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authorMarshall Dawson <marshalldawson3rd@gmail.com>2019-09-04 11:00:06 -0600
committerMartin Roth <martinroth@google.com>2019-09-09 22:19:33 +0000
commitba2533f0ee952a2bbe90ed60d5ab3d4c19513aa0 (patch)
treec2475556183b1e5dee88872b8f546b9e27b84e66 /src
parent5aacda4b9824cebcc7d5f816419b6f9cc82be8a0 (diff)
downloadcoreboot-ba2533f0ee952a2bbe90ed60d5ab3d4c19513aa0.tar.xz
soc/amd/common/lpc: Add decode disable function
It is already trivial to set D14F3x44 to 0, but add a function to wipe both that and the settings in D14F3x48, along with x48's associated addresses. Change-Id: Ibec25562b2a1568681aea7caf86f00094c436a50 Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35270 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Diffstat (limited to 'src')
-rw-r--r--src/soc/amd/common/block/include/amdblocks/lpc.h4
-rw-r--r--src/soc/amd/common/block/lpc/lpc_util.c19
2 files changed, 23 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/include/amdblocks/lpc.h b/src/soc/amd/common/block/include/amdblocks/lpc.h
index 6b6745d9cb..f956ba3aa9 100644
--- a/src/soc/amd/common/block/include/amdblocks/lpc.h
+++ b/src/soc/amd/common/block/include/amdblocks/lpc.h
@@ -68,6 +68,7 @@
#define DECODE_IO_PORT_ENABLE2 BIT(18)
#define DECODE_IO_PORT_ENABLE1 BIT(17)
#define DECODE_IO_PORT_ENABLE0 BIT(16)
+#define LPC_SYNC_TIMEOUT_COUNT_MASK (0xff << 8)
#define LPC_SYNC_TIMEOUT_COUNT_ENABLE BIT(7)
#define LPC_DECODE_RTC_IO_ENABLE BIT(6)
#define DECODE_MEM_PORT_ENABLE0 BIT(5)
@@ -134,6 +135,9 @@
#define PREFETCH_EN_SPI_FROM_HOST BIT(0)
#define T_START_ENH BIT(3)
+/* Clear all decoding to the LPC bus and erase any range registers associated
+ * with the enable bits. */
+void lpc_disable_decodes(void);
/* LPC is typically enabled very early, but this function is last opportunity */
void soc_late_lpc_bridge_enable(void);
void lpc_enable_port80(void);
diff --git a/src/soc/amd/common/block/lpc/lpc_util.c b/src/soc/amd/common/block/lpc/lpc_util.c
index 008d14c34e..1d46acbf5c 100644
--- a/src/soc/amd/common/block/lpc/lpc_util.c
+++ b/src/soc/amd/common/block/lpc/lpc_util.c
@@ -170,6 +170,25 @@ void lpc_enable_decode(uint32_t decodes)
pci_write_config32(_LPCB_DEV, LPC_IO_PORT_DECODE_ENABLE, decodes);
}
+/*
+ * Clear all decoding to the LPC bus and erase any range registers associated
+ * with the enable bits.
+ */
+void lpc_disable_decodes(void)
+{
+ uint32_t reg;
+
+ lpc_enable_decode(0);
+ reg = pci_read_config32(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE);
+ reg &= LPC_SYNC_TIMEOUT_COUNT_MASK | LPC_SYNC_TIMEOUT_COUNT_ENABLE;
+ pci_write_config32(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE, reg);
+
+ /* D14F3x48 enables ranges configured in additional registers */
+ pci_write_config32(_LPCB_DEV, LPC_MEM_PORT1, 0);
+ pci_write_config32(_LPCB_DEV, LPC_MEM_PORT0, 0);
+ pci_write_config32(_LPCB_DEV, LPC_WIDEIO2_GENERIC_PORT, 0);
+}
+
uintptr_t lpc_spibase(void)
{
u32 base, enables;