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 struct acpi_device *adev; 60b61b1415SMika Westerberg int busno, ret; 61b61b1415SMika Westerberg 62b61b1415SMika Westerberg if (!ACPI_HANDLE(&pdev->dev)) 63b61b1415SMika Westerberg return -ENODEV; 64b61b1415SMika Westerberg 65b61b1415SMika Westerberg ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev); 66b61b1415SMika Westerberg if (ret) 67b61b1415SMika Westerberg return -ENODEV; 68b61b1415SMika Westerberg 69b61b1415SMika Westerberg dev->adapter.nr = -1; 70b61b1415SMika Westerberg if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno)) 71b61b1415SMika Westerberg dev->adapter.nr = busno; 72b61b1415SMika Westerberg 73b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 74b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 75b61b1415SMika Westerberg return 0; 76b61b1415SMika Westerberg } 77b61b1415SMika Westerberg 78b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 79b61b1415SMika Westerberg { "INT33C2", 0 }, 80b61b1415SMika Westerberg { "INT33C3", 0 }, 81b61b1415SMika Westerberg { } 82b61b1415SMika Westerberg }; 83b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 84b61b1415SMika Westerberg #else 85b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 86b61b1415SMika Westerberg { 87b61b1415SMika Westerberg return -ENODEV; 88b61b1415SMika Westerberg } 89b61b1415SMika Westerberg #endif 90b61b1415SMika Westerberg 910b255e92SBill Pemberton static int dw_i2c_probe(struct platform_device *pdev) 922373f6b9SDirk Brandewie { 932373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 942373f6b9SDirk Brandewie struct i2c_adapter *adap; 952373f6b9SDirk Brandewie struct resource *mem, *ioarea; 962373f6b9SDirk Brandewie int irq, r; 972373f6b9SDirk Brandewie 982373f6b9SDirk Brandewie /* NOTE: driver uses the static register mapping */ 992373f6b9SDirk Brandewie mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1002373f6b9SDirk Brandewie if (!mem) { 1012373f6b9SDirk Brandewie dev_err(&pdev->dev, "no mem resource?\n"); 1022373f6b9SDirk Brandewie return -EINVAL; 1032373f6b9SDirk Brandewie } 1042373f6b9SDirk Brandewie 1052373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 1062373f6b9SDirk Brandewie if (irq < 0) { 1072373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 1082373f6b9SDirk Brandewie return irq; /* -ENXIO */ 1092373f6b9SDirk Brandewie } 1102373f6b9SDirk Brandewie 1112373f6b9SDirk Brandewie ioarea = request_mem_region(mem->start, resource_size(mem), 1122373f6b9SDirk Brandewie pdev->name); 1132373f6b9SDirk Brandewie if (!ioarea) { 1142373f6b9SDirk Brandewie dev_err(&pdev->dev, "I2C region already claimed\n"); 1152373f6b9SDirk Brandewie return -EBUSY; 1162373f6b9SDirk Brandewie } 1172373f6b9SDirk Brandewie 1182373f6b9SDirk Brandewie dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL); 1192373f6b9SDirk Brandewie if (!dev) { 1202373f6b9SDirk Brandewie r = -ENOMEM; 1212373f6b9SDirk Brandewie goto err_release_region; 1222373f6b9SDirk Brandewie } 1232373f6b9SDirk Brandewie 1242373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 1252373f6b9SDirk Brandewie mutex_init(&dev->lock); 1262373f6b9SDirk Brandewie dev->dev = get_device(&pdev->dev); 1272373f6b9SDirk Brandewie dev->irq = irq; 1282373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 1292373f6b9SDirk Brandewie 1302373f6b9SDirk Brandewie dev->clk = clk_get(&pdev->dev, NULL); 1311d31b58fSDirk Brandewie dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 1321d31b58fSDirk Brandewie 1332373f6b9SDirk Brandewie if (IS_ERR(dev->clk)) { 1342373f6b9SDirk Brandewie r = -ENODEV; 1352373f6b9SDirk Brandewie goto err_free_mem; 1362373f6b9SDirk Brandewie } 137e1fac69fSViresh Kumar clk_prepare_enable(dev->clk); 1382373f6b9SDirk Brandewie 1392fa8326bSDirk Brandewie dev->functionality = 1402fa8326bSDirk Brandewie I2C_FUNC_I2C | 1412fa8326bSDirk Brandewie I2C_FUNC_10BIT_ADDR | 1422fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE | 1432fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE_DATA | 1442fa8326bSDirk Brandewie I2C_FUNC_SMBUS_WORD_DATA | 1452fa8326bSDirk Brandewie I2C_FUNC_SMBUS_I2C_BLOCK; 146e18563fcSDirk Brandewie dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 147e18563fcSDirk Brandewie DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; 1482fa8326bSDirk Brandewie 1492373f6b9SDirk Brandewie dev->base = ioremap(mem->start, resource_size(mem)); 1502373f6b9SDirk Brandewie if (dev->base == NULL) { 1512373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure mapping io resources\n"); 1522373f6b9SDirk Brandewie r = -EBUSY; 1532373f6b9SDirk Brandewie goto err_unuse_clocks; 1542373f6b9SDirk Brandewie } 155b61b1415SMika Westerberg 156b61b1415SMika Westerberg /* Try first if we can configure the device from ACPI */ 157b61b1415SMika Westerberg r = dw_i2c_acpi_configure(pdev); 158b61b1415SMika Westerberg if (r) { 159f3fa9f3dSDirk Brandewie u32 param1 = i2c_dw_read_comp_param(dev); 1602373f6b9SDirk Brandewie 1612373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1622373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 163b61b1415SMika Westerberg dev->adapter.nr = pdev->id; 1642373f6b9SDirk Brandewie } 1652373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1662373f6b9SDirk Brandewie if (r) 1672373f6b9SDirk Brandewie goto err_iounmap; 1682373f6b9SDirk Brandewie 169f3fa9f3dSDirk Brandewie i2c_dw_disable_int(dev); 170b61b1415SMika Westerberg r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev); 1712373f6b9SDirk Brandewie if (r) { 1722373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1732373f6b9SDirk Brandewie goto err_iounmap; 1742373f6b9SDirk Brandewie } 1752373f6b9SDirk Brandewie 1762373f6b9SDirk Brandewie adap = &dev->adapter; 1772373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 1782373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 1792373f6b9SDirk Brandewie adap->class = I2C_CLASS_HWMON; 1802373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 1812373f6b9SDirk Brandewie sizeof(adap->name)); 1822373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 1832373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 184af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 185b61b1415SMika Westerberg ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev)); 1862373f6b9SDirk Brandewie 1872373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 1882373f6b9SDirk Brandewie if (r) { 1892373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 1902373f6b9SDirk Brandewie goto err_free_irq; 1912373f6b9SDirk Brandewie } 192af71100cSRob Herring of_i2c_register_devices(adap); 193b61b1415SMika Westerberg acpi_i2c_register_devices(adap); 1942373f6b9SDirk Brandewie 1957272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 1967272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 1977272194eSMika Westerberg pm_runtime_put(&pdev->dev); 1987272194eSMika Westerberg 1992373f6b9SDirk Brandewie return 0; 2002373f6b9SDirk Brandewie 2012373f6b9SDirk Brandewie err_free_irq: 2022373f6b9SDirk Brandewie free_irq(dev->irq, dev); 2032373f6b9SDirk Brandewie err_iounmap: 2042373f6b9SDirk Brandewie iounmap(dev->base); 2052373f6b9SDirk Brandewie err_unuse_clocks: 206e1fac69fSViresh Kumar clk_disable_unprepare(dev->clk); 2072373f6b9SDirk Brandewie clk_put(dev->clk); 2082373f6b9SDirk Brandewie dev->clk = NULL; 2092373f6b9SDirk Brandewie err_free_mem: 2102373f6b9SDirk Brandewie platform_set_drvdata(pdev, NULL); 2112373f6b9SDirk Brandewie put_device(&pdev->dev); 2122373f6b9SDirk Brandewie kfree(dev); 2132373f6b9SDirk Brandewie err_release_region: 2142373f6b9SDirk Brandewie release_mem_region(mem->start, resource_size(mem)); 2152373f6b9SDirk Brandewie 2162373f6b9SDirk Brandewie return r; 2172373f6b9SDirk Brandewie } 2182373f6b9SDirk Brandewie 2190b255e92SBill Pemberton static int dw_i2c_remove(struct platform_device *pdev) 2202373f6b9SDirk Brandewie { 2212373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 2222373f6b9SDirk Brandewie struct resource *mem; 2232373f6b9SDirk Brandewie 2242373f6b9SDirk Brandewie platform_set_drvdata(pdev, NULL); 2257272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 2267272194eSMika Westerberg 2272373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 2282373f6b9SDirk Brandewie put_device(&pdev->dev); 2292373f6b9SDirk Brandewie 230e1fac69fSViresh Kumar clk_disable_unprepare(dev->clk); 2312373f6b9SDirk Brandewie clk_put(dev->clk); 2322373f6b9SDirk Brandewie dev->clk = NULL; 2332373f6b9SDirk Brandewie 234f3fa9f3dSDirk Brandewie i2c_dw_disable(dev); 2352373f6b9SDirk Brandewie free_irq(dev->irq, dev); 2362373f6b9SDirk Brandewie kfree(dev); 2372373f6b9SDirk Brandewie 2387272194eSMika Westerberg pm_runtime_put(&pdev->dev); 2397272194eSMika Westerberg pm_runtime_disable(&pdev->dev); 2407272194eSMika Westerberg 2412373f6b9SDirk Brandewie mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2422373f6b9SDirk Brandewie release_mem_region(mem->start, resource_size(mem)); 2432373f6b9SDirk Brandewie return 0; 2442373f6b9SDirk Brandewie } 2452373f6b9SDirk Brandewie 246af71100cSRob Herring #ifdef CONFIG_OF 247af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 248af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 249af71100cSRob Herring {}, 250af71100cSRob Herring }; 251af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 252af71100cSRob Herring #endif 253af71100cSRob Herring 2543bf3b289SDeepak Sikri #ifdef CONFIG_PM 2553bf3b289SDeepak Sikri static int dw_i2c_suspend(struct device *dev) 2563bf3b289SDeepak Sikri { 2573bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2583bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2593bf3b289SDeepak Sikri 260e1fac69fSViresh Kumar clk_disable_unprepare(i_dev->clk); 2613bf3b289SDeepak Sikri 2623bf3b289SDeepak Sikri return 0; 2633bf3b289SDeepak Sikri } 2643bf3b289SDeepak Sikri 2653bf3b289SDeepak Sikri static int dw_i2c_resume(struct device *dev) 2663bf3b289SDeepak Sikri { 2673bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2683bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2693bf3b289SDeepak Sikri 270e1fac69fSViresh Kumar clk_prepare_enable(i_dev->clk); 2713bf3b289SDeepak Sikri i2c_dw_init(i_dev); 2723bf3b289SDeepak Sikri 2733bf3b289SDeepak Sikri return 0; 2743bf3b289SDeepak Sikri } 2753bf3b289SDeepak Sikri #endif 2763bf3b289SDeepak Sikri 2773bf3b289SDeepak Sikri static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); 2783bf3b289SDeepak Sikri 2792373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 2802373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 2812373f6b9SDirk Brandewie 2822373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 2830b255e92SBill Pemberton .remove = dw_i2c_remove, 2842373f6b9SDirk Brandewie .driver = { 2852373f6b9SDirk Brandewie .name = "i2c_designware", 2862373f6b9SDirk Brandewie .owner = THIS_MODULE, 287af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 288b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 2893bf3b289SDeepak Sikri .pm = &dw_i2c_dev_pm_ops, 2902373f6b9SDirk Brandewie }, 2912373f6b9SDirk Brandewie }; 2922373f6b9SDirk Brandewie 2932373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 2942373f6b9SDirk Brandewie { 2952373f6b9SDirk Brandewie return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); 2962373f6b9SDirk Brandewie } 29710452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 2982373f6b9SDirk Brandewie 2992373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 3002373f6b9SDirk Brandewie { 3012373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 3022373f6b9SDirk Brandewie } 3032373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 3042373f6b9SDirk Brandewie 3052373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 3062373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 3072373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 308