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linux/include/asm-mips/mach-au1x00/au1000_dma.h
David Howells 40220c1a19 IRQ: Use the new typedef for interrupt handler function pointers 
Use the new typedef for interrupt handler function pointers rather than
actually spelling out the full thing each time.  This was scripted with the
following small shell script:

#!/bin/sh
egrep -nHrl -e 'irqreturn_t[ 	]*[(][*]' $* |
while read i
do
    echo $i
    perl -pi -e 's/irqreturn_t\s*[(]\s*[*]\s*([_a-zA-Z0-9]*)\s*[)]\s*[(]\s*int\s*,\s*void\s*[*]\s*[)]/irq_handler_t \1/g' $i || exit $?
done

Signed-Off-By: David Howells <dhowells@redhat.com>
2006-10-09 12:19:47 +01:00

445 lines
11 KiB
C
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/*
* BRIEF MODULE DESCRIPTION
* Defines for using and allocating dma channels on the Alchemy
* Au1000 mips processor.
*
* Copyright 2000 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* stevel@mvista.com or source@mvista.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef __ASM_AU1000_DMA_H
#define __ASM_AU1000_DMA_H
#include <asm/io.h> /* need byte IO */
#include <linux/spinlock.h> /* And spinlocks */
#include <linux/delay.h>
#include <asm/system.h>
#define NUM_AU1000_DMA_CHANNELS 8
/* DMA Channel Base Addresses */
#define DMA_CHANNEL_BASE 0xB4002000
#define DMA_CHANNEL_LEN 0x00000100
/* DMA Channel Register Offsets */
#define DMA_MODE_SET 0x00000000
#define DMA_MODE_READ DMA_MODE_SET
#define DMA_MODE_CLEAR 0x00000004
/* DMA Mode register bits follow */
#define DMA_DAH_MASK (0x0f << 20)
#define DMA_DID_BIT 16
#define DMA_DID_MASK (0x0f << DMA_DID_BIT)
#define DMA_DS (1<<15)
#define DMA_BE (1<<13)
#define DMA_DR (1<<12)
#define DMA_TS8 (1<<11)
#define DMA_DW_BIT 9
#define DMA_DW_MASK (0x03 << DMA_DW_BIT)
#define DMA_DW8 (0 << DMA_DW_BIT)
#define DMA_DW16 (1 << DMA_DW_BIT)
#define DMA_DW32 (2 << DMA_DW_BIT)
#define DMA_NC (1<<8)
#define DMA_IE (1<<7)
#define DMA_HALT (1<<6)
#define DMA_GO (1<<5)
#define DMA_AB (1<<4)
#define DMA_D1 (1<<3)
#define DMA_BE1 (1<<2)
#define DMA_D0 (1<<1)
#define DMA_BE0 (1<<0)
#define DMA_PERIPHERAL_ADDR 0x00000008
#define DMA_BUFFER0_START 0x0000000C
#define DMA_BUFFER1_START 0x00000014
#define DMA_BUFFER0_COUNT 0x00000010
#define DMA_BUFFER1_COUNT 0x00000018
#define DMA_BAH_BIT 16
#define DMA_BAH_MASK (0x0f << DMA_BAH_BIT)
#define DMA_COUNT_BIT 0
#define DMA_COUNT_MASK (0xffff << DMA_COUNT_BIT)
/* DMA Device ID's follow */
enum {
DMA_ID_UART0_TX = 0,
DMA_ID_UART0_RX,
DMA_ID_GP04,
DMA_ID_GP05,
DMA_ID_AC97C_TX,
DMA_ID_AC97C_RX,
DMA_ID_UART3_TX,
DMA_ID_UART3_RX,
DMA_ID_USBDEV_EP0_RX,
DMA_ID_USBDEV_EP0_TX,
DMA_ID_USBDEV_EP2_TX,
DMA_ID_USBDEV_EP3_TX,
DMA_ID_USBDEV_EP4_RX,
DMA_ID_USBDEV_EP5_RX,
DMA_ID_I2S_TX,
DMA_ID_I2S_RX,
DMA_NUM_DEV
};
/* DMA Device ID's for 2nd bank (AU1100) follow */
enum {
DMA_ID_SD0_TX = 0,
DMA_ID_SD0_RX,
DMA_ID_SD1_TX,
DMA_ID_SD1_RX,
DMA_NUM_DEV_BANK2
};
struct dma_chan {
int dev_id; // this channel is allocated if >=0, free otherwise
unsigned int io;
const char *dev_str;
int irq;
void *irq_dev;
unsigned int fifo_addr;
unsigned int mode;
};
/* These are in arch/mips/au1000/common/dma.c */
extern struct dma_chan au1000_dma_table[];
extern int request_au1000_dma(int dev_id,
const char *dev_str,
irq_handler_t irqhandler,
unsigned long irqflags,
void *irq_dev_id);
extern void free_au1000_dma(unsigned int dmanr);
extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
int length, int *eof, void *data);
extern void dump_au1000_dma_channel(unsigned int dmanr);
extern spinlock_t au1000_dma_spin_lock;
static __inline__ struct dma_chan *get_dma_chan(unsigned int dmanr)
{
if (dmanr >= NUM_AU1000_DMA_CHANNELS
|| au1000_dma_table[dmanr].dev_id < 0)
return NULL;
return &au1000_dma_table[dmanr];
}
static __inline__ unsigned long claim_dma_lock(void)
{
unsigned long flags;
spin_lock_irqsave(&au1000_dma_spin_lock, flags);
return flags;
}
static __inline__ void release_dma_lock(unsigned long flags)
{
spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
}
/*
* Set the DMA buffer enable bits in the mode register.
*/
static __inline__ void enable_dma_buffer0(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
}
static __inline__ void enable_dma_buffer1(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
}
static __inline__ void enable_dma_buffers(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_BE0 | DMA_BE1, chan->io + DMA_MODE_SET);
}
static __inline__ void start_dma(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_GO, chan->io + DMA_MODE_SET);
}
#define DMA_HALT_POLL 0x5000
static __inline__ void halt_dma(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
int i;
if (!chan)
return;
au_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);
// poll the halt bit
for (i = 0; i < DMA_HALT_POLL; i++)
if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
break;
if (i == DMA_HALT_POLL)
printk(KERN_INFO "halt_dma: HALT poll expired!\n");
}
static __inline__ void disable_dma(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
halt_dma(dmanr);
// now we can disable the buffers
au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
}
static __inline__ int dma_halted(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return 1;
return (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT) ? 1 : 0;
}
/* initialize a DMA channel */
static __inline__ void init_dma(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
u32 mode;
if (!chan)
return;
disable_dma(dmanr);
// set device FIFO address
au_writel(CPHYSADDR(chan->fifo_addr),
chan->io + DMA_PERIPHERAL_ADDR);
mode = chan->mode | (chan->dev_id << DMA_DID_BIT);
if (chan->irq)
mode |= DMA_IE;
au_writel(~mode, chan->io + DMA_MODE_CLEAR);
au_writel(mode, chan->io + DMA_MODE_SET);
}
/*
* set mode for a specific DMA channel
*/
static __inline__ void set_dma_mode(unsigned int dmanr, unsigned int mode)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
/*
* set_dma_mode is only allowed to change endianess, direction,
* transfer size, device FIFO width, and coherency settings.
* Make sure anything else is masked off.
*/
mode &= (DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
chan->mode &= ~(DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
chan->mode |= mode;
}
static __inline__ unsigned int get_dma_mode(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return 0;
return chan->mode;
}
static __inline__ int get_dma_active_buffer(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return -1;
return (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ? 1 : 0;
}
/*
* set the device FIFO address for a specific DMA channel - only
* applicable to GPO4 and GPO5. All the other devices have fixed
* FIFO addresses.
*/
static __inline__ void set_dma_fifo_addr(unsigned int dmanr,
unsigned int a)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
if (chan->mode & DMA_DS) /* second bank of device ids */
return;
if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
return;
au_writel(CPHYSADDR(a), chan->io + DMA_PERIPHERAL_ADDR);
}
/*
* Clear the DMA buffer done bits in the mode register.
*/
static __inline__ void clear_dma_done0(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
}
static __inline__ void clear_dma_done1(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
}
/*
* This does nothing - not applicable to Au1000 DMA.
*/
static __inline__ void set_dma_page(unsigned int dmanr, char pagenr)
{
}
/*
* Set Buffer 0 transfer address for specific DMA channel.
*/
static __inline__ void set_dma_addr0(unsigned int dmanr, unsigned int a)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(a, chan->io + DMA_BUFFER0_START);
}
/*
* Set Buffer 1 transfer address for specific DMA channel.
*/
static __inline__ void set_dma_addr1(unsigned int dmanr, unsigned int a)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
au_writel(a, chan->io + DMA_BUFFER1_START);
}
/*
* Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
*/
static __inline__ void set_dma_count0(unsigned int dmanr,
unsigned int count)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
count &= DMA_COUNT_MASK;
au_writel(count, chan->io + DMA_BUFFER0_COUNT);
}
/*
* Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
*/
static __inline__ void set_dma_count1(unsigned int dmanr,
unsigned int count)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
count &= DMA_COUNT_MASK;
au_writel(count, chan->io + DMA_BUFFER1_COUNT);
}
/*
* Set both buffer transfer sizes (max 64k) for a specific DMA channel.
*/
static __inline__ void set_dma_count(unsigned int dmanr,
unsigned int count)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return;
count &= DMA_COUNT_MASK;
au_writel(count, chan->io + DMA_BUFFER0_COUNT);
au_writel(count, chan->io + DMA_BUFFER1_COUNT);
}
/*
* Returns which buffer has its done bit set in the mode register.
* Returns -1 if neither or both done bits set.
*/
static __inline__ unsigned int get_dma_buffer_done(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return 0;
return au_readl(chan->io + DMA_MODE_READ) & (DMA_D0 | DMA_D1);
}
/*
* Returns the DMA channel's Buffer Done IRQ number.
*/
static __inline__ int get_dma_done_irq(unsigned int dmanr)
{
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return -1;
return chan->irq;
}
/*
* Get DMA residue count. Returns the number of _bytes_ left to transfer.
*/
static __inline__ int get_dma_residue(unsigned int dmanr)
{
int curBufCntReg, count;
struct dma_chan *chan = get_dma_chan(dmanr);
if (!chan)
return 0;
curBufCntReg = (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ?
DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;
count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;
if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
count <<= 1;
else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
count <<= 2;
return count;
}
#endif /* __ASM_AU1000_DMA_H */
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