Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / watchdog / tnetv107x_wdt.c

diff --git a/qemu/roms/u-boot/drivers/watchdog/tnetv107x_wdt.c b/qemu/roms/u-boot/drivers/watchdog/tnetv107x_wdt.c
new file mode 100644 (file)
index 0000000..3d3f366
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/watchdog/tnetv107x_wdt.c
@@ -0,0 +1,165 @@
+/*
+ * TNETV107X: Watchdog timer implementation (for reset)
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+
+#define MAX_DIV                0xFFFE0001
+
+struct wdt_regs {
+       u32 kick_lock;
+#define KICK_LOCK_1    0x5555
+#define KICK_LOCK_2    0xaaaa
+       u32 kick;
+
+       u32 change_lock;
+#define CHANGE_LOCK_1  0x6666
+#define CHANGE_LOCK_2  0xbbbb
+       u32 change;
+
+       u32 disable_lock;
+#define DISABLE_LOCK_1 0x7777
+#define DISABLE_LOCK_2 0xcccc
+#define DISABLE_LOCK_3 0xdddd
+       u32 disable;
+
+       u32 prescale_lock;
+#define PRESCALE_LOCK_1        0x5a5a
+#define PRESCALE_LOCK_2        0xa5a5
+       u32 prescale;
+};
+
+static struct wdt_regs* regs = (struct wdt_regs *)TNETV107X_WDT0_ARM_BASE;
+
+#define wdt_reg_read(reg)      __raw_readl(&regs->reg)
+#define wdt_reg_write(reg, val)        __raw_writel((val), &regs->reg)
+
+static int write_prescale_reg(unsigned long prescale_value)
+{
+       wdt_reg_write(prescale_lock, PRESCALE_LOCK_1);
+       if ((wdt_reg_read(prescale_lock) & 0x3) != 0x1)
+               return -1;
+
+       wdt_reg_write(prescale_lock, PRESCALE_LOCK_2);
+       if ((wdt_reg_read(prescale_lock) & 0x3) != 0x3)
+               return -1;
+
+       wdt_reg_write(prescale, prescale_value);
+
+       return 0;
+}
+
+static int write_change_reg(unsigned long initial_timer_value)
+{
+       wdt_reg_write(change_lock, CHANGE_LOCK_1);
+       if ((wdt_reg_read(change_lock) & 0x3) != 0x1)
+               return -1;
+
+       wdt_reg_write(change_lock, CHANGE_LOCK_2);
+       if ((wdt_reg_read(change_lock) & 0x3) != 0x3)
+               return -1;
+
+       wdt_reg_write(change, initial_timer_value);
+
+       return 0;
+}
+
+static int wdt_control(unsigned long disable_value)
+{
+       wdt_reg_write(disable_lock, DISABLE_LOCK_1);
+       if ((wdt_reg_read(disable_lock) & 0x3) != 0x1)
+               return -1;
+
+       wdt_reg_write(disable_lock, DISABLE_LOCK_2);
+       if ((wdt_reg_read(disable_lock) & 0x3) != 0x2)
+               return -1;
+
+       wdt_reg_write(disable_lock, DISABLE_LOCK_3);
+       if ((wdt_reg_read(disable_lock) & 0x3) != 0x3)
+               return -1;
+
+       wdt_reg_write(disable, disable_value);
+       return 0;
+}
+
+static int wdt_set_period(unsigned long msec)
+{
+       unsigned long change_value, count_value;
+       unsigned long prescale_value = 1;
+       unsigned long refclk_khz, maxdiv;
+       int ret;
+
+       refclk_khz = clk_get_rate(TNETV107X_LPSC_WDT_ARM);
+       maxdiv = (MAX_DIV / refclk_khz);
+
+       if ((!msec) || (msec > maxdiv))
+               return -1;
+
+       count_value = refclk_khz * msec;
+       if (count_value > 0xffff) {
+               change_value = count_value / 0xffff + 1;
+               prescale_value = count_value / change_value;
+       } else {
+               change_value = count_value;
+       }
+
+       ret = write_prescale_reg(prescale_value - 1);
+       if (ret)
+               return ret;
+
+       ret = write_change_reg(change_value);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+unsigned long last_wdt = -1;
+
+int wdt_start(unsigned long msecs)
+{
+       int ret;
+       ret = wdt_control(0);
+       if (ret)
+               return ret;
+       ret = wdt_set_period(msecs);
+       if (ret)
+               return ret;
+       ret = wdt_control(1);
+       if (ret)
+               return ret;
+       ret = wdt_kick();
+       last_wdt = msecs;
+       return ret;
+}
+
+int wdt_stop(void)
+{
+       last_wdt = -1;
+       return wdt_control(0);
+}
+
+int wdt_kick(void)
+{
+       wdt_reg_write(kick_lock, KICK_LOCK_1);
+       if ((wdt_reg_read(kick_lock) & 0x3) != 0x1)
+               return -1;
+
+       wdt_reg_write(kick_lock, KICK_LOCK_2);
+       if ((wdt_reg_read(kick_lock) & 0x3) != 0x3)
+               return -1;
+
+       wdt_reg_write(kick, 1);
+       return 0;
+}
+
+void reset_cpu(ulong addr)
+{
+       clk_enable(TNETV107X_LPSC_WDT_ARM);
+       wdt_start(1);
+       wdt_kick();
+}