am335x: Enable RTC 32K OSC clock
In order to support low power state, you must source kernel system
timers to persistent clock, available across suspend/resume. In case of
AM335x device, the only source we have is, RTC32K, available in
wakeup/always-on domain. Having said that, during validation it has
been observed that, RTC clock need couple of seconds delay to stabilize
the RTC OSC clock; and such a huge delay is not acceptable in kernel
especially during early init and also it will impact quick/fast boot
use-cases.
So, RTC32k OSC enable dependency has been shifted to
SPL/first-bootloader.
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index 6cfbef7..819fd2f 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -169,6 +169,12 @@
unsigned int clktimer2clk; /* offset 0x08 */
};
+/* Control Module RTC registers */
+struct cm_rtc {
+ unsigned int rtcclkctrl; /* offset 0x0 */
+ unsigned int clkstctrl; /* offset 0x4 */
+};
+
/* Watchdog timer registers */
struct wd_timer {
unsigned int resv1[4];
@@ -218,6 +224,15 @@
unsigned int tcar2; /* offset 0x58 */
};
+/* RTC Registers */
+struct rtc_regs {
+ unsigned int res[21];
+ unsigned int osc; /* offset 0x54 */
+ unsigned int res2[5];
+ unsigned int kick0r; /* offset 0x6c */
+ unsigned int kick1r; /* offset 0x70 */
+};
+
/* UART Registers */
struct uart_sys {
unsigned int resv1[21];
diff --git a/arch/arm/include/asm/arch-am33xx/hardware.h b/arch/arm/include/asm/arch-am33xx/hardware.h
index 62332f2..5bd4bc8 100644
--- a/arch/arm/include/asm/arch-am33xx/hardware.h
+++ b/arch/arm/include/asm/arch-am33xx/hardware.h
@@ -61,6 +61,7 @@
#define CM_WKUP 0x44E00400
#define CM_DPLL 0x44E00500
#define CM_DEVICE 0x44E00700
+#define CM_RTC 0x44E00800
#define CM_CEFUSE 0x44E00A00
#define PRM_DEVICE 0x44E00F00
@@ -83,4 +84,7 @@
#define AM335X_CPSW_BASE 0x4A100000
#define AM335X_CPSW_MDIO_BASE 0x4A101000
+/* RTC base address */
+#define AM335X_RTC_BASE 0x44E3E000
+
#endif /* __AM33XX_HARDWARE_H */