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Jarkko Nikula85d05fb2007-11-07 06:54:31 +02001/*
2 * linux/arch/arm/plat-omap/i2c.c
3 *
4 * Helper module for board specific I2C bus registration
5 *
6 * Copyright (C) 2007 Nokia Corporation.
7 *
Jarkko Nikuladdf25df2009-05-25 11:08:43 -07008 * Contact: Jarkko Nikula <jhnikula@gmail.com>
Jarkko Nikula85d05fb2007-11-07 06:54:31 +02009 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 *
24 */
25
26#include <linux/kernel.h>
27#include <linux/platform_device.h>
28#include <linux/i2c.h>
Russell King80b02c12009-01-08 10:01:47 +000029#include <mach/irqs.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010030#include <mach/mux.h>
Jarkko Nikula85d05fb2007-11-07 06:54:31 +020031
32#define OMAP_I2C_SIZE 0x3f
33#define OMAP1_I2C_BASE 0xfffb3800
34#define OMAP2_I2C_BASE1 0x48070000
35#define OMAP2_I2C_BASE2 0x48072000
36#define OMAP2_I2C_BASE3 0x48060000
37
38static const char name[] = "i2c_omap";
39
40#define I2C_RESOURCE_BUILDER(base, irq) \
41 { \
42 .start = (base), \
43 .end = (base) + OMAP_I2C_SIZE, \
44 .flags = IORESOURCE_MEM, \
45 }, \
46 { \
47 .start = (irq), \
48 .flags = IORESOURCE_IRQ, \
49 },
50
51static struct resource i2c_resources[][2] = {
52 { I2C_RESOURCE_BUILDER(0, 0) },
53#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
54 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE2, INT_24XX_I2C2_IRQ) },
55#endif
56#if defined(CONFIG_ARCH_OMAP34XX)
57 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, INT_34XX_I2C3_IRQ) },
58#endif
59};
60
61#define I2C_DEV_BUILDER(bus_id, res, data) \
62 { \
63 .id = (bus_id), \
64 .name = name, \
65 .num_resources = ARRAY_SIZE(res), \
66 .resource = (res), \
67 .dev = { \
68 .platform_data = (data), \
69 }, \
70 }
71
72static u32 i2c_rate[ARRAY_SIZE(i2c_resources)];
73static struct platform_device omap_i2c_devices[] = {
74 I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_rate[0]),
75#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
76 I2C_DEV_BUILDER(2, i2c_resources[1], &i2c_rate[1]),
77#endif
78#if defined(CONFIG_ARCH_OMAP34XX)
79 I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_rate[2]),
80#endif
81};
82
Jarkko Nikulaad636ad2008-12-10 17:36:52 -080083#if defined(CONFIG_ARCH_OMAP24XX)
84static const int omap24xx_pins[][2] = {
85 { M19_24XX_I2C1_SCL, L15_24XX_I2C1_SDA },
86 { J15_24XX_I2C2_SCL, H19_24XX_I2C2_SDA },
87};
88#else
89static const int omap24xx_pins[][2] = {};
90#endif
91#if defined(CONFIG_ARCH_OMAP34XX)
92static const int omap34xx_pins[][2] = {
93 { K21_34XX_I2C1_SCL, J21_34XX_I2C1_SDA},
94 { AF15_34XX_I2C2_SCL, AE15_34XX_I2C2_SDA},
95 { AF14_34XX_I2C3_SCL, AG14_34XX_I2C3_SDA},
96};
97#else
98static const int omap34xx_pins[][2] = {};
99#endif
100
Jarkko Nikula79547632009-03-23 18:07:48 -0700101#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
102
Jarkko Nikulaad636ad2008-12-10 17:36:52 -0800103static void __init omap_i2c_mux_pins(int bus)
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200104{
Jarkko Nikulaad636ad2008-12-10 17:36:52 -0800105 int scl, sda;
106
107 if (cpu_class_is_omap1()) {
108 scl = I2C_SCL;
109 sda = I2C_SDA;
110 } else if (cpu_is_omap24xx()) {
111 scl = omap24xx_pins[bus][0];
112 sda = omap24xx_pins[bus][1];
113 } else if (cpu_is_omap34xx()) {
114 scl = omap34xx_pins[bus][0];
115 sda = omap34xx_pins[bus][1];
116 } else {
117 return;
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200118 }
Jarkko Nikulaad636ad2008-12-10 17:36:52 -0800119
120 omap_cfg_reg(sda);
121 omap_cfg_reg(scl);
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200122}
123
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700124static int __init omap_i2c_nr_ports(void)
125{
126 int ports = 0;
127
128 if (cpu_class_is_omap1())
129 ports = 1;
130 else if (cpu_is_omap24xx())
131 ports = 2;
132 else if (cpu_is_omap34xx())
133 ports = 3;
134
135 return ports;
136}
137
Jarkko Nikula79547632009-03-23 18:07:48 -0700138static int __init omap_i2c_add_bus(int bus_id)
139{
140 struct platform_device *pdev;
141 struct resource *res;
142 resource_size_t base, irq;
143
144 pdev = &omap_i2c_devices[bus_id - 1];
145 if (bus_id == 1) {
146 res = pdev->resource;
147 if (cpu_class_is_omap1()) {
148 base = OMAP1_I2C_BASE;
149 irq = INT_I2C;
150 } else {
151 base = OMAP2_I2C_BASE1;
152 irq = INT_24XX_I2C1_IRQ;
153 }
154 res[0].start = base;
155 res[0].end = base + OMAP_I2C_SIZE;
156 res[1].start = irq;
157 }
158
159 omap_i2c_mux_pins(bus_id - 1);
160 return platform_device_register(pdev);
161}
162
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700163/**
164 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
165 * @str: String of options
166 *
167 * This function allow to override the default I2C bus speed for given I2C
168 * bus with a command line option.
169 *
170 * Format: i2c_bus=bus_id,clkrate (in kHz)
171 *
172 * Returns 1 on success, 0 otherwise.
173 */
174static int __init omap_i2c_bus_setup(char *str)
175{
176 int ports;
177 int ints[3];
178
179 ports = omap_i2c_nr_ports();
180 get_options(str, 3, ints);
181 if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
182 return 0;
183 i2c_rate[ints[1] - 1] = ints[2];
Jarkko Nikula79547632009-03-23 18:07:48 -0700184 i2c_rate[ints[1] - 1] |= OMAP_I2C_CMDLINE_SETUP;
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700185
186 return 1;
187}
188__setup("i2c_bus=", omap_i2c_bus_setup);
189
Jarkko Nikula79547632009-03-23 18:07:48 -0700190/*
191 * Register busses defined in command line but that are not registered with
192 * omap_register_i2c_bus from board initialization code.
193 */
194static int __init omap_register_i2c_bus_cmdline(void)
195{
196 int i, err = 0;
197
198 for (i = 0; i < ARRAY_SIZE(i2c_rate); i++)
199 if (i2c_rate[i] & OMAP_I2C_CMDLINE_SETUP) {
200 i2c_rate[i] &= ~OMAP_I2C_CMDLINE_SETUP;
201 err = omap_i2c_add_bus(i + 1);
202 if (err)
203 goto out;
204 }
205
206out:
207 return err;
208}
209subsys_initcall(omap_register_i2c_bus_cmdline);
210
Jarkko Nikulad4c58bf2009-03-23 18:07:46 -0700211/**
212 * omap_register_i2c_bus - register I2C bus with device descriptors
213 * @bus_id: bus id counting from number 1
214 * @clkrate: clock rate of the bus in kHz
215 * @info: pointer into I2C device descriptor table or NULL
216 * @len: number of descriptors in the table
217 *
218 * Returns 0 on success or an error code.
219 */
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200220int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
221 struct i2c_board_info const *info,
222 unsigned len)
223{
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700224 int err;
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200225
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700226 BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200227
228 if (info) {
229 err = i2c_register_board_info(bus_id, info, len);
230 if (err)
231 return err;
232 }
233
Jarkko Nikula79547632009-03-23 18:07:48 -0700234 if (!i2c_rate[bus_id - 1])
Jarkko Nikula3a853fb2009-03-23 18:07:47 -0700235 i2c_rate[bus_id - 1] = clkrate;
Jarkko Nikula79547632009-03-23 18:07:48 -0700236 i2c_rate[bus_id - 1] &= ~OMAP_I2C_CMDLINE_SETUP;
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200237
Jarkko Nikula79547632009-03-23 18:07:48 -0700238 return omap_i2c_add_bus(bus_id);
Jarkko Nikula85d05fb2007-11-07 06:54:31 +0200239}