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_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 struct mtk_smi_iommu { 24 unsigned int larb_nr; 25 struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX]; 26 }; 27 28 /* 29 * mtk_smi_larb_get: Enable the power domain and clocks for this local arbiter. 30 * It also initialize some basic setting(like iommu). 31 * mtk_smi_larb_put: Disable the power domain and clocks for this local arbiter. 32 * Both should be called in non-atomic context. 33 * 34 * Returns 0 if successful, negative on failure. 35 */ 36 int mtk_smi_larb_get(struct device *larbdev); 37 void mtk_smi_larb_put(struct device *larbdev); 38 39 #else 40 41 static inline int mtk_smi_larb_get(struct device *larbdev) 42 { 43 return 0; 44 } 45 46 static inline void mtk_smi_larb_put(struct device *larbdev) { } 47 48 #endif 49 50 #endif 51