[U-Boot] [PATCH 08/12] OMAP3 SPL: Add identify_pop_memory function

[Tom Rini]

A number of boards are populated with a PoP chip for both DDR and NAND
memory.  So to determine DDR timings the NAND chip needs to be probed
and mfr/id returned to the board to make decisions with.  All of this
code is put into spl_pop_probe.c and controlled via
CONFIG_SPL_OMAP3_POP_PROBE.

Signed-off-by: Tom Rini <trini at ti.com>
---
 arch/arm/cpu/armv7/omap3/Makefile           |    3 +
 arch/arm/cpu/armv7/omap3/spl_pop_probe.c    |   84 +++++++++++++++++++++++++++
 arch/arm/include/asm/arch-omap3/sys_proto.h |    1 +
 3 files changed, 88 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/omap3/spl_pop_probe.c

diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
index 8e85891..772f3d4 100644
--- a/arch/arm/cpu/armv7/omap3/Makefile
+++ b/arch/arm/cpu/armv7/omap3/Makefile
@@ -31,6 +31,9 @@ COBJS	+= board.o
 COBJS	+= clock.o
 COBJS	+= mem.o
 COBJS	+= sys_info.o
+ifdef CONFIG_SPL_BUILD
+COBJS-$(CONFIG_SPL_OMAP3_POP_PROBE)	+= spl_pop_probe.o
+endif
 
 COBJS-$(CONFIG_EMIF4)	+= emif4.o
 COBJS-$(CONFIG_SDRC)	+= sdrc.o
diff --git a/arch/arm/cpu/armv7/omap3/spl_pop_probe.c b/arch/arm/cpu/armv7/omap3/spl_pop_probe.c
new file mode 100644
index 0000000..ca66dd9
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap3/spl_pop_probe.c
@@ -0,0 +1,84 @@
+/*
+ * (C) Copyright 2011
+ * Texas Instruments, <www.ti.com>
+ *
+ * Author :
+ *     Tom Rini <trini at ti.com>
+ *
+ * Initial Code from:
+ *     Richard Woodruff <r-woodruff2 at ti.com>
+ *     Jian Zhang <jzhang at ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <linux/mtd/nand.h>
+#include <asm/io.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/mem.h>
+
+#ifdef CONFIG_SPL_BUILD
+static struct gpmc *gpmc_config = (struct gpmc *)GPMC_BASE;
+
+/* nand_command: Send a flash command to the flash chip */
+static void nand_command(u8 command)
+{
+	writeb(command, &gpmc_config->cs[0].nand_cmd);
+
+	if (command == NAND_CMD_RESET) {
+		unsigned char ret_val;
+		nand_command(NAND_CMD_STATUS);
+		do {
+			/* Wait until ready */
+			ret_val = readl(&gpmc_config->cs[0].nand_dat);
+		} while ((ret_val & 0x40) != 0x40);
+	}
+}
+
+/*
+ * Many boards ship with a PoP chip of both NAND and DDR, so we need
+ * probe the NAND side, very earily, to see what it says and pass this
+ * along to the board.  The board code will then use this information
+ * to decide what DDR timings to use.
+ */
+void identify_pop_memory(int *mfr, int *id)
+{
+	/* Make sure that we have setup GPMC for NAND correctly. */
+	writel(M_NAND_GPMC_CONFIG1, &gpmc_config->cs[0].config1);
+	writel(M_NAND_GPMC_CONFIG2, &gpmc_config->cs[0].config2);
+	writel(M_NAND_GPMC_CONFIG3, &gpmc_config->cs[0].config3);
+	writel(M_NAND_GPMC_CONFIG4, &gpmc_config->cs[0].config4);
+	writel(M_NAND_GPMC_CONFIG5, &gpmc_config->cs[0].config5);
+	writel(M_NAND_GPMC_CONFIG6, &gpmc_config->cs[0].config6);
+
+	/* Enable the GPMC Mapping */
+	writel((((GPMC_SIZE_128M & 0xF) << 8) | ((NAND_BASE >> 24) & 0x3F) |
+				(1 << 6)), &gpmc_config->cs[0].config7);
+
+	sdelay(2000);
+
+	/* Issue a RESET and then READID */
+	nand_command(NAND_CMD_RESET);
+	nand_command(NAND_CMD_READID);
+
+	writeb(0x0, &gpmc_config->cs[0].nand_adr);
+
+	/* Read off the manufacturer and device id. */
+	*mfr = readb(&gpmc_config->cs[0].nand_dat);
+	*id = readb(&gpmc_config->cs[0].nand_dat);
+}
+#endif
diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
index a53d205..2a8b5c7 100644
--- a/arch/arm/include/asm/arch-omap3/sys_proto.h
+++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
@@ -38,6 +38,7 @@ void per_clocks_enable(void);
 void memif_init(void);
 void sdrc_init(void);
 void do_sdrc_init(u32, u32);
+void identify_pop_memory(int *, int *);
 void get_board_mem_timings(u32 *, u32 *, u32 *, u32 *, u32 *);
 void emif4_init(void);
 void gpmc_init(void);
-- 
1.7.0.4