rockchip/rk3399: Add watchdog support in pmusram
To catch early hangs in resume, this sets up the watchdog before
anything else in the pmusram code (ignoring setting up the stack...).
This uses hard coded settings for the watchdog until the proper
watchdog restore later on in the firmware/kernel.
This also restores the old watchdog register values before the PLLs
are restored to make sure we don't temporarily switch over to a 1/3s
timeout on the watchdog when the pclk_wdt goes from 4MHz to 100MHz.
Change-Id: I8f7652089a88783271b17482117b4609330abe80
Signed-off-by: Derek Basehore <dbasehore@chromium.org>
diff --git a/plat/rockchip/rk3399/drivers/dram/suspend.c b/plat/rockchip/rk3399/drivers/dram/suspend.c
index 2a80bcb..dd97581 100644
--- a/plat/rockchip/rk3399/drivers/dram/suspend.c
+++ b/plat/rockchip/rk3399/drivers/dram/suspend.c
@@ -9,6 +9,8 @@
#include <dram.h>
#include <plat_private.h>
#include <platform_def.h>
+#include <pmu.h>
+#include <pmu_bits.h>
#include <pmu_regs.h>
#include <rk3399_def.h>
#include <secure.h>
@@ -656,6 +658,30 @@
;
}
+__pmusramfunc static void pmusram_enable_watchdog(void)
+{
+ /* Make the watchdog use the first global reset. */
+ mmio_write_32(CRU_BASE + CRU_GLB_RST_CON, 1 << 1);
+
+ /*
+ * This gives the system ~8 seconds before reset. The pclk for the
+ * watchdog is 4MHz on reset. The value of 0x9 in WDT_TORR means that
+ * the watchdog will wait for 0x1ffffff cycles before resetting.
+ */
+ mmio_write_32(WDT0_BASE + 4, 0x9);
+
+ /* Enable the watchdog */
+ mmio_setbits_32(WDT0_BASE, 0x1);
+
+ /* Magic reset the watchdog timer value for WDT_CRR. */
+ mmio_write_32(WDT0_BASE + 0xc, 0x76);
+
+ secure_watchdog_ungate();
+
+ /* The watchdog is in PD_ALIVE, so deidle it. */
+ mmio_clrbits_32(PMU_BASE + PMU_BUS_CLR, PMU_CLR_ALIVE);
+}
+
void dmc_suspend(void)
{
struct rk3399_sdram_params *sdram_params = &sdram_config;
@@ -726,6 +752,9 @@
uint32_t channel_mask = 0;
uint32_t channel;
+ pmusram_enable_watchdog();
+ pmu_sgrf_rst_hld_release();
+ restore_pmu_rsthold();
sram_secure_timer_init();
/*