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 <clsee@altera.com>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Heiko Schocher <hs@denx.de>
Cc: Tom Rini <trini@ti.com>

diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 06ced10c356816e5715cac0fed7ed31da162013f..0276a10564c1fe63ec0c854803af9d3eafbc9bc2 100644 (file)
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -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

diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
new file mode 100644 (file)
index 0000000..e788e1b
--- /dev/null
+++ b/drivers/watchdog/designware_wdt.c
@@ -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)
+{
+       /* reset to disable the watchdog */
+       hw_watchdog_reset();
+       /* set timer in miliseconds */
+       designware_wdt_settimeout(CONFIG_HW_WATCHDOG_TIMEOUT_MS);
+       /* enable the watchdog */
+       designware_wdt_enable();
+       /* reset the watchdog */
+       hw_watchdog_reset();
+}
+#endif