Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 306 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
new file mode 100644
index 000000000..6368ff544
--- /dev/null
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the
+ *                   original/legacy sleep/PM registers.
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_HARDWARE
+ACPI_MODULE_NAME("hwsleep")
+
+#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_legacy_sleep
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state to enter
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
+ *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
+ *
+ ******************************************************************************/
+acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
+{
+	struct acpi_bit_register_info *sleep_type_reg_info;
+	struct acpi_bit_register_info *sleep_enable_reg_info;
+	u32 pm1a_control;
+	u32 pm1b_control;
+	u32 in_value;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(hw_legacy_sleep);
+
+	sleep_type_reg_info =
+	    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
+	sleep_enable_reg_info =
+	    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
+
+	/* Clear wake status */
+
+	status = acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
+					 ACPI_CLEAR_STATUS);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Disable all GPEs */
+	status = acpi_hw_disable_all_gpes();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+	status = acpi_hw_clear_acpi_status();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+	acpi_gbl_system_awake_and_running = FALSE;
+
+	 /* Enable all wakeup GPEs */
+	status = acpi_hw_enable_all_wakeup_gpes();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Get current value of PM1A control */
+
+	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
+				       &pm1a_control);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+	ACPI_DEBUG_PRINT((ACPI_DB_INIT,
+			  "Entering sleep state [S%u]\n", sleep_state));
+
+	/* Clear the SLP_EN and SLP_TYP fields */
+
+	pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
+			  sleep_enable_reg_info->access_bit_mask);
+	pm1b_control = pm1a_control;
+
+	/* Insert the SLP_TYP bits */
+
+	pm1a_control |=
+	    (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
+	pm1b_control |=
+	    (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
+
+	/*
+	 * We split the writes of SLP_TYP and SLP_EN to workaround
+	 * poorly implemented hardware.
+	 */
+
+	/* Write #1: write the SLP_TYP data to the PM1 Control registers */
+
+	status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Insert the sleep enable (SLP_EN) bit */
+
+	pm1a_control |= sleep_enable_reg_info->access_bit_mask;
+	pm1b_control |= sleep_enable_reg_info->access_bit_mask;
+
+	/* Flush caches, as per ACPI specification */
+
+	if (sleep_state < ACPI_STATE_S4) {
+		ACPI_FLUSH_CPU_CACHE();
+	}
+
+	status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control);
+	if (status == AE_CTRL_TERMINATE) {
+		return_ACPI_STATUS(AE_OK);
+	}
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Write #2: Write both SLP_TYP + SLP_EN */
+
+	status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (sleep_state > ACPI_STATE_S3) {
+		/*
+		 * We wanted to sleep > S3, but it didn't happen (by virtue of the
+		 * fact that we are still executing!)
+		 *
+		 * Wait ten seconds, then try again. This is to get S4/S5 to work on
+		 * all machines.
+		 *
+		 * We wait so long to allow chipsets that poll this reg very slowly
+		 * to still read the right value. Ideally, this block would go
+		 * away entirely.
+		 */
+		acpi_os_stall(10 * ACPI_USEC_PER_SEC);
+
+		status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
+						sleep_enable_reg_info->
+						access_bit_mask);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	}
+
+	/* Wait for transition back to Working State */
+
+	do {
+		status =
+		    acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+	} while (!in_value);
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_legacy_wake_prep
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
+ *              sleep.
+ *              Called with interrupts ENABLED.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state)
+{
+	acpi_status status = AE_OK;
+	struct acpi_bit_register_info *sleep_type_reg_info;
+	struct acpi_bit_register_info *sleep_enable_reg_info;
+	u32 pm1a_control;
+	u32 pm1b_control;
+
+	ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);
+
+	/*
+	 * Set SLP_TYPE and SLP_EN to state S0.
+	 * This is unclear from the ACPI Spec, but it is required
+	 * by some machines.
+	 */
+	if (acpi_gbl_sleep_type_a_s0 != ACPI_SLEEP_TYPE_INVALID) {
+		sleep_type_reg_info =
+		    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
+		sleep_enable_reg_info =
+		    acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
+
+		/* Get current value of PM1A control */
+
+		status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
+					       &pm1a_control);
+		if (ACPI_SUCCESS(status)) {
+
+			/* Clear the SLP_EN and SLP_TYP fields */
+
+			pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
+					  sleep_enable_reg_info->
+					  access_bit_mask);
+			pm1b_control = pm1a_control;
+
+			/* Insert the SLP_TYP bits */
+
+			pm1a_control |= (acpi_gbl_sleep_type_a_s0 <<
+					 sleep_type_reg_info->bit_position);
+			pm1b_control |= (acpi_gbl_sleep_type_b_s0 <<
+					 sleep_type_reg_info->bit_position);
+
+			/* Write the control registers and ignore any errors */
+
+			(void)acpi_hw_write_pm1_control(pm1a_control,
+							pm1b_control);
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_legacy_wake
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
+ *              Called with interrupts ENABLED.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_hw_legacy_wake(u8 sleep_state)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(hw_legacy_wake);
+
+	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
+
+	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
+	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
+
+	/*
+	 * GPEs must be enabled before _WAK is called as GPEs
+	 * might get fired there
+	 *
+	 * Restore the GPEs:
+	 * 1) Disable all GPEs
+	 * 2) Enable all runtime GPEs
+	 */
+	status = acpi_hw_disable_all_gpes();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	status = acpi_hw_enable_all_runtime_gpes();
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/*
+	 * Now we can execute _WAK, etc. Some machines require that the GPEs
+	 * are enabled before the wake methods are executed.
+	 */
+	acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
+
+	/*
+	 * Some BIOS code assumes that WAK_STS will be cleared on resume
+	 * and use it to determine whether the system is rebooting or
+	 * resuming. Clear WAK_STS for compatibility.
+	 */
+	(void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
+				      ACPI_CLEAR_STATUS);
+	acpi_gbl_system_awake_and_running = TRUE;
+
+	/* Enable power button */
+
+	(void)
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info
+				    [ACPI_EVENT_POWER_BUTTON].
+				    enable_register_id, ACPI_ENABLE_EVENT);
+
+	(void)
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info
+				    [ACPI_EVENT_POWER_BUTTON].
+				    status_register_id, ACPI_CLEAR_STATUS);
+
+	acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
+	return_ACPI_STATUS(status);
+}
+
+#endif				/* !ACPI_REDUCED_HARDWARE */