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> 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 5657cd1e30SMika Westerberg static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], 5757cd1e30SMika Westerberg u16 *hcnt, u16 *lcnt, u32 *sda_hold) 5857cd1e30SMika Westerberg { 5957cd1e30SMika Westerberg struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 6057cd1e30SMika Westerberg acpi_handle handle = ACPI_HANDLE(&pdev->dev); 6157cd1e30SMika Westerberg union acpi_object *obj; 6257cd1e30SMika Westerberg 6357cd1e30SMika Westerberg if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) 6457cd1e30SMika Westerberg return; 6557cd1e30SMika Westerberg 6657cd1e30SMika Westerberg obj = (union acpi_object *)buf.pointer; 6757cd1e30SMika Westerberg if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { 6857cd1e30SMika Westerberg const union acpi_object *objs = obj->package.elements; 6957cd1e30SMika Westerberg 7057cd1e30SMika Westerberg *hcnt = (u16)objs[0].integer.value; 7157cd1e30SMika Westerberg *lcnt = (u16)objs[1].integer.value; 7257cd1e30SMika Westerberg if (sda_hold) 7357cd1e30SMika Westerberg *sda_hold = (u32)objs[2].integer.value; 7457cd1e30SMika Westerberg } 7557cd1e30SMika Westerberg 7657cd1e30SMika Westerberg kfree(buf.pointer); 7757cd1e30SMika Westerberg } 7857cd1e30SMika Westerberg 79b61b1415SMika Westerberg static int dw_i2c_acpi_configure(struct platform_device *pdev) 80b61b1415SMika Westerberg { 81b61b1415SMika Westerberg struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 8257cd1e30SMika Westerberg bool fs_mode = dev->master_cfg & DW_IC_CON_SPEED_FAST; 83b61b1415SMika Westerberg 84b61b1415SMika Westerberg if (!ACPI_HANDLE(&pdev->dev)) 85b61b1415SMika Westerberg return -ENODEV; 86b61b1415SMika Westerberg 87b61b1415SMika Westerberg dev->adapter.nr = -1; 88b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 89b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 9057cd1e30SMika Westerberg 9157cd1e30SMika Westerberg /* 9257cd1e30SMika Westerberg * Try to get SDA hold time and *CNT values from an ACPI method if 9357cd1e30SMika Westerberg * it exists for both supported speed modes. 9457cd1e30SMika Westerberg */ 9557cd1e30SMika Westerberg dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, 9657cd1e30SMika Westerberg fs_mode ? NULL : &dev->sda_hold_time); 9757cd1e30SMika Westerberg dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, 9857cd1e30SMika Westerberg fs_mode ? &dev->sda_hold_time : NULL); 9957cd1e30SMika Westerberg 100b61b1415SMika Westerberg return 0; 101b61b1415SMika Westerberg } 102b61b1415SMika Westerberg 103b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 104b61b1415SMika Westerberg { "INT33C2", 0 }, 105b61b1415SMika Westerberg { "INT33C3", 0 }, 1065a7e6bd8SMika Westerberg { "80860F41", 0 }, 107b61b1415SMika Westerberg { } 108b61b1415SMika Westerberg }; 109b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 110b61b1415SMika Westerberg #else 111b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 112b61b1415SMika Westerberg { 113b61b1415SMika Westerberg return -ENODEV; 114b61b1415SMika Westerberg } 115b61b1415SMika Westerberg #endif 116b61b1415SMika Westerberg 1170b255e92SBill Pemberton static int dw_i2c_probe(struct platform_device *pdev) 1182373f6b9SDirk Brandewie { 1192373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 1202373f6b9SDirk Brandewie struct i2c_adapter *adap; 1211cb715caSAndy Shevchenko struct resource *mem; 1222373f6b9SDirk Brandewie int irq, r; 1232373f6b9SDirk Brandewie 1242373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 1252373f6b9SDirk Brandewie if (irq < 0) { 1262373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 1272373f6b9SDirk Brandewie return irq; /* -ENXIO */ 1282373f6b9SDirk Brandewie } 1292373f6b9SDirk Brandewie 1301cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 1311cb715caSAndy Shevchenko if (!dev) 1321cb715caSAndy Shevchenko return -ENOMEM; 1332373f6b9SDirk Brandewie 1343cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1351cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 1361cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 1371cb715caSAndy Shevchenko return PTR_ERR(dev->base); 1382373f6b9SDirk Brandewie 1392373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 1402373f6b9SDirk Brandewie mutex_init(&dev->lock); 1411cb715caSAndy Shevchenko dev->dev = &pdev->dev; 1422373f6b9SDirk Brandewie dev->irq = irq; 1432373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 1442373f6b9SDirk Brandewie 1451cb715caSAndy Shevchenko dev->clk = devm_clk_get(&pdev->dev, NULL); 1461d31b58fSDirk Brandewie dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 1471d31b58fSDirk Brandewie 1481cb715caSAndy Shevchenko if (IS_ERR(dev->clk)) 1491cb715caSAndy Shevchenko return PTR_ERR(dev->clk); 150e1fac69fSViresh Kumar clk_prepare_enable(dev->clk); 1512373f6b9SDirk Brandewie 1529803f868SChristian Ruppert if (pdev->dev.of_node) { 1539803f868SChristian Ruppert u32 ht = 0; 1549803f868SChristian Ruppert u32 ic_clk = dev->get_clk_rate_khz(dev); 1559803f868SChristian Ruppert 1569803f868SChristian Ruppert of_property_read_u32(pdev->dev.of_node, 1579803f868SChristian Ruppert "i2c-sda-hold-time-ns", &ht); 15897191d73SVincent Stehlé dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, 15997191d73SVincent Stehlé 1000000); 1609803f868SChristian Ruppert } 1619803f868SChristian Ruppert 1622fa8326bSDirk Brandewie dev->functionality = 1632fa8326bSDirk Brandewie I2C_FUNC_I2C | 1642fa8326bSDirk Brandewie I2C_FUNC_10BIT_ADDR | 1652fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE | 1662fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE_DATA | 1672fa8326bSDirk Brandewie I2C_FUNC_SMBUS_WORD_DATA | 1682fa8326bSDirk Brandewie I2C_FUNC_SMBUS_I2C_BLOCK; 169e18563fcSDirk Brandewie dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 170e18563fcSDirk Brandewie DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; 1712fa8326bSDirk Brandewie 172b61b1415SMika Westerberg /* Try first if we can configure the device from ACPI */ 173b61b1415SMika Westerberg r = dw_i2c_acpi_configure(pdev); 174b61b1415SMika Westerberg if (r) { 175f3fa9f3dSDirk Brandewie u32 param1 = i2c_dw_read_comp_param(dev); 1762373f6b9SDirk Brandewie 1772373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1782373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 179b61b1415SMika Westerberg dev->adapter.nr = pdev->id; 1802373f6b9SDirk Brandewie } 1812373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1822373f6b9SDirk Brandewie if (r) 1831cb715caSAndy Shevchenko return r; 1842373f6b9SDirk Brandewie 185f3fa9f3dSDirk Brandewie i2c_dw_disable_int(dev); 1861cb715caSAndy Shevchenko r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, 1871cb715caSAndy Shevchenko pdev->name, dev); 1882373f6b9SDirk Brandewie if (r) { 1892373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1901cb715caSAndy Shevchenko return r; 1912373f6b9SDirk Brandewie } 1922373f6b9SDirk Brandewie 1932373f6b9SDirk Brandewie adap = &dev->adapter; 1942373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 1952373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 1962373f6b9SDirk Brandewie adap->class = I2C_CLASS_HWMON; 1972373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 1982373f6b9SDirk Brandewie sizeof(adap->name)); 1992373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 2002373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 201af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 2022373f6b9SDirk Brandewie 2032373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 2042373f6b9SDirk Brandewie if (r) { 2052373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 2061cb715caSAndy Shevchenko return r; 2072373f6b9SDirk Brandewie } 2082373f6b9SDirk Brandewie 20943452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 21043452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 2117272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 2127272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 2137272194eSMika Westerberg 2142373f6b9SDirk Brandewie return 0; 2152373f6b9SDirk Brandewie } 2162373f6b9SDirk Brandewie 2170b255e92SBill Pemberton static int dw_i2c_remove(struct platform_device *pdev) 2182373f6b9SDirk Brandewie { 2192373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 2202373f6b9SDirk Brandewie 2217272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 2227272194eSMika Westerberg 2232373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 2242373f6b9SDirk Brandewie 225f3fa9f3dSDirk Brandewie i2c_dw_disable(dev); 2262373f6b9SDirk Brandewie 2277272194eSMika Westerberg pm_runtime_put(&pdev->dev); 2287272194eSMika Westerberg pm_runtime_disable(&pdev->dev); 2297272194eSMika Westerberg 2302373f6b9SDirk Brandewie return 0; 2312373f6b9SDirk Brandewie } 2322373f6b9SDirk Brandewie 233af71100cSRob Herring #ifdef CONFIG_OF 234af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 235af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 236af71100cSRob Herring {}, 237af71100cSRob Herring }; 238af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 239af71100cSRob Herring #endif 240af71100cSRob Herring 241dfb03fb2SJingoo Han #ifdef CONFIG_PM_SLEEP 2423bf3b289SDeepak Sikri static int dw_i2c_suspend(struct device *dev) 2433bf3b289SDeepak Sikri { 2443bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2453bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2463bf3b289SDeepak Sikri 247e1fac69fSViresh Kumar clk_disable_unprepare(i_dev->clk); 2483bf3b289SDeepak Sikri 2493bf3b289SDeepak Sikri return 0; 2503bf3b289SDeepak Sikri } 2513bf3b289SDeepak Sikri 2523bf3b289SDeepak Sikri static int dw_i2c_resume(struct device *dev) 2533bf3b289SDeepak Sikri { 2543bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2553bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2563bf3b289SDeepak Sikri 257e1fac69fSViresh Kumar clk_prepare_enable(i_dev->clk); 2583bf3b289SDeepak Sikri i2c_dw_init(i_dev); 2593bf3b289SDeepak Sikri 2603bf3b289SDeepak Sikri return 0; 2613bf3b289SDeepak Sikri } 2623bf3b289SDeepak Sikri 2633bf3b289SDeepak Sikri static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); 264dfb03fb2SJingoo Han #define DW_I2C_DEV_PM_OPS (&dw_i2c_dev_pm_ops) 265dfb03fb2SJingoo Han #else 266dfb03fb2SJingoo Han #define DW_I2C_DEV_PM_OPS NULL 267dfb03fb2SJingoo Han #endif 2683bf3b289SDeepak Sikri 2692373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 2702373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 2712373f6b9SDirk Brandewie 2722373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 2730b255e92SBill Pemberton .remove = dw_i2c_remove, 2742373f6b9SDirk Brandewie .driver = { 2752373f6b9SDirk Brandewie .name = "i2c_designware", 2762373f6b9SDirk Brandewie .owner = THIS_MODULE, 277af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 278b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 279dfb03fb2SJingoo Han .pm = DW_I2C_DEV_PM_OPS, 2802373f6b9SDirk Brandewie }, 2812373f6b9SDirk Brandewie }; 2822373f6b9SDirk Brandewie 2832373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 2842373f6b9SDirk Brandewie { 2852373f6b9SDirk Brandewie return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); 2862373f6b9SDirk Brandewie } 28710452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 2882373f6b9SDirk Brandewie 2892373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 2902373f6b9SDirk Brandewie { 2912373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 2922373f6b9SDirk Brandewie } 2932373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 2942373f6b9SDirk Brandewie 2952373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 2962373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 2972373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 298