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authorJarkko Nikula <jarkko.nikula@nokia.com>2007-11-06 23:54:31 -0500
committerTony Lindgren <tony@atomide.com>2008-02-08 13:38:00 -0500
commit85d05fb3fde692fdaa6b1f84c33fee718abebf0f (patch)
treebb6d31c2b3df0c74a3ec48c464bf310763453881 /arch/arm
parentce2df9ca41997f38cdfb9bee0db08763487222ae (diff)
ARM: OMAP: Add helper module for board specific I2C bus registration
This helper module simplifies I2C bus registration for different OMAP platforms by doing registration in one place only and to allow board specific bus configuration like clock rate and number of busses configured. Helper should cover OMAP processors from first to third generation. This patch just adds the feature and current implementation cleanup and board file modifications will be done in following patches. Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/plat-omap/Makefile1
-rw-r--r--arch/arm/plat-omap/i2c.c148
2 files changed, 149 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile
index 2549129aabc6..ce17df31b845 100644
--- a/arch/arm/plat-omap/Makefile
+++ b/arch/arm/plat-omap/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
19obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o 19obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
20obj-$(CONFIG_OMAP_DEBUG_DEVICES) += debug-devices.o 20obj-$(CONFIG_OMAP_DEBUG_DEVICES) += debug-devices.o
21obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o 21obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o
22obj-$(CONFIG_I2C_OMAP) += i2c.o
diff --git a/arch/arm/plat-omap/i2c.c b/arch/arm/plat-omap/i2c.c
new file mode 100644
index 000000000000..7990ab185bb1
--- /dev/null
+++ b/arch/arm/plat-omap/i2c.c
@@ -0,0 +1,148 @@
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 *
8 * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
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>
29#include <asm/mach-types.h>
30#include <asm/arch/mux.h>
31
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
37
38static const char name[] = "i2c_omap";
39
40#define I2C_RESOURCE_BUILDER(base, irq) \
41 { \
42 .start = (base), \
43 .end = (base) + OMAP_I2C_SIZE, \
44 .flags = IORESOURCE_MEM, \
45 }, \
46 { \
47 .start = (irq), \
48 .flags = IORESOURCE_IRQ, \
49 },
50
51static 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) },
55#endif
56#if defined(CONFIG_ARCH_OMAP34XX)
57 { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, INT_34XX_I2C3_IRQ) },
58#endif
59};
60
61#define I2C_DEV_BUILDER(bus_id, res, data) \
62 { \
63 .id = (bus_id), \
64 .name = name, \
65 .num_resources = ARRAY_SIZE(res), \
66 .resource = (res), \
67 .dev = { \
68 .platform_data = (data), \
69 }, \
70 }
71
72static u32 i2c_rate[ARRAY_SIZE(i2c_resources)];
73static 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]),
77#endif
78#if defined(CONFIG_ARCH_OMAP34XX)
79 I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_rate[2]),
80#endif
81};
82
83static void __init omap_i2c_mux_pins(int bus_id)
84{
85 /* TODO: Muxing for OMAP3 */
86 switch (bus_id) {
87 case 1:
88 if (cpu_class_is_omap1()) {
89 omap_cfg_reg(I2C_SCL);
90 omap_cfg_reg(I2C_SDA);
91 } else if (cpu_is_omap24xx()) {
92 omap_cfg_reg(M19_24XX_I2C1_SCL);
93 omap_cfg_reg(L15_24XX_I2C1_SDA);
94 }
95 break;
96 case 2:
97 if (cpu_is_omap24xx()) {
98 omap_cfg_reg(J15_24XX_I2C2_SCL);
99 omap_cfg_reg(H19_24XX_I2C2_SDA);
100 }
101 break;
102 }
103}
104
105int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
106 struct i2c_board_info const *info,
107 unsigned len)
108{
109 int ports, err;
110 struct platform_device *pdev;
111 struct resource *res;
112 resource_size_t base, irq;
113
114 if (cpu_class_is_omap1())
115 ports = 1;
116 else if (cpu_is_omap24xx())
117 ports = 2;
118 else if (cpu_is_omap34xx())
119 ports = 3;
120
121 BUG_ON(bus_id < 1 || bus_id > ports);
122
123 if (info) {
124 err = i2c_register_board_info(bus_id, info, len);
125 if (err)
126 return err;
127 }
128
129 pdev = &omap_i2c_devices[bus_id - 1];
130 *(u32 *)pdev->dev.platform_data = clkrate;
131
132 if (bus_id == 1) {
133 res = pdev->resource;
134 if (cpu_class_is_omap1()) {
135 base = OMAP1_I2C_BASE;
136 irq = INT_I2C;
137 } else {
138 base = OMAP2_I2C_BASE1;
139 irq = INT_24XX_I2C1_IRQ;
140 }
141 res[0].start = base;
142 res[0].end = base + OMAP_I2C_SIZE;
143 res[1].start = irq;
144 }
145
146 omap_i2c_mux_pins(bus_id);
147 return platform_device_register(pdev);
148}