12373f6b9SDirk Brandewie /* 22373f6b9SDirk Brandewie * Synopsys DesignWare I2C adapter driver (master only). 32373f6b9SDirk Brandewie * 42373f6b9SDirk Brandewie * Based on the TI DAVINCI I2C adapter driver. 52373f6b9SDirk Brandewie * 62373f6b9SDirk Brandewie * Copyright (C) 2006 Texas Instruments. 72373f6b9SDirk Brandewie * Copyright (C) 2007 MontaVista Software Inc. 82373f6b9SDirk Brandewie * Copyright (C) 2009 Provigent Ltd. 92373f6b9SDirk Brandewie * 102373f6b9SDirk Brandewie * ---------------------------------------------------------------------------- 112373f6b9SDirk Brandewie * 122373f6b9SDirk Brandewie * This program is free software; you can redistribute it and/or modify 132373f6b9SDirk Brandewie * it under the terms of the GNU General Public License as published by 142373f6b9SDirk Brandewie * the Free Software Foundation; either version 2 of the License, or 152373f6b9SDirk Brandewie * (at your option) any later version. 162373f6b9SDirk Brandewie * 172373f6b9SDirk Brandewie * This program is distributed in the hope that it will be useful, 182373f6b9SDirk Brandewie * but WITHOUT ANY WARRANTY; without even the implied warranty of 192373f6b9SDirk Brandewie * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 202373f6b9SDirk Brandewie * GNU General Public License for more details. 212373f6b9SDirk Brandewie * 222373f6b9SDirk Brandewie * You should have received a copy of the GNU General Public License 232373f6b9SDirk Brandewie * along with this program; if not, write to the Free Software 242373f6b9SDirk Brandewie * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 252373f6b9SDirk Brandewie * ---------------------------------------------------------------------------- 262373f6b9SDirk Brandewie * 272373f6b9SDirk Brandewie */ 282373f6b9SDirk Brandewie #include <linux/kernel.h> 292373f6b9SDirk Brandewie #include <linux/module.h> 302373f6b9SDirk Brandewie #include <linux/delay.h> 312373f6b9SDirk Brandewie #include <linux/i2c.h> 322373f6b9SDirk Brandewie #include <linux/clk.h> 332373f6b9SDirk Brandewie #include <linux/errno.h> 342373f6b9SDirk Brandewie #include <linux/sched.h> 352373f6b9SDirk Brandewie #include <linux/err.h> 362373f6b9SDirk Brandewie #include <linux/interrupt.h> 37af71100cSRob Herring #include <linux/of_i2c.h> 382373f6b9SDirk Brandewie #include <linux/platform_device.h> 393bf3b289SDeepak Sikri #include <linux/pm.h> 407272194eSMika Westerberg #include <linux/pm_runtime.h> 412373f6b9SDirk Brandewie #include <linux/io.h> 422373f6b9SDirk Brandewie #include <linux/slab.h> 43b61b1415SMika Westerberg #include <linux/acpi.h> 442373f6b9SDirk Brandewie #include "i2c-designware-core.h" 452373f6b9SDirk Brandewie 462373f6b9SDirk Brandewie static struct i2c_algorithm i2c_dw_algo = { 472373f6b9SDirk Brandewie .master_xfer = i2c_dw_xfer, 482373f6b9SDirk Brandewie .functionality = i2c_dw_func, 492373f6b9SDirk Brandewie }; 501d31b58fSDirk Brandewie static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) 511d31b58fSDirk Brandewie { 521d31b58fSDirk Brandewie return clk_get_rate(dev->clk)/1000; 531d31b58fSDirk Brandewie } 542373f6b9SDirk Brandewie 55b61b1415SMika Westerberg #ifdef CONFIG_ACPI 56b61b1415SMika Westerberg static int dw_i2c_acpi_configure(struct platform_device *pdev) 57b61b1415SMika Westerberg { 58b61b1415SMika Westerberg struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 59b61b1415SMika Westerberg 60b61b1415SMika Westerberg if (!ACPI_HANDLE(&pdev->dev)) 61b61b1415SMika Westerberg return -ENODEV; 62b61b1415SMika Westerberg 63b61b1415SMika Westerberg dev->adapter.nr = -1; 64b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 65b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 66b61b1415SMika Westerberg return 0; 67b61b1415SMika Westerberg } 68b61b1415SMika Westerberg 69b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 70b61b1415SMika Westerberg { "INT33C2", 0 }, 71b61b1415SMika Westerberg { "INT33C3", 0 }, 725a7e6bd8SMika Westerberg { "80860F41", 0 }, 73b61b1415SMika Westerberg { } 74b61b1415SMika Westerberg }; 75b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 76b61b1415SMika Westerberg #else 77b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 78b61b1415SMika Westerberg { 79b61b1415SMika Westerberg return -ENODEV; 80b61b1415SMika Westerberg } 81b61b1415SMika Westerberg #endif 82b61b1415SMika Westerberg 830b255e92SBill Pemberton static int dw_i2c_probe(struct platform_device *pdev) 842373f6b9SDirk Brandewie { 852373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 862373f6b9SDirk Brandewie struct i2c_adapter *adap; 871cb715caSAndy Shevchenko struct resource *mem; 882373f6b9SDirk Brandewie int irq, r; 892373f6b9SDirk Brandewie 902373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 912373f6b9SDirk Brandewie if (irq < 0) { 922373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 932373f6b9SDirk Brandewie return irq; /* -ENXIO */ 942373f6b9SDirk Brandewie } 952373f6b9SDirk Brandewie 961cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 971cb715caSAndy Shevchenko if (!dev) 981cb715caSAndy Shevchenko return -ENOMEM; 992373f6b9SDirk Brandewie 1003cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1011cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 1021cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 1031cb715caSAndy Shevchenko return PTR_ERR(dev->base); 1042373f6b9SDirk Brandewie 1052373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 1062373f6b9SDirk Brandewie mutex_init(&dev->lock); 1071cb715caSAndy Shevchenko dev->dev = &pdev->dev; 1082373f6b9SDirk Brandewie dev->irq = irq; 1092373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 1102373f6b9SDirk Brandewie 1111cb715caSAndy Shevchenko dev->clk = devm_clk_get(&pdev->dev, NULL); 1121d31b58fSDirk Brandewie dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 1131d31b58fSDirk Brandewie 1141cb715caSAndy Shevchenko if (IS_ERR(dev->clk)) 1151cb715caSAndy Shevchenko return PTR_ERR(dev->clk); 116e1fac69fSViresh Kumar clk_prepare_enable(dev->clk); 1172373f6b9SDirk Brandewie 1182fa8326bSDirk Brandewie dev->functionality = 1192fa8326bSDirk Brandewie I2C_FUNC_I2C | 1202fa8326bSDirk Brandewie I2C_FUNC_10BIT_ADDR | 1212fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE | 1222fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE_DATA | 1232fa8326bSDirk Brandewie I2C_FUNC_SMBUS_WORD_DATA | 1242fa8326bSDirk Brandewie I2C_FUNC_SMBUS_I2C_BLOCK; 125e18563fcSDirk Brandewie dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 126e18563fcSDirk Brandewie DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; 1272fa8326bSDirk Brandewie 128b61b1415SMika Westerberg /* Try first if we can configure the device from ACPI */ 129b61b1415SMika Westerberg r = dw_i2c_acpi_configure(pdev); 130b61b1415SMika Westerberg if (r) { 131f3fa9f3dSDirk Brandewie u32 param1 = i2c_dw_read_comp_param(dev); 1322373f6b9SDirk Brandewie 1332373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1342373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 135b61b1415SMika Westerberg dev->adapter.nr = pdev->id; 1362373f6b9SDirk Brandewie } 1372373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1382373f6b9SDirk Brandewie if (r) 1391cb715caSAndy Shevchenko return r; 1402373f6b9SDirk Brandewie 141f3fa9f3dSDirk Brandewie i2c_dw_disable_int(dev); 1421cb715caSAndy Shevchenko r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, 1431cb715caSAndy Shevchenko pdev->name, dev); 1442373f6b9SDirk Brandewie if (r) { 1452373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1461cb715caSAndy Shevchenko return r; 1472373f6b9SDirk Brandewie } 1482373f6b9SDirk Brandewie 1492373f6b9SDirk Brandewie adap = &dev->adapter; 1502373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 1512373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 1522373f6b9SDirk Brandewie adap->class = I2C_CLASS_HWMON; 1532373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 1542373f6b9SDirk Brandewie sizeof(adap->name)); 1552373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 1562373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 157af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 1582373f6b9SDirk Brandewie 1592373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 1602373f6b9SDirk Brandewie if (r) { 1612373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 1621cb715caSAndy Shevchenko return r; 1632373f6b9SDirk Brandewie } 164af71100cSRob Herring of_i2c_register_devices(adap); 165b61b1415SMika Westerberg acpi_i2c_register_devices(adap); 1662373f6b9SDirk Brandewie 16743452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 16843452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 1697272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 1707272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 1717272194eSMika Westerberg 1722373f6b9SDirk Brandewie return 0; 1732373f6b9SDirk Brandewie } 1742373f6b9SDirk Brandewie 1750b255e92SBill Pemberton static int dw_i2c_remove(struct platform_device *pdev) 1762373f6b9SDirk Brandewie { 1772373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 1782373f6b9SDirk Brandewie 1797272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 1807272194eSMika Westerberg 1812373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 1822373f6b9SDirk Brandewie 183f3fa9f3dSDirk Brandewie i2c_dw_disable(dev); 1842373f6b9SDirk Brandewie 1857272194eSMika Westerberg pm_runtime_put(&pdev->dev); 1867272194eSMika Westerberg pm_runtime_disable(&pdev->dev); 1877272194eSMika Westerberg 1882373f6b9SDirk Brandewie return 0; 1892373f6b9SDirk Brandewie } 1902373f6b9SDirk Brandewie 191af71100cSRob Herring #ifdef CONFIG_OF 192af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 193af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 194af71100cSRob Herring {}, 195af71100cSRob Herring }; 196af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 197af71100cSRob Herring #endif 198af71100cSRob Herring 1993bf3b289SDeepak Sikri #ifdef CONFIG_PM 2003bf3b289SDeepak Sikri static int dw_i2c_suspend(struct device *dev) 2013bf3b289SDeepak Sikri { 2023bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2033bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2043bf3b289SDeepak Sikri 205e1fac69fSViresh Kumar clk_disable_unprepare(i_dev->clk); 2063bf3b289SDeepak Sikri 2073bf3b289SDeepak Sikri return 0; 2083bf3b289SDeepak Sikri } 2093bf3b289SDeepak Sikri 2103bf3b289SDeepak Sikri static int dw_i2c_resume(struct device *dev) 2113bf3b289SDeepak Sikri { 2123bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2133bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2143bf3b289SDeepak Sikri 215e1fac69fSViresh Kumar clk_prepare_enable(i_dev->clk); 2163bf3b289SDeepak Sikri i2c_dw_init(i_dev); 2173bf3b289SDeepak Sikri 2183bf3b289SDeepak Sikri return 0; 2193bf3b289SDeepak Sikri } 2203bf3b289SDeepak Sikri #endif 2213bf3b289SDeepak Sikri 2223bf3b289SDeepak Sikri static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); 2233bf3b289SDeepak Sikri 2242373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 2252373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 2262373f6b9SDirk Brandewie 2272373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 2280b255e92SBill Pemberton .remove = dw_i2c_remove, 2292373f6b9SDirk Brandewie .driver = { 2302373f6b9SDirk Brandewie .name = "i2c_designware", 2312373f6b9SDirk Brandewie .owner = THIS_MODULE, 232af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 233b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 2343bf3b289SDeepak Sikri .pm = &dw_i2c_dev_pm_ops, 2352373f6b9SDirk Brandewie }, 2362373f6b9SDirk Brandewie }; 2372373f6b9SDirk Brandewie 2382373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 2392373f6b9SDirk Brandewie { 2402373f6b9SDirk Brandewie return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); 2412373f6b9SDirk Brandewie } 24210452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 2432373f6b9SDirk Brandewie 2442373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 2452373f6b9SDirk Brandewie { 2462373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 2472373f6b9SDirk Brandewie } 2482373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 2492373f6b9SDirk Brandewie 2502373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 2512373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 2522373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 253