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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>
26#include <asm/arch/gpio.h>
27#include <asm/arch/hardware.h>
28#include <asm/arch/davinci_misc.h>
29
Laurence Withers3ffd9682011-07-18 09:26:01 -040030static struct gpio_registry {
31 int is_registered;
32 char name[GPIO_NAME_SIZE];
33} gpio_registry[MAX_NUM_GPIOS];
34
Laurence Withers3ffd9682011-07-18 09:26:01 -040035#define pinmux(x) (&davinci_syscfg_regs->pinmux[x])
36
37static const struct pinmux_config gpio_pinmux[] = {
38 { pinmux(1), 8, 7 }, /* GP0[0] */
39 { pinmux(1), 8, 6 },
40 { pinmux(1), 8, 5 },
41 { pinmux(1), 8, 4 },
42 { pinmux(1), 8, 3 },
43 { pinmux(1), 8, 2 },
44 { pinmux(1), 8, 1 },
45 { pinmux(1), 8, 0 },
46 { pinmux(0), 8, 7 },
47 { pinmux(0), 8, 6 },
48 { pinmux(0), 8, 5 },
49 { pinmux(0), 8, 4 },
50 { pinmux(0), 8, 3 },
51 { pinmux(0), 8, 2 },
52 { pinmux(0), 8, 1 },
53 { pinmux(0), 8, 0 },
54 { pinmux(4), 8, 7 }, /* GP1[0] */
55 { pinmux(4), 8, 6 },
56 { pinmux(4), 8, 5 },
57 { pinmux(4), 8, 4 },
58 { pinmux(4), 8, 3 },
59 { pinmux(4), 8, 2 },
60 { pinmux(4), 4, 1 },
61 { pinmux(4), 4, 0 },
62 { pinmux(3), 4, 0 },
63 { pinmux(2), 4, 6 },
64 { pinmux(2), 4, 5 },
65 { pinmux(2), 4, 4 },
66 { pinmux(2), 4, 3 },
67 { pinmux(2), 4, 2 },
68 { pinmux(2), 4, 1 },
69 { pinmux(2), 8, 0 },
70 { pinmux(6), 8, 7 }, /* GP2[0] */
71 { pinmux(6), 8, 6 },
72 { pinmux(6), 8, 5 },
73 { pinmux(6), 8, 4 },
74 { pinmux(6), 8, 3 },
75 { pinmux(6), 8, 2 },
76 { pinmux(6), 8, 1 },
77 { pinmux(6), 8, 0 },
78 { pinmux(5), 8, 7 },
79 { pinmux(5), 8, 6 },
80 { pinmux(5), 8, 5 },
81 { pinmux(5), 8, 4 },
82 { pinmux(5), 8, 3 },
83 { pinmux(5), 8, 2 },
84 { pinmux(5), 8, 1 },
85 { pinmux(5), 8, 0 },
86 { pinmux(8), 8, 7 }, /* GP3[0] */
87 { pinmux(8), 8, 6 },
88 { pinmux(8), 8, 5 },
89 { pinmux(8), 8, 4 },
90 { pinmux(8), 8, 3 },
91 { pinmux(8), 8, 2 },
92 { pinmux(8), 8, 1 },
93 { pinmux(8), 8, 0 },
94 { pinmux(7), 8, 7 },
95 { pinmux(7), 8, 6 },
96 { pinmux(7), 8, 5 },
97 { pinmux(7), 8, 4 },
98 { pinmux(7), 8, 3 },
99 { pinmux(7), 8, 2 },
100 { pinmux(7), 8, 1 },
101 { pinmux(7), 8, 0 },
102 { pinmux(10), 8, 7 }, /* GP4[0] */
103 { pinmux(10), 8, 6 },
104 { pinmux(10), 8, 5 },
105 { pinmux(10), 8, 4 },
106 { pinmux(10), 8, 3 },
107 { pinmux(10), 8, 2 },
108 { pinmux(10), 8, 1 },
109 { pinmux(10), 8, 0 },
110 { pinmux(9), 8, 7 },
111 { pinmux(9), 8, 6 },
112 { pinmux(9), 8, 5 },
113 { pinmux(9), 8, 4 },
114 { pinmux(9), 8, 3 },
115 { pinmux(9), 8, 2 },
116 { pinmux(9), 8, 1 },
117 { pinmux(9), 8, 0 },
118 { pinmux(12), 8, 7 }, /* GP5[0] */
119 { pinmux(12), 8, 6 },
120 { pinmux(12), 8, 5 },
121 { pinmux(12), 8, 4 },
122 { pinmux(12), 8, 3 },
123 { pinmux(12), 8, 2 },
124 { pinmux(12), 8, 1 },
125 { pinmux(12), 8, 0 },
126 { pinmux(11), 8, 7 },
127 { pinmux(11), 8, 6 },
128 { pinmux(11), 8, 5 },
129 { pinmux(11), 8, 4 },
130 { pinmux(11), 8, 3 },
131 { pinmux(11), 8, 2 },
132 { pinmux(11), 8, 1 },
133 { pinmux(11), 8, 0 },
134 { pinmux(19), 8, 6 }, /* GP6[0] */
135 { pinmux(19), 8, 5 },
136 { pinmux(19), 8, 4 },
137 { pinmux(19), 8, 3 },
138 { pinmux(19), 8, 2 },
139 { pinmux(16), 8, 1 },
140 { pinmux(14), 8, 1 },
141 { pinmux(14), 8, 0 },
142 { pinmux(13), 8, 7 },
143 { pinmux(13), 8, 6 },
144 { pinmux(13), 8, 5 },
145 { pinmux(13), 8, 4 },
146 { pinmux(13), 8, 3 },
147 { pinmux(13), 8, 2 },
148 { pinmux(13), 8, 1 },
149 { pinmux(13), 8, 0 },
150 { pinmux(18), 8, 1 }, /* GP7[0] */
151 { pinmux(18), 8, 0 },
152 { pinmux(17), 8, 7 },
153 { pinmux(17), 8, 6 },
154 { pinmux(17), 8, 5 },
155 { pinmux(17), 8, 4 },
156 { pinmux(17), 8, 3 },
157 { pinmux(17), 8, 2 },
158 { pinmux(17), 8, 1 },
159 { pinmux(17), 8, 0 },
160 { pinmux(16), 8, 7 },
161 { pinmux(16), 8, 6 },
162 { pinmux(16), 8, 5 },
163 { pinmux(16), 8, 4 },
164 { pinmux(16), 8, 3 },
165 { pinmux(16), 8, 2 },
166 { pinmux(19), 8, 0 }, /* GP8[0] */
167 { pinmux(3), 4, 7 },
168 { pinmux(3), 4, 6 },
169 { pinmux(3), 4, 5 },
170 { pinmux(3), 4, 4 },
171 { pinmux(3), 4, 3 },
172 { pinmux(3), 4, 2 },
173 { pinmux(2), 4, 7 },
174 { pinmux(19), 8, 1 },
175 { pinmux(19), 8, 0 },
176 { pinmux(18), 8, 7 },
177 { pinmux(18), 8, 6 },
178 { pinmux(18), 8, 5 },
179 { pinmux(18), 8, 4 },
180 { pinmux(18), 8, 3 },
181 { pinmux(18), 8, 2 },
182};
183
Laurence Withers3ffd9682011-07-18 09:26:01 -0400184int gpio_request(int gp, const char *label)
185{
186 if (gp >= MAX_NUM_GPIOS)
187 return -1;
188
189 if (gpio_registry[gp].is_registered)
190 return -1;
191
192 gpio_registry[gp].is_registered = 1;
193 strncpy(gpio_registry[gp].name, label, GPIO_NAME_SIZE);
194 gpio_registry[gp].name[GPIO_NAME_SIZE - 1] = 0;
195
196 davinci_configure_pin_mux(&gpio_pinmux[gp], 1);
197
198 return 0;
199}
200
Laurence Withers3ffd9682011-07-18 09:26:01 -0400201void gpio_free(int gp)
202{
203 gpio_registry[gp].is_registered = 0;
204}
205
Laurence Withers3ffd9682011-07-18 09:26:01 -0400206void gpio_toggle_value(int gp)
207{
208 struct davinci_gpio *bank;
209
210 bank = GPIO_BANK(gp);
211 gpio_set_value(gp, !gpio_get_value(gp));
212}
213
Laurence Withers3ffd9682011-07-18 09:26:01 -0400214int gpio_direction_input(int gp)
215{
216 struct davinci_gpio *bank;
217
218 bank = GPIO_BANK(gp);
219 setbits_le32(&bank->dir, 1U << GPIO_BIT(gp));
220 return 0;
221}
222
Laurence Withers3ffd9682011-07-18 09:26:01 -0400223int gpio_direction_output(int gp, int value)
224{
225 struct davinci_gpio *bank;
226
227 bank = GPIO_BANK(gp);
228 clrbits_le32(&bank->dir, 1U << GPIO_BIT(gp));
229 gpio_set_value(gp, value);
230 return 0;
231}
232
Laurence Withers3ffd9682011-07-18 09:26:01 -0400233int gpio_get_value(int gp)
234{
235 struct davinci_gpio *bank;
236 unsigned int ip;
237
238 bank = GPIO_BANK(gp);
239 ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gp));
240 return ip ? 1 : 0;
241}
242
Laurence Withers3ffd9682011-07-18 09:26:01 -0400243void gpio_set_value(int gp, int value)
244{
245 struct davinci_gpio *bank;
246
247 bank = GPIO_BANK(gp);
248
249 if (value)
250 bank->set_data = 1U << GPIO_BIT(gp);
251 else
252 bank->clr_data = 1U << GPIO_BIT(gp);
253}
254
Laurence Withers3ffd9682011-07-18 09:26:01 -0400255void gpio_info(void)
256{
257 int gp, dir, val;
258 struct davinci_gpio *bank;
259
260 for (gp = 0; gp < MAX_NUM_GPIOS; ++gp) {
261 bank = GPIO_BANK(gp);
262 dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gp));
263 val = gpio_get_value(gp);
264
265 printf("% 4d: %s: %d [%c] %s\n",
266 gp, dir ? " in" : "out", val,
267 gpio_registry[gp].is_registered ? 'x' : ' ',
268 gpio_registry[gp].name);
269 }
270}