1 /* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
2 /*
3 * Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
4 *
5 * author:
6 * Alpha Lin, alpha.lin@rock-chips.com
7 * Randy Li, randy.li@rock-chips.com
8 * Ding Wei, leo.ding@rock-chips.com
9 *
10 */
11 #ifndef __ROCKCHIP_MPP_IOMMU_H__
12 #define __ROCKCHIP_MPP_IOMMU_H__
13
14 #include <linux/iommu.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/interrupt.h>
17
18 struct mpp_dma_buffer {
19 /* link to dma session buffer list */
20 struct list_head link;
21
22 /* dma session belong */
23 struct mpp_dma_session *dma;
24 /* DMABUF information */
25 struct dma_buf *dmabuf;
26 struct dma_buf_attachment *attach;
27 struct sg_table *sgt;
28 struct sg_table *copy_sgt;
29 enum dma_data_direction dir;
30
31 dma_addr_t iova;
32 unsigned long size;
33 void *vaddr;
34
35 struct kref ref;
36 ktime_t last_used;
37 /* alloc by device */
38 struct device *dev;
39 };
40
41 #define MPP_SESSION_MAX_BUFFERS 60
42
43 struct mpp_dma_session {
44 /* the buffer used in session */
45 struct list_head unused_list;
46 struct list_head used_list;
47 struct mpp_dma_buffer dma_bufs[MPP_SESSION_MAX_BUFFERS];
48 /* the mutex for the above buffer list */
49 struct mutex list_mutex;
50 /* the max buffer num for the buffer list */
51 u32 max_buffers;
52 /* the count for the buffer list */
53 int buffer_count;
54
55 struct device *dev;
56 };
57
58 struct mpp_rk_iommu {
59 struct list_head link;
60 u32 grf_val;
61 int mmu_num;
62 u32 base_addr[2];
63 void __iomem *bases[2];
64 u32 dte_addr;
65 u32 is_paged;
66 };
67
68 struct mpp_dev;
69
70 struct mpp_iommu_info {
71 struct rw_semaphore rw_sem;
72
73 struct device *dev;
74 struct platform_device *pdev;
75 struct iommu_domain *domain;
76 struct iommu_group *group;
77 struct mpp_rk_iommu *iommu;
78 iommu_fault_handler_t hdl;
79
80 spinlock_t dev_lock;
81 struct mpp_dev *dev_active;
82
83 u32 av1d_iommu;
84 int irq;
85 int got_irq;
86 };
87
88 struct mpp_dma_session *
89 mpp_dma_session_create(struct device *dev, u32 max_buffers);
90 int mpp_dma_session_destroy(struct mpp_dma_session *dma);
91
92 struct mpp_dma_buffer *
93 mpp_dma_alloc(struct device *dev, size_t size);
94 int mpp_dma_free(struct mpp_dma_buffer *buffer);
95
96 struct mpp_dma_buffer *
97 mpp_dma_import_fd(struct mpp_iommu_info *iommu_info,
98 struct mpp_dma_session *dma, int fd);
99 int mpp_dma_release(struct mpp_dma_session *dma,
100 struct mpp_dma_buffer *buffer);
101 int mpp_dma_release_fd(struct mpp_dma_session *dma, int fd);
102
103 int mpp_dma_unmap_kernel(struct mpp_dma_session *dma,
104 struct mpp_dma_buffer *buffer);
105 int mpp_dma_map_kernel(struct mpp_dma_session *dma,
106 struct mpp_dma_buffer *buffer);
107 struct mpp_dma_buffer *mpp_dma_find_buffer_fd(struct mpp_dma_session *dma, int fd);
108 void mpp_dma_buf_sync(struct mpp_dma_buffer *buffer, u32 offset, u32 length,
109 enum dma_data_direction dir, bool for_cpu);
110
111 struct mpp_iommu_info *
112 mpp_iommu_probe(struct device *dev);
113 int mpp_iommu_remove(struct mpp_iommu_info *info);
114
115 int mpp_iommu_attach(struct mpp_iommu_info *info);
116 int mpp_iommu_detach(struct mpp_iommu_info *info);
117
118 int mpp_iommu_refresh(struct mpp_iommu_info *info, struct device *dev);
119 int mpp_iommu_flush_tlb(struct mpp_iommu_info *info);
120 int mpp_av1_iommu_disable(struct device *dev);
121 int mpp_av1_iommu_enable(struct device *dev);
122
123 int mpp_iommu_dev_activate(struct mpp_iommu_info *info, struct mpp_dev *dev);
124 int mpp_iommu_dev_deactivate(struct mpp_iommu_info *info, struct mpp_dev *dev);
125
mpp_iommu_down_read(struct mpp_iommu_info * info)126 static inline int mpp_iommu_down_read(struct mpp_iommu_info *info)
127 {
128 if (info)
129 down_read(&info->rw_sem);
130
131 return 0;
132 }
133
mpp_iommu_up_read(struct mpp_iommu_info * info)134 static inline int mpp_iommu_up_read(struct mpp_iommu_info *info)
135 {
136 if (info)
137 up_read(&info->rw_sem);
138
139 return 0;
140 }
141
mpp_iommu_down_write(struct mpp_iommu_info * info)142 static inline int mpp_iommu_down_write(struct mpp_iommu_info *info)
143 {
144 if (info)
145 down_write(&info->rw_sem);
146
147 return 0;
148 }
149
mpp_iommu_up_write(struct mpp_iommu_info * info)150 static inline int mpp_iommu_up_write(struct mpp_iommu_info *info)
151 {
152 if (info)
153 up_write(&info->rw_sem);
154
155 return 0;
156 }
157
mpp_iommu_enable_irq(struct mpp_iommu_info * info)158 static inline void mpp_iommu_enable_irq(struct mpp_iommu_info *info)
159 {
160 if (info && info->got_irq)
161 enable_irq(info->irq);
162 }
163
mpp_iommu_disable_irq(struct mpp_iommu_info * info)164 static inline void mpp_iommu_disable_irq(struct mpp_iommu_info *info)
165 {
166 if (info && info->got_irq)
167 disable_irq(info->irq);
168 }
169
170 #endif
171