Update from 2013.01 to 2013.07

[karo-tx-uboot.git] / drivers / watchdog / xilinx_tb_wdt.c

diff --git a/drivers/watchdog/xilinx_tb_wdt.c b/drivers/watchdog/xilinx_tb_wdt.c
new file mode 100644 (file)
index 0000000..4e46e4c
--- /dev/null
+++ b/drivers/watchdog/xilinx_tb_wdt.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2011-2013 Xilinx Inc.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/microblaze_intc.h>
+#include <asm/processor.h>
+#include <watchdog.h>
+
+#define XWT_CSR0_WRS_MASK      0x00000008 /* Reset status Mask */
+#define XWT_CSR0_WDS_MASK      0x00000004 /* Timer state Mask */
+#define XWT_CSR0_EWDT1_MASK    0x00000002 /* Enable bit 1 Mask*/
+#define XWT_CSRX_EWDT2_MASK    0x00000001 /* Enable bit 2 Mask */
+
+struct watchdog_regs {
+       u32 twcsr0; /* 0x0 */
+       u32 twcsr1; /* 0x4 */
+       u32 tbr; /* 0x8 */
+};
+
+static struct watchdog_regs *watchdog_base =
+                       (struct watchdog_regs *)CONFIG_WATCHDOG_BASEADDR;
+
+void hw_watchdog_reset(void)
+{
+       u32 reg;
+
+       /* Read the current contents of TCSR0 */
+       reg = readl(&watchdog_base->twcsr0);
+
+       /* Clear the watchdog WDS bit */
+       if (reg & (XWT_CSR0_EWDT1_MASK | XWT_CSRX_EWDT2_MASK))
+               writel(reg | XWT_CSR0_WDS_MASK, &watchdog_base->twcsr0);
+}
+
+void hw_watchdog_disable(void)
+{
+       u32 reg;
+
+       /* Read the current contents of TCSR0 */
+       reg = readl(&watchdog_base->twcsr0);
+
+       writel(reg & ~XWT_CSR0_EWDT1_MASK, &watchdog_base->twcsr0);
+       writel(~XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
+
+       puts("Watchdog disabled!\n");
+}
+
+static void hw_watchdog_isr(void *arg)
+{
+       hw_watchdog_reset();
+}
+
+int hw_watchdog_init(void)
+{
+       int ret;
+
+       writel((XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK | XWT_CSR0_EWDT1_MASK),
+              &watchdog_base->twcsr0);
+       writel(XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
+
+       ret = install_interrupt_handler(CONFIG_WATCHDOG_IRQ,
+                                               hw_watchdog_isr, NULL);
+       if (ret)
+               return 1;
+
+       return 0;
+}