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Laurence Withers3ffd9682011-07-18 09:26:01 -04001/*
2 * GPIO driver for TI DaVinci DA8xx SOCs.
3 *
4 * (C) Copyright 2011 Guralp Systems Ltd.
5 * Laurence Withers <lwithers@guralp.com>
6 *
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.
11 *
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.
16 *
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,
20 * MA 02111-1307 USA
21 */
22
23#include <common.h>
24#include <asm/io.h>
25#include <asm/gpio.h>
Laurence Withers3ffd9682011-07-18 09:26:01 -040026#include <asm/arch/hardware.h>
27#include <asm/arch/davinci_misc.h>
28
Laurence Withers3ffd9682011-07-18 09:26:01 -040029static struct gpio_registry {
30 int is_registered;
31 char name[GPIO_NAME_SIZE];
32} gpio_registry[MAX_NUM_GPIOS];
33
Laurence Withers3ffd9682011-07-18 09:26:01 -040034#define pinmux(x) (&davinci_syscfg_regs->pinmux[x])
35
36static const struct pinmux_config gpio_pinmux[] = {
37 { pinmux(1), 8, 7 }, /* GP0[0] */
38 { pinmux(1), 8, 6 },
39 { pinmux(1), 8, 5 },
40 { pinmux(1), 8, 4 },
41 { pinmux(1), 8, 3 },
42 { pinmux(1), 8, 2 },
43 { pinmux(1), 8, 1 },
44 { pinmux(1), 8, 0 },
45 { pinmux(0), 8, 7 },
46 { pinmux(0), 8, 6 },
47 { pinmux(0), 8, 5 },
48 { pinmux(0), 8, 4 },
49 { pinmux(0), 8, 3 },
50 { pinmux(0), 8, 2 },
51 { pinmux(0), 8, 1 },
52 { pinmux(0), 8, 0 },
53 { pinmux(4), 8, 7 }, /* GP1[0] */
54 { pinmux(4), 8, 6 },
55 { pinmux(4), 8, 5 },
56 { pinmux(4), 8, 4 },
57 { pinmux(4), 8, 3 },
58 { pinmux(4), 8, 2 },
59 { pinmux(4), 4, 1 },
60 { pinmux(4), 4, 0 },
61 { pinmux(3), 4, 0 },
62 { pinmux(2), 4, 6 },
63 { pinmux(2), 4, 5 },
64 { pinmux(2), 4, 4 },
65 { pinmux(2), 4, 3 },
66 { pinmux(2), 4, 2 },
67 { pinmux(2), 4, 1 },
68 { pinmux(2), 8, 0 },
69 { pinmux(6), 8, 7 }, /* GP2[0] */
70 { pinmux(6), 8, 6 },
71 { pinmux(6), 8, 5 },
72 { pinmux(6), 8, 4 },
73 { pinmux(6), 8, 3 },
74 { pinmux(6), 8, 2 },
75 { pinmux(6), 8, 1 },
76 { pinmux(6), 8, 0 },
77 { pinmux(5), 8, 7 },
78 { pinmux(5), 8, 6 },
79 { pinmux(5), 8, 5 },
80 { pinmux(5), 8, 4 },
81 { pinmux(5), 8, 3 },
82 { pinmux(5), 8, 2 },
83 { pinmux(5), 8, 1 },
84 { pinmux(5), 8, 0 },
85 { pinmux(8), 8, 7 }, /* GP3[0] */
86 { pinmux(8), 8, 6 },
87 { pinmux(8), 8, 5 },
88 { pinmux(8), 8, 4 },
89 { pinmux(8), 8, 3 },
90 { pinmux(8), 8, 2 },
91 { pinmux(8), 8, 1 },
92 { pinmux(8), 8, 0 },
93 { pinmux(7), 8, 7 },
94 { pinmux(7), 8, 6 },
95 { pinmux(7), 8, 5 },
96 { pinmux(7), 8, 4 },
97 { pinmux(7), 8, 3 },
98 { pinmux(7), 8, 2 },
99 { pinmux(7), 8, 1 },
100 { pinmux(7), 8, 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 },
109 { pinmux(9), 8, 7 },
110 { pinmux(9), 8, 6 },
111 { pinmux(9), 8, 5 },
112 { pinmux(9), 8, 4 },
113 { pinmux(9), 8, 3 },
114 { pinmux(9), 8, 2 },
115 { pinmux(9), 8, 1 },
116 { pinmux(9), 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] */
166 { pinmux(3), 4, 7 },
167 { pinmux(3), 4, 6 },
168 { pinmux(3), 4, 5 },
169 { pinmux(3), 4, 4 },
170 { pinmux(3), 4, 3 },
171 { pinmux(3), 4, 2 },
172 { pinmux(2), 4, 7 },
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 },
181};
182
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600183int gpio_request(unsigned gpio, const char *label)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400184{
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600185 if (gpio >= MAX_NUM_GPIOS)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400186 return -1;
187
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600188 if (gpio_registry[gpio].is_registered)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400189 return -1;
190
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600191 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;
Laurence Withers3ffd9682011-07-18 09:26:01 -0400194
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600195 davinci_configure_pin_mux(&gpio_pinmux[gpio], 1);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400196
197 return 0;
198}
199
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600200int gpio_free(unsigned gpio)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400201{
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600202 if (gpio >= MAX_NUM_GPIOS)
203 return -1;
Laurence Withers3ffd9682011-07-18 09:26:01 -0400204
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600205 if (!gpio_registry[gpio].is_registered)
206 return -1;
207
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 */
211 return 0;
Laurence Withers3ffd9682011-07-18 09:26:01 -0400212}
213
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600214int gpio_direction_input(unsigned gpio)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400215{
216 struct davinci_gpio *bank;
217
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600218 bank = GPIO_BANK(gpio);
219 setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
Laurence Withers3ffd9682011-07-18 09:26:01 -0400220 return 0;
221}
222
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600223int gpio_direction_output(unsigned gpio, int value)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400224{
225 struct davinci_gpio *bank;
226
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600227 bank = GPIO_BANK(gpio);
228 clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));
229 gpio_set_value(gpio, value);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400230 return 0;
231}
232
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600233int gpio_get_value(unsigned gpio)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400234{
235 struct davinci_gpio *bank;
236 unsigned int ip;
237
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600238 bank = GPIO_BANK(gpio);
239 ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gpio));
Laurence Withers3ffd9682011-07-18 09:26:01 -0400240 return ip ? 1 : 0;
241}
242
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600243int gpio_set_value(unsigned gpio, int value)
Laurence Withers3ffd9682011-07-18 09:26:01 -0400244{
245 struct davinci_gpio *bank;
246
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600247 bank = GPIO_BANK(gpio);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400248
249 if (value)
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600250 bank->set_data = 1U << GPIO_BIT(gpio);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400251 else
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600252 bank->clr_data = 1U << GPIO_BIT(gpio);
253
254 return 0;
Laurence Withers3ffd9682011-07-18 09:26:01 -0400255}
256
Laurence Withers3ffd9682011-07-18 09:26:01 -0400257void gpio_info(void)
258{
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600259 unsigned gpio, dir, val;
Laurence Withers3ffd9682011-07-18 09:26:01 -0400260 struct davinci_gpio *bank;
261
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600262 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);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400266
267 printf("% 4d: %s: %d [%c] %s\n",
Joe Hershbergerf8928f12011-11-11 15:55:36 -0600268 gpio, dir ? " in" : "out", val,
269 gpio_registry[gpio].is_registered ? 'x' : ' ',
270 gpio_registry[gpio].name);
Laurence Withers3ffd9682011-07-18 09:26:01 -0400271 }
272}