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authorSergey Ryazanov <ryazanov.s.a@gmail.com>2014-10-29 02:18:42 +0300
committerRalf Baechle <ralf@linux-mips.org>2014-11-24 09:45:27 +0300
commit8aaa7278c0c98a77ec36e1fed7d9bede58164a26 (patch)
treef4a1aa46b46f55d627d1d30f4a9e1f990f922a9a /arch/mips/ath25
parent1753e74ed8fa3235174d5baa3421cbf8d693a42d (diff)
downloadlinux-8aaa7278c0c98a77ec36e1fed7d9bede58164a26.tar.xz
MIPS: ath25: add early printk support
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com> Cc: Linux MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/8241/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/ath25')
-rw-r--r--arch/mips/ath25/Makefile2
-rw-r--r--arch/mips/ath25/early_printk.c44
2 files changed, 46 insertions, 0 deletions
diff --git a/arch/mips/ath25/Makefile b/arch/mips/ath25/Makefile
index 201b7d412902..eabad7da446a 100644
--- a/arch/mips/ath25/Makefile
+++ b/arch/mips/ath25/Makefile
@@ -10,5 +10,7 @@
obj-y += board.o prom.o devices.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
obj-$(CONFIG_SOC_AR5312) += ar5312.o
obj-$(CONFIG_SOC_AR2315) += ar2315.o
diff --git a/arch/mips/ath25/early_printk.c b/arch/mips/ath25/early_printk.c
new file mode 100644
index 000000000000..36035b628161
--- /dev/null
+++ b/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)
+ ;
+}