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/*
* 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/io.h>
#include <asm/fsl_dma.h>
/* Controller can only transfer 2^26 - 1 bytes at a time */
#define FSL_DMA_MAX_SIZE (0x3ffffff)
#if defined(CONFIG_MPC85xx)
ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
#elif defined(CONFIG_MPC86xx)
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];
uint status;
/* While the channel is busy, spin */
do {
status = in_be32(&dma->sr);
} while (status & FSL_DMA_SR_CB);
/* clear MR[CS] channel start bit */
out_be32(&dma->mr, in_be32(&dma->mr) & ~FSL_DMA_MR_CS);
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];
out_be32(&dma->satr, FSL_DMA_SATR_SREAD_NO_SNOOP);
out_be32(&dma->datr, FSL_DMA_DATR_DWRITE_NO_SNOOP);
out_be32(&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];
uint xfer_size;
while (count) {
xfer_size = MIN(FSL_DMA_MAX_SIZE, count);
out_be32(&dma->dar, (uint) dest);
out_be32(&dma->sar, (uint) src);
out_be32(&dma->bcr, xfer_size);
/* Disable bandwidth control, use direct transfer mode */
out_be32(&dma->mr, FSL_DMA_MR_BWC_DIS | FSL_DMA_MR_CTM_DIRECT);
dma_sync();
/* Start the transfer */
out_be32(&dma->mr, FSL_DMA_MR_BWC_DIS |
FSL_DMA_MR_CTM_DIRECT |
FSL_DMA_MR_CS);
count -= xfer_size;
src += xfer_size;
dest += xfer_size;
dma_sync();
if (dma_check())
return -1;
}
return 0;
}
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