mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 14:00:58 +07:00
5f90b9b484
The pool is created thru devm_gen_pool_create, so the call to gen_pool_destroy is not necessary. Instead the sram-clock must be turned off again if it exists. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Ulrich Prinz <ulrich.prinz@googlemail.com> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
|
|
* Generic on-chip SRAM allocation driver
|
|
*
|
|
* Copyright (C) 2012 Philipp Zabel, Pengutronix
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/genalloc.h>
|
|
|
|
#define SRAM_GRANULARITY 32
|
|
|
|
struct sram_dev {
|
|
struct gen_pool *pool;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static int sram_probe(struct platform_device *pdev)
|
|
{
|
|
void __iomem *virt_base;
|
|
struct sram_dev *sram;
|
|
struct resource *res;
|
|
unsigned long size;
|
|
int ret;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
virt_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(virt_base))
|
|
return PTR_ERR(virt_base);
|
|
|
|
size = resource_size(res);
|
|
|
|
sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
|
|
if (!sram)
|
|
return -ENOMEM;
|
|
|
|
sram->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(sram->clk))
|
|
sram->clk = NULL;
|
|
else
|
|
clk_prepare_enable(sram->clk);
|
|
|
|
sram->pool = devm_gen_pool_create(&pdev->dev, ilog2(SRAM_GRANULARITY), -1);
|
|
if (!sram->pool)
|
|
return -ENOMEM;
|
|
|
|
ret = gen_pool_add_virt(sram->pool, (unsigned long)virt_base,
|
|
res->start, size, -1);
|
|
if (ret < 0) {
|
|
if (sram->clk)
|
|
clk_disable_unprepare(sram->clk);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, sram);
|
|
|
|
dev_dbg(&pdev->dev, "SRAM pool: %ld KiB @ 0x%p\n", size / 1024, virt_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sram_remove(struct platform_device *pdev)
|
|
{
|
|
struct sram_dev *sram = platform_get_drvdata(pdev);
|
|
|
|
if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
|
|
dev_dbg(&pdev->dev, "removed while SRAM allocated\n");
|
|
|
|
gen_pool_destroy(sram->pool);
|
|
|
|
if (sram->clk)
|
|
clk_disable_unprepare(sram->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct of_device_id sram_dt_ids[] = {
|
|
{ .compatible = "mmio-sram" },
|
|
{}
|
|
};
|
|
#endif
|
|
|
|
static struct platform_driver sram_driver = {
|
|
.driver = {
|
|
.name = "sram",
|
|
.of_match_table = of_match_ptr(sram_dt_ids),
|
|
},
|
|
.probe = sram_probe,
|
|
.remove = sram_remove,
|
|
};
|
|
|
|
static int __init sram_init(void)
|
|
{
|
|
return platform_driver_register(&sram_driver);
|
|
}
|
|
|
|
postcore_initcall(sram_init);
|