blob: d1812d32f47d40c4c5e3c028aae8727c755f451f [file] [log] [blame]
/*
* Core maple bus functionality
*
* Copyright (C) 2007, 2008 Adrian McMenamin
* Copyright (C) 2001 - 2008 Paul Mundt
*
* Based on 2.4 code by:
*
* Copyright (C) 2000-2001 YAEGASHI Takeshi
* Copyright (C) 2001 M. R. Brown
* Copyright (C) 2001 Paul Mundt
*
* and others.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/maple.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <mach/dma.h>
#include <mach/sysasic.h>
MODULE_AUTHOR("Yaegashi Takeshi, Paul Mundt, M. R. Brown, Adrian McMenamin");
MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
MODULE_LICENSE("GPL v2");
MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}");
static void maple_dma_handler(struct work_struct *work);
static void maple_vblank_handler(struct work_struct *work);
static DECLARE_WORK(maple_dma_process, maple_dma_handler);
static DECLARE_WORK(maple_vblank_process, maple_vblank_handler);
static LIST_HEAD(maple_waitq);
static LIST_HEAD(maple_sentq);
/* mutex to protect queue of waiting packets */
static DEFINE_MUTEX(maple_wlist_lock);
static struct maple_driver maple_dummy_driver;
static struct device maple_bus;
static int subdevice_map[MAPLE_PORTS];
static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
static unsigned long maple_pnp_time;
static int started, scanning, fullscan;
static struct kmem_cache *maple_queue_cache;
struct maple_device_specify {
int port;
int unit;
};
static bool checked[4];
static struct maple_device *baseunits[4];
/**
* maple_driver_register - register a maple driver
* @drv: maple driver to be registered.
*
* Registers the passed in @drv, while updating the bus type.
* Devices with matching function IDs will be automatically probed.
*/
int maple_driver_register(struct maple_driver *drv)
{
if (!drv)
return -EINVAL;
drv->drv.bus = &maple_bus_type;
return driver_register(&drv->drv);
}
EXPORT_SYMBOL_GPL(maple_driver_register);
/**
* maple_driver_unregister - unregister a maple driver.
* @drv: maple driver to unregister.
*
* Cleans up after maple_driver_register(). To be invoked in the exit
* path of any module drivers.
*/
void maple_driver_unregister(struct maple_driver *drv)
{
driver_unregister(&drv->drv);
}
EXPORT_SYMBOL_GPL(maple_driver_unregister);
/* set hardware registers to enable next round of dma */
static void maplebus_dma_reset(void)
{
ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
/* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
ctrl_outl(1, MAPLE_TRIGTYPE);
ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
ctrl_outl(1, MAPLE_ENABLE);
}
/**
* maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
* @dev: device responding
* @callback: handler callback
* @interval: interval in jiffies between callbacks
* @function: the function code for the device
*/
void maple_getcond_callback(struct maple_device *dev,
void (*callback) (struct mapleq *mq),
unsigned long interval, unsigned long function)
{
dev->callback = callback;
dev->interval = interval;
dev->function = cpu_to_be32(function);
dev->when = jiffies;
}
EXPORT_SYMBOL_GPL(maple_getcond_callback);
static int maple_dma_done(void)
{
return (ctrl_inl(MAPLE_STATE) & 1) == 0;
}
static void maple_release_device(struct device *dev)
{
struct maple_device *mdev;
struct mapleq *mq;
if (!dev)
return;
mdev = to_maple_dev(dev);
mq = mdev->mq;
if (mq) {
if (mq->recvbufdcsp)
kmem_cache_free(maple_queue_cache, mq->recvbufdcsp);
kfree(mq);
mq = NULL;
}
kfree(mdev);
}
/**
* maple_add_packet - add a single instruction to the queue
* @mdev: maple device
* @function: function on device being queried
* @command: maple command to add
* @length: length of command string (in 32 bit words)
* @data: remainder of command string
*/
int maple_add_packet(struct maple_device *mdev, u32 function, u32 command,
size_t length, void *data)
{
int locking, ret = 0;
void *sendbuf = NULL;
mutex_lock(&maple_wlist_lock);
/* bounce if device already locked */
locking = mutex_is_locked(&mdev->mq->mutex);
if (locking) {
ret = -EBUSY;
goto out;
}
mutex_lock(&mdev->mq->mutex);
if (length) {
sendbuf = kmalloc(length * 4, GFP_KERNEL);
if (!sendbuf) {
mutex_unlock(&mdev->mq->mutex);
ret = -ENOMEM;
goto out;
}
((__be32 *)sendbuf)[0] = cpu_to_be32(function);
}
mdev->mq->command = command;
mdev->mq->length = length;
if (length > 1)
memcpy(sendbuf + 4, data, (length - 1) * 4);
mdev->mq->sendbuf = sendbuf;
list_add(&mdev->mq->list, &maple_waitq);
out:
mutex_unlock(&maple_wlist_lock);
return ret;
}
EXPORT_SYMBOL_GPL(maple_add_packet);
/**
* maple_add_packet_sleeps - add a single instruction to the queue
* @mdev: maple device
* @function: function on device being queried
* @command: maple command to add
* @length: length of command string (in 32 bit words)
* @data: remainder of command string
*
* Same as maple_add_packet(), but waits for the lock to become free.
*/
int maple_add_packet_sleeps(struct maple_device *mdev, u32 function,
u32 command, size_t length, void *data)
{
int locking, ret = 0;
void *sendbuf = NULL;
locking = mutex_lock_interruptible(&mdev->mq->mutex);
if (locking) {
ret = -EIO;
goto out;
}
if (length) {
sendbuf = kmalloc(length * 4, GFP_KERNEL);
if (!sendbuf) {
mutex_unlock(&mdev->mq->mutex);
ret = -ENOMEM;
goto out;
}
((__be32 *)sendbuf)[0] = cpu_to_be32(function);
}
mdev->mq->command = command;
mdev->mq->length = length;
if (length > 1)
memcpy(sendbuf + 4, data, (length - 1) * 4);
mdev->mq->sendbuf = sendbuf;
mutex_lock(&maple_wlist_lock);
list_add(&mdev->mq->list, &maple_waitq);
mutex_unlock(&maple_wlist_lock);
out:
return ret;
}
EXPORT_SYMBOL_GPL(maple_add_packet_sleeps);
static struct mapleq *maple_allocq(struct maple_device *mdev)
{
struct mapleq *mq;
mq = kmalloc(sizeof(*mq), GFP_KERNEL);
if (!mq)
goto failed_nomem;
mq->dev = mdev;
mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
if (!mq->recvbuf)
goto failed_p2;
/*
* most devices do not need the mutex - but
* anything that injects block reads or writes
* will rely on it
*/
mutex_init(&mq->mutex);
return mq;
failed_p2:
kfree(mq);
failed_nomem:
return NULL;
}
static struct maple_device *maple_alloc_dev(int port, int unit)
{
struct maple_device *mdev;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
return NULL;
mdev->port = port;
mdev->unit = unit;
mdev->mq = maple_allocq(mdev);
if (!mdev->mq) {
kfree(mdev);
return NULL;
}
mdev->dev.bus = &maple_bus_type;
mdev->dev.parent = &maple_bus;
return mdev;
}
static void maple_free_dev(struct maple_device *mdev)
{
if (!mdev)
return;
if (mdev->mq) {
if (mdev->mq->recvbufdcsp)
kmem_cache_free(maple_queue_cache,
mdev->mq->recvbufdcsp);
kfree(mdev->mq);
}
kfree(mdev);
}
/* process the command queue into a maple command block
* terminating command has bit 32 of first long set to 0
*/
static void maple_build_block(struct mapleq *mq)
{
int port, unit, from, to, len;
unsigned long *lsendbuf = mq->sendbuf;
port = mq->dev->port & 3;
unit = mq->dev->unit;
len = mq->length;
from = port << 6;
to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
*maple_lastptr &= 0x7fffffff;
maple_lastptr = maple_sendptr;
*maple_sendptr++ = (port << 16) | len | 0x80000000;
*maple_sendptr++ = PHYSADDR(mq->recvbuf);
*maple_sendptr++ =
mq->command | (to << 8) | (from << 16) | (len << 24);
while (len-- > 0)
*maple_sendptr++ = *lsendbuf++;
}
/* build up command queue */
static void maple_send(void)
{
int i, maple_packets = 0;
struct mapleq *mq, *nmq;
if (!list_empty(&maple_sentq))
return;
mutex_lock(&maple_wlist_lock);
if (list_empty(&maple_waitq) || !maple_dma_done()) {
mutex_unlock(&maple_wlist_lock);
return;
}
mutex_unlock(&maple_wlist_lock);
maple_lastptr = maple_sendbuf;
maple_sendptr = maple_sendbuf;
mutex_lock(&maple_wlist_lock);
list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
maple_build_block(mq);
list_move(&mq->list, &maple_sentq);
if (maple_packets++ > MAPLE_MAXPACKETS)
break;
}
mutex_unlock(&maple_wlist_lock);
if (maple_packets > 0) {
for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
PAGE_SIZE, DMA_BIDIRECTIONAL);
}
}
/* check if there is a driver registered likely to match this device */
static int check_matching_maple_driver(struct device_driver *driver,
void *devptr)
{
struct maple_driver *maple_drv;
struct maple_device *mdev;
mdev = devptr;
maple_drv = to_maple_driver(driver);
if (mdev->devinfo.function & cpu_to_be32(maple_drv->function))
return 1;
return 0;
}
static void maple_detach_driver(struct maple_device *mdev)
{
if (!mdev)
return;
device_unregister(&mdev->dev);
mdev = NULL;
}
/* process initial MAPLE_COMMAND_DEVINFO for each device or port */
static void maple_attach_driver(struct maple_device *mdev)
{
char *p, *recvbuf;
unsigned long function;
int matched, retval;
recvbuf = mdev->mq->recvbuf;
/* copy the data as individual elements in
* case of memory optimisation */
memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
memcpy(&mdev->devinfo.product_licence[0], recvbuf + 52, 60);
memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
mdev->product_name[30] = '\0';
memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
mdev->product_licence[60] = '\0';
for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
if (*p == ' ')
*p = '\0';
else
break;
for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
if (*p == ' ')
*p = '\0';
else
break;
printk(KERN_INFO "Maple device detected: %s\n",
mdev->product_name);
printk(KERN_INFO "Maple device: %s\n", mdev->product_licence);
function = be32_to_cpu(mdev->devinfo.function);
if (function > 0x200) {
/* Do this silently - as not a real device */
function = 0;
mdev->driver = &maple_dummy_driver;
sprintf(mdev->dev.bus_id, "%d:0.port", mdev->port);
} else {
printk(KERN_INFO
"Maple bus at (%d, %d): Function 0x%lX\n",
mdev->port, mdev->unit, function);
matched =
bus_for_each_drv(&maple_bus_type, NULL, mdev,
check_matching_maple_driver);
if (matched == 0) {
/* Driver does not exist yet */
printk(KERN_INFO
"No maple driver found.\n");
mdev->driver = &maple_dummy_driver;
}
sprintf(mdev->dev.bus_id, "%d:0%d.%lX", mdev->port,
mdev->unit, function);
}
mdev->function = function;
mdev->dev.release = &maple_release_device;
retval = device_register(&mdev->dev);
if (retval) {
printk(KERN_INFO
"Maple bus: Attempt to register device"
" (%x, %x) failed.\n",
mdev->port, mdev->unit);
maple_free_dev(mdev);
mdev = NULL;
return;
}
}
/*
* if device has been registered for the given
* port and unit then return 1 - allows identification
* of which devices need to be attached or detached
*/
static int detach_maple_device(struct device *device, void *portptr)
{
struct maple_device_specify *ds;
struct maple_device *mdev;
ds = portptr;
mdev = to_maple_dev(device);
if (mdev->port == ds->port && mdev->unit == ds->unit)
return 1;
return 0;
}
static int setup_maple_commands(struct device *device, void *ignored)
{
int add;
struct maple_device *maple_dev = to_maple_dev(device);
if ((maple_dev->interval > 0)
&& time_after(jiffies, maple_dev->when)) {
/* bounce if we cannot lock */
add = maple_add_packet(maple_dev,
be32_to_cpu(maple_dev->devinfo.function),
MAPLE_COMMAND_GETCOND, 1, NULL);
if (!add)
maple_dev->when = jiffies + maple_dev->interval;
} else {
if (time_after(jiffies, maple_pnp_time))
/* This will also bounce */
maple_add_packet(maple_dev, 0,
MAPLE_COMMAND_DEVINFO, 0, NULL);
}
return 0;
}
/* VBLANK bottom half - implemented via workqueue */
static void maple_vblank_handler(struct work_struct *work)
{
if (!list_empty(&maple_sentq) || !maple_dma_done())
return;
ctrl_outl(0, MAPLE_ENABLE);
bus_for_each_dev(&maple_bus_type, NULL, NULL,
setup_maple_commands);
if (time_after(jiffies, maple_pnp_time))
maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
mutex_lock(&maple_wlist_lock);
if (!list_empty(&maple_waitq) && list_empty(&maple_sentq)) {
mutex_unlock(&maple_wlist_lock);
maple_send();
} else {
mutex_unlock(&maple_wlist_lock);
}
maplebus_dma_reset();
}
/* handle devices added via hotplugs - placing them on queue for DEVINFO*/
static void maple_map_subunits(struct maple_device *mdev, int submask)
{
int retval, k, devcheck;
struct maple_device *mdev_add;
struct maple_device_specify ds;
ds.port = mdev->port;
for (k = 0; k < 5; k++) {
ds.unit = k + 1;
retval =
bus_for_each_dev(&maple_bus_type, NULL, &ds,
detach_maple_device);
if (retval) {
submask = submask >> 1;
continue;
}
devcheck = submask & 0x01;
if (devcheck) {
mdev_add = maple_alloc_dev(mdev->port, k + 1);
if (!mdev_add)
return;
maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO,
0, NULL);
/* mark that we are checking sub devices */
scanning = 1;
}
submask = submask >> 1;
}
}
/* mark a device as removed */
static void maple_clean_submap(struct maple_device *mdev)
{
int killbit;
killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
killbit = ~killbit;
killbit &= 0xFF;
subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
}
/* handle empty port or hotplug removal */
static void maple_response_none(struct maple_device *mdev,
struct mapleq *mq)
{
if (mdev->unit != 0) {
list_del(&mq->list);
maple_clean_submap(mdev);
printk(KERN_INFO
"Maple bus device detaching at (%d, %d)\n",
mdev->port, mdev->unit);
maple_detach_driver(mdev);
return;
}
if (!started || !fullscan) {
if (checked[mdev->port] == false) {
checked[mdev->port] = true;
printk(KERN_INFO "No maple devices attached"
" to port %d\n", mdev->port);
}
return;
}
maple_clean_submap(mdev);
}
/* preprocess hotplugs or scans */
static void maple_response_devinfo(struct maple_device *mdev,
char *recvbuf)
{
char submask;
if (!started || (scanning == 2) || !fullscan) {
if ((mdev->unit == 0) && (checked[mdev->port] == false)) {
checked[mdev->port] = true;
maple_attach_driver(mdev);
} else {
if (mdev->unit != 0)
maple_attach_driver(mdev);
}
return;
}
if (mdev->unit == 0) {
submask = recvbuf[2] & 0x1F;
if (submask ^ subdevice_map[mdev->port]) {
maple_map_subunits(mdev, submask);
subdevice_map[mdev->port] = submask;
}
}
}
static void maple_port_rescan(void)
{
int i;
struct maple_device *mdev;
fullscan = 1;
for (i = 0; i < MAPLE_PORTS; i++) {
if (checked[i] == false) {
fullscan = 0;
mdev = baseunits[i];
/*
* test lock in case scan has failed
* but device is still locked
*/
if (mutex_is_locked(&mdev->mq->mutex))
mutex_unlock(&mdev->mq->mutex);
maple_add_packet(mdev, 0, MAPLE_COMMAND_DEVINFO,
0, NULL);
}
}
}
/* maple dma end bottom half - implemented via workqueue */
static void maple_dma_handler(struct work_struct *work)
{
struct mapleq *mq, *nmq;
struct maple_device *dev;
char *recvbuf;
enum maple_code code;
if (!maple_dma_done())
return;
ctrl_outl(0, MAPLE_ENABLE);
if (!list_empty(&maple_sentq)) {
list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
recvbuf = mq->recvbuf;
code = recvbuf[0];
dev = mq->dev;
kfree(mq->sendbuf);
mutex_unlock(&mq->mutex);
list_del_init(&mq->list);
switch (code) {
case MAPLE_RESPONSE_NONE:
maple_response_none(dev, mq);
break;
case MAPLE_RESPONSE_DEVINFO:
maple_response_devinfo(dev, recvbuf);
break;
case MAPLE_RESPONSE_DATATRF:
if (dev->callback)
dev->callback(mq);
break;
case MAPLE_RESPONSE_FILEERR:
case MAPLE_RESPONSE_AGAIN:
case MAPLE_RESPONSE_BADCMD:
case MAPLE_RESPONSE_BADFUNC:
printk(KERN_DEBUG
"Maple non-fatal error 0x%X\n",
code);
break;
case MAPLE_RESPONSE_ALLINFO:
printk(KERN_DEBUG
"Maple - extended device information"
" not supported\n");
break;
case MAPLE_RESPONSE_OK:
break;
default:
break;
}
}
/* if scanning is 1 then we have subdevices to check */
if (scanning == 1) {
maple_send();
scanning = 2;
} else
scanning = 0;
/*check if we have actually tested all ports yet */
if (!fullscan)
maple_port_rescan();
/* mark that we have been through the first scan */
if (started == 0)
started = 1;
}
maplebus_dma_reset();
}
static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
{
/* Load everything into the bottom half */
schedule_work(&maple_dma_process);
return IRQ_HANDLED;
}
static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
{
schedule_work(&maple_vblank_process);
return IRQ_HANDLED;
}
static int maple_set_dma_interrupt_handler(void)
{
return request_irq(HW_EVENT_MAPLE_DMA, maplebus_dma_interrupt,
IRQF_SHARED, "maple bus DMA", &maple_dummy_driver);
}
static int maple_set_vblank_interrupt_handler(void)
{
return request_irq(HW_EVENT_VSYNC, maplebus_vblank_interrupt,
IRQF_SHARED, "maple bus VBLANK", &maple_dummy_driver);
}
static int maple_get_dma_buffer(void)
{
maple_sendbuf =
(void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
MAPLE_DMA_PAGES);
if (!maple_sendbuf)
return -ENOMEM;
return 0;
}
static int match_maple_bus_driver(struct device *devptr,
struct device_driver *drvptr)
{
struct maple_driver *maple_drv = to_maple_driver(drvptr);
struct maple_device *maple_dev = to_maple_dev(devptr);
/* Trap empty port case */
if (maple_dev->devinfo.function == 0xFFFFFFFF)
return 0;
else if (maple_dev->devinfo.function &
cpu_to_be32(maple_drv->function))
return 1;
return 0;
}
static int maple_bus_uevent(struct device *dev,
struct kobj_uevent_env *env)
{
return 0;
}
static void maple_bus_release(struct device *dev)
{
}
static struct maple_driver maple_dummy_driver = {
.drv = {
.name = "maple_dummy_driver",
.bus = &maple_bus_type,
},
};
struct bus_type maple_bus_type = {
.name = "maple",
.match = match_maple_bus_driver,
.uevent = maple_bus_uevent,
};
EXPORT_SYMBOL_GPL(maple_bus_type);
static struct device maple_bus = {
.bus_id = "maple",
.release = maple_bus_release,
};
static int __init maple_bus_init(void)
{
int retval, i;
struct maple_device *mdev[MAPLE_PORTS];
ctrl_outl(0, MAPLE_STATE);
retval = device_register(&maple_bus);
if (retval)
goto cleanup;
retval = bus_register(&maple_bus_type);
if (retval)
goto cleanup_device;
retval = driver_register(&maple_dummy_driver.drv);
if (retval)
goto cleanup_bus;
/* allocate memory for maple bus dma */
retval = maple_get_dma_buffer();
if (retval) {
printk(KERN_INFO
"Maple bus: Failed to allocate Maple DMA buffers\n");
goto cleanup_basic;
}
/* set up DMA interrupt handler */
retval = maple_set_dma_interrupt_handler();
if (retval) {
printk(KERN_INFO
"Maple bus: Failed to grab maple DMA IRQ\n");
goto cleanup_dma;
}
/* set up VBLANK interrupt handler */
retval = maple_set_vblank_interrupt_handler();
if (retval) {
printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
goto cleanup_irq;
}
maple_queue_cache =
kmem_cache_create("maple_queue_cache", 0x400, 0,
SLAB_POISON|SLAB_HWCACHE_ALIGN, NULL);
if (!maple_queue_cache)
goto cleanup_bothirqs;
INIT_LIST_HEAD(&maple_waitq);
INIT_LIST_HEAD(&maple_sentq);
/* setup maple ports */
for (i = 0; i < MAPLE_PORTS; i++) {
checked[i] = false;
mdev[i] = maple_alloc_dev(i, 0);
baseunits[i] = mdev[i];
if (!mdev[i]) {
while (i-- > 0)
maple_free_dev(mdev[i]);
goto cleanup_cache;
}
maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL);
subdevice_map[i] = 0;
}
/* setup maplebus hardware */
maplebus_dma_reset();
/* initial detection */
maple_send();
maple_pnp_time = jiffies;
printk(KERN_INFO "Maple bus core now registered.\n");
return 0;
cleanup_cache:
kmem_cache_destroy(maple_queue_cache);
cleanup_bothirqs:
free_irq(HW_EVENT_VSYNC, 0);
cleanup_irq:
free_irq(HW_EVENT_MAPLE_DMA, 0);
cleanup_dma:
free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
cleanup_basic:
driver_unregister(&maple_dummy_driver.drv);
cleanup_bus:
bus_unregister(&maple_bus_type);
cleanup_device:
device_unregister(&maple_bus);
cleanup:
printk(KERN_INFO "Maple bus registration failed\n");
return retval;
}
/* Push init to later to ensure hardware gets detected */
fs_initcall(maple_bus_init);