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 <linux/i2c-omap.h>
31 #include <mach/irqs.h>
34 #include <plat/omap-pm.h>
36 #define OMAP_I2C_SIZE 0x3f
37 #define OMAP1_I2C_BASE 0xfffb3800
38 #define OMAP2_I2C_BASE1 0x48070000
39 #define OMAP2_I2C_BASE2 0x48072000
40 #define OMAP2_I2C_BASE3 0x48060000
41 #define OMAP4_I2C_BASE4 0x48350000
43 static const char name[] = "i2c_omap";
45 #define I2C_RESOURCE_BUILDER(base, irq) \
48 .end = (base) + OMAP_I2C_SIZE, \
49 .flags = IORESOURCE_MEM, \
53 .flags = IORESOURCE_IRQ, \
56 static struct resource i2c_resources[][2] = {
57 { I2C_RESOURCE_BUILDER(0, 0) },
58 #if defined(CONFIG_ARCH_OMAP2PLUS)
59 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE2, 0) },
61 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
62 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, 0) },
64 #if defined(CONFIG_ARCH_OMAP4)
65 { I2C_RESOURCE_BUILDER(OMAP4_I2C_BASE4, 0) },
69 #define I2C_DEV_BUILDER(bus_id, res, data) \
73 .num_resources = ARRAY_SIZE(res), \
76 .platform_data = (data), \
80 static struct omap_i2c_bus_platform_data i2c_pdata[ARRAY_SIZE(i2c_resources)];
81 static struct platform_device omap_i2c_devices[] = {
82 I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]),
83 #if defined(CONFIG_ARCH_OMAP2PLUS)
84 I2C_DEV_BUILDER(2, i2c_resources[1], &i2c_pdata[1]),
86 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
87 I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_pdata[2]),
89 #if defined(CONFIG_ARCH_OMAP4)
90 I2C_DEV_BUILDER(4, i2c_resources[3], &i2c_pdata[3]),
94 #define OMAP_I2C_CMDLINE_SETUP (BIT(31))
96 static int __init omap_i2c_nr_ports(void)
100 if (cpu_class_is_omap1())
102 else if (cpu_is_omap24xx())
104 else if (cpu_is_omap34xx())
106 else if (cpu_is_omap44xx())
112 /* Shared between omap2 and 3 */
113 static resource_size_t omap2_i2c_irq[3] __initdata = {
119 static resource_size_t omap4_i2c_irq[4] __initdata = {
126 static inline int omap1_i2c_add_bus(struct platform_device *pdev, int bus_id)
128 struct omap_i2c_bus_platform_data *pd;
129 struct resource *res;
131 pd = pdev->dev.platform_data;
132 res = pdev->resource;
133 res[0].start = OMAP1_I2C_BASE;
134 res[0].end = res[0].start + OMAP_I2C_SIZE;
135 res[1].start = INT_I2C;
136 omap1_i2c_mux_pins(bus_id);
138 return platform_device_register(pdev);
142 * XXX This function is a temporary compatibility wrapper - only
143 * needed until the I2C driver can be converted to call
144 * omap_pm_set_max_dev_wakeup_lat() and handle a return code.
146 static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t)
148 omap_pm_set_max_mpu_wakeup_lat(dev, t);
151 static inline int omap2_i2c_add_bus(struct platform_device *pdev, int bus_id)
153 struct resource *res;
154 resource_size_t *irq;
156 res = pdev->resource;
158 if (!cpu_is_omap44xx())
164 res[0].start = OMAP2_I2C_BASE1;
165 res[0].end = res[0].start + OMAP_I2C_SIZE;
168 res[1].start = irq[bus_id - 1];
169 omap2_i2c_mux_pins(bus_id);
172 * When waiting for completion of a i2c transfer, we need to
173 * set a wake up latency constraint for the MPU. This is to
174 * ensure quick enough wakeup from idle, when transfer
177 if (cpu_is_omap34xx()) {
178 struct omap_i2c_bus_platform_data *pd;
180 pd = pdev->dev.platform_data;
181 pd->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat;
184 return platform_device_register(pdev);
187 static int __init omap_i2c_add_bus(int bus_id)
189 struct platform_device *pdev;
191 pdev = &omap_i2c_devices[bus_id - 1];
193 if (cpu_class_is_omap1())
194 return omap1_i2c_add_bus(pdev, bus_id);
196 return omap2_i2c_add_bus(pdev, bus_id);
200 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
201 * @str: String of options
203 * This function allow to override the default I2C bus speed for given I2C
204 * bus with a command line option.
206 * Format: i2c_bus=bus_id,clkrate (in kHz)
208 * Returns 1 on success, 0 otherwise.
210 static int __init omap_i2c_bus_setup(char *str)
215 ports = omap_i2c_nr_ports();
216 get_options(str, 3, ints);
217 if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
219 i2c_pdata[ints[1] - 1].clkrate = ints[2];
220 i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
224 __setup("i2c_bus=", omap_i2c_bus_setup);
227 * Register busses defined in command line but that are not registered with
228 * omap_register_i2c_bus from board initialization code.
230 static int __init omap_register_i2c_bus_cmdline(void)
234 for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
235 if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
236 i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
237 err = omap_i2c_add_bus(i + 1);
245 subsys_initcall(omap_register_i2c_bus_cmdline);
248 * omap_register_i2c_bus - register I2C bus with device descriptors
249 * @bus_id: bus id counting from number 1
250 * @clkrate: clock rate of the bus in kHz
251 * @info: pointer into I2C device descriptor table or NULL
252 * @len: number of descriptors in the table
254 * Returns 0 on success or an error code.
256 int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
257 struct i2c_board_info const *info,
262 BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
265 err = i2c_register_board_info(bus_id, info, len);
270 if (!i2c_pdata[bus_id - 1].clkrate)
271 i2c_pdata[bus_id - 1].clkrate = clkrate;
273 i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
275 return omap_i2c_add_bus(bus_id);