https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 519d81956ee277b4419c723adfb154603c2565ba authored by Linus Torvalds on 18 October 2021, 06:00:13 UTC
Linux 5.15-rc6
Linux 5.15-rc6
Tip revision: 519d819
sram.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* mach-davinci/sram.c - DaVinci simple SRAM allocator
*
* Copyright (C) 2009 David Brownell
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/genalloc.h>
#include <mach/common.h>
#include "sram.h"
static struct gen_pool *sram_pool;
struct gen_pool *sram_get_gen_pool(void)
{
return sram_pool;
}
void *sram_alloc(size_t len, dma_addr_t *dma)
{
dma_addr_t dma_base = davinci_soc_info.sram_dma;
if (dma)
*dma = 0;
if (!sram_pool || (dma && !dma_base))
return NULL;
return gen_pool_dma_alloc(sram_pool, len, dma);
}
EXPORT_SYMBOL(sram_alloc);
void sram_free(void *addr, size_t len)
{
gen_pool_free(sram_pool, (unsigned long) addr, len);
}
EXPORT_SYMBOL(sram_free);
/*
* REVISIT This supports CPU and DMA access to/from SRAM, but it
* doesn't (yet?) support some other notable uses of SRAM: as TCM
* for data and/or instructions; and holding code needed to enter
* and exit suspend states (while DRAM can't be used).
*/
static int __init sram_init(void)
{
phys_addr_t phys = davinci_soc_info.sram_dma;
unsigned len = davinci_soc_info.sram_len;
int status = 0;
void __iomem *addr;
if (len) {
len = min_t(unsigned, len, SRAM_SIZE);
sram_pool = gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
if (!sram_pool)
status = -ENOMEM;
}
if (sram_pool) {
addr = ioremap(phys, len);
if (!addr)
return -ENOMEM;
status = gen_pool_add_virt(sram_pool, (unsigned long) addr,
phys, len, -1);
if (status < 0)
iounmap(addr);
}
WARN_ON(status < 0);
return status;
}
core_initcall(sram_init);