upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.6 KiB
99 lines
2.6 KiB
/*
|
|
* Generic bounce buffer implementation
|
|
*
|
|
* Copyright (C) 2012 Marek Vasut <marex@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 <common.h>
|
|
#include <malloc.h>
|
|
#include <errno.h>
|
|
#include <bouncebuf.h>
|
|
|
|
static int addr_aligned(struct bounce_buffer *state)
|
|
{
|
|
const ulong align_mask = ARCH_DMA_MINALIGN - 1;
|
|
|
|
/* Check if start is aligned */
|
|
if ((ulong)state->user_buffer & align_mask) {
|
|
debug("Unaligned buffer address %p\n", state->user_buffer);
|
|
return 0;
|
|
}
|
|
|
|
/* Check if length is aligned */
|
|
if (state->len != state->len_aligned) {
|
|
debug("Unaligned buffer length %d\n", state->len);
|
|
return 0;
|
|
}
|
|
|
|
/* Aligned */
|
|
return 1;
|
|
}
|
|
|
|
int bounce_buffer_start(struct bounce_buffer *state, void *data,
|
|
size_t len, unsigned int flags)
|
|
{
|
|
state->user_buffer = data;
|
|
state->bounce_buffer = data;
|
|
state->len = len;
|
|
state->len_aligned = roundup(len, ARCH_DMA_MINALIGN);
|
|
state->flags = flags;
|
|
|
|
if (!addr_aligned(state)) {
|
|
state->bounce_buffer = memalign(ARCH_DMA_MINALIGN,
|
|
state->len_aligned);
|
|
if (!state->bounce_buffer)
|
|
return -ENOMEM;
|
|
|
|
if (state->flags & GEN_BB_READ)
|
|
memcpy(state->bounce_buffer, state->user_buffer,
|
|
state->len);
|
|
}
|
|
|
|
/*
|
|
* Flush data to RAM so DMA reads can pick it up,
|
|
* and any CPU writebacks don't race with DMA writes
|
|
*/
|
|
flush_dcache_range((unsigned long)state->bounce_buffer,
|
|
(unsigned long)(state->bounce_buffer) +
|
|
state->len_aligned);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bounce_buffer_stop(struct bounce_buffer *state)
|
|
{
|
|
if (state->flags & GEN_BB_WRITE) {
|
|
/* Invalidate cache so that CPU can see any newly DMA'd data */
|
|
invalidate_dcache_range((unsigned long)state->bounce_buffer,
|
|
(unsigned long)(state->bounce_buffer) +
|
|
state->len_aligned);
|
|
}
|
|
|
|
if (state->bounce_buffer == state->user_buffer)
|
|
return 0;
|
|
|
|
if (state->flags & GEN_BB_WRITE)
|
|
memcpy(state->user_buffer, state->bounce_buffer, state->len);
|
|
|
|
free(state->bounce_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|