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 #include <linux/soc/amd/isp4_misc.h> 12 13 #include "i2c-designware-core.h" 14 15 #define DRV_NAME "amd_isp_i2c_designware" 16 #define AMD_ISP_I2C_INPUT_CLK 100 /* Mhz */ 17 18 static void amd_isp_dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *i2c_dev) 19 { 20 pm_runtime_disable(i2c_dev->dev); 21 22 if (i2c_dev->shared_with_punit) 23 pm_runtime_put_noidle(i2c_dev->dev); 24 } 25 26 static inline u32 amd_isp_dw_i2c_get_clk_rate(struct dw_i2c_dev *i2c_dev) 27 { 28 return AMD_ISP_I2C_INPUT_CLK * 1000; 29 } 30 31 static int amd_isp_dw_i2c_plat_probe(struct platform_device *pdev) 32 { 33 struct dw_i2c_dev *isp_i2c_dev; 34 struct i2c_adapter *adap; 35 int ret; 36 37 isp_i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c_dev), GFP_KERNEL); 38 if (!isp_i2c_dev) 39 return -ENOMEM; 40 isp_i2c_dev->dev = &pdev->dev; 41 42 pdev->dev.init_name = DRV_NAME; 43 44 /* 45 * Use the polling mode to send/receive the data, because 46 * no IRQ connection from ISP I2C 47 */ 48 isp_i2c_dev->flags |= ACCESS_POLLING; 49 platform_set_drvdata(pdev, isp_i2c_dev); 50 51 isp_i2c_dev->base = devm_platform_ioremap_resource(pdev, 0); 52 if (IS_ERR(isp_i2c_dev->base)) 53 return dev_err_probe(&pdev->dev, PTR_ERR(isp_i2c_dev->base), 54 "failed to get IOMEM resource\n"); 55 56 isp_i2c_dev->get_clk_rate_khz = amd_isp_dw_i2c_get_clk_rate; 57 ret = i2c_dw_fw_parse_and_configure(isp_i2c_dev); 58 if (ret) 59 return dev_err_probe(&pdev->dev, ret, 60 "failed to parse i2c dw fwnode and configure\n"); 61 62 i2c_dw_configure(isp_i2c_dev); 63 64 adap = &isp_i2c_dev->adapter; 65 adap->owner = THIS_MODULE; 66 scnprintf(adap->name, sizeof(adap->name), AMDISP_I2C_ADAP_NAME); 67 ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); 68 adap->dev.of_node = pdev->dev.of_node; 69 /* use dynamically allocated adapter id */ 70 adap->nr = -1; 71 72 if (isp_i2c_dev->flags & ACCESS_NO_IRQ_SUSPEND) 73 dev_pm_set_driver_flags(&pdev->dev, 74 DPM_FLAG_SMART_PREPARE); 75 else 76 dev_pm_set_driver_flags(&pdev->dev, 77 DPM_FLAG_SMART_PREPARE | 78 DPM_FLAG_SMART_SUSPEND); 79 80 device_enable_async_suspend(&pdev->dev); 81 82 if (isp_i2c_dev->shared_with_punit) 83 pm_runtime_get_noresume(&pdev->dev); 84 85 pm_runtime_enable(&pdev->dev); 86 pm_runtime_get_sync(&pdev->dev); 87 88 ret = i2c_dw_probe(isp_i2c_dev); 89 if (ret) { 90 dev_err_probe(&pdev->dev, ret, "i2c_dw_probe failed\n"); 91 goto error_release_rpm; 92 } 93 94 pm_runtime_put_sync(&pdev->dev); 95 96 return 0; 97 98 error_release_rpm: 99 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 100 pm_runtime_put_sync(&pdev->dev); 101 return ret; 102 } 103 104 static void amd_isp_dw_i2c_plat_remove(struct platform_device *pdev) 105 { 106 struct dw_i2c_dev *isp_i2c_dev = platform_get_drvdata(pdev); 107 108 pm_runtime_get_sync(&pdev->dev); 109 110 i2c_del_adapter(&isp_i2c_dev->adapter); 111 112 i2c_dw_disable(isp_i2c_dev); 113 114 pm_runtime_put_sync(&pdev->dev); 115 amd_isp_dw_i2c_plat_pm_cleanup(isp_i2c_dev); 116 } 117 118 static int amd_isp_dw_i2c_plat_prepare(struct device *dev) 119 { 120 /* 121 * If the ACPI companion device object is present for this device, it 122 * may be accessed during suspend and resume of other devices via I2C 123 * operation regions, so tell the PM core and middle layers to avoid 124 * skipping system suspend/resume callbacks for it in that case. 125 */ 126 return !has_acpi_companion(dev); 127 } 128 129 static int amd_isp_dw_i2c_plat_runtime_suspend(struct device *dev) 130 { 131 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 132 133 if (i_dev->shared_with_punit) 134 return 0; 135 136 i2c_dw_disable(i_dev); 137 i2c_dw_prepare_clk(i_dev, false); 138 139 return 0; 140 } 141 142 static int amd_isp_dw_i2c_plat_suspend(struct device *dev) 143 { 144 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 145 int ret; 146 147 if (!i_dev) 148 return -ENODEV; 149 150 ret = amd_isp_dw_i2c_plat_runtime_suspend(dev); 151 if (!ret) 152 i2c_mark_adapter_suspended(&i_dev->adapter); 153 154 return ret; 155 } 156 157 static int amd_isp_dw_i2c_plat_runtime_resume(struct device *dev) 158 { 159 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 160 161 if (!i_dev) 162 return -ENODEV; 163 164 if (!i_dev->shared_with_punit) 165 i2c_dw_prepare_clk(i_dev, true); 166 if (i_dev->init) 167 i_dev->init(i_dev); 168 169 return 0; 170 } 171 172 static int amd_isp_dw_i2c_plat_resume(struct device *dev) 173 { 174 struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); 175 176 amd_isp_dw_i2c_plat_runtime_resume(dev); 177 i2c_mark_adapter_resumed(&i_dev->adapter); 178 179 return 0; 180 } 181 182 static const struct dev_pm_ops amd_isp_dw_i2c_dev_pm_ops = { 183 .prepare = pm_sleep_ptr(amd_isp_dw_i2c_plat_prepare), 184 LATE_SYSTEM_SLEEP_PM_OPS(amd_isp_dw_i2c_plat_suspend, amd_isp_dw_i2c_plat_resume) 185 RUNTIME_PM_OPS(amd_isp_dw_i2c_plat_runtime_suspend, amd_isp_dw_i2c_plat_runtime_resume, NULL) 186 }; 187 188 /* Work with hotplug and coldplug */ 189 MODULE_ALIAS("platform:amd_isp_i2c_designware"); 190 191 static struct platform_driver amd_isp_dw_i2c_driver = { 192 .probe = amd_isp_dw_i2c_plat_probe, 193 .remove = amd_isp_dw_i2c_plat_remove, 194 .driver = { 195 .name = DRV_NAME, 196 .pm = pm_ptr(&amd_isp_dw_i2c_dev_pm_ops), 197 }, 198 }; 199 module_platform_driver(amd_isp_dw_i2c_driver); 200 201 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter in AMD ISP"); 202 MODULE_IMPORT_NS("I2C_DW"); 203 MODULE_IMPORT_NS("I2C_DW_COMMON"); 204 MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vengutta@amd.com>"); 205 MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@amd.com>"); 206 MODULE_AUTHOR("Bin Du <bin.du@amd.com>"); 207 MODULE_LICENSE("GPL"); 208