From: 黄涛 <huangtao@rock-chips.com>
Date: Tue, 18 Sep 2012 09:21:47 +0000 (+0800)
Subject: rk: sram: add default sram_printch implementation
X-Git-Tag: firefly_0821_release~8607
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bde7cce9ea576114e07152d77ae25f3df5a72c60;p=firefly-linux-kernel-4.4.55.git

rk: sram: add default sram_printch implementation
---

diff --git a/arch/arm/plat-rk/sram.c b/arch/arm/plat-rk/sram.c
index 0edbf2f82c63..ec667094aa54 100644
--- a/arch/arm/plat-rk/sram.c
+++ b/arch/arm/plat-rk/sram.c
@@ -69,6 +69,21 @@ int __init rk29_sram_init(void)
 	return 0;
 }
 
+__weak void __sramfunc sram_printch(char byte)
+{
+#ifdef DEBUG_UART_BASE
+	writel_relaxed(byte, DEBUG_UART_BASE);
+	dsb();
+
+	/* loop check LSR[6], Transmitter Empty bit */
+	while (!(readl_relaxed(DEBUG_UART_BASE + 0x14) & 0x40))
+		barrier();
+
+	if (byte == '\n')
+		sram_printch('\r');
+#endif
+}
+
 void __sramfunc sram_printascii(const char *s)
 {
 	while (*s) {