/*
* BRIEF MODULE DESCRIPTION
- * Defines for using and allocating dma channels on the Alchemy
- * Au1000 mips processor.
+ * Defines for using and allocating DMA channels on the Alchemy
+ * Au1x00 MIPS processors.
*
- * Copyright 2000 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- * stevel@mvista.com or source@mvista.com
+ * Copyright 2000, 2008 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc. <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
#ifndef __ASM_AU1000_DMA_H
#define __ASM_AU1000_DMA_H
-#include <asm/io.h> /* need byte IO */
+#include <linux/io.h> /* need byte IO */
#include <linux/spinlock.h> /* And spinlocks */
#include <linux/delay.h>
#include <asm/system.h>
#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_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 */
+#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 IDs follow */
enum {
DMA_ID_UART0_TX = 0,
DMA_ID_UART0_RX,
};
struct dma_chan {
- int dev_id; // this channel is allocated if >=0, free otherwise
+ int dev_id; /* this channel is allocated if >= 0, */
+ /* free otherwise */
unsigned int io;
const char *dev_str;
int irq;
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)
+static inline struct dma_chan *get_dma_chan(unsigned int dmanr)
{
- if (dmanr >= NUM_AU1000_DMA_CHANNELS
- || au1000_dma_table[dmanr].dev_id < 0)
+ 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)
+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)
+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)
+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)
+
+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)
+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)
+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)
+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
+
+ /* Poll the halt bit */
for (i = 0; i < DMA_HALT_POLL; i++)
if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
break;
printk(KERN_INFO "halt_dma: HALT poll expired!\n");
}
-
-static __inline__ void disable_dma(unsigned int dmanr)
+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
+ /* Now we can disable the buffers */
au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
}
-static __inline__ int dma_halted(unsigned int dmanr)
+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)
+/* 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);
+ /* 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);
+ au_writel(mode, chan->io + DMA_MODE_SET);
}
/*
- * set mode for a specific DMA channel
+ * Set mode for a specific DMA channel
*/
-static __inline__ void set_dma_mode(unsigned int dmanr, unsigned int mode)
+static inline void set_dma_mode(unsigned int dmanr, unsigned int mode)
{
struct dma_chan *chan = get_dma_chan(dmanr);
+
if (!chan)
return;
/*
chan->mode |= mode;
}
-static __inline__ unsigned int get_dma_mode(unsigned int dmanr)
+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)
+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
+ * 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)
+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 */
+ if (chan->mode & DMA_DS) /* second bank of device IDs */
return;
if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
/*
* Clear the DMA buffer done bits in the mode register.
*/
-static __inline__ void clear_dma_done0(unsigned int dmanr)
+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)
+
+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)
+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)
+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)
+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)
+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;
/*
* Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
*/
-static __inline__ void set_dma_count1(unsigned int dmanr,
- unsigned int count)
+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;
/*
* Set both buffer transfer sizes (max 64k) for a specific DMA channel.
*/
-static __inline__ void set_dma_count(unsigned int dmanr,
- unsigned int count)
+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;
* 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)
+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);
+ 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)
+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)
+static inline int get_dma_residue(unsigned int dmanr)
{
int curBufCntReg, count;
struct dma_chan *chan = get_dma_chan(dmanr);
+
if (!chan)
return 0;
}
#endif /* __ASM_AU1000_DMA_H */
-
projects / linux-2.6-omap-h63xx.git / blobdiff