[U-Boot] [PATCH v4 19/23] tegra: Add EMC settings for Seaboard

Simon Glass
2012-04-05T21:55:12Z

From: Jimmy Zhang <jimmzhang@nvidia.com>

Set Seaboard to optimal memory settings based on the SOC in use (T20 or T25).

Signed-off-by: Simon Glass <sjg@chromium.org>
---
Changes in v2:
- Move EMC tables to device tree
- Removed check for nominal voltage (not needed as it is done just before)

Changes in v3:
- Add better error reporting when EMC setup fails

Changes in v4:
- Remove support for T20 memory timings

board/nvidia/common/Makefile | 1 +
board/nvidia/common/board.c | 13 ++++++++-
board/nvidia/common/emc.c | 53 ++++++++++++++++++++++++++++++++++++++++++
board/nvidia/common/emc.h | 29 +++++++++++++++++++++++
4 files changed, 94 insertions(+), 2 deletions(-)
create mode 100644 board/nvidia/common/emc.c
create mode 100644 board/nvidia/common/emc.h

diff --git a/board/nvidia/common/Makefile b/board/nvidia/common/Makefile
index 3e748fd..a93d458 100644
--- a/board/nvidia/common/Makefile
+++ b/board/nvidia/common/Makefile
@@ -27,6 +27,7 @@ LIB = $(obj)lib$(VENDOR).o

COBJS-y += board.o
COBJS-$(CONFIG_SPI_UART_SWITCH) += uart-spi-switch.o
+COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o

COBJS := $(COBJS-y)
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index 1d6b002..e2cdb6e 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -30,6 +30,7 @@
#include <asm/arch/board.h>
#include <asm/arch/clk_rst.h>
#include <asm/arch/clock.h>
+#include <asm/arch/emc.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/pmc.h>
#include <asm/arch/pmu.h>
@@ -39,6 +40,7 @@
#include <asm/arch/usb.h>
#include <i2c.h>
#include "board.h"
+#include "emc.h"

DECLARE_GLOBAL_DATA_PTR;

@@ -82,6 +84,8 @@ static void power_det_init(void)
*/
int board_init(void)
{
+ int err;
+
/* Do clocks and UART first so that printf() works */
clock_init();
clock_verify();
@@ -105,8 +109,13 @@ int board_init(void)
# ifdef CONFIG_TEGRA_PMU
if (pmu_set_nominal())
debug("Failed to select nominal voltages\n");
-# endif
-#endif
+# ifdef CONFIG_TEGRA_CLOCK_SCALING
+ err = board_emc_init();
+ if (err)
+ debug("Memory controller init failed: %d\n", err);
+# endif
+# endif /* CONFIG_TEGRA_PMU */
+#endif /* CONFIG_TEGRA_I2C */

#ifdef CONFIG_USB_EHCI_TEGRA
pin_mux_usb();
diff --git a/board/nvidia/common/emc.c b/board/nvidia/common/emc.c
new file mode 100644
index 0000000..e7f68a0
--- /dev/null
+++ b/board/nvidia/common/emc.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/ap20.h>
+#include <asm/arch/clk_rst.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/emc.h>
+#include <asm/arch/pmu.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/arch/tegra2.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* This rate is hard-coded for now, until fdt provides them */
+#define EMC_SDRAM_RATE_T25 (380000 * 2 * 1000)
+
+int board_emc_init(void)
+{
+ unsigned rate;
+
+ switch (tegra_get_chip_type()) {
+ default:
+ case TEGRA_SOC_T20:
+ debug("%s: EMC timings not supported for T20 Seaboard\n",
+ __func__);
+ return -1;
+ case TEGRA_SOC_T25:
+ rate = EMC_SDRAM_RATE_T25;
+ break;
+ }
+ return tegra_set_emc(gd->fdt_blob, rate);
+}
diff --git a/board/nvidia/common/emc.h b/board/nvidia/common/emc.h
new file mode 100644
index 0000000..ec1b115
--- /dev/null
+++ b/board/nvidia/common/emc.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
+ *
+ * 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
+ */
+
+#ifndef _NVIDIA_EMC_H_
+#define _NVIDIA_EMC_H_
+
+int board_emc_init(void);
+
+#endif
--
1.7.7.3