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); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 59 | |
| 60 | if (!ACPI_HANDLE(&pdev->dev)) |
| 61 | return -ENODEV; |
| 62 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 63 | dev->adapter.nr = -1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 64 | dev->tx_fifo_depth = 32; |
| 65 | dev->rx_fifo_depth = 32; |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static const struct acpi_device_id dw_i2c_acpi_match[] = { |
| 70 | { "INT33C2", 0 }, |
| 71 | { "INT33C3", 0 }, |
| 72 | { } |
| 73 | }; |
| 74 | MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); |
| 75 | #else |
| 76 | static inline int dw_i2c_acpi_configure(struct platform_device *pdev) |
| 77 | { |
| 78 | return -ENODEV; |
| 79 | } |
| 80 | #endif |
| 81 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 82 | static int dw_i2c_probe(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 83 | { |
| 84 | struct dw_i2c_dev *dev; |
| 85 | struct i2c_adapter *adap; |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 86 | struct resource *mem; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 87 | int irq, r; |
| 88 | |
| 89 | /* NOTE: driver uses the static register mapping */ |
| 90 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 91 | if (!mem) { |
| 92 | dev_err(&pdev->dev, "no mem resource?\n"); |
| 93 | return -EINVAL; |
| 94 | } |
| 95 | |
| 96 | irq = platform_get_irq(pdev, 0); |
| 97 | if (irq < 0) { |
| 98 | dev_err(&pdev->dev, "no irq resource?\n"); |
| 99 | return irq; /* -ENXIO */ |
| 100 | } |
| 101 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 102 | dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); |
| 103 | if (!dev) |
| 104 | return -ENOMEM; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 105 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 106 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
| 107 | if (IS_ERR(dev->base)) |
| 108 | return PTR_ERR(dev->base); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 109 | |
| 110 | init_completion(&dev->cmd_complete); |
| 111 | mutex_init(&dev->lock); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 112 | dev->dev = &pdev->dev; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 113 | dev->irq = irq; |
| 114 | platform_set_drvdata(pdev, dev); |
| 115 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 116 | dev->clk = devm_clk_get(&pdev->dev, NULL); |
Dirk Brandewie | 1d31b58 | 2011-10-06 11:26:30 -0700 | [diff] [blame] | 117 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
| 118 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 119 | if (IS_ERR(dev->clk)) |
| 120 | return PTR_ERR(dev->clk); |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 121 | clk_prepare_enable(dev->clk); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 122 | |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 123 | dev->functionality = |
| 124 | I2C_FUNC_I2C | |
| 125 | I2C_FUNC_10BIT_ADDR | |
| 126 | I2C_FUNC_SMBUS_BYTE | |
| 127 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 128 | I2C_FUNC_SMBUS_WORD_DATA | |
| 129 | I2C_FUNC_SMBUS_I2C_BLOCK; |
Dirk Brandewie | e18563f | 2011-10-06 11:26:32 -0700 | [diff] [blame] | 130 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
| 131 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 132 | |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 133 | /* Try first if we can configure the device from ACPI */ |
| 134 | r = dw_i2c_acpi_configure(pdev); |
| 135 | if (r) { |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 136 | u32 param1 = i2c_dw_read_comp_param(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 137 | |
| 138 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; |
| 139 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 140 | dev->adapter.nr = pdev->id; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 141 | } |
| 142 | r = i2c_dw_init(dev); |
| 143 | if (r) |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 144 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 145 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 146 | i2c_dw_disable_int(dev); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 147 | r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, |
| 148 | pdev->name, dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 149 | if (r) { |
| 150 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 151 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | adap = &dev->adapter; |
| 155 | i2c_set_adapdata(adap, dev); |
| 156 | adap->owner = THIS_MODULE; |
| 157 | adap->class = I2C_CLASS_HWMON; |
| 158 | strlcpy(adap->name, "Synopsys DesignWare I2C adapter", |
| 159 | sizeof(adap->name)); |
| 160 | adap->algo = &i2c_dw_algo; |
| 161 | adap->dev.parent = &pdev->dev; |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 162 | adap->dev.of_node = pdev->dev.of_node; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 163 | ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev)); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 164 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 165 | r = i2c_add_numbered_adapter(adap); |
| 166 | if (r) { |
| 167 | dev_err(&pdev->dev, "failure adding adapter\n"); |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 168 | return r; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 169 | } |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 170 | of_i2c_register_devices(adap); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 171 | acpi_i2c_register_devices(adap); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 172 | |
Andy Shevchenko | 1cb715c | 2013-04-10 00:36:36 +0000 | [diff] [blame] | 173 | /* Increase reference counter */ |
| 174 | get_device(&pdev->dev); |
| 175 | |
Mika Westerberg | 4345233 | 2013-04-10 00:36:42 +0000 | [diff] [blame^] | 176 | pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); |
| 177 | pm_runtime_use_autosuspend(&pdev->dev); |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 178 | pm_runtime_set_active(&pdev->dev); |
| 179 | pm_runtime_enable(&pdev->dev); |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 180 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 181 | return 0; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 182 | } |
| 183 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 184 | static int dw_i2c_remove(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 185 | { |
| 186 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 187 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 188 | pm_runtime_get_sync(&pdev->dev); |
| 189 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 190 | i2c_del_adapter(&dev->adapter); |
| 191 | put_device(&pdev->dev); |
| 192 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 193 | i2c_dw_disable(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 194 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 195 | pm_runtime_put(&pdev->dev); |
| 196 | pm_runtime_disable(&pdev->dev); |
| 197 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 198 | return 0; |
| 199 | } |
| 200 | |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 201 | #ifdef CONFIG_OF |
| 202 | static const struct of_device_id dw_i2c_of_match[] = { |
| 203 | { .compatible = "snps,designware-i2c", }, |
| 204 | {}, |
| 205 | }; |
| 206 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); |
| 207 | #endif |
| 208 | |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 209 | #ifdef CONFIG_PM |
| 210 | static int dw_i2c_suspend(struct device *dev) |
| 211 | { |
| 212 | struct platform_device *pdev = to_platform_device(dev); |
| 213 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 214 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 215 | clk_disable_unprepare(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int dw_i2c_resume(struct device *dev) |
| 221 | { |
| 222 | struct platform_device *pdev = to_platform_device(dev); |
| 223 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 224 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 225 | clk_prepare_enable(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 226 | i2c_dw_init(i_dev); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | #endif |
| 231 | |
| 232 | static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); |
| 233 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 234 | /* work with hotplug and coldplug */ |
| 235 | MODULE_ALIAS("platform:i2c_designware"); |
| 236 | |
| 237 | static struct platform_driver dw_i2c_driver = { |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 238 | .remove = dw_i2c_remove, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 239 | .driver = { |
| 240 | .name = "i2c_designware", |
| 241 | .owner = THIS_MODULE, |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 242 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 243 | .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 244 | .pm = &dw_i2c_dev_pm_ops, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 245 | }, |
| 246 | }; |
| 247 | |
| 248 | static int __init dw_i2c_init_driver(void) |
| 249 | { |
| 250 | return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); |
| 251 | } |
Pratyush Anand | 1045228 | 2012-02-29 12:27:46 +0530 | [diff] [blame] | 252 | subsys_initcall(dw_i2c_init_driver); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 253 | |
| 254 | static void __exit dw_i2c_exit_driver(void) |
| 255 | { |
| 256 | platform_driver_unregister(&dw_i2c_driver); |
| 257 | } |
| 258 | module_exit(dw_i2c_exit_driver); |
| 259 | |
| 260 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 261 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); |
| 262 | MODULE_LICENSE("GPL"); |