diff options
Diffstat (limited to 'arch/blackfin/include/asm/dma.h')
| -rw-r--r-- | arch/blackfin/include/asm/dma.h | 93 |
1 files changed, 54 insertions, 39 deletions
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h index c9a5962..bd2e622 100644 --- a/arch/blackfin/include/asm/dma.h +++ b/arch/blackfin/include/asm/dma.h @@ -10,46 +10,70 @@ #include <linux/interrupt.h> #include <mach/dma.h> +#include <asm/atomic.h> #include <asm/blackfin.h> #include <asm/page.h> - -#define MAX_DMA_ADDRESS PAGE_OFFSET - -/***************************************************************************** -* Generic DMA Declarations -* -****************************************************************************/ -enum dma_chan_status { - DMA_CHANNEL_FREE, - DMA_CHANNEL_REQUESTED, - DMA_CHANNEL_ENABLED, -}; +#include <asm-generic/dma.h> + +/* DMA_CONFIG Masks */ +#define DMAEN 0x0001 /* DMA Channel Enable */ +#define WNR 0x0002 /* Channel Direction (W/R*) */ +#define WDSIZE_8 0x0000 /* Transfer Word Size = 8 */ +#define WDSIZE_16 0x0004 /* Transfer Word Size = 16 */ +#define WDSIZE_32 0x0008 /* Transfer Word Size = 32 */ +#define DMA2D 0x0010 /* DMA Mode (2D/1D*) */ +#define RESTART 0x0020 /* DMA Buffer Clear */ +#define DI_SEL 0x0040 /* Data Interrupt Timing Select */ +#define DI_EN 0x0080 /* Data Interrupt Enable */ +#define NDSIZE_0 0x0000 /* Next Descriptor Size = 0 (Stop/Autobuffer) */ +#define NDSIZE_1 0x0100 /* Next Descriptor Size = 1 */ +#define NDSIZE_2 0x0200 /* Next Descriptor Size = 2 */ +#define NDSIZE_3 0x0300 /* Next Descriptor Size = 3 */ +#define NDSIZE_4 0x0400 /* Next Descriptor Size = 4 */ +#define NDSIZE_5 0x0500 /* Next Descriptor Size = 5 */ +#define NDSIZE_6 0x0600 /* Next Descriptor Size = 6 */ +#define NDSIZE_7 0x0700 /* Next Descriptor Size = 7 */ +#define NDSIZE_8 0x0800 /* Next Descriptor Size = 8 */ +#define NDSIZE_9 0x0900 /* Next Descriptor Size = 9 */ +#define NDSIZE 0x0f00 /* Next Descriptor Size */ +#define DMAFLOW 0x7000 /* Flow Control */ +#define DMAFLOW_STOP 0x0000 /* Stop Mode */ +#define DMAFLOW_AUTO 0x1000 /* Autobuffer Mode */ +#define DMAFLOW_ARRAY 0x4000 /* Descriptor Array Mode */ +#define DMAFLOW_SMALL 0x6000 /* Small Model Descriptor List Mode */ +#define DMAFLOW_LARGE 0x7000 /* Large Model Descriptor List Mode */ + +/* DMA_IRQ_STATUS Masks */ +#define DMA_DONE 0x0001 /* DMA Completion Interrupt Status */ +#define DMA_ERR 0x0002 /* DMA Error Interrupt Status */ +#define DFETCH 0x0004 /* DMA Descriptor Fetch Indicator */ +#define DMA_RUN 0x0008 /* DMA Channel Running Indicator */ /*------------------------- * config reg bits value *-------------------------*/ -#define DATA_SIZE_8 0 -#define DATA_SIZE_16 1 -#define DATA_SIZE_32 2 +#define DATA_SIZE_8 0 +#define DATA_SIZE_16 1 +#define DATA_SIZE_32 2 -#define DMA_FLOW_STOP 0 -#define DMA_FLOW_AUTO 1 -#define DMA_FLOW_ARRAY 4 -#define DMA_FLOW_SMALL 6 -#define DMA_FLOW_LARGE 7 +#define DMA_FLOW_STOP 0 +#define DMA_FLOW_AUTO 1 +#define DMA_FLOW_ARRAY 4 +#define DMA_FLOW_SMALL 6 +#define DMA_FLOW_LARGE 7 -#define DIMENSION_LINEAR 0 -#define DIMENSION_2D 1 +#define DIMENSION_LINEAR 0 +#define DIMENSION_2D 1 -#define DIR_READ 0 -#define DIR_WRITE 1 +#define DIR_READ 0 +#define DIR_WRITE 1 -#define INTR_DISABLE 0 -#define INTR_ON_BUF 2 -#define INTR_ON_ROW 3 +#define INTR_DISABLE 0 +#define INTR_ON_BUF 2 +#define INTR_ON_ROW 3 #define DMA_NOSYNC_KEEP_DMA_BUF 0 -#define DMA_SYNC_RESTART 1 +#define DMA_SYNC_RESTART 1 struct dmasg { void *next_desc_addr; @@ -104,11 +128,9 @@ struct dma_register { }; -struct mutex; struct dma_channel { - struct mutex dmalock; const char *device_id; - enum dma_chan_status chan_status; + atomic_t chan_status; volatile struct dma_register *regs; struct dmasg *sg; /* large mode descriptor */ unsigned int irq; @@ -220,27 +242,20 @@ static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize static inline int dma_channel_active(unsigned int channel) { - if (dma_ch[channel].chan_status == DMA_CHANNEL_FREE) - return 0; - else - return 1; + return atomic_read(&dma_ch[channel].chan_status); } static inline void disable_dma(unsigned int channel) { dma_ch[channel].regs->cfg &= ~DMAEN; SSYNC(); - dma_ch[channel].chan_status = DMA_CHANNEL_REQUESTED; } static inline void enable_dma(unsigned int channel) { dma_ch[channel].regs->curr_x_count = 0; dma_ch[channel].regs->curr_y_count = 0; dma_ch[channel].regs->cfg |= DMAEN; - dma_ch[channel].chan_status = DMA_CHANNEL_ENABLED; } -void free_dma(unsigned int channel); -int request_dma(unsigned int channel, const char *device_id); int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data); static inline void dma_disable_irq(unsigned int channel) |