2 * GPIO driver for TI DaVinci DA8xx SOCs.
4 * (C) Copyright 2011 Guralp Systems Ltd.
5 * Laurence Withers <lwithers@guralp.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <asm/arch/hardware.h>
27 #include <asm/arch/davinci_misc.h>
29 static struct gpio_registry {
31 char name[GPIO_NAME_SIZE];
32 } gpio_registry[MAX_NUM_GPIOS];
34 #define pinmux(x) (&davinci_syscfg_regs->pinmux[x])
36 static const struct pinmux_config gpio_pinmux[] = {
37 { pinmux(1), 8, 7 }, /* GP0[0] */
53 { pinmux(4), 8, 7 }, /* GP1[0] */
69 { pinmux(6), 8, 7 }, /* GP2[0] */
85 { pinmux(8), 8, 7 }, /* GP3[0] */
101 { pinmux(10), 8, 7 }, /* GP4[0] */
102 { pinmux(10), 8, 6 },
103 { pinmux(10), 8, 5 },
104 { pinmux(10), 8, 4 },
105 { pinmux(10), 8, 3 },
106 { pinmux(10), 8, 2 },
107 { pinmux(10), 8, 1 },
108 { pinmux(10), 8, 0 },
117 { pinmux(12), 8, 7 }, /* GP5[0] */
118 { pinmux(12), 8, 6 },
119 { pinmux(12), 8, 5 },
120 { pinmux(12), 8, 4 },
121 { pinmux(12), 8, 3 },
122 { pinmux(12), 8, 2 },
123 { pinmux(12), 8, 1 },
124 { pinmux(12), 8, 0 },
125 { pinmux(11), 8, 7 },
126 { pinmux(11), 8, 6 },
127 { pinmux(11), 8, 5 },
128 { pinmux(11), 8, 4 },
129 { pinmux(11), 8, 3 },
130 { pinmux(11), 8, 2 },
131 { pinmux(11), 8, 1 },
132 { pinmux(11), 8, 0 },
133 { pinmux(19), 8, 6 }, /* GP6[0] */
134 { pinmux(19), 8, 5 },
135 { pinmux(19), 8, 4 },
136 { pinmux(19), 8, 3 },
137 { pinmux(19), 8, 2 },
138 { pinmux(16), 8, 1 },
139 { pinmux(14), 8, 1 },
140 { pinmux(14), 8, 0 },
141 { pinmux(13), 8, 7 },
142 { pinmux(13), 8, 6 },
143 { pinmux(13), 8, 5 },
144 { pinmux(13), 8, 4 },
145 { pinmux(13), 8, 3 },
146 { pinmux(13), 8, 2 },
147 { pinmux(13), 8, 1 },
148 { pinmux(13), 8, 0 },
149 { pinmux(18), 8, 1 }, /* GP7[0] */
150 { pinmux(18), 8, 0 },
151 { pinmux(17), 8, 7 },
152 { pinmux(17), 8, 6 },
153 { pinmux(17), 8, 5 },
154 { pinmux(17), 8, 4 },
155 { pinmux(17), 8, 3 },
156 { pinmux(17), 8, 2 },
157 { pinmux(17), 8, 1 },
158 { pinmux(17), 8, 0 },
159 { pinmux(16), 8, 7 },
160 { pinmux(16), 8, 6 },
161 { pinmux(16), 8, 5 },
162 { pinmux(16), 8, 4 },
163 { pinmux(16), 8, 3 },
164 { pinmux(16), 8, 2 },
165 { pinmux(19), 8, 0 }, /* GP8[0] */
173 { pinmux(19), 8, 1 },
174 { pinmux(19), 8, 0 },
175 { pinmux(18), 8, 7 },
176 { pinmux(18), 8, 6 },
177 { pinmux(18), 8, 5 },
178 { pinmux(18), 8, 4 },
179 { pinmux(18), 8, 3 },
180 { pinmux(18), 8, 2 },
183 int gpio_request(unsigned gpio, const char *label)
185 if (gpio >= MAX_NUM_GPIOS)
188 if (gpio_registry[gpio].is_registered)
191 gpio_registry[gpio].is_registered = 1;
192 strncpy(gpio_registry[gpio].name, label, GPIO_NAME_SIZE);
193 gpio_registry[gpio].name[GPIO_NAME_SIZE - 1] = 0;
195 davinci_configure_pin_mux(&gpio_pinmux[gpio], 1);
200 int gpio_free(unsigned gpio)
202 if (gpio >= MAX_NUM_GPIOS)
205 if (!gpio_registry[gpio].is_registered)
208 gpio_registry[gpio].is_registered = 0;
209 gpio_registry[gpio].name[0] = '\0';
210 /* Do not configure as input or change pin mux here */
214 int gpio_direction_input(unsigned gpio)
216 struct davinci_gpio *bank;
218 bank = GPIO_BANK(gpio);
219 setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
223 int gpio_direction_output(unsigned gpio, int value)
225 struct davinci_gpio *bank;
227 bank = GPIO_BANK(gpio);
228 clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
229 gpio_set_value(gpio, value);
233 int gpio_get_value(unsigned gpio)
235 struct davinci_gpio *bank;
238 bank = GPIO_BANK(gpio);
239 ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gpio));
243 int gpio_set_value(unsigned gpio, int value)
245 struct davinci_gpio *bank;
247 bank = GPIO_BANK(gpio);
250 bank->set_data = 1U << GPIO_BIT(gpio);
252 bank->clr_data = 1U << GPIO_BIT(gpio);
259 unsigned gpio, dir, val;
260 struct davinci_gpio *bank;
262 for (gpio = 0; gpio < MAX_NUM_GPIOS; ++gpio) {
263 bank = GPIO_BANK(gpio);
264 dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gpio));
265 val = gpio_get_value(gpio);
267 printf("% 4d: %s: %d [%c] %s\n",
268 gpio, dir ? " in" : "out", val,
269 gpio_registry[gpio].is_registered ? 'x' : ' ',
270 gpio_registry[gpio].name);