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. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 25 | * ---------------------------------------------------------------------------- |
| 26 | * |
| 27 | */ |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/i2c.h> |
| 32 | #include <linux/clk.h> |
| 33 | #include <linux/errno.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/err.h> |
| 36 | #include <linux/interrupt.h> |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 37 | #include <linux/of_i2c.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 38 | #include <linux/platform_device.h> |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 39 | #include <linux/pm.h> |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 40 | #include <linux/pm_runtime.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 41 | #include <linux/io.h> |
| 42 | #include <linux/slab.h> |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 43 | #include <linux/acpi.h> |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 44 | #include "i2c-designware-core.h" |
| 45 | |
| 46 | static struct i2c_algorithm i2c_dw_algo = { |
| 47 | .master_xfer = i2c_dw_xfer, |
| 48 | .functionality = i2c_dw_func, |
| 49 | }; |
Dirk Brandewie | 1d31b58 | 2011-10-06 11:26:30 -0700 | [diff] [blame] | 50 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
| 51 | { |
| 52 | return clk_get_rate(dev->clk)/1000; |
| 53 | } |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 54 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 55 | #ifdef CONFIG_ACPI |
| 56 | static int dw_i2c_acpi_configure(struct platform_device *pdev) |
| 57 | { |
| 58 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
| 59 | struct acpi_device *adev; |
| 60 | int busno, ret; |
| 61 | |
| 62 | if (!ACPI_HANDLE(&pdev->dev)) |
| 63 | return -ENODEV; |
| 64 | |
| 65 | ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev); |
| 66 | if (ret) |
| 67 | return -ENODEV; |
| 68 | |
| 69 | dev->adapter.nr = -1; |
| 70 | if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno)) |
| 71 | dev->adapter.nr = busno; |
| 72 | |
| 73 | dev->tx_fifo_depth = 32; |
| 74 | dev->rx_fifo_depth = 32; |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static const struct acpi_device_id dw_i2c_acpi_match[] = { |
| 79 | { "INT33C2", 0 }, |
| 80 | { "INT33C3", 0 }, |
| 81 | { } |
| 82 | }; |
| 83 | MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); |
| 84 | #else |
| 85 | static inline int dw_i2c_acpi_configure(struct platform_device *pdev) |
| 86 | { |
| 87 | return -ENODEV; |
| 88 | } |
| 89 | #endif |
| 90 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 91 | static int dw_i2c_probe(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 92 | { |
| 93 | struct dw_i2c_dev *dev; |
| 94 | struct i2c_adapter *adap; |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 95 | struct resource *mem; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 96 | int irq, r; |
| 97 | |
| 98 | /* NOTE: driver uses the static register mapping */ |
| 99 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 100 | if (!mem) { |
| 101 | dev_err(&pdev->dev, "no mem resource?\n"); |
| 102 | return -EINVAL; |
| 103 | } |
| 104 | |
| 105 | irq = platform_get_irq(pdev, 0); |
| 106 | if (irq < 0) { |
| 107 | dev_err(&pdev->dev, "no irq resource?\n"); |
| 108 | return irq; /* -ENXIO */ |
| 109 | } |
| 110 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 111 | dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); |
| 112 | if (!dev) |
| 113 | return -ENOMEM; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 114 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 115 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
| 116 | if (IS_ERR(dev->base)) |
| 117 | return PTR_ERR(dev->base); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 118 | |
| 119 | init_completion(&dev->cmd_complete); |
| 120 | mutex_init(&dev->lock); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 121 | dev->dev = &pdev->dev; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 122 | dev->irq = irq; |
| 123 | platform_set_drvdata(pdev, dev); |
| 124 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 125 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
Dirk Brandewie | 1d31b58 | 2011-10-06 11:26:30 -0700 | [diff] [blame] | 126 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
| 127 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 128 | if (IS_ERR(dev->clk)) |
| 129 | return PTR_ERR(dev->clk); |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 130 | clk_prepare_enable(dev->clk); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 131 | |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 132 | dev->functionality = |
| 133 | I2C_FUNC_I2C | |
| 134 | I2C_FUNC_10BIT_ADDR | |
| 135 | I2C_FUNC_SMBUS_BYTE | |
| 136 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 137 | I2C_FUNC_SMBUS_WORD_DATA | |
| 138 | I2C_FUNC_SMBUS_I2C_BLOCK; |
Dirk Brandewie | e18563f | 2011-10-06 11:26:32 -0700 | [diff] [blame] | 139 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
| 140 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 141 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 142 | /* Try first if we can configure the device from ACPI */ |
| 143 | r = dw_i2c_acpi_configure(pdev); |
| 144 | if (r) { |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 145 | u32 param1 = i2c_dw_read_comp_param(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 146 | |
| 147 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; |
| 148 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 149 | dev->adapter.nr = pdev->id; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 150 | } |
| 151 | r = i2c_dw_init(dev); |
| 152 | if (r) |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 153 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 154 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 155 | i2c_dw_disable_int(dev); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 156 | r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, |
| 157 | pdev->name, dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 158 | if (r) { |
| 159 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 160 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | adap = &dev->adapter; |
| 164 | i2c_set_adapdata(adap, dev); |
| 165 | adap->owner = THIS_MODULE; |
| 166 | adap->class = I2C_CLASS_HWMON; |
| 167 | strlcpy(adap->name, "Synopsys DesignWare I2C adapter", |
| 168 | sizeof(adap->name)); |
| 169 | adap->algo = &i2c_dw_algo; |
| 170 | adap->dev.parent = &pdev->dev; |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 171 | adap->dev.of_node = pdev->dev.of_node; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 172 | ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev)); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 173 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 174 | r = i2c_add_numbered_adapter(adap); |
| 175 | if (r) { |
| 176 | dev_err(&pdev->dev, "failure adding adapter\n"); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 177 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 178 | } |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 179 | of_i2c_register_devices(adap); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 180 | acpi_i2c_register_devices(adap); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 181 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame^] | 182 | /* Increase reference counter */ |
| 183 | get_device(&pdev->dev); |
| 184 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 185 | pm_runtime_set_active(&pdev->dev); |
| 186 | pm_runtime_enable(&pdev->dev); |
| 187 | pm_runtime_put(&pdev->dev); |
| 188 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 189 | return 0; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 190 | } |
| 191 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 192 | static int dw_i2c_remove(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 193 | { |
| 194 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 195 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 196 | pm_runtime_get_sync(&pdev->dev); |
| 197 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 198 | i2c_del_adapter(&dev->adapter); |
| 199 | put_device(&pdev->dev); |
| 200 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 201 | i2c_dw_disable(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 202 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 203 | pm_runtime_put(&pdev->dev); |
| 204 | pm_runtime_disable(&pdev->dev); |
| 205 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 206 | return 0; |
| 207 | } |
| 208 | |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 209 | #ifdef CONFIG_OF |
| 210 | static const struct of_device_id dw_i2c_of_match[] = { |
| 211 | { .compatible = "snps,designware-i2c", }, |
| 212 | {}, |
| 213 | }; |
| 214 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); |
| 215 | #endif |
| 216 | |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 217 | #ifdef CONFIG_PM |
| 218 | static int dw_i2c_suspend(struct device *dev) |
| 219 | { |
| 220 | struct platform_device *pdev = to_platform_device(dev); |
| 221 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 222 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 223 | clk_disable_unprepare(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | static int dw_i2c_resume(struct device *dev) |
| 229 | { |
| 230 | struct platform_device *pdev = to_platform_device(dev); |
| 231 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 232 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 233 | clk_prepare_enable(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 234 | i2c_dw_init(i_dev); |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | #endif |
| 239 | |
| 240 | static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); |
| 241 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 242 | /* work with hotplug and coldplug */ |
| 243 | MODULE_ALIAS("platform:i2c_designware"); |
| 244 | |
| 245 | static struct platform_driver dw_i2c_driver = { |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 246 | .remove = dw_i2c_remove, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 247 | .driver = { |
| 248 | .name = "i2c_designware", |
| 249 | .owner = THIS_MODULE, |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 250 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 251 | .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 252 | .pm = &dw_i2c_dev_pm_ops, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 253 | }, |
| 254 | }; |
| 255 | |
| 256 | static int __init dw_i2c_init_driver(void) |
| 257 | { |
| 258 | return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); |
| 259 | } |
Pratyush Anand | 1045228 | 2012-02-29 12:27:46 +0530 | [diff] [blame] | 260 | subsys_initcall(dw_i2c_init_driver); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 261 | |
| 262 | static void __exit dw_i2c_exit_driver(void) |
| 263 | { |
| 264 | platform_driver_unregister(&dw_i2c_driver); |
| 265 | } |
| 266 | module_exit(dw_i2c_exit_driver); |
| 267 | |
| 268 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 269 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); |
| 270 | MODULE_LICENSE("GPL"); |