board/p1_p2_rdb:Enable p1_p2_rdb boot from NAND/SD/SPI in SPL

In the earlier patches, the SPL/TPL fraamework was introduced.
For SD/SPI flash booting way, we introduce the SPL to enable a loader stub. The
SPL was loaded by the code from the internal on-chip ROM. The SPL initializes
the DDR according to the SPD and loads the final uboot image into DDR, then
jump to the DDR to begin execution.

For NAND booting way, the nand SPL has size limitation on some board(e.g.
P1010RDB), it can not be more than 4KB, we can call it "minimal SPL", So the
dynamic DDR driver doesn't fit into this minimum SPL. We added the TPL that is
loaded by the the minimal SPL. The TPL initializes the DDR according to the SPD
and loads the final uboot image into DDR,then jump to the DDR to begin execution.

This patch enabled SPL/TPL for P1_P2_RDB to support starting from NAND/SD/SPI
flash with SPL framework and initializing the DDR according to SPD in the SPL/TPL.
Because the minimal SPL load the TPL to L2 SRAM and the jump to the L2 SRAM to
execute, so the section .resetvec is no longer needed.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/board/freescale/p1_p2_rdb/spl_minimal.c b/board/freescale/p1_p2_rdb/spl_minimal.c
new file mode 100644
index 0000000..96a4d1c
--- /dev/null
+++ b/board/freescale/p1_p2_rdb/spl_minimal.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <ns16550.h>
+#include <asm/io.h>
+#include <nand.h>
+#include <linux/compiler.h>
+#include <asm/fsl_law.h>
+#include <fsl_ddr_sdram.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+#define SYSCLK_MASK	0x00200000
+#define BOARDREV_MASK	0x10100000
+
+#define SYSCLK_66	66666666
+#define SYSCLK_100	100000000
+
+unsigned long get_board_sys_clk(ulong dummy)
+{
+	ccsr_gpio_t *pgpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
+	u32 val_gpdat, sysclk_gpio;
+
+	val_gpdat = in_be32(&pgpio->gpdat);
+	sysclk_gpio = val_gpdat & SYSCLK_MASK;
+
+	if (sysclk_gpio == 0)
+		return SYSCLK_66;
+	else
+		return SYSCLK_100;
+
+	return 0;
+}
+
+void board_init_f(ulong bootflag)
+{
+	u32 plat_ratio;
+	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+#if defined(CONFIG_SYS_NAND_BR_PRELIM) && defined(CONFIG_SYS_NAND_OR_PRELIM)
+	set_lbc_br(0, CONFIG_SYS_NAND_BR_PRELIM);
+	set_lbc_or(0, CONFIG_SYS_NAND_OR_PRELIM);
+#endif
+
+	/* initialize selected port with appropriate baud rate */
+	plat_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_PLAT_RATIO;
+	plat_ratio >>= 1;
+	gd->bus_clk = CONFIG_SYS_CLK_FREQ * plat_ratio;
+
+	NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
+		     gd->bus_clk / 16 / CONFIG_BAUDRATE);
+
+	puts("\nNAND boot... ");
+
+	/* copy code to RAM and jump to it - this should not return */
+	/* NOTE - code has to be copied out of NAND buffer before
+	 * other blocks can be read.
+	 */
+	relocate_code(CONFIG_SPL_RELOC_STACK, 0, CONFIG_SPL_RELOC_TEXT_BASE);
+}
+
+void board_init_r(gd_t *gd, ulong dest_addr)
+{
+	puts("\nSecond program loader running in sram...");
+	nand_boot();
+}
+
+void putc(char c)
+{
+	if (c == '\n')
+		NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, '\r');
+
+	NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, c);
+}
+
+void puts(const char *str)
+{
+	while (*str)
+		putc(*str++);
+}