dm355 evm support

Initial U-Boot support for the DaVinci DM355 EVM.  This is a board
from Spectrum Digital.  Board docs include schematic and firmware
for its microcontroller:

  http://c6000.spectrumdigital.com/evmdm355/revd/

Most of the DM355 chip is fully documented by TI, the most notable
exception being the MPEG/JPEG coprocessor (programmable using codecs
available at no cost from TI), which is omitted from its DM335 sibling:

  http://focus.ti.com/docs/prod/folders/print/tms320dm355.html

This version can boot from the on-board DM9000 Ethernet chip, after
being loaded (from NAND, MMC/SD, or UART).  In the near future, NAND
and USB support could be added ... NAND support is being held back
until the support for the 4-bit ECC hardware is ready.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

3 files changed, 171 insertions, 0 deletions

diff --git a/board/davinci/dm355evm/Makefile b/board/davinci/dm355evm/Makefile
new file mode 100644
index 0000000000..26b0705465
--- /dev/null
+++ b/board/davinci/dm355evm/Makefile
@@ -0,0 +1,52 @@
+#
+# (C) Copyright 2000, 2001, 2002
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(BOARD).a
+
+COBJS	:= $(BOARD).o
+SOBJS	:=
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak $(obj).depend
+
+#########################################################################
+# This is for $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/board/davinci/dm355evm/config.mk b/board/davinci/dm355evm/config.mk
new file mode 100644
index 0000000000..c4e6e07b7c
--- /dev/null
+++ b/board/davinci/dm355evm/config.mk
@@ -0,0 +1,11 @@
+#
+# Spectrum Digital DM355 EVM board
+#	dm355evm board has 1 bank of 128 MB DDR RAM
+#	Physical Address: 8000'0000 to 8800'0000
+#
+# Linux Kernel is expected to be at 8000'8000, entry 8000'8000
+# (mem base + reserved)
+#
+
+#Provide at least 16MB spacing between us and the Linux Kernel image
+TEXT_BASE = 0x81080000
diff --git a/board/davinci/dm355evm/dm355evm.c b/board/davinci/dm355evm/dm355evm.c
new file mode 100644
index 0000000000..398f527759
--- /dev/null
+++ b/board/davinci/dm355evm/dm355evm.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2009 David Brownell
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <nand.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/emif_defs.h>
+#include <asm/arch/nand_defs.h>
+#include "../common/misc.h"
+
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * With the DM355 EVM, u-boot is *always* a third stage loader,
+ * unless a JTAG debugger handles the first two stages:
+ *
+ *   - 1st stage is ROM Boot Loader (RBL), which searches for a
+ *     second stage loader in one of three places based on SW7:
+ *     NAND (with MMC/SD fallback), MMC/SD, or UART.
+ *
+ *   - 2nd stage is User Boot Loader (UBL), using at most 30KB
+ *     of on-chip SRAM, responsible for lowlevel init, and for
+ *     loading the third stage loader into DRAM.
+ *
+ *   - 3rd stage, that's us!
+ */
+
+int board_init(void)
+{
+	gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DM355_EVM;
+	gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;
+
+	/* We expect the UBL to have handled "lowlevel init", which
+	 * involves setting up at least:
+	 *  - clocks
+	 *      + PLL1 (for ARM and peripherals) and PLL2 (for DDR)
+	 *      + clock divisors for those PLLs
+	 *      + LPSC_DDR module enabled
+	 *      + LPSC_TIMER0 module (still) enabled
+	 *  - EMIF
+	 *      + DDR init and timings
+	 *      + AEMIF timings (for NAND and DM9000)
+	 *  - pinmux
+	 *
+	 * Some of that is repeated here, mostly as a precaution.
+	 */
+
+	/* AEMIF:  Some "address" lines are available as GPIOs.  A3..A13
+	 * could be too if we used A12 as a GPIO during NAND chipselect
+	 * (and Linux did too), letting us control the LED on A7/GPIO61.
+	 */
+	REG(PINMUX2) = 0x0c08;
+
+	/* UART0 may still be in SyncReset if we didn't boot from UART */
+	davinci_enable_uart0();
+
+	/* EDMA may be in SyncReset too; turn it on, Linux won't (yet) */
+	lpsc_on(DAVINCI_LPSC_TPCC);
+	lpsc_on(DAVINCI_LPSC_TPTC0);
+	lpsc_on(DAVINCI_LPSC_TPTC1);
+
+	return 0;
+}
+
+#ifdef CONFIG_NAND_DAVINCI
+
+static void nand_dm355evm_select_chip(struct mtd_info *mtd, int chip)
+{
+	struct nand_chip	*this = mtd->priv;
+	u32			wbase = (u32) this->IO_ADDR_W;
+	u32			rbase = (u32) this->IO_ADDR_R;
+
+	if (chip == 1) {
+		__set_bit(14, &wbase);
+		__set_bit(14, &rbase);
+	} else {
+		__clear_bit(14, &wbase);
+		__clear_bit(14, &rbase);
+	}
+	this->IO_ADDR_W = (void *)wbase;
+	this->IO_ADDR_R = (void *)rbase;
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	davinci_nand_init(nand);
+	nand->select_chip = nand_dm355evm_select_chip;
+	return 0;
+}
+
+#endif