From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH] ARM: nitrogen6: add lowlevel UART initialization
Date: Thu, 2 Jan 2020 11:23:35 +0100 [thread overview]
Message-ID: <20200102102334.73726-1-r.czerwinski@pengutronix.de> (raw)
Mux UART1 and UART2 correctly to allow usage of DEBUG_LL.
This commit has only been tested on nitrogen6q.
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
.../boundarydevices-nitrogen6/lowlevel.c | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/arm/boards/boundarydevices-nitrogen6/lowlevel.c b/arch/arm/boards/boundarydevices-nitrogen6/lowlevel.c
index 74ff71fc24..47c231396d 100644
--- a/arch/arm/boards/boundarydevices-nitrogen6/lowlevel.c
+++ b/arch/arm/boards/boundarydevices-nitrogen6/lowlevel.c
@@ -1,16 +1,40 @@
#include <common.h>
+#include <debug_ll.h>
#include <mach/generic.h>
#include <mach/esdctl.h>
#include <asm/barebox-arm.h>
+#include <serial/imx-uart.h>
extern char __dtb_imx6q_nitrogen6x_start[];
+static inline void setup_uart(void)
+{
+ void __iomem *iomuxbase = (void *)MX6_IOMUXC_BASE_ADDR;
+
+ //UART 1
+ writel(0x1, iomuxbase + 0x02a8);
+ writel(0x1, iomuxbase + 0x02ac);
+
+ //UART 2
+ writel(0x4, iomuxbase + 0x00bc);
+ writel(0x4, iomuxbase + 0x00c0);
+ writel(0x0, iomuxbase + 0x0928);
+
+ imx6_ungate_all_peripherals();
+ imx6_uart_setup((void *)MX6_UART2_BASE_ADDR);
+ pbl_set_putc(imx_uart_putc, (void *)MX6_UART2_BASE_ADDR);
+}
+
+
ENTRY_FUNCTION(start_imx6q_nitrogen6x_1g, r0, r1, r2)
{
void *fdt;
imx6_cpu_lowlevel_init();
+ if (IS_ENABLED(CONFIG_DEBUG_LL))
+ setup_uart();
+
fdt = __dtb_imx6q_nitrogen6x_start + get_runtime_offset();
imx6q_barebox_entry(fdt);
--
2.24.1
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next reply other threads:[~2020-01-02 10:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-02 10:23 Rouven Czerwinski [this message]
2020-01-02 10:41 ` Ahmad Fatoum
2020-01-06 9:46 ` Lucas Stach
2020-01-06 10:09 ` Rouven Czerwinski
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