80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2019 MediaTek Inc.
|
|
* Author: Sagy Shih <sagy.shih@mediatek.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <mt-plat/sync_write.h>
|
|
|
|
#include <dramc_io.h>
|
|
#include "mtk_dramc.h"
|
|
|
|
void __iomem *SLEEP_BASE_ADDR;
|
|
|
|
static DEFINE_SPINLOCK(dramc_lock);
|
|
int acquire_dram_ctrl(void)
|
|
{
|
|
unsigned int cnt;
|
|
unsigned long save_flags;
|
|
|
|
/* acquire SPM HW SEMAPHORE to avoid race condition */
|
|
spin_lock_irqsave(&dramc_lock, save_flags);
|
|
|
|
cnt = 2;
|
|
do {
|
|
if ((readl(PDEF_SPM_AP_SEMAPHORE) & 0x1) != 0x1) {
|
|
writel(0x1, PDEF_SPM_AP_SEMAPHORE);
|
|
if ((readl(PDEF_SPM_AP_SEMAPHORE) & 0x1) == 0x1)
|
|
break;
|
|
}
|
|
|
|
cnt--;
|
|
/* pr_info("[DRAMC] wait for SPM HW SEMAPHORE\n"); */
|
|
udelay(1);
|
|
} while (cnt > 0);
|
|
|
|
if (cnt == 0) {
|
|
spin_unlock_irqrestore(&dramc_lock, save_flags);
|
|
pr_info("[DRAMC] can NOT get SPM HW SEMAPHORE!\n");
|
|
return -1;
|
|
}
|
|
|
|
/* pr_info("[DRAMC] get SPM HW SEMAPHORE success!\n"); */
|
|
|
|
spin_unlock_irqrestore(&dramc_lock, save_flags);
|
|
return 0;
|
|
}
|
|
|
|
int release_dram_ctrl(void)
|
|
{
|
|
/* release SPM HW SEMAPHORE to avoid race condition */
|
|
if ((readl(PDEF_SPM_AP_SEMAPHORE) & 0x1) == 0x0) {
|
|
pr_err("[DRAMC] has NOT acquired SPM HW SEMAPHORE\n");
|
|
/* BUG(); */
|
|
}
|
|
|
|
writel(0x1, PDEF_SPM_AP_SEMAPHORE);
|
|
if ((readl(PDEF_SPM_AP_SEMAPHORE) & 0x1) == 0x1) {
|
|
pr_err("[DRAMC] release SPM HW SEMAPHORE fail!\n");
|
|
/* BUG(); */
|
|
}
|
|
/* pr_info("[DRAMC] release SPM HW SEMAPHORE success!\n"); */
|
|
return 0;
|
|
}
|
|
|