Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Synopsys DesignWare I2C adapter driver (master only). |
| 3 | * |
| 4 | * Based on the TI DAVINCI I2C adapter driver. |
| 5 | * |
| 6 | * Copyright (C) 2006 Texas Instruments. |
| 7 | * Copyright (C) 2007 MontaVista Software Inc. |
| 8 | * Copyright (C) 2009 Provigent Ltd. |
| 9 | * |
| 10 | * ---------------------------------------------------------------------------- |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 21 | * ---------------------------------------------------------------------------- |
| 22 | * |
| 23 | */ |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/delay.h> |
Mika Westerberg | 56d4b8a | 2015-09-24 12:06:54 +0300 | [diff] [blame] | 27 | #include <linux/dmi.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 28 | #include <linux/i2c.h> |
| 29 | #include <linux/clk.h> |
Carl Peng | a445900 | 2014-09-30 13:04:55 +0300 | [diff] [blame] | 30 | #include <linux/clk-provider.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 31 | #include <linux/errno.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/err.h> |
| 34 | #include <linux/interrupt.h> |
Christian Ruppert | 9803f86 | 2013-06-26 10:55:06 +0200 | [diff] [blame] | 35 | #include <linux/of.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 36 | #include <linux/platform_device.h> |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 37 | #include <linux/pm.h> |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 38 | #include <linux/pm_runtime.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 39 | #include <linux/io.h> |
| 40 | #include <linux/slab.h> |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 41 | #include <linux/acpi.h> |
Tan, Raymond | 4bcfda0 | 2014-09-03 10:41:38 +0800 | [diff] [blame] | 42 | #include <linux/platform_data/i2c-designware.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 43 | #include "i2c-designware-core.h" |
| 44 | |
Dirk Brandewie | 1d31b58 | 2011-10-06 11:26:30 -0700 | [diff] [blame] | 45 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
| 46 | { |
| 47 | return clk_get_rate(dev->clk)/1000; |
| 48 | } |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 49 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 50 | #ifdef CONFIG_ACPI |
Mika Westerberg | 56d4b8a | 2015-09-24 12:06:54 +0300 | [diff] [blame] | 51 | /* |
| 52 | * The HCNT/LCNT information coming from ACPI should be the most accurate |
| 53 | * for given platform. However, some systems get it wrong. On such systems |
| 54 | * we get better results by calculating those based on the input clock. |
| 55 | */ |
| 56 | static const struct dmi_system_id dw_i2c_no_acpi_params[] = { |
| 57 | { |
| 58 | .ident = "Dell Inspiron 7348", |
| 59 | .matches = { |
| 60 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 61 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"), |
| 62 | }, |
| 63 | }, |
| 64 | { } |
| 65 | }; |
| 66 | |
Mika Westerberg | 57cd1e3 | 2013-08-19 15:07:54 +0300 | [diff] [blame] | 67 | static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], |
| 68 | u16 *hcnt, u16 *lcnt, u32 *sda_hold) |
| 69 | { |
| 70 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; |
| 71 | acpi_handle handle = ACPI_HANDLE(&pdev->dev); |
| 72 | union acpi_object *obj; |
| 73 | |
Mika Westerberg | 56d4b8a | 2015-09-24 12:06:54 +0300 | [diff] [blame] | 74 | if (dmi_check_system(dw_i2c_no_acpi_params)) |
| 75 | return; |
| 76 | |
Mika Westerberg | 57cd1e3 | 2013-08-19 15:07:54 +0300 | [diff] [blame] | 77 | if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) |
| 78 | return; |
| 79 | |
| 80 | obj = (union acpi_object *)buf.pointer; |
| 81 | if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { |
| 82 | const union acpi_object *objs = obj->package.elements; |
| 83 | |
| 84 | *hcnt = (u16)objs[0].integer.value; |
| 85 | *lcnt = (u16)objs[1].integer.value; |
| 86 | if (sda_hold) |
| 87 | *sda_hold = (u32)objs[2].integer.value; |
| 88 | } |
| 89 | |
| 90 | kfree(buf.pointer); |
| 91 | } |
| 92 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 93 | static int dw_i2c_acpi_configure(struct platform_device *pdev) |
| 94 | { |
| 95 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 96 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 97 | dev->adapter.nr = -1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 98 | dev->tx_fifo_depth = 32; |
| 99 | dev->rx_fifo_depth = 32; |
Mika Westerberg | 57cd1e3 | 2013-08-19 15:07:54 +0300 | [diff] [blame] | 100 | |
| 101 | /* |
| 102 | * Try to get SDA hold time and *CNT values from an ACPI method if |
| 103 | * it exists for both supported speed modes. |
| 104 | */ |
Mika Westerberg | 0b26c84 | 2014-09-30 13:04:53 +0300 | [diff] [blame] | 105 | dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL); |
Mika Westerberg | 57cd1e3 | 2013-08-19 15:07:54 +0300 | [diff] [blame] | 106 | dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, |
Mika Westerberg | 0b26c84 | 2014-09-30 13:04:53 +0300 | [diff] [blame] | 107 | &dev->sda_hold_time); |
Mika Westerberg | 57cd1e3 | 2013-08-19 15:07:54 +0300 | [diff] [blame] | 108 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static const struct acpi_device_id dw_i2c_acpi_match[] = { |
| 113 | { "INT33C2", 0 }, |
| 114 | { "INT33C3", 0 }, |
Mika Westerberg | 25b3dfc | 2013-11-12 11:57:30 +0200 | [diff] [blame] | 115 | { "INT3432", 0 }, |
| 116 | { "INT3433", 0 }, |
Mika Westerberg | 5a7e6bd | 2013-05-13 00:54:31 +0000 | [diff] [blame] | 117 | { "80860F41", 0 }, |
Alan Cox | 0409516 | 2014-07-23 13:06:57 +0100 | [diff] [blame] | 118 | { "808622C1", 0 }, |
Ken Xue | 3eddad9 | 2015-10-23 13:28:47 +0800 | [diff] [blame] | 119 | { "AMD0010", 0 }, |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 120 | { } |
| 121 | }; |
| 122 | MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); |
| 123 | #else |
| 124 | static inline int dw_i2c_acpi_configure(struct platform_device *pdev) |
| 125 | { |
| 126 | return -ENODEV; |
| 127 | } |
| 128 | #endif |
| 129 | |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 130 | static int dw_i2c_plat_probe(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 131 | { |
| 132 | struct dw_i2c_dev *dev; |
| 133 | struct i2c_adapter *adap; |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 134 | struct resource *mem; |
Tan, Raymond | 4bcfda0 | 2014-09-03 10:41:38 +0800 | [diff] [blame] | 135 | struct dw_i2c_platform_data *pdata; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 136 | int irq, r; |
Mika Westerberg | 925ddb2 | 2014-09-30 13:04:54 +0300 | [diff] [blame] | 137 | u32 clk_freq, ht = 0; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 138 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 139 | irq = platform_get_irq(pdev, 0); |
Alexey Brodkin | b20d386 | 2015-03-09 12:03:12 +0300 | [diff] [blame] | 140 | if (irq < 0) |
| 141 | return irq; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 142 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 143 | dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); |
| 144 | if (!dev) |
| 145 | return -ENOMEM; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 146 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 147 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 148 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
| 149 | if (IS_ERR(dev->base)) |
| 150 | return PTR_ERR(dev->base); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 151 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 152 | dev->dev = &pdev->dev; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 153 | dev->irq = irq; |
| 154 | platform_set_drvdata(pdev, dev); |
| 155 | |
Romain Baeriswyl | 8e5f6b2 | 2014-08-20 16:29:08 +0200 | [diff] [blame] | 156 | /* fast mode by default because of legacy reasons */ |
| 157 | clk_freq = 400000; |
| 158 | |
Rafael J. Wysocki | ca5b74d | 2015-03-16 23:49:08 +0100 | [diff] [blame] | 159 | if (has_acpi_companion(&pdev->dev)) { |
Mika Westerberg | 925ddb2 | 2014-09-30 13:04:54 +0300 | [diff] [blame] | 160 | dw_i2c_acpi_configure(pdev); |
| 161 | } else if (pdev->dev.of_node) { |
Christian Ruppert | 9803f86 | 2013-06-26 10:55:06 +0200 | [diff] [blame] | 162 | of_property_read_u32(pdev->dev.of_node, |
| 163 | "i2c-sda-hold-time-ns", &ht); |
Romain Baeriswyl | 6468276 | 2014-01-20 17:43:43 +0100 | [diff] [blame] | 164 | |
| 165 | of_property_read_u32(pdev->dev.of_node, |
| 166 | "i2c-sda-falling-time-ns", |
| 167 | &dev->sda_falling_time); |
| 168 | of_property_read_u32(pdev->dev.of_node, |
| 169 | "i2c-scl-falling-time-ns", |
| 170 | &dev->scl_falling_time); |
Romain Baeriswyl | 8e5f6b2 | 2014-08-20 16:29:08 +0200 | [diff] [blame] | 171 | |
| 172 | of_property_read_u32(pdev->dev.of_node, "clock-frequency", |
| 173 | &clk_freq); |
| 174 | |
| 175 | /* Only standard mode at 100kHz and fast mode at 400kHz |
| 176 | * are supported. |
| 177 | */ |
| 178 | if (clk_freq != 100000 && clk_freq != 400000) { |
| 179 | dev_err(&pdev->dev, "Only 100kHz and 400kHz supported"); |
| 180 | return -EINVAL; |
| 181 | } |
Tan, Raymond | 4bcfda0 | 2014-09-03 10:41:38 +0800 | [diff] [blame] | 182 | } else { |
| 183 | pdata = dev_get_platdata(&pdev->dev); |
| 184 | if (pdata) |
| 185 | clk_freq = pdata->i2c_scl_freq; |
Christian Ruppert | 9803f86 | 2013-06-26 10:55:06 +0200 | [diff] [blame] | 186 | } |
| 187 | |
David Box | 894acb2 | 2015-01-15 01:12:17 -0800 | [diff] [blame] | 188 | r = i2c_dw_eval_lock_support(dev); |
| 189 | if (r) |
| 190 | return r; |
| 191 | |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 192 | dev->functionality = |
| 193 | I2C_FUNC_I2C | |
| 194 | I2C_FUNC_10BIT_ADDR | |
| 195 | I2C_FUNC_SMBUS_BYTE | |
| 196 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 197 | I2C_FUNC_SMBUS_WORD_DATA | |
| 198 | I2C_FUNC_SMBUS_I2C_BLOCK; |
Romain Baeriswyl | 8e5f6b2 | 2014-08-20 16:29:08 +0200 | [diff] [blame] | 199 | if (clk_freq == 100000) |
| 200 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
| 201 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD; |
| 202 | else |
| 203 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
| 204 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 205 | |
Mika Westerberg | 925ddb2 | 2014-09-30 13:04:54 +0300 | [diff] [blame] | 206 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
| 207 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
| 208 | if (IS_ERR(dev->clk)) |
| 209 | return PTR_ERR(dev->clk); |
| 210 | clk_prepare_enable(dev->clk); |
| 211 | |
| 212 | if (!dev->sda_hold_time && ht) { |
| 213 | u32 ic_clk = dev->get_clk_rate_khz(dev); |
| 214 | |
| 215 | dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, |
| 216 | 1000000); |
| 217 | } |
| 218 | |
| 219 | if (!dev->tx_fifo_depth) { |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 220 | u32 param1 = i2c_dw_read_comp_param(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 221 | |
| 222 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; |
| 223 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 224 | dev->adapter.nr = pdev->id; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 225 | } |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 226 | |
| 227 | adap = &dev->adapter; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 228 | adap->owner = THIS_MODULE; |
Wolfram Sang | 70fba83 | 2014-07-10 13:46:26 +0200 | [diff] [blame] | 229 | adap->class = I2C_CLASS_DEPRECATED; |
Dustin Byford | 8eb5c87 | 2015-10-23 12:27:07 -0700 | [diff] [blame] | 230 | ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 231 | adap->dev.of_node = pdev->dev.of_node; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 232 | |
David Box | 894acb2 | 2015-01-15 01:12:17 -0800 | [diff] [blame] | 233 | if (dev->pm_runtime_disabled) { |
| 234 | pm_runtime_forbid(&pdev->dev); |
| 235 | } else { |
| 236 | pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); |
| 237 | pm_runtime_use_autosuspend(&pdev->dev); |
| 238 | pm_runtime_set_active(&pdev->dev); |
| 239 | pm_runtime_enable(&pdev->dev); |
| 240 | } |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 241 | |
Linus Torvalds | d55fc37 | 2015-11-10 11:58:25 -0800 | [diff] [blame] | 242 | r = i2c_dw_probe(dev); |
Wolfram Sang | 36d48fb | 2015-10-09 10:39:24 +0100 | [diff] [blame] | 243 | if (r) { |
Wolfram Sang | 36d48fb | 2015-10-09 10:39:24 +0100 | [diff] [blame] | 244 | pm_runtime_disable(&pdev->dev); |
| 245 | return r; |
| 246 | } |
| 247 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 248 | return 0; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 249 | } |
| 250 | |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 251 | static int dw_i2c_plat_remove(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 252 | { |
| 253 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 254 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 255 | pm_runtime_get_sync(&pdev->dev); |
| 256 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 257 | i2c_del_adapter(&dev->adapter); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 258 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 259 | i2c_dw_disable(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 260 | |
Mika Westerberg | edfc390 | 2015-06-17 12:08:38 +0300 | [diff] [blame] | 261 | pm_runtime_dont_use_autosuspend(&pdev->dev); |
| 262 | pm_runtime_put_sync(&pdev->dev); |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 263 | pm_runtime_disable(&pdev->dev); |
| 264 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 265 | return 0; |
| 266 | } |
| 267 | |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 268 | #ifdef CONFIG_OF |
| 269 | static const struct of_device_id dw_i2c_of_match[] = { |
| 270 | { .compatible = "snps,designware-i2c", }, |
| 271 | {}, |
| 272 | }; |
| 273 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); |
| 274 | #endif |
| 275 | |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 276 | #ifdef CONFIG_PM_SLEEP |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 277 | static int dw_i2c_plat_prepare(struct device *dev) |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 278 | { |
| 279 | return pm_runtime_suspended(dev); |
| 280 | } |
| 281 | |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 282 | static void dw_i2c_plat_complete(struct device *dev) |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 283 | { |
| 284 | if (dev->power.direct_complete) |
| 285 | pm_request_resume(dev); |
| 286 | } |
| 287 | #else |
Jarkko Nikula | 319d7f0 | 2015-10-21 10:09:17 +0300 | [diff] [blame] | 288 | #define dw_i2c_plat_prepare NULL |
| 289 | #define dw_i2c_plat_complete NULL |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 290 | #endif |
| 291 | |
Mika Westerberg | 1fc2fe2 | 2014-05-15 17:37:23 +0300 | [diff] [blame] | 292 | #ifdef CONFIG_PM |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 293 | static int dw_i2c_plat_suspend(struct device *dev) |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 294 | { |
| 295 | struct platform_device *pdev = to_platform_device(dev); |
| 296 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 297 | |
Mika Westerberg | f537295 | 2014-05-15 17:37:22 +0300 | [diff] [blame] | 298 | i2c_dw_disable(i_dev); |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 299 | clk_disable_unprepare(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 304 | static int dw_i2c_plat_resume(struct device *dev) |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 305 | { |
| 306 | struct platform_device *pdev = to_platform_device(dev); |
| 307 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 308 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 309 | clk_prepare_enable(i_dev->clk); |
David Box | 894acb2 | 2015-01-15 01:12:17 -0800 | [diff] [blame] | 310 | |
| 311 | if (!i_dev->pm_runtime_disabled) |
| 312 | i2c_dw_init(i_dev); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 313 | |
| 314 | return 0; |
| 315 | } |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 316 | |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 317 | static const struct dev_pm_ops dw_i2c_dev_pm_ops = { |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 318 | .prepare = dw_i2c_plat_prepare, |
| 319 | .complete = dw_i2c_plat_complete, |
| 320 | SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume) |
| 321 | SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 322 | }; |
| 323 | |
| 324 | #define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) |
| 325 | #else |
| 326 | #define DW_I2C_DEV_PMOPS NULL |
| 327 | #endif |
Mika Westerberg | 1fc2fe2 | 2014-05-15 17:37:23 +0300 | [diff] [blame] | 328 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 329 | /* work with hotplug and coldplug */ |
| 330 | MODULE_ALIAS("platform:i2c_designware"); |
| 331 | |
| 332 | static struct platform_driver dw_i2c_driver = { |
Jarkko Nikula | 6ad6fde | 2015-08-31 17:31:32 +0300 | [diff] [blame] | 333 | .probe = dw_i2c_plat_probe, |
| 334 | .remove = dw_i2c_plat_remove, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 335 | .driver = { |
| 336 | .name = "i2c_designware", |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 337 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 338 | .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), |
Jisheng Zhang | 8503ff1 | 2015-05-20 22:33:13 +0800 | [diff] [blame] | 339 | .pm = DW_I2C_DEV_PMOPS, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 340 | }, |
| 341 | }; |
| 342 | |
| 343 | static int __init dw_i2c_init_driver(void) |
| 344 | { |
Wolfram Sang | cccdcea | 2013-10-08 22:35:33 +0200 | [diff] [blame] | 345 | return platform_driver_register(&dw_i2c_driver); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 346 | } |
Pratyush Anand | 1045228 | 2012-02-29 12:27:46 +0530 | [diff] [blame] | 347 | subsys_initcall(dw_i2c_init_driver); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 348 | |
| 349 | static void __exit dw_i2c_exit_driver(void) |
| 350 | { |
| 351 | platform_driver_unregister(&dw_i2c_driver); |
| 352 | } |
| 353 | module_exit(dw_i2c_exit_driver); |
| 354 | |
| 355 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 356 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); |
| 357 | MODULE_LICENSE("GPL"); |