// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Early setup for Rockchip DMA CMA
|
*
|
* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
|
* Author: Simon Xue <xxm@rock-chips.com>
|
*/
|
|
#include <linux/cma.h>
|
#include <linux/dma-map-ops.h>
|
|
#include "rk-dma-heap.h"
|
|
#define RK_DMA_HEAP_CMA_DEFAULT_SIZE SZ_32M
|
|
static unsigned long rk_dma_heap_size __initdata;
|
static unsigned long rk_dma_heap_base __initdata;
|
|
static struct cma *rk_dma_heap_cma;
|
|
static int __init early_dma_heap_cma(char *p)
|
{
|
if (!p) {
|
pr_err("Config string not provided\n");
|
return -EINVAL;
|
}
|
|
rk_dma_heap_size = memparse(p, &p);
|
if (*p != '@')
|
return 0;
|
|
rk_dma_heap_base = memparse(p + 1, &p);
|
|
return 0;
|
}
|
early_param("rk_dma_heap_cma", early_dma_heap_cma);
|
|
#ifndef CONFIG_DMA_CMA
|
void __weak
|
dma_contiguous_early_fixup(phys_addr_t base, unsigned long size)
|
{
|
}
|
#endif
|
|
int __init rk_dma_heap_cma_setup(void)
|
{
|
unsigned long size;
|
int ret;
|
bool fix = false;
|
|
if (rk_dma_heap_size)
|
size = rk_dma_heap_size;
|
else
|
size = RK_DMA_HEAP_CMA_DEFAULT_SIZE;
|
|
if (rk_dma_heap_base)
|
fix = true;
|
|
ret = cma_declare_contiguous(rk_dma_heap_base, PAGE_ALIGN(size), 0x0,
|
PAGE_SIZE, 0, fix, "rk-dma-heap-cma",
|
&rk_dma_heap_cma);
|
if (ret)
|
return ret;
|
|
#if !IS_ENABLED(CONFIG_CMA_INACTIVE)
|
/* Architecture specific contiguous memory fixup. */
|
dma_contiguous_early_fixup(cma_get_base(rk_dma_heap_cma),
|
cma_get_size(rk_dma_heap_cma));
|
#endif
|
|
return 0;
|
}
|
|
struct cma *rk_dma_heap_get_cma(void)
|
{
|
return rk_dma_heap_cma;
|
}
|
