diff options
Diffstat (limited to 'arch/cris/include/arch-v32/arch/hwregs/dma.h')
| -rw-r--r-- | arch/cris/include/arch-v32/arch/hwregs/dma.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v32/arch/hwregs/dma.h b/arch/cris/include/arch-v32/arch/hwregs/dma.h new file mode 100644 index 000000000000..3ce322b5c731 --- /dev/null +++ b/arch/cris/include/arch-v32/arch/hwregs/dma.h @@ -0,0 +1,127 @@ +/* + * DMA C definitions and help macros + * + */ + +#ifndef dma_h +#define dma_h + +/* registers */ /* Really needed, since both are listed in sw.list? */ +#include "dma_defs.h" + + +/* descriptors */ + +// ------------------------------------------------------------ dma_descr_group +typedef struct dma_descr_group { + struct dma_descr_group *next; + unsigned eol : 1; + unsigned tol : 1; + unsigned bol : 1; + unsigned : 1; + unsigned intr : 1; + unsigned : 2; + unsigned en : 1; + unsigned : 7; + unsigned dis : 1; + unsigned md : 16; + struct dma_descr_group *up; + union { + struct dma_descr_context *context; + struct dma_descr_group *group; + } down; +} dma_descr_group; + +// ---------------------------------------------------------- dma_descr_context +typedef struct dma_descr_context { + struct dma_descr_context *next; + unsigned eol : 1; + unsigned : 3; + unsigned intr : 1; + unsigned : 1; + unsigned store_mode : 1; + unsigned en : 1; + unsigned : 7; + unsigned dis : 1; + unsigned md0 : 16; + unsigned md1; + unsigned md2; + unsigned md3; + unsigned md4; + struct dma_descr_data *saved_data; + char *saved_data_buf; +} dma_descr_context; + +// ------------------------------------------------------------- dma_descr_data +typedef struct dma_descr_data { + struct dma_descr_data *next; + char *buf; + unsigned eol : 1; + unsigned : 2; + unsigned out_eop : 1; + unsigned intr : 1; + unsigned wait : 1; + unsigned : 2; + unsigned : 3; + unsigned in_eop : 1; + unsigned : 4; + unsigned md : 16; + char *after; +} dma_descr_data; + +// --------------------------------------------------------------------- macros + +// enable DMA channel +#define DMA_ENABLE( inst ) \ + do { reg_dma_rw_cfg e = REG_RD( dma, inst, rw_cfg );\ + e.en = regk_dma_yes; \ + REG_WR( dma, inst, rw_cfg, e); } while( 0 ) + +// reset DMA channel +#define DMA_RESET( inst ) \ + do { reg_dma_rw_cfg r = REG_RD( dma, inst, rw_cfg );\ + r.en = regk_dma_no; \ + REG_WR( dma, inst, rw_cfg, r); } while( 0 ) + +// stop DMA channel +#define DMA_STOP( inst ) \ + do { reg_dma_rw_cfg s = REG_RD( dma, inst, rw_cfg );\ + s.stop = regk_dma_yes; \ + REG_WR( dma, inst, rw_cfg, s); } while( 0 ) + +// continue DMA channel operation +#define DMA_CONTINUE( inst ) \ + do { reg_dma_rw_cfg c = REG_RD( dma, inst, rw_cfg );\ + c.stop = regk_dma_no; \ + REG_WR( dma, inst, rw_cfg, c); } while( 0 ) + +// give stream command +#define DMA_WR_CMD( inst, cmd_par ) \ + do { reg_dma_rw_stream_cmd __x = {0}; \ + do { __x = REG_RD(dma, inst, rw_stream_cmd); } while (__x.busy); \ + __x.cmd = (cmd_par); \ + REG_WR(dma, inst, rw_stream_cmd, __x); \ + } while (0) + +// load: g,c,d:burst +#define DMA_START_GROUP( inst, group_descr ) \ + do { REG_WR_INT( dma, inst, rw_group, (int) group_descr ); \ + DMA_WR_CMD( inst, regk_dma_load_g ); \ + DMA_WR_CMD( inst, regk_dma_load_c ); \ + DMA_WR_CMD( inst, regk_dma_load_d | regk_dma_burst ); \ + } while( 0 ) + +// load: c,d:burst +#define DMA_START_CONTEXT( inst, ctx_descr ) \ + do { REG_WR_INT( dma, inst, rw_group_down, (int) ctx_descr ); \ + DMA_WR_CMD( inst, regk_dma_load_c ); \ + DMA_WR_CMD( inst, regk_dma_load_d | regk_dma_burst ); \ + } while( 0 ) + +// if the DMA is at the end of the data list, the last data descr is reloaded +#define DMA_CONTINUE_DATA( inst ) \ +do { reg_dma_rw_cmd c = {0}; \ + c.cont_data = regk_dma_yes;\ + REG_WR( dma, inst, rw_cmd, c ); } while( 0 ) + +#endif |