656e608747
The uevent API has changed from 2.6.22 and this patch eliminates annoying compiler errors Signed off by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
734 lines
21 KiB
C
734 lines
21 KiB
C
/*
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* Core maple bus functionality
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*
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* Copyright (C) 2007 Adrian McMenamin
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*
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* Based on 2.4 code by:
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*
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* Copyright (C) 2000-2001 YAEGASHI Takeshi
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* Copyright (C) 2001 M. R. Brown
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* Copyright (C) 2001 Paul Mundt
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*
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* and others.
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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/module.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 <asm/cacheflush.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/mach/dma.h>
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#include <asm/mach/sysasic.h>
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#include <asm/mach/maple.h>
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MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin");
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MODULE_DESCRIPTION("Maple bus driver for Dreamcast");
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MODULE_LICENSE("GPL v2");
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MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}");
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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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static DEFINE_MUTEX(maple_list_lock);
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static struct maple_driver maple_dummy_driver;
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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, liststatus;
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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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/**
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* maple_driver_register - register a device driver
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* automatically makes the driver bus a maple bus
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* @drv: the driver to be registered
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*/
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int maple_driver_register(struct device_driver *drv)
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{
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if (!drv)
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return -EINVAL;
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drv->bus = &maple_bus_type;
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return driver_register(drv);
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}
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EXPORT_SYMBOL_GPL(maple_driver_register);
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/* set hardware registers to enable next round of dma */
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static void maplebus_dma_reset(void)
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{
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ctrl_outl(MAPLE_MAGIC, MAPLE_RESET);
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/* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */
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ctrl_outl(1, MAPLE_TRIGTYPE);
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ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED);
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ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR);
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ctrl_outl(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 (ctrl_inl(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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if (dev->type) {
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kfree(dev->type->name);
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kfree(dev->type);
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}
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}
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/**
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* maple_add_packet - add a single instruction to the queue
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* @mq: instruction to add to waiting queue
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*/
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void maple_add_packet(struct mapleq *mq)
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{
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mutex_lock(&maple_list_lock);
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list_add(&mq->list, &maple_waitq);
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mutex_unlock(&maple_list_lock);
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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 *dev)
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{
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struct mapleq *mq;
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mq = kmalloc(sizeof(*mq), GFP_KERNEL);
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if (!mq)
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return NULL;
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mq->dev = dev;
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mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL);
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mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp);
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if (!mq->recvbuf) {
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kfree(mq);
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return NULL;
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}
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return mq;
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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 *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->port = port;
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dev->unit = unit;
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dev->mq = maple_allocq(dev);
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if (!dev->mq) {
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kfree(dev);
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return NULL;
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}
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return dev;
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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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if (!mdev)
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return;
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if (mdev->mq) {
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kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp);
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kfree(mdev->mq);
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}
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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++ = PHYSADDR(mq->recvbuf);
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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;
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int maple_packets;
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struct mapleq *mq, *nmq;
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if (!list_empty(&maple_sentq))
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return;
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if (list_empty(&maple_waitq) || !maple_dma_done())
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return;
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maple_packets = 0;
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maple_sendptr = maple_lastptr = 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_move(&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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if (maple_packets > 0) {
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for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++)
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dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE,
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PAGE_SIZE, DMA_BIDIRECTIONAL);
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}
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}
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static int attach_matching_maple_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 & be32_to_cpu(maple_drv->function)) {
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if (maple_drv->connect(mdev) == 0) {
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mdev->driver = maple_drv;
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return 1;
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}
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}
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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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if (!mdev)
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return;
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if (mdev->driver) {
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if (mdev->driver->disconnect)
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mdev->driver->disconnect(mdev);
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}
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mdev->driver = NULL;
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if (mdev->registered) {
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maple_release_device(&mdev->dev);
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device_unregister(&mdev->dev);
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}
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mdev->registered = 0;
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maple_free_dev(mdev);
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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 *dev)
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{
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char *p;
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char *recvbuf;
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unsigned long function;
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int matched, retval;
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recvbuf = dev->mq->recvbuf;
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memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo));
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memcpy(dev->product_name, dev->devinfo.product_name, 30);
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memcpy(dev->product_licence, dev->devinfo.product_licence, 60);
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dev->product_name[30] = '\0';
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dev->product_licence[60] = '\0';
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for (p = dev->product_name + 29; dev->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 = dev->product_licence + 59; dev->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(dev->devinfo.function);
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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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dev->driver = &maple_dummy_driver;
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sprintf(dev->dev.bus_id, "%d:0.port", dev->port);
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} else {
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printk(KERN_INFO
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"Maple bus at (%d, %d): Connected function 0x%lX\n",
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dev->port, dev->unit, function);
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matched =
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bus_for_each_drv(&maple_bus_type, NULL, dev,
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attach_matching_maple_driver);
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if (matched == 0) {
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/* Driver does not exist yet */
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printk(KERN_INFO
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"No maple driver found for this device\n");
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dev->driver = &maple_dummy_driver;
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}
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sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port,
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dev->unit, function);
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}
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dev->function = function;
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dev->dev.bus = &maple_bus_type;
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dev->dev.parent = &maple_bus;
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dev->dev.release = &maple_release_device;
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retval = device_register(&dev->dev);
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if (retval) {
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printk(KERN_INFO
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"Maple bus: Attempt to register device (%x, %x) failed.\n",
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dev->port, dev->unit);
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maple_free_dev(dev);
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}
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dev->registered = 1;
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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 detach_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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struct maple_device *maple_dev = to_maple_dev(device);
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if ((maple_dev->interval > 0)
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&& time_after(jiffies, maple_dev->when)) {
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maple_dev->when = jiffies + maple_dev->interval;
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maple_dev->mq->command = MAPLE_COMMAND_GETCOND;
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maple_dev->mq->sendbuf = &maple_dev->function;
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maple_dev->mq->length = 1;
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maple_add_packet(maple_dev->mq);
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liststatus++;
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} else {
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if (time_after(jiffies, maple_pnp_time)) {
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maple_dev->mq->command = MAPLE_COMMAND_DEVINFO;
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maple_dev->mq->length = 0;
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maple_add_packet(maple_dev->mq);
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liststatus++;
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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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if (!maple_dma_done())
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return;
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if (!list_empty(&maple_sentq))
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return;
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ctrl_outl(0, MAPLE_ENABLE);
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liststatus = 0;
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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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maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL;
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if (liststatus && list_empty(&maple_sentq)) {
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INIT_LIST_HEAD(&maple_sentq);
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maple_send();
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}
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maplebus_dma_reset();
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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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for (k = 0; k < 5; k++) {
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ds.port = mdev->port;
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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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detach_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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mdev_add->mq->command = MAPLE_COMMAND_DEVINFO;
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mdev_add->mq->length = 0;
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maple_add_packet(mdev_add->mq);
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scanning = 1;
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}
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submask = submask >> 1;
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}
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}
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/* mark a device as removed */
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static void maple_clean_submap(struct maple_device *mdev)
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{
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int killbit;
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killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20);
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killbit = ~killbit;
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killbit &= 0xFF;
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subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit;
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}
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/* handle empty port or hotplug removal */
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static void maple_response_none(struct maple_device *mdev,
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struct mapleq *mq)
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{
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if (mdev->unit != 0) {
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list_del(&mq->list);
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maple_clean_submap(mdev);
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printk(KERN_INFO
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"Maple bus device detaching at (%d, %d)\n",
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mdev->port, mdev->unit);
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maple_detach_driver(mdev);
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return;
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}
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if (!started) {
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printk(KERN_INFO "No maple devices attached to port %d\n",
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mdev->port);
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return;
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}
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maple_clean_submap(mdev);
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}
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/* preprocess hotplugs or scans */
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static void maple_response_devinfo(struct maple_device *mdev,
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char *recvbuf)
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{
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char submask;
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if ((!started) || (scanning == 2)) {
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maple_attach_driver(mdev);
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return;
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}
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if (mdev->unit == 0) {
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submask = recvbuf[2] & 0x1F;
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if (submask ^ subdevice_map[mdev->port]) {
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maple_map_subunits(mdev, submask);
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subdevice_map[mdev->port] = submask;
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}
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}
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}
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/* maple dma end bottom half - implemented via workqueue */
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static void maple_dma_handler(struct work_struct *work)
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{
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struct mapleq *mq, *nmq;
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struct maple_device *dev;
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char *recvbuf;
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enum maple_code code;
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if (!maple_dma_done())
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return;
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ctrl_outl(0, MAPLE_ENABLE);
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if (!list_empty(&maple_sentq)) {
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list_for_each_entry_safe(mq, nmq, &maple_sentq, list) {
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recvbuf = mq->recvbuf;
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code = recvbuf[0];
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dev = mq->dev;
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switch (code) {
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case MAPLE_RESPONSE_NONE:
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maple_response_none(dev, mq);
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break;
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case MAPLE_RESPONSE_DEVINFO:
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maple_response_devinfo(dev, recvbuf);
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break;
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case MAPLE_RESPONSE_DATATRF:
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if (dev->callback)
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dev->callback(mq);
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break;
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case MAPLE_RESPONSE_FILEERR:
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case MAPLE_RESPONSE_AGAIN:
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case MAPLE_RESPONSE_BADCMD:
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case MAPLE_RESPONSE_BADFUNC:
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printk(KERN_DEBUG
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"Maple non-fatal error 0x%X\n",
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code);
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break;
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case MAPLE_RESPONSE_ALLINFO:
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printk(KERN_DEBUG
|
|
"Maple - extended device information not supported\n");
|
|
break;
|
|
|
|
case MAPLE_RESPONSE_OK:
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
INIT_LIST_HEAD(&maple_sentq);
|
|
if (scanning == 1) {
|
|
maple_send();
|
|
scanning = 2;
|
|
} else
|
|
scanning = 0;
|
|
|
|
if (started == 0)
|
|
started = 1;
|
|
}
|
|
maplebus_dma_reset();
|
|
}
|
|
|
|
static irqreturn_t maplebus_dma_interrupt(int irq, void *dev_id)
|
|
{
|
|
/* Load everything into the bottom half */
|
|
schedule_work(&maple_dma_process);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t maplebus_vblank_interrupt(int irq, void *dev_id)
|
|
{
|
|
schedule_work(&maple_vblank_process);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction maple_dma_irq = {
|
|
.name = "maple bus DMA handler",
|
|
.handler = maplebus_dma_interrupt,
|
|
.flags = IRQF_SHARED,
|
|
};
|
|
|
|
static struct irqaction maple_vblank_irq = {
|
|
.name = "maple bus VBLANK handler",
|
|
.handler = maplebus_vblank_interrupt,
|
|
.flags = IRQF_SHARED,
|
|
};
|
|
|
|
static int maple_set_dma_interrupt_handler(void)
|
|
{
|
|
return setup_irq(HW_EVENT_MAPLE_DMA, &maple_dma_irq);
|
|
}
|
|
|
|
static int maple_set_vblank_interrupt_handler(void)
|
|
{
|
|
return setup_irq(HW_EVENT_VSYNC, &maple_vblank_irq);
|
|
}
|
|
|
|
static int maple_get_dma_buffer(void)
|
|
{
|
|
maple_sendbuf =
|
|
(void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
MAPLE_DMA_PAGES);
|
|
if (!maple_sendbuf)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int match_maple_bus_driver(struct device *devptr,
|
|
struct device_driver *drvptr)
|
|
{
|
|
struct maple_driver *maple_drv;
|
|
struct maple_device *maple_dev;
|
|
|
|
maple_drv = container_of(drvptr, struct maple_driver, drv);
|
|
maple_dev = container_of(devptr, struct maple_device, dev);
|
|
/* Trap empty port case */
|
|
if (maple_dev->devinfo.function == 0xFFFFFFFF)
|
|
return 0;
|
|
else if (maple_dev->devinfo.function &
|
|
be32_to_cpu(maple_drv->function))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int maple_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void maple_bus_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static struct maple_driver maple_dummy_driver = {
|
|
.drv = {
|
|
.name = "maple_dummy_driver",
|
|
.bus = &maple_bus_type,
|
|
},
|
|
};
|
|
|
|
struct bus_type maple_bus_type = {
|
|
.name = "maple",
|
|
.match = match_maple_bus_driver,
|
|
.uevent = maple_bus_uevent,
|
|
};
|
|
EXPORT_SYMBOL_GPL(maple_bus_type);
|
|
|
|
static struct device maple_bus = {
|
|
.bus_id = "maple",
|
|
.release = maple_bus_release,
|
|
};
|
|
|
|
static int __init maple_bus_init(void)
|
|
{
|
|
int retval, i;
|
|
struct maple_device *mdev[MAPLE_PORTS];
|
|
ctrl_outl(0, MAPLE_STATE);
|
|
|
|
retval = device_register(&maple_bus);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
retval = bus_register(&maple_bus_type);
|
|
if (retval)
|
|
goto cleanup_device;
|
|
|
|
retval = driver_register(&maple_dummy_driver.drv);
|
|
|
|
if (retval)
|
|
goto cleanup_bus;
|
|
|
|
/* allocate memory for maple bus dma */
|
|
retval = maple_get_dma_buffer();
|
|
if (retval) {
|
|
printk(KERN_INFO
|
|
"Maple bus: Failed to allocate Maple DMA buffers\n");
|
|
goto cleanup_basic;
|
|
}
|
|
|
|
/* set up DMA interrupt handler */
|
|
retval = maple_set_dma_interrupt_handler();
|
|
if (retval) {
|
|
printk(KERN_INFO
|
|
"Maple bus: Failed to grab maple DMA IRQ\n");
|
|
goto cleanup_dma;
|
|
}
|
|
|
|
/* set up VBLANK interrupt handler */
|
|
retval = maple_set_vblank_interrupt_handler();
|
|
if (retval) {
|
|
printk(KERN_INFO "Maple bus: Failed to grab VBLANK IRQ\n");
|
|
goto cleanup_irq;
|
|
}
|
|
|
|
maple_queue_cache =
|
|
kmem_cache_create("maple_queue_cache", 0x400, 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
|
|
if (!maple_queue_cache)
|
|
goto cleanup_bothirqs;
|
|
|
|
/* setup maple ports */
|
|
for (i = 0; i < MAPLE_PORTS; i++) {
|
|
mdev[i] = maple_alloc_dev(i, 0);
|
|
if (!mdev[i]) {
|
|
while (i-- > 0)
|
|
maple_free_dev(mdev[i]);
|
|
goto cleanup_cache;
|
|
}
|
|
mdev[i]->registered = 0;
|
|
mdev[i]->mq->command = MAPLE_COMMAND_DEVINFO;
|
|
mdev[i]->mq->length = 0;
|
|
maple_attach_driver(mdev[i]);
|
|
maple_add_packet(mdev[i]->mq);
|
|
subdevice_map[i] = 0;
|
|
}
|
|
|
|
/* setup maplebus hardware */
|
|
maplebus_dma_reset();
|
|
|
|
/* initial detection */
|
|
maple_send();
|
|
|
|
maple_pnp_time = jiffies;
|
|
|
|
printk(KERN_INFO "Maple bus core now registered.\n");
|
|
|
|
return 0;
|
|
|
|
cleanup_cache:
|
|
kmem_cache_destroy(maple_queue_cache);
|
|
|
|
cleanup_bothirqs:
|
|
free_irq(HW_EVENT_VSYNC, 0);
|
|
|
|
cleanup_irq:
|
|
free_irq(HW_EVENT_MAPLE_DMA, 0);
|
|
|
|
cleanup_dma:
|
|
free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES);
|
|
|
|
cleanup_basic:
|
|
driver_unregister(&maple_dummy_driver.drv);
|
|
|
|
cleanup_bus:
|
|
bus_unregister(&maple_bus_type);
|
|
|
|
cleanup_device:
|
|
device_unregister(&maple_bus);
|
|
|
|
cleanup:
|
|
printk(KERN_INFO "Maple bus registration failed\n");
|
|
return retval;
|
|
}
|
|
subsys_initcall(maple_bus_init);
|