1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 and 5 * only version 2 as published by the Free Software Foundation. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 15 * 02110-1301, USA. 16 */ 17 18 #ifndef MSM_IOMMU_H 19 #define MSM_IOMMU_H 20 21 #include <linux/interrupt.h> 22 #include <linux/clk.h> 23 24 /* Sharability attributes of MSM IOMMU mappings */ 25 #define MSM_IOMMU_ATTR_NON_SH 0x0 26 #define MSM_IOMMU_ATTR_SH 0x4 27 28 /* Cacheability attributes of MSM IOMMU mappings */ 29 #define MSM_IOMMU_ATTR_NONCACHED 0x0 30 #define MSM_IOMMU_ATTR_CACHED_WB_WA 0x1 31 #define MSM_IOMMU_ATTR_CACHED_WB_NWA 0x2 32 #define MSM_IOMMU_ATTR_CACHED_WT 0x3 33 34 /* Mask for the cache policy attribute */ 35 #define MSM_IOMMU_CP_MASK 0x03 36 37 /* Maximum number of Machine IDs that we are allowing to be mapped to the same 38 * context bank. The number of MIDs mapped to the same CB does not affect 39 * performance, but there is a practical limit on how many distinct MIDs may 40 * be present. These mappings are typically determined at design time and are 41 * not expected to change at run time. 42 */ 43 #define MAX_NUM_MIDS 32 44 45 /* Maximum number of context banks that can be present in IOMMU */ 46 #define IOMMU_MAX_CBS 128 47 48 /** 49 * struct msm_iommu_dev - a single IOMMU hardware instance 50 * ncb Number of context banks present on this IOMMU HW instance 51 * dev: IOMMU device 52 * irq: Interrupt number 53 * clk: The bus clock for this IOMMU hardware instance 54 * pclk: The clock for the IOMMU bus interconnect 55 * dev_node: list head in qcom_iommu_device_list 56 * dom_node: list head for domain 57 * ctx_list: list of 'struct msm_iommu_ctx_dev' 58 * context_map: Bitmap to track allocated context banks 59 */ 60 struct msm_iommu_dev { 61 void __iomem *base; 62 int ncb; 63 struct device *dev; 64 int irq; 65 struct clk *clk; 66 struct clk *pclk; 67 struct list_head dev_node; 68 struct list_head dom_node; 69 struct list_head ctx_list; 70 DECLARE_BITMAP(context_map, IOMMU_MAX_CBS); 71 }; 72 73 /** 74 * struct msm_iommu_ctx_dev - an IOMMU context bank instance 75 * of_node node ptr of client device 76 * num Index of this context bank within the hardware 77 * mids List of Machine IDs that are to be mapped into this context 78 * bank, terminated by -1. The MID is a set of signals on the 79 * AXI bus that identifies the function associated with a specific 80 * memory request. (See ARM spec). 81 * num_mids Total number of mids 82 * node list head in ctx_list 83 */ 84 struct msm_iommu_ctx_dev { 85 struct device_node *of_node; 86 int num; 87 int mids[MAX_NUM_MIDS]; 88 int num_mids; 89 struct list_head list; 90 }; 91 92 /* 93 * Interrupt handler for the IOMMU context fault interrupt. Hooking the 94 * interrupt is not supported in the API yet, but this will print an error 95 * message and dump useful IOMMU registers. 96 */ 97 irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id); 98 99 #endif 100