aedbfc8f09
Write-protect SPI flash range provided by caller by using a free Flash Protected Range (FPR) register. This expects SoC to define a callback for providing information about the first FPR register address and maximum number of FPRs supported. BUG=chrome-os-partner:58896 Change-Id: I4e34ede8784e5587a5e08ffa10e20d2d14e20add Signed-off-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/17115 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2016 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/io.h>
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#include <console/console.h>
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#include "spi.h"
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/*
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* Protect range of SPI flash defined by [start, start+size-1] using Flash
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* Protected Range (FPR) register if available.
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*/
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int spi_flash_protect(u32 start, u32 size)
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{
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struct fpr_info fpr_info;
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u32 end = start + size - 1;
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u32 reg;
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int fpr;
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uintptr_t fpr_base;
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if (spi_get_fpr_info(&fpr_info) == -1) {
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printk(BIOS_ERR, "ERROR: FPR Info not found!\n");
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return -1;
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}
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fpr_base = fpr_info.base;
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/* Find first empty FPR */
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for (fpr = 0; fpr < fpr_info.max; fpr++) {
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reg = read32((void *)fpr_base);
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if (reg == 0)
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break;
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fpr_base += sizeof(uint32_t);
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}
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if (fpr >= fpr_info.max) {
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printk(BIOS_ERR, "ERROR: No SPI FPR free!\n");
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return -1;
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}
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/* Set protected range base and limit */
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reg = SPI_FPR(start, end) | SPI_FPR_WPE;
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/* Set the FPR register and verify it is protected */
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write32((void *)fpr_base, reg);
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reg = read32((void *)fpr_base);
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if (!(reg & SPI_FPR_WPE)) {
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printk(BIOS_ERR, "ERROR: Unable to set SPI FPR %d\n", fpr);
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return -1;
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}
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printk(BIOS_INFO, "%s: FPR %d is enabled for range 0x%08x-0x%08x\n",
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__func__, fpr, start, end);
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return 0;
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}
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