Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 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 | * |
Jarkko Nikula | ddf25df | 2009-05-25 11:08:43 -0700 | [diff] [blame] | 8 | * Contact: Jarkko Nikula <jhnikula@gmail.com> |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 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> |
Russell King | 80b02c1 | 2009-01-08 10:01:47 +0000 | [diff] [blame] | 29 | #include <mach/irqs.h> |
Tony Lindgren | ce491cf | 2009-10-20 09:40:47 -0700 | [diff] [blame^] | 30 | #include <plat/mux.h> |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 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 | |
| 38 | static 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 | |
| 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) }, |
| 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 | |
| 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]), |
| 77 | #endif |
| 78 | #if defined(CONFIG_ARCH_OMAP34XX) |
| 79 | I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_rate[2]), |
| 80 | #endif |
| 81 | }; |
| 82 | |
Jarkko Nikula | ad636ad | 2008-12-10 17:36:52 -0800 | [diff] [blame] | 83 | #if defined(CONFIG_ARCH_OMAP24XX) |
| 84 | static const int omap24xx_pins[][2] = { |
| 85 | { M19_24XX_I2C1_SCL, L15_24XX_I2C1_SDA }, |
| 86 | { J15_24XX_I2C2_SCL, H19_24XX_I2C2_SDA }, |
| 87 | }; |
| 88 | #else |
| 89 | static const int omap24xx_pins[][2] = {}; |
| 90 | #endif |
| 91 | #if defined(CONFIG_ARCH_OMAP34XX) |
| 92 | static const int omap34xx_pins[][2] = { |
| 93 | { K21_34XX_I2C1_SCL, J21_34XX_I2C1_SDA}, |
| 94 | { AF15_34XX_I2C2_SCL, AE15_34XX_I2C2_SDA}, |
| 95 | { AF14_34XX_I2C3_SCL, AG14_34XX_I2C3_SDA}, |
| 96 | }; |
| 97 | #else |
| 98 | static const int omap34xx_pins[][2] = {}; |
| 99 | #endif |
| 100 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 101 | #define OMAP_I2C_CMDLINE_SETUP (BIT(31)) |
| 102 | |
Jarkko Nikula | ad636ad | 2008-12-10 17:36:52 -0800 | [diff] [blame] | 103 | static void __init omap_i2c_mux_pins(int bus) |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 104 | { |
Jarkko Nikula | ad636ad | 2008-12-10 17:36:52 -0800 | [diff] [blame] | 105 | int scl, sda; |
| 106 | |
| 107 | if (cpu_class_is_omap1()) { |
| 108 | scl = I2C_SCL; |
| 109 | sda = I2C_SDA; |
| 110 | } else if (cpu_is_omap24xx()) { |
| 111 | scl = omap24xx_pins[bus][0]; |
| 112 | sda = omap24xx_pins[bus][1]; |
| 113 | } else if (cpu_is_omap34xx()) { |
| 114 | scl = omap34xx_pins[bus][0]; |
| 115 | sda = omap34xx_pins[bus][1]; |
| 116 | } else { |
| 117 | return; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 118 | } |
Jarkko Nikula | ad636ad | 2008-12-10 17:36:52 -0800 | [diff] [blame] | 119 | |
| 120 | omap_cfg_reg(sda); |
| 121 | omap_cfg_reg(scl); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 122 | } |
| 123 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 124 | static int __init omap_i2c_nr_ports(void) |
| 125 | { |
| 126 | int ports = 0; |
| 127 | |
| 128 | if (cpu_class_is_omap1()) |
| 129 | ports = 1; |
| 130 | else if (cpu_is_omap24xx()) |
| 131 | ports = 2; |
| 132 | else if (cpu_is_omap34xx()) |
| 133 | ports = 3; |
| 134 | |
| 135 | return ports; |
| 136 | } |
| 137 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 138 | static int __init omap_i2c_add_bus(int bus_id) |
| 139 | { |
| 140 | struct platform_device *pdev; |
| 141 | struct resource *res; |
| 142 | resource_size_t base, irq; |
| 143 | |
| 144 | pdev = &omap_i2c_devices[bus_id - 1]; |
| 145 | if (bus_id == 1) { |
| 146 | res = pdev->resource; |
| 147 | if (cpu_class_is_omap1()) { |
| 148 | base = OMAP1_I2C_BASE; |
| 149 | irq = INT_I2C; |
| 150 | } else { |
| 151 | base = OMAP2_I2C_BASE1; |
| 152 | irq = INT_24XX_I2C1_IRQ; |
| 153 | } |
| 154 | res[0].start = base; |
| 155 | res[0].end = base + OMAP_I2C_SIZE; |
| 156 | res[1].start = irq; |
| 157 | } |
| 158 | |
| 159 | omap_i2c_mux_pins(bus_id - 1); |
| 160 | return platform_device_register(pdev); |
| 161 | } |
| 162 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 163 | /** |
| 164 | * omap_i2c_bus_setup - Process command line options for the I2C bus speed |
| 165 | * @str: String of options |
| 166 | * |
| 167 | * This function allow to override the default I2C bus speed for given I2C |
| 168 | * bus with a command line option. |
| 169 | * |
| 170 | * Format: i2c_bus=bus_id,clkrate (in kHz) |
| 171 | * |
| 172 | * Returns 1 on success, 0 otherwise. |
| 173 | */ |
| 174 | static int __init omap_i2c_bus_setup(char *str) |
| 175 | { |
| 176 | int ports; |
| 177 | int ints[3]; |
| 178 | |
| 179 | ports = omap_i2c_nr_ports(); |
| 180 | get_options(str, 3, ints); |
| 181 | if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports) |
| 182 | return 0; |
| 183 | i2c_rate[ints[1] - 1] = ints[2]; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 184 | i2c_rate[ints[1] - 1] |= OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 185 | |
| 186 | return 1; |
| 187 | } |
| 188 | __setup("i2c_bus=", omap_i2c_bus_setup); |
| 189 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 190 | /* |
| 191 | * Register busses defined in command line but that are not registered with |
| 192 | * omap_register_i2c_bus from board initialization code. |
| 193 | */ |
| 194 | static int __init omap_register_i2c_bus_cmdline(void) |
| 195 | { |
| 196 | int i, err = 0; |
| 197 | |
| 198 | for (i = 0; i < ARRAY_SIZE(i2c_rate); i++) |
| 199 | if (i2c_rate[i] & OMAP_I2C_CMDLINE_SETUP) { |
| 200 | i2c_rate[i] &= ~OMAP_I2C_CMDLINE_SETUP; |
| 201 | err = omap_i2c_add_bus(i + 1); |
| 202 | if (err) |
| 203 | goto out; |
| 204 | } |
| 205 | |
| 206 | out: |
| 207 | return err; |
| 208 | } |
| 209 | subsys_initcall(omap_register_i2c_bus_cmdline); |
| 210 | |
Jarkko Nikula | d4c58bf | 2009-03-23 18:07:46 -0700 | [diff] [blame] | 211 | /** |
| 212 | * omap_register_i2c_bus - register I2C bus with device descriptors |
| 213 | * @bus_id: bus id counting from number 1 |
| 214 | * @clkrate: clock rate of the bus in kHz |
| 215 | * @info: pointer into I2C device descriptor table or NULL |
| 216 | * @len: number of descriptors in the table |
| 217 | * |
| 218 | * Returns 0 on success or an error code. |
| 219 | */ |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 220 | int __init omap_register_i2c_bus(int bus_id, u32 clkrate, |
| 221 | struct i2c_board_info const *info, |
| 222 | unsigned len) |
| 223 | { |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 224 | int err; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 225 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 226 | BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports()); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 227 | |
| 228 | if (info) { |
| 229 | err = i2c_register_board_info(bus_id, info, len); |
| 230 | if (err) |
| 231 | return err; |
| 232 | } |
| 233 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 234 | if (!i2c_rate[bus_id - 1]) |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 235 | i2c_rate[bus_id - 1] = clkrate; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 236 | i2c_rate[bus_id - 1] &= ~OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 237 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 238 | return omap_i2c_add_bus(bus_id); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 239 | } |