v4.19.13 snapshot.
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
new file mode 100644
index 0000000..b5750fd
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Synopsys DesignWare I2C adapter driver.
+ *
+ * Based on the TI DAVINCI I2C adapter driver.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ * Copyright (C) 2007 MontaVista Software Inc.
+ * Copyright (C) 2009 Provigent Ltd.
+ */
+#include <linux/acpi.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/i2c-designware.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+
+#include "i2c-designware-core.h"
+
+static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
+{
+ return clk_get_rate(dev->clk)/1000;
+}
+
+#ifdef CONFIG_ACPI
+/*
+ * The HCNT/LCNT information coming from ACPI should be the most accurate
+ * for given platform. However, some systems get it wrong. On such systems
+ * we get better results by calculating those based on the input clock.
+ */
+static const struct dmi_system_id dw_i2c_no_acpi_params[] = {
+ {
+ .ident = "Dell Inspiron 7348",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"),
+ },
+ },
+ { }
+};
+
+static void dw_i2c_acpi_params(struct platform_device *pdev, char method[],
+ u16 *hcnt, u16 *lcnt, u32 *sda_hold)
+{
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
+ union acpi_object *obj;
+
+ if (dmi_check_system(dw_i2c_no_acpi_params))
+ return;
+
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf)))
+ return;
+
+ obj = (union acpi_object *)buf.pointer;
+ if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) {
+ const union acpi_object *objs = obj->package.elements;
+
+ *hcnt = (u16)objs[0].integer.value;
+ *lcnt = (u16)objs[1].integer.value;
+ *sda_hold = (u32)objs[2].integer.value;
+ }
+
+ kfree(buf.pointer);
+}
+
+static int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+ struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+ struct i2c_timings *t = &dev->timings;
+ u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0;
+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
+ const struct acpi_device_id *id;
+ struct acpi_device *adev;
+ const char *uid;
+
+ dev->adapter.nr = -1;
+ dev->tx_fifo_depth = 32;
+ dev->rx_fifo_depth = 32;
+
+ /*
+ * Try to get SDA hold time and *CNT values from an ACPI method for
+ * selected speed modes.
+ */
+ dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, &ss_ht);
+ dw_i2c_acpi_params(pdev, "FPCN", &dev->fp_hcnt, &dev->fp_lcnt, &fp_ht);
+ dw_i2c_acpi_params(pdev, "HSCN", &dev->hs_hcnt, &dev->hs_lcnt, &hs_ht);
+ dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, &fs_ht);
+
+ switch (t->bus_freq_hz) {
+ case 100000:
+ dev->sda_hold_time = ss_ht;
+ break;
+ case 1000000:
+ dev->sda_hold_time = fp_ht;
+ break;
+ case 3400000:
+ dev->sda_hold_time = hs_ht;
+ break;
+ case 400000:
+ default:
+ dev->sda_hold_time = fs_ht;
+ break;
+ }
+
+ id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
+ if (id && id->driver_data)
+ dev->flags |= (u32)id->driver_data;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return -ENODEV;
+
+ /*
+ * Cherrytrail I2C7 gets used for the PMIC which gets accessed
+ * through ACPI opregions during late suspend / early resume
+ * disable pm for it.
+ */
+ uid = adev->pnp.unique_id;
+ if ((dev->flags & MODEL_CHERRYTRAIL) && !strcmp(uid, "7"))
+ dev->pm_disabled = true;
+
+ return 0;
+}
+
+static const struct acpi_device_id dw_i2c_acpi_match[] = {
+ { "INT33C2", 0 },
+ { "INT33C3", 0 },
+ { "INT3432", 0 },
+ { "INT3433", 0 },
+ { "80860F41", 0 },
+ { "808622C1", MODEL_CHERRYTRAIL },
+ { "AMD0010", ACCESS_INTR_MASK },
+ { "AMDI0010", ACCESS_INTR_MASK },
+ { "AMDI0510", 0 },
+ { "APMC0D0F", 0 },
+ { "HISI02A1", 0 },
+ { "HISI02A2", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
+#else
+static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
+{
+ return -ENODEV;
+}
+#endif
+
+static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
+{
+ struct i2c_timings *t = &dev->timings;
+
+ dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
+
+ dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
+ DW_IC_CON_RESTART_EN;
+
+ dev->mode = DW_IC_MASTER;
+
+ switch (t->bus_freq_hz) {
+ case 100000:
+ dev->master_cfg |= DW_IC_CON_SPEED_STD;
+ break;
+ case 3400000:
+ dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
+ break;
+ default:
+ dev->master_cfg |= DW_IC_CON_SPEED_FAST;
+ }
+}
+
+static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
+{
+ dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY;
+
+ dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL |
+ DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED;
+
+ dev->mode = DW_IC_SLAVE;
+}
+
+static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
+{
+ u32 param, tx_fifo_depth, rx_fifo_depth;
+
+ /*
+ * Try to detect the FIFO depth if not set by interface driver,
+ * the depth could be from 2 to 256 from HW spec.
+ */
+ param = i2c_dw_read_comp_param(dev);
+ tx_fifo_depth = ((param >> 16) & 0xff) + 1;
+ rx_fifo_depth = ((param >> 8) & 0xff) + 1;
+ if (!dev->tx_fifo_depth) {
+ dev->tx_fifo_depth = tx_fifo_depth;
+ dev->rx_fifo_depth = rx_fifo_depth;
+ dev->adapter.nr = id;
+ } else if (tx_fifo_depth >= 2) {
+ dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
+ tx_fifo_depth);
+ dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth,
+ rx_fifo_depth);
+ }
+}
+
+static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
+{
+ pm_runtime_disable(dev->dev);
+
+ if (dev->pm_disabled)
+ pm_runtime_put_noidle(dev->dev);
+}
+
+static int dw_i2c_plat_probe(struct platform_device *pdev)
+{
+ struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct i2c_adapter *adap;
+ struct dw_i2c_dev *dev;
+ struct i2c_timings *t;
+ u32 acpi_speed;
+ struct resource *mem;
+ int i, irq, ret;
+ static const int supported_speeds[] = {
+ 0, 100000, 400000, 1000000, 3400000
+ };
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dev->base))
+ return PTR_ERR(dev->base);
+
+ dev->dev = &pdev->dev;
+ dev->irq = irq;
+ platform_set_drvdata(pdev, dev);
+
+ dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(dev->rst)) {
+ if (PTR_ERR(dev->rst) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ } else {
+ reset_control_deassert(dev->rst);
+ }
+
+ t = &dev->timings;
+ if (pdata)
+ t->bus_freq_hz = pdata->i2c_scl_freq;
+ else
+ i2c_parse_fw_timings(&pdev->dev, t, false);
+
+ acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
+ /*
+ * Some DSTDs use a non standard speed, round down to the lowest
+ * standard speed.
+ */
+ for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) {
+ if (acpi_speed < supported_speeds[i])
+ break;
+ }
+ acpi_speed = supported_speeds[i - 1];
+
+ /*
+ * Find bus speed from the "clock-frequency" device property, ACPI
+ * or by using fast mode if neither is set.
+ */
+ if (acpi_speed && t->bus_freq_hz)
+ t->bus_freq_hz = min(t->bus_freq_hz, acpi_speed);
+ else if (acpi_speed || t->bus_freq_hz)
+ t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed);
+ else
+ t->bus_freq_hz = 400000;
+
+ if (has_acpi_companion(&pdev->dev))
+ dw_i2c_acpi_configure(pdev);
+
+ /*
+ * Only standard mode at 100kHz, fast mode at 400kHz,
+ * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported.
+ */
+ if (t->bus_freq_hz != 100000 && t->bus_freq_hz != 400000 &&
+ t->bus_freq_hz != 1000000 && t->bus_freq_hz != 3400000) {
+ dev_err(&pdev->dev,
+ "%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n",
+ t->bus_freq_hz);
+ ret = -EINVAL;
+ goto exit_reset;
+ }
+
+ ret = i2c_dw_probe_lock_support(dev);
+ if (ret)
+ goto exit_reset;
+
+ if (i2c_detect_slave_mode(&pdev->dev))
+ i2c_dw_configure_slave(dev);
+ else
+ i2c_dw_configure_master(dev);
+
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
+ if (!i2c_dw_prepare_clk(dev, true)) {
+ u64 clk_khz;
+
+ dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
+ clk_khz = dev->get_clk_rate_khz(dev);
+
+ if (!dev->sda_hold_time && t->sda_hold_ns)
+ dev->sda_hold_time =
+ div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
+ }
+
+ dw_i2c_set_fifo_size(dev, pdev->id);
+
+ adap = &dev->adapter;
+ adap->owner = THIS_MODULE;
+ adap->class = I2C_CLASS_DEPRECATED;
+ ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
+ adap->dev.of_node = pdev->dev.of_node;
+
+ dev_pm_set_driver_flags(&pdev->dev,
+ DPM_FLAG_SMART_PREPARE |
+ DPM_FLAG_SMART_SUSPEND |
+ DPM_FLAG_LEAVE_SUSPENDED);
+
+ /* The code below assumes runtime PM to be disabled. */
+ WARN_ON(pm_runtime_enabled(&pdev->dev));
+
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+
+ if (dev->pm_disabled)
+ pm_runtime_get_noresume(&pdev->dev);
+
+ pm_runtime_enable(&pdev->dev);
+
+ if (dev->mode == DW_IC_SLAVE)
+ ret = i2c_dw_probe_slave(dev);
+ else
+ ret = i2c_dw_probe(dev);
+
+ if (ret)
+ goto exit_probe;
+
+ return ret;
+
+exit_probe:
+ dw_i2c_plat_pm_cleanup(dev);
+exit_reset:
+ if (!IS_ERR_OR_NULL(dev->rst))
+ reset_control_assert(dev->rst);
+ return ret;
+}
+
+static int dw_i2c_plat_remove(struct platform_device *pdev)
+{
+ struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+
+ pm_runtime_get_sync(&pdev->dev);
+
+ i2c_del_adapter(&dev->adapter);
+
+ dev->disable(dev);
+
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+ pm_runtime_put_sync(&pdev->dev);
+ dw_i2c_plat_pm_cleanup(dev);
+
+ if (!IS_ERR_OR_NULL(dev->rst))
+ reset_control_assert(dev->rst);
+
+ i2c_dw_remove_lock_support(dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id dw_i2c_of_match[] = {
+ { .compatible = "snps,designware-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+static int dw_i2c_plat_prepare(struct device *dev)
+{
+ /*
+ * If the ACPI companion device object is present for this device, it
+ * may be accessed during suspend and resume of other devices via I2C
+ * operation regions, so tell the PM core and middle layers to avoid
+ * skipping system suspend/resume callbacks for it in that case.
+ */
+ return !has_acpi_companion(dev);
+}
+
+static void dw_i2c_plat_complete(struct device *dev)
+{
+ /*
+ * The device can only be in runtime suspend at this point if it has not
+ * been resumed throughout the ending system suspend/resume cycle, so if
+ * the platform firmware might mess up with it, request the runtime PM
+ * framework to resume it.
+ */
+ if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
+ pm_request_resume(dev);
+}
+#else
+#define dw_i2c_plat_prepare NULL
+#define dw_i2c_plat_complete NULL
+#endif
+
+#ifdef CONFIG_PM
+static int dw_i2c_plat_suspend(struct device *dev)
+{
+ struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+ if (i_dev->pm_disabled)
+ return 0;
+
+ i_dev->disable(i_dev);
+ i2c_dw_prepare_clk(i_dev, false);
+
+ return 0;
+}
+
+static int dw_i2c_plat_resume(struct device *dev)
+{
+ struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+ if (!i_dev->pm_disabled)
+ i2c_dw_prepare_clk(i_dev, true);
+
+ i_dev->init(i_dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
+ .prepare = dw_i2c_plat_prepare,
+ .complete = dw_i2c_plat_complete,
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
+ SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL)
+};
+
+#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
+#else
+#define DW_I2C_DEV_PMOPS NULL
+#endif
+
+/* Work with hotplug and coldplug */
+MODULE_ALIAS("platform:i2c_designware");
+
+static struct platform_driver dw_i2c_driver = {
+ .probe = dw_i2c_plat_probe,
+ .remove = dw_i2c_plat_remove,
+ .driver = {
+ .name = "i2c_designware",
+ .of_match_table = of_match_ptr(dw_i2c_of_match),
+ .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),
+ .pm = DW_I2C_DEV_PMOPS,
+ },
+};
+
+static int __init dw_i2c_init_driver(void)
+{
+ return platform_driver_register(&dw_i2c_driver);
+}
+subsys_initcall(dw_i2c_init_driver);
+
+static void __exit dw_i2c_exit_driver(void)
+{
+ platform_driver_unregister(&dw_i2c_driver);
+}
+module_exit(dw_i2c_exit_driver);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter");
+MODULE_LICENSE("GPL");