- 根目录:
- drivers
- ps3
- ps3-vuart.c
/*
* 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/slab.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: %016llxh\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;
u64 size;
u64 val;
u64 tx;
result = lv1_get_virtual_uart_param(dev->port_number,
PARAM_TX_TRIGGER, &tx);
trig->tx = 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;
u64 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: %llxh\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 %llxh, s %llxh, 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, u64 *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 %llxh/%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, u64 *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 %llxh/%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.
*
* Used to clear pending rx interrupt source. Will not block.
*/
void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
unsigned int bytes)
{
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
u64 bytes_waiting;
void *tmp;
result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
BUG_ON(result);
bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
if (!bytes)
return;
/* Add some extra space for recently arrived data. */
bytes += 128;
tmp = kmalloc(bytes, GFP_KERNEL);
if (!tmp)
return;
ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
kfree(tmp);
/* Don't include these bytes in the stats. */
priv->stats.bytes_read -= bytes_waiting;
}
EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
/**
* struct list_buffer - An element for a port device fifo buffer list.
*/
struct list_buffer {
struct list_head link;
const unsigned char *head;
const unsigned char *tail;
unsigned long dbg_number;
unsigned char data[];
};
/**
* ps3_vuart_write - the entry point for writing data to a port
* @dev: The struct ps3_system_bus_device instance.
*
* If the port is idle on entry as much of the incoming data is written to
* the port as the port will accept. Otherwise a list buffer is created
* and any remaning incoming data is copied to that buffer. The buffer is
* then enqueued for transmision via the transmit interrupt.
*/
int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
unsigned int bytes)
{
static unsigned long dbg_number;
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long flags;
struct list_buffer *lb;
dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
bytes, bytes);
spin_lock_irqsave(&priv->tx_list.lock, flags);
if (list_empty(&priv->tx_list.head)) {
u64 bytes_written;
result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
spin_unlock_irqrestore(&priv->tx_list.lock, flags);
if (result) {
dev_dbg(&dev->core,
"%s:%d: ps3_vuart_raw_write failed\n",
__func__, __LINE__);
return result;
}
if (bytes_written == bytes) {
dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
__func__, __LINE__, bytes);
return 0;
}
bytes -= bytes_written;
buf += bytes_written;
} else
spin_unlock_irqrestore(&priv->tx_list.lock, flags);
lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
if (!lb)
return -ENOMEM;
memcpy(lb->data, buf, bytes);
lb->head = lb->data;
lb->tail = lb->data + bytes;
lb->dbg_number = ++dbg_number;
spin_lock_irqsave(&priv->tx_list.lock, flags);
list_add_tail(&lb->link, &priv->tx_list.head);
ps3_vuart_enable_interrupt_tx(dev);
spin_unlock_irqrestore(&priv->tx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes);
return 0;
}
EXPORT_SYMBOL_GPL(ps3_vuart_write);
/**
* ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
* @dev: The struct ps3_system_bus_device instance.
* @bytes_queued: Number of bytes queued to the buffer list.
*
* Must be called with priv->rx_list.lock held.
*/
static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
u64 *bytes_queued)
{
static unsigned long dbg_number;
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
struct list_buffer *lb;
u64 bytes;
*bytes_queued = 0;
result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
BUG_ON(result);
if (result)
return -EIO;
if (!bytes)
return 0;
/* Add some extra space for recently arrived data. */
bytes += 128;
lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
if (!lb)
return -ENOMEM;
ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
lb->head = lb->data;
lb->tail = lb->data + bytes;
lb->dbg_number = ++dbg_number;
list_add_tail(&lb->link, &priv->rx_list.head);
priv->rx_list.bytes_held += bytes;
dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %llxh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes);
*bytes_queued = bytes;
return 0;
}
/**
* ps3_vuart_read - The entry point for reading data from a port.
*
* Queue data waiting at the port, and if enough bytes to satisfy the request
* are held in the buffer list those bytes are dequeued and copied to the
* caller's buffer. Emptied list buffers are retiered. If the request cannot
* be statified by bytes held in the list buffers -EAGAIN is returned.
*/
int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
unsigned int bytes)
{
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long flags;
struct list_buffer *lb, *n;
unsigned long bytes_read;
dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
bytes, bytes);
spin_lock_irqsave(&priv->rx_list.lock, flags);
/* Queue rx bytes here for polled reads. */
while (priv->rx_list.bytes_held < bytes) {
u64 tmp;
result = ps3_vuart_queue_rx_bytes(dev, &tmp);
if (result || !tmp) {
dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
__func__, __LINE__,
bytes - priv->rx_list.bytes_held);
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return -EAGAIN;
}
}
list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
memcpy(buf, lb->head, bytes_read);
buf += bytes_read;
bytes -= bytes_read;
priv->rx_list.bytes_held -= bytes_read;
if (bytes_read < lb->tail - lb->head) {
lb->head += bytes_read;
dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
"bytes\n", __func__, __LINE__, lb->dbg_number,
bytes_read);
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return 0;
}
dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
"bytes\n", __func__, __LINE__, lb->dbg_number,
bytes_read);
list_del(&lb->link);
kfree(lb);
}
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ps3_vuart_read);
/**
* ps3_vuart_work - Asynchronous read handler.
*/
static void ps3_vuart_work(struct work_struct *work)
{
struct ps3_system_bus_device *dev =
ps3_vuart_work_to_system_bus_dev(work);
struct ps3_vuart_port_driver *drv =
ps3_system_bus_dev_to_vuart_drv(dev);
BUG_ON(!drv);
drv->work(dev);
}
int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
{
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long flags;
if (priv->rx_list.work.trigger) {
dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
__func__, __LINE__);
return -EAGAIN;
}
BUG_ON(!bytes);
PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work);
spin_lock_irqsave(&priv->rx_list.lock, flags);
if (priv->rx_list.bytes_held >= bytes) {
dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
__func__, __LINE__, bytes);
schedule_work(&priv->rx_list.work.work);
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return 0;
}
priv->rx_list.work.trigger = bytes;
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
__LINE__, bytes, bytes);
return 0;
}
EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
{
to_port_priv(dev)->rx_list.work.trigger = 0;
}
EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
/**
* ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
*
* Services the transmit interrupt for the port. Writes as much data from the
* buffer list as the port will accept. Retires any emptied list buffers and
* adjusts the final list buffer state for a partial write.
*/
static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
{
int result = 0;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long flags;
struct list_buffer *lb, *n;
unsigned long bytes_total = 0;
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
spin_lock_irqsave(&priv->tx_list.lock, flags);
list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
u64 bytes_written;
result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
&bytes_written);
if (result) {
dev_dbg(&dev->core,
"%s:%d: ps3_vuart_raw_write failed\n",
__func__, __LINE__);
break;
}
bytes_total += bytes_written;
if (bytes_written < lb->tail - lb->head) {
lb->head += bytes_written;
dev_dbg(&dev->core,
"%s:%d cleared buf_%lu, %llxh bytes\n",
__func__, __LINE__, lb->dbg_number,
bytes_written);
goto port_full;
}
dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
lb->dbg_number);
list_del(&lb->link);
kfree(lb);
}
ps3_vuart_disable_interrupt_tx(dev);
port_full:
spin_unlock_irqrestore(&priv->tx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
__func__, __LINE__, bytes_total);
return result;
}
/**
* ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
*
* Services the receive interrupt for the port. Creates a list buffer and
* copies all waiting port data to that buffer and enqueues the buffer in the
* buffer list. Buffer list data is dequeued via ps3_vuart_read.
*/
static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
{
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long flags;
u64 bytes;
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
spin_lock_irqsave(&priv->rx_list.lock, flags);
result = ps3_vuart_queue_rx_bytes(dev, &bytes);
if (result) {
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return result;
}
if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
>= priv->rx_list.work.trigger) {
dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
__func__, __LINE__, priv->rx_list.work.trigger);
priv->rx_list.work.trigger = 0;
schedule_work(&priv->rx_list.work.work);
}
spin_unlock_irqrestore(&priv->rx_list.lock, flags);
return result;
}
static int ps3_vuart_handle_interrupt_disconnect(
struct ps3_system_bus_device *dev)
{
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
BUG_ON("no support");
return -1;
}
/**
* ps3_vuart_handle_port_interrupt - second stage interrupt handler
*
* Services any pending interrupt types for the port. Passes control to the
* third stage type specific interrupt handler. Returns control to the first
* stage handler after one iteration.
*/
static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
{
int result;
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
unsigned long status;
result = ps3_vuart_get_interrupt_status(dev, &status);
if (result)
return result;
dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
status);
if (status & INTERRUPT_MASK_DISCONNECT) {
priv->stats.disconnect_interrupts++;
result = ps3_vuart_handle_interrupt_disconnect(dev);
if (result)
ps3_vuart_disable_interrupt_disconnect(dev);
}
if (status & INTERRUPT_MASK_TX) {
priv->stats.tx_interrupts++;
result = ps3_vuart_handle_interrupt_tx(dev);
if (result)
ps3_vuart_disable_interrupt_tx(dev);
}
if (status & INTERRUPT_MASK_RX) {
priv->stats.rx_interrupts++;
result = ps3_vuart_handle_interrupt_rx(dev);
if (result)
ps3_vuart_disable_interrupt_rx(dev);
}
return 0;
}
struct vuart_bus_priv {
struct ports_bmp *bmp;
unsigned int virq;
struct mutex probe_mutex;
int use_count;
struct ps3_system_bus_device *devices[PORT_COUNT];
} static vuart_bus_priv;
/**
* ps3_vuart_irq_handler - first stage interrupt handler
*
* Loops finding any interrupting port and its associated instance data.
* Passes control to the second stage port specific interrupt handler. Loops
* until all outstanding interrupts are serviced.
*/
static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
{
struct vuart_bus_priv *bus_priv = _private;
BUG_ON(!bus_priv);
while (1) {
unsigned int port;
dump_ports_bmp(bus_priv->bmp);
port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
if (port == BITS_PER_LONG)
break;
BUG_ON(port >= PORT_COUNT);
BUG_ON(!bus_priv->devices[port]);
ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
}
return IRQ_HANDLED;
}
static int ps3_vuart_bus_interrupt_get(void)
{
int result;
pr_debug(" -> %s:%d\n", __func__, __LINE__);
vuart_bus_priv.use_count++;
BUG_ON(vuart_bus_priv.use_count > 2);
if (vuart_bus_priv.use_count != 1)
return 0;
BUG_ON(vuart_bus_priv.bmp);
vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL);
if (!vuart_bus_priv.bmp) {
pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__);
result = -ENOMEM;
goto fail_bmp_malloc;
}
result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp,
&vuart_bus_priv.virq);
if (result) {
pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n",
__func__, __LINE__, result);
result = -EPERM;
goto fail_alloc_irq;
}
result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
0, "vuart", &vuart_bus_priv);
if (result) {
pr_debug("%s:%d: request_irq failed (%d)\n",
__func__, __LINE__, result);
goto fail_request_irq;
}
pr_debug(" <- %s:%d: ok\n", __func__, __LINE__);
return result;
fail_request_irq:
ps3_vuart_irq_destroy(vuart_bus_priv.virq);
vuart_bus_priv.virq = NO_IRQ;
fail_alloc_irq:
kfree(vuart_bus_priv.bmp);
vuart_bus_priv.bmp = NULL;
fail_bmp_malloc:
vuart_bus_priv.use_count--;
pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
return result;
}
static int ps3_vuart_bus_interrupt_put(void)
{
pr_debug(" -> %s:%d\n", __func__, __LINE__);
vuart_bus_priv.use_count--;
BUG_ON(vuart_bus_priv.use_count < 0);
if (vuart_bus_priv.use_count != 0)
return 0;
free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
ps3_vuart_irq_destroy(vuart_bus_priv.virq);
vuart_bus_priv.virq = NO_IRQ;
kfree(vuart_bus_priv.bmp);
vuart_bus_priv.bmp = NULL;
pr_debug(" <- %s:%d\n", __func__, __LINE__);
return 0;
}
static int ps3_vuart_probe(struct ps3_system_bus_device *dev)
{
int result;
struct ps3_vuart_port_driver *drv;
struct ps3_vuart_port_priv *priv = NULL;
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
drv = ps3_system_bus_dev_to_vuart_drv(dev);
dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
drv->core.core.name);
BUG_ON(!drv);
if (dev->port_number >= PORT_COUNT) {
BUG();
return -EINVAL;
}
mutex_lock(&vuart_bus_priv.probe_mutex);
result = ps3_vuart_bus_interrupt_get();
if (result)
goto fail_setup_interrupt;
if (vuart_bus_priv.devices[dev->port_number]) {
dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
__LINE__, dev->port_number);
result = -EBUSY;
goto fail_busy;
}
vuart_bus_priv.devices[dev->port_number] = dev;
/* Setup dev->driver_priv. */
dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv),
GFP_KERNEL);
if (!dev->driver_priv) {
result = -ENOMEM;
goto fail_dev_malloc;
}
priv = to_port_priv(dev);
INIT_LIST_HEAD(&priv->tx_list.head);
spin_lock_init(&priv->tx_list.lock);
INIT_LIST_HEAD(&priv->rx_list.head);
spin_lock_init(&priv->rx_list.lock);
INIT_WORK(&priv->rx_list.work.work, NULL);
priv->rx_list.work.trigger = 0;
priv->rx_list.work.dev = dev;
/* clear stale pending interrupts */
ps3_vuart_clear_rx_bytes(dev, 0);
ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
ps3_vuart_set_triggers(dev, 1, 1);
if (drv->probe)
result = drv->probe(dev);
else {
result = 0;
dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
__LINE__);
}
if (result) {
dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
__func__, __LINE__);
goto fail_probe;
}
mutex_unlock(&vuart_bus_priv.probe_mutex);
return result;
fail_probe:
ps3_vuart_set_interrupt_mask(dev, 0);
kfree(dev->driver_priv);
dev->driver_priv = NULL;
fail_dev_malloc:
vuart_bus_priv.devices[dev->port_number] = NULL;
fail_busy:
ps3_vuart_bus_interrupt_put();
fail_setup_interrupt:
mutex_unlock(&vuart_bus_priv.probe_mutex);
dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__);
return result;
}
/**
* ps3_vuart_cleanup - common cleanup helper.
* @dev: The struct ps3_system_bus_device instance.
*
* Cleans interrupts and HV resources. Must be called with
* vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and
* ps3_vuart_shutdown. After this call, polled reading will still work.
*/
static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
{
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
ps3_vuart_cancel_async(dev);
ps3_vuart_set_interrupt_mask(dev, 0);
ps3_vuart_bus_interrupt_put();
return 0;
}
/**
* ps3_vuart_remove - Completely clean the device instance.
* @dev: The struct ps3_system_bus_device instance.
*
* Cleans all memory, interrupts and HV resources. After this call the
* device can no longer be used.
*/
static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
{
struct ps3_vuart_port_priv *priv = to_port_priv(dev);
struct ps3_vuart_port_driver *drv;
BUG_ON(!dev);
mutex_lock(&vuart_bus_priv.probe_mutex);
dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
dev->match_id);
if (!dev->core.driver) {
dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
__LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
}
drv = ps3_system_bus_dev_to_vuart_drv(dev);
BUG_ON(!drv);
if (drv->remove) {
drv->remove(dev);
} else {
dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__,
__LINE__);
BUG();
}
ps3_vuart_cleanup(dev);
vuart_bus_priv.devices[dev->port_number] = NULL;
kfree(priv);
priv = NULL;
dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
}
/**
* ps3_vuart_shutdown - Cleans interrupts and HV resources.
* @dev: The struct ps3_system_bus_device instance.
*
* Cleans interrupts and HV resources. After this call the
* device can still be used in polling mode. This behavior required
* by sys-manager to be able to complete the device power operation
* sequence.
*/
static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
{
struct ps3_vuart_port_driver *drv;
BUG_ON(!dev);
mutex_lock(&vuart_bus_priv.probe_mutex);
dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
dev->match_id);
if (!dev->core.driver) {
dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
__LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
}
drv = ps3_system_bus_dev_to_vuart_drv(dev);
BUG_ON(!drv);
if (drv->shutdown)
drv->shutdown(dev);
else if (drv->remove) {
dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n",
__func__, __LINE__);
drv->remove(dev);
} else {
dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__,
__LINE__);
BUG();
}
ps3_vuart_cleanup(dev);
dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
mutex_unlock(&vuart_bus_priv.probe_mutex);
return 0;
}
static int __init ps3_vuart_bus_init(void)
{
pr_debug("%s:%d:\n", __func__, __LINE__);
if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
return -ENODEV;
mutex_init(&vuart_bus_priv.probe_mutex);
return 0;
}
static void __exit ps3_vuart_bus_exit(void)
{
pr_debug("%s:%d:\n", __func__, __LINE__);
}
core_initcall(ps3_vuart_bus_init);
module_exit(ps3_vuart_bus_exit);
/**
* ps3_vuart_port_driver_register - Add a vuart port device driver.
*/
int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
{
int result;
pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
BUG_ON(!drv->core.match_id);
BUG_ON(!drv->core.core.name);
drv->core.probe = ps3_vuart_probe;
drv->core.remove = ps3_vuart_remove;
drv->core.shutdown = ps3_vuart_shutdown;
result = ps3_system_bus_driver_register(&drv->core);
return result;
}
EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
/**
* ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
*/
void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
{
pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
ps3_system_bus_driver_unregister(&drv->core);
}
EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);