115c566fcSAndy Shevchenko // SPDX-License-Identifier: GPL-2.0-or-later 22373f6b9SDirk Brandewie /* 35b6d721bSLuis Oliveira * Synopsys DesignWare I2C adapter driver. 42373f6b9SDirk Brandewie * 52373f6b9SDirk Brandewie * Based on the TI DAVINCI I2C adapter driver. 62373f6b9SDirk Brandewie * 72373f6b9SDirk Brandewie * Copyright (C) 2006 Texas Instruments. 82373f6b9SDirk Brandewie * Copyright (C) 2007 MontaVista Software Inc. 92373f6b9SDirk Brandewie * Copyright (C) 2009 Provigent Ltd. 102373f6b9SDirk Brandewie */ 11e393f674SLuis Oliveira #include <linux/acpi.h> 12e393f674SLuis Oliveira #include <linux/clk-provider.h> 13e393f674SLuis Oliveira #include <linux/clk.h> 142373f6b9SDirk Brandewie #include <linux/delay.h> 1556d4b8a2SMika Westerberg #include <linux/dmi.h> 162373f6b9SDirk Brandewie #include <linux/err.h> 17e393f674SLuis Oliveira #include <linux/errno.h> 18e393f674SLuis Oliveira #include <linux/i2c.h> 192373f6b9SDirk Brandewie #include <linux/interrupt.h> 20e393f674SLuis Oliveira #include <linux/io.h> 21e393f674SLuis Oliveira #include <linux/kernel.h> 22e393f674SLuis Oliveira #include <linux/module.h> 239803f868SChristian Ruppert #include <linux/of.h> 24e393f674SLuis Oliveira #include <linux/platform_data/i2c-designware.h> 252373f6b9SDirk Brandewie #include <linux/platform_device.h> 263bf3b289SDeepak Sikri #include <linux/pm.h> 277272194eSMika Westerberg #include <linux/pm_runtime.h> 284c5301abSMika Westerberg #include <linux/property.h> 29ab809fd8SZhangfei Gao #include <linux/reset.h> 30e393f674SLuis Oliveira #include <linux/sched.h> 312373f6b9SDirk Brandewie #include <linux/slab.h> 3202e45646SRafael J. Wysocki #include <linux/suspend.h> 33e393f674SLuis Oliveira 342373f6b9SDirk Brandewie #include "i2c-designware-core.h" 352373f6b9SDirk Brandewie 361d31b58fSDirk Brandewie static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) 371d31b58fSDirk Brandewie { 381d31b58fSDirk Brandewie return clk_get_rate(dev->clk)/1000; 391d31b58fSDirk Brandewie } 402373f6b9SDirk Brandewie 41b61b1415SMika Westerberg #ifdef CONFIG_ACPI 4256d4b8a2SMika Westerberg /* 4356d4b8a2SMika Westerberg * The HCNT/LCNT information coming from ACPI should be the most accurate 4456d4b8a2SMika Westerberg * for given platform. However, some systems get it wrong. On such systems 4556d4b8a2SMika Westerberg * we get better results by calculating those based on the input clock. 4656d4b8a2SMika Westerberg */ 4756d4b8a2SMika Westerberg static const struct dmi_system_id dw_i2c_no_acpi_params[] = { 4856d4b8a2SMika Westerberg { 4956d4b8a2SMika Westerberg .ident = "Dell Inspiron 7348", 5056d4b8a2SMika Westerberg .matches = { 5156d4b8a2SMika Westerberg DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 5256d4b8a2SMika Westerberg DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"), 5356d4b8a2SMika Westerberg }, 5456d4b8a2SMika Westerberg }, 5556d4b8a2SMika Westerberg { } 5656d4b8a2SMika Westerberg }; 5756d4b8a2SMika Westerberg 5857cd1e30SMika Westerberg static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], 5957cd1e30SMika Westerberg u16 *hcnt, u16 *lcnt, u32 *sda_hold) 6057cd1e30SMika Westerberg { 6157cd1e30SMika Westerberg struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 6257cd1e30SMika Westerberg acpi_handle handle = ACPI_HANDLE(&pdev->dev); 6357cd1e30SMika Westerberg union acpi_object *obj; 6457cd1e30SMika Westerberg 6556d4b8a2SMika Westerberg if (dmi_check_system(dw_i2c_no_acpi_params)) 6656d4b8a2SMika Westerberg return; 6756d4b8a2SMika Westerberg 6857cd1e30SMika Westerberg if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) 6957cd1e30SMika Westerberg return; 7057cd1e30SMika Westerberg 7157cd1e30SMika Westerberg obj = (union acpi_object *)buf.pointer; 7257cd1e30SMika Westerberg if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { 7357cd1e30SMika Westerberg const union acpi_object *objs = obj->package.elements; 7457cd1e30SMika Westerberg 7557cd1e30SMika Westerberg *hcnt = (u16)objs[0].integer.value; 7657cd1e30SMika Westerberg *lcnt = (u16)objs[1].integer.value; 7757cd1e30SMika Westerberg *sda_hold = (u32)objs[2].integer.value; 7857cd1e30SMika Westerberg } 7957cd1e30SMika Westerberg 8057cd1e30SMika Westerberg kfree(buf.pointer); 8157cd1e30SMika Westerberg } 8257cd1e30SMika Westerberg 83b61b1415SMika Westerberg static int dw_i2c_acpi_configure(struct platform_device *pdev) 84b61b1415SMika Westerberg { 85b61b1415SMika Westerberg struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 86e3ea52b5SAndy Shevchenko struct i2c_timings *t = &dev->timings; 87ad258fb9SJan Kiszka u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0; 88b61b1415SMika Westerberg 89b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 90b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 9157cd1e30SMika Westerberg 9257cd1e30SMika Westerberg /* 93bd698d24Schin.yew.tan@intel.com * Try to get SDA hold time and *CNT values from an ACPI method for 94bd698d24Schin.yew.tan@intel.com * selected speed modes. 9557cd1e30SMika Westerberg */ 969d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, &ss_ht); 979d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, &fp_ht); 989d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, &hs_ht); 999d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &fs_ht); 1009d640843SArd Biesheuvel 101e3ea52b5SAndy Shevchenko switch (t->bus_freq_hz) { 10290224e64SAndy Shevchenko case I2C_MAX_STANDARD_MODE_FREQ: 1039d640843SArd Biesheuvel dev->sda_hold_time = ss_ht; 104bd698d24Schin.yew.tan@intel.com break; 10590224e64SAndy Shevchenko case I2C_MAX_FAST_MODE_PLUS_FREQ: 1069d640843SArd Biesheuvel dev->sda_hold_time = fp_ht; 107bd698d24Schin.yew.tan@intel.com break; 10890224e64SAndy Shevchenko case I2C_MAX_HIGH_SPEED_MODE_FREQ: 1099d640843SArd Biesheuvel dev->sda_hold_time = hs_ht; 110bd698d24Schin.yew.tan@intel.com break; 11190224e64SAndy Shevchenko case I2C_MAX_FAST_MODE_FREQ: 112bd698d24Schin.yew.tan@intel.com default: 1139d640843SArd Biesheuvel dev->sda_hold_time = fs_ht; 114bd698d24Schin.yew.tan@intel.com break; 115bd698d24Schin.yew.tan@intel.com } 11657cd1e30SMika Westerberg 117b61b1415SMika Westerberg return 0; 118b61b1415SMika Westerberg } 119b61b1415SMika Westerberg 120b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 121b61b1415SMika Westerberg { "INT33C2", 0 }, 122b61b1415SMika Westerberg { "INT33C3", 0 }, 12325b3dfc8SMika Westerberg { "INT3432", 0 }, 12425b3dfc8SMika Westerberg { "INT3433", 0 }, 125b30f2f65SHans de Goede { "80860F41", ACCESS_NO_IRQ_SUSPEND }, 126b30f2f65SHans de Goede { "808622C1", ACCESS_NO_IRQ_SUSPEND | MODEL_CHERRYTRAIL }, 1272d244c81SXiangliang Yu { "AMD0010", ACCESS_INTR_MASK }, 128e4e666baSXiangliang Yu { "AMDI0010", ACCESS_INTR_MASK }, 12990708ce2SSuravee Suthikulpanit { "AMDI0510", 0 }, 13004a407f6SLoc Ho { "APMC0D0F", 0 }, 13158dd8abfSHanjun Guo { "HISI02A1", 0 }, 13258dd8abfSHanjun Guo { "HISI02A2", 0 }, 133dec0a81aSHanjun Guo { "HISI02A3", 0 }, 134b61b1415SMika Westerberg { } 135b61b1415SMika Westerberg }; 136b61b1415SMika Westerberg MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); 137b61b1415SMika Westerberg #else 138b61b1415SMika Westerberg static inline int dw_i2c_acpi_configure(struct platform_device *pdev) 139b61b1415SMika Westerberg { 140b61b1415SMika Westerberg return -ENODEV; 141b61b1415SMika Westerberg } 142b61b1415SMika Westerberg #endif 143b61b1415SMika Westerberg 14496742775SAlexandre Belloni #ifdef CONFIG_OF 1451bb39959SAlexandre Belloni #define MSCC_ICPU_CFG_TWI_DELAY 0x0 1461bb39959SAlexandre Belloni #define MSCC_ICPU_CFG_TWI_DELAY_ENABLE BIT(0) 1471bb39959SAlexandre Belloni #define MSCC_ICPU_CFG_TWI_SPIKE_FILTER 0x4 1481bb39959SAlexandre Belloni 1491bb39959SAlexandre Belloni static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev) 1501bb39959SAlexandre Belloni { 1511bb39959SAlexandre Belloni writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE, 1521bb39959SAlexandre Belloni dev->ext + MSCC_ICPU_CFG_TWI_DELAY); 1531bb39959SAlexandre Belloni 1541bb39959SAlexandre Belloni return 0; 1551bb39959SAlexandre Belloni } 1561bb39959SAlexandre Belloni 1571bb39959SAlexandre Belloni static int dw_i2c_of_configure(struct platform_device *pdev) 1581bb39959SAlexandre Belloni { 1591bb39959SAlexandre Belloni struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 1601bb39959SAlexandre Belloni 1611bb39959SAlexandre Belloni switch (dev->flags & MODEL_MASK) { 1621bb39959SAlexandre Belloni case MODEL_MSCC_OCELOT: 163188fe480SAndy Shevchenko dev->ext = devm_platform_ioremap_resource(pdev, 1); 1641bb39959SAlexandre Belloni if (!IS_ERR(dev->ext)) 1651bb39959SAlexandre Belloni dev->set_sda_hold_time = mscc_twi_set_sda_hold_time; 1661bb39959SAlexandre Belloni break; 1671bb39959SAlexandre Belloni default: 1681bb39959SAlexandre Belloni break; 1691bb39959SAlexandre Belloni } 1701bb39959SAlexandre Belloni 1711bb39959SAlexandre Belloni return 0; 1721bb39959SAlexandre Belloni } 1731bb39959SAlexandre Belloni 17496742775SAlexandre Belloni static const struct of_device_id dw_i2c_of_match[] = { 17596742775SAlexandre Belloni { .compatible = "snps,designware-i2c", }, 1761bb39959SAlexandre Belloni { .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT }, 17796742775SAlexandre Belloni {}, 17896742775SAlexandre Belloni }; 17996742775SAlexandre Belloni MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 1801bb39959SAlexandre Belloni #else 1811bb39959SAlexandre Belloni static inline int dw_i2c_of_configure(struct platform_device *pdev) 1821bb39959SAlexandre Belloni { 1831bb39959SAlexandre Belloni return -ENODEV; 1841bb39959SAlexandre Belloni } 18596742775SAlexandre Belloni #endif 18696742775SAlexandre Belloni 187126dbc6bSRafael J. Wysocki static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev) 188126dbc6bSRafael J. Wysocki { 189126dbc6bSRafael J. Wysocki pm_runtime_disable(dev->dev); 190126dbc6bSRafael J. Wysocki 1919cbeeca0SHans de Goede if (dev->shared_with_punit) 192126dbc6bSRafael J. Wysocki pm_runtime_put_noidle(dev->dev); 193126dbc6bSRafael J. Wysocki } 194126dbc6bSRafael J. Wysocki 1956ad6fde3SJarkko Nikula static int dw_i2c_plat_probe(struct platform_device *pdev) 1962373f6b9SDirk Brandewie { 1974c5301abSMika Westerberg struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev); 1982373f6b9SDirk Brandewie struct i2c_adapter *adap; 199e393f674SLuis Oliveira struct dw_i2c_dev *dev; 200e3ea52b5SAndy Shevchenko struct i2c_timings *t; 201e3ea52b5SAndy Shevchenko u32 acpi_speed; 202231d069fSHans de Goede int i, irq, ret; 2032373f6b9SDirk Brandewie 2042373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 205b20d3864SAlexey Brodkin if (irq < 0) 206b20d3864SAlexey Brodkin return irq; 2072373f6b9SDirk Brandewie 2081cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 2091cb715caSAndy Shevchenko if (!dev) 2101cb715caSAndy Shevchenko return -ENOMEM; 2112373f6b9SDirk Brandewie 212188fe480SAndy Shevchenko dev->base = devm_platform_ioremap_resource(pdev, 0); 2131cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 2141cb715caSAndy Shevchenko return PTR_ERR(dev->base); 2152373f6b9SDirk Brandewie 2161cb715caSAndy Shevchenko dev->dev = &pdev->dev; 2172373f6b9SDirk Brandewie dev->irq = irq; 2182373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 2192373f6b9SDirk Brandewie 220ab809fd8SZhangfei Gao dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); 221a6af48ecSAndy Shevchenko if (IS_ERR(dev->rst)) 222a6af48ecSAndy Shevchenko return PTR_ERR(dev->rst); 223a6af48ecSAndy Shevchenko 224ab809fd8SZhangfei Gao reset_control_deassert(dev->rst); 225ab809fd8SZhangfei Gao 226e3ea52b5SAndy Shevchenko t = &dev->timings; 227e3ea52b5SAndy Shevchenko if (pdata) 228e3ea52b5SAndy Shevchenko t->bus_freq_hz = pdata->i2c_scl_freq; 229e3ea52b5SAndy Shevchenko else 230e3ea52b5SAndy Shevchenko i2c_parse_fw_timings(&pdev->dev, t, false); 2318e5f6b2aSRomain Baeriswyl 23210f8e7fbSJarkko Nikula acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); 233231d069fSHans de Goede /* 234231d069fSHans de Goede * Some DSTDs use a non standard speed, round down to the lowest 235231d069fSHans de Goede * standard speed. 236231d069fSHans de Goede */ 23720ee1d90SAndy Shevchenko for (i = 0; i < ARRAY_SIZE(i2c_dw_supported_speeds); i++) { 23820ee1d90SAndy Shevchenko if (acpi_speed >= i2c_dw_supported_speeds[i]) 239231d069fSHans de Goede break; 240231d069fSHans de Goede } 24120ee1d90SAndy Shevchenko acpi_speed = i < ARRAY_SIZE(i2c_dw_supported_speeds) ? i2c_dw_supported_speeds[i] : 0; 242231d069fSHans de Goede 243973652dbSJarkko Nikula /* 244973652dbSJarkko Nikula * Find bus speed from the "clock-frequency" device property, ACPI 245973652dbSJarkko Nikula * or by using fast mode if neither is set. 246973652dbSJarkko Nikula */ 247e3ea52b5SAndy Shevchenko if (acpi_speed && t->bus_freq_hz) 248e3ea52b5SAndy Shevchenko t->bus_freq_hz = min(t->bus_freq_hz, acpi_speed); 249e3ea52b5SAndy Shevchenko else if (acpi_speed || t->bus_freq_hz) 250e3ea52b5SAndy Shevchenko t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed); 251973652dbSJarkko Nikula else 25290224e64SAndy Shevchenko t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ; 25310f8e7fbSJarkko Nikula 2541732c22aSAlexandre Belloni dev->flags |= (uintptr_t)device_get_match_data(&pdev->dev); 2551732c22aSAlexandre Belloni 2561bb39959SAlexandre Belloni if (pdev->dev.of_node) 2571bb39959SAlexandre Belloni dw_i2c_of_configure(pdev); 2581bb39959SAlexandre Belloni 2594c5301abSMika Westerberg if (has_acpi_companion(&pdev->dev)) 2604c5301abSMika Westerberg dw_i2c_acpi_configure(pdev); 2614c5301abSMika Westerberg 26220ee1d90SAndy Shevchenko ret = i2c_dw_validate_speed(dev); 26320ee1d90SAndy Shevchenko if (ret) 264ab809fd8SZhangfei Gao goto exit_reset; 2659803f868SChristian Ruppert 266e393f674SLuis Oliveira ret = i2c_dw_probe_lock_support(dev); 267e393f674SLuis Oliveira if (ret) 268ab809fd8SZhangfei Gao goto exit_reset; 269894acb2fSDavid Box 2703ebe40edSAndy Shevchenko i2c_dw_configure(dev); 2712fa8326bSDirk Brandewie 272c62ebb3dSPhil Edworthy /* Optional interface clock */ 273c62ebb3dSPhil Edworthy dev->pclk = devm_clk_get_optional(&pdev->dev, "pclk"); 27471dc297cSAndy Shevchenko if (IS_ERR(dev->pclk)) { 27571dc297cSAndy Shevchenko ret = PTR_ERR(dev->pclk); 27671dc297cSAndy Shevchenko goto exit_reset; 27771dc297cSAndy Shevchenko } 278c62ebb3dSPhil Edworthy 279925ddb24SMika Westerberg dev->clk = devm_clk_get(&pdev->dev, NULL); 2800326f9f8SPhil Reid if (!i2c_dw_prepare_clk(dev, true)) { 281e3ea52b5SAndy Shevchenko u64 clk_khz; 282925ddb24SMika Westerberg 283e3ea52b5SAndy Shevchenko dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 284e3ea52b5SAndy Shevchenko clk_khz = dev->get_clk_rate_khz(dev); 285e3ea52b5SAndy Shevchenko 286e3ea52b5SAndy Shevchenko if (!dev->sda_hold_time && t->sda_hold_ns) 287e3ea52b5SAndy Shevchenko dev->sda_hold_time = 288e3ea52b5SAndy Shevchenko div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000); 289925ddb24SMika Westerberg } 290925ddb24SMika Westerberg 2912373f6b9SDirk Brandewie adap = &dev->adapter; 2922373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 29370fba830SWolfram Sang adap->class = I2C_CLASS_DEPRECATED; 2948eb5c87aSDustin Byford ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); 295af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 29677f3381aSHans de Goede adap->nr = -1; 2972373f6b9SDirk Brandewie 298d79294d0SHans de Goede if (dev->flags & ACCESS_NO_IRQ_SUSPEND) { 299d79294d0SHans de Goede dev_pm_set_driver_flags(&pdev->dev, 300d79294d0SHans de Goede DPM_FLAG_SMART_PREPARE | 301d79294d0SHans de Goede DPM_FLAG_LEAVE_SUSPENDED); 302d79294d0SHans de Goede } else { 30302e45646SRafael J. Wysocki dev_pm_set_driver_flags(&pdev->dev, 30402e45646SRafael J. Wysocki DPM_FLAG_SMART_PREPARE | 30502e45646SRafael J. Wysocki DPM_FLAG_SMART_SUSPEND | 30602e45646SRafael J. Wysocki DPM_FLAG_LEAVE_SUSPENDED); 307d79294d0SHans de Goede } 308422cb781SRafael J. Wysocki 309126dbc6bSRafael J. Wysocki /* The code below assumes runtime PM to be disabled. */ 310126dbc6bSRafael J. Wysocki WARN_ON(pm_runtime_enabled(&pdev->dev)); 311126dbc6bSRafael J. Wysocki 31243452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 31343452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 3147272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 315126dbc6bSRafael J. Wysocki 3169cbeeca0SHans de Goede if (dev->shared_with_punit) 317126dbc6bSRafael J. Wysocki pm_runtime_get_noresume(&pdev->dev); 318126dbc6bSRafael J. Wysocki 3197272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 3207272194eSMika Westerberg 321e393f674SLuis Oliveira ret = i2c_dw_probe(dev); 322e393f674SLuis Oliveira if (ret) 323ab809fd8SZhangfei Gao goto exit_probe; 32436d48fb5SWolfram Sang 325e393f674SLuis Oliveira return ret; 326ab809fd8SZhangfei Gao 327ab809fd8SZhangfei Gao exit_probe: 328126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 329ab809fd8SZhangfei Gao exit_reset: 330ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 331e393f674SLuis Oliveira return ret; 3322373f6b9SDirk Brandewie } 3332373f6b9SDirk Brandewie 3346ad6fde3SJarkko Nikula static int dw_i2c_plat_remove(struct platform_device *pdev) 3352373f6b9SDirk Brandewie { 3362373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 3372373f6b9SDirk Brandewie 3387272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 3397272194eSMika Westerberg 3402373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 3412373f6b9SDirk Brandewie 34290312351SLuis Oliveira dev->disable(dev); 3432373f6b9SDirk Brandewie 344edfc3901SMika Westerberg pm_runtime_dont_use_autosuspend(&pdev->dev); 345edfc3901SMika Westerberg pm_runtime_put_sync(&pdev->dev); 346126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 347126dbc6bSRafael J. Wysocki 348ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 3497272194eSMika Westerberg 3502373f6b9SDirk Brandewie return 0; 3512373f6b9SDirk Brandewie } 3522373f6b9SDirk Brandewie 3538503ff16SJisheng Zhang #ifdef CONFIG_PM_SLEEP 3546ad6fde3SJarkko Nikula static int dw_i2c_plat_prepare(struct device *dev) 3558503ff16SJisheng Zhang { 356422cb781SRafael J. Wysocki /* 357422cb781SRafael J. Wysocki * If the ACPI companion device object is present for this device, it 358422cb781SRafael J. Wysocki * may be accessed during suspend and resume of other devices via I2C 359422cb781SRafael J. Wysocki * operation regions, so tell the PM core and middle layers to avoid 360422cb781SRafael J. Wysocki * skipping system suspend/resume callbacks for it in that case. 361422cb781SRafael J. Wysocki */ 362422cb781SRafael J. Wysocki return !has_acpi_companion(dev); 3638503ff16SJisheng Zhang } 3648503ff16SJisheng Zhang 3656ad6fde3SJarkko Nikula static void dw_i2c_plat_complete(struct device *dev) 3668503ff16SJisheng Zhang { 36702e45646SRafael J. Wysocki /* 36802e45646SRafael J. Wysocki * The device can only be in runtime suspend at this point if it has not 36902e45646SRafael J. Wysocki * been resumed throughout the ending system suspend/resume cycle, so if 37002e45646SRafael J. Wysocki * the platform firmware might mess up with it, request the runtime PM 37102e45646SRafael J. Wysocki * framework to resume it. 37202e45646SRafael J. Wysocki */ 37302e45646SRafael J. Wysocki if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) 3748503ff16SJisheng Zhang pm_request_resume(dev); 3758503ff16SJisheng Zhang } 3768503ff16SJisheng Zhang #else 377319d7f05SJarkko Nikula #define dw_i2c_plat_prepare NULL 378319d7f05SJarkko Nikula #define dw_i2c_plat_complete NULL 3798503ff16SJisheng Zhang #endif 3808503ff16SJisheng Zhang 3811fc2fe20SMika Westerberg #ifdef CONFIG_PM 38254152772SRafael J. Wysocki static int dw_i2c_plat_suspend(struct device *dev) 3833bf3b289SDeepak Sikri { 3849242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 3853bf3b289SDeepak Sikri 38627515415SHans de Goede i_dev->suspended = true; 38727515415SHans de Goede 3889cbeeca0SHans de Goede if (i_dev->shared_with_punit) 3899d9a152eSHans de Goede return 0; 3909d9a152eSHans de Goede 39190312351SLuis Oliveira i_dev->disable(i_dev); 3920326f9f8SPhil Reid i2c_dw_prepare_clk(i_dev, false); 3933bf3b289SDeepak Sikri 3943bf3b289SDeepak Sikri return 0; 3953bf3b289SDeepak Sikri } 3963bf3b289SDeepak Sikri 3976ad6fde3SJarkko Nikula static int dw_i2c_plat_resume(struct device *dev) 3983bf3b289SDeepak Sikri { 3999242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 4003bf3b289SDeepak Sikri 4019cbeeca0SHans de Goede if (!i_dev->shared_with_punit) 4020326f9f8SPhil Reid i2c_dw_prepare_clk(i_dev, true); 4039d9a152eSHans de Goede 40490312351SLuis Oliveira i_dev->init(i_dev); 40527515415SHans de Goede i_dev->suspended = false; 4063bf3b289SDeepak Sikri 4073bf3b289SDeepak Sikri return 0; 4083bf3b289SDeepak Sikri } 4093bf3b289SDeepak Sikri 4108503ff16SJisheng Zhang static const struct dev_pm_ops dw_i2c_dev_pm_ops = { 4116ad6fde3SJarkko Nikula .prepare = dw_i2c_plat_prepare, 4126ad6fde3SJarkko Nikula .complete = dw_i2c_plat_complete, 41354152772SRafael J. Wysocki SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume) 41454152772SRafael J. Wysocki SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) 4158503ff16SJisheng Zhang }; 4168503ff16SJisheng Zhang 4178503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) 4188503ff16SJisheng Zhang #else 4198503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS NULL 4208503ff16SJisheng Zhang #endif 4211fc2fe20SMika Westerberg 422e393f674SLuis Oliveira /* Work with hotplug and coldplug */ 4232373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 4242373f6b9SDirk Brandewie 4252373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 4266ad6fde3SJarkko Nikula .probe = dw_i2c_plat_probe, 4276ad6fde3SJarkko Nikula .remove = dw_i2c_plat_remove, 4282373f6b9SDirk Brandewie .driver = { 4292373f6b9SDirk Brandewie .name = "i2c_designware", 430af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 431b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 4328503ff16SJisheng Zhang .pm = DW_I2C_DEV_PMOPS, 4332373f6b9SDirk Brandewie }, 4342373f6b9SDirk Brandewie }; 4352373f6b9SDirk Brandewie 4362373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 4372373f6b9SDirk Brandewie { 438cccdcea1SWolfram Sang return platform_driver_register(&dw_i2c_driver); 4392373f6b9SDirk Brandewie } 44010452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 4412373f6b9SDirk Brandewie 4422373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 4432373f6b9SDirk Brandewie { 4442373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 4452373f6b9SDirk Brandewie } 4462373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 4472373f6b9SDirk Brandewie 4482373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 4492373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 4502373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 451