Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 09968a02d291876461759be869d440e57a8696a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * omap iommu: main structures
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 */

#ifndef _OMAP_IOMMU_H
#define _OMAP_IOMMU_H

#include <linux/bitops.h>
#include <linux/iommu.h>

#define for_each_iotlb_cr(obj, n, __i, cr)				\
	for (__i = 0;							\
	     (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true);	\
	     __i++)

struct iotlb_entry {
	u32 da;
	u32 pa;
	u32 pgsz, prsvd, valid;
	u32 endian, elsz, mixed;
};

/**
 * struct omap_iommu_device - omap iommu device data
 * @pgtable:	page table used by an omap iommu attached to a domain
 * @iommu_dev:	pointer to store an omap iommu instance attached to a domain
 */
struct omap_iommu_device {
	u32 *pgtable;
	struct omap_iommu *iommu_dev;
};

/**
 * struct omap_iommu_domain - omap iommu domain
 * @num_iommus: number of iommus in this domain
 * @iommus:	omap iommu device data for all iommus in this domain
 * @dev:	Device using this domain.
 * @lock:	domain lock, should be taken when attaching/detaching
 * @domain:	generic domain handle used by iommu core code
 */
struct omap_iommu_domain {
	u32 num_iommus;
	struct omap_iommu_device *iommus;
	struct device *dev;
	spinlock_t lock;
	struct iommu_domain domain;
};

struct omap_iommu {
	const char	*name;
	void __iomem	*regbase;
	struct regmap	*syscfg;
	struct device	*dev;
	struct iommu_domain *domain;
	struct dentry	*debug_dir;

	spinlock_t	iommu_lock;	/* global for this whole object */

	/*
	 * We don't change iopgd for a situation like pgd for a task,
	 * but share it globally for each iommu.
	 */
	u32		*iopgd;
	spinlock_t	page_table_lock; /* protect iopgd */
	dma_addr_t	pd_dma;

	int		nr_tlb_entries;

	void *ctx; /* iommu context: registres saved area */

	int has_bus_err_back;
	u32 id;

	struct iommu_device iommu;
	struct iommu_group *group;
};

/**
 * struct omap_iommu_arch_data - omap iommu private data
 * @iommu_dev: handle of the iommu device
 *
 * This is an omap iommu private data object, which binds an iommu user
 * to its iommu device. This object should be placed at the iommu user's
 * dev_archdata so generic IOMMU API can be used without having to
 * utilize omap-specific plumbing anymore.
 */
struct omap_iommu_arch_data {
	struct omap_iommu *iommu_dev;
};

struct cr_regs {
	u32 cam;
	u32 ram;
};

struct iotlb_lock {
	short base;
	short vict;
};

/*
 * MMU Register offsets
 */
#define MMU_REVISION		0x00
#define MMU_IRQSTATUS		0x18
#define MMU_IRQENABLE		0x1c
#define MMU_WALKING_ST		0x40
#define MMU_CNTL		0x44
#define MMU_FAULT_AD		0x48
#define MMU_TTB			0x4c
#define MMU_LOCK		0x50
#define MMU_LD_TLB		0x54
#define MMU_CAM			0x58
#define MMU_RAM			0x5c
#define MMU_GFLUSH		0x60
#define MMU_FLUSH_ENTRY		0x64
#define MMU_READ_CAM		0x68
#define MMU_READ_RAM		0x6c
#define MMU_EMU_FAULT_AD	0x70
#define MMU_GP_REG		0x88

#define MMU_REG_SIZE		256

/*
 * MMU Register bit definitions
 */
/* IRQSTATUS & IRQENABLE */
#define MMU_IRQ_MULTIHITFAULT	BIT(4)
#define MMU_IRQ_TABLEWALKFAULT	BIT(3)
#define MMU_IRQ_EMUMISS		BIT(2)
#define MMU_IRQ_TRANSLATIONFAULT	BIT(1)
#define MMU_IRQ_TLBMISS		BIT(0)

#define __MMU_IRQ_FAULT		\
	(MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT)
#define MMU_IRQ_MASK		\
	(__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS)
#define MMU_IRQ_TWL_MASK	(__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT)
#define MMU_IRQ_TLB_MISS_MASK	(__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS)

/* MMU_CNTL */
#define MMU_CNTL_SHIFT		1
#define MMU_CNTL_MASK		(7 << MMU_CNTL_SHIFT)
#define MMU_CNTL_EML_TLB	BIT(3)
#define MMU_CNTL_TWL_EN		BIT(2)
#define MMU_CNTL_MMU_EN		BIT(1)

/* CAM */
#define MMU_CAM_VATAG_SHIFT	12
#define MMU_CAM_VATAG_MASK \
	((~0UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
#define MMU_CAM_P		BIT(3)
#define MMU_CAM_V		BIT(2)
#define MMU_CAM_PGSZ_MASK	3
#define MMU_CAM_PGSZ_1M		(0 << 0)
#define MMU_CAM_PGSZ_64K	(1 << 0)
#define MMU_CAM_PGSZ_4K		(2 << 0)
#define MMU_CAM_PGSZ_16M	(3 << 0)

/* RAM */
#define MMU_RAM_PADDR_SHIFT	12
#define MMU_RAM_PADDR_MASK \
	((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)

#define MMU_RAM_ENDIAN_SHIFT	9
#define MMU_RAM_ENDIAN_MASK	BIT(MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_LITTLE	(0 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_BIG	BIT(MMU_RAM_ENDIAN_SHIFT)

#define MMU_RAM_ELSZ_SHIFT	7
#define MMU_RAM_ELSZ_MASK	(3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_8		(0 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_16		(1 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_32		(2 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_NONE	(3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_MIXED_SHIFT	6
#define MMU_RAM_MIXED_MASK	BIT(MMU_RAM_MIXED_SHIFT)
#define MMU_RAM_MIXED		MMU_RAM_MIXED_MASK

#define MMU_GP_REG_BUS_ERR_BACK_EN	0x1

#define get_cam_va_mask(pgsz)				\
	(((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 :	\
	 ((pgsz) == MMU_CAM_PGSZ_1M)  ? 0xfff00000 :	\
	 ((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 :	\
	 ((pgsz) == MMU_CAM_PGSZ_4K)  ? 0xfffff000 : 0)

/*
 * DSP_SYSTEM registers and bit definitions (applicable only for DRA7xx DSP)
 */
#define DSP_SYS_REVISION		0x00
#define DSP_SYS_MMU_CONFIG		0x18
#define DSP_SYS_MMU_CONFIG_EN_SHIFT	4

/*
 * utilities for super page(16MB, 1MB, 64KB and 4KB)
 */

#define iopgsz_max(bytes)			\
	(((bytes) >= SZ_16M) ? SZ_16M :		\
	 ((bytes) >= SZ_1M)  ? SZ_1M  :		\
	 ((bytes) >= SZ_64K) ? SZ_64K :		\
	 ((bytes) >= SZ_4K)  ? SZ_4K  :	0)

#define bytes_to_iopgsz(bytes)				\
	(((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :	\
	 ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :	\
	 ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :	\
	 ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)

#define iopgsz_to_bytes(iopgsz)				\
	(((iopgsz) == MMU_CAM_PGSZ_16M)	? SZ_16M :	\
	 ((iopgsz) == MMU_CAM_PGSZ_1M)	? SZ_1M  :	\
	 ((iopgsz) == MMU_CAM_PGSZ_64K)	? SZ_64K :	\
	 ((iopgsz) == MMU_CAM_PGSZ_4K)	? SZ_4K  : 0)

#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)

/*
 * global functions
 */

struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n);
void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l);
void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l);

#ifdef CONFIG_OMAP_IOMMU_DEBUG
void omap_iommu_debugfs_init(void);
void omap_iommu_debugfs_exit(void);

void omap_iommu_debugfs_add(struct omap_iommu *obj);
void omap_iommu_debugfs_remove(struct omap_iommu *obj);
#else
static inline void omap_iommu_debugfs_init(void) { }
static inline void omap_iommu_debugfs_exit(void) { }

static inline void omap_iommu_debugfs_add(struct omap_iommu *obj) { }
static inline void omap_iommu_debugfs_remove(struct omap_iommu *obj) { }
#endif

/*
 * register accessors
 */
static inline u32 iommu_read_reg(struct omap_iommu *obj, size_t offs)
{
	return __raw_readl(obj->regbase + offs);
}

static inline void iommu_write_reg(struct omap_iommu *obj, u32 val, size_t offs)
{
	__raw_writel(val, obj->regbase + offs);
}

static inline int iotlb_cr_valid(struct cr_regs *cr)
{
	if (!cr)
		return -EINVAL;

	return cr->cam & MMU_CAM_V;
}

#endif /* _OMAP_IOMMU_H */