Orange Pi5 kernel

/*
 * 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) {
<------><------>retval = -ENOMEM;
<------><------>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]);
<------><------><------>retval = -ENOMEM;
<------><------><------>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);