rockchip: add common tpl board file

Rockchip SoCs have similar boot process, prefer to use TPL for DRAM
init and back to bootrom, and SPL as Trust ATF/U-Boot loader. TPL
common board is a basic TPL board init which can be shared for most
of SoCs to avoid copy-pase for different SoCs.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/Kconfig

@@ -223,6 +223,15 @@ config TPL_ROCKCHIP_BACK_TO_BROM
           SPL will return to the boot rom, which will then load the U-Boot
           binary to keep going on.
 
+config TPL_ROCKCHIP_COMMON_BOARD
+	bool ""
+	depends on TPL
+	help
+	  Rockchip SoCs have similar boot process, prefer to use TPL for DRAM
+	  init and back to bootrom, and SPL as Trust ATF/U-Boot loader. TPL
+	  common board is a basic TPL board init which can be shared for most
+	  of SoCs to avoid copy-pase for different SoCs.
+
 config ROCKCHIP_BOOT_MODE_REG
 	hex "Rockchip boot mode flag register address"
 	help

arch/arm/mach-rockchip/Makefile

@@ -8,6 +8,7 @@
 # the stack-pointer is valid before switching to the U-Boot stack).
 obj-spl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o
 obj-tpl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o
+obj-tpl-$(CONFIG_TPL_ROCKCHIP_COMMON_BOARD) += tpl.o
 
 obj-tpl-$(CONFIG_ROCKCHIP_RK3288) += rk3288-board-tpl.o
 obj-tpl-$(CONFIG_ROCKCHIP_RK3368) += rk3368-board-tpl.o

arch/arm/mach-rockchip/tpl.c

@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019 Rockchip Electronics Co., Ltd
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <dm.h>
+#include <ram.h>
+#include <spl.h>
+#include <version.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/bootrom.h>
+
+#define TIMER_LOAD_COUNT_L	0x00
+#define TIMER_LOAD_COUNT_H	0x04
+#define TIMER_CONTROL_REG	0x10
+#define TIMER_EN	0x1
+#define	TIMER_FMODE	BIT(0)
+#define	TIMER_RMODE	BIT(1)
+
+__weak void rockchip_stimer_init(void)
+{
+	/* If Timer already enabled, don't re-init it */
+	u32 reg = readl(CONFIG_ROCKCHIP_STIMER_BASE + TIMER_CONTROL_REG);
+
+	if (reg & TIMER_EN)
+		return;
+
+#ifndef CONFIG_ARM64
+	asm volatile("mcr p15, 0, %0, c14, c0, 0"
+		     : : "r"(COUNTER_FREQUENCY));
+#endif
+
+	writel(0, CONFIG_ROCKCHIP_STIMER_BASE + TIMER_CONTROL_REG);
+	writel(0xffffffff, CONFIG_ROCKCHIP_STIMER_BASE);
+	writel(0xffffffff, CONFIG_ROCKCHIP_STIMER_BASE + 4);
+	writel(TIMER_EN | TIMER_FMODE, CONFIG_ROCKCHIP_STIMER_BASE +
+	       TIMER_CONTROL_REG);
+}
+
+void board_init_f(ulong dummy)
+{
+	struct udevice *dev;
+	int ret;
+
+#ifdef CONFIG_DEBUG_UART
+	/*
+	 * Debug UART can be used from here if required:
+	 *
+	 * debug_uart_init();
+	 * printch('a');
+	 * printhex8(0x1234);
+	 * printascii("string");
+	 */
+	debug_uart_init();
+	printascii("\nU-Boot TPL " PLAIN_VERSION " (" U_BOOT_DATE " - " \
+				U_BOOT_TIME ")\n");
+#endif
+	ret = spl_early_init();
+	if (ret) {
+		debug("spl_early_init() failed: %d\n", ret);
+		hang();
+	}
+
+	/* Init secure timer */
+	rockchip_stimer_init();
+	/* Init ARM arch timer in arch/arm/cpu/ */
+	timer_init();
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		printf("DRAM init failed: %d\n", ret);
+		return;
+	}
+}
+
+void board_return_to_bootrom(void)
+{
+	back_to_bootrom(BROM_BOOT_NEXTSTAGE);
+}
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_BOOTROM;
+}