1 /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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.
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.
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
21 #include <linux/interrupt.h>
22 #include <linux/iommu.h>
23 #include <linux/clk.h>
25 /* Sharability attributes of MSM IOMMU mappings */
26 #define MSM_IOMMU_ATTR_NON_SH 0x0
27 #define MSM_IOMMU_ATTR_SH 0x4
29 /* Cacheability attributes of MSM IOMMU mappings */
30 #define MSM_IOMMU_ATTR_NONCACHED 0x0
31 #define MSM_IOMMU_ATTR_CACHED_WB_WA 0x1
32 #define MSM_IOMMU_ATTR_CACHED_WB_NWA 0x2
33 #define MSM_IOMMU_ATTR_CACHED_WT 0x3
35 /* Mask for the cache policy attribute */
36 #define MSM_IOMMU_CP_MASK 0x03
38 /* Maximum number of Machine IDs that we are allowing to be mapped to the same
39 * context bank. The number of MIDs mapped to the same CB does not affect
40 * performance, but there is a practical limit on how many distinct MIDs may
41 * be present. These mappings are typically determined at design time and are
42 * not expected to change at run time.
44 #define MAX_NUM_MIDS 32
46 /* Maximum number of context banks that can be present in IOMMU */
47 #define IOMMU_MAX_CBS 128
50 * struct msm_iommu_dev - a single IOMMU hardware instance
51 * ncb Number of context banks present on this IOMMU HW instance
53 * irq: Interrupt number
54 * clk: The bus clock for this IOMMU hardware instance
55 * pclk: The clock for the IOMMU bus interconnect
56 * dev_node: list head in qcom_iommu_device_list
57 * dom_node: list head for domain
58 * ctx_list: list of 'struct msm_iommu_ctx_dev'
59 * context_map: Bitmap to track allocated context banks
61 struct msm_iommu_dev {
68 struct list_head dev_node;
69 struct list_head dom_node;
70 struct list_head ctx_list;
71 DECLARE_BITMAP(context_map, IOMMU_MAX_CBS);
73 struct iommu_device iommu;
77 * struct msm_iommu_ctx_dev - an IOMMU context bank instance
78 * of_node node ptr of client device
79 * num Index of this context bank within the hardware
80 * mids List of Machine IDs that are to be mapped into this context
81 * bank, terminated by -1. The MID is a set of signals on the
82 * AXI bus that identifies the function associated with a specific
83 * memory request. (See ARM spec).
84 * num_mids Total number of mids
85 * node list head in ctx_list
87 struct msm_iommu_ctx_dev {
88 struct device_node *of_node;
90 int mids[MAX_NUM_MIDS];
92 struct list_head list;
96 * Interrupt handler for the IOMMU context fault interrupt. Hooking the
97 * interrupt is not supported in the API yet, but this will print an error
98 * message and dump useful IOMMU registers.
100 irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id);