[U-Boot] [PATCH] Added watchdog support for davinchi_dm365evm

* [U-Boot] [PATCH] Added watchdog support for davinchi_dm365evm
@ 2012-05-20 16:50 Stijn Souffriau
  2012-05-20 18:59 ` Mike Frysinger
  2012-05-21  6:17 ` Heiko Schocher
  0 siblings, 2 replies; 6+ messages in thread
From: Stijn Souffriau @ 2012-05-20 16:50 UTC (permalink / raw)
  To: u-boot

---
 board/davinci/dm365evm/dm365evm.c  |   68 ++++++++++++++++++++++++++++++++++++
 include/configs/davinci_dm365evm.h |   11 ++++++
 2 files changed, 79 insertions(+), 0 deletions(-)

diff --git a/board/davinci/dm365evm/dm365evm.c b/board/davinci/dm365evm/dm365evm.c
index ac54106..fb05019 100644
--- a/board/davinci/dm365evm/dm365evm.c
+++ b/board/davinci/dm365evm/dm365evm.c
@@ -150,3 +150,71 @@ int board_mmc_init(bd_t *bis)
 	return err;
 }
 #endif
+
+#ifdef CONFIG_HW_WATCHDOG
+static struct davinci_timer * const wdttimer =
+        (struct davinci_timer *)CONFIG_SYS_WDTTIMERBASE;
+
+/* WDTCR bit definitions */
+#define WDEN                    (1 << 14)
+#define WDFLAG                  (1 << 15)
+#define WDKEY_SEQ0              (0xa5c6 << 16)
+#define WDKEY_SEQ1              (0xda7e << 16)
+
+/* TCR bit definitions */
+#define ENAMODE12_DISABLED      (0 << 6)
+#define ENAMODE12_ONESHOT       (1 << 6)
+#define ENAMODE12_PERIODIC      (2 << 6)
+
+/* TGCR bit definitions */
+#define TIM12RS_UNRESET         (1 << 0)
+#define TIM34RS_UNRESET         (1 << 1)
+#define TIMMODE_64BIT_WDOG      (2 << 2)
+
+static void _hw_watchdog_enable(void)
+{
+        u32 timer_margin;
+        ulong wdt_freq;
+
+	/* disable, internal clock source */
+        writel(0x0, &wdttimer->tcr);
+	/* reset timer, set mode to 64-bit watchdog, and unreset */
+        writel(0x0, &wdttimer->tgcr);
+        writel(TIMMODE_64BIT_WDOG | TIM12RS_UNRESET | TIM34RS_UNRESET, &wdttimer->tgcr);
+	/* clear counter regs */
+        writel(0x0, &wdttimer->tim12);
+        writel(0x0, &wdttimer->tim34);
+
+	/* set timeout period */
+        wdt_freq = CONFIG_SYS_HZ_CLOCK;
+        printf("Setting watchdog period to %llu ticks == %is * %luHz\n",((u64)CONFIG_SYS_WDT_PERIOD_SECONDS * wdt_freq), CONFIG_SYS_WDT_PERIOD_SECONDS, wdt_freq);
+        timer_margin = (((u64)CONFIG_SYS_WDT_PERIOD_SECONDS * wdt_freq) & 0xffffffff);
+        writel(timer_margin, &wdttimer->prd12);
+        timer_margin = (((u64)CONFIG_SYS_WDT_PERIOD_SECONDS * wdt_freq) >> 32);
+        writel(timer_margin, &wdttimer->prd34);
+
+	/* enable run continuously */
+        writel(ENAMODE12_PERIODIC, &wdttimer->tcr);
+
+        /* put watchdog in pre-active state */
+        writel(WDKEY_SEQ0 | WDEN, &wdttimer->wdtcr);
+        /* put watchdog in active state */
+        writel(WDKEY_SEQ1 | WDEN, &wdttimer->wdtcr);
+}
+
+void hw_watchdog_reset(void)
+{
+        writel(WDKEY_SEQ0, &wdttimer->wdtcr);
+        writel(WDKEY_SEQ1, &wdttimer->wdtcr);
+}
+
+#endif
+
+int misc_init_r(void)
+{
+#ifdef CONFIG_HW_WATCHDOG
+        _hw_watchdog_enable();
+#endif
+        return 0;
+}
+
diff --git a/include/configs/davinci_dm365evm.h b/include/configs/davinci_dm365evm.h
index a75bce6..04173b9 100644
--- a/include/configs/davinci_dm365evm.h
+++ b/include/configs/davinci_dm365evm.h
@@ -245,4 +245,15 @@
 #define CONFIG_SYS_INIT_SP_ADDR		\
 	(CONFIG_SYS_SDRAM_BASE + 0x1000 - GENERATED_GBL_DATA_SIZE)
 
+#define CONFIG_MISC_INIT_R
+
+// Hardware watchdog config
+#ifdef CONFIG_HW_WATCHDOG
+#define CONFIG_SYS_WDTTIMERBASE		0x01C21C00 
+#define CONFIG_SYS_WDT_PERIOD_SECONDS	60
+// These two are insignificant but required to build arch/arm/cpu/arm926ejs/davinci/timer.c
+#define CONFIG_SYS_WDT_PERIOD_LOW	0
+#define CONFIG_SYS_WDT_PERIOD_HIGH	0
+#endif
+
 #endif /* __CONFIG_H */
-- 
1.7.0.4

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