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 }, 10625b3dfc8SMika Westerberg { "INT3432", 0 }, 10725b3dfc8SMika Westerberg { "INT3433", 0 }, 1085a7e6bd8SMika Westerberg { "80860F41", 0 }, 109b61b1415SMika Westerberg { } 110b61b1415SMika Westerberg }; 111b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 112b61b1415SMika Westerberg #else 113b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 114b61b1415SMika Westerberg { 115b61b1415SMika Westerberg return -ENODEV; 116b61b1415SMika Westerberg } 117b61b1415SMika Westerberg #endif 118b61b1415SMika Westerberg 1190b255e92SBill Pemberton static int dw_i2c_probe(struct platform_device *pdev) 1202373f6b9SDirk Brandewie { 1212373f6b9SDirk Brandewie struct dw_i2c_dev *dev; 1222373f6b9SDirk Brandewie struct i2c_adapter *adap; 1231cb715caSAndy Shevchenko struct resource *mem; 1242373f6b9SDirk Brandewie int irq, r; 1252373f6b9SDirk Brandewie 1262373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 1272373f6b9SDirk Brandewie if (irq < 0) { 1282373f6b9SDirk Brandewie dev_err(&pdev->dev, "no irq resource?\n"); 1292373f6b9SDirk Brandewie return irq; /* -ENXIO */ 1302373f6b9SDirk Brandewie } 1312373f6b9SDirk Brandewie 1321cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 1331cb715caSAndy Shevchenko if (!dev) 1341cb715caSAndy Shevchenko return -ENOMEM; 1352373f6b9SDirk Brandewie 1363cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1371cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 1381cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 1391cb715caSAndy Shevchenko return PTR_ERR(dev->base); 1402373f6b9SDirk Brandewie 1412373f6b9SDirk Brandewie init_completion(&dev->cmd_complete); 1422373f6b9SDirk Brandewie mutex_init(&dev->lock); 1431cb715caSAndy Shevchenko dev->dev = &pdev->dev; 1442373f6b9SDirk Brandewie dev->irq = irq; 1452373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 1462373f6b9SDirk Brandewie 1471cb715caSAndy Shevchenko dev->clk = devm_clk_get(&pdev->dev, NULL); 1481d31b58fSDirk Brandewie dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 1491d31b58fSDirk Brandewie 1501cb715caSAndy Shevchenko if (IS_ERR(dev->clk)) 1511cb715caSAndy Shevchenko return PTR_ERR(dev->clk); 152e1fac69fSViresh Kumar clk_prepare_enable(dev->clk); 1532373f6b9SDirk Brandewie 1549803f868SChristian Ruppert if (pdev->dev.of_node) { 1559803f868SChristian Ruppert u32 ht = 0; 1569803f868SChristian Ruppert u32 ic_clk = dev->get_clk_rate_khz(dev); 1579803f868SChristian Ruppert 1589803f868SChristian Ruppert of_property_read_u32(pdev->dev.of_node, 1599803f868SChristian Ruppert "i2c-sda-hold-time-ns", &ht); 16097191d73SVincent Stehlé dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, 16197191d73SVincent Stehlé 1000000); 1626468276bSRomain Baeriswyl 1636468276bSRomain Baeriswyl of_property_read_u32(pdev->dev.of_node, 1646468276bSRomain Baeriswyl "i2c-sda-falling-time-ns", 1656468276bSRomain Baeriswyl &dev->sda_falling_time); 1666468276bSRomain Baeriswyl of_property_read_u32(pdev->dev.of_node, 1676468276bSRomain Baeriswyl "i2c-scl-falling-time-ns", 1686468276bSRomain Baeriswyl &dev->scl_falling_time); 1699803f868SChristian Ruppert } 1709803f868SChristian Ruppert 1712fa8326bSDirk Brandewie dev->functionality = 1722fa8326bSDirk Brandewie I2C_FUNC_I2C | 1732fa8326bSDirk Brandewie I2C_FUNC_10BIT_ADDR | 1742fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE | 1752fa8326bSDirk Brandewie I2C_FUNC_SMBUS_BYTE_DATA | 1762fa8326bSDirk Brandewie I2C_FUNC_SMBUS_WORD_DATA | 1772fa8326bSDirk Brandewie I2C_FUNC_SMBUS_I2C_BLOCK; 178e18563fcSDirk Brandewie dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 179e18563fcSDirk Brandewie DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; 1802fa8326bSDirk Brandewie 181b61b1415SMika Westerberg /* Try first if we can configure the device from ACPI */ 182b61b1415SMika Westerberg r = dw_i2c_acpi_configure(pdev); 183b61b1415SMika Westerberg if (r) { 184f3fa9f3dSDirk Brandewie u32 param1 = i2c_dw_read_comp_param(dev); 1852373f6b9SDirk Brandewie 1862373f6b9SDirk Brandewie dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; 1872373f6b9SDirk Brandewie dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; 188b61b1415SMika Westerberg dev->adapter.nr = pdev->id; 1892373f6b9SDirk Brandewie } 1902373f6b9SDirk Brandewie r = i2c_dw_init(dev); 1912373f6b9SDirk Brandewie if (r) 1921cb715caSAndy Shevchenko return r; 1932373f6b9SDirk Brandewie 194f3fa9f3dSDirk Brandewie i2c_dw_disable_int(dev); 1951cb715caSAndy Shevchenko r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, 1961cb715caSAndy Shevchenko pdev->name, dev); 1972373f6b9SDirk Brandewie if (r) { 1982373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); 1991cb715caSAndy Shevchenko return r; 2002373f6b9SDirk Brandewie } 2012373f6b9SDirk Brandewie 2022373f6b9SDirk Brandewie adap = &dev->adapter; 2032373f6b9SDirk Brandewie i2c_set_adapdata(adap, dev); 2042373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 205834f2d86SWolfram Sang adap->class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED; 2062373f6b9SDirk Brandewie strlcpy(adap->name, "Synopsys DesignWare I2C adapter", 2072373f6b9SDirk Brandewie sizeof(adap->name)); 2082373f6b9SDirk Brandewie adap->algo = &i2c_dw_algo; 2092373f6b9SDirk Brandewie adap->dev.parent = &pdev->dev; 210af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 2112373f6b9SDirk Brandewie 2122373f6b9SDirk Brandewie r = i2c_add_numbered_adapter(adap); 2132373f6b9SDirk Brandewie if (r) { 2142373f6b9SDirk Brandewie dev_err(&pdev->dev, "failure adding adapter\n"); 2151cb715caSAndy Shevchenko return r; 2162373f6b9SDirk Brandewie } 2172373f6b9SDirk Brandewie 21843452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 21943452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 2207272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 2217272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 2227272194eSMika Westerberg 2232373f6b9SDirk Brandewie return 0; 2242373f6b9SDirk Brandewie } 2252373f6b9SDirk Brandewie 2260b255e92SBill Pemberton static int dw_i2c_remove(struct platform_device *pdev) 2272373f6b9SDirk Brandewie { 2282373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 2292373f6b9SDirk Brandewie 2307272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 2317272194eSMika Westerberg 2322373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 2332373f6b9SDirk Brandewie 234f3fa9f3dSDirk Brandewie i2c_dw_disable(dev); 2352373f6b9SDirk Brandewie 2367272194eSMika Westerberg pm_runtime_put(&pdev->dev); 2377272194eSMika Westerberg pm_runtime_disable(&pdev->dev); 2387272194eSMika Westerberg 2392373f6b9SDirk Brandewie return 0; 2402373f6b9SDirk Brandewie } 2412373f6b9SDirk Brandewie 242af71100cSRob Herring #ifdef CONFIG_OF 243af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 244af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 245af71100cSRob Herring {}, 246af71100cSRob Herring }; 247af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 248af71100cSRob Herring #endif 249af71100cSRob Herring 2501fc2fe20SMika Westerberg #ifdef CONFIG_PM 2513bf3b289SDeepak Sikri static int dw_i2c_suspend(struct device *dev) 2523bf3b289SDeepak Sikri { 2533bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2543bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2553bf3b289SDeepak Sikri 256f537295aSMika Westerberg i2c_dw_disable(i_dev); 257e1fac69fSViresh Kumar clk_disable_unprepare(i_dev->clk); 2583bf3b289SDeepak Sikri 2593bf3b289SDeepak Sikri return 0; 2603bf3b289SDeepak Sikri } 2613bf3b289SDeepak Sikri 2623bf3b289SDeepak Sikri static int dw_i2c_resume(struct device *dev) 2633bf3b289SDeepak Sikri { 2643bf3b289SDeepak Sikri struct platform_device *pdev = to_platform_device(dev); 2653bf3b289SDeepak Sikri struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); 2663bf3b289SDeepak Sikri 267e1fac69fSViresh Kumar clk_prepare_enable(i_dev->clk); 2683bf3b289SDeepak Sikri i2c_dw_init(i_dev); 2693bf3b289SDeepak Sikri 2703bf3b289SDeepak Sikri return 0; 2713bf3b289SDeepak Sikri } 272dfb03fb2SJingoo Han #endif 2733bf3b289SDeepak Sikri 2741fc2fe20SMika Westerberg static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, 2751fc2fe20SMika Westerberg dw_i2c_resume, NULL); 2761fc2fe20SMika Westerberg 2772373f6b9SDirk Brandewie /* work with hotplug and coldplug */ 2782373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 2792373f6b9SDirk Brandewie 2802373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 281cccdcea1SWolfram Sang .probe = dw_i2c_probe, 2820b255e92SBill Pemberton .remove = dw_i2c_remove, 2832373f6b9SDirk Brandewie .driver = { 2842373f6b9SDirk Brandewie .name = "i2c_designware", 2852373f6b9SDirk Brandewie .owner = THIS_MODULE, 286af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 287b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 2881fc2fe20SMika Westerberg .pm = &dw_i2c_dev_pm_ops, 2892373f6b9SDirk Brandewie }, 2902373f6b9SDirk Brandewie }; 2912373f6b9SDirk Brandewie 2922373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 2932373f6b9SDirk Brandewie { 294cccdcea1SWolfram Sang return platform_driver_register(&dw_i2c_driver); 2952373f6b9SDirk Brandewie } 29610452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 2972373f6b9SDirk Brandewie 2982373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 2992373f6b9SDirk Brandewie { 3002373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 3012373f6b9SDirk Brandewie } 3022373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 3032373f6b9SDirk Brandewie 3042373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 3052373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 3062373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 307