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> 379803f868SChristian Ruppert #include <linux/of.h> 38af71100cSRob Herring #include <linux/of_i2c.h> 392373f6b9SDirk Brandewie #include <linux/platform_device.h> 403bf3b289SDeepak Sikri #include <linux/pm.h> 417272194eSMika Westerberg #include <linux/pm_runtime.h> 422373f6b9SDirk Brandewie #include <linux/io.h> 432373f6b9SDirk Brandewie #include <linux/slab.h> 44b61b1415SMika Westerberg #include <linux/acpi.h> 452373f6b9SDirk Brandewie #include "i2c-designware-core.h" 462373f6b9SDirk Brandewie 472373f6b9SDirk Brandewie static struct i2c_algorithm i2c_dw_algo = { 482373f6b9SDirk Brandewie .master_xfer = i2c_dw_xfer, 492373f6b9SDirk Brandewie .functionality = i2c_dw_func, 502373f6b9SDirk Brandewie }; 511d31b58fSDirk Brandewie static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) 521d31b58fSDirk Brandewie { 531d31b58fSDirk Brandewie return clk_get_rate(dev->clk)/1000; 541d31b58fSDirk Brandewie } 552373f6b9SDirk Brandewie 56b61b1415SMika Westerberg #ifdef CONFIG_ACPI 57b61b1415SMika Westerberg static int dw_i2c_acpi_configure(struct platform_device *pdev) 58b61b1415SMika Westerberg { 59b61b1415SMika Westerberg struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 60b61b1415SMika Westerberg 61b61b1415SMika Westerberg if (!ACPI_HANDLE(&pdev->dev)) 62b61b1415SMika Westerberg return -ENODEV; 63b61b1415SMika Westerberg 64b61b1415SMika Westerberg dev->adapter.nr = -1; 65b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 66b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 67b61b1415SMika Westerberg return 0; 68b61b1415SMika Westerberg } 69b61b1415SMika Westerberg 70b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 71b61b1415SMika Westerberg { "INT33C2", 0 }, 72b61b1415SMika Westerberg { "INT33C3", 0 }, 735a7e6bd8SMika Westerberg { "80860F41", 0 }, 74b61b1415SMika Westerberg { } 75b61b1415SMika Westerberg }; 76b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 77b61b1415SMika Westerberg #else 78b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 79b61b1415SMika Westerberg { 80b61b1415SMika Westerberg return -ENODEV; 81b61b1415SMika Westerberg } 82b61b1415SMika Westerberg #endif 83b61b1415SMika Westerberg 840b255e92SBill Pemberton static int dw_i2c_probe(struct platform_device *pdev) 852373f6b9SDirk Brandewie { 862373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 872373f6b9SDirk Brandewie struct i2c_adapter *adap; 881cb715caSAndy Shevchenko struct resource *mem; 892373f6b9SDirk Brandewie int irq, r; 902373f6b9SDirk Brandewie 912373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 922373f6b9SDirk Brandewie if (irq < 0) { 932373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 942373f6b9SDirk Brandewie return irq; /* -ENXIO */ 952373f6b9SDirk Brandewie } 962373f6b9SDirk Brandewie 971cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 981cb715caSAndy Shevchenko if (!dev) 991cb715caSAndy Shevchenko return -ENOMEM; 1002373f6b9SDirk Brandewie 1013cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1021cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 1031cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 1041cb715caSAndy Shevchenko return PTR_ERR(dev->base); 1052373f6b9SDirk Brandewie 1062373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 1072373f6b9SDirk Brandewie mutex_init(&dev->lock); 1081cb715caSAndy Shevchenko dev->dev = &pdev->dev; 1092373f6b9SDirk Brandewie dev->irq = irq; 1102373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 1112373f6b9SDirk Brandewie 1121cb715caSAndy Shevchenko dev->clk = devm_clk_get(&pdev->dev, NULL); 1131d31b58fSDirk Brandewie dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 1141d31b58fSDirk Brandewie 1151cb715caSAndy Shevchenko if (IS_ERR(dev->clk)) 1161cb715caSAndy Shevchenko return PTR_ERR(dev->clk); 117e1fac69fSViresh Kumar clk_prepare_enable(dev->clk); 1182373f6b9SDirk Brandewie 1199803f868SChristian Ruppert if (pdev->dev.of_node) { 1209803f868SChristian Ruppert u32 ht = 0; 1219803f868SChristian Ruppert u32 ic_clk = dev->get_clk_rate_khz(dev); 1229803f868SChristian Ruppert 1239803f868SChristian Ruppert of_property_read_u32(pdev->dev.of_node, 1249803f868SChristian Ruppert "i2c-sda-hold-time-ns", &ht); 12597191d73SVincent Stehlé dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, 12697191d73SVincent Stehlé 1000000); 1279803f868SChristian Ruppert } 1289803f868SChristian Ruppert 1292fa8326bSDirk Brandewie dev->functionality = 1302fa8326bSDirk Brandewie I2C_FUNC_I2C | 1312fa8326bSDirk Brandewie I2C_FUNC_10BIT_ADDR | 1322fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE | 1332fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE_DATA | 1342fa8326bSDirk Brandewie I2C_FUNC_SMBUS_WORD_DATA | 1352fa8326bSDirk Brandewie I2C_FUNC_SMBUS_I2C_BLOCK; 136e18563fcSDirk Brandewie dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 137e18563fcSDirk Brandewie DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; 1382fa8326bSDirk Brandewie 139b61b1415SMika Westerberg /* Try first if we can configure the device from ACPI */ 140b61b1415SMika Westerberg r = dw_i2c_acpi_configure(pdev); 141b61b1415SMika Westerberg if (r) { 142f3fa9f3dSDirk Brandewie u32 param1 = i2c_dw_read_comp_param(dev); 1432373f6b9SDirk Brandewie 1442373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1452373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 146b61b1415SMika Westerberg dev->adapter.nr = pdev->id; 1472373f6b9SDirk Brandewie } 1482373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1492373f6b9SDirk Brandewie if (r) 1501cb715caSAndy Shevchenko return r; 1512373f6b9SDirk Brandewie 152f3fa9f3dSDirk Brandewie i2c_dw_disable_int(dev); 1531cb715caSAndy Shevchenko r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, 1541cb715caSAndy Shevchenko pdev->name, dev); 1552373f6b9SDirk Brandewie if (r) { 1562373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1571cb715caSAndy Shevchenko return r; 1582373f6b9SDirk Brandewie } 1592373f6b9SDirk Brandewie 1602373f6b9SDirk Brandewie adap = &dev->adapter; 1612373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 1622373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 1632373f6b9SDirk Brandewie adap->class = I2C_CLASS_HWMON; 1642373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 1652373f6b9SDirk Brandewie sizeof(adap->name)); 1662373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 1672373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 168af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 1692373f6b9SDirk Brandewie 1702373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 1712373f6b9SDirk Brandewie if (r) { 1722373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 1731cb715caSAndy Shevchenko return r; 1742373f6b9SDirk Brandewie } 175af71100cSRob Herring of_i2c_register_devices(adap); 176b61b1415SMika Westerberg acpi_i2c_register_devices(adap); 1772373f6b9SDirk Brandewie 17843452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 17943452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 1807272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 1817272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 1827272194eSMika Westerberg 1832373f6b9SDirk Brandewie return 0; 1842373f6b9SDirk Brandewie } 1852373f6b9SDirk Brandewie 1860b255e92SBill Pemberton static int dw_i2c_remove(struct platform_device *pdev) 1872373f6b9SDirk Brandewie { 1882373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 1892373f6b9SDirk Brandewie 1907272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 1917272194eSMika Westerberg 1922373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 1932373f6b9SDirk Brandewie 194f3fa9f3dSDirk Brandewie i2c_dw_disable(dev); 1952373f6b9SDirk Brandewie 1967272194eSMika Westerberg pm_runtime_put(&pdev->dev); 1977272194eSMika Westerberg pm_runtime_disable(&pdev->dev); 1987272194eSMika Westerberg 1992373f6b9SDirk Brandewie return 0; 2002373f6b9SDirk Brandewie } 2012373f6b9SDirk Brandewie 202af71100cSRob Herring #ifdef CONFIG_OF 203af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 204af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 205af71100cSRob Herring {}, 206af71100cSRob Herring }; 207af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 208af71100cSRob Herring #endif 209af71100cSRob Herring 2103bf3b289SDeepak Sikri #ifdef CONFIG_PM 2113bf3b289SDeepak Sikri static int dw_i2c_suspend(struct device *dev) 2123bf3b289SDeepak Sikri { 2133bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2143bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2153bf3b289SDeepak Sikri 216e1fac69fSViresh Kumar clk_disable_unprepare(i_dev->clk); 2173bf3b289SDeepak Sikri 2183bf3b289SDeepak Sikri return 0; 2193bf3b289SDeepak Sikri } 2203bf3b289SDeepak Sikri 2213bf3b289SDeepak Sikri static int dw_i2c_resume(struct device *dev) 2223bf3b289SDeepak Sikri { 2233bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2243bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2253bf3b289SDeepak Sikri 226e1fac69fSViresh Kumar clk_prepare_enable(i_dev->clk); 2273bf3b289SDeepak Sikri i2c_dw_init(i_dev); 2283bf3b289SDeepak Sikri 2293bf3b289SDeepak Sikri return 0; 2303bf3b289SDeepak Sikri } 2313bf3b289SDeepak Sikri #endif 2323bf3b289SDeepak Sikri 2333bf3b289SDeepak Sikri static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); 2343bf3b289SDeepak Sikri 2352373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 2362373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 2372373f6b9SDirk Brandewie 2382373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 2390b255e92SBill Pemberton .remove = dw_i2c_remove, 2402373f6b9SDirk Brandewie .driver = { 2412373f6b9SDirk Brandewie .name = "i2c_designware", 2422373f6b9SDirk Brandewie .owner = THIS_MODULE, 243af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 244b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 2453bf3b289SDeepak Sikri .pm = &dw_i2c_dev_pm_ops, 2462373f6b9SDirk Brandewie }, 2472373f6b9SDirk Brandewie }; 2482373f6b9SDirk Brandewie 2492373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 2502373f6b9SDirk Brandewie { 2512373f6b9SDirk Brandewie return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); 2522373f6b9SDirk Brandewie } 25310452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 2542373f6b9SDirk Brandewie 2552373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 2562373f6b9SDirk Brandewie { 2572373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 2582373f6b9SDirk Brandewie } 2592373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 2602373f6b9SDirk Brandewie 2612373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 2622373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 2632373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 264