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> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 29 | #include <linux/i2c-omap.h> |
| 30 | |
Russell King | 80b02c1 | 2009-01-08 10:01:47 +0000 | [diff] [blame] | 31 | #include <mach/irqs.h> |
Tony Lindgren | ce491cf | 2009-10-20 09:40:47 -0700 | [diff] [blame] | 32 | #include <plat/mux.h> |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 33 | #include <plat/i2c.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 34 | #include <plat/omap-pm.h> |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 35 | |
| 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 |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 41 | #define OMAP4_I2C_BASE4 0x48350000 |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 42 | |
| 43 | static const char name[] = "i2c_omap"; |
| 44 | |
| 45 | #define I2C_RESOURCE_BUILDER(base, irq) \ |
| 46 | { \ |
| 47 | .start = (base), \ |
| 48 | .end = (base) + OMAP_I2C_SIZE, \ |
| 49 | .flags = IORESOURCE_MEM, \ |
| 50 | }, \ |
| 51 | { \ |
| 52 | .start = (irq), \ |
| 53 | .flags = IORESOURCE_IRQ, \ |
| 54 | }, |
| 55 | |
| 56 | static struct resource i2c_resources[][2] = { |
| 57 | { I2C_RESOURCE_BUILDER(0, 0) }, |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 58 | #if defined(CONFIG_ARCH_OMAP2PLUS) |
| 59 | { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE2, 0) }, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 60 | #endif |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 61 | #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4) |
| 62 | { I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, 0) }, |
| 63 | #endif |
| 64 | #if defined(CONFIG_ARCH_OMAP4) |
| 65 | { I2C_RESOURCE_BUILDER(OMAP4_I2C_BASE4, 0) }, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 66 | #endif |
| 67 | }; |
| 68 | |
| 69 | #define I2C_DEV_BUILDER(bus_id, res, data) \ |
| 70 | { \ |
| 71 | .id = (bus_id), \ |
| 72 | .name = name, \ |
| 73 | .num_resources = ARRAY_SIZE(res), \ |
| 74 | .resource = (res), \ |
| 75 | .dev = { \ |
| 76 | .platform_data = (data), \ |
| 77 | }, \ |
| 78 | } |
| 79 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 80 | static struct omap_i2c_bus_platform_data i2c_pdata[ARRAY_SIZE(i2c_resources)]; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 81 | static struct platform_device omap_i2c_devices[] = { |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 82 | I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]), |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 83 | #if defined(CONFIG_ARCH_OMAP2PLUS) |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 84 | I2C_DEV_BUILDER(2, i2c_resources[1], &i2c_pdata[1]), |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 85 | #endif |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 86 | #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4) |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 87 | I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_pdata[2]), |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 88 | #endif |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 89 | #if defined(CONFIG_ARCH_OMAP4) |
| 90 | I2C_DEV_BUILDER(4, i2c_resources[3], &i2c_pdata[3]), |
| 91 | #endif |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 92 | }; |
| 93 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 94 | #define OMAP_I2C_CMDLINE_SETUP (BIT(31)) |
| 95 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 96 | static int __init omap_i2c_nr_ports(void) |
| 97 | { |
| 98 | int ports = 0; |
| 99 | |
| 100 | if (cpu_class_is_omap1()) |
| 101 | ports = 1; |
| 102 | else if (cpu_is_omap24xx()) |
| 103 | ports = 2; |
| 104 | else if (cpu_is_omap34xx()) |
| 105 | ports = 3; |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 106 | else if (cpu_is_omap44xx()) |
| 107 | ports = 4; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 108 | |
| 109 | return ports; |
| 110 | } |
| 111 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 112 | /* Shared between omap2 and 3 */ |
| 113 | static resource_size_t omap2_i2c_irq[3] __initdata = { |
| 114 | INT_24XX_I2C1_IRQ, |
| 115 | INT_24XX_I2C2_IRQ, |
| 116 | INT_34XX_I2C3_IRQ, |
| 117 | }; |
| 118 | |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 119 | static resource_size_t omap4_i2c_irq[4] __initdata = { |
| 120 | OMAP44XX_IRQ_I2C1, |
| 121 | OMAP44XX_IRQ_I2C2, |
| 122 | OMAP44XX_IRQ_I2C3, |
| 123 | OMAP44XX_IRQ_I2C4, |
| 124 | }; |
| 125 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 126 | static inline int omap1_i2c_add_bus(struct platform_device *pdev, int bus_id) |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 127 | { |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 128 | struct omap_i2c_bus_platform_data *pd; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 129 | struct resource *res; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 130 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 131 | pd = pdev->dev.platform_data; |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 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); |
| 137 | |
| 138 | return platform_device_register(pdev); |
| 139 | } |
| 140 | |
Paul Walmsley | 564889c | 2010-07-26 16:34:34 -0600 | [diff] [blame^] | 141 | /* |
| 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. |
| 145 | */ |
| 146 | static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t) |
| 147 | { |
| 148 | omap_pm_set_max_mpu_wakeup_lat(dev, t); |
| 149 | } |
| 150 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 151 | static inline int omap2_i2c_add_bus(struct platform_device *pdev, int bus_id) |
| 152 | { |
| 153 | struct resource *res; |
| 154 | resource_size_t *irq; |
| 155 | |
| 156 | res = pdev->resource; |
| 157 | |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 158 | if (!cpu_is_omap44xx()) |
| 159 | irq = omap2_i2c_irq; |
| 160 | else |
| 161 | irq = omap4_i2c_irq; |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 162 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 163 | if (bus_id == 1) { |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 164 | res[0].start = OMAP2_I2C_BASE1; |
| 165 | res[0].end = res[0].start + OMAP_I2C_SIZE; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 168 | res[1].start = irq[bus_id - 1]; |
| 169 | omap2_i2c_mux_pins(bus_id); |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 170 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 171 | /* |
| 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 |
| 175 | * completes. |
| 176 | */ |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 177 | if (cpu_is_omap34xx()) { |
| 178 | struct omap_i2c_bus_platform_data *pd; |
| 179 | |
| 180 | pd = pdev->dev.platform_data; |
Paul Walmsley | 564889c | 2010-07-26 16:34:34 -0600 | [diff] [blame^] | 181 | pd->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat; |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 182 | } |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 183 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 184 | return platform_device_register(pdev); |
| 185 | } |
| 186 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 187 | static int __init omap_i2c_add_bus(int bus_id) |
| 188 | { |
| 189 | struct platform_device *pdev; |
| 190 | |
| 191 | pdev = &omap_i2c_devices[bus_id - 1]; |
| 192 | |
| 193 | if (cpu_class_is_omap1()) |
| 194 | return omap1_i2c_add_bus(pdev, bus_id); |
| 195 | else |
| 196 | return omap2_i2c_add_bus(pdev, bus_id); |
| 197 | } |
| 198 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 199 | /** |
| 200 | * omap_i2c_bus_setup - Process command line options for the I2C bus speed |
| 201 | * @str: String of options |
| 202 | * |
| 203 | * This function allow to override the default I2C bus speed for given I2C |
| 204 | * bus with a command line option. |
| 205 | * |
| 206 | * Format: i2c_bus=bus_id,clkrate (in kHz) |
| 207 | * |
| 208 | * Returns 1 on success, 0 otherwise. |
| 209 | */ |
| 210 | static int __init omap_i2c_bus_setup(char *str) |
| 211 | { |
| 212 | int ports; |
| 213 | int ints[3]; |
| 214 | |
| 215 | ports = omap_i2c_nr_ports(); |
| 216 | get_options(str, 3, ints); |
| 217 | if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports) |
| 218 | return 0; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 219 | i2c_pdata[ints[1] - 1].clkrate = ints[2]; |
| 220 | i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 221 | |
| 222 | return 1; |
| 223 | } |
| 224 | __setup("i2c_bus=", omap_i2c_bus_setup); |
| 225 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 226 | /* |
| 227 | * Register busses defined in command line but that are not registered with |
| 228 | * omap_register_i2c_bus from board initialization code. |
| 229 | */ |
| 230 | static int __init omap_register_i2c_bus_cmdline(void) |
| 231 | { |
| 232 | int i, err = 0; |
| 233 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 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; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 237 | err = omap_i2c_add_bus(i + 1); |
| 238 | if (err) |
| 239 | goto out; |
| 240 | } |
| 241 | |
| 242 | out: |
| 243 | return err; |
| 244 | } |
| 245 | subsys_initcall(omap_register_i2c_bus_cmdline); |
| 246 | |
Jarkko Nikula | d4c58bf | 2009-03-23 18:07:46 -0700 | [diff] [blame] | 247 | /** |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 248 | * omap_register_i2c_bus - register I2C bus with device descriptors |
Jarkko Nikula | d4c58bf | 2009-03-23 18:07:46 -0700 | [diff] [blame] | 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 |
| 253 | * |
| 254 | * Returns 0 on success or an error code. |
| 255 | */ |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 256 | int __init omap_register_i2c_bus(int bus_id, u32 clkrate, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 257 | struct i2c_board_info const *info, |
| 258 | unsigned len) |
| 259 | { |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 260 | int err; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 261 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 262 | BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports()); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 263 | |
| 264 | if (info) { |
| 265 | err = i2c_register_board_info(bus_id, info, len); |
| 266 | if (err) |
| 267 | return err; |
| 268 | } |
| 269 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 270 | if (!i2c_pdata[bus_id - 1].clkrate) |
| 271 | i2c_pdata[bus_id - 1].clkrate = clkrate; |
| 272 | |
| 273 | i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 274 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 275 | return omap_i2c_add_bus(bus_id); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 276 | } |