linux/drivers/ps3/ps3-vuart.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1272 lines
31 KiB
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,
IRQF_DISABLED, "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);