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> |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 30 | #include <linux/slab.h> |
| 31 | #include <linux/err.h> |
| 32 | #include <linux/clk.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 33 | |
Russell King | 80b02c1 | 2009-01-08 10:01:47 +0000 | [diff] [blame] | 34 | #include <mach/irqs.h> |
Tony Lindgren | ce491cf | 2009-10-20 09:40:47 -0700 | [diff] [blame] | 35 | #include <plat/mux.h> |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 36 | #include <plat/i2c.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 37 | #include <plat/omap-pm.h> |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 38 | #include <plat/omap_device.h> |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 39 | |
| 40 | #define OMAP_I2C_SIZE 0x3f |
| 41 | #define OMAP1_I2C_BASE 0xfffb3800 |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 42 | |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 43 | static const char name[] = "omap_i2c"; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 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) }, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | #define I2C_DEV_BUILDER(bus_id, res, data) \ |
| 61 | { \ |
| 62 | .id = (bus_id), \ |
| 63 | .name = name, \ |
| 64 | .num_resources = ARRAY_SIZE(res), \ |
| 65 | .resource = (res), \ |
| 66 | .dev = { \ |
| 67 | .platform_data = (data), \ |
| 68 | }, \ |
| 69 | } |
| 70 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 71 | #define MAX_OMAP_I2C_HWMOD_NAME_LEN 16 |
| 72 | #define OMAP_I2C_MAX_CONTROLLERS 4 |
| 73 | static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS]; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 74 | static struct platform_device omap_i2c_devices[] = { |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 75 | I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]), |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 76 | }; |
| 77 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 78 | #define OMAP_I2C_CMDLINE_SETUP (BIT(31)) |
| 79 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 80 | static int __init omap_i2c_nr_ports(void) |
| 81 | { |
| 82 | int ports = 0; |
| 83 | |
| 84 | if (cpu_class_is_omap1()) |
| 85 | ports = 1; |
| 86 | else if (cpu_is_omap24xx()) |
| 87 | ports = 2; |
| 88 | else if (cpu_is_omap34xx()) |
| 89 | ports = 3; |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 90 | else if (cpu_is_omap44xx()) |
| 91 | ports = 4; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 92 | |
| 93 | return ports; |
| 94 | } |
| 95 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 96 | static inline int omap1_i2c_add_bus(int bus_id) |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 97 | { |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 98 | struct platform_device *pdev; |
| 99 | struct omap_i2c_bus_platform_data *pdata; |
Paul Walmsley | 00b4ade | 2010-12-07 04:30:57 +0000 | [diff] [blame] | 100 | struct resource *res; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 101 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 102 | omap1_i2c_mux_pins(bus_id); |
| 103 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 104 | pdev = &omap_i2c_devices[bus_id - 1]; |
Paul Walmsley | 00b4ade | 2010-12-07 04:30:57 +0000 | [diff] [blame] | 105 | res = pdev->resource; |
| 106 | res[0].start = OMAP1_I2C_BASE; |
| 107 | res[0].end = res[0].start + OMAP_I2C_SIZE; |
| 108 | res[1].start = INT_I2C; |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 109 | pdata = &i2c_pdata[bus_id - 1]; |
| 110 | |
Andy Green | 67b90c6 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 111 | /* all OMAP1 have IP version 1 register set */ |
| 112 | pdata->rev = OMAP_I2C_IP_VERSION_1; |
| 113 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 114 | return platform_device_register(pdev); |
| 115 | } |
| 116 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 117 | |
Felipe Balbi | 790a26f | 2011-01-27 16:39:41 -0800 | [diff] [blame] | 118 | #ifdef CONFIG_ARCH_OMAP2PLUS |
Paul Walmsley | 564889c | 2010-07-26 16:34:34 -0600 | [diff] [blame] | 119 | /* |
| 120 | * XXX This function is a temporary compatibility wrapper - only |
| 121 | * needed until the I2C driver can be converted to call |
| 122 | * omap_pm_set_max_dev_wakeup_lat() and handle a return code. |
| 123 | */ |
| 124 | static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t) |
| 125 | { |
| 126 | omap_pm_set_max_mpu_wakeup_lat(dev, t); |
| 127 | } |
| 128 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 129 | static struct omap_device_pm_latency omap_i2c_latency[] = { |
| 130 | [0] = { |
| 131 | .deactivate_func = omap_device_idle_hwmods, |
| 132 | .activate_func = omap_device_enable_hwmods, |
| 133 | .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST, |
| 134 | }, |
| 135 | }; |
| 136 | |
| 137 | static inline int omap2_i2c_add_bus(int bus_id) |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 138 | { |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 139 | int l; |
| 140 | struct omap_hwmod *oh; |
| 141 | struct omap_device *od; |
| 142 | char oh_name[MAX_OMAP_I2C_HWMOD_NAME_LEN]; |
| 143 | struct omap_i2c_bus_platform_data *pdata; |
Andy Green | 029a1e7 | 2011-05-30 07:43:08 -0700 | [diff] [blame^] | 144 | struct omap_i2c_dev_attr *dev_attr; |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 145 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 146 | omap2_i2c_mux_pins(bus_id); |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 147 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 148 | l = snprintf(oh_name, MAX_OMAP_I2C_HWMOD_NAME_LEN, "i2c%d", bus_id); |
| 149 | WARN(l >= MAX_OMAP_I2C_HWMOD_NAME_LEN, |
| 150 | "String buffer overflow in I2C%d device setup\n", bus_id); |
| 151 | oh = omap_hwmod_lookup(oh_name); |
| 152 | if (!oh) { |
| 153 | pr_err("Could not look up %s\n", oh_name); |
| 154 | return -EEXIST; |
| 155 | } |
| 156 | |
| 157 | pdata = &i2c_pdata[bus_id - 1]; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 158 | /* |
Andy Green | d177e5d | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 159 | * pass the hwmod class's CPU-specific knowledge of I2C IP revision in |
Andy Green | 029a1e7 | 2011-05-30 07:43:08 -0700 | [diff] [blame^] | 160 | * use, and functionality implementation flags, up to the OMAP I2C |
| 161 | * driver via platform data |
Andy Green | d177e5d | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 162 | */ |
| 163 | pdata->rev = oh->class->rev; |
| 164 | |
Andy Green | 029a1e7 | 2011-05-30 07:43:08 -0700 | [diff] [blame^] | 165 | dev_attr = (struct omap_i2c_dev_attr *)oh->dev_attr; |
| 166 | pdata->flags = dev_attr->flags; |
| 167 | |
Andy Green | d177e5d | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 168 | /* |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 169 | * When waiting for completion of a i2c transfer, we need to |
| 170 | * set a wake up latency constraint for the MPU. This is to |
| 171 | * ensure quick enough wakeup from idle, when transfer |
| 172 | * completes. |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 173 | * Only omap3 has support for constraints |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 174 | */ |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 175 | if (cpu_is_omap34xx()) |
| 176 | pdata->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat; |
| 177 | od = omap_device_build(name, bus_id, oh, pdata, |
| 178 | sizeof(struct omap_i2c_bus_platform_data), |
| 179 | omap_i2c_latency, ARRAY_SIZE(omap_i2c_latency), 0); |
| 180 | WARN(IS_ERR(od), "Could not build omap_device for %s\n", name); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 181 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 182 | return PTR_ERR(od); |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 183 | } |
Tony Lindgren | be40f7a | 2010-12-07 16:25:40 -0800 | [diff] [blame] | 184 | #else |
| 185 | static inline int omap2_i2c_add_bus(int bus_id) |
| 186 | { |
| 187 | return 0; |
| 188 | } |
| 189 | #endif |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 190 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 191 | static int __init omap_i2c_add_bus(int bus_id) |
| 192 | { |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 193 | if (cpu_class_is_omap1()) |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 194 | return omap1_i2c_add_bus(bus_id); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 195 | else |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 196 | return omap2_i2c_add_bus(bus_id); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 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 | } |