2 * dma.h - Blackfin DMA defines/structures/etc...
4 * Copyright 2004-2008 Analog Devices Inc.
5 * Licensed under the GPL-2 or later.
8 #ifndef _BLACKFIN_DMA_H_
9 #define _BLACKFIN_DMA_H_
11 #include <linux/interrupt.h>
13 #include <asm/blackfin.h>
16 #define MAX_DMA_ADDRESS PAGE_OFFSET
18 /*****************************************************************************
19 * Generic DMA Declarations
21 ****************************************************************************/
22 enum dma_chan_status
{
24 DMA_CHANNEL_REQUESTED
,
28 /*-------------------------
29 * config reg bits value
30 *-------------------------*/
32 #define DATA_SIZE_16 1
33 #define DATA_SIZE_32 2
35 #define DMA_FLOW_STOP 0
36 #define DMA_FLOW_AUTO 1
37 #define DMA_FLOW_ARRAY 4
38 #define DMA_FLOW_SMALL 6
39 #define DMA_FLOW_LARGE 7
41 #define DIMENSION_LINEAR 0
42 #define DIMENSION_2D 1
47 #define INTR_DISABLE 0
51 #define DMA_NOSYNC_KEEP_DMA_BUF 0
52 #define DMA_SYNC_RESTART 1
56 unsigned long start_addr
;
58 unsigned short x_count
;
60 unsigned short y_count
;
62 } __attribute__((packed
));
65 void *next_desc_ptr
; /* DMA Next Descriptor Pointer register */
66 unsigned long start_addr
; /* DMA Start address register */
68 unsigned short cfg
; /* DMA Configuration register */
69 unsigned short dummy1
; /* DMA Configuration register */
71 unsigned long reserved
;
73 unsigned short x_count
; /* DMA x_count register */
74 unsigned short dummy2
;
76 short x_modify
; /* DMA x_modify register */
77 unsigned short dummy3
;
79 unsigned short y_count
; /* DMA y_count register */
80 unsigned short dummy4
;
82 short y_modify
; /* DMA y_modify register */
83 unsigned short dummy5
;
85 void *curr_desc_ptr
; /* DMA Current Descriptor Pointer
87 unsigned long curr_addr_ptr
; /* DMA Current Address Pointer
89 unsigned short irq_status
; /* DMA irq status register */
90 unsigned short dummy6
;
92 unsigned short peripheral_map
; /* DMA peripheral map register */
93 unsigned short dummy7
;
95 unsigned short curr_x_count
; /* DMA Current x-count register */
96 unsigned short dummy8
;
98 unsigned long reserved2
;
100 unsigned short curr_y_count
; /* DMA Current y-count register */
101 unsigned short dummy9
;
103 unsigned long reserved3
;
109 struct mutex dmalock
;
110 const char *device_id
;
111 enum dma_chan_status chan_status
;
112 struct dma_register
*regs
;
113 struct dmasg
*sg
; /* large mode descriptor */
117 unsigned short saved_peripheral_map
;
122 int blackfin_dma_suspend(void);
123 void blackfin_dma_resume(void);
126 /*******************************************************************************
128 *******************************************************************************/
129 extern struct dma_channel dma_ch
[MAX_DMA_CHANNELS
];
130 extern struct dma_register
*dma_io_base_addr
[MAX_DMA_CHANNELS
];
131 extern int channel2irq(unsigned int channel
);
133 static inline void set_dma_start_addr(unsigned int channel
, unsigned long addr
)
135 dma_ch
[channel
].regs
->start_addr
= addr
;
137 static inline void set_dma_next_desc_addr(unsigned int channel
, void *addr
)
139 dma_ch
[channel
].regs
->next_desc_ptr
= addr
;
141 static inline void set_dma_curr_desc_addr(unsigned int channel
, void *addr
)
143 dma_ch
[channel
].regs
->curr_desc_ptr
= addr
;
145 static inline void set_dma_x_count(unsigned int channel
, unsigned short x_count
)
147 dma_ch
[channel
].regs
->x_count
= x_count
;
149 static inline void set_dma_y_count(unsigned int channel
, unsigned short y_count
)
151 dma_ch
[channel
].regs
->y_count
= y_count
;
153 static inline void set_dma_x_modify(unsigned int channel
, short x_modify
)
155 dma_ch
[channel
].regs
->x_modify
= x_modify
;
157 static inline void set_dma_y_modify(unsigned int channel
, short y_modify
)
159 dma_ch
[channel
].regs
->y_modify
= y_modify
;
161 static inline void set_dma_config(unsigned int channel
, unsigned short config
)
163 dma_ch
[channel
].regs
->cfg
= config
;
165 static inline void set_dma_curr_addr(unsigned int channel
, unsigned long addr
)
167 dma_ch
[channel
].regs
->curr_addr_ptr
= addr
;
170 static inline unsigned short
171 set_bfin_dma_config(char direction
, char flow_mode
,
172 char intr_mode
, char dma_mode
, char width
, char syncmode
)
174 return (direction
<< 1) | (width
<< 2) | (dma_mode
<< 4) |
175 (intr_mode
<< 6) | (flow_mode
<< 12) | (syncmode
<< 5);
178 static inline unsigned short get_dma_curr_irqstat(unsigned int channel
)
180 return dma_ch
[channel
].regs
->irq_status
;
182 static inline unsigned short get_dma_curr_xcount(unsigned int channel
)
184 return dma_ch
[channel
].regs
->curr_x_count
;
186 static inline unsigned short get_dma_curr_ycount(unsigned int channel
)
188 return dma_ch
[channel
].regs
->curr_y_count
;
190 static inline void *get_dma_next_desc_ptr(unsigned int channel
)
192 return dma_ch
[channel
].regs
->next_desc_ptr
;
194 static inline void *get_dma_curr_desc_ptr(unsigned int channel
)
196 return dma_ch
[channel
].regs
->curr_desc_ptr
;
198 static inline unsigned long get_dma_curr_addr(unsigned int channel
)
200 return dma_ch
[channel
].regs
->curr_addr_ptr
;
203 static inline void set_dma_sg(unsigned int channel
, struct dmasg
*sg
, int ndsize
)
205 dma_ch
[channel
].regs
->cfg
=
206 (dma_ch
[channel
].regs
->cfg
& ~(0xf << 8)) |
207 ((ndsize
& 0xf) << 8);
208 dma_ch
[channel
].regs
->next_desc_ptr
= sg
;
211 static inline int dma_channel_active(unsigned int channel
)
213 if (dma_ch
[channel
].chan_status
== DMA_CHANNEL_FREE
)
219 static inline void disable_dma(unsigned int channel
)
221 dma_ch
[channel
].regs
->cfg
&= ~DMAEN
;
223 dma_ch
[channel
].chan_status
= DMA_CHANNEL_REQUESTED
;
225 static inline void enable_dma(unsigned int channel
)
227 dma_ch
[channel
].regs
->curr_x_count
= 0;
228 dma_ch
[channel
].regs
->curr_y_count
= 0;
229 dma_ch
[channel
].regs
->cfg
|= DMAEN
;
230 dma_ch
[channel
].chan_status
= DMA_CHANNEL_ENABLED
;
232 void free_dma(unsigned int channel
);
233 int request_dma(unsigned int channel
, const char *device_id
);
234 int set_dma_callback(unsigned int channel
, irq_handler_t callback
, void *data
);
236 static inline void dma_disable_irq(unsigned int channel
)
238 disable_irq(dma_ch
[channel
].irq
);
240 static inline void dma_enable_irq(unsigned int channel
)
242 enable_irq(dma_ch
[channel
].irq
);
244 static inline void clear_dma_irqstat(unsigned int channel
)
246 dma_ch
[channel
].regs
->irq_status
= DMA_DONE
| DMA_ERR
;
249 void *dma_memcpy(void *dest
, const void *src
, size_t count
);
250 void *safe_dma_memcpy(void *dest
, const void *src
, size_t count
);
251 void blackfin_dma_early_init(void);