diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-amdisp.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-amdisp.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-amdisp.c b/drivers/i2c/busses/i2c-designware-amdisp.c new file mode 100644 index 000000000000..450793d5f839 --- /dev/null +++ b/drivers/i2c/busses/i2c-designware-amdisp.c @@ -0,0 +1,207 @@ +// 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 <linux/soc/amd/isp4_misc.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; + scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME); + 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"); |