southbridge/intel: Add fsp_rangeley support

This adds the southbridge initialization pieces for Intel's Atom C2000
processor (formerly Rangeley).  It is intended to be used with the Intel
Atom C2000 FSP and does not contain all of the pieces that would
otherwise be required for initialization.

Change-Id: I416e85bd6e9c9dcf79f97785074135902fdd18b7
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: http://review.coreboot.org/6370
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/src/southbridge/intel/fsp_rangeley/early_spi.c b/src/southbridge/intel/fsp_rangeley/early_spi.c
new file mode 100644
index 0000000000..ef8cc98fc6
--- /dev/null
+++ b/src/southbridge/intel/fsp_rangeley/early_spi.c
@@ -0,0 +1,114 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google Inc.  All rights reserved.
+ *
+ * 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; version 2 of
+ * the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <device/pci_ids.h>
+#include <device/pci_def.h>
+#include <delay.h>
+#include "soc.h"
+
+#define SPI_DELAY 10     /* 10us */
+#define SPI_RETRY 200000 /* 2s */
+
+static int early_spi_read_block(u32 offset, u8 size, u8 *buffer)
+{
+	u32 *ptr32 = (u32*)buffer;
+	u32 i;
+
+	/* Clear status bits */
+	RCBA16(SPIBAR_HSFS) |= SPIBAR_HSFS_AEL | SPIBAR_HSFS_FCERR |
+		SPIBAR_HSFS_FDONE;
+
+	if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_SCIP) {
+		printk(BIOS_ERR, "SPI ERROR: transaction in progress\n");
+		return -1;
+	}
+
+	/* Set flash address */
+	RCBA32(SPIBAR_FADDR) = offset;
+
+	/* Setup read transaction */
+	RCBA16(SPIBAR_HSFC) = SPIBAR_HSFC_BYTE_COUNT(size) |
+		SPIBAR_HSFC_CYCLE_READ;
+
+	/* Start transactinon */
+	RCBA16(SPIBAR_HSFC) |= SPIBAR_HSFC_GO;
+
+	/* Wait for completion */
+	for (i = 0; i < SPI_RETRY; i++) {
+		if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_SCIP) {
+			/* Cycle in progress, wait 1ms */
+			udelay(SPI_DELAY);
+			continue;
+		}
+
+		if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_AEL) {
+			printk(BIOS_ERR, "SPI ERROR: Access Error\n");
+			return -1;
+
+		}
+
+		if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_FCERR) {
+			printk(BIOS_ERR, "SPI ERROR: Flash Cycle Error\n");
+			return -1;
+		}
+		break;
+	}
+
+	if (i >= SPI_RETRY) {
+		printk(BIOS_ERR, "SPI ERROR: Timeout\n");
+		return -1;
+	}
+
+	/* Read the data */
+	for (i = 0; i < size; i+=sizeof(u32)) {
+		if (size-i >= 4) {
+			/* reading >= dword */
+			*ptr32++ = RCBA32(SPIBAR_FDATA(i/sizeof(u32)));
+		} else {
+			/* reading < dword */
+			u8 j, *ptr8 = (u8*)ptr32;
+			u32 temp = RCBA32(SPIBAR_FDATA(i/sizeof(u32)));
+			for (j = 0; j < (size-i); j++) {
+				*ptr8++ = temp & 0xff;
+				temp >>= 8;
+			}
+		}
+	}
+
+	return size;
+}
+
+int early_spi_read(u32 offset, u32 size, u8 *buffer)
+{
+	u32 current = 0;
+
+	while (size > 0) {
+		u8 count = (size < 64) ? size : 64;
+		if (early_spi_read_block(offset + current, count,
+					 buffer + current) < 0)
+			return -1;
+		size -= count;
+		current += count;
+	}
+
+	return 0;
+}