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85d05fb3 JN |
1 | /* |
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 | * | |
ddf25dfe | 8 | * Contact: Jarkko Nikula <jhnikula@gmail.com> |
85d05fb3 JN |
9 | * |
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> | |
3a8761c0 | 29 | #include <linux/i2c-omap.h> |
4d17aeb1 PW |
30 | #include <linux/slab.h> |
31 | #include <linux/err.h> | |
32 | #include <linux/clk.h> | |
20c9d2c4 | 33 | |
01480bad | 34 | #include <plat/i2c.h> |
e4c060db | 35 | |
4d17aeb1 PW |
36 | #define OMAP_I2C_MAX_CONTROLLERS 4 |
37 | static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS]; | |
85d05fb3 | 38 | |
7954763b JN |
39 | #define OMAP_I2C_CMDLINE_SETUP (BIT(31)) |
40 | ||
3a853fb9 JN |
41 | /** |
42 | * omap_i2c_bus_setup - Process command line options for the I2C bus speed | |
43 | * @str: String of options | |
44 | * | |
45 | * This function allow to override the default I2C bus speed for given I2C | |
46 | * bus with a command line option. | |
47 | * | |
48 | * Format: i2c_bus=bus_id,clkrate (in kHz) | |
49 | * | |
50 | * Returns 1 on success, 0 otherwise. | |
51 | */ | |
52 | static int __init omap_i2c_bus_setup(char *str) | |
53 | { | |
3a853fb9 JN |
54 | int ints[3]; |
55 | ||
3a853fb9 | 56 | get_options(str, 3, ints); |
c34f7c69 TL |
57 | if (ints[0] < 2 || ints[1] < 1 || |
58 | ints[1] > OMAP_I2C_MAX_CONTROLLERS) | |
3a853fb9 | 59 | return 0; |
20c9d2c4 KJ |
60 | i2c_pdata[ints[1] - 1].clkrate = ints[2]; |
61 | i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP; | |
3a853fb9 JN |
62 | |
63 | return 1; | |
64 | } | |
65 | __setup("i2c_bus=", omap_i2c_bus_setup); | |
66 | ||
7954763b JN |
67 | /* |
68 | * Register busses defined in command line but that are not registered with | |
69 | * omap_register_i2c_bus from board initialization code. | |
70 | */ | |
a6cf912c | 71 | int __init omap_register_i2c_bus_cmdline(void) |
7954763b JN |
72 | { |
73 | int i, err = 0; | |
74 | ||
20c9d2c4 KJ |
75 | for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++) |
76 | if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) { | |
77 | i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP; | |
3a8761c0 | 78 | err = omap_i2c_add_bus(&i2c_pdata[i], i + 1); |
7954763b JN |
79 | if (err) |
80 | goto out; | |
81 | } | |
82 | ||
83 | out: | |
84 | return err; | |
85 | } | |
7954763b | 86 | |
d4c58bf4 | 87 | /** |
9833eff3 | 88 | * omap_register_i2c_bus - register I2C bus with device descriptors |
d4c58bf4 JN |
89 | * @bus_id: bus id counting from number 1 |
90 | * @clkrate: clock rate of the bus in kHz | |
91 | * @info: pointer into I2C device descriptor table or NULL | |
92 | * @len: number of descriptors in the table | |
93 | * | |
94 | * Returns 0 on success or an error code. | |
95 | */ | |
9833eff3 | 96 | int __init omap_register_i2c_bus(int bus_id, u32 clkrate, |
85d05fb3 JN |
97 | struct i2c_board_info const *info, |
98 | unsigned len) | |
99 | { | |
3a853fb9 | 100 | int err; |
85d05fb3 | 101 | |
c34f7c69 | 102 | BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS); |
85d05fb3 JN |
103 | |
104 | if (info) { | |
105 | err = i2c_register_board_info(bus_id, info, len); | |
106 | if (err) | |
107 | return err; | |
108 | } | |
109 | ||
20c9d2c4 KJ |
110 | if (!i2c_pdata[bus_id - 1].clkrate) |
111 | i2c_pdata[bus_id - 1].clkrate = clkrate; | |
112 | ||
113 | i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP; | |
85d05fb3 | 114 | |
3a8761c0 | 115 | return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id); |
85d05fb3 | 116 | } |