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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