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From: Alexander Shiyan <eagle.alexander923@gmail.com>
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Cc: Alexander Shiyan <eagle.alexander923@gmail.com>
Date: Tue, 19 Apr 2022 10:21:22 +0300
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autolearn=unavailable autolearn_force=no version=3.4.2
Subject: [PATCH 2/3] ARM: CCMX51: Add support for low-level debug
X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000)
X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de)
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
---
arch/arm/boards/ccxmx51/lowlevel.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/arch/arm/boards/ccxmx51/lowlevel.c b/arch/arm/boards/ccxmx51/lowlevel.c
index adcb30a7ff..367925e398 100644
--- a/arch/arm/boards/ccxmx51/lowlevel.c
+++ b/arch/arm/boards/ccxmx51/lowlevel.c
@@ -2,12 +2,37 @@
/* Author: Alexander Shiyan <shc_work@mail.ru> */
#include <common.h>
+#include <debug_ll.h>
+#include <mach/clock-imx51_53.h>
#include <mach/esdctl.h>
#include <mach/generic.h>
+#include <mach/iomux-mx51.h>
#include <asm/barebox-arm.h>
#include <asm/barebox-arm-head.h>
#include <mach/imx51-regs.h>
+static inline void setup_uart(void)
+{
+ void __iomem *iomuxbase = IOMEM(MX51_IOMUXC_BASE_ADDR);
+ void __iomem *ccmbase = IOMEM(MX51_CCM_BASE_ADDR);
+
+ /*
+ * Restore CCM values that might be changed by the Mask ROM
+ * code.
+ *
+ * Source: RealView debug scripts provided by Freescale
+ */
+ writel(MX5_CCM_CBCDR_RESET_VALUE, ccmbase + MX5_CCM_CBCDR);
+ writel(MX5_CCM_CSCMR1_RESET_VALUE, ccmbase + MX5_CCM_CSCMR1);
+ writel(MX5_CCM_CSCDR1_RESET_VALUE, ccmbase + MX5_CCM_CSCDR1);
+
+ imx_setup_pad(iomuxbase, MX51_PAD_UART1_TXD__UART1_TXD);
+
+ imx51_uart_setup_ll();
+
+ putc_ll('>');
+}
+
ENTRY_FUNCTION(start_ccxmx51, r0, r1, r2)
{
extern char __dtb_imx51_ccxmx51_start[];
@@ -15,6 +40,9 @@ ENTRY_FUNCTION(start_ccxmx51, r0, r1, r2)
imx5_cpu_lowlevel_init();
+ if (IS_ENABLED(CONFIG_DEBUG_LL))
+ setup_uart();
+
arm_setup_stack(0x20000000);
fdt = __dtb_imx51_ccxmx51_start + get_runtime_offset();
--
2.32.0
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