diff options
Diffstat (limited to 'include/asm-mips/mach-au1x00/au1000_dma.h')
| -rw-r--r-- | include/asm-mips/mach-au1x00/au1000_dma.h | 179 |
1 files changed, 96 insertions, 83 deletions
diff --git a/include/asm-mips/mach-au1x00/au1000_dma.h b/include/asm-mips/mach-au1x00/au1000_dma.h index 9f29520e8fb..c333b4e1cd4 100644 --- a/include/asm-mips/mach-au1x00/au1000_dma.h +++ b/include/asm-mips/mach-au1x00/au1000_dma.h @@ -1,11 +1,10 @@ /* * 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 @@ -31,7 +30,7 @@ #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> @@ -50,36 +49,36 @@ #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, @@ -110,7 +109,8 @@ enum { }; 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; @@ -132,23 +132,23 @@ extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos, 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); } @@ -156,48 +156,53 @@ static __inline__ void release_dma_lock(unsigned long 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; @@ -205,55 +210,57 @@ static __inline__ void halt_dma(unsigned int dmanr) 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; /* @@ -266,36 +273,37 @@ static __inline__ void set_dma_mode(unsigned int dmanr, unsigned int mode) 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) @@ -307,16 +315,19 @@ static __inline__ void set_dma_fifo_addr(unsigned int dmanr, /* * 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); @@ -325,16 +336,17 @@ static __inline__ void clear_dma_done1(unsigned int dmanr) /* * 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); @@ -343,9 +355,10 @@ static __inline__ void set_dma_addr0(unsigned int dmanr, unsigned int a) /* * 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); @@ -355,10 +368,10 @@ static __inline__ void set_dma_addr1(unsigned int dmanr, unsigned int a) /* * 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; @@ -368,10 +381,10 @@ static __inline__ void set_dma_count0(unsigned int dmanr, /* * 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; @@ -381,10 +394,10 @@ static __inline__ void set_dma_count1(unsigned int dmanr, /* * 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; @@ -396,35 +409,36 @@ static __inline__ void set_dma_count(unsigned int dmanr, * 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; @@ -442,4 +456,3 @@ static __inline__ int get_dma_residue(unsigned int dmanr) } #endif /* __ASM_AU1000_DMA_H */ - |