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
omap2_gpio_dev_init(struct omap_hwmod * oh,void * unused)27 static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
28 {
29 struct platform_device *pdev;
30 struct omap_gpio_platform_data *pdata;
31 struct omap_gpio_dev_attr *dev_attr;
32 char *name = "omap_gpio";
33 int id;
34
35 /*
36 * extract the device id from name field available in the
37 * hwmod database and use the same for constructing ids for
38 * gpio devices.
39 * CAUTION: Make sure the name in the hwmod database does
40 * not change. If changed, make corresponding change here
41 * or make use of static variable mechanism to handle this.
42 */
43 sscanf(oh->name, "gpio%d", &id);
44
45 pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
46 if (!pdata) {
47 pr_err("gpio%d: Memory allocation failed\n", id);
48 return -ENOMEM;
49 }
50
51 dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
52 pdata->bank_width = dev_attr->bank_width;
53 pdata->dbck_flag = dev_attr->dbck_flag;
54 pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
55
56 pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
57 if (!pdata) {
58 pr_err("gpio%d: Memory allocation failed\n", id);
59 return -ENOMEM;
60 }
61
62 switch (oh->class->rev) {
63 case 0:
64 case 1:
65 pdata->bank_type = METHOD_GPIO_24XX;
66 pdata->regs->revision = OMAP24XX_GPIO_REVISION;
67 pdata->regs->direction = OMAP24XX_GPIO_OE;
68 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
69 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
70 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
71 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
72 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
73 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
74 pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
75 pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
76 pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
77 pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
78 pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
79 break;
80 case 2:
81 pdata->bank_type = METHOD_GPIO_44XX;
82 pdata->regs->revision = OMAP4_GPIO_REVISION;
83 pdata->regs->direction = OMAP4_GPIO_OE;
84 pdata->regs->datain = OMAP4_GPIO_DATAIN;
85 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
86 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
87 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
88 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
89 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
90 pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
91 pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
92 pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
93 pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
94 pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
95 break;
96 default:
97 WARN(1, "Invalid gpio bank_type\n");
98 kfree(pdata);
99 return -EINVAL;
100 }
101
102 pdev = omap_device_build(name, id - 1, oh, pdata,
103 sizeof(*pdata), NULL, 0, false);
104 kfree(pdata);
105
106 if (IS_ERR(pdev)) {
107 WARN(1, "Can't build omap_device for %s:%s.\n",
108 name, oh->name);
109 return PTR_ERR(pdev);
110 }
111
112 omap_device_disable_idle_on_suspend(pdev);
113
114 gpio_bank_count++;
115 return 0;
116 }
117
118 /*
119 * gpio_init needs to be done before
120 * machine_init functions access gpio APIs.
121 * Hence gpio_init is a postcore_initcall.
122 */
omap2_gpio_init(void)123 static int __init omap2_gpio_init(void)
124 {
125 return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
126 NULL);
127 }
128 postcore_initcall(omap2_gpio_init);
129