[coreboot-gerrit] New patch to review for coreboot: skylake: Add function to set PRR for protecting flash
Duncan Laurie (dlaurie@chromium.org)
gerrit at coreboot.org
Wed Jun 8 03:21:34 CEST 2016
Duncan Laurie (dlaurie at chromium.org) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15102
-gerrit
commit fbd6e06c77434eee2eea251806021fac669d2e47
Author: Duncan Laurie <dlaurie at chromium.org>
Date: Thu Jun 2 15:23:42 2016 -0700
skylake: Add function to set PRR for protecting flash
Add a function similar to broadwell to set the PRR for a region of
flash and protect it from writes. This is used to secure the MRC
cache region if the SPI is write protected.
BUG=chrome-os-partner:54003
BRANCH=glados
TEST=boot on chell, verify PRR register is set and that the
MRC cache region cannot be written if the SPI is write protected.
Change-Id: I925ec9ce186f7adac327bca9c96255325b7f54ec
Signed-off-by: Duncan Laurie <dlaurie at chromium.org>
Original-Commit-Id: abb6f645f5ceef3f52bb7afd2632212ea916ff8d
Original-Change-Id: I2f90556a217b35b7c93645e41a1fcfe8070c53da
Original-Signed-off-by: Duncan Laurie <dlaurie at chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/349274
Original-Reviewed-by: Shawn N <shawnn at chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin at chromium.org>
Original-Tested-by: Shawn N <shawnn at chromium.org>
---
src/soc/intel/skylake/Kconfig | 1 +
src/soc/intel/skylake/flash_controller.c | 37 ++++++++++++++++++++++++++++++++
src/soc/intel/skylake/include/soc/spi.h | 14 +++++++++++-
3 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 1ac0647..9278cf1 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -25,6 +25,7 @@ config CPU_SPECIFIC_OPTIONS
select MMCONF_SUPPORT
select MMCONF_SUPPORT_DEFAULT
select NO_FIXED_XIP_ROM_SIZE
+ select MRC_SETTINGS_PROTECT
select PARALLEL_MP
select PCIEXP_ASPM
select PCIEXP_COMMON_CLOCK
diff --git a/src/soc/intel/skylake/flash_controller.c b/src/soc/intel/skylake/flash_controller.c
index 0af0484..3507b47 100644
--- a/src/soc/intel/skylake/flash_controller.c
+++ b/src/soc/intel/skylake/flash_controller.c
@@ -386,6 +386,43 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
return slave;
}
+int spi_flash_protect(u32 start, u32 size)
+{
+ pch_spi_regs *spi_bar = get_spi_bar();
+ u32 end = start + size - 1;
+ u32 reg;
+ int prr;
+
+ if (!spi_bar)
+ return -1;
+
+ /* Find first empty PRR */
+ for (prr = 0; prr < SPI_PRR_MAX; prr++) {
+ reg = read32(&spi_bar->pr[prr]);
+ if (reg == 0)
+ break;
+ }
+ if (prr >= SPI_PRR_MAX) {
+ printk(BIOS_ERR, "ERROR: No SPI PRR free!\n");
+ return -1;
+ }
+
+ /* Set protected range base and limit */
+ reg = SPI_PRR(start, end) | SPI_PRR_WPE;
+
+ /* Set the PRR register and verify it is protected */
+ write32(&spi_bar->pr[prr], reg);
+ reg = read32(&spi_bar->pr[prr]);
+ if (!(reg & SPI_PRR_WPE)) {
+ printk(BIOS_ERR, "ERROR: Unable to set SPI PRR %d\n", prr);
+ return -1;
+ }
+
+ printk(BIOS_INFO, "%s: PRR %d is enabled for range 0x%08x-0x%08x\n",
+ __func__, prr, start, end);
+ return 0;
+}
+
#if ENV_RAMSTAGE
/*
* spi_init() needs run unconditionally in every boot (including resume) to
diff --git a/src/soc/intel/skylake/include/soc/spi.h b/src/soc/intel/skylake/include/soc/spi.h
index 7991c16..c930b58 100644
--- a/src/soc/intel/skylake/include/soc/spi.h
+++ b/src/soc/intel/skylake/include/soc/spi.h
@@ -40,6 +40,17 @@
/* STRAP Data Register*/
#define SPIBAR_RESET_DATA 0xF8
+#define SPI_PRR_MAX 5
+#define SPI_PRR_SHIFT 12
+#define SPI_PRR_MASK 0x7fff
+#define SPI_PRR_BASE_SHIFT 0
+#define SPI_PRR_LIMIT_SHIFT 16
+#define SPI_PRR_RPE (1 << 15) /* Read Protect */
+#define SPI_PRR_WPE (1 << 31) /* Write Protect */
+#define SPI_PRR(base, limit) \
+ (((((limit) >> SPI_PRR_SHIFT) & SPI_PRR_MASK) << SPI_PRR_LIMIT_SHIFT) |\
+ ((((base) >> SPI_PRR_SHIFT) & SPI_PRR_MASK) << SPI_PRR_BASE_SHIFT))
+
#define SPI_OPMENU_0 0x01 /* WRSR: Write Status Register */
#define SPI_OPTYPE_0 0x01 /* Write, no address */
@@ -119,6 +130,7 @@
#define SPIBAR_BC_LE (1 << 2)
#define SPIBAR_BC_WPD (1 << 0)
-
void *get_spi_bar(void);
+int spi_flash_protect(u32 start, u32 size);
+
#endif
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