1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2015-2016 MediaTek Inc. 4 * Author: Yong Wu <yong.wu@mediatek.com> 5 */ 6 #ifndef MTK_IOMMU_SMI_H 7 #define MTK_IOMMU_SMI_H 8 9 #include <linux/bitops.h> 10 #include <linux/device.h> 11 12 #if IS_ENABLED(CONFIG_MTK_SMI) 13 14 #define MTK_LARB_NR_MAX 16 15 16 #define MTK_SMI_MMU_EN(port) BIT(port) 17 18 struct mtk_smi_larb_iommu { 19 struct device *dev; 20 unsigned int mmu; 21 }; 22 23 /* 24 * mtk_smi_larb_get: Enable the power domain and clocks for this local arbiter. 25 * It also initialize some basic setting(like iommu). 26 * mtk_smi_larb_put: Disable the power domain and clocks for this local arbiter. 27 * Both should be called in non-atomic context. 28 * 29 * Returns 0 if successful, negative on failure. 30 */ 31 int mtk_smi_larb_get(struct device *larbdev); 32 void mtk_smi_larb_put(struct device *larbdev); 33 34 #else 35 36 static inline int mtk_smi_larb_get(struct device *larbdev) 37 { 38 return 0; 39 } 40 41 static inline void mtk_smi_larb_put(struct device *larbdev) { } 42 43 #endif 44 45 #endif 46