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
|
/*
* Freescale STMP37XX/STMP378X DMA helper interface
*
* Embedded Alley Solutions, Inc <source@embeddedalley.com>
*
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#ifndef __ASM_PLAT_STMP3XXX_DMA_H
#define __ASM_PLAT_STMP3XXX_DMA_H
#include <linux/platform_device.h>
#include <linux/dmapool.h>
#if !defined(MAX_PIO_WORDS)
#define MAX_PIO_WORDS (15)
#endif
#define STMP3XXX_BUS_APBH 0
#define STMP3XXX_BUS_APBX 1
#define STMP3XXX_DMA_MAX_CHANNEL 16
#define STMP3XXX_DMA_BUS(dma) ((dma) / 16)
#define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16)
#define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel))
#define MAX_DMA_ADDRESS 0xffffffff
#define MAX_DMA_CHANNELS 32
struct stmp3xxx_dma_command {
u32 next;
u32 cmd;
union {
u32 buf_ptr;
u32 alternate;
};
u32 pio_words[MAX_PIO_WORDS];
};
struct stmp3xxx_dma_descriptor {
struct stmp3xxx_dma_command *command;
dma_addr_t handle;
/* The virtual address of the buffer pointer */
void *virtual_buf_ptr;
/* The next descriptor in a the DMA chain (optional) */
struct stmp3xxx_dma_descriptor *next_descr;
};
struct stmp37xx_circ_dma_chain {
unsigned total_count;
struct stmp3xxx_dma_descriptor *chain;
unsigned free_index;
unsigned free_count;
unsigned active_index;
unsigned active_count;
unsigned cooked_index;
unsigned cooked_count;
int bus;
unsigned channel;
};
static inline struct stmp3xxx_dma_descriptor
*stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain)
{
return &(chain->chain[chain->free_index]);
}
static inline struct stmp3xxx_dma_descriptor
*stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain)
{
return &(chain->chain[chain->cooked_index]);
}
int stmp3xxx_dma_request(int ch, struct device *dev, const char *name);
int stmp3xxx_dma_release(int ch);
int stmp3xxx_dma_allocate_command(int ch,
struct stmp3xxx_dma_descriptor *descriptor);
int stmp3xxx_dma_free_command(int ch,
struct stmp3xxx_dma_descriptor *descriptor);
void stmp3xxx_dma_continue(int channel, u32 semaphore);
void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head,
u32 semaphore);
int stmp3xxx_dma_running(int ch);
int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain,
struct stmp3xxx_dma_descriptor descriptors[],
unsigned items);
void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain);
void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain);
void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain,
unsigned count);
void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain,
unsigned count);
unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain);
int stmp3xxx_dma_read_semaphore(int ch);
void stmp3xxx_dma_init(void);
void stmp3xxx_dma_set_alt_target(int ch, int target);
void stmp3xxx_dma_suspend(void);
void stmp3xxx_dma_resume(void);
/*
* STMP37xx and STMP378x have different DMA control
* registers layout
*/
void stmp3xxx_arch_dma_freeze(int ch);
void stmp3xxx_arch_dma_unfreeze(int ch);
void stmp3xxx_arch_dma_reset_channel(int ch);
void stmp3xxx_arch_dma_enable_interrupt(int ch);
void stmp3xxx_arch_dma_clear_interrupt(int ch);
int stmp3xxx_arch_dma_is_interrupt(int ch);
static inline void stmp3xxx_dma_reset_channel(int ch)
{
stmp3xxx_arch_dma_reset_channel(ch);
}
static inline void stmp3xxx_dma_freeze(int ch)
{
stmp3xxx_arch_dma_freeze(ch);
}
static inline void stmp3xxx_dma_unfreeze(int ch)
{
stmp3xxx_arch_dma_unfreeze(ch);
}
static inline void stmp3xxx_dma_enable_interrupt(int ch)
{
stmp3xxx_arch_dma_enable_interrupt(ch);
}
static inline void stmp3xxx_dma_clear_interrupt(int ch)
{
stmp3xxx_arch_dma_clear_interrupt(ch);
}
static inline int stmp3xxx_dma_is_interrupt(int ch)
{
return stmp3xxx_arch_dma_is_interrupt(ch);
}
#endif /* __ASM_PLAT_STMP3XXX_DMA_H */
|
