From: Thierry Reding <tred...@nvidia.com>
Use the physical address of the debug serial port from the configuration
to provide an early_putc() implementation that can be used with the new
early console support.
Cc: Tom Warren <twar...@nvidia.com>
Signed-off-by: Thierry Reding <tred...@nvidia.com>
---
board/nvidia/common/board.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index c3d77893ded3..d945de456ea2 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -155,6 +155,28 @@ int board_init(void)
return 0;
}
+#ifdef CONFIG_EARLY_CONSOLE
+#define UART_THR 0x00
+#define UART_LSR 0x14
+
+void early_putc(char ch)
+{
+ uint32_t mask = UART_LSR_TEMT | UART_LSR_THRE, value;
+ unsigned long base = CONFIG_SYS_NS16550_COM1;
+
+ if (ch == '\n')
+ early_putc('\r');
+
+ writel(ch, base + UART_THR);
+
+ while (true) {
+ value = readl(base + UART_LSR);
+ if ((value & mask) == mask)
+ break;
+ }
+}
+#endif
+
#ifdef CONFIG_BOARD_EARLY_INIT_F
static void __gpio_early_init(void)
{
--
2.3.2
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