rockchip: rk3368: spl: add TPL support

This adds the TPL support for the RK3368, including the u-boot-tpl.lds.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-rockchip/Makefile

@@ -12,6 +12,7 @@ obj-spl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o save_boot_param.o
 obj-tpl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o save_boot_param.o
 
 obj-tpl-$(CONFIG_ROCKCHIP_RK3188) += rk3188-board-tpl.o
+obj-tpl-$(CONFIG_ROCKCHIP_RK3368) += rk3368-board-tpl.o
 
 obj-spl-$(CONFIG_ROCKCHIP_RK3036) += rk3036-board-spl.o
 obj-spl-$(CONFIG_ROCKCHIP_RK3188) += rk3188-board-spl.o

arch/arm/mach-rockchip/rk3368-board-tpl.c

@@ -0,0 +1,176 @@
+/*
+ * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/clock.h>
+#include <debug_uart.h>
+#include <dm.h>
+#include <ram.h>
+#include <spl.h>
+#include <asm/io.h>
+#include <asm/arch/bootrom.h>
+#include <asm/arch/cru_rk3368.h>
+#include <asm/arch/grf_rk3368.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/timer.h>
+#include <syscon.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * The ARMv8 generic timer uses the STIMER1 as its clock-source.
+ * Set up the STIMER1 to free-running (i.e. auto-reload) to start
+ * the generic timer counting (if we don't do this, udelay will not
+ * work and block indefinitively).
+ */
+static void secure_timer_init(void)
+{
+	struct rk_timer * const stimer1 =
+		(struct rk_timer * const)0xff830020;
+	const u32 TIMER_EN = BIT(0);
+
+	writel(~0u, &stimer1->timer_load_count0);
+	writel(~0u, &stimer1->timer_load_count1);
+	writel(TIMER_EN, &stimer1->timer_ctrl_reg);
+}
+
+/*
+ * The SPL (and also the full U-Boot stage on the RK3368) will run in
+ * secure mode (i.e. EL3) and an ATF will eventually be booted before
+ * starting up the operating system... so we can initialize the SGRF
+ * here and rely on the ATF installing the final (secure) policy
+ * later.
+ */
+static inline uintptr_t sgrf_soc_con_addr(unsigned no)
+{
+	const uintptr_t SGRF_BASE =
+		(uintptr_t)syscon_get_first_range(ROCKCHIP_SYSCON_SGRF);
+
+	return SGRF_BASE + sizeof(u32) * no;
+}
+
+static inline uintptr_t sgrf_busdmac_addr(unsigned no)
+{
+	const uintptr_t SGRF_BASE =
+		(uintptr_t)syscon_get_first_range(ROCKCHIP_SYSCON_SGRF);
+	const uintptr_t SGRF_BUSDMAC_OFFSET = 0x100;
+	const uintptr_t SGRF_BUSDMAC_BASE = SGRF_BASE + SGRF_BUSDMAC_OFFSET;
+
+	return SGRF_BUSDMAC_BASE + sizeof(u32) * no;
+}
+
+static void sgrf_init(void)
+{
+	struct rk3368_cru * const cru =
+		(struct rk3368_cru * const)rockchip_get_cru();
+	const u16 SGRF_SOC_CON_SEC = GENMASK(15, 0);
+	const u16 SGRF_BUSDMAC_CON0_SEC = BIT(2);
+	const u16 SGRF_BUSDMAC_CON1_SEC = GENMASK(15, 12);
+
+	/* Set all configurable IP to 'non secure'-mode */
+	rk_setreg(sgrf_soc_con_addr(5), SGRF_SOC_CON_SEC);
+	rk_setreg(sgrf_soc_con_addr(6), SGRF_SOC_CON_SEC);
+	rk_setreg(sgrf_soc_con_addr(7), SGRF_SOC_CON_SEC);
+
+	/*
+	 * From rockchip-uboot/arch/arm/cpu/armv8/rk33xx/cpu.c
+	 * Original comment: "ddr space set no secure mode"
+	 */
+	rk_clrreg(sgrf_soc_con_addr(8), SGRF_SOC_CON_SEC);
+	rk_clrreg(sgrf_soc_con_addr(9), SGRF_SOC_CON_SEC);
+	rk_clrreg(sgrf_soc_con_addr(10), SGRF_SOC_CON_SEC);
+
+	/* Set 'secure dma' to 'non secure'-mode */
+	rk_setreg(sgrf_busdmac_addr(0), SGRF_BUSDMAC_CON0_SEC);
+	rk_setreg(sgrf_busdmac_addr(1), SGRF_BUSDMAC_CON1_SEC);
+
+	dsb();  /* barrier */
+
+	rk_setreg(&cru->softrst_con[1], DMA1_SRST_REQ);
+	rk_setreg(&cru->softrst_con[4], DMA2_SRST_REQ);
+
+	dsb();  /* barrier */
+	udelay(10);
+
+	rk_clrreg(&cru->softrst_con[1], DMA1_SRST_REQ);
+	rk_clrreg(&cru->softrst_con[4], DMA2_SRST_REQ);
+}
+
+void board_debug_uart_init(void)
+{
+	/*
+	 * N.B.: This is called before the device-model has been
+	 *       initialised. For this reason, we can not access
+	 *       the GRF address range using the syscon API.
+	 */
+	struct rk3368_grf * const grf =
+		(struct rk3368_grf * const)0xff770000;
+
+	enum {
+		GPIO2D1_MASK            = GENMASK(3, 2),
+		GPIO2D1_GPIO            = 0,
+		GPIO2D1_UART0_SOUT      = (1 << 2),
+
+		GPIO2D0_MASK            = GENMASK(1, 0),
+		GPIO2D0_GPIO            = 0,
+		GPIO2D0_UART0_SIN       = (1 << 0),
+	};
+
+#if defined(CONFIG_DEBUG_UART_BASE) && (CONFIG_DEBUG_UART_BASE == 0xff180000)
+	/* Enable early UART0 on the RK3368 */
+	rk_clrsetreg(&grf->gpio2d_iomux,
+		     GPIO2D0_MASK, GPIO2D0_UART0_SIN);
+	rk_clrsetreg(&grf->gpio2d_iomux,
+		     GPIO2D1_MASK, GPIO2D1_UART0_SOUT);
+#endif
+}
+
+void board_init_f(ulong dummy)
+{
+	struct udevice *dev;
+	int ret;
+
+#define EARLY_UART
+#ifdef EARLY_UART
+	/*
+	 * Debug UART can be used from here if required:
+	 *
+	 * debug_uart_init();
+	 * printch('a');
+	 * printhex8(0x1234);
+	 * printascii("string");
+	 */
+	debug_uart_init();
+	printascii("U-Boot TPL board init\n");
+#endif
+
+	ret = spl_early_init();
+	if (ret) {
+		debug("spl_early_init() failed: %d\n", ret);
+		hang();
+	}
+
+	/* Make sure the ARMv8 generic timer counts */
+	secure_timer_init();
+	/* Reset security, so we can use DMA in the MMC drivers */
+	sgrf_init();
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		debug("DRAM init failed: %d\n", ret);
+		return;
+	}
+}
+
+void board_return_to_bootrom(void)
+{
+	back_to_bootrom();
+}
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_BOOTROM;
+}

arch/arm/mach-rockchip/rk3368/u-boot-tpl.lds

@@ -0,0 +1,13 @@
+/*
+ * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#undef CONFIG_SPL_TEXT_BASE
+#define CONFIG_SPL_TEXT_BASE CONFIG_TPL_TEXT_BASE
+
+#undef CONFIG_SPL_MAX_SIZE
+#define CONFIG_SPL_MAX_SIZE CONFIG_TPL_MAX_SIZE
+
+#include "../../cpu/armv8/u-boot-spl.lds"