2 * linux/arch/arm/plat-omap/i2c.c
4 * Helper module for board specific I2C bus registration
6 * Copyright (C) 2007 Nokia Corporation.
8 * Contact: Jarkko Nikula <jhnikula@gmail.com>
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.
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.
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
26 #include <linux/kernel.h>
27 #include <linux/platform_device.h>
28 #include <linux/i2c.h>
29 #include <mach/irqs.h>
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
38 static const char name[] = "i2c_omap";
40 #define I2C_RESOURCE_BUILDER(base, irq) \
43 .end = (base) + OMAP_I2C_SIZE, \
44 .flags = IORESOURCE_MEM, \
48 .flags = IORESOURCE_IRQ, \
51 static 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) },
56 #if defined(CONFIG_ARCH_OMAP34XX)
57 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, INT_34XX_I2C3_IRQ) },
61 #define I2C_DEV_BUILDER(bus_id, res, data) \
65 .num_resources = ARRAY_SIZE(res), \
68 .platform_data = (data), \
72 static u32 i2c_rate[ARRAY_SIZE(i2c_resources)];
73 static 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]),
78 #if defined(CONFIG_ARCH_OMAP34XX)
79 I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_rate[2]),
83 #define OMAP_I2C_CMDLINE_SETUP (BIT(31))
85 static int __init omap_i2c_nr_ports(void)
89 if (cpu_class_is_omap1())
91 else if (cpu_is_omap24xx())
93 else if (cpu_is_omap34xx())
99 static int __init omap_i2c_add_bus(int bus_id)
101 struct platform_device *pdev;
102 struct resource *res;
103 resource_size_t base, irq;
105 pdev = &omap_i2c_devices[bus_id - 1];
107 res = pdev->resource;
108 if (cpu_class_is_omap1()) {
109 base = OMAP1_I2C_BASE;
112 base = OMAP2_I2C_BASE1;
113 irq = INT_24XX_I2C1_IRQ;
116 res[0].end = base + OMAP_I2C_SIZE;
120 return platform_device_register(pdev);
124 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
125 * @str: String of options
127 * This function allow to override the default I2C bus speed for given I2C
128 * bus with a command line option.
130 * Format: i2c_bus=bus_id,clkrate (in kHz)
132 * Returns 1 on success, 0 otherwise.
134 static int __init omap_i2c_bus_setup(char *str)
139 ports = omap_i2c_nr_ports();
140 get_options(str, 3, ints);
141 if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
143 i2c_rate[ints[1] - 1] = ints[2];
144 i2c_rate[ints[1] - 1] |= OMAP_I2C_CMDLINE_SETUP;
148 __setup("i2c_bus=", omap_i2c_bus_setup);
151 * Register busses defined in command line but that are not registered with
152 * omap_register_i2c_bus from board initialization code.
154 static int __init omap_register_i2c_bus_cmdline(void)
158 for (i = 0; i < ARRAY_SIZE(i2c_rate); i++)
159 if (i2c_rate[i] & OMAP_I2C_CMDLINE_SETUP) {
160 i2c_rate[i] &= ~OMAP_I2C_CMDLINE_SETUP;
161 err = omap_i2c_add_bus(i + 1);
169 subsys_initcall(omap_register_i2c_bus_cmdline);
172 * omap_plat_register_i2c_bus - register I2C bus with device descriptors
173 * @bus_id: bus id counting from number 1
174 * @clkrate: clock rate of the bus in kHz
175 * @info: pointer into I2C device descriptor table or NULL
176 * @len: number of descriptors in the table
178 * Returns 0 on success or an error code.
180 int __init omap_plat_register_i2c_bus(int bus_id, u32 clkrate,
181 struct i2c_board_info const *info,
186 BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
189 err = i2c_register_board_info(bus_id, info, len);
194 if (!i2c_rate[bus_id - 1])
195 i2c_rate[bus_id - 1] = clkrate;
196 i2c_rate[bus_id - 1] &= ~OMAP_I2C_CMDLINE_SETUP;
198 return omap_i2c_add_bus(bus_id);