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> |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 29 | #include <linux/slab.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/clk.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 32 | |
Russell King | 80b02c1 | 2009-01-08 10:01:47 +0000 | [diff] [blame] | 33 | #include <mach/irqs.h> |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 34 | #include <plat/i2c.h> |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 35 | #include <plat/omap_device.h> |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 36 | |
| 37 | #define OMAP_I2C_SIZE 0x3f |
| 38 | #define OMAP1_I2C_BASE 0xfffb3800 |
Tony Lindgren | 936e0f2 | 2012-09-04 17:43:29 -0700 | [diff] [blame] | 39 | #define OMAP1_INT_I2C (32 + 4) |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 40 | |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 41 | static const char name[] = "omap_i2c"; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 42 | |
| 43 | #define I2C_RESOURCE_BUILDER(base, irq) \ |
| 44 | { \ |
| 45 | .start = (base), \ |
| 46 | .end = (base) + OMAP_I2C_SIZE, \ |
| 47 | .flags = IORESOURCE_MEM, \ |
| 48 | }, \ |
| 49 | { \ |
| 50 | .start = (irq), \ |
| 51 | .flags = IORESOURCE_IRQ, \ |
| 52 | }, |
| 53 | |
| 54 | static struct resource i2c_resources[][2] = { |
| 55 | { I2C_RESOURCE_BUILDER(0, 0) }, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | #define I2C_DEV_BUILDER(bus_id, res, data) \ |
| 59 | { \ |
| 60 | .id = (bus_id), \ |
| 61 | .name = name, \ |
| 62 | .num_resources = ARRAY_SIZE(res), \ |
| 63 | .resource = (res), \ |
| 64 | .dev = { \ |
| 65 | .platform_data = (data), \ |
| 66 | }, \ |
| 67 | } |
| 68 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 69 | #define MAX_OMAP_I2C_HWMOD_NAME_LEN 16 |
| 70 | #define OMAP_I2C_MAX_CONTROLLERS 4 |
| 71 | 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] | 72 | static struct platform_device omap_i2c_devices[] = { |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 73 | I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]), |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 74 | }; |
| 75 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 76 | #define OMAP_I2C_CMDLINE_SETUP (BIT(31)) |
| 77 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 78 | static int __init omap_i2c_nr_ports(void) |
| 79 | { |
| 80 | int ports = 0; |
| 81 | |
| 82 | if (cpu_class_is_omap1()) |
| 83 | ports = 1; |
| 84 | else if (cpu_is_omap24xx()) |
| 85 | ports = 2; |
| 86 | else if (cpu_is_omap34xx()) |
| 87 | ports = 3; |
Tony Lindgren | 6daa642 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 88 | else if (cpu_is_omap44xx()) |
| 89 | ports = 4; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 90 | |
| 91 | return ports; |
| 92 | } |
| 93 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 94 | static inline int omap1_i2c_add_bus(int bus_id) |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 95 | { |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 96 | struct platform_device *pdev; |
| 97 | struct omap_i2c_bus_platform_data *pdata; |
Paul Walmsley | 00b4ade | 2010-12-07 04:30:57 +0000 | [diff] [blame] | 98 | struct resource *res; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 99 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 100 | omap1_i2c_mux_pins(bus_id); |
| 101 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 102 | pdev = &omap_i2c_devices[bus_id - 1]; |
Paul Walmsley | 00b4ade | 2010-12-07 04:30:57 +0000 | [diff] [blame] | 103 | res = pdev->resource; |
| 104 | res[0].start = OMAP1_I2C_BASE; |
| 105 | res[0].end = res[0].start + OMAP_I2C_SIZE; |
Tony Lindgren | 936e0f2 | 2012-09-04 17:43:29 -0700 | [diff] [blame] | 106 | res[1].start = OMAP1_INT_I2C; |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 107 | pdata = &i2c_pdata[bus_id - 1]; |
| 108 | |
Andy Green | 67b90c6 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 109 | /* all OMAP1 have IP version 1 register set */ |
| 110 | pdata->rev = OMAP_I2C_IP_VERSION_1; |
| 111 | |
Andy Green | 8e286f5 | 2011-05-30 07:43:09 -0700 | [diff] [blame] | 112 | /* all OMAP1 I2C are implemented like this */ |
| 113 | pdata->flags = OMAP_I2C_FLAG_NO_FIFO | |
| 114 | OMAP_I2C_FLAG_SIMPLE_CLOCK | |
| 115 | OMAP_I2C_FLAG_16BIT_DATA_REG | |
| 116 | OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK; |
| 117 | |
| 118 | /* how the cpu bus is wired up differs for 7xx only */ |
| 119 | |
| 120 | if (cpu_is_omap7xx()) |
| 121 | pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1; |
| 122 | else |
| 123 | pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2; |
| 124 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 125 | return platform_device_register(pdev); |
| 126 | } |
| 127 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 128 | |
Felipe Balbi | 790a26f | 2011-01-27 16:39:41 -0800 | [diff] [blame] | 129 | #ifdef CONFIG_ARCH_OMAP2PLUS |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 130 | static inline int omap2_i2c_add_bus(int bus_id) |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 131 | { |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 132 | int l; |
| 133 | struct omap_hwmod *oh; |
Kevin Hilman | 3528c58 | 2011-07-21 13:48:45 -0700 | [diff] [blame] | 134 | struct platform_device *pdev; |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 135 | char oh_name[MAX_OMAP_I2C_HWMOD_NAME_LEN]; |
| 136 | struct omap_i2c_bus_platform_data *pdata; |
Andy Green | 029a1e7 | 2011-05-30 07:43:08 -0700 | [diff] [blame] | 137 | struct omap_i2c_dev_attr *dev_attr; |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 138 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 139 | omap2_i2c_mux_pins(bus_id); |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 140 | |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 141 | l = snprintf(oh_name, MAX_OMAP_I2C_HWMOD_NAME_LEN, "i2c%d", bus_id); |
| 142 | WARN(l >= MAX_OMAP_I2C_HWMOD_NAME_LEN, |
| 143 | "String buffer overflow in I2C%d device setup\n", bus_id); |
| 144 | oh = omap_hwmod_lookup(oh_name); |
| 145 | if (!oh) { |
| 146 | pr_err("Could not look up %s\n", oh_name); |
| 147 | return -EEXIST; |
| 148 | } |
| 149 | |
| 150 | pdata = &i2c_pdata[bus_id - 1]; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 151 | /* |
Andy Green | d177e5d | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 152 | * 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] | 153 | * use, and functionality implementation flags, up to the OMAP I2C |
| 154 | * driver via platform data |
Andy Green | d177e5d | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 155 | */ |
| 156 | pdata->rev = oh->class->rev; |
| 157 | |
Andy Green | 029a1e7 | 2011-05-30 07:43:08 -0700 | [diff] [blame] | 158 | dev_attr = (struct omap_i2c_dev_attr *)oh->dev_attr; |
| 159 | pdata->flags = dev_attr->flags; |
| 160 | |
Kevin Hilman | 3528c58 | 2011-07-21 13:48:45 -0700 | [diff] [blame] | 161 | pdev = omap_device_build(name, bus_id, oh, pdata, |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 162 | sizeof(struct omap_i2c_bus_platform_data), |
Benoit Cousson | f718e2c | 2011-08-10 15:30:09 +0200 | [diff] [blame] | 163 | NULL, 0, 0); |
Kevin Hilman | 3528c58 | 2011-07-21 13:48:45 -0700 | [diff] [blame] | 164 | WARN(IS_ERR(pdev), "Could not build omap_device for %s\n", name); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 165 | |
Laurent Pinchart | af504e5 | 2011-11-02 12:54:03 +0100 | [diff] [blame] | 166 | return PTR_RET(pdev); |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 167 | } |
Tony Lindgren | be40f7a | 2010-12-07 16:25:40 -0800 | [diff] [blame] | 168 | #else |
| 169 | static inline int omap2_i2c_add_bus(int bus_id) |
| 170 | { |
| 171 | return 0; |
| 172 | } |
| 173 | #endif |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 174 | |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 175 | static int __init omap_i2c_add_bus(int bus_id) |
| 176 | { |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 177 | if (cpu_class_is_omap1()) |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 178 | return omap1_i2c_add_bus(bus_id); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 179 | else |
Paul Walmsley | 4d17aeb | 2010-09-21 19:37:15 +0530 | [diff] [blame] | 180 | return omap2_i2c_add_bus(bus_id); |
Tony Lindgren | b32dd41 | 2010-05-20 11:36:43 -0700 | [diff] [blame] | 181 | } |
| 182 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 183 | /** |
| 184 | * omap_i2c_bus_setup - Process command line options for the I2C bus speed |
| 185 | * @str: String of options |
| 186 | * |
| 187 | * This function allow to override the default I2C bus speed for given I2C |
| 188 | * bus with a command line option. |
| 189 | * |
| 190 | * Format: i2c_bus=bus_id,clkrate (in kHz) |
| 191 | * |
| 192 | * Returns 1 on success, 0 otherwise. |
| 193 | */ |
| 194 | static int __init omap_i2c_bus_setup(char *str) |
| 195 | { |
| 196 | int ports; |
| 197 | int ints[3]; |
| 198 | |
| 199 | ports = omap_i2c_nr_ports(); |
| 200 | get_options(str, 3, ints); |
| 201 | if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports) |
| 202 | return 0; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 203 | i2c_pdata[ints[1] - 1].clkrate = ints[2]; |
| 204 | i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 205 | |
| 206 | return 1; |
| 207 | } |
| 208 | __setup("i2c_bus=", omap_i2c_bus_setup); |
| 209 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 210 | /* |
| 211 | * Register busses defined in command line but that are not registered with |
| 212 | * omap_register_i2c_bus from board initialization code. |
| 213 | */ |
| 214 | static int __init omap_register_i2c_bus_cmdline(void) |
| 215 | { |
| 216 | int i, err = 0; |
| 217 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 218 | for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++) |
| 219 | if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) { |
| 220 | i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 221 | err = omap_i2c_add_bus(i + 1); |
| 222 | if (err) |
| 223 | goto out; |
| 224 | } |
| 225 | |
| 226 | out: |
| 227 | return err; |
| 228 | } |
| 229 | subsys_initcall(omap_register_i2c_bus_cmdline); |
| 230 | |
Jarkko Nikula | d4c58bf | 2009-03-23 18:07:46 -0700 | [diff] [blame] | 231 | /** |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 232 | * omap_register_i2c_bus - register I2C bus with device descriptors |
Jarkko Nikula | d4c58bf | 2009-03-23 18:07:46 -0700 | [diff] [blame] | 233 | * @bus_id: bus id counting from number 1 |
| 234 | * @clkrate: clock rate of the bus in kHz |
| 235 | * @info: pointer into I2C device descriptor table or NULL |
| 236 | * @len: number of descriptors in the table |
| 237 | * |
| 238 | * Returns 0 on success or an error code. |
| 239 | */ |
Jarkko Nikula | 9833eff | 2010-02-22 20:29:36 +0000 | [diff] [blame] | 240 | int __init omap_register_i2c_bus(int bus_id, u32 clkrate, |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 241 | struct i2c_board_info const *info, |
| 242 | unsigned len) |
| 243 | { |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 244 | int err; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 245 | |
Jarkko Nikula | 3a853fb | 2009-03-23 18:07:47 -0700 | [diff] [blame] | 246 | BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports()); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 247 | |
| 248 | if (info) { |
| 249 | err = i2c_register_board_info(bus_id, info, len); |
| 250 | if (err) |
| 251 | return err; |
| 252 | } |
| 253 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 254 | if (!i2c_pdata[bus_id - 1].clkrate) |
| 255 | i2c_pdata[bus_id - 1].clkrate = clkrate; |
| 256 | |
| 257 | i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP; |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 258 | |
Jarkko Nikula | 7954763 | 2009-03-23 18:07:48 -0700 | [diff] [blame] | 259 | return omap_i2c_add_bus(bus_id); |
Jarkko Nikula | 85d05fb | 2007-11-07 06:54:31 +0200 | [diff] [blame] | 260 | } |