/*
* 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 <asm/ps3.h>
#include <asm/lv1call.h>
#include <asm/bitops.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 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)));
/* redefine dev_dbg to do a syntax check */
#if !defined(DEBUG)
#undef dev_dbg
static inline int __attribute__ ((format (printf, 2, 3))) dev_dbg(
const struct device *_dev, const char *fmt, ...) {return 0;}
#endif
#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
static void __attribute__ ((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);
}
static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id,
unsigned int *port_number)
{
switch(match_id) {
case PS3_MATCH_ID_AV_SETTINGS:
*port_number = 0;
return 0;
case PS3_MATCH_ID_SYSTEM_MANAGER:
*port_number = 2;
return 0;
default:
WARN_ON(1);
*port_number = UINT_MAX;
return -EINVAL;
};
}
#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
static void __attribute__ ((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_vuart_port_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_vuart_port_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_vuart_port_device *dev,
unsigned long *bytes_waiting)
{
int 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;
}
static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
unsigned long mask)
{
int result;
dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
dev->interrupt_mask = mask;
result = lv1_set_virtual_uart_param(dev->port_number,
PARAM_INTERRUPT_MASK, dev->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_mask(struct ps3_vuart_port_device *dev,
unsigned long *status)
{
int result = lv1_get_virtual_uart_param(dev->port_number,
PARAM_INTERRUPT_STATUS, status);
if (result)
dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
__func__, __LINE__, ps3_result(result));
dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
__func__, __LINE__, dev->interrupt_mask, *status,
dev->interrupt_mask & *status);
return result;
}
int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_TX) ? 0
: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
| INTERRUPT_MASK_TX);
}
int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_RX) ? 0
: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
| INTERRUPT_MASK_RX);
}
int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
: ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
| INTERRUPT_MASK_DISCONNECT);
}
int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_TX)
? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
& ~INTERRUPT_MASK_TX) : 0;
}
int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_RX)
? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
& ~INTERRUPT_MASK_RX) : 0;
}
int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
{
return (dev->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
? ps3_vuart_set_interrupt_mask(dev, dev->interrupt_mask
& ~INTERRUPT_MASK_DISCONNECT) : 0;
}
/**
* ps3_vuart_raw_write - Low level write helper.
*
* Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
*/
static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
const void* buf, unsigned int bytes, unsigned long *bytes_written)
{
int result;
dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
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;
}
dev->stats.bytes_written += *bytes_written;
dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__,
__LINE__, *bytes_written, bytes, dev->stats.bytes_written);
return result;
}
/**
* ps3_vuart_raw_read - Low level read helper.
*
* Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
*/
static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
unsigned int bytes, unsigned long *bytes_read)
{
int result;
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;
}
dev->stats.bytes_read += *bytes_read;
dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
*bytes_read, bytes, dev->stats.bytes_read);
return result;
}
/**
* 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
*
* 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_vuart_port_device *dev, const void* buf,
unsigned int bytes)
{
static unsigned long dbg_number;
int result;
unsigned long flags;
struct list_buffer *lb;
dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
bytes, bytes);
spin_lock_irqsave(&dev->tx_list.lock, flags);
if (list_empty(&dev->tx_list.head)) {
unsigned long bytes_written;
result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
spin_unlock_irqrestore(&dev->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(&dev->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(&dev->tx_list.lock, flags);
list_add_tail(&lb->link, &dev->tx_list.head);
ps3_vuart_enable_interrupt_tx(dev);
spin_unlock_irqrestore(&dev->tx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes);
return 0;
}
/**
* ps3_vuart_read - the entry point for reading data from a port
*
* 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_vuart_port_device *dev, void* buf,
unsigned int bytes)
{
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(&dev->rx_list.lock, flags);
if (dev->rx_list.bytes_held < bytes) {
spin_unlock_irqrestore(&dev->rx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
__func__, __LINE__, bytes - dev->rx_list.bytes_held);
return -EAGAIN;
}
list_for_each_entry_safe(lb, n, &dev->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;
dev->rx_list.bytes_held -= bytes_read;
if (bytes_read < lb->tail - lb->head) {
lb->head += bytes_read;
spin_unlock_irqrestore(&dev->rx_list.lock, flags);
dev_dbg(&dev->core,
"%s:%d: dequeued buf_%lu, %lxh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes_read);
return 0;
}
dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
lb->dbg_number);
list_del(&lb->link);
kfree(lb);
}
spin_unlock_irqrestore(&dev->rx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: dequeued buf_%lu, %xh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes);
return 0;
}
/**
* 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_vuart_port_device *dev)
{
int result = 0;
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(&dev->tx_list.lock, flags);
list_for_each_entry_safe(lb, n, &dev->tx_list.head, link) {
unsigned long 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, %lxh 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(&dev->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_vuart_port_device *dev)
{
static unsigned long dbg_number;
int result = 0;
unsigned long flags;
struct list_buffer *lb;
unsigned long bytes;
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
if (result)
return -EIO;
BUG_ON(!bytes);
/* 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;
spin_lock_irqsave(&dev->rx_list.lock, flags);
list_add_tail(&lb->link, &dev->rx_list.head);
dev->rx_list.bytes_held += bytes;
spin_unlock_irqrestore(&dev->rx_list.lock, flags);
dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %lxh bytes\n",
__func__, __LINE__, lb->dbg_number, bytes);
return 0;
}
static int ps3_vuart_handle_interrupt_disconnect(
struct ps3_vuart_port_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_vuart_port_device *dev)
{
int result;
unsigned long status;
result = ps3_vuart_get_interrupt_mask(dev, &status);
if (result)
return result;
dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
status);
if (status & INTERRUPT_MASK_DISCONNECT) {
dev->stats.disconnect_interrupts++;
result = ps3_vuart_handle_interrupt_disconnect(dev);
if (result)
ps3_vuart_disable_interrupt_disconnect(dev);
}
if (status & INTERRUPT_MASK_TX) {
dev->stats.tx_interrupts++;
result = ps3_vuart_handle_interrupt_tx(dev);
if (result)
ps3_vuart_disable_interrupt_tx(dev);
}
if (status & INTERRUPT_MASK_RX) {
dev->stats.rx_interrupts++;
result = ps3_vuart_handle_interrupt_rx(dev);
if (result)
ps3_vuart_disable_interrupt_rx(dev);
}
return 0;
}
struct vuart_private {
unsigned int in_use;
unsigned int virq;
struct ps3_vuart_port_device *devices[PORT_COUNT];
const struct ports_bmp bmp;
};
/**
* 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_private *private;
BUG_ON(!_private);
private = (struct vuart_private *)_private;
while (1) {
unsigned int port;
dump_ports_bmp(&private->bmp);
port = (BITS_PER_LONG - 1) - __ilog2(private->bmp.status);
if (port == BITS_PER_LONG)
break;
BUG_ON(port >= PORT_COUNT);
BUG_ON(!private->devices[port]);
ps3_vuart_handle_port_interrupt(private->devices[port]);
}
return IRQ_HANDLED;
}
static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv)
{
int result;
struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv);
struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
result = dev->match_id == drv->match_id;
dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__,
__LINE__, dev->match_id, dev->core.bus_id, drv->match_id,
drv->core.name, (result ? "match" : "miss"));
return result;
}
static struct vuart_private vuart_private;
static int ps3_vuart_probe(struct device *_dev)
{
int result;
unsigned long tmp;
struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
struct ps3_vuart_port_driver *drv =
to_ps3_vuart_port_driver(_dev->driver);
dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
BUG_ON(!drv);
result = ps3_vuart_match_id_to_port(dev->match_id, &dev->port_number);
if (result) {
dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n",
__func__, __LINE__, dev->match_id);
result = -EINVAL;
goto fail_match;
}
if (vuart_private.devices[dev->port_number]) {
dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
__LINE__, dev->port_number);
result = -EBUSY;
goto fail_match;
}
vuart_private.devices[dev->port_number] = dev;
INIT_LIST_HEAD(&dev->tx_list.head);
spin_lock_init(&dev->tx_list.lock);
INIT_LIST_HEAD(&dev->rx_list.head);
spin_lock_init(&dev->rx_list.lock);
vuart_private.in_use++;
if (vuart_private.in_use == 1) {
result = ps3_alloc_vuart_irq((void*)&vuart_private.bmp.status,
&vuart_private.virq);
if (result) {
dev_dbg(&dev->core,
"%s:%d: ps3_alloc_vuart_irq failed (%d)\n",
__func__, __LINE__, result);
result = -EPERM;
goto fail_alloc_irq;
}
result = request_irq(vuart_private.virq, ps3_vuart_irq_handler,
IRQF_DISABLED, "vuart", &vuart_private);
if (result) {
dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n",
__func__, __LINE__, result);
goto fail_request_irq;
}
}
ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
/* clear stale pending interrupts */
ps3_vuart_get_interrupt_mask(dev, &tmp);
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;
}
return result;
fail_probe:
fail_request_irq:
vuart_private.in_use--;
if (!vuart_private.in_use) {
ps3_free_vuart_irq(vuart_private.virq);
vuart_private.virq = NO_IRQ;
}
fail_alloc_irq:
fail_match:
dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__);
return result;
}
static int ps3_vuart_remove(struct device *_dev)
{
struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
struct ps3_vuart_port_driver *drv =
to_ps3_vuart_port_driver(_dev->driver);
dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
dev->core.bus_id);
BUG_ON(vuart_private.in_use < 1);
if (drv->remove)
drv->remove(dev);
else
dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__,
__LINE__, dev->core.bus_id);
vuart_private.in_use--;
if (!vuart_private.in_use) {
free_irq(vuart_private.virq, &vuart_private);
ps3_free_vuart_irq(vuart_private.virq);
vuart_private.virq = NO_IRQ;
}
return 0;
}
/**
* ps3_vuart - The vuart instance.
*
* The vuart is managed as a bus that port devices connect to.
*/
struct bus_type ps3_vuart = {
.name = "ps3_vuart",
.match = ps3_vuart_match,
.probe = ps3_vuart_probe,
.remove = ps3_vuart_remove,
};
int __init ps3_vuart_init(void)
{
int result;
pr_debug("%s:%d:\n", __func__, __LINE__);
result = bus_register(&ps3_vuart);
BUG_ON(result);
return result;
}
void __exit ps3_vuart_exit(void)
{
pr_debug("%s:%d:\n", __func__, __LINE__);
bus_unregister(&ps3_vuart);
}
core_initcall(ps3_vuart_init);
module_exit(ps3_vuart_exit);
/**
* ps3_vuart_port_release_device - Remove a vuart port device.
*/
static void ps3_vuart_port_release_device(struct device *_dev)
{
struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
#if defined(DEBUG)
memset(dev, 0xad, sizeof(struct ps3_vuart_port_device));
#endif
kfree(dev);
}
/**
* ps3_vuart_port_device_register - Add a vuart port device.
*/
int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev)
{
int result;
static unsigned int dev_count = 1;
dev->core.parent = NULL;
dev->core.bus = &ps3_vuart;
dev->core.release = ps3_vuart_port_release_device;
snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x",
dev_count++);
dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__);
result = device_register(&dev->core);
return result;
}
EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register);
/**
* 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.name);
drv->core.bus = &ps3_vuart;
result = 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)
{
driver_unregister(&drv->core);
}
EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);
