MIPS: JZ4740: reset: Initialize hibernate wakeup counters.

In hibernation mode only the wakeup logic and the RTC are left running,
so this is what users perceive as power down.

If the counters are not initialized, the corresponding pin (typically
connected to the power button) has to be asserted for two seconds
before the device wakes up. Most users expect a shorter wakeup time.

I took the timing values of 100 ms and 60 ms from BouKiCHi's patch for
the Dingoo A320 kernel.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3563/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 44 insertions, 5 deletions

diff --git a/arch/mips/jz4740/reset.c b/arch/mips/jz4740/reset.c
index 5f1fb95c0d0d..6c0da5afcf17 100644
--- a/arch/mips/jz4740/reset.c
+++ b/arch/mips/jz4740/reset.c
@@ -21,6 +21,9 @@
 #include <asm/mach-jz4740/base.h>
 #include <asm/mach-jz4740/timer.h>
 
+#include "reset.h"
+#include "clock.h"
+
 static void jz4740_halt(void)
 {
         while (1) {
@@ -53,21 +56,57 @@ static void jz4740_restart(char *command)
         jz4740_halt();
 }
 
-#define JZ_REG_RTC_CTRL         0x00
-#define JZ_REG_RTC_HIBERNATE    0x20
+#define JZ_REG_RTC_CTRL                 0x00
+#define JZ_REG_RTC_HIBERNATE            0x20
+#define JZ_REG_RTC_WAKEUP_FILTER        0x24
+#define JZ_REG_RTC_RESET_COUNTER        0x28
 
-#define JZ_RTC_CTRL_WRDY        BIT(7)
+#define JZ_RTC_CTRL_WRDY                BIT(7)
+#define JZ_RTC_WAKEUP_FILTER_MASK       0x0000FFE0
+#define JZ_RTC_RESET_COUNTER_MASK       0x00000FE0
 
-static void jz4740_power_off(void)
+static inline void jz4740_rtc_wait_ready(void __iomem *rtc_base)
 {
-        void __iomem *rtc_base = ioremap(JZ4740_RTC_BASE_ADDR, 0x24);
         uint32_t ctrl;
 
         do {
                 ctrl = readl(rtc_base + JZ_REG_RTC_CTRL);
         } while (!(ctrl & JZ_RTC_CTRL_WRDY));
+}
 
+static void jz4740_power_off(void)
+{
+        void __iomem *rtc_base = ioremap(JZ4740_RTC_BASE_ADDR, 0x38);
+        unsigned long wakeup_filter_ticks;
+        unsigned long reset_counter_ticks;
+
+        /*
+         * Set minimum wakeup pin assertion time: 100 ms.
+         * Range is 0 to 2 sec if RTC is clocked at 32 kHz.
+         */
+        wakeup_filter_ticks = (100 * jz4740_clock_bdata.rtc_rate) / 1000;
+        if (wakeup_filter_ticks < JZ_RTC_WAKEUP_FILTER_MASK)
+                wakeup_filter_ticks &= JZ_RTC_WAKEUP_FILTER_MASK;
+        else
+                wakeup_filter_ticks = JZ_RTC_WAKEUP_FILTER_MASK;
+        jz4740_rtc_wait_ready(rtc_base);
+        writel(wakeup_filter_ticks, rtc_base + JZ_REG_RTC_WAKEUP_FILTER);
+
+        /*
+         * Set reset pin low-level assertion time after wakeup: 60 ms.
+         * Range is 0 to 125 ms if RTC is clocked at 32 kHz.
+         */
+        reset_counter_ticks = (60 * jz4740_clock_bdata.rtc_rate) / 1000;
+        if (reset_counter_ticks < JZ_RTC_RESET_COUNTER_MASK)
+                reset_counter_ticks &= JZ_RTC_RESET_COUNTER_MASK;
+        else
+                reset_counter_ticks = JZ_RTC_RESET_COUNTER_MASK;
+        jz4740_rtc_wait_ready(rtc_base);
+        writel(reset_counter_ticks, rtc_base + JZ_REG_RTC_RESET_COUNTER);
+
+        jz4740_rtc_wait_ready(rtc_base);
         writel(1, rtc_base + JZ_REG_RTC_HIBERNATE);
+
         jz4740_halt();
 }