1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Based on Synopsys DesignWare I2C adapter driver. 4 * 5 * Copyright (C) 2025 Advanced Micro Devices, Inc. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/platform_device.h> 10 #include <linux/pm_domain.h> 11 #include <linux/pm_runtime.h> 12 #include <linux/soc/amd/isp4_misc.h> 13 14 #include "i2c-designware-core.h" 15 16 #define DRV_NAME "amd_isp_i2c_designware" 17 #define AMD_ISP_I2C_INPUT_CLK 100 /* Mhz */ 18 19 static void amd_isp_dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *i2c_dev) 20 { 21 pm_runtime_disable(i2c_dev->dev); 22 } 23 24 static inline u32 amd_isp_dw_i2c_get_clk_rate(struct dw_i2c_dev *i2c_dev) 25 { 26 return AMD_ISP_I2C_INPUT_CLK * 1000; 27 } 28 29 static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev) 30 { 31 struct dw_i2c_dev *isp_i2c_dev; 32 struct i2c_adapter *adap; 33 int ret; 34 35 isp_i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c_dev), GFP_KERNEL); 36 if (!isp_i2c_dev) 37 return -ENOMEM; 38 isp_i2c_dev->dev = &pdev->dev; 39 40 pdev->dev.init_name = DRV_NAME; 41 42 /* 43 * Use the polling mode to send/receive the data, because 44 * no IRQ connection from ISP I2C 45 */ 46 isp_i2c_dev->flags |= ACCESS_POLLING; 47 platform_set_drvdata(pdev, isp_i2c_dev); 48 49 isp_i2c_dev->base = devm_platform_ioremap_resource(pdev, 0); 50 if (IS_ERR(isp_i2c_dev->base)) 51 return dev_err_probe(&pdev->dev, PTR_ERR(isp_i2c_dev->base), 52 "failed to get IOMEM resource\n"); 53 54 isp_i2c_dev->get_clk_rate_khz = amd_isp_dw_i2c_get_clk_rate; 55 ret = i2c_dw_fw_parse_and_configure(isp_i2c_dev); 56 if (ret) 57 return dev_err_probe(&pdev->dev, ret, 58 "failed to parse i2c dw fwnode and configure\n"); 59 60 i2c_dw_configure(isp_i2c_dev); 61 62 adap = &isp_i2c_dev->adapter; 63 adap->owner = THIS_MODULE; 64 scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME); 65 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); 66 adap->dev.of_node = pdev->dev.of_node; 67 /* use dynamically allocated adapter id */ 68 adap->nr = -1; 69 70 if (isp_i2c_dev->flags & ACCESS_NO_IRQ_SUSPEND) 71 dev_pm_set_driver_flags(&pdev->dev, 72 DPM_FLAG_SMART_PREPARE); 73 else 74 dev_pm_set_driver_flags(&pdev->dev, 75 DPM_FLAG_SMART_PREPARE | 76 DPM_FLAG_SMART_SUSPEND); 77 78 device_enable_async_suspend(&pdev->dev); 79 80 dev_pm_genpd_resume(&pdev->dev); 81 ret = i2c_dw_probe(isp_i2c_dev); 82 if (ret) { 83 dev_err_probe(&pdev->dev, ret, "i2c_dw_probe failed\n"); 84 goto error_release_rpm; 85 } 86 dev_pm_genpd_suspend(&pdev->dev); 87 pm_runtime_set_suspended(&pdev->dev); 88 pm_runtime_enable(&pdev->dev); 89 90 return 0; 91 92 error_release_rpm: 93 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 94 return ret; 95 } 96 97 static void amd_isp_dw_i2c_plat_remove(struct platform_device *pdev) 98 { 99 struct dw_i2c_dev *isp_i2c_dev = platform_get_drvdata(pdev); 100 101 pm_runtime_get_sync(&pdev->dev); 102 103 i2c_del_adapter(&isp_i2c_dev->adapter); 104 105 i2c_dw_disable(isp_i2c_dev); 106 107 pm_runtime_put_sync(&pdev->dev); 108 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 109 } 110 111 static int amd_isp_dw_i2c_plat_prepare(struct device *dev) 112 { 113 /* 114 * If the ACPI companion device object is present for this device, it 115 * may be accessed during suspend and resume of other devices via I2C 116 * operation regions, so tell the PM core and middle layers to avoid 117 * skipping system suspend/resume callbacks for it in that case. 118 */ 119 return !has_acpi_companion(dev); 120 } 121 122 static int amd_isp_dw_i2c_plat_runtime_suspend(struct device *dev) 123 { 124 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 125 126 i2c_dw_disable(i_dev); 127 i2c_dw_prepare_clk(i_dev, false); 128 129 return 0; 130 } 131 132 static int amd_isp_dw_i2c_plat_suspend(struct device *dev) 133 { 134 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 135 int ret; 136 137 if (!i_dev) 138 return -ENODEV; 139 140 ret = amd_isp_dw_i2c_plat_runtime_suspend(dev); 141 if (!ret) 142 i2c_mark_adapter_suspended(&i_dev->adapter); 143 144 return ret; 145 } 146 147 static int amd_isp_dw_i2c_plat_runtime_resume(struct device *dev) 148 { 149 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 150 151 if (!i_dev) 152 return -ENODEV; 153 154 i2c_dw_prepare_clk(i_dev, true); 155 i2c_dw_init(i_dev); 156 157 return 0; 158 } 159 160 static int amd_isp_dw_i2c_plat_resume(struct device *dev) 161 { 162 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 163 164 amd_isp_dw_i2c_plat_runtime_resume(dev); 165 i2c_mark_adapter_resumed(&i_dev->adapter); 166 167 return 0; 168 } 169 170 static const struct dev_pm_ops amd_isp_dw_i2c_dev_pm_ops = { 171 .prepare = pm_sleep_ptr(amd_isp_dw_i2c_plat_prepare), 172 LATE_SYSTEM_SLEEP_PM_OPS(amd_isp_dw_i2c_plat_suspend, amd_isp_dw_i2c_plat_resume) 173 RUNTIME_PM_OPS(amd_isp_dw_i2c_plat_runtime_suspend, amd_isp_dw_i2c_plat_runtime_resume, NULL) 174 }; 175 176 /* Work with hotplug and coldplug */ 177 MODULE_ALIAS("platform:amd_isp_i2c_designware"); 178 179 static struct platform_driver amd_isp_dw_i2c_driver = { 180 .probe = amd_isp_dw_i2c_plat_probe, 181 .remove = amd_isp_dw_i2c_plat_remove, 182 .driver = { 183 .name = DRV_NAME, 184 .pm = pm_ptr(&amd_isp_dw_i2c_dev_pm_ops), 185 }, 186 }; 187 module_platform_driver(amd_isp_dw_i2c_driver); 188 189 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter in AMD ISP"); 190 MODULE_IMPORT_NS("I2C_DW"); 191 MODULE_IMPORT_NS("I2C_DW_COMMON"); 192 MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vengutta@amd.com>"); 193 MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@amd.com>"); 194 MODULE_AUTHOR("Bin Du <bin.du@amd.com>"); 195 MODULE_LICENSE("GPL"); 196