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->adapter.nr = -1; 90b61b1415SMika Westerberg dev->tx_fifo_depth = 32; 91b61b1415SMika Westerberg dev->rx_fifo_depth = 32; 9257cd1e30SMika Westerberg 9357cd1e30SMika Westerberg /* 94bd698d24Schin.yew.tan@intel.com * Try to get SDA hold time and *CNT values from an ACPI method for 95bd698d24Schin.yew.tan@intel.com * selected speed modes. 9657cd1e30SMika Westerberg */ 979d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, &ss_ht); 989d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, &fp_ht); 999d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, &hs_ht); 1009d640843SArd Biesheuvel dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &fs_ht); 1019d640843SArd Biesheuvel 102e3ea52b5SAndy Shevchenko switch (t->bus_freq_hz) { 103bd698d24Schin.yew.tan@intel.com case 100000: 1049d640843SArd Biesheuvel dev->sda_hold_time = ss_ht; 105bd698d24Schin.yew.tan@intel.com break; 106bd698d24Schin.yew.tan@intel.com case 1000000: 1079d640843SArd Biesheuvel dev->sda_hold_time = fp_ht; 108bd698d24Schin.yew.tan@intel.com break; 109bd698d24Schin.yew.tan@intel.com case 3400000: 1109d640843SArd Biesheuvel dev->sda_hold_time = hs_ht; 111bd698d24Schin.yew.tan@intel.com break; 112bd698d24Schin.yew.tan@intel.com case 400000: 113bd698d24Schin.yew.tan@intel.com default: 1149d640843SArd Biesheuvel dev->sda_hold_time = fs_ht; 115bd698d24Schin.yew.tan@intel.com break; 116bd698d24Schin.yew.tan@intel.com } 11757cd1e30SMika Westerberg 118b61b1415SMika Westerberg return 0; 119b61b1415SMika Westerberg } 120b61b1415SMika Westerberg 121b61b1415SMika Westerberg static const struct acpi_device_id dw_i2c_acpi_match[] = { 122b61b1415SMika Westerberg { "INT33C2", 0 }, 123b61b1415SMika Westerberg { "INT33C3", 0 }, 12425b3dfc8SMika Westerberg { "INT3432", 0 }, 12525b3dfc8SMika Westerberg { "INT3433", 0 }, 126b30f2f65SHans de Goede { "80860F41", ACCESS_NO_IRQ_SUSPEND }, 127b30f2f65SHans de Goede { "808622C1", ACCESS_NO_IRQ_SUSPEND | MODEL_CHERRYTRAIL }, 1282d244c81SXiangliang Yu { "AMD0010", ACCESS_INTR_MASK }, 129e4e666baSXiangliang Yu { "AMDI0010", ACCESS_INTR_MASK }, 13090708ce2SSuravee Suthikulpanit { "AMDI0510", 0 }, 13104a407f6SLoc Ho { "APMC0D0F", 0 }, 13258dd8abfSHanjun Guo { "HISI02A1", 0 }, 13358dd8abfSHanjun Guo { "HISI02A2", 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 struct resource *mem; 1611bb39959SAlexandre Belloni 1621bb39959SAlexandre Belloni switch (dev->flags & MODEL_MASK) { 1631bb39959SAlexandre Belloni case MODEL_MSCC_OCELOT: 1641bb39959SAlexandre Belloni mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 1651bb39959SAlexandre Belloni dev->ext = devm_ioremap_resource(&pdev->dev, mem); 1661bb39959SAlexandre Belloni if (!IS_ERR(dev->ext)) 1671bb39959SAlexandre Belloni dev->set_sda_hold_time = mscc_twi_set_sda_hold_time; 1681bb39959SAlexandre Belloni break; 1691bb39959SAlexandre Belloni default: 1701bb39959SAlexandre Belloni break; 1711bb39959SAlexandre Belloni } 1721bb39959SAlexandre Belloni 1731bb39959SAlexandre Belloni return 0; 1741bb39959SAlexandre Belloni } 1751bb39959SAlexandre Belloni 17696742775SAlexandre Belloni static const struct of_device_id dw_i2c_of_match[] = { 17796742775SAlexandre Belloni { .compatible = "snps,designware-i2c", }, 1781bb39959SAlexandre Belloni { .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT }, 17996742775SAlexandre Belloni {}, 18096742775SAlexandre Belloni }; 18196742775SAlexandre Belloni MODULE_DEVICE_TABLE(of, dw_i2c_of_match); 1821bb39959SAlexandre Belloni #else 1831bb39959SAlexandre Belloni static inline int dw_i2c_of_configure(struct platform_device *pdev) 1841bb39959SAlexandre Belloni { 1851bb39959SAlexandre Belloni return -ENODEV; 1861bb39959SAlexandre Belloni } 18796742775SAlexandre Belloni #endif 18896742775SAlexandre Belloni 18989a1e1bdSLuis Oliveira static void i2c_dw_configure_master(struct dw_i2c_dev *dev) 19089a1e1bdSLuis Oliveira { 191e3ea52b5SAndy Shevchenko struct i2c_timings *t = &dev->timings; 192e3ea52b5SAndy Shevchenko 1935b6d721bSLuis Oliveira dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY; 1945b6d721bSLuis Oliveira 19589a1e1bdSLuis Oliveira dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | 19689a1e1bdSLuis Oliveira DW_IC_CON_RESTART_EN; 19789a1e1bdSLuis Oliveira 1985b6d721bSLuis Oliveira dev->mode = DW_IC_MASTER; 1995b6d721bSLuis Oliveira 200e3ea52b5SAndy Shevchenko switch (t->bus_freq_hz) { 20189a1e1bdSLuis Oliveira case 100000: 20289a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_STD; 20389a1e1bdSLuis Oliveira break; 20489a1e1bdSLuis Oliveira case 3400000: 20589a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_HIGH; 20689a1e1bdSLuis Oliveira break; 20789a1e1bdSLuis Oliveira default: 20889a1e1bdSLuis Oliveira dev->master_cfg |= DW_IC_CON_SPEED_FAST; 20989a1e1bdSLuis Oliveira } 21089a1e1bdSLuis Oliveira } 21189a1e1bdSLuis Oliveira 2125b6d721bSLuis Oliveira static void i2c_dw_configure_slave(struct dw_i2c_dev *dev) 2135b6d721bSLuis Oliveira { 2145b6d721bSLuis Oliveira dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY; 2155b6d721bSLuis Oliveira 2165b6d721bSLuis Oliveira dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | 2174e2d93deSJarkko Nikula DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED; 2185b6d721bSLuis Oliveira 2195b6d721bSLuis Oliveira dev->mode = DW_IC_SLAVE; 220b33af11dSSuravee Suthikulpanit } 221b33af11dSSuravee Suthikulpanit 2228e598769STin Huynh static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id) 2238e598769STin Huynh { 2248e598769STin Huynh u32 param, tx_fifo_depth, rx_fifo_depth; 2258e598769STin Huynh 2268e598769STin Huynh /* 2278e598769STin Huynh * Try to detect the FIFO depth if not set by interface driver, 2288e598769STin Huynh * the depth could be from 2 to 256 from HW spec. 2298e598769STin Huynh */ 2308e598769STin Huynh param = i2c_dw_read_comp_param(dev); 2318e598769STin Huynh tx_fifo_depth = ((param >> 16) & 0xff) + 1; 2328e598769STin Huynh rx_fifo_depth = ((param >> 8) & 0xff) + 1; 2338e598769STin Huynh if (!dev->tx_fifo_depth) { 2348e598769STin Huynh dev->tx_fifo_depth = tx_fifo_depth; 2358e598769STin Huynh dev->rx_fifo_depth = rx_fifo_depth; 2368e598769STin Huynh dev->adapter.nr = id; 2378e598769STin Huynh } else if (tx_fifo_depth >= 2) { 2388e598769STin Huynh dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth, 2398e598769STin Huynh tx_fifo_depth); 2408e598769STin Huynh dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth, 2418e598769STin Huynh rx_fifo_depth); 2428e598769STin Huynh } 2438e598769STin Huynh } 2448e598769STin Huynh 245126dbc6bSRafael J. Wysocki static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev) 246126dbc6bSRafael J. Wysocki { 247126dbc6bSRafael J. Wysocki pm_runtime_disable(dev->dev); 248126dbc6bSRafael J. Wysocki 2499cbeeca0SHans de Goede if (dev->shared_with_punit) 250126dbc6bSRafael J. Wysocki pm_runtime_put_noidle(dev->dev); 251126dbc6bSRafael J. Wysocki } 252126dbc6bSRafael J. Wysocki 2536ad6fde3SJarkko Nikula static int dw_i2c_plat_probe(struct platform_device *pdev) 2542373f6b9SDirk Brandewie { 2554c5301abSMika Westerberg struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev); 2562373f6b9SDirk Brandewie struct i2c_adapter *adap; 257e393f674SLuis Oliveira struct dw_i2c_dev *dev; 258e3ea52b5SAndy Shevchenko struct i2c_timings *t; 259e3ea52b5SAndy Shevchenko u32 acpi_speed; 260e393f674SLuis Oliveira struct resource *mem; 261231d069fSHans de Goede int i, irq, ret; 2624ce8e88fSColin Ian King static const int supported_speeds[] = { 2634ce8e88fSColin Ian King 0, 100000, 400000, 1000000, 3400000 2644ce8e88fSColin Ian King }; 2652373f6b9SDirk Brandewie 2662373f6b9SDirk Brandewie irq = platform_get_irq(pdev, 0); 267b20d3864SAlexey Brodkin if (irq < 0) 268b20d3864SAlexey Brodkin return irq; 2692373f6b9SDirk Brandewie 2701cb715caSAndy Shevchenko dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); 2711cb715caSAndy Shevchenko if (!dev) 2721cb715caSAndy Shevchenko return -ENOMEM; 2732373f6b9SDirk Brandewie 2743cc2d009SWolfram Sang mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2751cb715caSAndy Shevchenko dev->base = devm_ioremap_resource(&pdev->dev, mem); 2761cb715caSAndy Shevchenko if (IS_ERR(dev->base)) 2771cb715caSAndy Shevchenko return PTR_ERR(dev->base); 2782373f6b9SDirk Brandewie 2791cb715caSAndy Shevchenko dev->dev = &pdev->dev; 2802373f6b9SDirk Brandewie dev->irq = irq; 2812373f6b9SDirk Brandewie platform_set_drvdata(pdev, dev); 2822373f6b9SDirk Brandewie 283ab809fd8SZhangfei Gao dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); 284ab809fd8SZhangfei Gao if (IS_ERR(dev->rst)) { 285ab809fd8SZhangfei Gao if (PTR_ERR(dev->rst) == -EPROBE_DEFER) 286ab809fd8SZhangfei Gao return -EPROBE_DEFER; 287ab809fd8SZhangfei Gao } else { 288ab809fd8SZhangfei Gao reset_control_deassert(dev->rst); 289ab809fd8SZhangfei Gao } 290ab809fd8SZhangfei Gao 291e3ea52b5SAndy Shevchenko t = &dev->timings; 292e3ea52b5SAndy Shevchenko if (pdata) 293e3ea52b5SAndy Shevchenko t->bus_freq_hz = pdata->i2c_scl_freq; 294e3ea52b5SAndy Shevchenko else 295e3ea52b5SAndy Shevchenko i2c_parse_fw_timings(&pdev->dev, t, false); 2968e5f6b2aSRomain Baeriswyl 29710f8e7fbSJarkko Nikula acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); 298231d069fSHans de Goede /* 299231d069fSHans de Goede * Some DSTDs use a non standard speed, round down to the lowest 300231d069fSHans de Goede * standard speed. 301231d069fSHans de Goede */ 302231d069fSHans de Goede for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) { 303231d069fSHans de Goede if (acpi_speed < supported_speeds[i]) 304231d069fSHans de Goede break; 305231d069fSHans de Goede } 306231d069fSHans de Goede acpi_speed = supported_speeds[i - 1]; 307231d069fSHans de Goede 308973652dbSJarkko Nikula /* 309973652dbSJarkko Nikula * Find bus speed from the "clock-frequency" device property, ACPI 310973652dbSJarkko Nikula * or by using fast mode if neither is set. 311973652dbSJarkko Nikula */ 312e3ea52b5SAndy Shevchenko if (acpi_speed && t->bus_freq_hz) 313e3ea52b5SAndy Shevchenko t->bus_freq_hz = min(t->bus_freq_hz, acpi_speed); 314e3ea52b5SAndy Shevchenko else if (acpi_speed || t->bus_freq_hz) 315e3ea52b5SAndy Shevchenko t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed); 316973652dbSJarkko Nikula else 317e3ea52b5SAndy Shevchenko t->bus_freq_hz = 400000; 31810f8e7fbSJarkko Nikula 3191732c22aSAlexandre Belloni dev->flags |= (uintptr_t)device_get_match_data(&pdev->dev); 3201732c22aSAlexandre Belloni 3211bb39959SAlexandre Belloni if (pdev->dev.of_node) 3221bb39959SAlexandre Belloni dw_i2c_of_configure(pdev); 3231bb39959SAlexandre Belloni 3244c5301abSMika Westerberg if (has_acpi_companion(&pdev->dev)) 3254c5301abSMika Westerberg dw_i2c_acpi_configure(pdev); 3264c5301abSMika Westerberg 3274c5301abSMika Westerberg /* 328d608c3d9SWeifeng Voon * Only standard mode at 100kHz, fast mode at 400kHz, 329b6e67145SWeifeng Voon * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported. 3308e5f6b2aSRomain Baeriswyl */ 331e3ea52b5SAndy Shevchenko if (t->bus_freq_hz != 100000 && t->bus_freq_hz != 400000 && 332e3ea52b5SAndy Shevchenko t->bus_freq_hz != 1000000 && t->bus_freq_hz != 3400000) { 333d608c3d9SWeifeng Voon dev_err(&pdev->dev, 33422acc37bSHans de Goede "%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n", 335e3ea52b5SAndy Shevchenko t->bus_freq_hz); 336e393f674SLuis Oliveira ret = -EINVAL; 337ab809fd8SZhangfei Gao goto exit_reset; 3388e5f6b2aSRomain Baeriswyl } 3399803f868SChristian Ruppert 340e393f674SLuis Oliveira ret = i2c_dw_probe_lock_support(dev); 341e393f674SLuis Oliveira if (ret) 342ab809fd8SZhangfei Gao goto exit_reset; 343894acb2fSDavid Box 3445b6d721bSLuis Oliveira if (i2c_detect_slave_mode(&pdev->dev)) 3455b6d721bSLuis Oliveira i2c_dw_configure_slave(dev); 3465b6d721bSLuis Oliveira else 34789a1e1bdSLuis Oliveira i2c_dw_configure_master(dev); 3482fa8326bSDirk Brandewie 349925ddb24SMika Westerberg dev->clk = devm_clk_get(&pdev->dev, NULL); 3500326f9f8SPhil Reid if (!i2c_dw_prepare_clk(dev, true)) { 351e3ea52b5SAndy Shevchenko u64 clk_khz; 352925ddb24SMika Westerberg 353e3ea52b5SAndy Shevchenko dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; 354e3ea52b5SAndy Shevchenko clk_khz = dev->get_clk_rate_khz(dev); 355e3ea52b5SAndy Shevchenko 356e3ea52b5SAndy Shevchenko if (!dev->sda_hold_time && t->sda_hold_ns) 357e3ea52b5SAndy Shevchenko dev->sda_hold_time = 358e3ea52b5SAndy Shevchenko div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000); 359925ddb24SMika Westerberg } 360925ddb24SMika Westerberg 3618e598769STin Huynh dw_i2c_set_fifo_size(dev, pdev->id); 3622373f6b9SDirk Brandewie 3632373f6b9SDirk Brandewie adap = &dev->adapter; 3642373f6b9SDirk Brandewie adap->owner = THIS_MODULE; 36570fba830SWolfram Sang adap->class = I2C_CLASS_DEPRECATED; 3668eb5c87aSDustin Byford ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); 367af71100cSRob Herring adap->dev.of_node = pdev->dev.of_node; 3682373f6b9SDirk Brandewie 36902e45646SRafael J. Wysocki dev_pm_set_driver_flags(&pdev->dev, 37002e45646SRafael J. Wysocki DPM_FLAG_SMART_PREPARE | 37102e45646SRafael J. Wysocki DPM_FLAG_SMART_SUSPEND | 37202e45646SRafael J. Wysocki DPM_FLAG_LEAVE_SUSPENDED); 373422cb781SRafael J. Wysocki 374126dbc6bSRafael J. Wysocki /* The code below assumes runtime PM to be disabled. */ 375126dbc6bSRafael J. Wysocki WARN_ON(pm_runtime_enabled(&pdev->dev)); 376126dbc6bSRafael J. Wysocki 37743452335SMika Westerberg pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 37843452335SMika Westerberg pm_runtime_use_autosuspend(&pdev->dev); 3797272194eSMika Westerberg pm_runtime_set_active(&pdev->dev); 380126dbc6bSRafael J. Wysocki 3819cbeeca0SHans de Goede if (dev->shared_with_punit) 382126dbc6bSRafael J. Wysocki pm_runtime_get_noresume(&pdev->dev); 383126dbc6bSRafael J. Wysocki 3847272194eSMika Westerberg pm_runtime_enable(&pdev->dev); 3857272194eSMika Westerberg 3865b6d721bSLuis Oliveira if (dev->mode == DW_IC_SLAVE) 3875b6d721bSLuis Oliveira ret = i2c_dw_probe_slave(dev); 3885b6d721bSLuis Oliveira else 389e393f674SLuis Oliveira ret = i2c_dw_probe(dev); 3905b6d721bSLuis Oliveira 391e393f674SLuis Oliveira if (ret) 392ab809fd8SZhangfei Gao goto exit_probe; 39336d48fb5SWolfram Sang 394e393f674SLuis Oliveira return ret; 395ab809fd8SZhangfei Gao 396ab809fd8SZhangfei Gao exit_probe: 397126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 398ab809fd8SZhangfei Gao exit_reset: 399ab809fd8SZhangfei Gao if (!IS_ERR_OR_NULL(dev->rst)) 400ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 401e393f674SLuis Oliveira return ret; 4022373f6b9SDirk Brandewie } 4032373f6b9SDirk Brandewie 4046ad6fde3SJarkko Nikula static int dw_i2c_plat_remove(struct platform_device *pdev) 4052373f6b9SDirk Brandewie { 4062373f6b9SDirk Brandewie struct dw_i2c_dev *dev = platform_get_drvdata(pdev); 4072373f6b9SDirk Brandewie 4087272194eSMika Westerberg pm_runtime_get_sync(&pdev->dev); 4097272194eSMika Westerberg 4102373f6b9SDirk Brandewie i2c_del_adapter(&dev->adapter); 4112373f6b9SDirk Brandewie 41290312351SLuis Oliveira dev->disable(dev); 4132373f6b9SDirk Brandewie 414edfc3901SMika Westerberg pm_runtime_dont_use_autosuspend(&pdev->dev); 415edfc3901SMika Westerberg pm_runtime_put_sync(&pdev->dev); 416126dbc6bSRafael J. Wysocki dw_i2c_plat_pm_cleanup(dev); 417126dbc6bSRafael J. Wysocki 418ab809fd8SZhangfei Gao if (!IS_ERR_OR_NULL(dev->rst)) 419ab809fd8SZhangfei Gao reset_control_assert(dev->rst); 4207272194eSMika Westerberg 421086cb4afSHans de Goede i2c_dw_remove_lock_support(dev); 422086cb4afSHans de Goede 4232373f6b9SDirk Brandewie return 0; 4242373f6b9SDirk Brandewie } 4252373f6b9SDirk Brandewie 4268503ff16SJisheng Zhang #ifdef CONFIG_PM_SLEEP 4276ad6fde3SJarkko Nikula static int dw_i2c_plat_prepare(struct device *dev) 4288503ff16SJisheng Zhang { 429422cb781SRafael J. Wysocki /* 430422cb781SRafael J. Wysocki * If the ACPI companion device object is present for this device, it 431422cb781SRafael J. Wysocki * may be accessed during suspend and resume of other devices via I2C 432422cb781SRafael J. Wysocki * operation regions, so tell the PM core and middle layers to avoid 433422cb781SRafael J. Wysocki * skipping system suspend/resume callbacks for it in that case. 434422cb781SRafael J. Wysocki */ 435422cb781SRafael J. Wysocki return !has_acpi_companion(dev); 4368503ff16SJisheng Zhang } 4378503ff16SJisheng Zhang 4386ad6fde3SJarkko Nikula static void dw_i2c_plat_complete(struct device *dev) 4398503ff16SJisheng Zhang { 44002e45646SRafael J. Wysocki /* 44102e45646SRafael J. Wysocki * The device can only be in runtime suspend at this point if it has not 44202e45646SRafael J. Wysocki * been resumed throughout the ending system suspend/resume cycle, so if 44302e45646SRafael J. Wysocki * the platform firmware might mess up with it, request the runtime PM 44402e45646SRafael J. Wysocki * framework to resume it. 44502e45646SRafael J. Wysocki */ 44602e45646SRafael J. Wysocki if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) 4478503ff16SJisheng Zhang pm_request_resume(dev); 4488503ff16SJisheng Zhang } 4498503ff16SJisheng Zhang #else 450319d7f05SJarkko Nikula #define dw_i2c_plat_prepare NULL 451319d7f05SJarkko Nikula #define dw_i2c_plat_complete NULL 4528503ff16SJisheng Zhang #endif 4538503ff16SJisheng Zhang 4541fc2fe20SMika Westerberg #ifdef CONFIG_PM 45554152772SRafael J. Wysocki static int dw_i2c_plat_suspend(struct device *dev) 4563bf3b289SDeepak Sikri { 4579242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 4583bf3b289SDeepak Sikri 4599cbeeca0SHans de Goede if (i_dev->shared_with_punit) 4609d9a152eSHans de Goede return 0; 4619d9a152eSHans de Goede 46290312351SLuis Oliveira i_dev->disable(i_dev); 4630326f9f8SPhil Reid i2c_dw_prepare_clk(i_dev, false); 4643bf3b289SDeepak Sikri 4653bf3b289SDeepak Sikri return 0; 4663bf3b289SDeepak Sikri } 4673bf3b289SDeepak Sikri 4686ad6fde3SJarkko Nikula static int dw_i2c_plat_resume(struct device *dev) 4693bf3b289SDeepak Sikri { 4709242e72aSMasahiro Yamada struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 4713bf3b289SDeepak Sikri 4729cbeeca0SHans de Goede if (!i_dev->shared_with_punit) 4730326f9f8SPhil Reid i2c_dw_prepare_clk(i_dev, true); 4749d9a152eSHans de Goede 47590312351SLuis Oliveira i_dev->init(i_dev); 4763bf3b289SDeepak Sikri 4773bf3b289SDeepak Sikri return 0; 4783bf3b289SDeepak Sikri } 4793bf3b289SDeepak Sikri 4808503ff16SJisheng Zhang static const struct dev_pm_ops dw_i2c_dev_pm_ops = { 4816ad6fde3SJarkko Nikula .prepare = dw_i2c_plat_prepare, 4826ad6fde3SJarkko Nikula .complete = dw_i2c_plat_complete, 48354152772SRafael J. Wysocki SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume) 48454152772SRafael J. Wysocki SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) 4858503ff16SJisheng Zhang }; 4868503ff16SJisheng Zhang 4878503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) 4888503ff16SJisheng Zhang #else 4898503ff16SJisheng Zhang #define DW_I2C_DEV_PMOPS NULL 4908503ff16SJisheng Zhang #endif 4911fc2fe20SMika Westerberg 492e393f674SLuis Oliveira /* Work with hotplug and coldplug */ 4932373f6b9SDirk Brandewie MODULE_ALIAS("platform:i2c_designware"); 4942373f6b9SDirk Brandewie 4952373f6b9SDirk Brandewie static struct platform_driver dw_i2c_driver = { 4966ad6fde3SJarkko Nikula .probe = dw_i2c_plat_probe, 4976ad6fde3SJarkko Nikula .remove = dw_i2c_plat_remove, 4982373f6b9SDirk Brandewie .driver = { 4992373f6b9SDirk Brandewie .name = "i2c_designware", 500af71100cSRob Herring .of_match_table = of_match_ptr(dw_i2c_of_match), 501b61b1415SMika Westerberg .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), 5028503ff16SJisheng Zhang .pm = DW_I2C_DEV_PMOPS, 5032373f6b9SDirk Brandewie }, 5042373f6b9SDirk Brandewie }; 5052373f6b9SDirk Brandewie 5062373f6b9SDirk Brandewie static int __init dw_i2c_init_driver(void) 5072373f6b9SDirk Brandewie { 508cccdcea1SWolfram Sang return platform_driver_register(&dw_i2c_driver); 5092373f6b9SDirk Brandewie } 51010452280SPratyush Anand subsys_initcall(dw_i2c_init_driver); 5112373f6b9SDirk Brandewie 5122373f6b9SDirk Brandewie static void __exit dw_i2c_exit_driver(void) 5132373f6b9SDirk Brandewie { 5142373f6b9SDirk Brandewie platform_driver_unregister(&dw_i2c_driver); 5152373f6b9SDirk Brandewie } 5162373f6b9SDirk Brandewie module_exit(dw_i2c_exit_driver); 5172373f6b9SDirk Brandewie 5182373f6b9SDirk Brandewie MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); 5192373f6b9SDirk Brandewie MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter"); 5202373f6b9SDirk Brandewie MODULE_LICENSE("GPL"); 521