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_runtime.h> 11 12 #include "i2c-designware-core.h" 13 14 #define DRV_NAME "amd_isp_i2c_designware" 15 #define AMD_ISP_I2C_INPUT_CLK 100 /* Mhz */ 16 17 static void amd_isp_dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *i2c_dev) 18 { 19 pm_runtime_disable(i2c_dev->dev); 20 21 if (i2c_dev->shared_with_punit) 22 pm_runtime_put_noidle(i2c_dev->dev); 23 } 24 25 static inline u32 amd_isp_dw_i2c_get_clk_rate(struct dw_i2c_dev *i2c_dev) 26 { 27 return AMD_ISP_I2C_INPUT_CLK * 1000; 28 } 29 30 static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev) 31 { 32 struct dw_i2c_dev *isp_i2c_dev; 33 struct i2c_adapter *adap; 34 int ret; 35 36 isp_i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c_dev), GFP_KERNEL); 37 if (!isp_i2c_dev) 38 return -ENOMEM; 39 isp_i2c_dev->dev = &pdev->dev; 40 41 pdev->dev.init_name = DRV_NAME; 42 43 /* 44 * Use the polling mode to send/receive the data, because 45 * no IRQ connection from ISP I2C 46 */ 47 isp_i2c_dev->flags |= ACCESS_POLLING; 48 platform_set_drvdata(pdev, isp_i2c_dev); 49 50 isp_i2c_dev->base = devm_platform_ioremap_resource(pdev, 0); 51 if (IS_ERR(isp_i2c_dev->base)) 52 return dev_err_probe(&pdev->dev, PTR_ERR(isp_i2c_dev->base), 53 "failed to get IOMEM resource\n"); 54 55 isp_i2c_dev->get_clk_rate_khz = amd_isp_dw_i2c_get_clk_rate; 56 ret = i2c_dw_fw_parse_and_configure(isp_i2c_dev); 57 if (ret) 58 return dev_err_probe(&pdev->dev, ret, 59 "failed to parse i2c dw fwnode and configure\n"); 60 61 i2c_dw_configure(isp_i2c_dev); 62 63 adap = &isp_i2c_dev->adapter; 64 adap->owner = THIS_MODULE; 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 if (isp_i2c_dev->shared_with_punit) 81 pm_runtime_get_noresume(&pdev->dev); 82 83 pm_runtime_enable(&pdev->dev); 84 pm_runtime_get_sync(&pdev->dev); 85 86 ret = i2c_dw_probe(isp_i2c_dev); 87 if (ret) { 88 dev_err_probe(&pdev->dev, ret, "i2c_dw_probe failed\n"); 89 goto error_release_rpm; 90 } 91 92 pm_runtime_put_sync(&pdev->dev); 93 94 return 0; 95 96 error_release_rpm: 97 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 98 pm_runtime_put_sync(&pdev->dev); 99 return ret; 100 } 101 102 static void amd_isp_dw_i2c_plat_remove(struct platform_device *pdev) 103 { 104 struct dw_i2c_dev *isp_i2c_dev = platform_get_drvdata(pdev); 105 106 pm_runtime_get_sync(&pdev->dev); 107 108 i2c_del_adapter(&isp_i2c_dev->adapter); 109 110 i2c_dw_disable(isp_i2c_dev); 111 112 pm_runtime_put_sync(&pdev->dev); 113 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 114 } 115 116 static int amd_isp_dw_i2c_plat_prepare(struct device *dev) 117 { 118 /* 119 * If the ACPI companion device object is present for this device, it 120 * may be accessed during suspend and resume of other devices via I2C 121 * operation regions, so tell the PM core and middle layers to avoid 122 * skipping system suspend/resume callbacks for it in that case. 123 */ 124 return !has_acpi_companion(dev); 125 } 126 127 static int amd_isp_dw_i2c_plat_runtime_suspend(struct device *dev) 128 { 129 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 130 131 if (i_dev->shared_with_punit) 132 return 0; 133 134 i2c_dw_disable(i_dev); 135 i2c_dw_prepare_clk(i_dev, false); 136 137 return 0; 138 } 139 140 static int amd_isp_dw_i2c_plat_suspend(struct device *dev) 141 { 142 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 143 int ret; 144 145 if (!i_dev) 146 return -ENODEV; 147 148 ret = amd_isp_dw_i2c_plat_runtime_suspend(dev); 149 if (!ret) 150 i2c_mark_adapter_suspended(&i_dev->adapter); 151 152 return ret; 153 } 154 155 static int amd_isp_dw_i2c_plat_runtime_resume(struct device *dev) 156 { 157 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 158 159 if (!i_dev) 160 return -ENODEV; 161 162 if (!i_dev->shared_with_punit) 163 i2c_dw_prepare_clk(i_dev, true); 164 if (i_dev->init) 165 i_dev->init(i_dev); 166 167 return 0; 168 } 169 170 static int amd_isp_dw_i2c_plat_resume(struct device *dev) 171 { 172 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 173 174 amd_isp_dw_i2c_plat_runtime_resume(dev); 175 i2c_mark_adapter_resumed(&i_dev->adapter); 176 177 return 0; 178 } 179 180 static const struct dev_pm_ops amd_isp_dw_i2c_dev_pm_ops = { 181 .prepare = pm_sleep_ptr(amd_isp_dw_i2c_plat_prepare), 182 LATE_SYSTEM_SLEEP_PM_OPS(amd_isp_dw_i2c_plat_suspend, amd_isp_dw_i2c_plat_resume) 183 RUNTIME_PM_OPS(amd_isp_dw_i2c_plat_runtime_suspend, amd_isp_dw_i2c_plat_runtime_resume, NULL) 184 }; 185 186 /* Work with hotplug and coldplug */ 187 MODULE_ALIAS("platform:amd_isp_i2c_designware"); 188 189 static struct platform_driver amd_isp_dw_i2c_driver = { 190 .probe = amd_isp_dw_i2c_plat_probe, 191 .remove = amd_isp_dw_i2c_plat_remove, 192 .driver = { 193 .name = DRV_NAME, 194 .pm = pm_ptr(&amd_isp_dw_i2c_dev_pm_ops), 195 }, 196 }; 197 module_platform_driver(amd_isp_dw_i2c_driver); 198 199 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter in AMD ISP"); 200 MODULE_IMPORT_NS("I2C_DW"); 201 MODULE_IMPORT_NS("I2C_DW_COMMON"); 202 MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vengutta@amd.com>"); 203 MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@amd.com>"); 204 MODULE_AUTHOR("Bin Du <bin.du@amd.com>"); 205 MODULE_LICENSE("GPL"); 206