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linux/drivers/sh/maple/maple.c
Christoph Hellwig 47fcae0d2a sh: introduce a sh_cacheop_vaddr helper 
And use it in the maple bus code to avoid a dma API dependency.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Yoshinori Sato <ysato@users.sourceforge.jp>
2018-08-02 13:54:06 +02:00

894 lines
21 KiB
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/*
* Core maple bus functionality
*
* Copyright (C) 2007 - 2009 Adrian McMenamin
* Copyright (C) 2001 - 2008 Paul Mundt
* Copyright (C) 2000 - 2001 YAEGASHI Takeshi
* Copyright (C) 2001 M. R. Brown
*
* 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 <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <mach/dma.h>
#include <mach/sysasic.h>
MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
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_unsupported_device;
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[MAPLE_PORTS];
static bool empty[MAPLE_PORTS];
static struct maple_device *baseunits[MAPLE_PORTS];
/**
* 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 maple_dma_reset(void)
{
__raw_writel(MAPLE_MAGIC, MAPLE_RESET);
/* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
__raw_writel(1, MAPLE_TRIGTYPE);
/*
* Maple system register
* bits 31 - 16 timeout in units of 20nsec
* bit 12 hard trigger - set 0 to keep responding to VBLANK
* bits 9 - 8 set 00 for 2 Mbps, 01 for 1 Mbps
* bits 3 - 0 delay (in 1.3ms) between VBLANK and start of DMA
* max delay is 11
*/
__raw_writel(MAPLE_2MBPS | MAPLE_TIMEOUT(0xFFFF), MAPLE_SPEED);
__raw_writel(virt_to_phys(maple_sendbuf), MAPLE_DMAADDR);
__raw_writel(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 (__raw_readl(MAPLE_STATE) & 1) == 0;
}
static void maple_release_device(struct device *dev)
{
struct maple_device *mdev;
struct mapleq *mq;
mdev = to_maple_dev(dev);
mq = mdev->mq;
kmem_cache_free(maple_queue_cache, mq->recvbuf);
kfree(mq);
kfree(mdev);
}
/**
* maple_add_packet - add a single instruction to the maple bus 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 ret = 0;
void *sendbuf = NULL;
if (length) {
sendbuf = kcalloc(length, 4, GFP_KERNEL);
if (!sendbuf) {
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_tail(&mdev->mq->list, &maple_waitq);
mutex_unlock(&maple_wlist_lock);
out:
return ret;
}
EXPORT_SYMBOL_GPL(maple_add_packet);
static struct mapleq *maple_allocq(struct maple_device *mdev)
{
struct mapleq *mq;
mq = kzalloc(sizeof(*mq), GFP_KERNEL);
if (!mq)
goto failed_nomem;
INIT_LIST_HEAD(&mq->list);
mq->dev = mdev;
mq->recvbuf = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
if (!mq->recvbuf)
goto failed_p2;
mq->recvbuf->buf = &((mq->recvbuf->bufx)[0]);
return mq;
failed_p2:
kfree(mq);
failed_nomem:
dev_err(&mdev->dev, "could not allocate memory for device (%d, %d)\n",
mdev->port, mdev->unit);
return NULL;
}
static struct maple_device *maple_alloc_dev(int port, int unit)
{
struct maple_device *mdev;
/* zero this out to avoid kobj subsystem
* thinking it has already been registered */
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;
init_waitqueue_head(&mdev->maple_wait);
return mdev;
}
static void maple_free_dev(struct maple_device *mdev)
{
kmem_cache_free(maple_queue_cache, mdev->mq->recvbuf);
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++ = virt_to_phys(mq->recvbuf->buf);
*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 (!maple_dma_done())
return;
/* disable DMA */
__raw_writel(0, MAPLE_ENABLE);
if (!list_empty(&maple_sentq))
goto finish;
mutex_lock(&maple_wlist_lock);
if (list_empty(&maple_waitq)) {
mutex_unlock(&maple_wlist_lock);
goto finish;
}
maple_lastptr = maple_sendbuf;
maple_sendptr = maple_sendbuf;
list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
maple_build_block(mq);
list_del_init(&mq->list);
list_add_tail(&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++)
__flush_purge_region(maple_sendbuf + i * PAGE_SIZE,
PAGE_SIZE);
}
finish:
maple_dma_reset();
}
/* check if there is a driver registered likely to match this device */
static int maple_check_matching_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)
{
device_unregister(&mdev->dev);
}
/* 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, error;
recvbuf = mdev->mq->recvbuf->buf;
/* 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.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;
function = be32_to_cpu(mdev->devinfo.function);
dev_info(&mdev->dev, "detected %s: function 0x%lX: at (%d, %d)\n",
mdev->product_name, function, mdev->port, mdev->unit);
if (function > 0x200) {
/* Do this silently - as not a real device */
function = 0;
mdev->driver = &maple_unsupported_device;
dev_set_name(&mdev->dev, "%d:0.port", mdev->port);
} else {
matched =
bus_for_each_drv(&maple_bus_type, NULL, mdev,
maple_check_matching_driver);
if (matched == 0) {
/* Driver does not exist yet */
dev_info(&mdev->dev, "no driver found\n");
mdev->driver = &maple_unsupported_device;
}
dev_set_name(&mdev->dev, "%d:0%d.%lX", mdev->port,
mdev->unit, function);
}
mdev->function = function;
mdev->dev.release = &maple_release_device;
atomic_set(&mdev->busy, 0);
error = device_register(&mdev->dev);
if (error) {
dev_warn(&mdev->dev, "could not register device at"
" (%d, %d), with error 0x%X\n", mdev->unit,
mdev->port, error);
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 check_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 *mdev = to_maple_dev(device);
if (mdev->interval > 0 && atomic_read(&mdev->busy) == 0 &&
time_after(jiffies, mdev->when)) {
/* bounce if we cannot add */
add = maple_add_packet(mdev,
be32_to_cpu(mdev->devinfo.function),
MAPLE_COMMAND_GETCOND, 1, NULL);
if (!add)
mdev->when = jiffies + mdev->interval;
} else {
if (time_after(jiffies, maple_pnp_time))
/* Ensure we don't have block reads and devinfo
* calls interfering with one another - so flag the
* device as busy */
if (atomic_read(&mdev->busy) == 0) {
atomic_set(&mdev->busy, 1);
maple_add_packet(mdev, 0,
MAPLE_COMMAND_DEVINFO, 0, NULL);
}
}
return 0;
}
/* VBLANK bottom half - implemented via workqueue */
static void maple_vblank_handler(struct work_struct *work)
{
int x, locking;
struct maple_device *mdev;
if (!maple_dma_done())
return;
__raw_writel(0, MAPLE_ENABLE);
if (!list_empty(&maple_sentq))
goto finish;
/*
* Set up essential commands - to fetch data and
* check devices are still present
*/
bus_for_each_dev(&maple_bus_type, NULL, NULL,
setup_maple_commands);
if (time_after(jiffies, maple_pnp_time)) {
/*
* Scan the empty ports - bus is flakey and may have
* mis-reported emptyness
*/
for (x = 0; x < MAPLE_PORTS; x++) {
if (checked[x] && empty[x]) {
mdev = baseunits[x];
if (!mdev)
break;
atomic_set(&mdev->busy, 1);
locking = maple_add_packet(mdev, 0,
MAPLE_COMMAND_DEVINFO, 0, NULL);
if (!locking)
break;
}
}
maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
}
finish:
maple_send();
}
/* 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,
check_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;
atomic_set(&mdev_add->busy, 1);
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)
{
maple_clean_submap(mdev);
if (likely(mdev->unit != 0)) {
/*
* Block devices play up
* and give the impression they have
* been removed even when still in place or
* trip the mtd layer when they have
* really gone - this code traps that eventuality
* and ensures we aren't overloaded with useless
* error messages
*/
if (mdev->can_unload) {
if (!mdev->can_unload(mdev)) {
atomic_set(&mdev->busy, 2);
wake_up(&mdev->maple_wait);
return;
}
}
dev_info(&mdev->dev, "detaching device at (%d, %d)\n",
mdev->port, mdev->unit);
maple_detach_driver(mdev);
return;
} else {
if (!started || !fullscan) {
if (checked[mdev->port] == false) {
checked[mdev->port] = true;
empty[mdev->port] = true;
dev_info(&mdev->dev, "no devices"
" to port %d\n", mdev->port);
}
return;
}
}
/* Some hardware devices generate false detach messages on unit 0 */
atomic_set(&mdev->busy, 0);
}
/* 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);
if (mdev->unit == 0) {
empty[mdev->port] = false;
maple_attach_driver(mdev);
}
}
}
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_response_fileerr(struct maple_device *mdev, void *recvbuf)
{
if (mdev->fileerr_handler) {
mdev->fileerr_handler(mdev, recvbuf);
return;
} else
dev_warn(&mdev->dev, "device at (%d, %d) reports"
"file error 0x%X\n", mdev->port, mdev->unit,
((int *)recvbuf)[1]);
}
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];
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 *mdev;
char *recvbuf;
enum maple_code code;
if (!maple_dma_done())
return;
__raw_writel(0, MAPLE_ENABLE);
if (!list_empty(&maple_sentq)) {
list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
mdev = mq->dev;
recvbuf = mq->recvbuf->buf;
__flush_invalidate_region(sh_cacheop_vaddr(recvbuf),
0x400);
code = recvbuf[0];
kfree(mq->sendbuf);
list_del_init(&mq->list);
switch (code) {
case MAPLE_RESPONSE_NONE:
maple_response_none(mdev);
break;
case MAPLE_RESPONSE_DEVINFO:
maple_response_devinfo(mdev, recvbuf);
atomic_set(&mdev->busy, 0);
break;
case MAPLE_RESPONSE_DATATRF:
if (mdev->callback)
mdev->callback(mq);
atomic_set(&mdev->busy, 0);
wake_up(&mdev->maple_wait);
break;
case MAPLE_RESPONSE_FILEERR:
maple_response_fileerr(mdev, recvbuf);
atomic_set(&mdev->busy, 0);
wake_up(&mdev->maple_wait);
break;
case MAPLE_RESPONSE_AGAIN:
case MAPLE_RESPONSE_BADCMD:
case MAPLE_RESPONSE_BADFUNC:
dev_warn(&mdev->dev, "non-fatal error"
" 0x%X at (%d, %d)\n", code,
mdev->port, mdev->unit);
atomic_set(&mdev->busy, 0);
break;
case MAPLE_RESPONSE_ALLINFO:
dev_notice(&mdev->dev, "extended"
" device information request for (%d, %d)"
" but call is not supported\n", mdev->port,
mdev->unit);
atomic_set(&mdev->busy, 0);
break;
case MAPLE_RESPONSE_OK:
atomic_set(&mdev->busy, 0);
wake_up(&mdev->maple_wait);
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 */
started = 1;
}
maple_send();
}
static irqreturn_t maple_dma_interrupt(int irq, void *dev_id)
{
/* Load everything into the bottom half */
schedule_work(&maple_dma_process);
return IRQ_HANDLED;
}
static irqreturn_t maple_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, maple_dma_interrupt,
IRQF_SHARED, "maple bus DMA", &maple_unsupported_device);
}
static int maple_set_vblank_interrupt_handler(void)
{
return request_irq(HW_EVENT_VSYNC, maple_vblank_interrupt,
IRQF_SHARED, "maple bus VBLANK", &maple_unsupported_device);
}
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 maple_match_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_unsupported_device = {
.drv = {
.name = "maple_unsupported_device",
.bus = &maple_bus_type,
},
};
/*
* maple_bus_type - core maple bus structure
*/
struct bus_type maple_bus_type = {
.name = "maple",
.match = maple_match_bus_driver,
.uevent = maple_bus_uevent,
};
EXPORT_SYMBOL_GPL(maple_bus_type);
static struct device maple_bus = {
.init_name = "maple",
.release = maple_bus_release,
};
static int __init maple_bus_init(void)
{
int retval, i;
struct maple_device *mdev[MAPLE_PORTS];
__raw_writel(0, MAPLE_ENABLE);
retval = device_register(&maple_bus);
if (retval)
goto cleanup;
retval = bus_register(&maple_bus_type);
if (retval)
goto cleanup_device;
retval = driver_register(&maple_unsupported_device.drv);
if (retval)
goto cleanup_bus;
/* allocate memory for maple bus dma */
retval = maple_get_dma_buffer();
if (retval) {
dev_err(&maple_bus, "failed to allocate DMA buffers\n");
goto cleanup_basic;
}
/* set up DMA interrupt handler */
retval = maple_set_dma_interrupt_handler();
if (retval) {
dev_err(&maple_bus, "bus failed to grab maple "
"DMA IRQ\n");
goto cleanup_dma;
}
/* set up VBLANK interrupt handler */
retval = maple_set_vblank_interrupt_handler();
if (retval) {
dev_err(&maple_bus, "bus failed to grab VBLANK IRQ\n");
goto cleanup_irq;
}
maple_queue_cache = KMEM_CACHE(maple_buffer, SLAB_HWCACHE_ALIGN);
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;
empty[i] = false;
mdev[i] = maple_alloc_dev(i, 0);
if (!mdev[i]) {
while (i-- > 0)
maple_free_dev(mdev[i]);
goto cleanup_cache;
}
baseunits[i] = mdev[i];
atomic_set(&mdev[i]->busy, 1);
maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL);
subdevice_map[i] = 0;
}
maple_pnp_time = jiffies + HZ;
/* prepare initial queue */
maple_send();
dev_info(&maple_bus, "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_unsupported_device.drv);
cleanup_bus:
bus_unregister(&maple_bus_type);
cleanup_device:
device_unregister(&maple_bus);
cleanup:
printk(KERN_ERR "Maple bus registration failed\n");
return retval;
}
/* Push init to later to ensure hardware gets detected */
fs_initcall(maple_bus_init);
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