mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 00:24:12 +08:00
3ad7b4e8f8
if of_find_device_by_node() succeed, socfpga_setup_ocram_self_refresh
doesn't have a corresponding put_device(). Thus add a jump target to
fix the exception handling for this function implementation.
Fixes: 44fd8c7d40 ("ARM: socfpga: support suspend to ram")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* arch/arm/mach-socfpga/pm.c
|
|
*
|
|
* Copyright (C) 2014-2015 Altera Corporation. All rights reserved.
|
|
*
|
|
* with code from pm-imx6.c
|
|
* Copyright 2011-2014 Freescale Semiconductor, Inc.
|
|
* Copyright 2011 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/genalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/suspend.h>
|
|
#include <asm/suspend.h>
|
|
#include <asm/fncpy.h>
|
|
#include "core.h"
|
|
|
|
/* Pointer to function copied to ocram */
|
|
static u32 (*socfpga_sdram_self_refresh_in_ocram)(u32 sdr_base);
|
|
|
|
static int socfpga_setup_ocram_self_refresh(void)
|
|
{
|
|
struct platform_device *pdev;
|
|
phys_addr_t ocram_pbase;
|
|
struct device_node *np;
|
|
struct gen_pool *ocram_pool;
|
|
unsigned long ocram_base;
|
|
void __iomem *suspend_ocram_base;
|
|
int ret = 0;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "mmio-sram");
|
|
if (!np) {
|
|
pr_err("%s: Unable to find mmio-sram in dtb\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
pdev = of_find_device_by_node(np);
|
|
if (!pdev) {
|
|
pr_warn("%s: failed to find ocram device!\n", __func__);
|
|
ret = -ENODEV;
|
|
goto put_node;
|
|
}
|
|
|
|
ocram_pool = gen_pool_get(&pdev->dev, NULL);
|
|
if (!ocram_pool) {
|
|
pr_warn("%s: ocram pool unavailable!\n", __func__);
|
|
ret = -ENODEV;
|
|
goto put_device;
|
|
}
|
|
|
|
ocram_base = gen_pool_alloc(ocram_pool, socfpga_sdram_self_refresh_sz);
|
|
if (!ocram_base) {
|
|
pr_warn("%s: unable to alloc ocram!\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto put_device;
|
|
}
|
|
|
|
ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
|
|
|
|
suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
|
|
socfpga_sdram_self_refresh_sz,
|
|
false);
|
|
if (!suspend_ocram_base) {
|
|
pr_warn("%s: __arm_ioremap_exec failed!\n", __func__);
|
|
ret = -ENOMEM;
|
|
goto put_device;
|
|
}
|
|
|
|
/* Copy the code that puts DDR in self refresh to ocram */
|
|
socfpga_sdram_self_refresh_in_ocram =
|
|
(void *)fncpy(suspend_ocram_base,
|
|
&socfpga_sdram_self_refresh,
|
|
socfpga_sdram_self_refresh_sz);
|
|
|
|
WARN(!socfpga_sdram_self_refresh_in_ocram,
|
|
"could not copy function to ocram");
|
|
if (!socfpga_sdram_self_refresh_in_ocram)
|
|
ret = -EFAULT;
|
|
|
|
put_device:
|
|
put_device(&pdev->dev);
|
|
put_node:
|
|
of_node_put(np);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int socfpga_pm_suspend(unsigned long arg)
|
|
{
|
|
u32 ret;
|
|
|
|
if (!sdr_ctl_base_addr)
|
|
return -EFAULT;
|
|
|
|
ret = socfpga_sdram_self_refresh_in_ocram((u32)sdr_ctl_base_addr);
|
|
|
|
pr_debug("%s self-refresh loops request=%d exit=%d\n", __func__,
|
|
ret & 0xffff, (ret >> 16) & 0xffff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_pm_enter(suspend_state_t state)
|
|
{
|
|
switch (state) {
|
|
case PM_SUSPEND_MEM:
|
|
outer_disable();
|
|
cpu_suspend(0, socfpga_pm_suspend);
|
|
outer_resume();
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_suspend_ops socfpga_pm_ops = {
|
|
.valid = suspend_valid_only_mem,
|
|
.enter = socfpga_pm_enter,
|
|
};
|
|
|
|
static int __init socfpga_pm_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = socfpga_setup_ocram_self_refresh();
|
|
if (ret)
|
|
return ret;
|
|
|
|
suspend_set_ops(&socfpga_pm_ops);
|
|
pr_info("SoCFPGA initialized for DDR self-refresh during suspend.\n");
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(socfpga_pm_init);
|