2 * BRIEF MODULE DESCRIPTION
3 * Defines for using and allocating dma channels on the Alchemy
4 * Au1000 mips processor.
6 * Copyright 2000 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * stevel@mvista.com or source@mvista.com
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
18 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
21 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #ifndef __ASM_AU1000_DMA_H
32 #define __ASM_AU1000_DMA_H
34 #include <asm/io.h> /* need byte IO */
35 #include <linux/spinlock.h> /* And spinlocks */
36 #include <linux/delay.h>
37 #include <asm/system.h>
39 #define NUM_AU1000_DMA_CHANNELS 8
41 /* DMA Channel Base Addresses */
42 #define DMA_CHANNEL_BASE 0xB4002000
43 #define DMA_CHANNEL_LEN 0x00000100
45 /* DMA Channel Register Offsets */
46 #define DMA_MODE_SET 0x00000000
47 #define DMA_MODE_READ DMA_MODE_SET
48 #define DMA_MODE_CLEAR 0x00000004
49 /* DMA Mode register bits follow */
50 #define DMA_DAH_MASK (0x0f << 20)
51 #define DMA_DID_BIT 16
52 #define DMA_DID_MASK (0x0f << DMA_DID_BIT)
53 #define DMA_DS (1<<15)
54 #define DMA_BE (1<<13)
55 #define DMA_DR (1<<12)
56 #define DMA_TS8 (1<<11)
58 #define DMA_DW_MASK (0x03 << DMA_DW_BIT)
59 #define DMA_DW8 (0 << DMA_DW_BIT)
60 #define DMA_DW16 (1 << DMA_DW_BIT)
61 #define DMA_DW32 (2 << DMA_DW_BIT)
64 #define DMA_HALT (1<<6)
68 #define DMA_BE1 (1<<2)
70 #define DMA_BE0 (1<<0)
72 #define DMA_PERIPHERAL_ADDR 0x00000008
73 #define DMA_BUFFER0_START 0x0000000C
74 #define DMA_BUFFER1_START 0x00000014
75 #define DMA_BUFFER0_COUNT 0x00000010
76 #define DMA_BUFFER1_COUNT 0x00000018
77 #define DMA_BAH_BIT 16
78 #define DMA_BAH_MASK (0x0f << DMA_BAH_BIT)
79 #define DMA_COUNT_BIT 0
80 #define DMA_COUNT_MASK (0xffff << DMA_COUNT_BIT)
82 /* DMA Device ID's follow */
103 /* DMA Device ID's for 2nd bank (AU1100) follow */
113 int dev_id; // this channel is allocated if >=0, free otherwise
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 irqreturn_t (*irqhandler)(int, void *,
128 unsigned long irqflags,
130 extern void free_au1000_dma(unsigned int dmanr);
131 extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
132 int length, int *eof, void *data);
133 extern void dump_au1000_dma_channel(unsigned int dmanr);
134 extern spinlock_t au1000_dma_spin_lock;
137 static __inline__ struct dma_chan *get_dma_chan(unsigned int dmanr)
139 if (dmanr >= NUM_AU1000_DMA_CHANNELS
140 || au1000_dma_table[dmanr].dev_id < 0)
142 return &au1000_dma_table[dmanr];
145 static __inline__ unsigned long claim_dma_lock(void)
148 spin_lock_irqsave(&au1000_dma_spin_lock, flags);
152 static __inline__ void release_dma_lock(unsigned long flags)
154 spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
158 * Set the DMA buffer enable bits in the mode register.
160 static __inline__ void enable_dma_buffer0(unsigned int dmanr)
162 struct dma_chan *chan = get_dma_chan(dmanr);
165 au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
167 static __inline__ void enable_dma_buffer1(unsigned int dmanr)
169 struct dma_chan *chan = get_dma_chan(dmanr);
172 au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
174 static __inline__ void enable_dma_buffers(unsigned int dmanr)
176 struct dma_chan *chan = get_dma_chan(dmanr);
179 au_writel(DMA_BE0 | DMA_BE1, chan->io + DMA_MODE_SET);
182 static __inline__ void start_dma(unsigned int dmanr)
184 struct dma_chan *chan = get_dma_chan(dmanr);
188 au_writel(DMA_GO, chan->io + DMA_MODE_SET);
191 #define DMA_HALT_POLL 0x5000
193 static __inline__ void halt_dma(unsigned int dmanr)
195 struct dma_chan *chan = get_dma_chan(dmanr);
200 au_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);
202 for (i = 0; i < DMA_HALT_POLL; i++)
203 if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
205 if (i == DMA_HALT_POLL)
206 printk(KERN_INFO "halt_dma: HALT poll expired!\n");
210 static __inline__ void disable_dma(unsigned int dmanr)
212 struct dma_chan *chan = get_dma_chan(dmanr);
218 // now we can disable the buffers
219 au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
222 static __inline__ int dma_halted(unsigned int dmanr)
224 struct dma_chan *chan = get_dma_chan(dmanr);
227 return (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT) ? 1 : 0;
230 /* initialize a DMA channel */
231 static __inline__ void init_dma(unsigned int dmanr)
233 struct dma_chan *chan = get_dma_chan(dmanr);
240 // set device FIFO address
241 au_writel(CPHYSADDR(chan->fifo_addr),
242 chan->io + DMA_PERIPHERAL_ADDR);
244 mode = chan->mode | (chan->dev_id << DMA_DID_BIT);
248 au_writel(~mode, chan->io + DMA_MODE_CLEAR);
249 au_writel(mode, chan->io + DMA_MODE_SET);
253 * set mode for a specific DMA channel
255 static __inline__ void set_dma_mode(unsigned int dmanr, unsigned int mode)
257 struct dma_chan *chan = get_dma_chan(dmanr);
261 * set_dma_mode is only allowed to change endianess, direction,
262 * transfer size, device FIFO width, and coherency settings.
263 * Make sure anything else is masked off.
265 mode &= (DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
266 chan->mode &= ~(DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
270 static __inline__ unsigned int get_dma_mode(unsigned int dmanr)
272 struct dma_chan *chan = get_dma_chan(dmanr);
278 static __inline__ int get_dma_active_buffer(unsigned int dmanr)
280 struct dma_chan *chan = get_dma_chan(dmanr);
283 return (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ? 1 : 0;
288 * set the device FIFO address for a specific DMA channel - only
289 * applicable to GPO4 and GPO5. All the other devices have fixed
292 static __inline__ void set_dma_fifo_addr(unsigned int dmanr,
295 struct dma_chan *chan = get_dma_chan(dmanr);
299 if (chan->mode & DMA_DS) /* second bank of device ids */
302 if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
305 au_writel(CPHYSADDR(a), chan->io + DMA_PERIPHERAL_ADDR);
309 * Clear the DMA buffer done bits in the mode register.
311 static __inline__ void clear_dma_done0(unsigned int dmanr)
313 struct dma_chan *chan = get_dma_chan(dmanr);
316 au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
318 static __inline__ void clear_dma_done1(unsigned int dmanr)
320 struct dma_chan *chan = get_dma_chan(dmanr);
323 au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
327 * This does nothing - not applicable to Au1000 DMA.
329 static __inline__ void set_dma_page(unsigned int dmanr, char pagenr)
334 * Set Buffer 0 transfer address for specific DMA channel.
336 static __inline__ void set_dma_addr0(unsigned int dmanr, unsigned int a)
338 struct dma_chan *chan = get_dma_chan(dmanr);
341 au_writel(a, chan->io + DMA_BUFFER0_START);
345 * Set Buffer 1 transfer address for specific DMA channel.
347 static __inline__ void set_dma_addr1(unsigned int dmanr, unsigned int a)
349 struct dma_chan *chan = get_dma_chan(dmanr);
352 au_writel(a, chan->io + DMA_BUFFER1_START);
357 * Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
359 static __inline__ void set_dma_count0(unsigned int dmanr,
362 struct dma_chan *chan = get_dma_chan(dmanr);
365 count &= DMA_COUNT_MASK;
366 au_writel(count, chan->io + DMA_BUFFER0_COUNT);
370 * Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
372 static __inline__ void set_dma_count1(unsigned int dmanr,
375 struct dma_chan *chan = get_dma_chan(dmanr);
378 count &= DMA_COUNT_MASK;
379 au_writel(count, chan->io + DMA_BUFFER1_COUNT);
383 * Set both buffer transfer sizes (max 64k) for a specific DMA channel.
385 static __inline__ void set_dma_count(unsigned int dmanr,
388 struct dma_chan *chan = get_dma_chan(dmanr);
391 count &= DMA_COUNT_MASK;
392 au_writel(count, chan->io + DMA_BUFFER0_COUNT);
393 au_writel(count, chan->io + DMA_BUFFER1_COUNT);
397 * Returns which buffer has its done bit set in the mode register.
398 * Returns -1 if neither or both done bits set.
400 static __inline__ unsigned int get_dma_buffer_done(unsigned int dmanr)
402 struct dma_chan *chan = get_dma_chan(dmanr);
406 return au_readl(chan->io + DMA_MODE_READ) & (DMA_D0 | DMA_D1);
411 * Returns the DMA channel's Buffer Done IRQ number.
413 static __inline__ int get_dma_done_irq(unsigned int dmanr)
415 struct dma_chan *chan = get_dma_chan(dmanr);
423 * Get DMA residue count. Returns the number of _bytes_ left to transfer.
425 static __inline__ int get_dma_residue(unsigned int dmanr)
427 int curBufCntReg, count;
428 struct dma_chan *chan = get_dma_chan(dmanr);
432 curBufCntReg = (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ?
433 DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;
435 count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;
437 if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
439 else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
445 #endif /* __ASM_AU1000_DMA_H */