Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / ath25 / early_printk.c

diff --git a/kernel/arch/mips/ath25/early_printk.c b/kernel/arch/mips/ath25/early_printk.c
new file mode 100644 (file)
index 0000000..36035b6
--- /dev/null
+++ b/kernel/arch/mips/ath25/early_printk.c
@@ -0,0 +1,44 @@
+/*
+ * 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) 2010 Gabor Juhos <juhosg@openwrt.org>
+ */
+
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#include "devices.h"
+#include "ar2315_regs.h"
+#include "ar5312_regs.h"
+
+static inline void prom_uart_wr(void __iomem *base, unsigned reg,
+                               unsigned char ch)
+{
+       __raw_writel(ch, base + 4 * reg);
+}
+
+static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
+{
+       return __raw_readl(base + 4 * reg);
+}
+
+void prom_putchar(unsigned char ch)
+{
+       static void __iomem *base;
+
+       if (unlikely(base == NULL)) {
+               if (is_ar2315())
+                       base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
+               else
+                       base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
+       }
+
+       while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+               ;
+       prom_uart_wr(base, UART_TX, ch);
+       while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+               ;
+}