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 #include <linux/of.h>
24 #include <linux/platform_data/gpio-omap.h>
25
26 #include "soc.h"
27 #include "omap_hwmod.h"
28 #include "omap_device.h"
29 #include "omap-pm.h"
30
31 #include "powerdomain.h"
32
omap2_gpio_dev_init(struct omap_hwmod * oh,void * unused)33 static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
34 {
35 struct platform_device *pdev;
36 struct omap_gpio_platform_data *pdata;
37 struct omap_gpio_dev_attr *dev_attr;
38 char *name = "omap_gpio";
39 int id;
40 struct powerdomain *pwrdm;
41
42 /*
43 * extract the device id from name field available in the
44 * hwmod database and use the same for constructing ids for
45 * gpio devices.
46 * CAUTION: Make sure the name in the hwmod database does
47 * not change. If changed, make corresponding change here
48 * or make use of static variable mechanism to handle this.
49 */
50 sscanf(oh->name, "gpio%d", &id);
51
52 pdata = kzalloc(sizeof(struct omap_gpio_platform_data), GFP_KERNEL);
53 if (!pdata) {
54 pr_err("gpio%d: Memory allocation failed\n", id);
55 return -ENOMEM;
56 }
57
58 dev_attr = (struct omap_gpio_dev_attr *)oh->dev_attr;
59 pdata->bank_width = dev_attr->bank_width;
60 pdata->dbck_flag = dev_attr->dbck_flag;
61 pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
62 pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
63 if (!pdata->regs) {
64 pr_err("gpio%d: Memory allocation failed\n", id);
65 kfree(pdata);
66 return -ENOMEM;
67 }
68
69 switch (oh->class->rev) {
70 case 0:
71 if (id == 1)
72 /* non-wakeup GPIO pins for OMAP2 Bank1 */
73 pdata->non_wakeup_gpios = 0xe203ffc0;
74 else if (id == 2)
75 /* non-wakeup GPIO pins for OMAP2 Bank2 */
76 pdata->non_wakeup_gpios = 0x08700040;
77 /* fall through */
78
79 case 1:
80 pdata->regs->revision = OMAP24XX_GPIO_REVISION;
81 pdata->regs->direction = OMAP24XX_GPIO_OE;
82 pdata->regs->datain = OMAP24XX_GPIO_DATAIN;
83 pdata->regs->dataout = OMAP24XX_GPIO_DATAOUT;
84 pdata->regs->set_dataout = OMAP24XX_GPIO_SETDATAOUT;
85 pdata->regs->clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT;
86 pdata->regs->irqstatus = OMAP24XX_GPIO_IRQSTATUS1;
87 pdata->regs->irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2;
88 pdata->regs->irqenable = OMAP24XX_GPIO_IRQENABLE1;
89 pdata->regs->irqenable2 = OMAP24XX_GPIO_IRQENABLE2;
90 pdata->regs->set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1;
91 pdata->regs->clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1;
92 pdata->regs->debounce = OMAP24XX_GPIO_DEBOUNCE_VAL;
93 pdata->regs->debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN;
94 pdata->regs->ctrl = OMAP24XX_GPIO_CTRL;
95 pdata->regs->wkup_en = OMAP24XX_GPIO_WAKE_EN;
96 pdata->regs->leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0;
97 pdata->regs->leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1;
98 pdata->regs->risingdetect = OMAP24XX_GPIO_RISINGDETECT;
99 pdata->regs->fallingdetect = OMAP24XX_GPIO_FALLINGDETECT;
100 break;
101 case 2:
102 pdata->regs->revision = OMAP4_GPIO_REVISION;
103 pdata->regs->direction = OMAP4_GPIO_OE;
104 pdata->regs->datain = OMAP4_GPIO_DATAIN;
105 pdata->regs->dataout = OMAP4_GPIO_DATAOUT;
106 pdata->regs->set_dataout = OMAP4_GPIO_SETDATAOUT;
107 pdata->regs->clr_dataout = OMAP4_GPIO_CLEARDATAOUT;
108 pdata->regs->irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0;
109 pdata->regs->irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1;
110 pdata->regs->irqstatus = OMAP4_GPIO_IRQSTATUS0;
111 pdata->regs->irqstatus2 = OMAP4_GPIO_IRQSTATUS1;
112 pdata->regs->irqenable = OMAP4_GPIO_IRQSTATUSSET0;
113 pdata->regs->irqenable2 = OMAP4_GPIO_IRQSTATUSSET1;
114 pdata->regs->set_irqenable = OMAP4_GPIO_IRQSTATUSSET0;
115 pdata->regs->clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0;
116 pdata->regs->debounce = OMAP4_GPIO_DEBOUNCINGTIME;
117 pdata->regs->debounce_en = OMAP4_GPIO_DEBOUNCENABLE;
118 pdata->regs->ctrl = OMAP4_GPIO_CTRL;
119 pdata->regs->wkup_en = OMAP4_GPIO_IRQWAKEN0;
120 pdata->regs->leveldetect0 = OMAP4_GPIO_LEVELDETECT0;
121 pdata->regs->leveldetect1 = OMAP4_GPIO_LEVELDETECT1;
122 pdata->regs->risingdetect = OMAP4_GPIO_RISINGDETECT;
123 pdata->regs->fallingdetect = OMAP4_GPIO_FALLINGDETECT;
124 break;
125 default:
126 WARN(1, "Invalid gpio bank_type\n");
127 kfree(pdata->regs);
128 kfree(pdata);
129 return -EINVAL;
130 }
131
132 pwrdm = omap_hwmod_get_pwrdm(oh);
133 pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
134
135 pdev = omap_device_build(name, id - 1, oh, pdata, sizeof(*pdata));
136 kfree(pdata);
137
138 if (IS_ERR(pdev)) {
139 WARN(1, "Can't build omap_device for %s:%s.\n",
140 name, oh->name);
141 return PTR_ERR(pdev);
142 }
143
144 return 0;
145 }
146
147 /*
148 * gpio_init needs to be done before
149 * machine_init functions access gpio APIs.
150 * Hence gpio_init is a omap_postcore_initcall.
151 */
omap2_gpio_init(void)152 static int __init omap2_gpio_init(void)
153 {
154 /* If dtb is there, the devices will be created dynamically */
155 if (of_have_populated_dt())
156 return -ENODEV;
157
158 return omap_hwmod_for_each_by_class("gpio", omap2_gpio_dev_init, NULL);
159 }
160 omap_postcore_initcall(omap2_gpio_init);
161