12373f6b9SDirk Brandewie /* 25b6d721bSLuis Oliveira * Synopsys DesignWare I2C adapter driver. 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 * 232373f6b9SDirk Brandewie */ 24e393f674SLuis Oliveira #include <linux/acpi.h> 25e393f674SLuis Oliveira #include <linux/clk-provider.h> 26e393f674SLuis Oliveira #include <linux/clk.h> 272373f6b9SDirk Brandewie #include <linux/delay.h> 2856d4b8a2SMika Westerberg #include <linux/dmi.h> 292373f6b9SDirk Brandewie #include <linux/err.h> 30e393f674SLuis Oliveira #include <linux/errno.h> 31e393f674SLuis Oliveira #include <linux/i2c.h> 322373f6b9SDirk Brandewie #include <linux/interrupt.h> 33e393f674SLuis Oliveira #include <linux/io.h> 34e393f674SLuis Oliveira #include <linux/kernel.h> 35e393f674SLuis Oliveira #include <linux/module.h> 369803f868SChristian Ruppert #include <linux/of.h> 37e393f674SLuis Oliveira #include <linux/platform_data/i2c-designware.h> 382373f6b9SDirk Brandewie #include <linux/platform_device.h> 393bf3b289SDeepak Sikri #include <linux/pm.h> 407272194eSMika Westerberg #include <linux/pm_runtime.h> 414c5301abSMika Westerberg #include <linux/property.h> 42ab809fd8SZhangfei Gao #include <linux/reset.h> 43e393f674SLuis Oliveira #include <linux/sched.h> 442373f6b9SDirk Brandewie #include <linux/slab.h> 45e393f674SLuis Oliveira 462373f6b9SDirk Brandewie #include "i2c-designware-core.h" 472373f6b9SDirk Brandewie 481d31b58fSDirk Brandewie static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) 491d31b58fSDirk Brandewie { 501d31b58fSDirk Brandewie return clk_get_rate(dev->clk)/1000; 511d31b58fSDirk Brandewie } 522373f6b9SDirk Brandewie 53b61b1415SMika Westerberg #ifdef CONFIG_ACPI 5456d4b8a2SMika Westerberg /* 5556d4b8a2SMika Westerberg * The HCNT/LCNT information coming from ACPI should be the most accurate 5656d4b8a2SMika Westerberg * for given platform. However, some systems get it wrong. On such systems 5756d4b8a2SMika Westerberg * we get better results by calculating those based on the input clock. 5856d4b8a2SMika Westerberg */ 5956d4b8a2SMika Westerberg static const struct dmi_system_id dw_i2c_no_acpi_params[] = { 6056d4b8a2SMika Westerberg { 6156d4b8a2SMika Westerberg .ident = "Dell Inspiron 7348", 6256d4b8a2SMika Westerberg .matches = { 6356d4b8a2SMika Westerberg DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 6456d4b8a2SMika Westerberg DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"), 6556d4b8a2SMika Westerberg }, 6656d4b8a2SMika Westerberg }, 6756d4b8a2SMika Westerberg { } 6856d4b8a2SMika Westerberg }; 6956d4b8a2SMika Westerberg 7057cd1e30SMika Westerberg static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], 7157cd1e30SMika Westerberg u16 *hcnt, u16 *lcnt, u32 *sda_hold) 7257cd1e30SMika Westerberg { 7357cd1e30SMika Westerberg struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 7457cd1e30SMika Westerberg acpi_handle handle = ACPI_HANDLE(&pdev->dev); 7557cd1e30SMika Westerberg union acpi_object *obj; 7657cd1e30SMika Westerberg 7756d4b8a2SMika Westerberg if (dmi_check_system(dw_i2c_no_acpi_params)) 7856d4b8a2SMika Westerberg return; 7956d4b8a2SMika Westerberg 8057cd1e30SMika Westerberg if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) 8157cd1e30SMika Westerberg return; 8257cd1e30SMika Westerberg 8357cd1e30SMika Westerberg obj = (union acpi_object *)buf.pointer; 8457cd1e30SMika Westerberg if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { 8557cd1e30SMika Westerberg const union acpi_object *objs = obj->package.elements; 8657cd1e30SMika Westerberg 8757cd1e30SMika Westerberg *hcnt = (u16)objs[0].integer.value; 8857cd1e30SMika Westerberg *lcnt = (u16)objs[1].integer.value; 8957cd1e30SMika Westerberg *sda_hold = (u32)objs[2].integer.value; 9057cd1e30SMika Westerberg } 9157cd1e30SMika Westerberg 9257cd1e30SMika Westerberg kfree(buf.pointer); 9357cd1e30SMika Westerberg } 9457cd1e30SMika Westerberg 95b61b1415SMika Westerberg static int dw_i2c_acpi_configure(struct platform_device *pdev) 96b61b1415SMika Westerberg { 97b61b1415SMika Westerberg struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 98ad258fb9SJan Kiszka u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0; 99a3d411fbSHans de Goede acpi_handle handle = ACPI_HANDLE(&pdev->dev); 1002d244c81SXiangliang Yu const struct acpi_device_id *id; 101a3d411fbSHans de Goede struct acpi_device *adev; 102a3d411fbSHans de Goede const char *uid; 103b61b1415SMika Westerberg 104b61b1415SMika Westerberg dev->adapter.nr = -1; 105b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 106b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 10757cd1e30SMika Westerberg 10857cd1e30SMika Westerberg /* 109bd698d24Schin.yew.tan@intel.com * Try to get SDA hold time and *CNT values from an ACPI method for 110bd698d24Schin.yew.tan@intel.com * selected speed modes. 11157cd1e30SMika Westerberg */ 1129d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, &ss_ht); 1139d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, &fp_ht); 1149d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, &hs_ht); 1159d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &fs_ht); 1169d640843SArd Biesheuvel 117bd698d24Schin.yew.tan@intel.com switch (dev->clk_freq) { 118bd698d24Schin.yew.tan@intel.com case 100000: 1199d640843SArd Biesheuvel dev->sda_hold_time = ss_ht; 120bd698d24Schin.yew.tan@intel.com break; 121bd698d24Schin.yew.tan@intel.com case 1000000: 1229d640843SArd Biesheuvel dev->sda_hold_time = fp_ht; 123bd698d24Schin.yew.tan@intel.com break; 124bd698d24Schin.yew.tan@intel.com case 3400000: 1259d640843SArd Biesheuvel dev->sda_hold_time = hs_ht; 126bd698d24Schin.yew.tan@intel.com break; 127bd698d24Schin.yew.tan@intel.com case 400000: 128bd698d24Schin.yew.tan@intel.com default: 1299d640843SArd Biesheuvel dev->sda_hold_time = fs_ht; 130bd698d24Schin.yew.tan@intel.com break; 131bd698d24Schin.yew.tan@intel.com } 13257cd1e30SMika Westerberg 1332d244c81SXiangliang Yu id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); 1342d244c81SXiangliang Yu if (id && id->driver_data) 13586524e54SHans de Goede dev->flags |= (u32)id->driver_data; 1362d244c81SXiangliang Yu 137a3d411fbSHans de Goede if (acpi_bus_get_device(handle, &adev)) 138a3d411fbSHans de Goede return -ENODEV; 139a3d411fbSHans de Goede 140a3d411fbSHans de Goede /* 141a3d411fbSHans de Goede * Cherrytrail I2C7 gets used for the PMIC which gets accessed 142a3d411fbSHans de Goede * through ACPI opregions during late suspend / early resume 143a3d411fbSHans de Goede * disable pm for it. 144a3d411fbSHans de Goede */ 145a3d411fbSHans de Goede uid = adev->pnp.unique_id; 146a3d411fbSHans de Goede if ((dev->flags & MODEL_CHERRYTRAIL) && !strcmp(uid, "7")) 147a3d411fbSHans de Goede dev->pm_disabled = true; 148a3d411fbSHans de Goede 149b61b1415SMika Westerberg return 0; 150b61b1415SMika Westerberg } 151b61b1415SMika Westerberg 152b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 153b61b1415SMika Westerberg { "INT33C2", 0 }, 154b61b1415SMika Westerberg { "INT33C3", 0 }, 15525b3dfc8SMika Westerberg { "INT3432", 0 }, 15625b3dfc8SMika Westerberg { "INT3433", 0 }, 1575a7e6bd8SMika Westerberg { "80860F41", 0 }, 158fd476fa2SHans de Goede { "808622C1", MODEL_CHERRYTRAIL }, 1592d244c81SXiangliang Yu { "AMD0010", ACCESS_INTR_MASK }, 160e4e666baSXiangliang Yu { "AMDI0010", ACCESS_INTR_MASK }, 16190708ce2SSuravee Suthikulpanit { "AMDI0510", 0 }, 16204a407f6SLoc Ho { "APMC0D0F", 0 }, 16358dd8abfSHanjun Guo { "HISI02A1", 0 }, 16458dd8abfSHanjun Guo { "HISI02A2", 0 }, 165b61b1415SMika Westerberg { } 166b61b1415SMika Westerberg }; 167b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 168b61b1415SMika Westerberg #else 169b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 170b61b1415SMika Westerberg { 171b61b1415SMika Westerberg return -ENODEV; 172b61b1415SMika Westerberg } 173b61b1415SMika Westerberg #endif 174b61b1415SMika Westerberg 17589a1e1bdSLuis Oliveira static void i2c_dw_configure_master(struct dw_i2c_dev *dev) 17689a1e1bdSLuis Oliveira { 1775b6d721bSLuis Oliveira dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY; 1785b6d721bSLuis Oliveira 17989a1e1bdSLuis Oliveira dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 18089a1e1bdSLuis Oliveira DW_IC_CON_RESTART_EN; 18189a1e1bdSLuis Oliveira 1825b6d721bSLuis Oliveira dev->mode = DW_IC_MASTER; 1835b6d721bSLuis Oliveira 18489a1e1bdSLuis Oliveira switch (dev->clk_freq) { 18589a1e1bdSLuis Oliveira case 100000: 18689a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_STD; 18789a1e1bdSLuis Oliveira break; 18889a1e1bdSLuis Oliveira case 3400000: 18989a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_HIGH; 19089a1e1bdSLuis Oliveira break; 19189a1e1bdSLuis Oliveira default: 19289a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_FAST; 19389a1e1bdSLuis Oliveira } 19489a1e1bdSLuis Oliveira } 19589a1e1bdSLuis Oliveira 1965b6d721bSLuis Oliveira static void i2c_dw_configure_slave(struct dw_i2c_dev *dev) 1975b6d721bSLuis Oliveira { 1985b6d721bSLuis Oliveira dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY; 1995b6d721bSLuis Oliveira 2005b6d721bSLuis Oliveira dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | 2014e2d93deSJarkko Nikula DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED; 2025b6d721bSLuis Oliveira 2035b6d721bSLuis Oliveira dev->mode = DW_IC_SLAVE; 2045b6d721bSLuis Oliveira 2055b6d721bSLuis Oliveira switch (dev->clk_freq) { 2065b6d721bSLuis Oliveira case 100000: 2075b6d721bSLuis Oliveira dev->slave_cfg |= DW_IC_CON_SPEED_STD; 2085b6d721bSLuis Oliveira break; 2095b6d721bSLuis Oliveira case 3400000: 2105b6d721bSLuis Oliveira dev->slave_cfg |= DW_IC_CON_SPEED_HIGH; 2115b6d721bSLuis Oliveira break; 2125b6d721bSLuis Oliveira default: 2135b6d721bSLuis Oliveira dev->slave_cfg |= DW_IC_CON_SPEED_FAST; 2145b6d721bSLuis Oliveira } 2155b6d721bSLuis Oliveira } 2165b6d721bSLuis Oliveira 217b33af11dSSuravee Suthikulpanit static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare) 218b33af11dSSuravee Suthikulpanit { 219b33af11dSSuravee Suthikulpanit if (IS_ERR(i_dev->clk)) 220b33af11dSSuravee Suthikulpanit return PTR_ERR(i_dev->clk); 221b33af11dSSuravee Suthikulpanit 222b33af11dSSuravee Suthikulpanit if (prepare) 223b33af11dSSuravee Suthikulpanit return clk_prepare_enable(i_dev->clk); 224b33af11dSSuravee Suthikulpanit 225b33af11dSSuravee Suthikulpanit clk_disable_unprepare(i_dev->clk); 226b33af11dSSuravee Suthikulpanit return 0; 227b33af11dSSuravee Suthikulpanit } 228b33af11dSSuravee Suthikulpanit 2298e598769STin Huynh static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id) 2308e598769STin Huynh { 2318e598769STin Huynh u32 param, tx_fifo_depth, rx_fifo_depth; 2328e598769STin Huynh 2338e598769STin Huynh /* 2348e598769STin Huynh * Try to detect the FIFO depth if not set by interface driver, 2358e598769STin Huynh * the depth could be from 2 to 256 from HW spec. 2368e598769STin Huynh */ 2378e598769STin Huynh param = i2c_dw_read_comp_param(dev); 2388e598769STin Huynh tx_fifo_depth = ((param >> 16) & 0xff) + 1; 2398e598769STin Huynh rx_fifo_depth = ((param >> 8) & 0xff) + 1; 2408e598769STin Huynh if (!dev->tx_fifo_depth) { 2418e598769STin Huynh dev->tx_fifo_depth = tx_fifo_depth; 2428e598769STin Huynh dev->rx_fifo_depth = rx_fifo_depth; 2438e598769STin Huynh dev->adapter.nr = id; 2448e598769STin Huynh } else if (tx_fifo_depth >= 2) { 2458e598769STin Huynh dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth, 2468e598769STin Huynh tx_fifo_depth); 2478e598769STin Huynh dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth, 2488e598769STin Huynh rx_fifo_depth); 2498e598769STin Huynh } 2508e598769STin Huynh } 2518e598769STin Huynh 252126dbc6bSRafael J. Wysocki static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev) 253126dbc6bSRafael J. Wysocki { 254126dbc6bSRafael J. Wysocki pm_runtime_disable(dev->dev); 255126dbc6bSRafael J. Wysocki 256126dbc6bSRafael J. Wysocki if (dev->pm_disabled) 257126dbc6bSRafael J. Wysocki pm_runtime_put_noidle(dev->dev); 258126dbc6bSRafael J. Wysocki } 259126dbc6bSRafael J. Wysocki 2606ad6fde3SJarkko Nikula static int dw_i2c_plat_probe(struct platform_device *pdev) 2612373f6b9SDirk Brandewie { 2624c5301abSMika Westerberg struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev); 2632373f6b9SDirk Brandewie struct i2c_adapter *adap; 264e393f674SLuis Oliveira struct dw_i2c_dev *dev; 26510f8e7fbSJarkko Nikula u32 acpi_speed, ht = 0; 266e393f674SLuis Oliveira struct resource *mem; 267231d069fSHans de Goede int i, irq, ret; 2684ce8e88fSColin Ian King static const int supported_speeds[] = { 2694ce8e88fSColin Ian King 0, 100000, 400000, 1000000, 3400000 2704ce8e88fSColin Ian King }; 2712373f6b9SDirk Brandewie 2722373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 273b20d3864SAlexey Brodkin if (irq < 0) 274b20d3864SAlexey Brodkin return irq; 2752373f6b9SDirk Brandewie 2761cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 2771cb715caSAndy Shevchenko if (!dev) 2781cb715caSAndy Shevchenko return -ENOMEM; 2792373f6b9SDirk Brandewie 2803cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2811cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 2821cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 2831cb715caSAndy Shevchenko return PTR_ERR(dev->base); 2842373f6b9SDirk Brandewie 2851cb715caSAndy Shevchenko dev->dev = &pdev->dev; 2862373f6b9SDirk Brandewie dev->irq = irq; 2872373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 2882373f6b9SDirk Brandewie 289ab809fd8SZhangfei Gao dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); 290ab809fd8SZhangfei Gao if (IS_ERR(dev->rst)) { 291ab809fd8SZhangfei Gao if (PTR_ERR(dev->rst) == -EPROBE_DEFER) 292ab809fd8SZhangfei Gao return -EPROBE_DEFER; 293ab809fd8SZhangfei Gao } else { 294ab809fd8SZhangfei Gao reset_control_deassert(dev->rst); 295ab809fd8SZhangfei Gao } 296ab809fd8SZhangfei Gao 2974c5301abSMika Westerberg if (pdata) { 29819c0a539SWeifeng Voon dev->clk_freq = pdata->i2c_scl_freq; 2994c5301abSMika Westerberg } else { 3004c5301abSMika Westerberg device_property_read_u32(&pdev->dev, "i2c-sda-hold-time-ns", 3014c5301abSMika Westerberg &ht); 3024c5301abSMika Westerberg device_property_read_u32(&pdev->dev, "i2c-sda-falling-time-ns", 3036468276bSRomain Baeriswyl &dev->sda_falling_time); 3044c5301abSMika Westerberg device_property_read_u32(&pdev->dev, "i2c-scl-falling-time-ns", 3056468276bSRomain Baeriswyl &dev->scl_falling_time); 3064c5301abSMika Westerberg device_property_read_u32(&pdev->dev, "clock-frequency", 30719c0a539SWeifeng Voon &dev->clk_freq); 3084c5301abSMika Westerberg } 3098e5f6b2aSRomain Baeriswyl 31010f8e7fbSJarkko Nikula acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); 311231d069fSHans de Goede /* 312231d069fSHans de Goede * Some DSTDs use a non standard speed, round down to the lowest 313231d069fSHans de Goede * standard speed. 314231d069fSHans de Goede */ 315231d069fSHans de Goede for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) { 316231d069fSHans de Goede if (acpi_speed < supported_speeds[i]) 317231d069fSHans de Goede break; 318231d069fSHans de Goede } 319231d069fSHans de Goede acpi_speed = supported_speeds[i - 1]; 320231d069fSHans de Goede 321973652dbSJarkko Nikula /* 322973652dbSJarkko Nikula * Find bus speed from the "clock-frequency" device property, ACPI 323973652dbSJarkko Nikula * or by using fast mode if neither is set. 324973652dbSJarkko Nikula */ 325973652dbSJarkko Nikula if (acpi_speed && dev->clk_freq) 326973652dbSJarkko Nikula dev->clk_freq = min(dev->clk_freq, acpi_speed); 327973652dbSJarkko Nikula else if (acpi_speed || dev->clk_freq) 328973652dbSJarkko Nikula dev->clk_freq = max(dev->clk_freq, acpi_speed); 329973652dbSJarkko Nikula else 330973652dbSJarkko Nikula dev->clk_freq = 400000; 33110f8e7fbSJarkko Nikula 3324c5301abSMika Westerberg if (has_acpi_companion(&pdev->dev)) 3334c5301abSMika Westerberg dw_i2c_acpi_configure(pdev); 3344c5301abSMika Westerberg 3354c5301abSMika Westerberg /* 336d608c3d9SWeifeng Voon * Only standard mode at 100kHz, fast mode at 400kHz, 337b6e67145SWeifeng Voon * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported. 3388e5f6b2aSRomain Baeriswyl */ 339d608c3d9SWeifeng Voon if (dev->clk_freq != 100000 && dev->clk_freq != 400000 340b6e67145SWeifeng Voon && dev->clk_freq != 1000000 && dev->clk_freq != 3400000) { 341d608c3d9SWeifeng Voon dev_err(&pdev->dev, 34222acc37bSHans de Goede "%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n", 34322acc37bSHans de Goede dev->clk_freq); 344e393f674SLuis Oliveira ret = -EINVAL; 345ab809fd8SZhangfei Gao goto exit_reset; 3468e5f6b2aSRomain Baeriswyl } 3479803f868SChristian Ruppert 348e393f674SLuis Oliveira ret = i2c_dw_probe_lock_support(dev); 349e393f674SLuis Oliveira if (ret) 350ab809fd8SZhangfei Gao goto exit_reset; 351894acb2fSDavid Box 3525b6d721bSLuis Oliveira if (i2c_detect_slave_mode(&pdev->dev)) 3535b6d721bSLuis Oliveira i2c_dw_configure_slave(dev); 3545b6d721bSLuis Oliveira else 35589a1e1bdSLuis Oliveira i2c_dw_configure_master(dev); 3562fa8326bSDirk Brandewie 357925ddb24SMika Westerberg dev->clk = devm_clk_get(&pdev->dev, NULL); 358b33af11dSSuravee Suthikulpanit if (!i2c_dw_plat_prepare_clk(dev, true)) { 359925ddb24SMika Westerberg dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 360925ddb24SMika Westerberg 361b33af11dSSuravee Suthikulpanit if (!dev->sda_hold_time && ht) 362b33af11dSSuravee Suthikulpanit dev->sda_hold_time = div_u64( 363b33af11dSSuravee Suthikulpanit (u64)dev->get_clk_rate_khz(dev) * ht + 500000, 364925ddb24SMika Westerberg 1000000); 365925ddb24SMika Westerberg } 366925ddb24SMika Westerberg 3678e598769STin Huynh dw_i2c_set_fifo_size(dev, pdev->id); 3682373f6b9SDirk Brandewie 3692373f6b9SDirk Brandewie adap = &dev->adapter; 3702373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 37170fba830SWolfram Sang adap->class = I2C_CLASS_DEPRECATED; 3728eb5c87aSDustin Byford ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); 373af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 3742373f6b9SDirk Brandewie 375422cb781SRafael J. Wysocki dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE); 376422cb781SRafael J. Wysocki 377126dbc6bSRafael J. Wysocki /* The code below assumes runtime PM to be disabled. */ 378126dbc6bSRafael J. Wysocki WARN_ON(pm_runtime_enabled(&pdev->dev)); 379126dbc6bSRafael J. Wysocki 38043452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 38143452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 3827272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 383126dbc6bSRafael J. Wysocki 384126dbc6bSRafael J. Wysocki if (dev->pm_disabled) 385126dbc6bSRafael J. Wysocki pm_runtime_get_noresume(&pdev->dev); 386126dbc6bSRafael J. Wysocki 3877272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 3887272194eSMika Westerberg 3895b6d721bSLuis Oliveira if (dev->mode == DW_IC_SLAVE) 3905b6d721bSLuis Oliveira ret = i2c_dw_probe_slave(dev); 3915b6d721bSLuis Oliveira else 392e393f674SLuis Oliveira ret = i2c_dw_probe(dev); 3935b6d721bSLuis Oliveira 394e393f674SLuis Oliveira if (ret) 395ab809fd8SZhangfei Gao goto exit_probe; 39636d48fb5SWolfram Sang 397e393f674SLuis Oliveira return ret; 398ab809fd8SZhangfei Gao 399ab809fd8SZhangfei Gao exit_probe: 400126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 401ab809fd8SZhangfei Gao exit_reset: 402ab809fd8SZhangfei Gao if (!IS_ERR_OR_NULL(dev->rst)) 403ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 404e393f674SLuis Oliveira return ret; 4052373f6b9SDirk Brandewie } 4062373f6b9SDirk Brandewie 4076ad6fde3SJarkko Nikula static int dw_i2c_plat_remove(struct platform_device *pdev) 4082373f6b9SDirk Brandewie { 4092373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 4102373f6b9SDirk Brandewie 4117272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 4127272194eSMika Westerberg 4132373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 4142373f6b9SDirk Brandewie 41590312351SLuis Oliveira dev->disable(dev); 4162373f6b9SDirk Brandewie 417edfc3901SMika Westerberg pm_runtime_dont_use_autosuspend(&pdev->dev); 418edfc3901SMika Westerberg pm_runtime_put_sync(&pdev->dev); 419126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 420126dbc6bSRafael J. Wysocki 421ab809fd8SZhangfei Gao if (!IS_ERR_OR_NULL(dev->rst)) 422ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 4237272194eSMika Westerberg 424086cb4afSHans de Goede i2c_dw_remove_lock_support(dev); 425086cb4afSHans de Goede 4262373f6b9SDirk Brandewie return 0; 4272373f6b9SDirk Brandewie } 4282373f6b9SDirk Brandewie 429af71100cSRob Herring #ifdef CONFIG_OF 430af71100cSRob Herring static const struct of_device_id dw_i2c_of_match[] = { 431af71100cSRob Herring { .compatible = "snps,designware-i2c", }, 432af71100cSRob Herring {}, 433af71100cSRob Herring }; 434af71100cSRob Herring MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 435af71100cSRob Herring #endif 436af71100cSRob Herring 4378503ff16SJisheng Zhang #ifdef CONFIG_PM_SLEEP 4386ad6fde3SJarkko Nikula static int dw_i2c_plat_prepare(struct device *dev) 4398503ff16SJisheng Zhang { 440422cb781SRafael J. Wysocki /* 441422cb781SRafael J. Wysocki * If the ACPI companion device object is present for this device, it 442422cb781SRafael J. Wysocki * may be accessed during suspend and resume of other devices via I2C 443422cb781SRafael J. Wysocki * operation regions, so tell the PM core and middle layers to avoid 444422cb781SRafael J. Wysocki * skipping system suspend/resume callbacks for it in that case. 445422cb781SRafael J. Wysocki */ 446422cb781SRafael J. Wysocki return !has_acpi_companion(dev); 4478503ff16SJisheng Zhang } 4488503ff16SJisheng Zhang 4496ad6fde3SJarkko Nikula static void dw_i2c_plat_complete(struct device *dev) 4508503ff16SJisheng Zhang { 4518503ff16SJisheng Zhang if (dev->power.direct_complete) 4528503ff16SJisheng Zhang pm_request_resume(dev); 4538503ff16SJisheng Zhang } 4548503ff16SJisheng Zhang #else 455319d7f05SJarkko Nikula #define dw_i2c_plat_prepare NULL 456319d7f05SJarkko Nikula #define dw_i2c_plat_complete NULL 4578503ff16SJisheng Zhang #endif 4588503ff16SJisheng Zhang 4591fc2fe20SMika Westerberg #ifdef CONFIG_PM 46054152772SRafael J. Wysocki static int dw_i2c_plat_suspend(struct device *dev) 4613bf3b289SDeepak Sikri { 4629242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 4633bf3b289SDeepak Sikri 46454152772SRafael J. Wysocki if (i_dev->suspended) { 46554152772SRafael J. Wysocki i_dev->skip_resume = true; 46654152772SRafael J. Wysocki return 0; 46754152772SRafael J. Wysocki } 46854152772SRafael J. Wysocki 46990312351SLuis Oliveira i_dev->disable(i_dev); 470b33af11dSSuravee Suthikulpanit i2c_dw_plat_prepare_clk(i_dev, false); 4713bf3b289SDeepak Sikri 47254152772SRafael J. Wysocki i_dev->suspended = true; 47354152772SRafael J. Wysocki 4743bf3b289SDeepak Sikri return 0; 4753bf3b289SDeepak Sikri } 4763bf3b289SDeepak Sikri 4776ad6fde3SJarkko Nikula static int dw_i2c_plat_resume(struct device *dev) 4783bf3b289SDeepak Sikri { 4799242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 4803bf3b289SDeepak Sikri 48154152772SRafael J. Wysocki if (!i_dev->suspended) 48254152772SRafael J. Wysocki return 0; 48354152772SRafael J. Wysocki 48454152772SRafael J. Wysocki if (i_dev->skip_resume) { 48554152772SRafael J. Wysocki i_dev->skip_resume = false; 48654152772SRafael J. Wysocki return 0; 48754152772SRafael J. Wysocki } 48854152772SRafael J. Wysocki 489b33af11dSSuravee Suthikulpanit i2c_dw_plat_prepare_clk(i_dev, true); 49090312351SLuis Oliveira i_dev->init(i_dev); 4913bf3b289SDeepak Sikri 49254152772SRafael J. Wysocki i_dev->suspended = false; 49354152772SRafael J. Wysocki 4943bf3b289SDeepak Sikri return 0; 4953bf3b289SDeepak Sikri } 4963bf3b289SDeepak Sikri 4978503ff16SJisheng Zhang static const struct dev_pm_ops dw_i2c_dev_pm_ops = { 4986ad6fde3SJarkko Nikula .prepare = dw_i2c_plat_prepare, 4996ad6fde3SJarkko Nikula .complete = dw_i2c_plat_complete, 50054152772SRafael J. Wysocki SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume) 50154152772SRafael J. Wysocki SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) 5028503ff16SJisheng Zhang }; 5038503ff16SJisheng Zhang 5048503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) 5058503ff16SJisheng Zhang #else 5068503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS NULL 5078503ff16SJisheng Zhang #endif 5081fc2fe20SMika Westerberg 509e393f674SLuis Oliveira /* Work with hotplug and coldplug */ 5102373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 5112373f6b9SDirk Brandewie 5122373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 5136ad6fde3SJarkko Nikula .probe = dw_i2c_plat_probe, 5146ad6fde3SJarkko Nikula .remove = dw_i2c_plat_remove, 5152373f6b9SDirk Brandewie .driver = { 5162373f6b9SDirk Brandewie .name = "i2c_designware", 517af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 518b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 5198503ff16SJisheng Zhang .pm = DW_I2C_DEV_PMOPS, 5202373f6b9SDirk Brandewie }, 5212373f6b9SDirk Brandewie }; 5222373f6b9SDirk Brandewie 5232373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 5242373f6b9SDirk Brandewie { 525cccdcea1SWolfram Sang return platform_driver_register(&dw_i2c_driver); 5262373f6b9SDirk Brandewie } 52710452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 5282373f6b9SDirk Brandewie 5292373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 5302373f6b9SDirk Brandewie { 5312373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 5322373f6b9SDirk Brandewie } 5332373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 5342373f6b9SDirk Brandewie 5352373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 5362373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 5372373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 538