = dev_attr->bank_width;
61 pdata->dbck_flag = dev_attr->dbck_flag;
62 pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
63
64 switch (oh->class->rev) {
65 case 0:
66 case 1:
67 pdata->bank_type = METHOD_GPIO_24XX;
68 break;
69 case 2:
70 pdata->bank_type = METHOD_GPIO_44XX;
71 break;
72 default:
73 WARN(1, "Invalid gpio bank_type\n");
74 kfree(pdata);
75 return -EINVAL;
76 }
77
78 od = omap_device_build(name, id - 1, oh, pdata,
79 sizeof(*pdata), omap_gpio_latency,
80 ARRAY_SIZE(omap_gpio_latency),
81 false);
82 kfree(pdata);
83
84 if (IS_ERR(od)) {
85 WARN(1, "Can't build omap_device for %s:%s.\n",
86 name, oh->name);
87 return PTR_ERR(od);
88 }
89
90 gpio_bank_count++;
91 return 0;
92 }
93
94 /*
95 * gpio_init needs to be done before
96 * machine_init functions access gpio APIs.
97 * Hence gpio_init is a postcore_initcall.
98 */
omap2_gpio_init(void)99 static int __init omap2_gpio_init(void)
100 {
101 return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
102 NULL);
103 }
104 postcore_initcall(omap2_gpio_init);
105