MPC8308RDB: minimal support for devboard from Freescale

This patch provides support for MPC8308RDB development board from
Freescale with a minimal set of features:
 Dual UART is supported
 NOR flash is supported
 Both TSEC Ethernet controllers are supported
 PCI Express initialization is supported

The following features are enabled in configuration but not fully tested:
 I2C (used to get the board revision)
 I2C-connected RTC
 VSC7385 switch

There is one (hopefully) minor issue: on soft reset the board sometimes
resets twice. I've not managed to find the fix for this problem yet.
As a workaround instruction cache can be disabled.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/board/freescale/mpc8308rdb/sdram.c b/board/freescale/mpc8308rdb/sdram.c
new file mode 100644
index 0000000..939c1b8
--- /dev/null
+++ b/board/freescale/mpc8308rdb/sdram.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2007 Freescale Semiconductor, Inc.
+ * Copyright (C) 2010 Ilya Yanok, Emcraft Systems, yanok@emcraft.com
+ *
+ * Authors: Nick.Spence@freescale.com
+ *          Wilson.Lo@freescale.com
+ *          scottwood@freescale.com
+ *
+ * This files is  mostly identical to the original from
+ * board\freescale\mpc8315erdb\sdram.c
+ *
+ * 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 <common.h>
+#include <mpc83xx.h>
+
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void resume_from_sleep(void)
+{
+	u32 magic = *(u32 *)0;
+
+	typedef void (*func_t)(void);
+	func_t resume = *(func_t *)4;
+
+	if (magic == 0xf5153ae5)
+		resume();
+
+	gd->flags &= ~GD_FLG_SILENT;
+	puts("\nResume from sleep failed: bad magic word\n");
+}
+
+/* Fixed sdram init -- doesn't use serial presence detect.
+ *
+ * This is useful for faster booting in configs where the RAM is unlikely
+ * to be changed, or for things like NAND booting where space is tight.
+ */
+static long fixed_sdram(void)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
+	u32 msize_log2 = __ilog2(msize);
+
+	out_be32(&im->sysconf.ddrlaw[0].bar,
+			CONFIG_SYS_DDR_SDRAM_BASE  & 0xfffff000);
+	out_be32(&im->sysconf.ddrlaw[0].ar, LBLAWAR_EN | (msize_log2 - 1));
+	out_be32(&im->sysconf.ddrcdr, CONFIG_SYS_DDRCDR_VALUE);
+
+	/*
+	 * Erratum DDR3 requires a 50ms delay after clearing DDRCDR[DDR_cfg],
+	 * or the DDR2 controller may fail to initialize correctly.
+	 */
+	udelay(50000);
+
+	out_be32(&im->ddr.csbnds[0].csbnds, (msize - 1) >> 24);
+	out_be32(&im->ddr.cs_config[0], CONFIG_SYS_DDR_CS0_CONFIG);
+
+	/* Currently we use only one CS, so disable the other bank. */
+	out_be32(&im->ddr.cs_config[1], 0);
+
+	out_be32(&im->ddr.sdram_clk_cntl, CONFIG_SYS_DDR_SDRAM_CLK_CNTL);
+	out_be32(&im->ddr.timing_cfg_3, CONFIG_SYS_DDR_TIMING_3);
+	out_be32(&im->ddr.timing_cfg_1, CONFIG_SYS_DDR_TIMING_1);
+	out_be32(&im->ddr.timing_cfg_2, CONFIG_SYS_DDR_TIMING_2);
+	out_be32(&im->ddr.timing_cfg_0, CONFIG_SYS_DDR_TIMING_0);
+
+	if (in_be32(&im->pmc.pmccr1) & PMCCR1_POWER_OFF) {
+		out_be32(&im->ddr.sdram_cfg,
+			CONFIG_SYS_DDR_SDRAM_CFG | SDRAM_CFG_BI);
+	} else {
+		out_be32(&im->ddr.sdram_cfg, CONFIG_SYS_DDR_SDRAM_CFG);
+	}
+
+	out_be32(&im->ddr.sdram_cfg2, CONFIG_SYS_DDR_SDRAM_CFG2);
+	out_be32(&im->ddr.sdram_mode, CONFIG_SYS_DDR_MODE);
+	out_be32(&im->ddr.sdram_mode2, CONFIG_SYS_DDR_MODE2);
+
+	out_be32(&im->ddr.sdram_interval, CONFIG_SYS_DDR_INTERVAL);
+	sync();
+
+	/* enable DDR controller */
+	setbits_be32(&im->ddr.sdram_cfg, SDRAM_CFG_MEM_EN);
+	sync();
+
+	return get_ram_size(CONFIG_SYS_DDR_SDRAM_BASE, msize);
+}
+
+phys_size_t initdram(int board_type)
+{
+	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
+	u32 msize;
+
+	if ((in_be32(&im->sysconf.immrbar) & IMMRBAR_BASE_ADDR) != (u32)im)
+		return -1;
+
+	/* DDR SDRAM */
+	msize = fixed_sdram();
+
+	if (in_be32(&im->pmc.pmccr1) & PMCCR1_POWER_OFF)
+		resume_from_sleep();
+
+	/* return total bus SDRAM size(bytes)  -- DDR */
+	return msize;
+}