1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#ifndef __ASM_PLAT_STMP3XXX_DMA_H
19#define __ASM_PLAT_STMP3XXX_DMA_H
20
21#include <linux/platform_device.h>
22#include <linux/dmapool.h>
23
24#if !defined(MAX_PIO_WORDS)
25#define MAX_PIO_WORDS (15)
26#endif
27
28#define STMP3XXX_BUS_APBH 0
29#define STMP3XXX_BUS_APBX 1
30#define STMP3XXX_DMA_MAX_CHANNEL 16
31#define STMP3XXX_DMA_BUS(dma) ((dma) / 16)
32#define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16)
33#define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel))
34#define MAX_DMA_ADDRESS 0xffffffff
35#define MAX_DMA_CHANNELS 32
36
37struct stmp3xxx_dma_command {
38 u32 next;
39 u32 cmd;
40 union {
41 u32 buf_ptr;
42 u32 alternate;
43 };
44 u32 pio_words[MAX_PIO_WORDS];
45};
46
47struct stmp3xxx_dma_descriptor {
48 struct stmp3xxx_dma_command *command;
49 dma_addr_t handle;
50
51
52 void *virtual_buf_ptr;
53
54 struct stmp3xxx_dma_descriptor *next_descr;
55};
56
57struct stmp37xx_circ_dma_chain {
58 unsigned total_count;
59 struct stmp3xxx_dma_descriptor *chain;
60
61 unsigned free_index;
62 unsigned free_count;
63 unsigned active_index;
64 unsigned active_count;
65 unsigned cooked_index;
66 unsigned cooked_count;
67
68 int bus;
69 unsigned channel;
70};
71
72static inline struct stmp3xxx_dma_descriptor
73 *stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain)
74{
75 return &(chain->chain[chain->free_index]);
76}
77
78static inline struct stmp3xxx_dma_descriptor
79 *stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain)
80{
81 return &(chain->chain[chain->cooked_index]);
82}
83
84int stmp3xxx_dma_request(int ch, struct device *dev, const char *name);
85int stmp3xxx_dma_release(int ch);
86int stmp3xxx_dma_allocate_command(int ch,
87 struct stmp3xxx_dma_descriptor *descriptor);
88int stmp3xxx_dma_free_command(int ch,
89 struct stmp3xxx_dma_descriptor *descriptor);
90void stmp3xxx_dma_continue(int channel, u32 semaphore);
91void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head,
92 u32 semaphore);
93int stmp3xxx_dma_running(int ch);
94int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain,
95 struct stmp3xxx_dma_descriptor descriptors[],
96 unsigned items);
97void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain);
98void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain);
99void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain,
100 unsigned count);
101void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain,
102 unsigned count);
103unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain);
104int stmp3xxx_dma_read_semaphore(int ch);
105void stmp3xxx_dma_init(void);
106void stmp3xxx_dma_set_alt_target(int ch, int target);
107void stmp3xxx_dma_suspend(void);
108void stmp3xxx_dma_resume(void);
109
110
111
112
113
114
115void stmp3xxx_arch_dma_freeze(int ch);
116void stmp3xxx_arch_dma_unfreeze(int ch);
117void stmp3xxx_arch_dma_reset_channel(int ch);
118void stmp3xxx_arch_dma_enable_interrupt(int ch);
119void stmp3xxx_arch_dma_clear_interrupt(int ch);
120int stmp3xxx_arch_dma_is_interrupt(int ch);
121
122static inline void stmp3xxx_dma_reset_channel(int ch)
123{
124 stmp3xxx_arch_dma_reset_channel(ch);
125}
126
127
128static inline void stmp3xxx_dma_freeze(int ch)
129{
130 stmp3xxx_arch_dma_freeze(ch);
131}
132
133static inline void stmp3xxx_dma_unfreeze(int ch)
134{
135 stmp3xxx_arch_dma_unfreeze(ch);
136}
137
138static inline void stmp3xxx_dma_enable_interrupt(int ch)
139{
140 stmp3xxx_arch_dma_enable_interrupt(ch);
141}
142
143static inline void stmp3xxx_dma_clear_interrupt(int ch)
144{
145 stmp3xxx_arch_dma_clear_interrupt(ch);
146}
147
148static inline int stmp3xxx_dma_is_interrupt(int ch)
149{
150 return stmp3xxx_arch_dma_is_interrupt(ch);
151}
152
153#endif
154