[U-Boot] [PATCH 2/2] ARM: UniPhier: add UART initialization routine for low-level debug
Masahiro Yamada
yamada.m at jp.panasonic.com
Fri Nov 7 13:08:53 CET 2014
The low-level debugging functions are very useful to debug the early
boot stage where the full UART driver is not available.
UniPhier SoCs need to initialize the UART port 0 to use this feature.
The initialization routine is called the very entry of the
lowlevel_init().
Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
---
arch/arm/cpu/armv7/uniphier/lowlevel_init.S | 4 +++
arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile | 1 +
.../cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S | 29 ++++++++++++++++
arch/arm/cpu/armv7/uniphier/ph1-pro4/Makefile | 1 +
.../cpu/armv7/uniphier/ph1-pro4/lowlevel_debug.S | 39 ++++++++++++++++++++++
arch/arm/cpu/armv7/uniphier/ph1-sld8/Makefile | 1 +
.../cpu/armv7/uniphier/ph1-sld8/lowlevel_debug.S | 29 ++++++++++++++++
arch/arm/include/asm/arch-uniphier/debug-uart.S | 24 +++++++++++++
8 files changed, 128 insertions(+)
create mode 100644 arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S
create mode 100644 arch/arm/cpu/armv7/uniphier/ph1-pro4/lowlevel_debug.S
create mode 100644 arch/arm/cpu/armv7/uniphier/ph1-sld8/lowlevel_debug.S
create mode 100644 arch/arm/include/asm/arch-uniphier/debug-uart.S
diff --git a/arch/arm/cpu/armv7/uniphier/lowlevel_init.S b/arch/arm/cpu/armv7/uniphier/lowlevel_init.S
index 0ea12d3..c208ab6 100644
--- a/arch/arm/cpu/armv7/uniphier/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/uniphier/lowlevel_init.S
@@ -26,6 +26,10 @@ ENTRY(lowlevel_init)
orr r0, r0, #(CR_C | CR_M) @ enable MMU and Dcache
mcr p15, 0, r0, c1, c0, 0
+#ifdef CONFIG_DEBUG_LL
+ bl setup_lowlevel_debug
+#endif
+
/*
* Now we are using the page table embedded in the Boot ROM.
* It is not handy since it is not a straight mapped table for sLD3.
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile b/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile
index 781b511..040f49d 100644
--- a/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile
+++ b/arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_DISPLAY_BOARDINFO) += board_info.o
obj-y += platdevice.o
obj-y += boot-mode.o
+obj-$(CONFIG_DEBUG_LL) += lowlevel_debug.o
obj-$(CONFIG_BOARD_POSTCLK_INIT) += board_postclk_init.o bcu_init.o \
sbc_init.o sg_init.o pll_init.o clkrst_init.o pinctrl.o
obj-$(CONFIG_SPL_BUILD) += pll_spectrum.o \
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S b/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S
new file mode 100644
index 0000000..c0778a0
--- /dev/null
+++ b/arch/arm/cpu/armv7/uniphier/ph1-ld4/lowlevel_debug.S
@@ -0,0 +1,29 @@
+/*
+ * On-chip UART initializaion for low-level debugging
+ *
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m at jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+#include <asm/arch/sg-regs.h>
+
+#define UART_CLK 36864000
+#include <asm/arch/debug-uart.S>
+
+ENTRY(setup_lowlevel_debug)
+ init_debug_uart r0, r1, r2
+
+ /* UART Port 0 */
+ set_pinsel 85, 1, r0, r1
+ set_pinsel 88, 1, r0, r1
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ mov pc, lr
+ENDPROC(setup_lowlevel_debug)
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-pro4/Makefile b/arch/arm/cpu/armv7/uniphier/ph1-pro4/Makefile
index e11f4f6..6f657c0 100644
--- a/arch/arm/cpu/armv7/uniphier/ph1-pro4/Makefile
+++ b/arch/arm/cpu/armv7/uniphier/ph1-pro4/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_DISPLAY_BOARDINFO) += board_info.o
obj-y += platdevice.o
obj-y += boot-mode.o
+obj-$(CONFIG_DEBUG_LL) += lowlevel_debug.o
obj-$(CONFIG_BOARD_POSTCLK_INIT) += board_postclk_init.o sbc_init.o \
sg_init.o pll_init.o clkrst_init.o pinctrl.o
obj-$(CONFIG_SPL_BUILD) += pll_spectrum.o \
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-pro4/lowlevel_debug.S b/arch/arm/cpu/armv7/uniphier/ph1-pro4/lowlevel_debug.S
new file mode 100644
index 0000000..a793b7c
--- /dev/null
+++ b/arch/arm/cpu/armv7/uniphier/ph1-pro4/lowlevel_debug.S
@@ -0,0 +1,39 @@
+/*
+ * On-chip UART initializaion for low-level debugging
+ *
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m at jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+#include <asm/arch/sc-regs.h>
+#include <asm/arch/sg-regs.h>
+
+#define UART_CLK 73728000
+#include <asm/arch/debug-uart.S>
+
+ENTRY(setup_lowlevel_debug)
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CLK_PERI
+ str r1, [r0]
+
+ init_debug_uart r0, r1, r2
+
+ /* UART Port 0 */
+ set_pinsel 127, 0, r0, r1
+ set_pinsel 128, 0, r0, r1
+
+ ldr r0, =SG_LOADPINCTRL
+ mov r1, #1
+ str r1, [r0]
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ mov pc, lr
+ENDPROC(setup_lowlevel_debug)
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-sld8/Makefile b/arch/arm/cpu/armv7/uniphier/ph1-sld8/Makefile
index 781b511..040f49d 100644
--- a/arch/arm/cpu/armv7/uniphier/ph1-sld8/Makefile
+++ b/arch/arm/cpu/armv7/uniphier/ph1-sld8/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_DISPLAY_BOARDINFO) += board_info.o
obj-y += platdevice.o
obj-y += boot-mode.o
+obj-$(CONFIG_DEBUG_LL) += lowlevel_debug.o
obj-$(CONFIG_BOARD_POSTCLK_INIT) += board_postclk_init.o bcu_init.o \
sbc_init.o sg_init.o pll_init.o clkrst_init.o pinctrl.o
obj-$(CONFIG_SPL_BUILD) += pll_spectrum.o \
diff --git a/arch/arm/cpu/armv7/uniphier/ph1-sld8/lowlevel_debug.S b/arch/arm/cpu/armv7/uniphier/ph1-sld8/lowlevel_debug.S
new file mode 100644
index 0000000..a413e5f
--- /dev/null
+++ b/arch/arm/cpu/armv7/uniphier/ph1-sld8/lowlevel_debug.S
@@ -0,0 +1,29 @@
+/*
+ * On-chip UART initializaion for low-level debugging
+ *
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m at jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+#include <asm/arch/sg-regs.h>
+
+#define UART_CLK 80000000
+#include <asm/arch/debug-uart.S>
+
+ENTRY(setup_lowlevel_debug)
+ init_debug_uart r0, r1, r2
+
+ /* UART Port 0 */
+ set_pinsel 70, 3, r0, r1
+ set_pinsel 71, 3, r0, r1
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ mov pc, lr
+ENDPROC(setup_lowlevel_debug)
diff --git a/arch/arm/include/asm/arch-uniphier/debug-uart.S b/arch/arm/include/asm/arch-uniphier/debug-uart.S
new file mode 100644
index 0000000..af55fee
--- /dev/null
+++ b/arch/arm/include/asm/arch-uniphier/debug-uart.S
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m at jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/serial_reg.h>
+
+#if !defined(CONFIG_DEBUG_SEMIHOSTING)
+#include CONFIG_DEBUG_LL_INCLUDE
+#endif
+
+#define BAUDRATE 115200
+#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d))
+#define DIVISOR DIV_ROUND(UART_CLK, 16 * BAUDRATE)
+
+ .macro init_debug_uart, ra, rb, rc
+ addruart \ra, \rb, \rc
+ mov \rb, #UART_LCR_WLEN8
+ strb \rb, [\ra, #0x11]
+ ldr \rb, =DIVISOR
+ str \rb, [\ra, #0x24]
+ .endm
--
1.9.1
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