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f547170f VC |
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 | ||
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, "Cant 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 | */ | |
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); |