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 #ifdef CONFIG_MTK_SMI 13 14 #define MTK_SMI_MMU_EN(port) BIT(port) 15 16 struct mtk_smi_larb_iommu { 17 struct device *dev; 18 unsigned int mmu; 19 unsigned char bank[32]; 20 }; 21 22 /* 23 * mtk_smi_larb_get: Enable the power domain and clocks for this local arbiter. 24 * It also initialize some basic setting(like iommu). 25 * mtk_smi_larb_put: Disable the power domain and clocks for this local arbiter. 26 * Both should be called in non-atomic context. 27 * 28 * Returns 0 if successful, negative on failure. 29 */ 30 int mtk_smi_larb_get(struct device *larbdev); 31 void mtk_smi_larb_put(struct device *larbdev); 32 33 #else 34 35 static inline int mtk_smi_larb_get(struct device *larbdev) 36 { 37 return 0; 38 } 39 40 static inline void mtk_smi_larb_put(struct device *larbdev) { } 41 42 #endif 43 44 #endif 45