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>

1 files changed, 108 insertions, 0 deletions

diff --git a/board/davinci/dm355evm/dm355evm.c b/board/davinci/dm355evm/dm355evm.c
new file mode 100644
index 0000000..398f527
--- /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