[U-Boot] [PATCH v1 12/12] sparc: leon3: Add debug_uart support to LEON3 serial driver.

[Francois Retief]

Signed-off-by: Francois Retief <fgretief at spaceteq.co.za>
---

 arch/sparc/cpu/leon3/cpu_init.c |  5 ++++-
 arch/sparc/cpu/leon3/serial.c   | 27 ++++++++++++++++++++++++++-
 configs/grsim_defconfig         |  4 ++++
 drivers/serial/Kconfig          |  8 ++++++++
 4 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c
index 40d1751..b140da3 100644
--- a/arch/sparc/cpu/leon3/cpu_init.c
+++ b/arch/sparc/cpu/leon3/cpu_init.c
@@ -13,6 +13,7 @@
 #include <ambapp.h>
 #include <grlib/irqmp.h>
 #include <grlib/gptimer.h>
+#include <debug_uart.h>

 #include <config.h>

@@ -50,7 +51,9 @@ struct {
  */
 void cpu_init_f(void)
 {
-
+#ifdef CONFIG_DEBUG_UART
+       debug_uart_init();
+#endif
 }

 /* Routine called from start.S,
diff --git a/arch/sparc/cpu/leon3/serial.c b/arch/sparc/cpu/leon3/serial.c
index cefb9d2..66b3773 100644
--- a/arch/sparc/cpu/leon3/serial.c
+++ b/arch/sparc/cpu/leon3/serial.c
@@ -28,8 +28,10 @@ static int leon3_serial_init(void)

        /* find UART */
        if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_APBUART,
-               CONFIG_SYS_GRLIB_APBUART_INDEX, &apbdev) != 1)
+               CONFIG_SYS_GRLIB_APBUART_INDEX, &apbdev) != 1) {
+               panic("%s: apbuart not found!\n", __func__);
                return -1; /* didn't find hardware */
+       }

        /* found apbuart, let's init .. */
        uart = (ambapp_dev_apbuart *) apbdev.address;
@@ -145,3 +147,26 @@ __weak struct serial_device *default_serial_console(void)
 {
        return &leon3_serial_drv;
 }
+
+#ifdef CONFIG_DEBUG_UART_APBUART
+
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+       ambapp_dev_apbuart *uart = (ambapp_dev_apbuart *)CONFIG_DEBUG_UART_BASE;
+       uart->scaler = (((CONFIG_DEBUG_UART_CLOCK*10) / (CONFIG_BAUDRATE*8)) - 5)/10;
+       uart->ctrl = APBUART_CTRL_RE | APBUART_CTRL_TE;
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+       ambapp_dev_apbuart *uart = (ambapp_dev_apbuart *)CONFIG_DEBUG_UART_BASE;
+       while (!(readl(&uart->status) & APBUART_STATUS_THE))
+               WATCHDOG_RESET();
+       writel(ch, &uart->data);
+}
+
+DEBUG_UART_FUNCS
+
+#endif
diff --git a/configs/grsim_defconfig b/configs/grsim_defconfig
index a5ea7ab..d2f709f 100644
--- a/configs/grsim_defconfig
+++ b/configs/grsim_defconfig
@@ -14,3 +14,7 @@ CONFIG_SYS_TEXT_BASE=0x00000000
 # CONFIG_CMD_NET is not set
 # CONFIG_CMD_NFS is not set
 CONFIG_SYS_AMBAPP_PRINT_ON_STARTUP=y
+CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_APBUART=y
+CONFIG_DEBUG_UART_BASE=0x80000100
+CONFIG_DEBUG_UART_CLOCK=40000000
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 53b4e1b..79e92e8 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -91,6 +91,14 @@ config DEBUG_UART_S5P
          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_APBUART
+       depends on LEON3
+       bool "Gaisler APBUART"
+       help
+         Select this to enable a debug UART using the serial_leon3 driver. You
+         will need to provide parameters to make this work. The driver will
+         be available until the real driver model serial is running.
+
 endchoice

 config DEBUG_UART_BASE
--
2.4.3


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