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ARM: mx3/pcm037: properly allocate memory for mx3-camera

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There is no need to memzero the buffer because dma_alloc_coherent zeros
the memory for us.

This fixes:

	BUG: Your driver calls ioremap() on system memory.  This leads
	<4>to architecturally unpredictable behaviour on ARMv6+, and ioremap()
	<4>will fail in the next kernel release.  Please fix your driver.

Tested-by: Michael Grzeschik <mgr@pengutronix.de>
LAKML-Reference: 1299271882-2130-3-git-send-email-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Uwe Kleine-König 2011-03-03 11:39:42 +01:00 committed by Sascha Hauer
parent 83422671c3
commit dca7c0b429
1 changed files with 18 additions and 16 deletions
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34
arch/arm/mach-mx3/mach-pcm037.c
View file

@ -31,6 +31,7 @@
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <media/soc_camera.h>
@ -410,25 +411,16 @@ struct mx3_camera_pdata camera_pdata = {
.mclk_10khz = 2000,
};
static int __init pcm037_camera_alloc_dma(const size_t buf_size)
static phys_addr_t mx3_camera_base __initdata;
#define MX3_CAMERA_BUF_SIZE SZ_4M
static int __init pcm037_camera_alloc_dma(void)
{
dma_addr_t dma_handle;
void *buf;
int dma;
if (buf_size < 2 * 1024 * 1024)
return -EINVAL;
buf = dma_alloc_coherent(NULL, buf_size, &dma_handle, GFP_KERNEL);
if (!buf) {
pr_err("%s: cannot allocate camera buffer-memory\n", __func__);
return -ENOMEM;
}
memset(buf, 0, buf_size);
dma = dma_declare_coherent_memory(&mx3_camera.dev,
dma_handle, dma_handle, buf_size,
mx3_camera_base, mx3_camera_base,
MX3_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
/* The way we call dma_declare_coherent_memory only a malloc can fail */
@ -649,7 +641,7 @@ static void __init pcm037_init(void)
else
iclink_mt9t031.power = NULL;
if (!pcm037_camera_alloc_dma(4 * 1024 * 1024))
if (!pcm037_camera_alloc_dma())
mxc_register_device(&mx3_camera, &camera_pdata);
platform_device_register(&pcm970_sja1000);
@ -680,9 +672,19 @@ struct sys_timer pcm037_timer = {
.init = pcm037_timer_init,
};
static void __init pcm037_reserve(void)
{
/* reserve 4 MiB for mx3-camera */
mx3_camera_base = memblock_alloc(MX3_CAMERA_BUF_SIZE,
MX3_CAMERA_BUF_SIZE);
memblock_free(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
memblock_remove(mx3_camera_base, MX3_CAMERA_BUF_SIZE);
}
MACHINE_START(PCM037, "Phytec Phycore pcm037")
/* Maintainer: Pengutronix */
.boot_params = MX3x_PHYS_OFFSET + 0x100,
.reserve = pcm037_reserve,
.map_io = mx31_map_io,
.init_early = imx31_init_early,
.init_irq = mx31_init_irq,