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ARM: k2g: Configure reset mux to device reset

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BOOTCFG_RSTMUX8 register controls the reset mux associated with the ARM.
Timer5(dedicated to ARM) when used as WatchDog timer, the events it
generates are routed to the above mux.

Following are the 3 events that can controlled bt the reset mux:
- Device Reset
- An interrupt to the ARM_GIC
- An interrupt to the ARM_GIC followed by a device reset.

Right now to give a default watchdog behaviour "Device reset" is
being selected.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Lokesh Vutla 2016-05-26 19:05:44 +05:30 committed by Tom Rini
parent eafd4644c0
commit e2924e5904
2 changed files with 28 additions and 0 deletions
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12
arch/arm/mach-keystone/include/mach/hardware-k2g.h
View file

@ -74,4 +74,16 @@
#define K2G_GPIO_DIR_OFFSET 0x0
#define K2G_GPIO_SETDATA_OFFSET 0x8
/* BOOTCFG RESETMUX8 */
#define KS2_RSTMUX8 (KS2_DEVICE_STATE_CTRL_BASE + 0x328)
/* RESETMUX register definitions */
#define RSTMUX_LOCK8_SHIFT 0x0
#define RSTMUX_LOCK8_MASK (0x1 << 0)
#define RSTMUX_OMODE8_SHIFT 0x1
#define RSTMUX_OMODE8_MASK (0x7 << 1)
#define RSTMUX_OMODE8_DEV_RESET 0x2
#define RSTMUX_OMODE8_INT 0x3
#define RSTMUX_OMODE8_INT_AND_DEV_RESET 0x4
#endif /* __ASM_ARCH_HARDWARE_K2G_H */

16
board/ti/ks2_evm/board_k2g.c
View file

@ -117,12 +117,28 @@ int board_mmc_init(bd_t *bis)
#endif
#ifdef CONFIG_BOARD_EARLY_INIT_F
static void k2g_reset_mux_config(void)
{
/* Unlock the reset mux register */
clrbits_le32(KS2_RSTMUX8, RSTMUX_LOCK8_MASK);
/* Configure BOOTCFG_RSTMUX8 for WDT event to cause a device reset */
clrsetbits_le32(KS2_RSTMUX8, RSTMUX_OMODE8_MASK,
RSTMUX_OMODE8_DEV_RESET << RSTMUX_OMODE8_SHIFT);
/* lock the reset mux register to prevent any spurious writes. */
setbits_le32(KS2_RSTMUX8, RSTMUX_LOCK8_MASK);
}
int board_early_init_f(void)
{
init_plls();
k2g_mux_config();
k2g_reset_mux_config();
/* deassert FLASH_HOLD */
clrbits_le32(K2G_GPIO1_BANK2_BASE + K2G_GPIO_DIR_OFFSET,
BIT(9));