--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Based on Synopsys DesignWare I2C adapter driver.
+ *
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "i2c-designware-core.h"
+
+#define DRV_NAME "amd_isp_i2c_designware"
+#define AMD_ISP_I2C_INPUT_CLK 100 /* Mhz */
+
+static void amd_isp_dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *i2c_dev)
+{
+ pm_runtime_disable(i2c_dev->dev);
+
+ if (i2c_dev->shared_with_punit)
+ pm_runtime_put_noidle(i2c_dev->dev);
+}
+
+static inline u32 amd_isp_dw_i2c_get_clk_rate(struct dw_i2c_dev *i2c_dev)
+{
+ return AMD_ISP_I2C_INPUT_CLK * 1000;
+}
+
+static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev)
+{
+ struct dw_i2c_dev *isp_i2c_dev;
+ struct i2c_adapter *adap;
+ int ret;
+
+ isp_i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c_dev), GFP_KERNEL);
+ if (!isp_i2c_dev)
+ return -ENOMEM;
+ isp_i2c_dev->dev = &pdev->dev;
+
+ pdev->dev.init_name = DRV_NAME;
+
+ /*
+ * Use the polling mode to send/receive the data, because
+ * no IRQ connection from ISP I2C
+ */
+ isp_i2c_dev->flags |= ACCESS_POLLING;
+ platform_set_drvdata(pdev, isp_i2c_dev);
+
+ isp_i2c_dev->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(isp_i2c_dev->base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(isp_i2c_dev->base),
+ "failed to get IOMEM resource\n");
+
+ isp_i2c_dev->get_clk_rate_khz = amd_isp_dw_i2c_get_clk_rate;
+ ret = i2c_dw_fw_parse_and_configure(isp_i2c_dev);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to parse i2c dw fwnode and configure\n");
+
+ i2c_dw_configure(isp_i2c_dev);
+
+ adap = &isp_i2c_dev->adapter;
+ adap->owner = THIS_MODULE;
+ ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
+ adap->dev.of_node = pdev->dev.of_node;
+ /* use dynamically allocated adapter id */
+ adap->nr = -1;
+
+ if (isp_i2c_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);
+
+ if (isp_i2c_dev->shared_with_punit)
+ pm_runtime_get_noresume(&pdev->dev);
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ ret = i2c_dw_probe(isp_i2c_dev);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "i2c_dw_probe failed\n");
+ goto error_release_rpm;
+ }
+
+ pm_runtime_put_sync(&pdev->dev);
+
+ return 0;
+
+error_release_rpm:
+ amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev);
+ pm_runtime_put_sync(&pdev->dev);
+ return ret;
+}
+
+static void amd_isp_dw_i2c_plat_remove(struct platform_device *pdev)
+{
+ struct dw_i2c_dev *isp_i2c_dev = platform_get_drvdata(pdev);
+
+ pm_runtime_get_sync(&pdev->dev);
+
+ i2c_del_adapter(&isp_i2c_dev->adapter);
+
+ i2c_dw_disable(isp_i2c_dev);
+
+ pm_runtime_put_sync(&pdev->dev);
+ amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev);
+}
+
+static int amd_isp_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 amd_isp_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;
+
+ i2c_dw_disable(i_dev);
+ i2c_dw_prepare_clk(i_dev, false);
+
+ return 0;
+}
+
+static int amd_isp_dw_i2c_plat_suspend(struct device *dev)
+{
+ struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+ int ret;
+
+ if (!i_dev)
+ return -ENODEV;
+
+ ret = amd_isp_dw_i2c_plat_runtime_suspend(dev);
+ if (!ret)
+ i2c_mark_adapter_suspended(&i_dev->adapter);
+
+ return ret;
+}
+
+static int amd_isp_dw_i2c_plat_runtime_resume(struct device *dev)
+{
+ struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+ if (!i_dev)
+ return -ENODEV;
+
+ if (!i_dev->shared_with_punit)
+ i2c_dw_prepare_clk(i_dev, true);
+ if (i_dev->init)
+ i_dev->init(i_dev);
+
+ return 0;
+}
+
+static int amd_isp_dw_i2c_plat_resume(struct device *dev)
+{
+ struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
+
+ amd_isp_dw_i2c_plat_runtime_resume(dev);
+ i2c_mark_adapter_resumed(&i_dev->adapter);
+
+ return 0;
+}
+
+static const struct dev_pm_ops amd_isp_dw_i2c_dev_pm_ops = {
+ .prepare = pm_sleep_ptr(amd_isp_dw_i2c_plat_prepare),
+ LATE_SYSTEM_SLEEP_PM_OPS(amd_isp_dw_i2c_plat_suspend, amd_isp_dw_i2c_plat_resume)
+ RUNTIME_PM_OPS(amd_isp_dw_i2c_plat_runtime_suspend, amd_isp_dw_i2c_plat_runtime_resume, NULL)
+};
+
+/* Work with hotplug and coldplug */
+MODULE_ALIAS("platform:amd_isp_i2c_designware");
+
+static struct platform_driver amd_isp_dw_i2c_driver = {
+ .probe = amd_isp_dw_i2c_plat_probe,
+ .remove = amd_isp_dw_i2c_plat_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .pm = pm_ptr(&amd_isp_dw_i2c_dev_pm_ops),
+ },
+};
+module_platform_driver(amd_isp_dw_i2c_driver);
+
+MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter in AMD ISP");
+MODULE_IMPORT_NS("I2C_DW");
+MODULE_IMPORT_NS("I2C_DW_COMMON");
+MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vengutta@amd.com>");
+MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@amd.com>");
+MODULE_AUTHOR("Bin Du <bin.du@amd.com>");
+MODULE_LICENSE("GPL");
projects / thirdparty / linux.git / commitdiff
