powerpc/t4rdb: Add SD boot support for T4240RDB board

This patch adds SD boot support for T4240RDB board. SPL
framework is used. PBL initializes the internal RAM and
copies SPL to it. Then SPL initializes DDR using SPD and
copies u-boot from SD card to DDR, finally SPL transfers
control to u-boot.

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
[York Sun: Fix T4240RDB_SDCARD_defcofig]
Reviewed-by: York Sun <yorksun@freescale.com>

7 files changed, 117 insertions, 8 deletions

diff --git a/board/freescale/t4rdb/MAINTAINERS b/board/freescale/t4rdb/MAINTAINERS
index 845c1b6..53ccabc 100644
--- a/board/freescale/t4rdb/MAINTAINERS
+++ b/board/freescale/t4rdb/MAINTAINERS
@@ -5,3 +5,4 @@ F:	board/freescale/t4rdb/
 F:	include/configs/T4240RDB.h
 F:	configs/T4160RDB_defconfig
 F:	configs/T4240RDB_defconfig
+F:	configs/T4240RDB_SDCARD_defconfig
diff --git a/board/freescale/t4rdb/Makefile b/board/freescale/t4rdb/Makefile
index 3886e3d..83b55ee 100644
--- a/board/freescale/t4rdb/Makefile
+++ b/board/freescale/t4rdb/Makefile
@@ -4,10 +4,14 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+else
 obj-$(CONFIG_T4240RDB) += t4240rdb.o
 obj-y	+= cpld.o
-obj-y	+= ddr.o
 obj-y	+= eth.o
 obj-$(CONFIG_PCI)	+= pci.o
+endif
+obj-y	+= ddr.o
 obj-y	+= law.o
 obj-y	+= tlb.o
diff --git a/board/freescale/t4rdb/ddr.c b/board/freescale/t4rdb/ddr.c
index 5a43c1b..27b37b5 100644
--- a/board/freescale/t4rdb/ddr.c
+++ b/board/freescale/t4rdb/ddr.c
@@ -108,11 +108,15 @@ phys_size_t initdram(int board_type)
 
 	puts("Initializing....using SPD\n");
 
+#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL)
 	dram_size = fsl_ddr_sdram();
 
 	dram_size = setup_ddr_tlbs(dram_size / 0x100000);
 	dram_size *= 0x100000;
+#else
+	/* DDR has been initialised by first stage boot loader */
+	dram_size = fsl_ddr_sdram_size();
+#endif
 
-	puts("    DDR: ");
 	return dram_size;
 }
diff --git a/board/freescale/t4rdb/spl.c b/board/freescale/t4rdb/spl.c
new file mode 100644
index 0000000..68ecde7
--- /dev/null
+++ b/board/freescale/t4rdb/spl.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * Author: Chunhe Lan <Chunhe.Lan@freescale.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/spl.h>
+#include <malloc.h>
+#include <ns16550.h>
+#include <nand.h>
+#include <mmc.h>
+#include <fsl_esdhc.h>
+#include <i2c.h>
+
+#include "t4rdb.h"
+
+#define FSL_CORENET_CCSR_PORSR1_RCW_MASK	0xFF800000
+
+DECLARE_GLOBAL_DATA_PTR;
+
+phys_size_t get_effective_memsize(void)
+{
+	return CONFIG_SYS_L3_SIZE;
+}
+
+unsigned long get_board_sys_clk(void)
+{
+	return CONFIG_SYS_CLK_FREQ;
+}
+
+unsigned long get_board_ddr_clk(void)
+{
+	return CONFIG_DDR_CLK_FREQ;
+}
+
+void board_init_f(ulong bootflag)
+{
+	u32 plat_ratio, sys_clk, ccb_clk;
+	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
+
+	/* Memcpy existing GD at CONFIG_SPL_GD_ADDR */
+	memcpy((void *)CONFIG_SPL_GD_ADDR, (void *)gd, sizeof(gd_t));
+
+	/* Update GD pointer */
+	gd = (gd_t *)(CONFIG_SPL_GD_ADDR);
+
+	/* compiler optimization barrier needed for GCC >= 3.4 */
+	__asm__ __volatile__("" : : : "memory");
+
+	console_init_f();
+
+	/* initialize selected port with appropriate baud rate */
+	sys_clk = get_board_sys_clk();
+	plat_ratio = (in_be32(&gur->rcwsr[0]) >> 25) & 0x1f;
+	ccb_clk = sys_clk * plat_ratio / 2;
+
+	NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
+		     ccb_clk / 16 / CONFIG_BAUDRATE);
+
+	puts("\nSD boot...\n");
+
+	relocate_code(CONFIG_SPL_RELOC_STACK, (gd_t *)CONFIG_SPL_GD_ADDR, 0x0);
+}
+
+void board_init_r(gd_t *gd, ulong dest_addr)
+{
+	bd_t *bd;
+
+	bd = (bd_t *)(gd + sizeof(gd_t));
+	memset(bd, 0, sizeof(bd_t));
+	gd->bd = bd;
+	bd->bi_memstart = CONFIG_SYS_INIT_L3_ADDR;
+	bd->bi_memsize = CONFIG_SYS_L3_SIZE;
+
+	probecpu();
+	get_clocks();
+	mem_malloc_init(CONFIG_SPL_RELOC_MALLOC_ADDR,
+			CONFIG_SPL_RELOC_MALLOC_SIZE);
+
+	mmc_initialize(bd);
+	mmc_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
+			   (uchar *)CONFIG_ENV_ADDR);
+
+	gd->env_addr  = (ulong)(CONFIG_ENV_ADDR);
+	gd->env_valid = 1;
+
+	i2c_init_all();
+
+	gd->ram_size = initdram(0);
+
+	mmc_boot();
+}
diff --git a/board/freescale/t4rdb/t4_pbi.cfg b/board/freescale/t4rdb/t4_pbi.cfg
index c9f8ced..e7bb673 100644
--- a/board/freescale/t4rdb/t4_pbi.cfg
+++ b/board/freescale/t4rdb/t4_pbi.cfg
@@ -19,9 +19,6 @@
 09000d00 00000000
 09000d04 fff80000
 09000d08 81000012
-#slow mdio clock
-095fc030 00008148
-095fd030 00808148
 #Configure alternate space
 09000010 00000000
 09000014 ff000000
diff --git a/board/freescale/t4rdb/t4_rcw.cfg b/board/freescale/t4rdb/t4_rcw.cfg
index e46c7b2..282fea4 100644
--- a/board/freescale/t4rdb/t4_rcw.cfg
+++ b/board/freescale/t4rdb/t4_rcw.cfg
@@ -2,6 +2,6 @@
 aa55aa55 010e0100
 #serdes protocol  27_55_1_9
 16070019 18101916 00000000 00000000
-6c6e0848 00448c00 6c020000 f5000000
-00000000 ee0000ee 00000000 000287fc
-00000000 50000000 00000000 00000028
+6c6e0848 00448c00 ec020000 f5000000
+00000000 ee0000ee 00000000 000307fc
+00000000 00000000 00000000 00000028
diff --git a/board/freescale/t4rdb/tlb.c b/board/freescale/t4rdb/tlb.c
index 474301e..6a6b4b5 100644
--- a/board/freescale/t4rdb/tlb.c
+++ b/board/freescale/t4rdb/tlb.c
@@ -51,6 +51,7 @@ struct fsl_e_tlb_entry tlb_table[] = {
 		      MAS3_SX|MAS3_SR, MAS2_W|MAS2_G,
 		      0, 2, BOOKE_PAGESZ_256M, 1),
 
+#ifndef CONFIG_SPL_BUILD
 	/* *I*G* - PCI */
 	SET_TLB_ENTRY(1, CONFIG_SYS_PCIE1_MEM_VIRT, CONFIG_SYS_PCIE1_MEM_PHYS,
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
@@ -91,6 +92,8 @@ struct fsl_e_tlb_entry tlb_table[] = {
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
 		      0, 12, BOOKE_PAGESZ_16M, 1),
 #endif
+#endif
+
 #ifdef CONFIG_SYS_DCSRBAR_PHYS
 	SET_TLB_ENTRY(1, CONFIG_SYS_DCSRBAR, CONFIG_SYS_DCSRBAR_PHYS,
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
@@ -111,6 +114,11 @@ struct fsl_e_tlb_entry tlb_table[] = {
 		      MAS3_SW|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
 		      0, 17, BOOKE_PAGESZ_4K, 1),
 #endif
+#if defined(CONFIG_RAMBOOT_PBL) && !defined(CONFIG_SPL_BUILD)
+	SET_TLB_ENTRY(1, CONFIG_SYS_DDR_SDRAM_BASE, CONFIG_SYS_DDR_SDRAM_BASE,
+		      MAS3_SX|MAS3_SW|MAS3_SR, 0,
+		      0, 18, BOOKE_PAGESZ_2G, 1)
+#endif
 };
 
 int num_tlb_entries = ARRAY_SIZE(tlb_table);