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authorAlexey Brodkin <abrodkin@synopsys.com>2018-05-21 16:42:07 +0300
committerAlexey Brodkin <abrodkin@synopsys.com>2018-05-24 15:59:17 +0300
commit54705016ba705601acd32e04ff4e28b82f7ce71a (patch)
tree26cdaecd5d444bbaac2c2417f65a9b25538e3ba1
parentd7ac185fd840d1406fcafc1b412482138475af82 (diff)
serial/serial_arc: Implement debug serial
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
-rw-r--r--drivers/serial/Kconfig9
-rw-r--r--drivers/serial/serial_arc.c26
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 1aab0320f67..87779098608 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -197,6 +197,15 @@ config DEBUG_UART_AR933X
driver will be available until the real driver model serial is
running.
+config DEBUG_ARC_SERIAL
+ bool "ARC UART"
+ depends on ARC_SERIAL
+ help
+ Select this to enable a debug UART using the ARC UART driver.
+ You will need to provide parameters to make this work. The
+ driver will be available until the real driver model serial is
+ running.
+
config DEBUG_UART_ATMEL
bool "Atmel USART"
help
diff --git a/drivers/serial/serial_arc.c b/drivers/serial/serial_arc.c
index da4a07ab2f6..925f0c25554 100644
--- a/drivers/serial/serial_arc.c
+++ b/drivers/serial/serial_arc.c
@@ -130,3 +130,29 @@ U_BOOT_DRIVER(serial_arc) = {
.ops = &arc_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
+
+#ifdef CONFIG_DEBUG_ARC_SERIAL
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+ struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+ int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1;
+
+ writeb(arc_console_baud & 0xff, &regs->baudl);
+ writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+}
+
+static inline void _debug_uart_putc(int c)
+{
+ struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+
+ while (!(readb(&regs->status) & UART_TXEMPTY))
+ ;
+
+ writeb(c, &regs->data);
+}
+
+DEBUG_UART_FUNCS
+
+#endif