889 строки
21 KiB
C
889 строки
21 KiB
C
/*
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* Core maple bus functionality
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*
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* Copyright (C) 2007 - 2009 Adrian McMenamin
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* Copyright (C) 2001 - 2008 Paul Mundt
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* Copyright (C) 2000 - 2001 YAEGASHI Takeshi
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* Copyright (C) 2001 M. R. Brown
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/maple.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <asm/cacheflush.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <mach/dma.h>
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#include <mach/sysasic.h>
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MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
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MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
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MODULE_LICENSE("GPL v2");
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static void maple_dma_handler(struct work_struct *work);
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static void maple_vblank_handler(struct work_struct *work);
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static DECLARE_WORK(maple_dma_process, maple_dma_handler);
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static DECLARE_WORK(maple_vblank_process, maple_vblank_handler);
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static LIST_HEAD(maple_waitq);
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static LIST_HEAD(maple_sentq);
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/* mutex to protect queue of waiting packets */
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static DEFINE_MUTEX(maple_wlist_lock);
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static struct maple_driver maple_unsupported_device;
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static struct device maple_bus;
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static int subdevice_map[MAPLE_PORTS];
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static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr;
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static unsigned long maple_pnp_time;
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static int started, scanning, fullscan;
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static struct kmem_cache *maple_queue_cache;
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struct maple_device_specify {
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int port;
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int unit;
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};
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static bool checked[MAPLE_PORTS];
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static bool empty[MAPLE_PORTS];
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static struct maple_device *baseunits[MAPLE_PORTS];
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/**
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* maple_driver_register - register a maple driver
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* @drv: maple driver to be registered.
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*
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* Registers the passed in @drv, while updating the bus type.
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* Devices with matching function IDs will be automatically probed.
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*/
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int maple_driver_register(struct maple_driver *drv)
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{
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if (!drv)
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return -EINVAL;
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drv->drv.bus = &maple_bus_type;
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return driver_register(&drv->drv);
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}
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EXPORT_SYMBOL_GPL(maple_driver_register);
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/**
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* maple_driver_unregister - unregister a maple driver.
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* @drv: maple driver to unregister.
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*
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* Cleans up after maple_driver_register(). To be invoked in the exit
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* path of any module drivers.
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*/
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void maple_driver_unregister(struct maple_driver *drv)
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{
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driver_unregister(&drv->drv);
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}
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EXPORT_SYMBOL_GPL(maple_driver_unregister);
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/* set hardware registers to enable next round of dma */
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static void maple_dma_reset(void)
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{
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__raw_writel(MAPLE_MAGIC, MAPLE_RESET);
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/* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
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__raw_writel(1, MAPLE_TRIGTYPE);
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/*
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* Maple system register
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* bits 31 - 16 timeout in units of 20nsec
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* bit 12 hard trigger - set 0 to keep responding to VBLANK
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* bits 9 - 8 set 00 for 2 Mbps, 01 for 1 Mbps
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* bits 3 - 0 delay (in 1.3ms) between VBLANK and start of DMA
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* max delay is 11
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*/
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__raw_writel(MAPLE_2MBPS | MAPLE_TIMEOUT(0xFFFF), MAPLE_SPEED);
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__raw_writel(virt_to_phys(maple_sendbuf), MAPLE_DMAADDR);
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__raw_writel(1, MAPLE_ENABLE);
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}
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/**
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* maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND
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* @dev: device responding
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* @callback: handler callback
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* @interval: interval in jiffies between callbacks
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* @function: the function code for the device
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*/
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void maple_getcond_callback(struct maple_device *dev,
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void (*callback) (struct mapleq *mq),
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unsigned long interval, unsigned long function)
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{
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dev->callback = callback;
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dev->interval = interval;
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dev->function = cpu_to_be32(function);
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dev->when = jiffies;
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}
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EXPORT_SYMBOL_GPL(maple_getcond_callback);
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static int maple_dma_done(void)
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{
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return (__raw_readl(MAPLE_STATE) & 1) == 0;
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}
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static void maple_release_device(struct device *dev)
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{
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struct maple_device *mdev;
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struct mapleq *mq;
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mdev = to_maple_dev(dev);
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mq = mdev->mq;
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kmem_cache_free(maple_queue_cache, mq->recvbuf);
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kfree(mq);
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kfree(mdev);
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}
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/**
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* maple_add_packet - add a single instruction to the maple bus queue
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* @mdev: maple device
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* @function: function on device being queried
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* @command: maple command to add
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* @length: length of command string (in 32 bit words)
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* @data: remainder of command string
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*/
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int maple_add_packet(struct maple_device *mdev, u32 function, u32 command,
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size_t length, void *data)
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{
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int ret = 0;
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void *sendbuf = NULL;
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if (length) {
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sendbuf = kcalloc(length, 4, GFP_KERNEL);
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if (!sendbuf) {
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ret = -ENOMEM;
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goto out;
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}
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((__be32 *)sendbuf)[0] = cpu_to_be32(function);
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}
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mdev->mq->command = command;
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mdev->mq->length = length;
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if (length > 1)
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memcpy(sendbuf + 4, data, (length - 1) * 4);
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mdev->mq->sendbuf = sendbuf;
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mutex_lock(&maple_wlist_lock);
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list_add_tail(&mdev->mq->list, &maple_waitq);
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mutex_unlock(&maple_wlist_lock);
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(maple_add_packet);
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static struct mapleq *maple_allocq(struct maple_device *mdev)
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{
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struct mapleq *mq;
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mq = kzalloc(sizeof(*mq), GFP_KERNEL);
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if (!mq)
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goto failed_nomem;
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INIT_LIST_HEAD(&mq->list);
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mq->dev = mdev;
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mq->recvbuf = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
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if (!mq->recvbuf)
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goto failed_p2;
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mq->recvbuf->buf = &((mq->recvbuf->bufx)[0]);
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return mq;
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failed_p2:
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kfree(mq);
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failed_nomem:
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dev_err(&mdev->dev, "could not allocate memory for device (%d, %d)\n",
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mdev->port, mdev->unit);
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return NULL;
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}
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static struct maple_device *maple_alloc_dev(int port, int unit)
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{
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struct maple_device *mdev;
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/* zero this out to avoid kobj subsystem
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* thinking it has already been registered */
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mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
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if (!mdev)
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return NULL;
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mdev->port = port;
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mdev->unit = unit;
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mdev->mq = maple_allocq(mdev);
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if (!mdev->mq) {
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kfree(mdev);
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return NULL;
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}
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mdev->dev.bus = &maple_bus_type;
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mdev->dev.parent = &maple_bus;
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init_waitqueue_head(&mdev->maple_wait);
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return mdev;
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}
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static void maple_free_dev(struct maple_device *mdev)
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{
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kmem_cache_free(maple_queue_cache, mdev->mq->recvbuf);
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kfree(mdev->mq);
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kfree(mdev);
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}
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/* process the command queue into a maple command block
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* terminating command has bit 32 of first long set to 0
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*/
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static void maple_build_block(struct mapleq *mq)
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{
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int port, unit, from, to, len;
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unsigned long *lsendbuf = mq->sendbuf;
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port = mq->dev->port & 3;
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unit = mq->dev->unit;
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len = mq->length;
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from = port << 6;
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to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20);
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*maple_lastptr &= 0x7fffffff;
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maple_lastptr = maple_sendptr;
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*maple_sendptr++ = (port << 16) | len | 0x80000000;
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*maple_sendptr++ = virt_to_phys(mq->recvbuf->buf);
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*maple_sendptr++ =
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mq->command | (to << 8) | (from << 16) | (len << 24);
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while (len-- > 0)
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*maple_sendptr++ = *lsendbuf++;
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}
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/* build up command queue */
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static void maple_send(void)
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{
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int i, maple_packets = 0;
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struct mapleq *mq, *nmq;
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if (!maple_dma_done())
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return;
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/* disable DMA */
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__raw_writel(0, MAPLE_ENABLE);
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if (!list_empty(&maple_sentq))
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goto finish;
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mutex_lock(&maple_wlist_lock);
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if (list_empty(&maple_waitq)) {
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mutex_unlock(&maple_wlist_lock);
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goto finish;
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}
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maple_lastptr = maple_sendbuf;
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maple_sendptr = maple_sendbuf;
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list_for_each_entry_safe(mq, nmq, &maple_waitq, list) {
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maple_build_block(mq);
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list_del_init(&mq->list);
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list_add_tail(&mq->list, &maple_sentq);
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if (maple_packets++ > MAPLE_MAXPACKETS)
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break;
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}
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mutex_unlock(&maple_wlist_lock);
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if (maple_packets > 0) {
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for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
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__flush_purge_region(maple_sendbuf + i * PAGE_SIZE,
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PAGE_SIZE);
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}
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finish:
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maple_dma_reset();
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}
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/* check if there is a driver registered likely to match this device */
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static int maple_check_matching_driver(struct device_driver *driver,
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void *devptr)
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{
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struct maple_driver *maple_drv;
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struct maple_device *mdev;
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mdev = devptr;
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maple_drv = to_maple_driver(driver);
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if (mdev->devinfo.function & cpu_to_be32(maple_drv->function))
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return 1;
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return 0;
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}
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static void maple_detach_driver(struct maple_device *mdev)
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{
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device_unregister(&mdev->dev);
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}
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/* process initial MAPLE_COMMAND_DEVINFO for each device or port */
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static void maple_attach_driver(struct maple_device *mdev)
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{
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char *p, *recvbuf;
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unsigned long function;
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int matched, error;
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recvbuf = mdev->mq->recvbuf->buf;
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/* copy the data as individual elements in
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* case of memory optimisation */
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memcpy(&mdev->devinfo.function, recvbuf + 4, 4);
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memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12);
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memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1);
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memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1);
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memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30);
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memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2);
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memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2);
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memcpy(mdev->product_name, mdev->devinfo.product_name, 30);
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mdev->product_name[30] = '\0';
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memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60);
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mdev->product_licence[60] = '\0';
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for (p = mdev->product_name + 29; mdev->product_name <= p; p--)
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if (*p == ' ')
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*p = '\0';
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else
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break;
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for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--)
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if (*p == ' ')
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*p = '\0';
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else
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break;
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function = be32_to_cpu(mdev->devinfo.function);
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dev_info(&mdev->dev, "detected %s: function 0x%lX: at (%d, %d)\n",
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mdev->product_name, function, mdev->port, mdev->unit);
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if (function > 0x200) {
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/* Do this silently - as not a real device */
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function = 0;
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mdev->driver = &maple_unsupported_device;
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dev_set_name(&mdev->dev, "%d:0.port", mdev->port);
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} else {
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matched =
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bus_for_each_drv(&maple_bus_type, NULL, mdev,
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maple_check_matching_driver);
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if (matched == 0) {
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/* Driver does not exist yet */
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dev_info(&mdev->dev, "no driver found\n");
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mdev->driver = &maple_unsupported_device;
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}
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dev_set_name(&mdev->dev, "%d:0%d.%lX", mdev->port,
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mdev->unit, function);
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}
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mdev->function = function;
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mdev->dev.release = &maple_release_device;
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atomic_set(&mdev->busy, 0);
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error = device_register(&mdev->dev);
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if (error) {
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dev_warn(&mdev->dev, "could not register device at"
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" (%d, %d), with error 0x%X\n", mdev->unit,
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mdev->port, error);
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maple_free_dev(mdev);
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mdev = NULL;
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return;
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}
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}
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/*
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* if device has been registered for the given
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* port and unit then return 1 - allows identification
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* of which devices need to be attached or detached
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*/
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static int check_maple_device(struct device *device, void *portptr)
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{
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struct maple_device_specify *ds;
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struct maple_device *mdev;
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ds = portptr;
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mdev = to_maple_dev(device);
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if (mdev->port == ds->port && mdev->unit == ds->unit)
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return 1;
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return 0;
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}
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static int setup_maple_commands(struct device *device, void *ignored)
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{
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int add;
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struct maple_device *mdev = to_maple_dev(device);
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if (mdev->interval > 0 && atomic_read(&mdev->busy) == 0 &&
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time_after(jiffies, mdev->when)) {
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/* bounce if we cannot add */
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add = maple_add_packet(mdev,
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be32_to_cpu(mdev->devinfo.function),
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MAPLE_COMMAND_GETCOND, 1, NULL);
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if (!add)
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mdev->when = jiffies + mdev->interval;
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} else {
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if (time_after(jiffies, maple_pnp_time))
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/* Ensure we don't have block reads and devinfo
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* calls interfering with one another - so flag the
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* device as busy */
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if (atomic_read(&mdev->busy) == 0) {
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atomic_set(&mdev->busy, 1);
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maple_add_packet(mdev, 0,
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MAPLE_COMMAND_DEVINFO, 0, NULL);
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}
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}
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return 0;
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}
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/* VBLANK bottom half - implemented via workqueue */
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static void maple_vblank_handler(struct work_struct *work)
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{
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int x, locking;
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struct maple_device *mdev;
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if (!maple_dma_done())
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return;
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__raw_writel(0, MAPLE_ENABLE);
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if (!list_empty(&maple_sentq))
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goto finish;
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/*
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* Set up essential commands - to fetch data and
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* check devices are still present
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*/
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bus_for_each_dev(&maple_bus_type, NULL, NULL,
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setup_maple_commands);
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if (time_after(jiffies, maple_pnp_time)) {
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/*
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* Scan the empty ports - bus is flakey and may have
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* mis-reported emptyness
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*/
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for (x = 0; x < MAPLE_PORTS; x++) {
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if (checked[x] && empty[x]) {
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mdev = baseunits[x];
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if (!mdev)
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break;
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atomic_set(&mdev->busy, 1);
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locking = maple_add_packet(mdev, 0,
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MAPLE_COMMAND_DEVINFO, 0, NULL);
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if (!locking)
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break;
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}
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}
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maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
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}
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finish:
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maple_send();
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}
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/* handle devices added via hotplugs - placing them on queue for DEVINFO */
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static void maple_map_subunits(struct maple_device *mdev, int submask)
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{
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int retval, k, devcheck;
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struct maple_device *mdev_add;
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struct maple_device_specify ds;
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ds.port = mdev->port;
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for (k = 0; k < 5; k++) {
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ds.unit = k + 1;
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retval =
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bus_for_each_dev(&maple_bus_type, NULL, &ds,
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check_maple_device);
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if (retval) {
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submask = submask >> 1;
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continue;
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}
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devcheck = submask & 0x01;
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if (devcheck) {
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mdev_add = maple_alloc_dev(mdev->port, k + 1);
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if (!mdev_add)
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return;
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atomic_set(&mdev_add->busy, 1);
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maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO,
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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 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,
|
|
};
|
|
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);
|