ARM: uniphier: support Debug UART
For ARM32 architecture, CONFIG_DEBUG_LL is available for early
low-level debugging (and actually UniPhier 32bit SoCs use it), but
ARM64 architecture does not support it. Instead, CONFIG_DEBUG_UART
is available as an architecture-independent debug facility.
This commit supports it on all the UniPhier SoCs (including the new
ARMv8 SoCs), which is very useful for new SoC bringups.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Makefile b/arch/arm/mach-uniphier/Makefile
index 1a8c649..35edca1 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile
@@ -28,5 +28,6 @@
obj-y += dram/
obj-$(CONFIG_MICRO_SUPPORT_CARD) += micro-support-card.o
+obj-$(CONFIG_DEBUG_UART_UNIPHIER) += debug-uart/
obj-$(CONFIG_CPU_V7) += arm32/
diff --git a/arch/arm/mach-uniphier/debug-uart/Makefile b/arch/arm/mach-uniphier/debug-uart/Makefile
new file mode 100644
index 0000000..0bad718
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/Makefile
@@ -0,0 +1,17 @@
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_ARCH_UNIPHIER_SLD3) += debug-uart-sld3.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD4) += debug-uart-ld4.o
+obj-$(CONFIG_ARCH_UNIPHIER_PRO4) += debug-uart-pro4.o
+obj-$(CONFIG_ARCH_UNIPHIER_SLD8) += debug-uart-sld8.o
+obj-$(CONFIG_ARCH_UNIPHIER_PRO5) += debug-uart-pro5.o
+obj-$(CONFIG_ARCH_UNIPHIER_PXS2) += debug-uart-pxs2.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD6B) += debug-uart-ld6b.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD11) += debug-uart-ld20.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD20) += debug-uart-ld20.o
+endif
+
+obj-y += debug-uart.o
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-ld20.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld20.c
new file mode 100644
index 0000000..2dc2bf8
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld20.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../sc64-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_LD20_UART_CLK 58820000
+
+unsigned int uniphier_ld20_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_iectrl(54); /* TXD0 */
+ sg_set_iectrl(58); /* TXD1 */
+ sg_set_iectrl(90); /* TXD2 */
+ sg_set_iectrl(94); /* TXD3 */
+ sg_set_pinsel(54, 0, 8, 4); /* TXD0 -> TXD0 */
+ sg_set_pinsel(58, 1, 8, 4); /* SPITXD1 -> TXD1 */
+ sg_set_pinsel(90, 1, 8, 4); /* PC0WE -> TXD2 */
+ sg_set_pinsel(94, 1, 8, 4); /* PCD00 -> TXD3 */
+
+ tmp = readl(SC_CLKCTRL4);
+ tmp |= SC_CLKCTRL4_PERI;
+ writel(tmp, SC_CLKCTRL4);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_LD20_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-ld4.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld4.c
new file mode 100644
index 0000000..d5f1234
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld4.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_LD4_UART_CLK 36864000
+
+unsigned int uniphier_ld4_debug_uart_init(void)
+{
+ sg_set_iectrl(0);
+ sg_set_pinsel(88, 1, 8, 4); /* HSDOUT6 -> TXD0 */
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_LD4_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-ld6b.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld6b.c
new file mode 100644
index 0000000..50879f5
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-ld6b.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_LD6B_UART_CLK 88888888
+
+unsigned int uniphier_ld6b_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_iectrl(0);
+ sg_set_pinsel(135, 3, 8, 4); /* PORT10 -> TXD0 */
+ sg_set_pinsel(115, 0, 8, 4); /* TXD1 -> TXD1 */
+ sg_set_pinsel(113, 2, 8, 4); /* SBO0 -> TXD2 */
+
+ tmp = readl(SC_CLKCTRL);
+ tmp |= SC_CLKCTRL_CEN_PERI;
+ writel(tmp, SC_CLKCTRL);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_LD6B_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
new file mode 100644
index 0000000..91998ec
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_PRO4_UART_CLK 73728000
+
+unsigned int uniphier_pro4_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_iectrl(0);
+ sg_set_pinsel(128, 0, 4, 8); /* TXD0 -> TXD0 */
+
+ writel(1, SG_LOADPINCTRL);
+
+ tmp = readl(SC_CLKCTRL);
+ tmp |= SC_CLKCTRL_CEN_PERI;
+ writel(tmp, SC_CLKCTRL);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_PRO4_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-pro5.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro5.c
new file mode 100644
index 0000000..5390396
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro5.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_PRO5_UART_CLK 73728000
+
+unsigned int uniphier_pro5_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_iectrl(0);
+ sg_set_pinsel(47, 0, 4, 8); /* TXD0 -> TXD0 */
+ sg_set_pinsel(49, 0, 4, 8); /* TXD1 -> TXD1 */
+ sg_set_pinsel(51, 0, 4, 8); /* TXD2 -> TXD2 */
+ sg_set_pinsel(53, 0, 4, 8); /* TXD3 -> TXD3 */
+
+ writel(1, SG_LOADPINCTRL);
+
+ tmp = readl(SC_CLKCTRL);
+ tmp |= SC_CLKCTRL_CEN_PERI;
+ writel(tmp, SC_CLKCTRL);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_PRO5_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-pxs2.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-pxs2.c
new file mode 100644
index 0000000..22a200a
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-pxs2.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_PXS2_UART_CLK 88888888
+
+unsigned int uniphier_pxs2_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_iectrl(0);
+ sg_set_pinsel(217, 8, 8, 4); /* TXD0 -> TXD0 */
+ sg_set_pinsel(115, 8, 8, 4); /* TXD1 -> TXD1 */
+ sg_set_pinsel(113, 8, 8, 4); /* TXD2 -> TXD2 */
+ sg_set_pinsel(219, 8, 8, 4); /* TXD3 -> TXD3 */
+
+ tmp = readl(SC_CLKCTRL);
+ tmp |= SC_CLKCTRL_CEN_PERI;
+ writel(tmp, SC_CLKCTRL);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_PXS2_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-sld3.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld3.c
new file mode 100644
index 0000000..508318a
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld3.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include "../bcu/bcu-regs.h"
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_SLD3_UART_CLK 36864000
+
+unsigned int uniphier_sld3_debug_uart_init(void)
+{
+ u32 tmp;
+
+ sg_set_pinsel(64, 1, 4, 4); /* TXD0 -> TXD0 */
+
+ writel(0x24440000, BCSCR5);
+
+ tmp = readl(SC_CLKCTRL);
+ tmp |= SC_CLKCTRL_CEN_PERI;
+ writel(tmp, SC_CLKCTRL);
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_SLD3_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c
new file mode 100644
index 0000000..68d390c
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-sld8.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/kernel.h>
+
+#include "../sg-regs.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_SLD8_UART_CLK 80000000
+
+unsigned int uniphier_sld8_debug_uart_init(void)
+{
+ sg_set_iectrl(0);
+ sg_set_pinsel(70, 3, 8, 4); /* HSDOUT6 -> TXD0 */
+
+ return DIV_ROUND_CLOSEST(UNIPHIER_SLD8_UART_CLK, 16 * CONFIG_BAUDRATE);
+}
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart.c b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
new file mode 100644
index 0000000..d884785
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#include "../soc-info.h"
+#include "debug-uart.h"
+
+#define UNIPHIER_UART_TX 0x00
+#define UNIPHIER_UART_LCR_MCR 0x10
+#define UNIPHIER_UART_LSR 0x14
+#define UNIPHIER_UART_LDR 0x24
+
+static void _debug_uart_putc(int c)
+{
+ void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
+
+ while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE))
+ ;
+
+ writel(c, base + UNIPHIER_UART_TX);
+}
+
+void _debug_uart_init(void)
+{
+ void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
+ unsigned int divisor;
+
+ switch (uniphier_get_soc_type()) {
+#if defined(CONFIG_ARCH_UNIPHIER_SLD3)
+ case SOC_UNIPHIER_SLD3:
+ divisor = uniphier_sld3_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_LD4)
+ case SOC_UNIPHIER_LD4:
+ divisor = uniphier_ld4_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PRO4)
+ case SOC_UNIPHIER_PRO4:
+ divisor = uniphier_pro4_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_SLD8)
+ case SOC_UNIPHIER_SLD8:
+ divisor = uniphier_sld8_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PRO5)
+ case SOC_UNIPHIER_PRO5:
+ divisor = uniphier_pro5_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PXS2)
+ case SOC_UNIPHIER_PXS2:
+ divisor = uniphier_pxs2_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_LD6B)
+ case SOC_UNIPHIER_LD6B:
+ divisor = uniphier_ld6b_debug_uart_init();
+ break;
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_LD11) || defined(CONFIG_ARCH_UNIPHIER_LD20)
+ case SOC_UNIPHIER_LD11:
+ case SOC_UNIPHIER_LD20:
+ divisor = uniphier_ld20_debug_uart_init();
+ break;
+#endif
+ default:
+ return;
+ }
+
+ writel(UART_LCR_WLEN8 << 8, base + UNIPHIER_UART_LCR_MCR);
+
+ writel(divisor, base + UNIPHIER_UART_LDR);
+}
+DEBUG_UART_FUNCS
diff --git a/arch/arm/mach-uniphier/debug-uart/debug-uart.h b/arch/arm/mach-uniphier/debug-uart/debug-uart.h
new file mode 100644
index 0000000..8de9124
--- /dev/null
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _MACH_DEBUG_UART_H
+#define _MACH_DEBUG_UART_H
+
+unsigned int uniphier_sld3_debug_uart_init(void);
+unsigned int uniphier_ld4_debug_uart_init(void);
+unsigned int uniphier_pro4_debug_uart_init(void);
+unsigned int uniphier_sld8_debug_uart_init(void);
+unsigned int uniphier_pro5_debug_uart_init(void);
+unsigned int uniphier_pxs2_debug_uart_init(void);
+unsigned int uniphier_ld6b_debug_uart_init(void);
+unsigned int uniphier_ld11_debug_uart_init(void);
+unsigned int uniphier_ld20_debug_uart_init(void);
+
+#endif /* _MACH_DEBUG_UART_H */
diff --git a/arch/arm/mach-uniphier/init/init.c b/arch/arm/mach-uniphier/init/init.c
index d5d1018..7316d51 100644
--- a/arch/arm/mach-uniphier/init/init.c
+++ b/arch/arm/mach-uniphier/init/init.c
@@ -5,6 +5,7 @@
*/
#include <common.h>
+#include <debug_uart.h>
#include <spl.h>
#include "../init.h"
@@ -14,6 +15,10 @@
{
const struct uniphier_board_data *param;
+#ifdef CONFIG_DEBUG_UART
+ debug_uart_init();
+#endif
+
param = uniphier_get_board_param();
if (!param)
hang();