2 * BRIEF MODULE DESCRIPTION
3 * Defines for using and allocating DMA channels on the Alchemy
4 * Au1x00 MIPS processors.
6 * Copyright 2000, 2008 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc. <source@mvista.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
17 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
20 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 * You should have received a copy of the GNU General Public License along
26 * with this program; if not, write to the Free Software Foundation, Inc.,
27 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 #ifndef __ASM_AU1000_DMA_H
31 #define __ASM_AU1000_DMA_H
33 #include <linux/io.h> /* need byte IO */
34 #include <linux/spinlock.h> /* And spinlocks */
35 #include <linux/delay.h>
36 #include <asm/system.h>
38 #define NUM_AU1000_DMA_CHANNELS 8
40 /* DMA Channel Base Addresses */
41 #define DMA_CHANNEL_BASE 0xB4002000
42 #define DMA_CHANNEL_LEN 0x00000100
44 /* DMA Channel Register Offsets */
45 #define DMA_MODE_SET 0x00000000
46 #define DMA_MODE_READ DMA_MODE_SET
47 #define DMA_MODE_CLEAR 0x00000004
48 /* DMA Mode register bits follow */
49 #define DMA_DAH_MASK (0x0f << 20)
50 #define DMA_DID_BIT 16
51 #define DMA_DID_MASK (0x0f << DMA_DID_BIT)
52 #define DMA_DS (1 << 15)
53 #define DMA_BE (1 << 13)
54 #define DMA_DR (1 << 12)
55 #define DMA_TS8 (1 << 11)
57 #define DMA_DW_MASK (0x03 << DMA_DW_BIT)
58 #define DMA_DW8 (0 << DMA_DW_BIT)
59 #define DMA_DW16 (1 << DMA_DW_BIT)
60 #define DMA_DW32 (2 << DMA_DW_BIT)
61 #define DMA_NC (1 << 8)
62 #define DMA_IE (1 << 7)
63 #define DMA_HALT (1 << 6)
64 #define DMA_GO (1 << 5)
65 #define DMA_AB (1 << 4)
66 #define DMA_D1 (1 << 3)
67 #define DMA_BE1 (1 << 2)
68 #define DMA_D0 (1 << 1)
69 #define DMA_BE0 (1 << 0)
71 #define DMA_PERIPHERAL_ADDR 0x00000008
72 #define DMA_BUFFER0_START 0x0000000C
73 #define DMA_BUFFER1_START 0x00000014
74 #define DMA_BUFFER0_COUNT 0x00000010
75 #define DMA_BUFFER1_COUNT 0x00000018
76 #define DMA_BAH_BIT 16
77 #define DMA_BAH_MASK (0x0f << DMA_BAH_BIT)
78 #define DMA_COUNT_BIT 0
79 #define DMA_COUNT_MASK (0xffff << DMA_COUNT_BIT)
81 /* DMA Device IDs follow */
102 /* DMA Device ID's for 2nd bank (AU1100) follow */
112 int dev_id; /* this channel is allocated if >= 0, */
118 unsigned int fifo_addr;
122 /* These are in arch/mips/au1000/common/dma.c */
123 extern struct dma_chan au1000_dma_table[];
124 extern int request_au1000_dma(int dev_id,
126 irq_handler_t irqhandler,
127 unsigned long irqflags,
129 extern void free_au1000_dma(unsigned int dmanr);
130 extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
131 int length, int *eof, void *data);
132 extern void dump_au1000_dma_channel(unsigned int dmanr);
133 extern spinlock_t au1000_dma_spin_lock;
135 static inline struct dma_chan *get_dma_chan(unsigned int dmanr)
137 if (dmanr >= NUM_AU1000_DMA_CHANNELS ||
138 au1000_dma_table[dmanr].dev_id < 0)
140 return &au1000_dma_table[dmanr];
143 static inline unsigned long claim_dma_lock(void)
147 spin_lock_irqsave(&au1000_dma_spin_lock, flags);
151 static inline void release_dma_lock(unsigned long flags)
153 spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
157 * Set the DMA buffer enable bits in the mode register.
159 static inline void enable_dma_buffer0(unsigned int dmanr)
161 struct dma_chan *chan = get_dma_chan(dmanr);
165 au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
168 static inline void enable_dma_buffer1(unsigned int dmanr)
170 struct dma_chan *chan = get_dma_chan(dmanr);
174 au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
176 static inline void enable_dma_buffers(unsigned int dmanr)
178 struct dma_chan *chan = get_dma_chan(dmanr);
182 au_writel(DMA_BE0 | DMA_BE1, chan->io + DMA_MODE_SET);
185 static inline void start_dma(unsigned int dmanr)
187 struct dma_chan *chan = get_dma_chan(dmanr);
191 au_writel(DMA_GO, chan->io + DMA_MODE_SET);
194 #define DMA_HALT_POLL 0x5000
196 static inline void halt_dma(unsigned int dmanr)
198 struct dma_chan *chan = get_dma_chan(dmanr);
203 au_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);
205 /* Poll the halt bit */
206 for (i = 0; i < DMA_HALT_POLL; i++)
207 if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
209 if (i == DMA_HALT_POLL)
210 printk(KERN_INFO "halt_dma: HALT poll expired!\n");
213 static inline void disable_dma(unsigned int dmanr)
215 struct dma_chan *chan = get_dma_chan(dmanr);
222 /* Now we can disable the buffers */
223 au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
226 static inline int dma_halted(unsigned int dmanr)
228 struct dma_chan *chan = get_dma_chan(dmanr);
232 return (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT) ? 1 : 0;
235 /* Initialize a DMA channel. */
236 static inline void init_dma(unsigned int dmanr)
238 struct dma_chan *chan = get_dma_chan(dmanr);
246 /* Set device FIFO address */
247 au_writel(CPHYSADDR(chan->fifo_addr), chan->io + DMA_PERIPHERAL_ADDR);
249 mode = chan->mode | (chan->dev_id << DMA_DID_BIT);
253 au_writel(~mode, chan->io + DMA_MODE_CLEAR);
254 au_writel(mode, chan->io + DMA_MODE_SET);
258 * Set mode for a specific DMA channel
260 static inline void set_dma_mode(unsigned int dmanr, unsigned int mode)
262 struct dma_chan *chan = get_dma_chan(dmanr);
267 * set_dma_mode is only allowed to change endianess, direction,
268 * transfer size, device FIFO width, and coherency settings.
269 * Make sure anything else is masked off.
271 mode &= (DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
272 chan->mode &= ~(DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
276 static inline unsigned int get_dma_mode(unsigned int dmanr)
278 struct dma_chan *chan = get_dma_chan(dmanr);
285 static inline int get_dma_active_buffer(unsigned int dmanr)
287 struct dma_chan *chan = get_dma_chan(dmanr);
291 return (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ? 1 : 0;
295 * Set the device FIFO address for a specific DMA channel - only
296 * applicable to GPO4 and GPO5. All the other devices have fixed
299 static inline void set_dma_fifo_addr(unsigned int dmanr, unsigned int a)
301 struct dma_chan *chan = get_dma_chan(dmanr);
306 if (chan->mode & DMA_DS) /* second bank of device IDs */
309 if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
312 au_writel(CPHYSADDR(a), chan->io + DMA_PERIPHERAL_ADDR);
316 * Clear the DMA buffer done bits in the mode register.
318 static inline void clear_dma_done0(unsigned int dmanr)
320 struct dma_chan *chan = get_dma_chan(dmanr);
324 au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
327 static inline void clear_dma_done1(unsigned int dmanr)
329 struct dma_chan *chan = get_dma_chan(dmanr);
333 au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
337 * This does nothing - not applicable to Au1000 DMA.
339 static inline void set_dma_page(unsigned int dmanr, char pagenr)
344 * Set Buffer 0 transfer address for specific DMA channel.
346 static inline void set_dma_addr0(unsigned int dmanr, unsigned int a)
348 struct dma_chan *chan = get_dma_chan(dmanr);
352 au_writel(a, chan->io + DMA_BUFFER0_START);
356 * Set Buffer 1 transfer address for specific DMA channel.
358 static inline void set_dma_addr1(unsigned int dmanr, unsigned int a)
360 struct dma_chan *chan = get_dma_chan(dmanr);
364 au_writel(a, chan->io + DMA_BUFFER1_START);
369 * Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
371 static inline void set_dma_count0(unsigned int dmanr, unsigned int count)
373 struct dma_chan *chan = get_dma_chan(dmanr);
377 count &= DMA_COUNT_MASK;
378 au_writel(count, chan->io + DMA_BUFFER0_COUNT);
382 * Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
384 static inline void set_dma_count1(unsigned int dmanr, unsigned int count)
386 struct dma_chan *chan = get_dma_chan(dmanr);
390 count &= DMA_COUNT_MASK;
391 au_writel(count, chan->io + DMA_BUFFER1_COUNT);
395 * Set both buffer transfer sizes (max 64k) for a specific DMA channel.
397 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
399 struct dma_chan *chan = get_dma_chan(dmanr);
403 count &= DMA_COUNT_MASK;
404 au_writel(count, chan->io + DMA_BUFFER0_COUNT);
405 au_writel(count, chan->io + DMA_BUFFER1_COUNT);
409 * Returns which buffer has its done bit set in the mode register.
410 * Returns -1 if neither or both done bits set.
412 static inline unsigned int get_dma_buffer_done(unsigned int dmanr)
414 struct dma_chan *chan = get_dma_chan(dmanr);
418 return au_readl(chan->io + DMA_MODE_READ) & (DMA_D0 | DMA_D1);
423 * Returns the DMA channel's Buffer Done IRQ number.
425 static inline int get_dma_done_irq(unsigned int dmanr)
427 struct dma_chan *chan = get_dma_chan(dmanr);
435 * Get DMA residue count. Returns the number of _bytes_ left to transfer.
437 static inline int get_dma_residue(unsigned int dmanr)
439 int curBufCntReg, count;
440 struct dma_chan *chan = get_dma_chan(dmanr);
445 curBufCntReg = (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ?
446 DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;
448 count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;
450 if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
452 else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
458 #endif /* __ASM_AU1000_DMA_H */