soc/intel: Use correct terminology for SPI flash operations

FPR is an attribute of the SPI flash component and not of the SPI bus
itself. Rename functions, file names and Kconfig option to make sure
this is conveyed correctly.

BUG=None
BRANCH=None
TEST=Compiles successfully.

Change-Id: I9f06f1a8ee28b8c56db64ddd6a19dd9179c54f50
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17560
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/soc/intel/common/spi_flash.c b/src/soc/intel/common/spi_flash.c
new file mode 100644
index 0000000000..c7717c9fe9
--- /dev/null
+++ b/src/soc/intel/common/spi_flash.c
@@ -0,0 +1,66 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * 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.
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include "spi_flash.h"
+
+/*
+ * Protect range of SPI flash defined by [start, start+size-1] using Flash
+ * Protected Range (FPR) register if available.
+ */
+int spi_flash_protect(u32 start, u32 size)
+{
+	struct fpr_info fpr_info;
+	u32 end = start + size - 1;
+	u32 reg;
+	int fpr;
+	uintptr_t fpr_base;
+
+	if (spi_flash_get_fpr_info(&fpr_info) == -1) {
+		printk(BIOS_ERR, "ERROR: FPR Info not found!\n");
+		return -1;
+	}
+
+	fpr_base = fpr_info.base;
+
+	/* Find first empty FPR */
+	for (fpr = 0; fpr < fpr_info.max; fpr++) {
+		reg = read32((void *)fpr_base);
+		if (reg == 0)
+			break;
+		fpr_base += sizeof(uint32_t);
+	}
+
+	if (fpr >= fpr_info.max) {
+		printk(BIOS_ERR, "ERROR: No SPI FPR free!\n");
+		return -1;
+	}
+
+	/* Set protected range base and limit */
+	reg = SPI_FPR(start, end) | SPI_FPR_WPE;
+
+	/* Set the FPR register and verify it is protected */
+	write32((void *)fpr_base, reg);
+	reg = read32((void *)fpr_base);
+	if (!(reg & SPI_FPR_WPE)) {
+		printk(BIOS_ERR, "ERROR: Unable to set SPI FPR %d\n", fpr);
+		return -1;
+	}
+
+	printk(BIOS_INFO, "%s: FPR %d is enabled for range 0x%08x-0x%08x\n",
+	       __func__, fpr, start, end);
+	return 0;
+}