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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/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();
}
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