diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/Makefile | 1 | ||||
| -rw-r--r-- | drivers/dma/fsl_dma.c | 92 |
2 files changed, 93 insertions, 0 deletions
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index cf29efa..36d99f9 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk LIB := $(obj)libdma.a COBJS-$(CONFIG_FSLDMAFEC) += MCD_tasksInit.o MCD_dmaApi.o MCD_tasks.o +COBJS-$(CONFIG_FSL_DMA) += fsl_dma.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/dma/fsl_dma.c b/drivers/dma/fsl_dma.c new file mode 100644 index 0000000..a9989ee --- /dev/null +++ b/drivers/dma/fsl_dma.c @@ -0,0 +1,92 @@ +/* + * Copyright 2004,2007,2008 Freescale Semiconductor, Inc. + * (C) Copyright 2002, 2003 Motorola Inc. + * Xianghua Xiao (X.Xiao@motorola.com) + * + * (C) Copyright 2000 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <common.h> +#include <asm/fsl_dma.h> + +#if defined(CONFIG_MPC85xx) +volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR); +#elif defined(CONFIG_MPC86xx) +volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR); +#else +#error "Freescale DMA engine not supported on your processor" +#endif + +static void dma_sync(void) +{ +#if defined(CONFIG_MPC85xx) + asm("sync; isync; msync"); +#elif defined(CONFIG_MPC86xx) + asm("sync; isync"); +#endif +} + +static uint dma_check(void) { + volatile fsl_dma_t *dma = &dma_base->dma[0]; + volatile uint status = dma->sr; + + /* While the channel is busy, spin */ + while (status & 4) + status = dma->sr; + + /* clear MR[CS] channel start bit */ + dma->mr &= 1; + dma_sync(); + + if (status != 0) + printf ("DMA Error: status = %x\n", status); + + return status; +} + +void dma_init(void) { + volatile fsl_dma_t *dma = &dma_base->dma[0]; + + dma->satr = 0x00040000; + dma->datr = 0x00040000; + dma->sr = 0xffffffff; /* clear any errors */ + dma_sync(); +} + +int dma_xfer(void *dest, uint count, void *src) { + volatile fsl_dma_t *dma = &dma_base->dma[0]; + + dma->dar = (uint) dest; + dma->sar = (uint) src; + dma->bcr = count; + + /* Disable bandwidth control, use direct transfer mode */ + dma->mr = 0xf000004; + dma_sync(); + + /* Start the transfer */ + dma->mr = 0xf000005; + dma_sync(); + + return dma_check(); +} |