arm: armada-xp: Add SPL support used to include the DDR training code

This patch adds SPL support to the Marvell Armada-XP. With this addition
the bin_hdr integration is not needed any more. The SPL will first
initialize the serdes/PHY and the call the DDR setup and training code
now integrated into mainline U-Boot.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Luka Perkov <luka.perkov@sartura.hr>

arch/arm/cpu/armv7/armada-xp/Makefile

@@ -5,3 +5,5 @@
 #
 
 obj-y	= cpu.o
+obj-$(CONFIG_SPL_BUILD) += spl.o
+obj-$(CONFIG_SPL_BUILD) += lowlevel_spl.o

arch/arm/cpu/armv7/armada-xp/lowlevel_spl.S

@@ -0,0 +1,62 @@
+/*
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <version.h>
+#include <linux/linkage.h>
+
+ENTRY(save_boot_params)
+	bx	lr
+ENDPROC(save_boot_params)
+
+/*
+ * cache_inv - invalidate Cache line
+ * r0 - dest
+ */
+	.global cache_inv
+	.type  cache_inv, %function
+	cache_inv:
+
+	stmfd   sp!, {r1-r12}
+
+	mcr     p15, 0, r0, c7, c6, 1
+
+	ldmfd   sp!, {r1-r12}
+	bx      lr
+
+
+/*
+ * flush_l1_v6 - l1 cache clean invalidate
+ * r0 - dest
+ */
+	.global flush_l1_v6
+	.type	flush_l1_v6, %function
+	flush_l1_v6:
+
+	stmfd   sp!, {r1-r12}
+
+	mcr     p15, 0, r0, c7, c10, 5	/* @ data memory barrier */
+	mcr     p15, 0, r0, c7, c14, 1	/* @ clean & invalidate D line */
+	mcr     p15, 0, r0, c7, c10, 4	/* @ data sync barrier */
+
+	ldmfd   sp!, {r1-r12}
+	bx      lr
+
+
+/*
+ * flush_l1_v7 - l1 cache clean invalidate
+ * r0 - dest
+ */
+	.global flush_l1_v7
+	.type	flush_l1_v7, %function
+	flush_l1_v7:
+
+	stmfd   sp!, {r1-r12}
+
+	dmb				/* @data memory barrier */
+	mcr     p15, 0, r0, c7, c14, 1	/* @ clean & invalidate D line */
+	dsb				/* @data sync barrier */
+
+	ldmfd   sp!, {r1-r12}
+	bx      lr

arch/arm/cpu/armv7/armada-xp/spl.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2014 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+u32 spl_boot_device(void)
+{
+	/* Right now only booting via SPI NOR flash is supported */
+	return BOOT_DEVICE_SPI;
+}
+
+void board_init_f(ulong dummy)
+{
+	/* Set global data pointer */
+	gd = &gdata;
+
+	/* Linux expects the internal registers to be at 0xf1000000 */
+	arch_cpu_init();
+
+	preloader_console_init();
+
+	/* First init the serdes PHY's */
+	serdes_phy_config();
+
+	/* Setup DDR */
+	ddr3_init();
+
+	board_init_r(NULL, 0);
+}

arch/arm/include/asm/arch-armada-xp/cpu.h

@@ -106,5 +106,18 @@ unsigned int mvebu_sdram_bar(enum memory_bank bank);
 unsigned int mvebu_sdram_bs(enum memory_bank bank);
 void mvebu_sdram_size_adjust(enum memory_bank bank);
 int mvebu_mbus_probe(struct mbus_win windows[], int count);
+
+/*
+ * Highspeed SERDES PHY config init, ported from bin_hdr
+ * to mainline U-Boot
+ */
+int serdes_phy_config(void);
+
+/*
+ * DDR3 init / training code ported from Marvell bin_hdr. Now
+ * available in mainline U-Boot in:
+ * drivers/ddr/mvebu/
+ */
+int ddr3_init(void);
 #endif /* __ASSEMBLY__ */
 #endif /* _ARMADA_XP_CPU_H */

arch/arm/mvebu-common/u-boot-spl.lds

@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *	Aneesh V <aneesh@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+MEMORY { .sram : ORIGIN = CONFIG_SPL_TEXT_BASE,\
+		LENGTH = CONFIG_SPL_MAX_SIZE }
+MEMORY { .sdram : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \
+		LENGTH = CONFIG_SPL_BSS_MAX_SIZE }
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+	.text      :
+	{
+		__start = .;
+		arch/arm/cpu/armv7/start.o	(.text*)
+		*(.text*)
+		*(.vectors)
+	} >.sram
+
+	. = ALIGN(4);
+	.rodata : { *(SORT_BY_ALIGNMENT(.rodata*)) } >.sram
+
+	. = ALIGN(4);
+	.data : { *(SORT_BY_ALIGNMENT(.data*)) } >.sram
+
+	. = ALIGN(4);
+	.u_boot_list : {
+		KEEP(*(SORT(.u_boot_list*_i2c_*)));
+	} >.sram
+
+	. = ALIGN(4);
+	__image_copy_end = .;
+
+	.end :
+	{
+		*(.__end)
+	}
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start = .;
+		*(.bss*)
+		. = ALIGN(4);
+		__bss_end = .;
+	} >.sdram
+}