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
);
141 static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device
*dev
, long t
)
143 omap_pm_set_max_mpu_wakeup_lat(dev
, t
);
146 static inline int omap2_i2c_add_bus(struct platform_device
*pdev
, int bus_id
)
148 struct resource
*res
;
149 resource_size_t
*irq
;
151 res
= pdev
->resource
;
153 if (!cpu_is_omap44xx())
159 res
[0].start
= OMAP2_I2C_BASE1
;
160 res
[0].end
= res
[0].start
+ OMAP_I2C_SIZE
;
163 res
[1].start
= irq
[bus_id
- 1];
164 omap2_i2c_mux_pins(bus_id
);
167 * When waiting for completion of a i2c transfer, we need to
168 * set a wake up latency constraint for the MPU. This is to
169 * ensure quick enough wakeup from idle, when transfer
172 if (cpu_is_omap34xx()) {
173 struct omap_i2c_bus_platform_data
*pd
;
175 pd
= pdev
->dev
.platform_data
;
176 pd
->set_mpu_wkup_lat
= omap_pm_set_max_mpu_wakeup_lat_compat
;
179 return platform_device_register(pdev
);
182 static int __init
omap_i2c_add_bus(int bus_id
)
184 struct platform_device
*pdev
;
186 pdev
= &omap_i2c_devices
[bus_id
- 1];
188 if (cpu_class_is_omap1())
189 return omap1_i2c_add_bus(pdev
, bus_id
);
191 return omap2_i2c_add_bus(pdev
, bus_id
);
195 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
196 * @str: String of options
198 * This function allow to override the default I2C bus speed for given I2C
199 * bus with a command line option.
201 * Format: i2c_bus=bus_id,clkrate (in kHz)
203 * Returns 1 on success, 0 otherwise.
205 static int __init
omap_i2c_bus_setup(char *str
)
210 ports
= omap_i2c_nr_ports();
211 get_options(str
, 3, ints
);
212 if (ints
[0] < 2 || ints
[1] < 1 || ints
[1] > ports
)
214 i2c_pdata
[ints
[1] - 1].clkrate
= ints
[2];
215 i2c_pdata
[ints
[1] - 1].clkrate
|= OMAP_I2C_CMDLINE_SETUP
;
219 __setup("i2c_bus=", omap_i2c_bus_setup
);
222 * Register busses defined in command line but that are not registered with
223 * omap_register_i2c_bus from board initialization code.
225 static int __init
omap_register_i2c_bus_cmdline(void)
229 for (i
= 0; i
< ARRAY_SIZE(i2c_pdata
); i
++)
230 if (i2c_pdata
[i
].clkrate
& OMAP_I2C_CMDLINE_SETUP
) {
231 i2c_pdata
[i
].clkrate
&= ~OMAP_I2C_CMDLINE_SETUP
;
232 err
= omap_i2c_add_bus(i
+ 1);
240 subsys_initcall(omap_register_i2c_bus_cmdline
);
243 * omap_register_i2c_bus - register I2C bus with device descriptors
244 * @bus_id: bus id counting from number 1
245 * @clkrate: clock rate of the bus in kHz
246 * @info: pointer into I2C device descriptor table or NULL
247 * @len: number of descriptors in the table
249 * Returns 0 on success or an error code.
251 int __init
omap_register_i2c_bus(int bus_id
, u32 clkrate
,
252 struct i2c_board_info
const *info
,
257 BUG_ON(bus_id
< 1 || bus_id
> omap_i2c_nr_ports());
260 err
= i2c_register_board_info(bus_id
, info
, len
);
265 if (!i2c_pdata
[bus_id
- 1].clkrate
)
266 i2c_pdata
[bus_id
- 1].clkrate
= clkrate
;
268 i2c_pdata
[bus_id
- 1].clkrate
&= ~OMAP_I2C_CMDLINE_SETUP
;
270 return omap_i2c_add_bus(bus_id
);