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1/*
2 * Helper module for board specific I2C bus registration
3 *
4 * Copyright (C) 2009 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22#include <linux/i2c-omap.h>
23#include <mach/mux.h>
24#include "soc.h"
25
26#include <plat/i2c.h>
27
28#define OMAP_I2C_SIZE 0x3f
29#define OMAP1_I2C_BASE 0xfffb3800
30#define OMAP1_INT_I2C (32 + 4)
31
32static const char name[] = "omap_i2c";
33
34static struct resource i2c_resources[2] = {
35};
36
37static struct platform_device omap_i2c_devices[1] = {
38};
39
40static void __init omap1_i2c_mux_pins(int bus_id)
41{
42 if (cpu_is_omap7xx()) {
43 omap_cfg_reg(I2C_7XX_SDA);
44 omap_cfg_reg(I2C_7XX_SCL);
45 } else {
46 omap_cfg_reg(I2C_SDA);
47 omap_cfg_reg(I2C_SCL);
48 }
49}
50
51int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
52 int bus_id)
53{
54 struct platform_device *pdev;
55 struct resource *res;
56
57 if (bus_id > 1)
58 return -EINVAL;
59
60 omap1_i2c_mux_pins(bus_id);
61
62 pdev = &omap_i2c_devices[bus_id - 1];
63 pdev->id = bus_id;
64 pdev->name = name;
65 pdev->num_resources = ARRAY_SIZE(i2c_resources);
66 res = i2c_resources;
67 res[0].start = OMAP1_I2C_BASE;
68 res[0].end = res[0].start + OMAP_I2C_SIZE;
69 res[0].flags = IORESOURCE_MEM;
70 res[1].start = OMAP1_INT_I2C;
71 res[1].flags = IORESOURCE_IRQ;
72 pdev->resource = res;
73
74 /* all OMAP1 have IP version 1 register set */
75 pdata->rev = OMAP_I2C_IP_VERSION_1;
76
77 /* all OMAP1 I2C are implemented like this */
78 pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
79 OMAP_I2C_FLAG_SIMPLE_CLOCK |
80 OMAP_I2C_FLAG_16BIT_DATA_REG |
81 OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
82
83 /* how the cpu bus is wired up differs for 7xx only */
84
85 if (cpu_is_omap7xx())
86 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
87 else
88 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
89
90 pdev->dev.platform_data = pdata;
91
92 return platform_device_register(pdev);
93}
94
95static int __init omap_i2c_cmdline(void)
96{
97 return omap_register_i2c_bus_cmdline();
98}
99subsys_initcall(omap_i2c_cmdline);
1/*
2 * Helper module for board specific I2C bus registration
3 *
4 * Copyright (C) 2009 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22#include <linux/i2c.h>
23#include <linux/i2c-omap.h>
24#include <mach/mux.h>
25#include "soc.h"
26
27#define OMAP_I2C_SIZE 0x3f
28#define OMAP1_I2C_BASE 0xfffb3800
29
30static const char name[] = "omap_i2c";
31
32static struct resource i2c_resources[2] = {
33};
34
35static struct platform_device omap_i2c_devices[1] = {
36};
37
38static void __init omap1_i2c_mux_pins(int bus_id)
39{
40 if (cpu_is_omap7xx()) {
41 omap_cfg_reg(I2C_7XX_SDA);
42 omap_cfg_reg(I2C_7XX_SCL);
43 } else {
44 omap_cfg_reg(I2C_SDA);
45 omap_cfg_reg(I2C_SCL);
46 }
47}
48
49int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
50 int bus_id)
51{
52 struct platform_device *pdev;
53 struct resource *res;
54
55 if (bus_id > 1)
56 return -EINVAL;
57
58 omap1_i2c_mux_pins(bus_id);
59
60 pdev = &omap_i2c_devices[bus_id - 1];
61 pdev->id = bus_id;
62 pdev->name = name;
63 pdev->num_resources = ARRAY_SIZE(i2c_resources);
64 res = i2c_resources;
65 res[0].start = OMAP1_I2C_BASE;
66 res[0].end = res[0].start + OMAP_I2C_SIZE;
67 res[0].flags = IORESOURCE_MEM;
68 res[1].start = INT_I2C;
69 res[1].flags = IORESOURCE_IRQ;
70 pdev->resource = res;
71
72 /* all OMAP1 have IP version 1 register set */
73 pdata->rev = OMAP_I2C_IP_VERSION_1;
74
75 /* all OMAP1 I2C are implemented like this */
76 pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
77 OMAP_I2C_FLAG_SIMPLE_CLOCK |
78 OMAP_I2C_FLAG_16BIT_DATA_REG |
79 OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
80
81 /* how the cpu bus is wired up differs for 7xx only */
82
83 if (cpu_is_omap7xx())
84 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
85 else
86 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
87
88 pdev->dev.platform_data = pdata;
89
90 return platform_device_register(pdev);
91}
92
93#define OMAP_I2C_MAX_CONTROLLERS 4
94static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
95
96#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
97
98/**
99 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
100 * @str: String of options
101 *
102 * This function allow to override the default I2C bus speed for given I2C
103 * bus with a command line option.
104 *
105 * Format: i2c_bus=bus_id,clkrate (in kHz)
106 *
107 * Returns 1 on success, 0 otherwise.
108 */
109static int __init omap_i2c_bus_setup(char *str)
110{
111 int ints[3];
112
113 get_options(str, 3, ints);
114 if (ints[0] < 2 || ints[1] < 1 ||
115 ints[1] > OMAP_I2C_MAX_CONTROLLERS)
116 return 0;
117 i2c_pdata[ints[1] - 1].clkrate = ints[2];
118 i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
119
120 return 1;
121}
122__setup("i2c_bus=", omap_i2c_bus_setup);
123
124/*
125 * Register busses defined in command line but that are not registered with
126 * omap_register_i2c_bus from board initialization code.
127 */
128int __init omap_register_i2c_bus_cmdline(void)
129{
130 int i, err = 0;
131
132 for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
133 if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
134 i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
135 err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
136 if (err)
137 goto out;
138 }
139
140out:
141 return err;
142}
143
144/**
145 * omap_register_i2c_bus - register I2C bus with device descriptors
146 * @bus_id: bus id counting from number 1
147 * @clkrate: clock rate of the bus in kHz
148 * @info: pointer into I2C device descriptor table or NULL
149 * @len: number of descriptors in the table
150 *
151 * Returns 0 on success or an error code.
152 */
153int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
154 struct i2c_board_info const *info,
155 unsigned len)
156{
157 int err;
158
159 BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
160
161 if (info) {
162 err = i2c_register_board_info(bus_id, info, len);
163 if (err)
164 return err;
165 }
166
167 if (!i2c_pdata[bus_id - 1].clkrate)
168 i2c_pdata[bus_id - 1].clkrate = clkrate;
169
170 i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
171
172 return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
173}
174
175static int __init omap_i2c_cmdline(void)
176{
177 return omap_register_i2c_bus_cmdline();
178}
179subsys_initcall(omap_i2c_cmdline);