watchdog/denali: Adding DesignWare watchdog driver support

To add the DesignWare watchdog driver support. It required information such as register base address and clock info from configuration header file within include/configs folder.

Signed-off-by Chin Liang See <[email protected]>

Cc Anatolij Gustschin <[email protected]>

Cc Albert Aribaud <[email protected]>

Cc Heiko Schocher <[email protected]>

Cc Tom Rini <[email protected]>

---
Changes for v5
- Updated to latest code branch
Changes for v4
- Added static for local function
Changes for v3
- Split to 2 series patch
Changes for v2
- Enable this driver at socfpga_cyclone5 board

---
 drivers/watchdog/Makefile         |    1 +
 drivers/watchdog/designware_wdt.c |   74 +++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 drivers/watchdog/designware_wdt.c

drivers/watchdog/Makefile +1 -0

index 06ced10..0276a10 100644
@@ -15,3 +15,4 @@ obj-$(CONFIG_S5P)               += s5p_wdt.o
 obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
 obj-$(CONFIG_BFIN_WATCHDOG)  += bfin_wdt.o
 obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
+obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o

drivers/watchdog/designware_wdt.c new file +64 -0

new file mode 100644
index 0000000..e788e1b
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2013 Altera Corporation <www.altera.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/io.h>
+#include <asm/utils.h>
+
+#define DW_WDT_CR	0x00
+#define DW_WDT_TORR	0x04
+#define DW_WDT_CRR	0x0C
+
+#define DW_WDT_CR_EN_OFFSET	0x00
+#define DW_WDT_CR_RMOD_OFFSET	0x01
+#define DW_WDT_CR_RMOD_VAL	0x00
+#define DW_WDT_CRR_RESTART_VAL	0x76
+
+/*
+ * Set the watchdog time interval.
+ * Counter is 32 bit.
+ */
+static int designware_wdt_settimeout(unsigned int timeout)
+{
+	signed int i;
+
+	/* calculate the timeout range value */
+	i = (log_2_n_round_up(timeout * CONFIG_DW_WDT_CLOCK_KHZ)) - 16;
+	if (i > 15)
+		i = 15;
+	if (i < 0)
+		i = 0;
+
+	writel((i | (i << 4)), (CONFIG_DW_WDT_BASE + DW_WDT_TORR));
+	return 0;
+}
+
+static void designware_wdt_enable(void)
+{
+	writel(((DW_WDT_CR_RMOD_VAL << DW_WDT_CR_RMOD_OFFSET) |
+	      (0x1 << DW_WDT_CR_EN_OFFSET)),
+	      (CONFIG_DW_WDT_BASE + DW_WDT_CR));
+}
+
+static unsigned int designware_wdt_is_enabled(void)
+{
+	unsigned long val;
+	val = readl((CONFIG_DW_WDT_BASE + DW_WDT_CR));
+	return val & 0x1;
+}
+
+#if defined(CONFIG_HW_WATCHDOG)
+void hw_watchdog_reset(void)
+{
+	if (designware_wdt_is_enabled())
+		/* restart the watchdog counter */
+		writel(DW_WDT_CRR_RESTART_VAL,
+		       (CONFIG_DW_WDT_BASE + DW_WDT_CRR));
+}
+
+void hw_watchdog_init(void)
+{