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-rw-r--r--src/soc/intel/apollolake/chip.c4
-rw-r--r--src/soc/intel/common/block/include/intelblocks/pmclib.h11
-rw-r--r--src/soc/intel/common/block/pmc/pmclib.c29
3 files changed, 17 insertions, 27 deletions
diff --git a/src/soc/intel/apollolake/chip.c b/src/soc/intel/apollolake/chip.c
index 1aab8a1b7a..6c195bb6fd 100644
--- a/src/soc/intel/apollolake/chip.c
+++ b/src/soc/intel/apollolake/chip.c
@@ -418,10 +418,8 @@ static void soc_init(void *data)
static void soc_final(void *data)
{
- /* Disable global reset, just in case */
- pmc_global_reset_enable(0);
/* Make sure payload/OS can't trigger global reset */
- pmc_global_reset_lock();
+ pmc_global_reset_disable_and_lock();
}
static void disable_dev(struct device *dev, FSP_S_CONFIG *silconfig)
diff --git a/src/soc/intel/common/block/include/intelblocks/pmclib.h b/src/soc/intel/common/block/include/intelblocks/pmclib.h
index 7cc501df7e..b622a74b9b 100644
--- a/src/soc/intel/common/block/include/intelblocks/pmclib.h
+++ b/src/soc/intel/common/block/include/intelblocks/pmclib.h
@@ -133,10 +133,15 @@ void pmc_clear_prsts(void);
*/
void pmc_global_reset_enable(bool enable);
/*
- * If possible, lock 0xcf9. Once the register is locked, it can't be changed.
- * This lock is reset on cold boot, hard reset, soft reset and Sx.
+ * Disable global reset and lock the CF9 global reset register in accordance to PCH ME BWG
+ * sections 4.4.1, 4.5.1 and 18.4 and the PCH datasheet(s) (Intel doc e.g. 332691-002EN,
+ * 332996-002EN). Deviate from the BGW we don't depend on the Intel ME state because Intel
+ * FPT (Flash Programming Tool) normally is not used with coreboot.
+ *
+ * Once the register is locked, it can't be changed. This lock is reset on cold boot, hard
+ * reset, soft reset and Sx.
*/
-void pmc_global_reset_lock(void);
+void pmc_global_reset_disable_and_lock(void);
/* Returns the power state structure */
struct chipset_power_state *pmc_get_power_state(void);
diff --git a/src/soc/intel/common/block/pmc/pmclib.c b/src/soc/intel/common/block/pmc/pmclib.c
index d7362b6dc4..82b391b958 100644
--- a/src/soc/intel/common/block/pmc/pmclib.c
+++ b/src/soc/intel/common/block/pmc/pmclib.c
@@ -420,37 +420,24 @@ int pmc_fill_power_state(struct chipset_power_state *ps)
}
#if CONFIG(PMC_GLOBAL_RESET_ENABLE_LOCK)
-/*
- * If possible, lock 0xcf9. Once the register is locked, it can't be changed.
- * This lock is reset on cold boot, hard reset, soft reset and Sx.
- */
-void pmc_global_reset_lock(void)
+void pmc_global_reset_disable_and_lock(void)
{
- /* Read PMC base address from soc */
- uintptr_t etr = soc_read_pmc_base() + ETR;
+ uint32_t *etr = soc_pmc_etr_addr();
uint32_t reg;
- reg = read32((void *)etr);
- if (reg & CF9_LOCK)
- return;
- reg |= CF9_LOCK;
- write32((void *)etr, reg);
+ reg = read32(etr);
+ reg = (reg & ~CF9_GLB_RST) | CF9_LOCK;
+ write32(etr, reg);
}
-/*
- * Enable or disable global reset. If global reset is enabled, hard reset and
- * soft reset will trigger global reset, where both host and TXE are reset.
- * This is cleared on cold boot, hard reset, soft reset and Sx.
- */
void pmc_global_reset_enable(bool enable)
{
- /* Read PMC base address from soc */
- uintptr_t etr = soc_read_pmc_base() + ETR;
+ uint32_t *etr = soc_pmc_etr_addr();
uint32_t reg;
- reg = read32((void *)etr);
+ reg = read32(etr);
reg = enable ? reg | CF9_GLB_RST : reg & ~CF9_GLB_RST;
- write32((void *)etr, reg);
+ write32(etr, reg);
}
#endif // CONFIG_PMC_GLOBAL_RESET_ENABLE_LOCK