ps3-sys-manager.c

linux 内核源代码

/*
 *  PS3 System Manager.
 *
 *  Copyright (C) 2007 Sony Computer Entertainment Inc.
 *  Copyright 2007 Sony Corp.
 *
 *  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; version 2 of the License.
 *
 *  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 <linux/kernel.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>

#include <asm/firmware.h>
#include <asm/ps3.h>

#include "vuart.h"

MODULE_AUTHOR("Sony Corporation");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PS3 System Manager");

/**
 * ps3_sys_manager - PS3 system manager driver.
 *
 * The system manager provides an asynchronous system event notification
 * mechanism for reporting events like thermal alert and button presses to
 * guests.  It also provides support to control system shutdown and startup.
 *
 * The actual system manager is implemented as an application running in the
 * system policy module in lpar_1.  Guests communicate with the system manager
 * through port 2 of the vuart using a simple packet message protocol.
 * Messages are comprised of a fixed field header followed by a message
 * specific payload.
 */

/**
 * struct ps3_sys_manager_header - System manager message header.
 * @version: Header version, currently 1.
 * @size: Header size in bytes, curently 16.
 * @payload_size: Message payload size in bytes.
 * @service_id: Message type, one of enum ps3_sys_manager_service_id.
 * @request_tag: Unique number to identify reply.
 */

struct ps3_sys_manager_header {
	/* version 1 */
	u8 version;
	u8 size;
	u16 reserved_1;
	u32 payload_size;
	u16 service_id;
	u16 reserved_2;
	u32 request_tag;
};

#define dump_sm_header(_h) _dump_sm_header(_h, __func__, __LINE__)
static void __maybe_unused _dump_sm_header(
	const struct ps3_sys_manager_header *h, const char *func, int line)
{
	pr_debug("%s:%d: version:      %xh\n", func, line, h->version);
	pr_debug("%s:%d: size:         %xh\n", func, line, h->size);
	pr_debug("%s:%d: payload_size: %xh\n", func, line, h->payload_size);
	pr_debug("%s:%d: service_id:   %xh\n", func, line, h->service_id);
	pr_debug("%s:%d: request_tag:  %xh\n", func, line, h->request_tag);
}

/**
 * @PS3_SM_RX_MSG_LEN_MIN - Shortest received message length.
 * @PS3_SM_RX_MSG_LEN_MAX - Longest received message length.
 *
 * Currently all messages received from the system manager are either
 * (16 bytes header + 8 bytes payload = 24 bytes) or (16 bytes header
 * + 16 bytes payload = 32 bytes).  This knowlege is used to simplify
 * the logic.
 */

enum {
	PS3_SM_RX_MSG_LEN_MIN = 24,
	PS3_SM_RX_MSG_LEN_MAX = 32,
};

/**
 * enum ps3_sys_manager_service_id - Message header service_id.
 * @PS3_SM_SERVICE_ID_REQUEST:       guest --> sys_manager.
 * @PS3_SM_SERVICE_ID_REQUEST_ERROR: guest <-- sys_manager.
 * @PS3_SM_SERVICE_ID_COMMAND:       guest <-- sys_manager.
 * @PS3_SM_SERVICE_ID_RESPONSE:      guest --> sys_manager.
 * @PS3_SM_SERVICE_ID_SET_ATTR:      guest --> sys_manager.
 * @PS3_SM_SERVICE_ID_EXTERN_EVENT:  guest <-- sys_manager.
 * @PS3_SM_SERVICE_ID_SET_NEXT_OP:   guest --> sys_manager.
 *
 * PS3_SM_SERVICE_ID_REQUEST_ERROR is returned for invalid data values in a
 * a PS3_SM_SERVICE_ID_REQUEST message.  It also seems to be returned when
 * a REQUEST message is sent at the wrong time.
 */

enum ps3_sys_manager_service_id {
	/* version 1 */
	PS3_SM_SERVICE_ID_REQUEST = 1,
	PS3_SM_SERVICE_ID_RESPONSE = 2,
	PS3_SM_SERVICE_ID_COMMAND = 3,
	PS3_SM_SERVICE_ID_EXTERN_EVENT = 4,
	PS3_SM_SERVICE_ID_SET_NEXT_OP = 5,
	PS3_SM_SERVICE_ID_REQUEST_ERROR = 6,
	PS3_SM_SERVICE_ID_SET_ATTR = 8,
};

/**
 * enum ps3_sys_manager_attr - Notification attribute (bit position mask).
 * @PS3_SM_ATTR_POWER: Power button.
 * @PS3_SM_ATTR_RESET: Reset button, not available on retail console.
 * @PS3_SM_ATTR_THERMAL: Sytem thermal alert.
 * @PS3_SM_ATTR_CONTROLLER: Remote controller event.
 * @PS3_SM_ATTR_ALL: Logical OR of all.
 *
 * The guest tells the system manager which events it is interested in receiving
 * notice of by sending the system manager a logical OR of notification
 * attributes via the ps3_sys_manager_send_attr() routine.
 */

enum ps3_sys_manager_attr {
	/* version 1 */
	PS3_SM_ATTR_POWER = 1,
	PS3_SM_ATTR_RESET = 2,
	PS3_SM_ATTR_THERMAL = 4,
	PS3_SM_ATTR_CONTROLLER = 8, /* bogus? */
	PS3_SM_ATTR_ALL = 0x0f,
};

/**
 * enum ps3_sys_manager_event - External event type, reported by system manager.
 * @PS3_SM_EVENT_POWER_PRESSED: payload.value not used.
 * @PS3_SM_EVENT_POWER_RELEASED: payload.value = time pressed in millisec.
 * @PS3_SM_EVENT_RESET_PRESSED: payload.value not used.
 * @PS3_SM_EVENT_RESET_RELEASED: payload.value = time pressed in millisec.
 * @PS3_SM_EVENT_THERMAL_ALERT: payload.value = thermal zone id.
 * @PS3_SM_EVENT_THERMAL_CLEARED: payload.value = thermal zone id.
 */

enum ps3_sys_manager_event {
	/* version 1 */
	PS3_SM_EVENT_POWER_PRESSED = 3,
	PS3_SM_EVENT_POWER_RELEASED = 4,
	PS3_SM_EVENT_RESET_PRESSED = 5,
	PS3_SM_EVENT_RESET_RELEASED = 6,
	PS3_SM_EVENT_THERMAL_ALERT = 7,
	PS3_SM_EVENT_THERMAL_CLEARED = 8,
	/* no info on controller events */
};

/**
 * enum ps3_sys_manager_next_op - Operation to perform after lpar is destroyed.
 */

enum ps3_sys_manager_next_op {
	/* version 3 */
	PS3_SM_NEXT_OP_SYS_SHUTDOWN = 1,
	PS3_SM_NEXT_OP_SYS_REBOOT = 2,
	PS3_SM_NEXT_OP_LPAR_REBOOT = 0x82,
};

/**
 * enum ps3_sys_manager_wake_source - Next-op wakeup source (bit position mask).
 * @PS3_SM_WAKE_DEFAULT: Disk insert, power button, eject button, IR
 * controller, and bluetooth controller.
 * @PS3_SM_WAKE_RTC:
 * @PS3_SM_WAKE_RTC_ERROR:
 * @PS3_SM_WAKE_P_O_R: Power on reset.
 *
 * Additional wakeup sources when specifying PS3_SM_NEXT_OP_SYS_SHUTDOWN.
 * System will always wake from the PS3_SM_WAKE_DEFAULT sources.
 */

enum ps3_sys_manager_wake_source {
	/* version 3 */
	PS3_SM_WAKE_DEFAULT   = 0,
	PS3_SM_WAKE_RTC       = 0x00000040,
	PS3_SM_WAKE_RTC_ERROR = 0x00000080,
	PS3_SM_WAKE_P_O_R     = 0x10000000,
};

/**
 * enum ps3_sys_manager_cmd - Command from system manager to guest.
 *
 * The guest completes the actions needed, then acks or naks the command via
 * ps3_sys_manager_send_response().  In the case of @PS3_SM_CMD_SHUTDOWN,
 * the guest must be fully prepared for a system poweroff prior to acking the
 * command.
 */

enum ps3_sys_manager_cmd {
	/* version 1 */
	PS3_SM_CMD_SHUTDOWN = 1, /* shutdown guest OS */
};

/**
 * ps3_sm_force_power_off - Poweroff helper.
 *
 * A global variable used to force a poweroff when the power button has
 * been pressed irrespective of how init handles the ctrl_alt_del signal.
 *
 */

static unsigned int ps3_sm_force_power_off;

/**
 * ps3_sys_manager_write - Helper to write a two part message to the vuart.
 *
 */

static int ps3_sys_manager_write(struct ps3_system_bus_device *dev,
	const struct ps3_sys_manager_header *header, const void *payload)
{
	int result;

	BUG_ON(header->version != 1);
	BUG_ON(header->size != 16);
	BUG_ON(header->payload_size != 8 && header->payload_size != 16);
	BUG_ON(header->service_id > 8);

	result = ps3_vuart_write(dev, header,
		sizeof(struct ps3_sys_manager_header));

	if (!result)
		result = ps3_vuart_write(dev, payload, header->payload_size);

	return result;
}

/**
 * ps3_sys_manager_send_attr - Send a 'set attribute' to the system manager.
 *
 */

static int ps3_sys_manager_send_attr(struct ps3_system_bus_device *dev,
	enum ps3_sys_manager_attr attr)
{
	struct ps3_sys_manager_header header;
	struct {
		u8 version;
		u8 reserved_1[3];
		u32 attribute;
	} payload;

	BUILD_BUG_ON(sizeof(payload) != 8);

	dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, attr);

	memset(&header, 0, sizeof(header));
	header.version = 1;
	header.size = 16;
	header.payload_size = 16;
	header.service_id = PS3_SM_SERVICE_ID_SET_ATTR;

	memset(&payload, 0, sizeof(payload));
	payload.version = 1;
	payload.attribute = attr;

	return ps3_sys_manager_write(dev, &header, &payload);
}

/**
 * ps3_sys_manager_send_next_op - Send a 'set next op' to the system manager.
 *
 * Tell the system manager what to do after this lpar is destroyed.
 */

static int ps3_sys_manager_send_next_op(struct ps3_system_bus_device *dev,
	enum ps3_sys_manager_next_op op,
	enum ps3_sys_manager_wake_source wake_source)
{
	struct ps3_sys_manager_header header;
	struct {
		u8 version;
		u8 type;
		u8 gos_id;
		u8 reserved_1;
		u32 wake_source;
		u8 reserved_2[8];
	} payload;

	BUILD_BUG_ON(sizeof(payload) != 16);

	dev_dbg(&dev->core, "%s:%d: (%xh)\n", __func__, __LINE__, op);

	memset(&header, 0, sizeof(header));
	header.version = 1;
	header.size = 16;
	header.payload_size = 16;
	header.service_id = PS3_SM_SERVICE_ID_SET_NEXT_OP;

	memset(&payload, 0, sizeof(payload));
	payload.version = 3;
	payload.type = op;
	payload.gos_id = 3; /* other os */
	payload.wake_source = wake_source;

	return ps3_sys_manager_write(dev, &header, &payload);
}

/**
 * ps3_sys_manager_send_request_shutdown - Send 'request' to the system manager.
 *
 * The guest sends this message to request an operation or action of the system
 * manager.  The reply is a command message from the system manager.  In the
 * command handler the guest performs the requested operation.  The result of
 * the command is then communicated back to the system manager with a response
 * message.
 *
 * Currently, the only supported request is the 'shutdown self' request.
 */

static int ps3_sys_manager_send_request_shutdown(
	struct ps3_system_bus_device *dev)
{
	struct ps3_sys_manager_header header;
	struct {
		u8 version;
		u8 type;
		u8 gos_id;
		u8 reserved_1[13];
	} payload;

	BUILD_BUG_ON(sizeof(payload) != 16);

	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);

	memset(&header, 0, sizeof(header));
	header.version = 1;
	header.size = 16;
	header.payload_size = 16;
	header.service_id = PS3_SM_SERVICE_ID_REQUEST;

	memset(&payload, 0, sizeof(payload));
	payload.version = 1;
	payload.type = 1; /* shutdown */
	payload.gos_id = 0; /* self */

	return ps3_sys_manager_write(dev, &header, &payload);