diff options
Diffstat (limited to 'drivers/sh/maple/maple.c')
| -rw-r--r-- | drivers/sh/maple/maple.c | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/drivers/sh/maple/maple.c b/drivers/sh/maple/maple.c new file mode 100644 index 00000000000..161d1021b7e --- /dev/null +++ b/drivers/sh/maple/maple.c @@ -0,0 +1,735 @@ +/* + * Core maple bus functionality + * + * Copyright (C) 2007 Adrian McMenamin + * + * Based on 2.4 code by: + * + * Copyright (C) 2000-2001 YAEGASHI Takeshi + * Copyright (C) 2001 M. R. Brown + * Copyright (C) 2001 Paul Mundt + * + * and others. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/module.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 <asm/cacheflush.h> +#include <asm/dma.h> +#include <asm/io.h> +#include <asm/mach/dma.h> +#include <asm/mach/sysasic.h> +#include <asm/mach/maple.h> + +MODULE_AUTHOR("Yaegshi Takeshi, Paul Mundt, M.R. Brown, Adrian McMenamin"); +MODULE_DESCRIPTION("Maple bus driver for Dreamcast"); +MODULE_LICENSE("GPL v2"); +MODULE_SUPPORTED_DEVICE("{{SEGA, Dreamcast/Maple}}"); + +static void maple_dma_handler(struct work_struct *work); +static void maple_vblank_handler(struct work_struct *work); + +static DECLARE_WORK(maple_dma_process, maple_dma_handler); +static DECLARE_WORK(maple_vblank_process, maple_vblank_handler); + +static LIST_HEAD(maple_waitq); +static LIST_HEAD(maple_sentq); + +static DEFINE_MUTEX(maple_list_lock); + +static struct maple_driver maple_dummy_driver; +static struct device maple_bus; +static int subdevice_map[MAPLE_PORTS]; +static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr; +static unsigned long maple_pnp_time; +static int started, scanning, liststatus; +static struct kmem_cache *maple_queue_cache; + +struct maple_device_specify { + int port; + int unit; +}; + +/** + * maple_driver_register - register a device driver + * automatically makes the driver bus a maple bus + * @drv: the driver to be registered + */ +int maple_driver_register(struct device_driver *drv) +{ + if (!drv) + return -EINVAL; + drv->bus = &maple_bus_type; + return driver_register(drv); +} +EXPORT_SYMBOL_GPL(maple_driver_register); + +/* set hardware registers to enable next round of dma */ +static void maplebus_dma_reset(void) +{ + ctrl_outl(MAPLE_MAGIC, MAPLE_RESET); + /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */ + ctrl_outl(1, MAPLE_TRIGTYPE); + ctrl_outl(MAPLE_2MBPS | MAPLE_TIMEOUT(50000), MAPLE_SPEED); + ctrl_outl(PHYSADDR(maple_sendbuf), MAPLE_DMAADDR); + ctrl_outl(1, MAPLE_ENABLE); +} + +/** + * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND + * @dev: device responding + * @callback: handler callback + * @interval: interval in jiffies between callbacks + * @function: the function code for the device + */ +void maple_getcond_callback(struct maple_device *dev, + void (*callback) (struct mapleq * mq), + unsigned long interval, unsigned long function) +{ + dev->callback = callback; + dev->interval = interval; + dev->function = cpu_to_be32(function); + dev->when = jiffies; +} +EXPORT_SYMBOL_GPL(maple_getcond_callback); + +static int maple_dma_done(void) +{ + return (ctrl_inl(MAPLE_STATE) & 1) == 0; +} + +static void maple_release_device(struct device *dev) +{ + if (dev->type) { + kfree(dev->type->name); + kfree(dev->type); + } +} + +/** + * maple_add_packet - add a single instruction to the queue + * @mq: instruction to add to waiting queue + */ +void maple_add_packet(struct mapleq *mq) +{ + mutex_lock(&maple_list_lock); + list_add(&mq->list, &maple_waitq); + mutex_unlock(&maple_list_lock); +} +EXPORT_SYMBOL_GPL(maple_add_packet); + +static struct mapleq *maple_allocq(struct maple_device *dev) +{ + struct mapleq *mq; + + mq = kmalloc(sizeof(*mq), GFP_KERNEL); + if (!mq) + return NULL; + + mq->dev = dev; + mq->recvbufdcsp = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL); + mq->recvbuf = (void *) P2SEGADDR(mq->recvbufdcsp); + if (!mq->recvbuf) { + kfree(mq); + return NULL; + } + + return mq; +} + +static struct maple_device *maple_alloc_dev(int port, int unit) +{ + struct maple_device *dev; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + dev->port = port; + dev->unit = unit; + dev->mq = maple_allocq(dev); + + if (!dev->mq) { + kfree(dev); + return NULL; + } + + return dev; +} + +static void maple_free_dev(struct maple_device *mdev) +{ + if (!mdev) + return; + if (mdev->mq) { + kmem_cache_free(maple_queue_cache, mdev->mq->recvbufdcsp); + kfree(mdev->mq); + } + kfree(mdev); +} + +/* process the command queue into a maple command block + * terminating command has bit 32 of first long set to 0 + */ +static void maple_build_block(struct mapleq *mq) +{ + int port, unit, from, to, len; + unsigned long *lsendbuf = mq->sendbuf; + + port = mq->dev->port & 3; + unit = mq->dev->unit; + len = mq->length; + from = port << 6; + to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20); + + *maple_lastptr &= 0x7fffffff; + maple_lastptr = maple_sendptr; + + *maple_sendptr++ = (port << 16) | len | 0x80000000; + *maple_sendptr++ = PHYSADDR(mq->recvbuf); + *maple_sendptr++ = + mq->command | (to << 8) | (from << 16) | (len << 24); + + while (len-- > 0) + *maple_sendptr++ = *lsendbuf++; +} + +/* build up command queue */ +static void maple_send(void) +{ + int i; + int maple_packets; + struct mapleq *mq, *nmq; + + if (!list_empty(&maple_sentq)) + return; + if (list_empty(&maple_waitq) || !maple_dma_done()) + return; + maple_packets = 0; + maple_sendptr = maple_lastptr = maple_sendbuf; + list_for_each_entry_safe(mq, nmq, &maple_waitq, list) { + maple_build_block(mq); + list_move(&mq->list, &maple_sentq); + if (maple_packets++ > MAPLE_MAXPACKETS) + break; + } + if (maple_packets > 0) { + for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++) + dma_cache_sync(0, maple_sendbuf + i * PAGE_SIZE, + PAGE_SIZE, DMA_BIDIRECTIONAL); + } +} + +static int attach_matching_maple_driver(struct device_driver *driver, + void *devptr) +{ + struct maple_driver *maple_drv; + struct maple_device *mdev; + + mdev = devptr; + maple_drv = to_maple_driver(driver); + if (mdev->devinfo.function & be32_to_cpu(maple_drv->function)) { + if (maple_drv->connect(mdev) == 0) { + mdev->driver = maple_drv; + return 1; + } + } + return 0; +} + +static void maple_detach_driver(struct maple_device *mdev) +{ + if (!mdev) + return; + if (mdev->driver) { + if (mdev->driver->disconnect) + mdev->driver->disconnect(mdev); + } + mdev->driver = NULL; + if (mdev->registered) { + maple_release_device(&mdev->dev); + device_unregister(&mdev->dev); + } + mdev->registered = 0; + maple_free_dev(mdev); +} + +/* process initial MAPLE_COMMAND_DEVINFO for each device or port */ +static void maple_attach_driver(struct maple_device *dev) +{ + char *p; + + char *recvbuf; + unsigned long function; + int matched, retval; + + recvbuf = dev->mq->recvbuf; + memcpy(&dev->devinfo, recvbuf + 4, sizeof(dev->devinfo)); + memcpy(dev->product_name, dev->devinfo.product_name, 30); + memcpy(dev->product_licence, dev->devinfo.product_licence, 60); + dev->product_name[30] = '\0'; + dev->product_licence[60] = '\0'; + + for (p = dev->product_name + 29; dev->product_name <= p; p--) + if (*p == ' ') + *p = '\0'; + else + break; + + for (p = dev->product_licence + 59; dev->product_licence <= p; p--) + if (*p == ' ') + *p = '\0'; + else + break; + + function = be32_to_cpu(dev->devinfo.function); + + if (function > 0x200) { + /* Do this silently - as not a real device */ + function = 0; + dev->driver = &maple_dummy_driver; + sprintf(dev->dev.bus_id, "%d:0.port", dev->port); + } else { + printk(KERN_INFO + "Maple bus at (%d, %d): Connected function 0x%lX\n", + dev->port, dev->unit, function); + + matched = + bus_for_each_drv(&maple_bus_type, NULL, dev, + attach_matching_maple_driver); + + if (matched == 0) { + /* Driver does not exist yet */ + printk(KERN_INFO + "No maple driver found for this device\n"); + dev->driver = &maple_dummy_driver; + } + + sprintf(dev->dev.bus_id, "%d:0%d.%lX", dev->port, + dev->unit, function); + } + dev->function = function; + dev->dev.bus = &maple_bus_type; + dev->dev.parent = &maple_bus; + dev->dev.release = &maple_release_device; + retval = device_register(&dev->dev); + if (retval) { + printk(KERN_INFO + "Maple bus: Attempt to register device (%x, %x) failed.\n", + dev->port, dev->unit); + maple_free_dev(dev); + } + dev->registered = 1; +} + +/* + * if device has been registered for the given + * port and unit then return 1 - allows identification + * of which devices need to be attached or detached + */ +static int detach_maple_device(struct device *device, void *portptr) +{ + struct maple_device_specify *ds; + struct maple_device *mdev; + + ds = portptr; + mdev = to_maple_dev(device); + if (mdev->port == ds->port && mdev->unit == ds->unit) + return 1; + return 0; +} + +static int setup_maple_commands(struct device *device, void *ignored) +{ + struct maple_device *maple_dev = to_maple_dev(device); + + if ((maple_dev->interval > 0) + && time_after(jiffies, maple_dev->when)) { + maple_dev->when = jiffies + maple_dev->interval; + maple_dev->mq->command = MAPLE_COMMAND_GETCOND; + maple_dev->mq->sendbuf = &maple_dev->function; + maple_dev->mq->length = 1; + maple_add_packet(maple_dev->mq); + liststatus++; + } else { + if (time_after(jiffies, maple_pnp_time)) { + maple_dev->mq->command = MAPLE_COMMAND_DEVINFO; + maple_dev->mq->length = 0; + maple_add_packet(maple_dev->mq); + liststatus++; + } + } + + return 0; +} + +/* VBLANK bottom half - implemented via workqueue */ +static void maple_vblank_handler(struct work_struct *work) +{ + if (!maple_dma_done()) + return; + if (!list_empty(&maple_sentq)) + return; + ctrl_outl(0, MAPLE_ENABLE); + liststatus = 0; + bus_for_each_dev(&maple_bus_type, NULL, NULL, + setup_maple_commands); + if (time_after(jiffies, maple_pnp_time)) + maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL; + if (liststatus && list_empty(&maple_sentq)) { + INIT_LIST_HEAD(&maple_sentq); + maple_send(); + } + maplebus_dma_reset(); +} + +/* handle devices added via hotplugs - placing them on queue for DEVINFO*/ +static void maple_map_subunits(struct maple_device *mdev, int submask) +{ + int retval, k, devcheck; + struct maple_device *mdev_add; + struct maple_device_specify ds; + + for (k = 0; k < 5; k++) { + ds.port = mdev->port; + ds.unit = k + 1; + retval = + bus_for_each_dev(&maple_bus_type, NULL, &ds, + detach_maple_device); + if (retval) { + submask = submask >> 1; + continue; + } + devcheck = submask & 0x01; + if (devcheck) { + mdev_add = maple_alloc_dev(mdev->port, k + 1); + if (!mdev_add) + return; + mdev_add->mq->command = MAPLE_COMMAND_DEVINFO; + mdev_add->mq->length = 0; + maple_add_packet(mdev_add->mq); + scanning = 1; + } + submask = submask >> 1; + } +} + +/* mark a device as removed */ +static void maple_clean_submap(struct maple_device *mdev) +{ + int killbit; + + killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20); + killbit = ~killbit; + killbit &= 0xFF; + subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit; +} + +/* handle empty port or hotplug removal */ +static void maple_response_none(struct maple_device *mdev, + struct mapleq *mq) +{ + if (mdev->unit != 0) { + list_del(&mq->list); + maple_clean_submap(mdev); + printk(KERN_INFO + "Maple bus device detaching at (%d, %d)\n", + mdev->port, mdev->unit); + maple_detach_driver(mdev); + return; + } + if (!started) { + printk(KERN_INFO "No maple devices attached to port %d\n", + mdev->port); + return; + } + maple_clean_submap(mdev); +} + +/* preprocess hotplugs or scans */ +static void maple_response_devinfo(struct maple_device *mdev, + char *recvbuf) +{ + char submask; + if ((!started) || (scanning == 2)) { + maple_attach_driver(mdev); + return; + } + if (mdev->unit == 0) { + submask = recvbuf[2] & 0x1F; + if (submask ^ subdevice_map[mdev->port]) { + maple_map_subunits(mdev, submask); + subdevice_map[mdev->port] = submask; + } + } +} + +/* maple dma end bottom half - implemented via workqueue */ +static void maple_dma_handler(struct work_struct *work) +{ + struct mapleq *mq, *nmq; + struct maple_device *dev; + char *recvbuf; + enum maple_code code; + + if (!maple_dma_done()) + return; + ctrl_outl(0, MAPLE_ENABLE); + if (!list_empty(&maple_sentq)) { + list_for_each_entry_safe(mq, nmq, &maple_sentq, list) { + recvbuf = mq->recvbuf; + code = recvbuf[0]; + dev = mq->dev; + switch (code) { + case MAPLE_RESPONSE_NONE: + maple_response_none(dev, mq); + break; + + case MAPLE_RESPONSE_DEVINFO: + maple_response_devinfo(dev, recvbuf); + break; + + case MAPLE_RESPONSE_DATATRF: + if (dev->callback) + dev->callback(mq); + break; + + case MAPLE_RESPONSE_FILEERR: + case MAPLE_RESPONSE_AGAIN: + case MAPLE_RESPONSE_BADCMD: + case MAPLE_RESPONSE_BADFUNC: + printk(KERN_DEBUG + "Maple non-fatal error 0x%X\n", + code); + break; + + case MAPLE_RESPONSE_ALLINFO: + printk(KERN_DEBUG + "Maple - extended device information not supported\n"); + break; + + case MAPLE_RESPONSE_OK: + break; + + default: + break; + } + } + 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, char **envp, + int num_envp, char *buffer, int buffer_size) +{ + 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); |