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 #include <plat/omap-pm.h>
27
28 #include "powerdomain.h"
29
omap2_gpio_dev_init(struct omap_hwmod * oh,void * unused)30 static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
31 {
32 struct platform_device *pdev;
33 struct omap_gpio_platform_data *pdata;
34 struct omap_gpio_dev_attr *dev_attr;
35 char *name = "omap_gpio";
36 int id;
37 struct powerdomain *pwrdm;
38
39 /*
40 * extract the device id from name field available in the
41 * hwmod database and use the same for constructing ids for
42 * gpio devices.
43 * CAUTION: Make sure the name in the hwmod database does
44 * not change. If changed, make corresponding change here
45 * or make use of static variable mechanism to handle this.
46 */
47 sscanf(oh->name, "gpio%d", &id);
48
49 pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
50 if (!pdata) {
51 pr_err("gpio%d: Memory allocation failed\n", id);
52 return -ENOMEM;
53 }
54
55 dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
56 pdata->bank_width = dev_attr->bank_width;
57 pdata->dbck_flag = dev_attr->dbck_flag;
58 pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
59 pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
60 pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
61 if (!pdata) {
62 pr_err("gpio%d: Memory allocation failed\n", id);
63 return -ENOMEM;
64 }
65
66 switch (oh->class->rev) {
67 case 0:
68 if (id == 1)
69 /* non-wakeup GPIO pins for OMAP2 Bank1 */
70 pdata->non_wakeup_gpios = 0xe203ffc0;
71 else if (id == 2)
72 /* non-wakeup GPIO pins for OMAP2 Bank2 */
73 pdata->non_wakeup_gpios = 0x08700040;
74 /* fall through */
75
76 case 1:
77 pdata->regs->revision = OMAP24XX_GPIO_REVISION;
78 pdata->regs->direction = OMAP24XX_GPIO_OE;
79 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
80 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
81 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
82 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
83 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
84 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
85 pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
86 pdata->regs->irqenable2 = OMAP24XX_GPIO_IRQENABLE2;
87 pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
88 pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
89 pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
90 pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
91 pdata->regs->ctrl = OMAP24XX_GPIO_CTRL;
92 pdata->regs->wkup_en = OMAP24XX_GPIO_WAKE_EN;
93 pdata->regs->leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0;
94 pdata->regs->leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1;
95 pdata->regs->risingdetect = OMAP24XX_GPIO_RISINGDETECT;
96 pdata->regs->fallingdetect = OMAP24XX_GPIO_FALLINGDETECT;
97 break;
98 case 2:
99 pdata->regs->revision = OMAP4_GPIO_REVISION;
100 pdata->regs->direction = OMAP4_GPIO_OE;
101 pdata->regs->datain = OMAP4_GPIO_DATAIN;
102 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
103 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
104 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
105 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
106 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
107 pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
108 pdata->regs->irqenable2 = OMAP4_GPIO_IRQSTATUSSET1;
109 pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
110 pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
111 pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
112 pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
113 pdata->regs->ctrl = OMAP4_GPIO_CTRL;
114 pdata->regs->wkup_en = OMAP4_GPIO_IRQWAKEN0;
115 pdata->regs->leveldetect0 = OMAP4_GPIO_LEVELDETECT0;
116 pdata->regs->leveldetect1 = OMAP4_GPIO_LEVELDETECT1;
117 pdata->regs->risingdetect = OMAP4_GPIO_RISINGDETECT;
118 pdata->regs->fallingdetect = OMAP4_GPIO_FALLINGDETECT;
119 break;
120 default:
121 WARN(1, "Invalid gpio bank_type\n");
122 kfree(pdata);
123 return -EINVAL;
124 }
125
126 pwrdm = omap_hwmod_get_pwrdm(oh);
127 pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
128
129 pdev = omap_device_build(name, id - 1, oh, pdata,
130 sizeof(*pdata), NULL, 0, false);
131 kfree(pdata);
132
133 if (IS_ERR(pdev)) {
134 WARN(1, "Can't build omap_device for %s:%s.\n",
135 name, oh->name);
136 return PTR_ERR(pdev);
137 }
138
139 return 0;
140 }
141
142 /*
143 * gpio_init needs to be done before
144 * machine_init functions access gpio APIs.
145 * Hence gpio_init is a postcore_initcall.
146 */
omap2_gpio_init(void)147 static int __init omap2_gpio_init(void)
148 {
149 return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init,
150 NULL);
151 }
152 postcore_initcall(omap2_gpio_init);
153