ARM: zynqmp: add support for Xilinx ZCU104 board

Add support for the Xilinx Zynq Ultrascale+ MPSoC architecture (ZynqMP)
and the Xilinx ZCU104 board.

Barebox is booted as BL33 in EL-1 and expects that a BL2 (i.e. the FSBL)
already took care of initializing the RAM. Also for debug_ll, the UART
is expected to be already setup correctly. Thus, you have to add the
Barebox binary to a boot image as described in "Chapter 11: Boot and
Configuration" of "Zynq Ultrascale+ Device Technical Reference Manual".

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

12 files changed, 143 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cdc22efdeb..c1f385b11b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -245,6 +245,19 @@ config ARCH_ZYNQ
 	bool "Xilinx Zynq-based boards"
 	select HAS_DEBUG_LL
 
+config ARCH_ZYNQMP
+	bool "Xilinx ZynqMP-based boards"
+	select CPU_V8
+	select HAS_DEBUG_LL
+	select HAVE_PBL_MULTI_IMAGES
+	select COMMON_CLK
+	select COMMON_CLK_OF_PROVIDER
+	select CLKDEV_LOOKUP
+	select OFDEVICE
+	select OFTREE
+	select RELOCATABLE
+	select SYS_SUPPORTS_64BIT_KERNEL
+
 config ARCH_QEMU
 	bool "ARM QEMU boards"
 	select HAS_DEBUG_LL
@@ -275,6 +288,7 @@ source arch/arm/mach-tegra/Kconfig
 source arch/arm/mach-uemd/Kconfig
 source arch/arm/mach-zynq/Kconfig
 source arch/arm/mach-qemu/Kconfig
+source arch/arm/mach-zynqmp/Kconfig
 
 config ARM_ASM_UNIFIED
 	bool
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 50958b787f..675d3433cc 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -101,6 +101,7 @@ machine-$(CONFIG_ARCH_VEXPRESS)		:= vexpress
 machine-$(CONFIG_ARCH_TEGRA)		:= tegra
 machine-$(CONFIG_ARCH_UEMD)		:= uemd
 machine-$(CONFIG_ARCH_ZYNQ)		:= zynq
+machine-$(CONFIG_ARCH_ZYNQMP)		:= zynqmp
 machine-$(CONFIG_ARCH_QEMU)		:= qemu
 
 
diff --git a/arch/arm/boards/Makefile b/arch/arm/boards/Makefile
index 3bf176b14d..a15a24c02e 100644
--- a/arch/arm/boards/Makefile
+++ b/arch/arm/boards/Makefile
@@ -153,6 +153,7 @@ obj-$(CONFIG_MACH_VSCOM_BALTOS)			+= vscom-baltos/
 obj-$(CONFIG_MACH_QEMU_VIRT64)			+= qemu-virt64/
 obj-$(CONFIG_MACH_WARP7)			+= element14-warp7/
 obj-$(CONFIG_MACH_VF610_TWR)			+= freescale-vf610-twr/
+obj-$(CONFIG_MACH_XILINX_ZCU104)		+= xilinx-zcu104/
 obj-$(CONFIG_MACH_ZII_RDU1)			+= zii-imx51-rdu1/
 obj-$(CONFIG_MACH_ZII_RDU2)			+= zii-imx6q-rdu2/
 obj-$(CONFIG_MACH_ZII_VF610_DEV)		+= zii-vf610-dev/
diff --git a/arch/arm/boards/xilinx-zcu104/Makefile b/arch/arm/boards/xilinx-zcu104/Makefile
new file mode 100644
index 0000000000..884d6e63b0
--- /dev/null
+++ b/arch/arm/boards/xilinx-zcu104/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+lwl-y += lowlevel.o lowlevel_init.o
diff --git a/arch/arm/boards/xilinx-zcu104/lowlevel.c b/arch/arm/boards/xilinx-zcu104/lowlevel.c
new file mode 100644
index 0000000000..5541f9bc8e
--- /dev/null
+++ b/arch/arm/boards/xilinx-zcu104/lowlevel.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Pengutronix, Michael Tretter <m.tretter@pengutronix.de>
+ */
+
+#include <common.h>
+#include <debug_ll.h>
+#include <asm/barebox-arm.h>
+
+extern char __dtb_zynqmp_zcu104_revA_start[];
+
+void zynqmp_zcu104_start(uint32_t, uint32_t, uint32_t);
+
+void noinline zynqmp_zcu104_start(uint32_t r0, uint32_t r1, uint32_t r2)
+{
+	/* Assume that the first stage boot loader configured the UART */
+	putc_ll('>');
+
+	barebox_arm_entry(0, SZ_2G,
+			  __dtb_zynqmp_zcu104_revA_start + global_variable_offset());
+}
diff --git a/arch/arm/boards/xilinx-zcu104/lowlevel_init.S b/arch/arm/boards/xilinx-zcu104/lowlevel_init.S
new file mode 100644
index 0000000000..0482cf8caa
--- /dev/null
+++ b/arch/arm/boards/xilinx-zcu104/lowlevel_init.S
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include <linux/linkage.h>
+#include <asm/barebox-arm64.h>
+
+/* The DRAM is already setup */
+#define STACK_TOP 0x80000000
+
+ENTRY_PROC(start_zynqmp_zcu104)
+	mov x0, #STACK_TOP
+	mov sp, x0
+	b zynqmp_zcu104_start
+ENTRY_PROC_END(start_zynqmp_zcu104)
diff --git a/arch/arm/configs/zynqmp_defconfig b/arch/arm/configs/zynqmp_defconfig
new file mode 100644
index 0000000000..4dea9647fe
--- /dev/null
+++ b/arch/arm/configs/zynqmp_defconfig
@@ -0,0 +1,38 @@
+CONFIG_ARCH_ZYNQMP=y
+CONFIG_MACH_XILINX_ZCU104=y
+CONFIG_MMU=y
+CONFIG_MALLOC_SIZE=0x0
+CONFIG_MALLOC_TLSF=y
+CONFIG_KALLSYMS=y
+CONFIG_HUSH_FANCY_PROMPT=y
+CONFIG_CMDLINE_EDITING=y
+CONFIG_AUTO_COMPLETE=y
+CONFIG_MENU=y
+CONFIG_BOOTM_SHOW_TYPE=y
+CONFIG_BOOTM_VERBOSE=y
+CONFIG_BOOTM_INITRD=y
+CONFIG_BOOTM_OFTREE=y
+CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW=y
+CONFIG_LONGHELP=y
+CONFIG_CMD_MEMINFO=y
+CONFIG_CMD_GO=y
+CONFIG_CMD_RESET=y
+CONFIG_CMD_PARTITION=y
+CONFIG_CMD_EXPORT=y
+CONFIG_CMD_PRINTENV=y
+CONFIG_CMD_MAGICVAR=y
+CONFIG_CMD_MAGICVAR_HELP=y
+CONFIG_CMD_SAVEENV=y
+CONFIG_CMD_LN=y
+CONFIG_CMD_SLEEP=y
+CONFIG_CMD_EDIT=y
+CONFIG_CMD_MENU=y
+CONFIG_CMD_MENU_MANAGEMENT=y
+CONFIG_CMD_READLINE=y
+CONFIG_CMD_TIMEOUT=y
+CONFIG_CMD_CLK=y
+CONFIG_CMD_OFTREE=y
+CONFIG_CMD_TIME=y
+CONFIG_DRIVER_SERIAL_CADENCE=y
+# CONFIG_SPI is not set
+CONFIG_DIGEST=y
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index c08b35a101..8183b14898 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -120,6 +120,7 @@ pbl-dtb-$(CONFIG_MACH_ZII_VF610_DEV) += \
 pbl-dtb-$(CONFIG_MACH_AT91SAM9263EK_DT) += at91sam9263ek.dtb.o
 pbl-dtb-$(CONFIG_MACH_MICROCHIP_KSZ9477_EVB) += at91-microchip-ksz9477-evb.dtb.o
 pbl-dtb-$(CONFIG_MACH_AT91SAM9X5EK) += at91sam9x5ek.dtb.o
+pbl-dtb-$(CONFIG_MACH_XILINX_ZCU104) += zynqmp-zcu104-revA.dtb.o
 
 pbl-dtb-$(CONFIG_MACH_ZII_IMX7D_RPU2) += imx7d-zii-rpu2.dtb.o
 
diff --git a/arch/arm/dts/zynqmp-zcu104-revA.dts b/arch/arm/dts/zynqmp-zcu104-revA.dts
new file mode 100644
index 0000000000..8c467ee970
--- /dev/null
+++ b/arch/arm/dts/zynqmp-zcu104-revA.dts
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * dts file for Xilinx ZynqMP ZCU104
+ *
+ * (C) Copyright 2017 - 2018, Xilinx, Inc.
+ *
+ * Michal Simek <michal.simek@xilinx.com>
+ */
+
+#include <arm64/xilinx/zynqmp-zcu104-revA.dts>
diff --git a/arch/arm/mach-zynqmp/Kconfig b/arch/arm/mach-zynqmp/Kconfig
new file mode 100644
index 0000000000..c9dc71c9e7
--- /dev/null
+++ b/arch/arm/mach-zynqmp/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+if ARCH_ZYNQMP
+
+config MACH_XILINX_ZCU104
+	bool "Xilinx Zynq UltraScale+ MPSoC ZCU104"
+	help
+	  Say Y here if you are using the Xilinx Zynq UltraScale+ MPSoC ZCU104
+	  evaluation board.
+
+endif
diff --git a/arch/arm/mach-zynqmp/Makefile b/arch/arm/mach-zynqmp/Makefile
new file mode 100644
index 0000000000..c601374f6c
--- /dev/null
+++ b/arch/arm/mach-zynqmp/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+obj- := __dummy__.o
diff --git a/arch/arm/mach-zynqmp/include/mach/debug_ll.h b/arch/arm/mach-zynqmp/include/mach/debug_ll.h
new file mode 100644
index 0000000000..67571fe2e1
--- /dev/null
+++ b/arch/arm/mach-zynqmp/include/mach/debug_ll.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __MACH_DEBUG_LL_H__
+#define __MACH_DEBUG_LL_H__
+
+#include <io.h>
+
+#define ZYNQMP_UART0_BASE		0xFF000000
+#define ZYNQMP_UART1_BASE		0xFF010000
+#define ZYNQMP_UART_BASE		ZYNQMP_UART0_BASE
+#define ZYNQMP_DEBUG_LL_UART_BASE	ZYNQMP_UART_BASE
+
+#define ZYNQMP_UART_RXTXFIFO	0x30
+#define ZYNQMP_UART_CHANNEL_STS	0x2C
+
+#define ZYNQMP_UART_STS_TFUL	(1 << 4)
+#define ZYNQMP_UART_TXDIS		(1 << 5)
+
+static inline void PUTC_LL(int c)
+{
+	void __iomem *base = (void __iomem *)ZYNQMP_DEBUG_LL_UART_BASE;
+
+	if (readl(base) & ZYNQMP_UART_TXDIS)
+		return;
+
+	while ((readl(base + ZYNQMP_UART_CHANNEL_STS) & ZYNQMP_UART_STS_TFUL) != 0)
+		;
+
+	writel(c, base + 0x30);
+}
+
+#endif