Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / bcm63xx / early_printk.c

diff --git a/kernel/arch/mips/bcm63xx/early_printk.c b/kernel/arch/mips/bcm63xx/early_printk.c
new file mode 100644 (file)
index 0000000..6092226
--- /dev/null
+++ b/kernel/arch/mips/bcm63xx/early_printk.c
@@ -0,0 +1,29 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ */
+
+#include <bcm63xx_io.h>
+#include <linux/serial_bcm63xx.h>
+
+static void wait_xfered(void)
+{
+       unsigned int val;
+
+       /* wait for any previous char to be transmitted */
+       do {
+               val = bcm_uart0_readl(UART_IR_REG);
+               if (val & UART_IR_STAT(UART_IR_TXEMPTY))
+                       break;
+       } while (1);
+}
+
+void prom_putchar(char c)
+{
+       wait_xfered();
+       bcm_uart0_writel(c, UART_FIFO_REG);
+       wait_xfered();
+}