| Varadarajan, Charulatha | f547170 | 2010-12-07 16:26:57 -0800 | [diff] [blame^] | 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); |