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Varadarajan, Charulathaf5471702010-12-07 16:26:57 -08001/*
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
27static 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
35static 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
Kevin Hilmanfa87931a2011-04-20 16:31:23 -070064 pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
65 if (!pdata) {
66 pr_err("gpio%d: Memory allocation failed\n", id);
67 return -ENOMEM;
68 }
69
Varadarajan, Charulathaf5471702010-12-07 16:26:57 -080070 switch (oh->class->rev) {
71 case 0:
72 case 1:
73 pdata->bank_type = METHOD_GPIO_24XX;
Kevin Hilmanfa87931a2011-04-20 16:31:23 -070074 pdata->regs->direction = OMAP24XX_GPIO_OE;
75 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
76 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
77 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
78 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
Kevin Hilmaneef4bec2011-04-21 09:17:35 -070079 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
80 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
Varadarajan, Charulathaf5471702010-12-07 16:26:57 -080081 break;
82 case 2:
83 pdata->bank_type = METHOD_GPIO_44XX;
Kevin Hilmanfa87931a2011-04-20 16:31:23 -070084 pdata->regs->direction = OMAP4_GPIO_OE;
85 pdata->regs->datain = OMAP4_GPIO_DATAIN;
86 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
87 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
88 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
Kevin Hilmaneef4bec2011-04-21 09:17:35 -070089 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
90 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
Varadarajan, Charulathaf5471702010-12-07 16:26:57 -080091 break;
92 default:
93 WARN(1, "Invalid gpio bank_type\n");
94 kfree(pdata);
95 return -EINVAL;
96 }
97
98 od = omap_device_build(name, id - 1, oh, pdata,
99 sizeof(*pdata), omap_gpio_latency,
100 ARRAY_SIZE(omap_gpio_latency),
101 false);
102 kfree(pdata);
103
104 if (IS_ERR(od)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300105 WARN(1, "Can't build omap_device for %s:%s.\n",
Varadarajan, Charulathaf5471702010-12-07 16:26:57 -0800106 name, oh->name);
107 return PTR_ERR(od);
108 }
109
110 gpio_bank_count++;
111 return 0;
112}
113
114/*
115 * gpio_init needs to be done before
116 * machine_init functions access gpio APIs.
117 * Hence gpio_init is a postcore_initcall.
118 */
119static int __init omap2_gpio_init(void)
120{
121 return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
122 NULL);
123}
124postcore_initcall(omap2_gpio_init);