diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/sh/maple/maple.c | 895 |
1 files changed, 895 insertions, 0 deletions
diff --git a/drivers/sh/maple/maple.c b/drivers/sh/maple/maple.c new file mode 100644 index 000000000..e24e220e5 --- /dev/null +++ b/drivers/sh/maple/maple.c @@ -0,0 +1,895 @@ +/* + * Core maple bus functionality + * + * Copyright (C) 2007 - 2009 Adrian McMenamin + * Copyright (C) 2001 - 2008 Paul Mundt + * Copyright (C) 2000 - 2001 YAEGASHI Takeshi + * Copyright (C) 2001 M. R. Brown + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/maple.h> +#include <linux/dma-mapping.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <asm/cacheflush.h> +#include <asm/dma.h> +#include <asm/io.h> +#include <mach/dma.h> +#include <mach/sysasic.h> + +MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); +MODULE_DESCRIPTION("Maple bus driver for Dreamcast"); +MODULE_LICENSE("GPL v2"); + +static void maple_dma_handler(struct work_struct *work); +static void maple_vblank_handler(struct work_struct *work); + +static DECLARE_WORK(maple_dma_process, maple_dma_handler); +static DECLARE_WORK(maple_vblank_process, maple_vblank_handler); + +static LIST_HEAD(maple_waitq); +static LIST_HEAD(maple_sentq); + +/* mutex to protect queue of waiting packets */ +static DEFINE_MUTEX(maple_wlist_lock); + +static struct maple_driver maple_unsupported_device; +static struct device maple_bus; +static int subdevice_map[MAPLE_PORTS]; +static unsigned long *maple_sendbuf, *maple_sendptr, *maple_lastptr; +static unsigned long maple_pnp_time; +static int started, scanning, fullscan; +static struct kmem_cache *maple_queue_cache; + +struct maple_device_specify { + int port; + int unit; +}; + +static bool checked[MAPLE_PORTS]; +static bool empty[MAPLE_PORTS]; +static struct maple_device *baseunits[MAPLE_PORTS]; + +/** + * maple_driver_register - register a maple driver + * @drv: maple driver to be registered. + * + * Registers the passed in @drv, while updating the bus type. + * Devices with matching function IDs will be automatically probed. + */ +int maple_driver_register(struct maple_driver *drv) +{ + if (!drv) + return -EINVAL; + + drv->drv.bus = &maple_bus_type; + + return driver_register(&drv->drv); +} +EXPORT_SYMBOL_GPL(maple_driver_register); + +/** + * maple_driver_unregister - unregister a maple driver. + * @drv: maple driver to unregister. + * + * Cleans up after maple_driver_register(). To be invoked in the exit + * path of any module drivers. + */ +void maple_driver_unregister(struct maple_driver *drv) +{ + driver_unregister(&drv->drv); +} +EXPORT_SYMBOL_GPL(maple_driver_unregister); + +/* set hardware registers to enable next round of dma */ +static void maple_dma_reset(void) +{ + __raw_writel(MAPLE_MAGIC, MAPLE_RESET); + /* set trig type to 0 for software trigger, 1 for hardware (VBLANK) */ + __raw_writel(1, MAPLE_TRIGTYPE); + /* + * Maple system register + * bits 31 - 16 timeout in units of 20nsec + * bit 12 hard trigger - set 0 to keep responding to VBLANK + * bits 9 - 8 set 00 for 2 Mbps, 01 for 1 Mbps + * bits 3 - 0 delay (in 1.3ms) between VBLANK and start of DMA + * max delay is 11 + */ + __raw_writel(MAPLE_2MBPS | MAPLE_TIMEOUT(0xFFFF), MAPLE_SPEED); + __raw_writel(virt_to_phys(maple_sendbuf), MAPLE_DMAADDR); + __raw_writel(1, MAPLE_ENABLE); +} + +/** + * maple_getcond_callback - setup handling MAPLE_COMMAND_GETCOND + * @dev: device responding + * @callback: handler callback + * @interval: interval in jiffies between callbacks + * @function: the function code for the device + */ +void maple_getcond_callback(struct maple_device *dev, + void (*callback) (struct mapleq *mq), + unsigned long interval, unsigned long function) +{ + dev->callback = callback; + dev->interval = interval; + dev->function = cpu_to_be32(function); + dev->when = jiffies; +} +EXPORT_SYMBOL_GPL(maple_getcond_callback); + +static int maple_dma_done(void) +{ + return (__raw_readl(MAPLE_STATE) & 1) == 0; +} + +static void maple_release_device(struct device *dev) +{ + struct maple_device *mdev; + struct mapleq *mq; + + mdev = to_maple_dev(dev); + mq = mdev->mq; + kmem_cache_free(maple_queue_cache, mq->recvbuf); + kfree(mq); + kfree(mdev); +} + +/** + * maple_add_packet - add a single instruction to the maple bus queue + * @mdev: maple device + * @function: function on device being queried + * @command: maple command to add + * @length: length of command string (in 32 bit words) + * @data: remainder of command string + */ +int maple_add_packet(struct maple_device *mdev, u32 function, u32 command, + size_t length, void *data) +{ + int ret = 0; + void *sendbuf = NULL; + + if (length) { + sendbuf = kcalloc(length, 4, GFP_KERNEL); + if (!sendbuf) { + ret = -ENOMEM; + goto out; + } + ((__be32 *)sendbuf)[0] = cpu_to_be32(function); + } + + mdev->mq->command = command; + mdev->mq->length = length; + if (length > 1) + memcpy(sendbuf + 4, data, (length - 1) * 4); + mdev->mq->sendbuf = sendbuf; + + mutex_lock(&maple_wlist_lock); + list_add_tail(&mdev->mq->list, &maple_waitq); + mutex_unlock(&maple_wlist_lock); +out: + return ret; +} +EXPORT_SYMBOL_GPL(maple_add_packet); + +static struct mapleq *maple_allocq(struct maple_device *mdev) +{ + struct mapleq *mq; + + mq = kzalloc(sizeof(*mq), GFP_KERNEL); + if (!mq) + goto failed_nomem; + + INIT_LIST_HEAD(&mq->list); + mq->dev = mdev; + mq->recvbuf = kmem_cache_zalloc(maple_queue_cache, GFP_KERNEL); + if (!mq->recvbuf) + goto failed_p2; + mq->recvbuf->buf = &((mq->recvbuf->bufx)[0]); + + return mq; + +failed_p2: + kfree(mq); +failed_nomem: + dev_err(&mdev->dev, "could not allocate memory for device (%d, %d)\n", + mdev->port, mdev->unit); + return NULL; +} + +static struct maple_device *maple_alloc_dev(int port, int unit) +{ + struct maple_device *mdev; + + /* zero this out to avoid kobj subsystem + * thinking it has already been registered */ + + mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); + if (!mdev) + return NULL; + + mdev->port = port; + mdev->unit = unit; + + mdev->mq = maple_allocq(mdev); + + if (!mdev->mq) { + kfree(mdev); + return NULL; + } + mdev->dev.bus = &maple_bus_type; + mdev->dev.parent = &maple_bus; + init_waitqueue_head(&mdev->maple_wait); + return mdev; +} + +static void maple_free_dev(struct maple_device *mdev) +{ + kmem_cache_free(maple_queue_cache, mdev->mq->recvbuf); + kfree(mdev->mq); + kfree(mdev); +} + +/* process the command queue into a maple command block + * terminating command has bit 32 of first long set to 0 + */ +static void maple_build_block(struct mapleq *mq) +{ + int port, unit, from, to, len; + unsigned long *lsendbuf = mq->sendbuf; + + port = mq->dev->port & 3; + unit = mq->dev->unit; + len = mq->length; + from = port << 6; + to = (port << 6) | (unit > 0 ? (1 << (unit - 1)) & 0x1f : 0x20); + + *maple_lastptr &= 0x7fffffff; + maple_lastptr = maple_sendptr; + + *maple_sendptr++ = (port << 16) | len | 0x80000000; + *maple_sendptr++ = virt_to_phys(mq->recvbuf->buf); + *maple_sendptr++ = + mq->command | (to << 8) | (from << 16) | (len << 24); + while (len-- > 0) + *maple_sendptr++ = *lsendbuf++; +} + +/* build up command queue */ +static void maple_send(void) +{ + int i, maple_packets = 0; + struct mapleq *mq, *nmq; + + if (!maple_dma_done()) + return; + + /* disable DMA */ + __raw_writel(0, MAPLE_ENABLE); + + if (!list_empty(&maple_sentq)) + goto finish; + + mutex_lock(&maple_wlist_lock); + if (list_empty(&maple_waitq)) { + mutex_unlock(&maple_wlist_lock); + goto finish; + } + + maple_lastptr = maple_sendbuf; + maple_sendptr = maple_sendbuf; + + list_for_each_entry_safe(mq, nmq, &maple_waitq, list) { + maple_build_block(mq); + list_del_init(&mq->list); + list_add_tail(&mq->list, &maple_sentq); + if (maple_packets++ > MAPLE_MAXPACKETS) + break; + } + mutex_unlock(&maple_wlist_lock); + if (maple_packets > 0) { + for (i = 0; i < (1 << MAPLE_DMA_PAGES); i++) + __flush_purge_region(maple_sendbuf + i * PAGE_SIZE, + PAGE_SIZE); + } + +finish: + maple_dma_reset(); +} + +/* check if there is a driver registered likely to match this device */ +static int maple_check_matching_driver(struct device_driver *driver, + void *devptr) +{ + struct maple_driver *maple_drv; + struct maple_device *mdev; + + mdev = devptr; + maple_drv = to_maple_driver(driver); + if (mdev->devinfo.function & cpu_to_be32(maple_drv->function)) + return 1; + return 0; +} + +static void maple_detach_driver(struct maple_device *mdev) +{ + device_unregister(&mdev->dev); +} + +/* process initial MAPLE_COMMAND_DEVINFO for each device or port */ +static void maple_attach_driver(struct maple_device *mdev) +{ + char *p, *recvbuf; + unsigned long function; + int matched, error; + + recvbuf = mdev->mq->recvbuf->buf; + /* copy the data as individual elements in + * case of memory optimisation */ + memcpy(&mdev->devinfo.function, recvbuf + 4, 4); + memcpy(&mdev->devinfo.function_data[0], recvbuf + 8, 12); + memcpy(&mdev->devinfo.area_code, recvbuf + 20, 1); + memcpy(&mdev->devinfo.connector_direction, recvbuf + 21, 1); + memcpy(&mdev->devinfo.product_name[0], recvbuf + 22, 30); + memcpy(&mdev->devinfo.standby_power, recvbuf + 112, 2); + memcpy(&mdev->devinfo.max_power, recvbuf + 114, 2); + memcpy(mdev->product_name, mdev->devinfo.product_name, 30); + mdev->product_name[30] = '\0'; + memcpy(mdev->product_licence, mdev->devinfo.product_licence, 60); + mdev->product_licence[60] = '\0'; + + for (p = mdev->product_name + 29; mdev->product_name <= p; p--) + if (*p == ' ') + *p = '\0'; + else + break; + for (p = mdev->product_licence + 59; mdev->product_licence <= p; p--) + if (*p == ' ') + *p = '\0'; + else + break; + + function = be32_to_cpu(mdev->devinfo.function); + + dev_info(&mdev->dev, "detected %s: function 0x%lX: at (%d, %d)\n", + mdev->product_name, function, mdev->port, mdev->unit); + + if (function > 0x200) { + /* Do this silently - as not a real device */ + function = 0; + mdev->driver = &maple_unsupported_device; + dev_set_name(&mdev->dev, "%d:0.port", mdev->port); + } else { + matched = + bus_for_each_drv(&maple_bus_type, NULL, mdev, + maple_check_matching_driver); + + if (matched == 0) { + /* Driver does not exist yet */ + dev_info(&mdev->dev, "no driver found\n"); + mdev->driver = &maple_unsupported_device; + } + dev_set_name(&mdev->dev, "%d:0%d.%lX", mdev->port, + mdev->unit, function); + } + + mdev->function = function; + mdev->dev.release = &maple_release_device; + + atomic_set(&mdev->busy, 0); + error = device_register(&mdev->dev); + if (error) { + dev_warn(&mdev->dev, "could not register device at" + " (%d, %d), with error 0x%X\n", mdev->unit, + mdev->port, error); + maple_free_dev(mdev); + mdev = NULL; + return; + } +} + +/* + * if device has been registered for the given + * port and unit then return 1 - allows identification + * of which devices need to be attached or detached + */ +static int check_maple_device(struct device *device, void *portptr) +{ + struct maple_device_specify *ds; + struct maple_device *mdev; + + ds = portptr; + mdev = to_maple_dev(device); + if (mdev->port == ds->port && mdev->unit == ds->unit) + return 1; + return 0; +} + +static int setup_maple_commands(struct device *device, void *ignored) +{ + int add; + struct maple_device *mdev = to_maple_dev(device); + if (mdev->interval > 0 && atomic_read(&mdev->busy) == 0 && + time_after(jiffies, mdev->when)) { + /* bounce if we cannot add */ + add = maple_add_packet(mdev, + be32_to_cpu(mdev->devinfo.function), + MAPLE_COMMAND_GETCOND, 1, NULL); + if (!add) + mdev->when = jiffies + mdev->interval; + } else { + if (time_after(jiffies, maple_pnp_time)) + /* Ensure we don't have block reads and devinfo + * calls interfering with one another - so flag the + * device as busy */ + if (atomic_read(&mdev->busy) == 0) { + atomic_set(&mdev->busy, 1); + maple_add_packet(mdev, 0, + MAPLE_COMMAND_DEVINFO, 0, NULL); + } + } + return 0; +} + +/* VBLANK bottom half - implemented via workqueue */ +static void maple_vblank_handler(struct work_struct *work) +{ + int x, locking; + struct maple_device *mdev; + + if (!maple_dma_done()) + return; + + __raw_writel(0, MAPLE_ENABLE); + + if (!list_empty(&maple_sentq)) + goto finish; + + /* + * Set up essential commands - to fetch data and + * check devices are still present + */ + bus_for_each_dev(&maple_bus_type, NULL, NULL, + setup_maple_commands); + + if (time_after(jiffies, maple_pnp_time)) { + /* + * Scan the empty ports - bus is flakey and may have + * mis-reported emptyness + */ + for (x = 0; x < MAPLE_PORTS; x++) { + if (checked[x] && empty[x]) { + mdev = baseunits[x]; + if (!mdev) + break; + atomic_set(&mdev->busy, 1); + locking = maple_add_packet(mdev, 0, + MAPLE_COMMAND_DEVINFO, 0, NULL); + if (!locking) + break; + } + } + + maple_pnp_time = jiffies + MAPLE_PNP_INTERVAL; + } + +finish: + maple_send(); +} + +/* handle devices added via hotplugs - placing them on queue for DEVINFO */ +static void maple_map_subunits(struct maple_device *mdev, int submask) +{ + int retval, k, devcheck; + struct maple_device *mdev_add; + struct maple_device_specify ds; + + ds.port = mdev->port; + for (k = 0; k < 5; k++) { + ds.unit = k + 1; + retval = + bus_for_each_dev(&maple_bus_type, NULL, &ds, + check_maple_device); + if (retval) { + submask = submask >> 1; + continue; + } + devcheck = submask & 0x01; + if (devcheck) { + mdev_add = maple_alloc_dev(mdev->port, k + 1); + if (!mdev_add) + return; + atomic_set(&mdev_add->busy, 1); + maple_add_packet(mdev_add, 0, MAPLE_COMMAND_DEVINFO, + 0, NULL); + /* mark that we are checking sub devices */ + scanning = 1; + } + submask = submask >> 1; + } +} + +/* mark a device as removed */ +static void maple_clean_submap(struct maple_device *mdev) +{ + int killbit; + + killbit = (mdev->unit > 0 ? (1 << (mdev->unit - 1)) & 0x1f : 0x20); + killbit = ~killbit; + killbit &= 0xFF; + subdevice_map[mdev->port] = subdevice_map[mdev->port] & killbit; +} + +/* handle empty port or hotplug removal */ +static void maple_response_none(struct maple_device *mdev) +{ + maple_clean_submap(mdev); + + if (likely(mdev->unit != 0)) { + /* + * Block devices play up + * and give the impression they have + * been removed even when still in place or + * trip the mtd layer when they have + * really gone - this code traps that eventuality + * and ensures we aren't overloaded with useless + * error messages + */ + if (mdev->can_unload) { + if (!mdev->can_unload(mdev)) { + atomic_set(&mdev->busy, 2); + wake_up(&mdev->maple_wait); + return; + } + } + + dev_info(&mdev->dev, "detaching device at (%d, %d)\n", + mdev->port, mdev->unit); + maple_detach_driver(mdev); + return; + } else { + if (!started || !fullscan) { + if (checked[mdev->port] == false) { + checked[mdev->port] = true; + empty[mdev->port] = true; + dev_info(&mdev->dev, "no devices" + " to port %d\n", mdev->port); + } + return; + } + } + /* Some hardware devices generate false detach messages on unit 0 */ + atomic_set(&mdev->busy, 0); +} + +/* preprocess hotplugs or scans */ +static void maple_response_devinfo(struct maple_device *mdev, + char *recvbuf) +{ + char submask; + if (!started || (scanning == 2) || !fullscan) { + if ((mdev->unit == 0) && (checked[mdev->port] == false)) { + checked[mdev->port] = true; + maple_attach_driver(mdev); + } else { + if (mdev->unit != 0) + maple_attach_driver(mdev); + if (mdev->unit == 0) { + empty[mdev->port] = false; + maple_attach_driver(mdev); + } + } + } + if (mdev->unit == 0) { + submask = recvbuf[2] & 0x1F; + if (submask ^ subdevice_map[mdev->port]) { + maple_map_subunits(mdev, submask); + subdevice_map[mdev->port] = submask; + } + } +} + +static void maple_response_fileerr(struct maple_device *mdev, void *recvbuf) +{ + if (mdev->fileerr_handler) { + mdev->fileerr_handler(mdev, recvbuf); + return; + } else + dev_warn(&mdev->dev, "device at (%d, %d) reports" + "file error 0x%X\n", mdev->port, mdev->unit, + ((int *)recvbuf)[1]); +} + +static void maple_port_rescan(void) +{ + int i; + struct maple_device *mdev; + + fullscan = 1; + for (i = 0; i < MAPLE_PORTS; i++) { + if (checked[i] == false) { + fullscan = 0; + mdev = baseunits[i]; + maple_add_packet(mdev, 0, MAPLE_COMMAND_DEVINFO, + 0, NULL); + } + } +} + +/* maple dma end bottom half - implemented via workqueue */ +static void maple_dma_handler(struct work_struct *work) +{ + struct mapleq *mq, *nmq; + struct maple_device *mdev; + char *recvbuf; + enum maple_code code; + + if (!maple_dma_done()) + return; + __raw_writel(0, MAPLE_ENABLE); + if (!list_empty(&maple_sentq)) { + list_for_each_entry_safe(mq, nmq, &maple_sentq, list) { + mdev = mq->dev; + recvbuf = mq->recvbuf->buf; + __flush_invalidate_region(sh_cacheop_vaddr(recvbuf), + 0x400); + code = recvbuf[0]; + kfree(mq->sendbuf); + list_del_init(&mq->list); + switch (code) { + case MAPLE_RESPONSE_NONE: + maple_response_none(mdev); + break; + + case MAPLE_RESPONSE_DEVINFO: + maple_response_devinfo(mdev, recvbuf); + atomic_set(&mdev->busy, 0); + break; + + case MAPLE_RESPONSE_DATATRF: + if (mdev->callback) + mdev->callback(mq); + atomic_set(&mdev->busy, 0); + wake_up(&mdev->maple_wait); + break; + + case MAPLE_RESPONSE_FILEERR: + maple_response_fileerr(mdev, recvbuf); + atomic_set(&mdev->busy, 0); + wake_up(&mdev->maple_wait); + break; + + case MAPLE_RESPONSE_AGAIN: + case MAPLE_RESPONSE_BADCMD: + case MAPLE_RESPONSE_BADFUNC: + dev_warn(&mdev->dev, "non-fatal error" + " 0x%X at (%d, %d)\n", code, + mdev->port, mdev->unit); + atomic_set(&mdev->busy, 0); + break; + + case MAPLE_RESPONSE_ALLINFO: + dev_notice(&mdev->dev, "extended" + " device information request for (%d, %d)" + " but call is not supported\n", mdev->port, + mdev->unit); + atomic_set(&mdev->busy, 0); + break; + + case MAPLE_RESPONSE_OK: + atomic_set(&mdev->busy, 0); + wake_up(&mdev->maple_wait); + break; + + default: + break; + } + } + /* if scanning is 1 then we have subdevices to check */ + if (scanning == 1) { + maple_send(); + scanning = 2; + } else + scanning = 0; + /*check if we have actually tested all ports yet */ + if (!fullscan) + maple_port_rescan(); + /* mark that we have been through the first scan */ + started = 1; + } + maple_send(); +} + +static irqreturn_t maple_dma_interrupt(int irq, void *dev_id) +{ + /* Load everything into the bottom half */ + schedule_work(&maple_dma_process); + return IRQ_HANDLED; +} + +static irqreturn_t maple_vblank_interrupt(int irq, void *dev_id) +{ + schedule_work(&maple_vblank_process); + return IRQ_HANDLED; +} + +static int maple_set_dma_interrupt_handler(void) +{ + return request_irq(HW_EVENT_MAPLE_DMA, maple_dma_interrupt, + IRQF_SHARED, "maple bus DMA", &maple_unsupported_device); +} + +static int maple_set_vblank_interrupt_handler(void) +{ + return request_irq(HW_EVENT_VSYNC, maple_vblank_interrupt, + IRQF_SHARED, "maple bus VBLANK", &maple_unsupported_device); +} + +static int maple_get_dma_buffer(void) +{ + maple_sendbuf = + (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, + MAPLE_DMA_PAGES); + if (!maple_sendbuf) + return -ENOMEM; + return 0; +} + +static int maple_match_bus_driver(struct device *devptr, + struct device_driver *drvptr) +{ + struct maple_driver *maple_drv = to_maple_driver(drvptr); + struct maple_device *maple_dev = to_maple_dev(devptr); + + /* Trap empty port case */ + if (maple_dev->devinfo.function == 0xFFFFFFFF) + return 0; + else if (maple_dev->devinfo.function & + cpu_to_be32(maple_drv->function)) + return 1; + return 0; +} + +static int maple_bus_uevent(struct device *dev, + struct kobj_uevent_env *env) +{ + return 0; +} + +static void maple_bus_release(struct device *dev) +{ +} + +static struct maple_driver maple_unsupported_device = { + .drv = { + .name = "maple_unsupported_device", + .bus = &maple_bus_type, + }, +}; +/* + * maple_bus_type - core maple bus structure + */ +struct bus_type maple_bus_type = { + .name = "maple", + .match = maple_match_bus_driver, + .uevent = maple_bus_uevent, +}; +EXPORT_SYMBOL_GPL(maple_bus_type); + +static struct device maple_bus = { + .init_name = "maple", + .release = maple_bus_release, +}; + +static int __init maple_bus_init(void) +{ + int retval, i; + struct maple_device *mdev[MAPLE_PORTS]; + + __raw_writel(0, MAPLE_ENABLE); + + retval = device_register(&maple_bus); + if (retval) + goto cleanup; + + retval = bus_register(&maple_bus_type); + if (retval) + goto cleanup_device; + + retval = driver_register(&maple_unsupported_device.drv); + if (retval) + goto cleanup_bus; + + /* allocate memory for maple bus dma */ + retval = maple_get_dma_buffer(); + if (retval) { + dev_err(&maple_bus, "failed to allocate DMA buffers\n"); + goto cleanup_basic; + } + + /* set up DMA interrupt handler */ + retval = maple_set_dma_interrupt_handler(); + if (retval) { + dev_err(&maple_bus, "bus failed to grab maple " + "DMA IRQ\n"); + goto cleanup_dma; + } + + /* set up VBLANK interrupt handler */ + retval = maple_set_vblank_interrupt_handler(); + if (retval) { + dev_err(&maple_bus, "bus failed to grab VBLANK IRQ\n"); + goto cleanup_irq; + } + + maple_queue_cache = KMEM_CACHE(maple_buffer, SLAB_HWCACHE_ALIGN); + + if (!maple_queue_cache) { + retval = -ENOMEM; + goto cleanup_bothirqs; + } + + INIT_LIST_HEAD(&maple_waitq); + INIT_LIST_HEAD(&maple_sentq); + + /* setup maple ports */ + for (i = 0; i < MAPLE_PORTS; i++) { + checked[i] = false; + empty[i] = false; + mdev[i] = maple_alloc_dev(i, 0); + if (!mdev[i]) { + while (i-- > 0) + maple_free_dev(mdev[i]); + retval = -ENOMEM; + goto cleanup_cache; + } + baseunits[i] = mdev[i]; + atomic_set(&mdev[i]->busy, 1); + maple_add_packet(mdev[i], 0, MAPLE_COMMAND_DEVINFO, 0, NULL); + subdevice_map[i] = 0; + } + + maple_pnp_time = jiffies + HZ; + /* prepare initial queue */ + maple_send(); + dev_info(&maple_bus, "bus core now registered\n"); + + return 0; + +cleanup_cache: + kmem_cache_destroy(maple_queue_cache); + +cleanup_bothirqs: + free_irq(HW_EVENT_VSYNC, 0); + +cleanup_irq: + free_irq(HW_EVENT_MAPLE_DMA, 0); + +cleanup_dma: + free_pages((unsigned long) maple_sendbuf, MAPLE_DMA_PAGES); + +cleanup_basic: + driver_unregister(&maple_unsupported_device.drv); + +cleanup_bus: + bus_unregister(&maple_bus_type); + +cleanup_device: + device_unregister(&maple_bus); + +cleanup: + printk(KERN_ERR "Maple bus registration failed\n"); + return retval; +} +/* Push init to later to ensure hardware gets detected */ +fs_initcall(maple_bus_init); |