mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-30 00:20:44 +09:00
1eb0a464b7
This driver supports ast2500 and ast2400 SoCs. Only ast2500 supports reset_mask and thus the option of resettting individual peripherals using WDT. Signed-off-by: Maxim Sloyko <maxims@google.com> Reviewed-by: Simon Glass <sjg@chromium.org>
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/*
|
|
* (C) Copyright 2016 Google, Inc
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/wdt.h>
|
|
#include <linux/err.h>
|
|
|
|
u32 ast_reset_mode_from_flags(ulong flags)
|
|
{
|
|
return flags & WDT_CTRL_RESET_MASK;
|
|
}
|
|
|
|
u32 ast_reset_mask_from_flags(ulong flags)
|
|
{
|
|
return flags >> 2;
|
|
}
|
|
|
|
ulong ast_flags_from_reset_mode_mask(u32 reset_mode, u32 reset_mask)
|
|
{
|
|
ulong ret = reset_mode & WDT_CTRL_RESET_MASK;
|
|
|
|
if (ret == WDT_CTRL_RESET_SOC)
|
|
ret |= (reset_mask << 2);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifndef CONFIG_WDT
|
|
void wdt_stop(struct ast_wdt *wdt)
|
|
{
|
|
clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
|
|
}
|
|
|
|
void wdt_start(struct ast_wdt *wdt, u32 timeout)
|
|
{
|
|
writel(timeout, &wdt->counter_reload_val);
|
|
writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
|
|
/*
|
|
* Setting CLK1MHZ bit is just for compatibility with ast2400 part.
|
|
* On ast2500 watchdog timer clock is fixed at 1MHz and the bit is
|
|
* read-only
|
|
*/
|
|
setbits_le32(&wdt->ctrl,
|
|
WDT_CTRL_EN | WDT_CTRL_RESET | WDT_CTRL_CLK1MHZ);
|
|
}
|
|
#endif /* CONFIG_WDT */
|
|
|
|
int ast_wdt_reset_masked(struct ast_wdt *wdt, u32 mask)
|
|
{
|
|
#ifdef CONFIG_ASPEED_AST2500
|
|
if (!mask)
|
|
return -EINVAL;
|
|
|
|
writel(mask, &wdt->reset_mask);
|
|
clrbits_le32(&wdt->ctrl,
|
|
WDT_CTRL_RESET_MASK << WDT_CTRL_RESET_MODE_SHIFT);
|
|
wdt_start(wdt, 1);
|
|
|
|
/* Wait for WDT to reset */
|
|
while (readl(&wdt->ctrl) & WDT_CTRL_EN)
|
|
;
|
|
wdt_stop(wdt);
|
|
|
|
return 0;
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
|
|
struct ast_wdt *ast_get_wdt(u8 wdt_number)
|
|
{
|
|
if (wdt_number > CONFIG_WDT_NUM - 1)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return (struct ast_wdt *)(WDT_BASE +
|
|
sizeof(struct ast_wdt) * wdt_number);
|
|
}
|