1 files changed, 510 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
new file mode 100644
index 000000000..855b698e9
--- /dev/null
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -0,0 +1,510 @@
+// 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/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/units.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) / KILO;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id dw_i2c_acpi_match[] = {
+	{ "INT33C2", 0 },
+	{ "INT33C3", 0 },
+	{ "INT3432", 0 },
+	{ "INT3433", 0 },
+	{ "80860F41", ACCESS_NO_IRQ_SUSPEND },
+	{ "808622C1", ACCESS_NO_IRQ_SUSPEND },
+	{ "AMD0010", ACCESS_INTR_MASK },
+	{ "AMDI0010", ACCESS_INTR_MASK },
+	{ "AMDI0019", ACCESS_INTR_MASK | ARBITRATION_SEMAPHORE },
+	{ "AMDI0510", 0 },
+	{ "APMC0D0F", 0 },
+	{ "HISI02A1", 0 },
+	{ "HISI02A2", 0 },
+	{ "HISI02A3", 0 },
+	{ "HYGO0010", ACCESS_INTR_MASK },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match);
+#endif
+
+#ifdef CONFIG_OF
+#define BT1_I2C_CTL			0x100
+#define BT1_I2C_CTL_ADDR_MASK		GENMASK(7, 0)
+#define BT1_I2C_CTL_WR			BIT(8)
+#define BT1_I2C_CTL_GO			BIT(31)
+#define BT1_I2C_DI			0x104
+#define BT1_I2C_DO			0x108
+
+static int bt1_i2c_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct dw_i2c_dev *dev = context;
+	int ret;
+
+	/*
+	 * Note these methods shouldn't ever fail because the system controller
+	 * registers are memory mapped. We check the return value just in case.
+	 */
+	ret = regmap_write(dev->sysmap, BT1_I2C_CTL,
+			   BT1_I2C_CTL_GO | (reg & BT1_I2C_CTL_ADDR_MASK));
+	if (ret)
+		return ret;
+
+	return regmap_read(dev->sysmap, BT1_I2C_DO, val);
+}
+
+static int bt1_i2c_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct dw_i2c_dev *dev = context;
+	int ret;
+
+	ret = regmap_write(dev->sysmap, BT1_I2C_DI, val);
+	if (ret)
+		return ret;
+
+	return regmap_write(dev->sysmap, BT1_I2C_CTL,
+		BT1_I2C_CTL_GO | BT1_I2C_CTL_WR | (reg & BT1_I2C_CTL_ADDR_MASK));
+}
+
+static struct regmap_config bt1_i2c_cfg = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.fast_io = true,
+	.reg_read = bt1_i2c_read,
+	.reg_write = bt1_i2c_write,
+	.max_register = DW_IC_COMP_TYPE,
+};
+
+static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
+{
+	dev->sysmap = syscon_node_to_regmap(dev->dev->of_node->parent);
+	if (IS_ERR(dev->sysmap))
+		return PTR_ERR(dev->sysmap);
+
+	dev->map = devm_regmap_init(dev->dev, NULL, dev, &bt1_i2c_cfg);
+	return PTR_ERR_OR_ZERO(dev->map);
+}
+
+#define MSCC_ICPU_CFG_TWI_DELAY		0x0
+#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE	BIT(0)
+#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER	0x4
+
+static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
+{
+	writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
+	       dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
+
+	return 0;
+}
+
+static int dw_i2c_of_configure(struct platform_device *pdev)
+{
+	struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
+
+	switch (dev->flags & MODEL_MASK) {
+	case MODEL_MSCC_OCELOT:
+		dev->ext = devm_platform_ioremap_resource(pdev, 1);
+		if (!IS_ERR(dev->ext))
+			dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id dw_i2c_of_match[] = {
+	{ .compatible = "snps,designware-i2c", },
+	{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
+	{ .compatible = "baikal,bt1-sys-i2c", .data = (void *)MODEL_BAIKAL_BT1 },
+	{},
+};
+MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
+#else
+static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
+{
+	return -ENODEV;
+}
+
+static inline int dw_i2c_of_configure(struct platform_device *pdev)
+{
+	return -ENODEV;
+}
+#endif
+
+static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
+{
+	dev->map = dev_get_regmap(dev->dev->parent, NULL);
+	if (!dev->map)
+		return -ENODEV;
+
+	return 0;
+}
+
+static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
+{
+	pm_runtime_disable(dev->dev);
+
+	if (dev->shared_with_punit)
+		pm_runtime_put_noidle(dev->dev);
+}
+
+static int dw_i2c_plat_request_regs(struct dw_i2c_dev *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev->dev);
+	int ret;
+
+	switch (dev->flags & MODEL_MASK) {
+	case MODEL_BAIKAL_BT1:
+		ret = bt1_i2c_request_regs(dev);
+		break;
+	case MODEL_WANGXUN_SP:
+		ret = txgbe_i2c_request_regs(dev);
+		break;
+	default:
+		dev->base = devm_platform_ioremap_resource(pdev, 0);
+		ret = PTR_ERR_OR_ZERO(dev->base);
+		break;
+	}
+
+	return ret;
+}
+
+static const struct dmi_system_id dw_i2c_hwmon_class_dmi[] = {
+	{
+		.ident = "Qtechnology QT5222",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Qtechnology"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "QT5222"),
+		},
+	},
+	{ } /* terminate list */
+};
+
+static const struct i2c_dw_semaphore_callbacks i2c_dw_semaphore_cb_table[] = {
+#ifdef CONFIG_I2C_DESIGNWARE_BAYTRAIL
+	{
+		.probe = i2c_dw_baytrail_probe_lock_support,
+	},
+#endif
+#ifdef CONFIG_I2C_DESIGNWARE_AMDPSP
+	{
+		.probe = i2c_dw_amdpsp_probe_lock_support,
+	},
+#endif
+	{}
+};
+
+static int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
+{
+	const struct i2c_dw_semaphore_callbacks *ptr;
+	int i = 0;
+	int ret;
+
+	ptr = i2c_dw_semaphore_cb_table;
+
+	dev->semaphore_idx = -1;
+
+	while (ptr->probe) {
+		ret = ptr->probe(dev);
+		if (ret) {
+			/*
+			 * If there is no semaphore device attached to this
+			 * controller, we shouldn't abort general i2c_controller
+			 * probe.
+			 */
+			if (ret != -ENODEV)
+				return ret;
+
+			i++;
+			ptr++;
+			continue;
+		}
+
+		dev->semaphore_idx = i;
+		break;
+	}
+
+	return 0;
+}
+
+static void i2c_dw_remove_lock_support(struct dw_i2c_dev *dev)
+{
+	if (dev->semaphore_idx < 0)
+		return;
+
+	if (i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove)
+		i2c_dw_semaphore_cb_table[dev->semaphore_idx].remove(dev);
+}
+
+static int dw_i2c_plat_probe(struct platform_device *pdev)
+{
+	struct i2c_adapter *adap;
+	struct dw_i2c_dev *dev;
+	struct i2c_timings *t;
+	int irq, ret;
+
+	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;
+
+	dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
+	if (device_property_present(&pdev->dev, "wx,i2c-snps-model"))
+		dev->flags = MODEL_WANGXUN_SP;
+
+	dev->dev = &pdev->dev;
+	dev->irq = irq;
+	platform_set_drvdata(pdev, dev);
+
+	ret = dw_i2c_plat_request_regs(dev);
+	if (ret)
+		return ret;
+
+	dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(dev->rst))
+		return PTR_ERR(dev->rst);
+
+	reset_control_deassert(dev->rst);
+
+	t = &dev->timings;
+	i2c_parse_fw_timings(&pdev->dev, t, false);
+
+	i2c_dw_adjust_bus_speed(dev);
+
+	if (pdev->dev.of_node)
+		dw_i2c_of_configure(pdev);
+
+	if (has_acpi_companion(&pdev->dev))
+		i2c_dw_acpi_configure(&pdev->dev);
+
+	ret = i2c_dw_validate_speed(dev);
+	if (ret)
+		goto exit_reset;
+
+	ret = i2c_dw_probe_lock_support(dev);
+	if (ret)
+		goto exit_reset;
+
+	i2c_dw_configure(dev);
+
+	/* Optional interface clock */
+	dev->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
+	if (IS_ERR(dev->pclk)) {
+		ret = PTR_ERR(dev->pclk);
+		goto exit_reset;
+	}
+
+	dev->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk)) {
+		ret = PTR_ERR(dev->clk);
+		goto exit_reset;
+	}
+
+	ret = i2c_dw_prepare_clk(dev, true);
+	if (ret)
+		goto exit_reset;
+
+	if (dev->clk) {
+		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_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);
+	}
+
+	adap = &dev->adapter;
+	adap->owner = THIS_MODULE;
+	adap->class = dmi_check_system(dw_i2c_hwmon_class_dmi) ?
+					I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED;
+	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
+	adap->dev.of_node = pdev->dev.of_node;
+	adap->nr = -1;
+
+	if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
+		dev_pm_set_driver_flags(&pdev->dev,
+					DPM_FLAG_SMART_PREPARE);
+	} else {
+		dev_pm_set_driver_flags(&pdev->dev,
+					DPM_FLAG_SMART_PREPARE |
+					DPM_FLAG_SMART_SUSPEND);
+	}
+
+	device_enable_async_suspend(&pdev->dev);
+
+	/* 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->shared_with_punit)
+		pm_runtime_get_noresume(&pdev->dev);
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = i2c_dw_probe(dev);
+	if (ret)
+		goto exit_probe;
+
+	return ret;
+
+exit_probe:
+	dw_i2c_plat_pm_cleanup(dev);
+exit_reset:
+	reset_control_assert(dev->rst);
+	return ret;
+}
+
+static void 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);
+
+	i2c_dw_remove_lock_support(dev);
+
+	reset_control_assert(dev->rst);
+}
+
+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 int dw_i2c_plat_runtime_suspend(struct device *dev)
+{
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+	if (i_dev->shared_with_punit)
+		return 0;
+
+	i_dev->disable(i_dev);
+	i2c_dw_prepare_clk(i_dev, false);
+
+	return 0;
+}
+
+static int dw_i2c_plat_suspend(struct device *dev)
+{
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_suspended(&i_dev->adapter);
+
+	return dw_i2c_plat_runtime_suspend(dev);
+}
+
+static int dw_i2c_plat_runtime_resume(struct device *dev)
+{
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+	if (!i_dev->shared_with_punit)
+		i2c_dw_prepare_clk(i_dev, true);
+
+	i_dev->init(i_dev);
+
+	return 0;
+}
+
+static int dw_i2c_plat_resume(struct device *dev)
+{
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+	dw_i2c_plat_runtime_resume(dev);
+	i2c_mark_adapter_resumed(&i_dev->adapter);
+
+	return 0;
+}
+
+static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
+	.prepare = pm_sleep_ptr(dw_i2c_plat_prepare),
+	LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
+	RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend, dw_i2c_plat_runtime_resume, NULL)
+};
+
+/* Work with hotplug and coldplug */
+MODULE_ALIAS("platform:i2c_designware");
+
+static struct platform_driver dw_i2c_driver = {
+	.probe = dw_i2c_plat_probe,
+	.remove_new = 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	= pm_ptr(&dw_i2c_dev_pm_ops),
+	},
+};
+
+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");