ps3-vuart.c

linux 内核源代码

/*
 *  PS3 virtual uart
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 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/interrupt.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <asm/ps3.h>

#include <asm/firmware.h>
#include <asm/lv1call.h>

#include "vuart.h"

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

/**
 * vuart - An inter-partition data link service.
 *  port 0: PS3 AV Settings.
 *  port 2: PS3 System Manager.
 *
 * The vuart provides a bi-directional byte stream data link between logical
 * partitions.  Its primary role is as a communications link between the guest
 * OS and the system policy module.  The current HV does not support any
 * connections other than those listed.
 */

enum {PORT_COUNT = 3,};

enum vuart_param {
	PARAM_TX_TRIGGER = 0,
	PARAM_RX_TRIGGER = 1,
	PARAM_INTERRUPT_MASK = 2,
	PARAM_RX_BUF_SIZE = 3, /* read only */
	PARAM_RX_BYTES = 4, /* read only */
	PARAM_TX_BUF_SIZE = 5, /* read only */
	PARAM_TX_BYTES = 6, /* read only */
	PARAM_INTERRUPT_STATUS = 7, /* read only */
};

enum vuart_interrupt_bit {
	INTERRUPT_BIT_TX = 0,
	INTERRUPT_BIT_RX = 1,
	INTERRUPT_BIT_DISCONNECT = 2,
};

enum vuart_interrupt_mask {
	INTERRUPT_MASK_TX = 1,
	INTERRUPT_MASK_RX = 2,
	INTERRUPT_MASK_DISCONNECT = 4,
};

/**
 * struct ps3_vuart_port_priv - private vuart device data.
 */

struct ps3_vuart_port_priv {
	u64 interrupt_mask;

	struct {
		spinlock_t lock;
		struct list_head head;
	} tx_list;
	struct {
		struct ps3_vuart_work work;
		unsigned long bytes_held;
		spinlock_t lock;
		struct list_head head;
	} rx_list;
	struct ps3_vuart_stats stats;
};

static struct ps3_vuart_port_priv *to_port_priv(
	struct ps3_system_bus_device *dev)
{
	BUG_ON(!dev);
	BUG_ON(!dev->driver_priv);
	return (struct ps3_vuart_port_priv *)dev->driver_priv;
}

/**
 * struct ports_bmp - bitmap indicating ports needing service.
 *
 * A 256 bit read only bitmap indicating ports needing service.  Do not write
 * to these bits.  Must not cross a page boundary.
 */

struct ports_bmp {
	u64 status;
	u64 unused[3];
} __attribute__ ((aligned (32)));

#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
static void __maybe_unused _dump_ports_bmp(
	const struct ports_bmp* bmp, const char* func, int line)
{
	pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
}

#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
static void __maybe_unused _dump_port_params(unsigned int port_number,
	const char* func, int line)
{
#if defined(DEBUG)
	static const char *strings[] = {
		"tx_trigger      ",
		"rx_trigger      ",
		"interrupt_mask  ",
		"rx_buf_size     ",
		"rx_bytes        ",
		"tx_buf_size     ",
		"tx_bytes        ",
		"interrupt_status",
	};
	int result;
	unsigned int i;
	u64 value;

	for (i = 0; i < ARRAY_SIZE(strings); i++) {
		result = lv1_get_virtual_uart_param(port_number, i, &value);

		if (result) {
			pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
				port_number, strings[i], ps3_result(result));
			continue;
		}
		pr_debug("%s:%d: port_%u: %s = %lxh\n",
			func, line, port_number, strings[i], value);
	}
#endif
}

struct vuart_triggers {
	unsigned long rx;
	unsigned long tx;
};

int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
	struct vuart_triggers *trig)
{
	int result;
	unsigned long size;
	unsigned long val;

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_TX_TRIGGER, &trig->tx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BUF_SIZE, &size);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_TRIGGER, &val);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	trig->rx = size - val;

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

	return result;
}

int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
	unsigned int rx)
{
	int result;
	unsigned long size;

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_TX_TRIGGER, tx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BUF_SIZE, &size);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_RX_TRIGGER, size - rx);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

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

	return result;
}

static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
	u64 *bytes_waiting)
{
	int result;

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_RX_BYTES, bytes_waiting);

	if (result)
		dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
		*bytes_waiting);
	return result;
}

/**
 * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
 * @dev: The struct ps3_system_bus_device instance.
 * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
 */

static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
	unsigned long mask)
{
	int result;
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

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

	priv->interrupt_mask = mask;

	result = lv1_set_virtual_uart_param(dev->port_number,
		PARAM_INTERRUPT_MASK, priv->interrupt_mask);

	if (result)
		dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	return result;
}

static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
	unsigned long *status)
{
	int result;
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
	u64 tmp;

	result = lv1_get_virtual_uart_param(dev->port_number,
		PARAM_INTERRUPT_STATUS, &tmp);

	if (result)
		dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
			__func__, __LINE__, ps3_result(result));

	*status = tmp & priv->interrupt_mask;

	dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
		__func__, __LINE__, priv->interrupt_mask, tmp, *status);

	return result;
}

int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		| INTERRUPT_MASK_TX);
}

int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		| INTERRUPT_MASK_RX);
}

int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		| INTERRUPT_MASK_DISCONNECT);
}

int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_TX)
		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		& ~INTERRUPT_MASK_TX) : 0;
}

int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_RX)
		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		& ~INTERRUPT_MASK_RX) : 0;
}

int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
{
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
		& ~INTERRUPT_MASK_DISCONNECT) : 0;
}

/**
 * ps3_vuart_raw_write - Low level write helper.
 * @dev: The struct ps3_system_bus_device instance.
 *
 * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
 */

static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
	const void* buf, unsigned int bytes, unsigned long *bytes_written)
{
	int result;
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

	result = lv1_write_virtual_uart(dev->port_number,
		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
			"%s\n", __func__, __LINE__, ps3_result(result));
		return result;
	}

	priv->stats.bytes_written += *bytes_written;

	dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
		*bytes_written, bytes, priv->stats.bytes_written);

	return result;
}

/**
 * ps3_vuart_raw_read - Low level read helper.
 * @dev: The struct ps3_system_bus_device instance.
 *
 * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
 */

static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
	unsigned int bytes, unsigned long *bytes_read)
{
	int result;
	struct ps3_vuart_port_priv *priv = to_port_priv(dev);

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

	result = lv1_read_virtual_uart(dev->port_number,
		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);

	if (result) {
		dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
			__func__, __LINE__, ps3_result(result));
		return result;
	}

	priv->stats.bytes_read += *bytes_read;

	dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
		*bytes_read, bytes, priv->stats.bytes_read);

	return result;
}

/**
 * ps3_vuart_clear_rx_bytes - Discard bytes received.
 * @dev: The struct ps3_system_bus_device instance.
 * @bytes: Max byte count to discard, zero = all pending.
 *