patch-2.4.0-test3 linux/drivers/acpi/hardware/hwacpi.c

• Lines: 208
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/hardware/hwacpi.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/hardware/hwacpi.c linux/drivers/acpi/hardware/hwacpi.c
@@ -0,0 +1,207 @@
+
+/******************************************************************************
+ *
+ * Module Name: hwacpi - ACPI hardware functions - mode and timer
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 R. Byron Moore
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include "acpi.h"
+#include "hardware.h"
+
+
+#define _COMPONENT          HARDWARE
+	 MODULE_NAME         ("hwacpi");
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_set_mode
+ *
+ * PARAMETERS:  Mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Transitions the system into the requested mode or does nothing
+ *              if the system is already in that mode.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_hw_set_mode (
+	u32                     mode)
+{
+
+	ACPI_STATUS             status = AE_ERROR;
+
+
+	if (mode == SYS_MODE_ACPI) {
+		/* BIOS should have disabled ALL fixed and GP events */
+
+		acpi_os_out8 (acpi_gbl_FACP->smi_cmd, acpi_gbl_FACP->acpi_enable);
+	}
+
+	else if (mode == SYS_MODE_LEGACY) {
+		/*
+		 * BIOS should clear all fixed status bits and restore fixed event
+		 * enable bits to default
+		 */
+
+		acpi_os_out8 (acpi_gbl_FACP->smi_cmd, acpi_gbl_FACP->acpi_disable);
+	}
+
+	if (acpi_hw_get_mode () == mode) {
+		status = AE_OK;
+	}
+
+	return (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw
+
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
+ *
+ * DESCRIPTION: Return current operating state of system.  Determined by
+ *              querying the SCI_EN bit.
+ *
+ ******************************************************************************/
+
+u32
+acpi_hw_get_mode (void)
+{
+
+
+	if (acpi_hw_register_access (ACPI_READ, ACPI_MTX_LOCK, (s32)SCI_EN)) {
+		return (SYS_MODE_ACPI);
+	}
+	else {
+		return (SYS_MODE_LEGACY);
+	}
+}
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_get_mode_capabilities
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial
+ *              system state.
+ *
+ * DESCRIPTION: Returns capablities of system
+ *
+ ******************************************************************************/
+
+u32
+acpi_hw_get_mode_capabilities (void)
+{
+
+
+	if (!(acpi_gbl_system_flags & SYS_MODES_MASK)) {
+		if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
+			/*
+			 * Assume that if this call is being made, Acpi_init has been called
+			 * and ACPI support has been established by the presence of the
+			 * tables.  Therefore since we're in SYS_MODE_LEGACY, the system
+			 * must support both modes
+			 */
+
+			acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
+		}
+
+		else {
+			/* TBD: [Investigate] !!! this may be unsafe... */
+			/*
+			 * system is is ACPI mode, so try to switch back to LEGACY to see if
+			 * it is supported
+			 */
+			acpi_hw_set_mode (SYS_MODE_LEGACY);
+
+			if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
+				/* Now in SYS_MODE_LEGACY, so both are supported */
+
+				acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
+				acpi_hw_set_mode (SYS_MODE_ACPI);
+			}
+
+			else {
+				/* Still in SYS_MODE_ACPI so this must be an ACPI only system */
+
+				acpi_gbl_system_flags |= SYS_MODE_ACPI;
+			}
+		}
+	}
+
+	return (acpi_gbl_system_flags & SYS_MODES_MASK);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_pmt_ticks
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      Current value of the ACPI PMT (timer)
+ *
+ * DESCRIPTION: Obtains current value of ACPI PMT
+ *
+ ******************************************************************************/
+
+u32
+acpi_hw_pmt_ticks (void)
+{
+	u32                      ticks;
+
+	ticks = acpi_os_in32 (acpi_gbl_FACP->pm_tmr_blk);
+
+	return (ticks);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_hw_pmt_resolution
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      Number of bits of resolution in the PMT (either 24 or 32)
+ *
+ * DESCRIPTION: Obtains resolution of the ACPI PMT (either 24bit or 32bit)
+ *
+ ******************************************************************************/
+
+u32
+acpi_hw_pmt_resolution (void)
+{
+	if (0 == acpi_gbl_FACP->tmr_val_ext) {
+		return (24);
+	}
+
+	return (32);
+}
+