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-rw-r--r--src/soc/intel/common/block/include/intelblocks/lpss.h10
-rw-r--r--src/soc/intel/common/block/lpss/lpss.c18
2 files changed, 28 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/lpss.h b/src/soc/intel/common/block/include/intelblocks/lpss.h
index eb38f13a71..dafe351f02 100644
--- a/src/soc/intel/common/block/include/intelblocks/lpss.h
+++ b/src/soc/intel/common/block/include/intelblocks/lpss.h
@@ -16,8 +16,15 @@
#ifndef SOC_INTEL_COMMON_BLOCK_LPSS_H
#define SOC_INTEL_COMMON_BLOCK_LPSS_H
+#include <device/device.h>
#include <stdint.h>
+/* D0 and D3 enable config */
+enum lpss_pwr_state {
+ STATE_D0 = 0,
+ STATE_D3 = 3
+};
+
/* Gets controller out of reset */
void lpss_reset_release(uintptr_t base);
@@ -30,4 +37,7 @@ void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val);
/* Check if controller is in reset. */
bool lpss_is_controller_in_reset(uintptr_t base);
+/* Set controller power state to D0 or D3*/
+void lpss_set_power_state(const struct device *dev, enum lpss_pwr_state state);
+
#endif /* SOC_INTEL_COMMON_BLOCK_LPSS_H */
diff --git a/src/soc/intel/common/block/lpss/lpss.c b/src/soc/intel/common/block/lpss/lpss.c
index 6b6d17b106..226b4d30a8 100644
--- a/src/soc/intel/common/block/lpss/lpss.c
+++ b/src/soc/intel/common/block/lpss/lpss.c
@@ -14,6 +14,7 @@
*/
#include <device/mmio.h>
+#include <device/pci_ops.h>
#include <intelblocks/lpss.h>
/* Clock register */
@@ -39,6 +40,11 @@
/* DMA Software Reset Control */
#define LPSS_DMA_RST_RELEASE (1 << 2)
+/* Power management control and status register */
+#define PME_CTRL_STATUS 0x84
+/* Bit 1:0 Powerstate, controls D0 and D3 state */
+#define POWER_STATE_MASK 3
+
bool lpss_is_controller_in_reset(uintptr_t base)
{
uint8_t *addr = (void *)base;
@@ -69,3 +75,15 @@ void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val)
write32(addr, clk_sel);
}
+
+/* Set controller power state to D0 or D3 */
+void lpss_set_power_state(const struct device *dev, enum lpss_pwr_state state)
+{
+#if defined(__SIMPLE_DEVICE__)
+ pci_devfn_t lpss_dev = dev->path.pci.devfn;
+#else
+ const struct device *lpss_dev = dev;
+#endif
+
+ pci_update_config8(lpss_dev, PME_CTRL_STATUS, ~POWER_STATE_MASK, state);
+}