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; |
| 95 | struct resource *mem, *ioarea; |
| 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 | |
| 111 | ioarea = request_mem_region(mem->start, resource_size(mem), |
| 112 | pdev->name); |
| 113 | if (!ioarea) { |
| 114 | dev_err(&pdev->dev, "I2C region already claimed\n"); |
| 115 | return -EBUSY; |
| 116 | } |
| 117 | |
| 118 | dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL); |
| 119 | if (!dev) { |
| 120 | r = -ENOMEM; |
| 121 | goto err_release_region; |
| 122 | } |
| 123 | |
| 124 | init_completion(&dev->cmd_complete); |
| 125 | mutex_init(&dev->lock); |
| 126 | dev->dev = get_device(&pdev->dev); |
| 127 | dev->irq = irq; |
| 128 | platform_set_drvdata(pdev, dev); |
| 129 | |
| 130 | dev->clk = clk_get(&pdev->dev, NULL); |
Dirk Brandewie | 1d31b58 | 2011-10-06 11:26:30 -0700 | [diff] [blame] | 131 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
| 132 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 133 | if (IS_ERR(dev->clk)) { |
| 134 | r = -ENODEV; |
| 135 | goto err_free_mem; |
| 136 | } |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 137 | clk_prepare_enable(dev->clk); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 138 | |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 139 | dev->functionality = |
| 140 | I2C_FUNC_I2C | |
| 141 | I2C_FUNC_10BIT_ADDR | |
| 142 | I2C_FUNC_SMBUS_BYTE | |
| 143 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 144 | I2C_FUNC_SMBUS_WORD_DATA | |
| 145 | I2C_FUNC_SMBUS_I2C_BLOCK; |
Dirk Brandewie | e18563f | 2011-10-06 11:26:32 -0700 | [diff] [blame] | 146 | dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | |
| 147 | DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; |
Dirk Brandewie | 2fa8326 | 2011-10-06 11:26:31 -0700 | [diff] [blame] | 148 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 149 | dev->base = ioremap(mem->start, resource_size(mem)); |
| 150 | if (dev->base == NULL) { |
| 151 | dev_err(&pdev->dev, "failure mapping io resources\n"); |
| 152 | r = -EBUSY; |
| 153 | goto err_unuse_clocks; |
| 154 | } |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 155 | |
| 156 | /* Try first if we can configure the device from ACPI */ |
| 157 | r = dw_i2c_acpi_configure(pdev); |
| 158 | if (r) { |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 159 | u32 param1 = i2c_dw_read_comp_param(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 160 | |
| 161 | dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; |
| 162 | dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 163 | dev->adapter.nr = pdev->id; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 164 | } |
| 165 | r = i2c_dw_init(dev); |
| 166 | if (r) |
| 167 | goto err_iounmap; |
| 168 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 169 | i2c_dw_disable_int(dev); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 170 | r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 171 | if (r) { |
| 172 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); |
| 173 | goto err_iounmap; |
| 174 | } |
| 175 | |
| 176 | adap = &dev->adapter; |
| 177 | i2c_set_adapdata(adap, dev); |
| 178 | adap->owner = THIS_MODULE; |
| 179 | adap->class = I2C_CLASS_HWMON; |
| 180 | strlcpy(adap->name, "Synopsys DesignWare I2C adapter", |
| 181 | sizeof(adap->name)); |
| 182 | adap->algo = &i2c_dw_algo; |
| 183 | adap->dev.parent = &pdev->dev; |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 184 | adap->dev.of_node = pdev->dev.of_node; |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 185 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 186 | r = i2c_add_numbered_adapter(adap); |
| 187 | if (r) { |
| 188 | dev_err(&pdev->dev, "failure adding adapter\n"); |
| 189 | goto err_free_irq; |
| 190 | } |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 191 | of_i2c_register_devices(adap); |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 192 | acpi_i2c_register_devices(adap); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 193 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 194 | pm_runtime_set_active(&pdev->dev); |
| 195 | pm_runtime_enable(&pdev->dev); |
| 196 | pm_runtime_put(&pdev->dev); |
| 197 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 198 | return 0; |
| 199 | |
| 200 | err_free_irq: |
| 201 | free_irq(dev->irq, dev); |
| 202 | err_iounmap: |
| 203 | iounmap(dev->base); |
| 204 | err_unuse_clocks: |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 205 | clk_disable_unprepare(dev->clk); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 206 | clk_put(dev->clk); |
| 207 | dev->clk = NULL; |
| 208 | err_free_mem: |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 209 | put_device(&pdev->dev); |
| 210 | kfree(dev); |
| 211 | err_release_region: |
| 212 | release_mem_region(mem->start, resource_size(mem)); |
| 213 | |
| 214 | return r; |
| 215 | } |
| 216 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 217 | static int dw_i2c_remove(struct platform_device *pdev) |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 218 | { |
| 219 | struct dw_i2c_dev *dev = platform_get_drvdata(pdev); |
| 220 | struct resource *mem; |
| 221 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 222 | pm_runtime_get_sync(&pdev->dev); |
| 223 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 224 | i2c_del_adapter(&dev->adapter); |
| 225 | put_device(&pdev->dev); |
| 226 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 227 | clk_disable_unprepare(dev->clk); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 228 | clk_put(dev->clk); |
| 229 | dev->clk = NULL; |
| 230 | |
Dirk Brandewie | f3fa9f3 | 2011-10-06 11:26:34 -0700 | [diff] [blame] | 231 | i2c_dw_disable(dev); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 232 | free_irq(dev->irq, dev); |
| 233 | kfree(dev); |
| 234 | |
Mika Westerberg | 7272194 | 2013-01-17 12:31:06 +0200 | [diff] [blame] | 235 | pm_runtime_put(&pdev->dev); |
| 236 | pm_runtime_disable(&pdev->dev); |
| 237 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 238 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 239 | release_mem_region(mem->start, resource_size(mem)); |
| 240 | return 0; |
| 241 | } |
| 242 | |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 243 | #ifdef CONFIG_OF |
| 244 | static const struct of_device_id dw_i2c_of_match[] = { |
| 245 | { .compatible = "snps,designware-i2c", }, |
| 246 | {}, |
| 247 | }; |
| 248 | MODULE_DEVICE_TABLE(of, dw_i2c_of_match); |
| 249 | #endif |
| 250 | |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 251 | #ifdef CONFIG_PM |
| 252 | static int dw_i2c_suspend(struct device *dev) |
| 253 | { |
| 254 | struct platform_device *pdev = to_platform_device(dev); |
| 255 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 256 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 257 | clk_disable_unprepare(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | static int dw_i2c_resume(struct device *dev) |
| 263 | { |
| 264 | struct platform_device *pdev = to_platform_device(dev); |
| 265 | struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); |
| 266 | |
Viresh Kumar | e1fac69 | 2012-04-17 17:04:31 +0530 | [diff] [blame] | 267 | clk_prepare_enable(i_dev->clk); |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 268 | i2c_dw_init(i_dev); |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | #endif |
| 273 | |
| 274 | static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); |
| 275 | |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 276 | /* work with hotplug and coldplug */ |
| 277 | MODULE_ALIAS("platform:i2c_designware"); |
| 278 | |
| 279 | static struct platform_driver dw_i2c_driver = { |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 280 | .remove = dw_i2c_remove, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 281 | .driver = { |
| 282 | .name = "i2c_designware", |
| 283 | .owner = THIS_MODULE, |
Rob Herring | af71100 | 2011-11-08 14:43:47 -0600 | [diff] [blame] | 284 | .of_match_table = of_match_ptr(dw_i2c_of_match), |
Mika Westerberg | b61b141 | 2013-01-17 12:31:07 +0200 | [diff] [blame] | 285 | .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), |
Deepak Sikri | 3bf3b28 | 2012-02-24 17:01:15 +0530 | [diff] [blame] | 286 | .pm = &dw_i2c_dev_pm_ops, |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 287 | }, |
| 288 | }; |
| 289 | |
| 290 | static int __init dw_i2c_init_driver(void) |
| 291 | { |
| 292 | return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); |
| 293 | } |
Pratyush Anand | 1045228 | 2012-02-29 12:27:46 +0530 | [diff] [blame] | 294 | subsys_initcall(dw_i2c_init_driver); |
Dirk Brandewie | 2373f6b | 2011-10-29 10:57:23 +0100 | [diff] [blame] | 295 | |
| 296 | static void __exit dw_i2c_exit_driver(void) |
| 297 | { |
| 298 | platform_driver_unregister(&dw_i2c_driver); |
| 299 | } |
| 300 | module_exit(dw_i2c_exit_driver); |
| 301 | |
| 302 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 303 | MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); |
| 304 | MODULE_LICENSE("GPL"); |