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-rw-r--r--arch/arm/mach-bcmring/dma.c1518
1 files changed, 0 insertions, 1518 deletions
diff --git a/arch/arm/mach-bcmring/dma.c b/arch/arm/mach-bcmring/dma.c
deleted file mode 100644
index e5fd241..0000000
--- a/arch/arm/mach-bcmring/dma.c
+++ /dev/null
@@ -1,1518 +0,0 @@
-/*****************************************************************************
-* Copyright 2004 - 2008 Broadcom Corporation. All rights reserved.
-*
-* Unless you and Broadcom execute a separate written software license
-* agreement governing use of this software, this software is licensed to you
-* under the terms of the GNU General Public License version 2, available at
-* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
-*
-* Notwithstanding the above, under no circumstances may you combine this
-* software in any way with any other Broadcom software provided under a
-* license other than the GPL, without Broadcom's express prior written
-* consent.
-*****************************************************************************/
-
-/****************************************************************************/
-/**
-* @file dma.c
-*
-* @brief Implements the DMA interface.
-*/
-/****************************************************************************/
-
-/* ---- Include Files ---------------------------------------------------- */
-
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/interrupt.h>
-#include <linux/sched.h>
-#include <linux/irqreturn.h>
-#include <linux/proc_fs.h>
-#include <linux/slab.h>
-
-#include <mach/timer.h>
-
-#include <linux/pfn.h>
-#include <linux/atomic.h>
-#include <mach/dma.h>
-
-/* ---- Public Variables ------------------------------------------------- */
-
-/* ---- Private Constants and Types -------------------------------------- */
-
-#define MAKE_HANDLE(controllerIdx, channelIdx) (((controllerIdx) << 4) | (channelIdx))
-
-#define CONTROLLER_FROM_HANDLE(handle) (((handle) >> 4) & 0x0f)
-#define CHANNEL_FROM_HANDLE(handle) ((handle) & 0x0f)
-
-
-/* ---- Private Variables ------------------------------------------------ */
-
-static DMA_Global_t gDMA;
-static struct proc_dir_entry *gDmaDir;
-
-#include "dma_device.c"
-
-/* ---- Private Function Prototypes -------------------------------------- */
-
-/* ---- Functions ------------------------------------------------------- */
-
-/****************************************************************************/
-/**
-* Displays information for /proc/dma/channels
-*/
-/****************************************************************************/
-
-static int dma_proc_read_channels(char *buf, char **start, off_t offset,
- int count, int *eof, void *data)
-{
- int controllerIdx;
- int channelIdx;
- int limit = count - 200;
- int len = 0;
- DMA_Channel_t *channel;
-
- if (down_interruptible(&gDMA.lock) < 0) {
- return -ERESTARTSYS;
- }
-
- for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS;
- controllerIdx++) {
- for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS;
- channelIdx++) {
- if (len >= limit) {
- break;
- }
-
- channel =
- &gDMA.controller[controllerIdx].channel[channelIdx];
-
- len +=
- sprintf(buf + len, "%d:%d ", controllerIdx,
- channelIdx);
-
- if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) !=
- 0) {
- len +=
- sprintf(buf + len, "Dedicated for %s ",
- DMA_gDeviceAttribute[channel->
- devType].name);
- } else {
- len += sprintf(buf + len, "Shared ");
- }
-
- if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) != 0) {
- len += sprintf(buf + len, "No ISR ");
- }
-
- if ((channel->flags & DMA_CHANNEL_FLAG_LARGE_FIFO) != 0) {
- len += sprintf(buf + len, "Fifo: 128 ");
- } else {
- len += sprintf(buf + len, "Fifo: 64 ");
- }
-
- if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) {
- len +=
- sprintf(buf + len, "InUse by %s",
- DMA_gDeviceAttribute[channel->
- devType].name);
-#if (DMA_DEBUG_TRACK_RESERVATION)
- len +=
- sprintf(buf + len, " (%s:%d)",
- channel->fileName,
- channel->lineNum);
-#endif
- } else {
- len += sprintf(buf + len, "Avail ");
- }
-
- if (channel->lastDevType != DMA_DEVICE_NONE) {
- len +=
- sprintf(buf + len, "Last use: %s ",
- DMA_gDeviceAttribute[channel->
- lastDevType].
- name);
- }
-
- len += sprintf(buf + len, "\n");
- }
- }
- up(&gDMA.lock);
- *eof = 1;
-
- return len;
-}
-
-/****************************************************************************/
-/**
-* Displays information for /proc/dma/devices
-*/
-/****************************************************************************/
-
-static int dma_proc_read_devices(char *buf, char **start, off_t offset,
- int count, int *eof, void *data)
-{
- int limit = count - 200;
- int len = 0;
- int devIdx;
-
- if (down_interruptible(&gDMA.lock) < 0) {
- return -ERESTARTSYS;
- }
-
- for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) {
- DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx];
-
- if (devAttr->name == NULL) {
- continue;
- }
-
- if (len >= limit) {
- break;
- }
-
- len += sprintf(buf + len, "%-12s ", devAttr->name);
-
- if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) {
- len +=
- sprintf(buf + len, "Dedicated %d:%d ",
- devAttr->dedicatedController,
- devAttr->dedicatedChannel);
- } else {
- len += sprintf(buf + len, "Shared DMA:");
- if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA0) != 0) {
- len += sprintf(buf + len, "0");
- }
- if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA1) != 0) {
- len += sprintf(buf + len, "1");
- }
- len += sprintf(buf + len, " ");
- }
- if ((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) {
- len += sprintf(buf + len, "NoISR ");
- }
- if ((devAttr->flags & DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) != 0) {
- len += sprintf(buf + len, "Allow-128 ");
- }
-
- len +=
- sprintf(buf + len,
- "Xfer #: %Lu Ticks: %Lu Bytes: %Lu DescLen: %u\n",
- devAttr->numTransfers, devAttr->transferTicks,
- devAttr->transferBytes,
- devAttr->ring.bytesAllocated);
-
- }
-
- up(&gDMA.lock);
- *eof = 1;
-
- return len;
-}
-
-/****************************************************************************/
-/**
-* Determines if a DMA_Device_t is "valid".
-*
-* @return
-* TRUE - dma device is valid
-* FALSE - dma device isn't valid
-*/
-/****************************************************************************/
-
-static inline int IsDeviceValid(DMA_Device_t device)
-{
- return (device >= 0) && (device < DMA_NUM_DEVICE_ENTRIES);
-}
-
-/****************************************************************************/
-/**
-* Translates a DMA handle into a pointer to a channel.
-*
-* @return
-* non-NULL - pointer to DMA_Channel_t
-* NULL - DMA Handle was invalid
-*/
-/****************************************************************************/
-
-static inline DMA_Channel_t *HandleToChannel(DMA_Handle_t handle)
-{
- int controllerIdx;
- int channelIdx;
-
- controllerIdx = CONTROLLER_FROM_HANDLE(handle);
- channelIdx = CHANNEL_FROM_HANDLE(handle);
-
- if ((controllerIdx > DMA_NUM_CONTROLLERS)
- || (channelIdx > DMA_NUM_CHANNELS)) {
- return NULL;
- }
- return &gDMA.controller[controllerIdx].channel[channelIdx];
-}
-
-/****************************************************************************/
-/**
-* Interrupt handler which is called to process DMA interrupts.
-*/
-/****************************************************************************/
-
-static irqreturn_t dma_interrupt_handler(int irq, void *dev_id)
-{
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
- int irqStatus;
-
- channel = (DMA_Channel_t *) dev_id;
-
- /* Figure out why we were called, and knock down the interrupt */
-
- irqStatus = dmacHw_getInterruptStatus(channel->dmacHwHandle);
- dmacHw_clearInterrupt(channel->dmacHwHandle);
-
- if ((channel->devType < 0)
- || (channel->devType > DMA_NUM_DEVICE_ENTRIES)) {
- printk(KERN_ERR "dma_interrupt_handler: Invalid devType: %d\n",
- channel->devType);
- return IRQ_NONE;
- }
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- /* Update stats */
-
- if ((irqStatus & dmacHw_INTERRUPT_STATUS_TRANS) != 0) {
- devAttr->transferTicks +=
- (timer_get_tick_count() - devAttr->transferStartTime);
- }
-
- if ((irqStatus & dmacHw_INTERRUPT_STATUS_ERROR) != 0) {
- printk(KERN_ERR
- "dma_interrupt_handler: devType :%d DMA error (%s)\n",
- channel->devType, devAttr->name);
- } else {
- devAttr->numTransfers++;
- devAttr->transferBytes += devAttr->numBytes;
- }
-
- /* Call any installed handler */
-
- if (devAttr->devHandler != NULL) {
- devAttr->devHandler(channel->devType, irqStatus,
- devAttr->userData);
- }
-
- return IRQ_HANDLED;
-}
-
-/****************************************************************************/
-/**
-* Allocates memory to hold a descriptor ring. The descriptor ring then
-* needs to be populated by making one or more calls to
-* dna_add_descriptors.
-*
-* The returned descriptor ring will be automatically initialized.
-*
-* @return
-* 0 Descriptor ring was allocated successfully
-* -EINVAL Invalid parameters passed in
-* -ENOMEM Unable to allocate memory for the desired number of descriptors.
-*/
-/****************************************************************************/
-
-int dma_alloc_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to populate */
- int numDescriptors /* Number of descriptors that need to be allocated. */
- ) {
- size_t bytesToAlloc = dmacHw_descriptorLen(numDescriptors);
-
- if ((ring == NULL) || (numDescriptors <= 0)) {
- return -EINVAL;
- }
-
- ring->physAddr = 0;
- ring->descriptorsAllocated = 0;
- ring->bytesAllocated = 0;
-
- ring->virtAddr = dma_alloc_writecombine(NULL,
- bytesToAlloc,
- &ring->physAddr,
- GFP_KERNEL);
- if (ring->virtAddr == NULL) {
- return -ENOMEM;
- }
-
- ring->bytesAllocated = bytesToAlloc;
- ring->descriptorsAllocated = numDescriptors;
-
- return dma_init_descriptor_ring(ring, numDescriptors);
-}
-
-EXPORT_SYMBOL(dma_alloc_descriptor_ring);
-
-/****************************************************************************/
-/**
-* Releases the memory which was previously allocated for a descriptor ring.
-*/
-/****************************************************************************/
-
-void dma_free_descriptor_ring(DMA_DescriptorRing_t *ring /* Descriptor to release */
- ) {
- if (ring->virtAddr != NULL) {
- dma_free_writecombine(NULL,
- ring->bytesAllocated,
- ring->virtAddr, ring->physAddr);
- }
-
- ring->bytesAllocated = 0;
- ring->descriptorsAllocated = 0;
- ring->virtAddr = NULL;
- ring->physAddr = 0;
-}
-
-EXPORT_SYMBOL(dma_free_descriptor_ring);
-
-/****************************************************************************/
-/**
-* Initializes a descriptor ring, so that descriptors can be added to it.
-* Once a descriptor ring has been allocated, it may be reinitialized for
-* use with additional/different regions of memory.
-*
-* Note that if 7 descriptors are allocated, it's perfectly acceptable to
-* initialize the ring with a smaller number of descriptors. The amount
-* of memory allocated for the descriptor ring will not be reduced, and
-* the descriptor ring may be reinitialized later
-*
-* @return
-* 0 Descriptor ring was initialized successfully
-* -ENOMEM The descriptor which was passed in has insufficient space
-* to hold the desired number of descriptors.
-*/
-/****************************************************************************/
-
-int dma_init_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to initialize */
- int numDescriptors /* Number of descriptors to initialize. */
- ) {
- if (ring->virtAddr == NULL) {
- return -EINVAL;
- }
- if (dmacHw_initDescriptor(ring->virtAddr,
- ring->physAddr,
- ring->bytesAllocated, numDescriptors) < 0) {
- printk(KERN_ERR
- "dma_init_descriptor_ring: dmacHw_initDescriptor failed\n");
- return -ENOMEM;
- }
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_init_descriptor_ring);
-
-/****************************************************************************/
-/**
-* Determines the number of descriptors which would be required for a
-* transfer of the indicated memory region.
-*
-* This function also needs to know which DMA device this transfer will
-* be destined for, so that the appropriate DMA configuration can be retrieved.
-* DMA parameters such as transfer width, and whether this is a memory-to-memory
-* or memory-to-peripheral, etc can all affect the actual number of descriptors
-* required.
-*
-* @return
-* > 0 Returns the number of descriptors required for the indicated transfer
-* -ENODEV - Device handed in is invalid.
-* -EINVAL Invalid parameters
-* -ENOMEM Memory exhausted
-*/
-/****************************************************************************/
-
-int dma_calculate_descriptor_count(DMA_Device_t device, /* DMA Device that this will be associated with */
- dma_addr_t srcData, /* Place to get data to write to device */
- dma_addr_t dstData, /* Pointer to device data address */
- size_t numBytes /* Number of bytes to transfer to the device */
- ) {
- int numDescriptors;
- DMA_DeviceAttribute_t *devAttr;
-
- if (!IsDeviceValid(device)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[device];
-
- numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config,
- (void *)srcData,
- (void *)dstData,
- numBytes);
- if (numDescriptors < 0) {
- printk(KERN_ERR
- "dma_calculate_descriptor_count: dmacHw_calculateDescriptorCount failed\n");
- return -EINVAL;
- }
-
- return numDescriptors;
-}
-
-EXPORT_SYMBOL(dma_calculate_descriptor_count);
-
-/****************************************************************************/
-/**
-* Adds a region of memory to the descriptor ring. Note that it may take
-* multiple descriptors for each region of memory. It is the callers
-* responsibility to allocate a sufficiently large descriptor ring.
-*
-* @return
-* 0 Descriptors were added successfully
-* -ENODEV Device handed in is invalid.
-* -EINVAL Invalid parameters
-* -ENOMEM Memory exhausted
-*/
-/****************************************************************************/
-
-int dma_add_descriptors(DMA_DescriptorRing_t *ring, /* Descriptor ring to add descriptors to */
- DMA_Device_t device, /* DMA Device that descriptors are for */
- dma_addr_t srcData, /* Place to get data (memory or device) */
- dma_addr_t dstData, /* Place to put data (memory or device) */
- size_t numBytes /* Number of bytes to transfer to the device */
- ) {
- int rc;
- DMA_DeviceAttribute_t *devAttr;
-
- if (!IsDeviceValid(device)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[device];
-
- rc = dmacHw_setDataDescriptor(&devAttr->config,
- ring->virtAddr,
- (void *)srcData,
- (void *)dstData, numBytes);
- if (rc < 0) {
- printk(KERN_ERR
- "dma_add_descriptors: dmacHw_setDataDescriptor failed with code: %d\n",
- rc);
- return -ENOMEM;
- }
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_add_descriptors);
-
-/****************************************************************************/
-/**
-* Sets the descriptor ring associated with a device.
-*
-* Once set, the descriptor ring will be associated with the device, even
-* across channel request/free calls. Passing in a NULL descriptor ring
-* will release any descriptor ring currently associated with the device.
-*
-* Note: If you call dma_transfer, or one of the other dma_alloc_ functions
-* the descriptor ring may be released and reallocated.
-*
-* Note: This function will release the descriptor memory for any current
-* descriptor ring associated with this device.
-*
-* @return
-* 0 Descriptors were added successfully
-* -ENODEV Device handed in is invalid.
-*/
-/****************************************************************************/
-
-int dma_set_device_descriptor_ring(DMA_Device_t device, /* Device to update the descriptor ring for. */
- DMA_DescriptorRing_t *ring /* Descriptor ring to add descriptors to */
- ) {
- DMA_DeviceAttribute_t *devAttr;
-
- if (!IsDeviceValid(device)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[device];
-
- /* Free the previously allocated descriptor ring */
-
- dma_free_descriptor_ring(&devAttr->ring);
-
- if (ring != NULL) {
- /* Copy in the new one */
-
- devAttr->ring = *ring;
- }
-
- /* Set things up so that if dma_transfer is called then this descriptor */
- /* ring will get freed. */
-
- devAttr->prevSrcData = 0;
- devAttr->prevDstData = 0;
- devAttr->prevNumBytes = 0;
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_set_device_descriptor_ring);
-
-/****************************************************************************/
-/**
-* Retrieves the descriptor ring associated with a device.
-*
-* @return
-* 0 Descriptors were added successfully
-* -ENODEV Device handed in is invalid.
-*/
-/****************************************************************************/
-
-int dma_get_device_descriptor_ring(DMA_Device_t device, /* Device to retrieve the descriptor ring for. */
- DMA_DescriptorRing_t *ring /* Place to store retrieved ring */
- ) {
- DMA_DeviceAttribute_t *devAttr;
-
- memset(ring, 0, sizeof(*ring));
-
- if (!IsDeviceValid(device)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[device];
-
- *ring = devAttr->ring;
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_get_device_descriptor_ring);
-
-/****************************************************************************/
-/**
-* Configures a DMA channel.
-*
-* @return
-* >= 0 - Initialization was successful.
-*
-* -EBUSY - Device is currently being used.
-* -ENODEV - Device handed in is invalid.
-*/
-/****************************************************************************/
-
-static int ConfigChannel(DMA_Handle_t handle)
-{
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
- int controllerIdx;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[channel->devType];
- controllerIdx = CONTROLLER_FROM_HANDLE(handle);
-
- if ((devAttr->flags & DMA_DEVICE_FLAG_PORT_PER_DMAC) != 0) {
- if (devAttr->config.transferType ==
- dmacHw_TRANSFER_TYPE_MEM_TO_PERIPHERAL) {
- devAttr->config.dstPeripheralPort =
- devAttr->dmacPort[controllerIdx];
- } else if (devAttr->config.transferType ==
- dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_MEM) {
- devAttr->config.srcPeripheralPort =
- devAttr->dmacPort[controllerIdx];
- }
- }
-
- if (dmacHw_configChannel(channel->dmacHwHandle, &devAttr->config) != 0) {
- printk(KERN_ERR "ConfigChannel: dmacHw_configChannel failed\n");
- return -EIO;
- }
-
- return 0;
-}
-
-/****************************************************************************/
-/**
-* Initializes all of the data structures associated with the DMA.
-* @return
-* >= 0 - Initialization was successful.
-*
-* -EBUSY - Device is currently being used.
-* -ENODEV - Device handed in is invalid.
-*/
-/****************************************************************************/
-
-int dma_init(void)
-{
- int rc = 0;
- int controllerIdx;
- int channelIdx;
- DMA_Device_t devIdx;
- DMA_Channel_t *channel;
- DMA_Handle_t dedicatedHandle;
-
- memset(&gDMA, 0, sizeof(gDMA));
-
- sema_init(&gDMA.lock, 0);
- init_waitqueue_head(&gDMA.freeChannelQ);
-
- /* Initialize the Hardware */
-
- dmacHw_initDma();
-
- /* Start off by marking all of the DMA channels as shared. */
-
- for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS;
- controllerIdx++) {
- for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS;
- channelIdx++) {
- channel =
- &gDMA.controller[controllerIdx].channel[channelIdx];
-
- channel->flags = 0;
- channel->devType = DMA_DEVICE_NONE;
- channel->lastDevType = DMA_DEVICE_NONE;
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
- channel->fileName = "";
- channel->lineNum = 0;
-#endif
-
- channel->dmacHwHandle =
- dmacHw_getChannelHandle(dmacHw_MAKE_CHANNEL_ID
- (controllerIdx,
- channelIdx));
- dmacHw_initChannel(channel->dmacHwHandle);
- }
- }
-
- /* Record any special attributes that channels may have */
-
- gDMA.controller[0].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO;
- gDMA.controller[0].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO;
- gDMA.controller[1].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO;
- gDMA.controller[1].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO;
-
- /* Now walk through and record the dedicated channels. */
-
- for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) {
- DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx];
-
- if (((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0)
- && ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0)) {
- printk(KERN_ERR
- "DMA Device: %s Can only request NO_ISR for dedicated devices\n",
- devAttr->name);
- rc = -EINVAL;
- goto out;
- }
-
- if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) {
- /* This is a dedicated device. Mark the channel as being reserved. */
-
- if (devAttr->dedicatedController >= DMA_NUM_CONTROLLERS) {
- printk(KERN_ERR
- "DMA Device: %s DMA Controller %d is out of range\n",
- devAttr->name,
- devAttr->dedicatedController);
- rc = -EINVAL;
- goto out;
- }
-
- if (devAttr->dedicatedChannel >= DMA_NUM_CHANNELS) {
- printk(KERN_ERR
- "DMA Device: %s DMA Channel %d is out of range\n",
- devAttr->name,
- devAttr->dedicatedChannel);
- rc = -EINVAL;
- goto out;
- }
-
- dedicatedHandle =
- MAKE_HANDLE(devAttr->dedicatedController,
- devAttr->dedicatedChannel);
- channel = HandleToChannel(dedicatedHandle);
-
- if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) !=
- 0) {
- printk
- ("DMA Device: %s attempting to use same DMA Controller:Channel (%d:%d) as %s\n",
- devAttr->name,
- devAttr->dedicatedController,
- devAttr->dedicatedChannel,
- DMA_gDeviceAttribute[channel->devType].
- name);
- rc = -EBUSY;
- goto out;
- }
-
- channel->flags |= DMA_CHANNEL_FLAG_IS_DEDICATED;
- channel->devType = devIdx;
-
- if (devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) {
- channel->flags |= DMA_CHANNEL_FLAG_NO_ISR;
- }
-
- /* For dedicated channels, we can go ahead and configure the DMA channel now */
- /* as well. */
-
- ConfigChannel(dedicatedHandle);
- }
- }
-
- /* Go through and register the interrupt handlers */
-
- for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS;
- controllerIdx++) {
- for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS;
- channelIdx++) {
- channel =
- &gDMA.controller[controllerIdx].channel[channelIdx];
-
- if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) == 0) {
- snprintf(channel->name, sizeof(channel->name),
- "dma %d:%d %s", controllerIdx,
- channelIdx,
- channel->devType ==
- DMA_DEVICE_NONE ? "" :
- DMA_gDeviceAttribute[channel->devType].
- name);
-
- rc =
- request_irq(IRQ_DMA0C0 +
- (controllerIdx *
- DMA_NUM_CHANNELS) +
- channelIdx,
- dma_interrupt_handler,
- IRQF_DISABLED, channel->name,
- channel);
- if (rc != 0) {
- printk(KERN_ERR
- "request_irq for IRQ_DMA%dC%d failed\n",
- controllerIdx, channelIdx);
- }
- }
- }
- }
-
- /* Create /proc/dma/channels and /proc/dma/devices */
-
- gDmaDir = proc_mkdir("dma", NULL);
-
- if (gDmaDir == NULL) {
- printk(KERN_ERR "Unable to create /proc/dma\n");
- } else {
- create_proc_read_entry("channels", 0, gDmaDir,
- dma_proc_read_channels, NULL);
- create_proc_read_entry("devices", 0, gDmaDir,
- dma_proc_read_devices, NULL);
- }
-
-out:
-
- up(&gDMA.lock);
-
- return rc;
-}
-
-/****************************************************************************/
-/**
-* Reserves a channel for use with @a dev. If the device is setup to use
-* a shared channel, then this function will block until a free channel
-* becomes available.
-*
-* @return
-* >= 0 - A valid DMA Handle.
-* -EBUSY - Device is currently being used.
-* -ENODEV - Device handed in is invalid.
-*/
-/****************************************************************************/
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
-DMA_Handle_t dma_request_channel_dbg
- (DMA_Device_t dev, const char *fileName, int lineNum)
-#else
-DMA_Handle_t dma_request_channel(DMA_Device_t dev)
-#endif
-{
- DMA_Handle_t handle;
- DMA_DeviceAttribute_t *devAttr;
- DMA_Channel_t *channel;
- int controllerIdx;
- int controllerIdx2;
- int channelIdx;
-
- if (down_interruptible(&gDMA.lock) < 0) {
- return -ERESTARTSYS;
- }
-
- if ((dev < 0) || (dev >= DMA_NUM_DEVICE_ENTRIES)) {
- handle = -ENODEV;
- goto out;
- }
- devAttr = &DMA_gDeviceAttribute[dev];
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
- {
- char *s;
-
- s = strrchr(fileName, '/');
- if (s != NULL) {
- fileName = s + 1;
- }
- }
-#endif
- if ((devAttr->flags & DMA_DEVICE_FLAG_IN_USE) != 0) {
- /* This device has already been requested and not been freed */
-
- printk(KERN_ERR "%s: device %s is already requested\n",
- __func__, devAttr->name);
- handle = -EBUSY;
- goto out;
- }
-
- if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) {
- /* This device has a dedicated channel. */
-
- channel =
- &gDMA.controller[devAttr->dedicatedController].
- channel[devAttr->dedicatedChannel];
- if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) {
- handle = -EBUSY;
- goto out;
- }
-
- channel->flags |= DMA_CHANNEL_FLAG_IN_USE;
- devAttr->flags |= DMA_DEVICE_FLAG_IN_USE;
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
- channel->fileName = fileName;
- channel->lineNum = lineNum;
-#endif
- handle =
- MAKE_HANDLE(devAttr->dedicatedController,
- devAttr->dedicatedChannel);
- goto out;
- }
-
- /* This device needs to use one of the shared channels. */
-
- handle = DMA_INVALID_HANDLE;
- while (handle == DMA_INVALID_HANDLE) {
- /* Scan through the shared channels and see if one is available */
-
- for (controllerIdx2 = 0; controllerIdx2 < DMA_NUM_CONTROLLERS;
- controllerIdx2++) {
- /* Check to see if we should try on controller 1 first. */
-
- controllerIdx = controllerIdx2;
- if ((devAttr->
- flags & DMA_DEVICE_FLAG_ALLOC_DMA1_FIRST) != 0) {
- controllerIdx = 1 - controllerIdx;
- }
-
- /* See if the device is available on the controller being tested */
-
- if ((devAttr->
- flags & (DMA_DEVICE_FLAG_ON_DMA0 << controllerIdx))
- != 0) {
- for (channelIdx = 0;
- channelIdx < DMA_NUM_CHANNELS;
- channelIdx++) {
- channel =
- &gDMA.controller[controllerIdx].
- channel[channelIdx];
-
- if (((channel->
- flags &
- DMA_CHANNEL_FLAG_IS_DEDICATED) ==
- 0)
- &&
- ((channel->
- flags & DMA_CHANNEL_FLAG_IN_USE)
- == 0)) {
- if (((channel->
- flags &
- DMA_CHANNEL_FLAG_LARGE_FIFO)
- != 0)
- &&
- ((devAttr->
- flags &
- DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO)
- == 0)) {
- /* This channel is a large fifo - don't tie it up */
- /* with devices that we don't want using it. */
-
- continue;
- }
-
- channel->flags |=
- DMA_CHANNEL_FLAG_IN_USE;
- channel->devType = dev;
- devAttr->flags |=
- DMA_DEVICE_FLAG_IN_USE;
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
- channel->fileName = fileName;
- channel->lineNum = lineNum;
-#endif
- handle =
- MAKE_HANDLE(controllerIdx,
- channelIdx);
-
- /* Now that we've reserved the channel - we can go ahead and configure it */
-
- if (ConfigChannel(handle) != 0) {
- handle = -EIO;
- printk(KERN_ERR
- "dma_request_channel: ConfigChannel failed\n");
- }
- goto out;
- }
- }
- }
- }
-
- /* No channels are currently available. Let's wait for one to free up. */
-
- {
- DEFINE_WAIT(wait);
-
- prepare_to_wait(&gDMA.freeChannelQ, &wait,
- TASK_INTERRUPTIBLE);
- up(&gDMA.lock);
- schedule();
- finish_wait(&gDMA.freeChannelQ, &wait);
-
- if (signal_pending(current)) {
- /* We don't currently hold gDMA.lock, so we return directly */
-
- return -ERESTARTSYS;
- }
- }
-
- if (down_interruptible(&gDMA.lock)) {
- return -ERESTARTSYS;
- }
- }
-
-out:
- up(&gDMA.lock);
-
- return handle;
-}
-
-/* Create both _dbg and non _dbg functions for modules. */
-
-#if (DMA_DEBUG_TRACK_RESERVATION)
-#undef dma_request_channel
-DMA_Handle_t dma_request_channel(DMA_Device_t dev)
-{
- return dma_request_channel_dbg(dev, __FILE__, __LINE__);
-}
-
-EXPORT_SYMBOL(dma_request_channel_dbg);
-#endif
-EXPORT_SYMBOL(dma_request_channel);
-
-/****************************************************************************/
-/**
-* Frees a previously allocated DMA Handle.
-*/
-/****************************************************************************/
-
-int dma_free_channel(DMA_Handle_t handle /* DMA handle. */
- ) {
- int rc = 0;
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
-
- if (down_interruptible(&gDMA.lock) < 0) {
- return -ERESTARTSYS;
- }
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- rc = -EINVAL;
- goto out;
- }
-
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) == 0) {
- channel->lastDevType = channel->devType;
- channel->devType = DMA_DEVICE_NONE;
- }
- channel->flags &= ~DMA_CHANNEL_FLAG_IN_USE;
- devAttr->flags &= ~DMA_DEVICE_FLAG_IN_USE;
-
-out:
- up(&gDMA.lock);
-
- wake_up_interruptible(&gDMA.freeChannelQ);
-
- return rc;
-}
-
-EXPORT_SYMBOL(dma_free_channel);
-
-/****************************************************************************/
-/**
-* Determines if a given device has been configured as using a shared
-* channel.
-*
-* @return
-* 0 Device uses a dedicated channel
-* > zero Device uses a shared channel
-* < zero Error code
-*/
-/****************************************************************************/
-
-int dma_device_is_channel_shared(DMA_Device_t device /* Device to check. */
- ) {
- DMA_DeviceAttribute_t *devAttr;
-
- if (!IsDeviceValid(device)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[device];
-
- return ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0);
-}
-
-EXPORT_SYMBOL(dma_device_is_channel_shared);
-
-/****************************************************************************/
-/**
-* Allocates buffers for the descriptors. This is normally done automatically
-* but needs to be done explicitly when initiating a dma from interrupt
-* context.
-*
-* @return
-* 0 Descriptors were allocated successfully
-* -EINVAL Invalid device type for this kind of transfer
-* (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM)
-* -ENOMEM Memory exhausted
-*/
-/****************************************************************************/
-
-int dma_alloc_descriptors(DMA_Handle_t handle, /* DMA Handle */
- dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */
- dma_addr_t srcData, /* Place to get data to write to device */
- dma_addr_t dstData, /* Pointer to device data address */
- size_t numBytes /* Number of bytes to transfer to the device */
- ) {
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
- int numDescriptors;
- size_t ringBytesRequired;
- int rc = 0;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
-
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- if (devAttr->config.transferType != transferType) {
- return -EINVAL;
- }
-
- /* Figure out how many descriptors we need. */
-
- /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */
- /* srcData, dstData, numBytes); */
-
- numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config,
- (void *)srcData,
- (void *)dstData,
- numBytes);
- if (numDescriptors < 0) {
- printk(KERN_ERR "%s: dmacHw_calculateDescriptorCount failed\n",
- __func__);
- return -EINVAL;
- }
-
- /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */
- /* a new one. */
-
- ringBytesRequired = dmacHw_descriptorLen(numDescriptors);
-
- /* printk("ringBytesRequired: %d\n", ringBytesRequired); */
-
- if (ringBytesRequired > devAttr->ring.bytesAllocated) {
- /* Make sure that this code path is never taken from interrupt context. */
- /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */
- /* allocation needs to have already been done. */
-
- might_sleep();
-
- /* Free the old descriptor ring and allocate a new one. */
-
- dma_free_descriptor_ring(&devAttr->ring);
-
- /* And allocate a new one. */
-
- rc =
- dma_alloc_descriptor_ring(&devAttr->ring,
- numDescriptors);
- if (rc < 0) {
- printk(KERN_ERR
- "%s: dma_alloc_descriptor_ring(%d) failed\n",
- __func__, numDescriptors);
- return rc;
- }
- /* Setup the descriptor for this transfer */
-
- if (dmacHw_initDescriptor(devAttr->ring.virtAddr,
- devAttr->ring.physAddr,
- devAttr->ring.bytesAllocated,
- numDescriptors) < 0) {
- printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n",
- __func__);
- return -EINVAL;
- }
- } else {
- /* We've already got enough ring buffer allocated. All we need to do is reset */
- /* any control information, just in case the previous DMA was stopped. */
-
- dmacHw_resetDescriptorControl(devAttr->ring.virtAddr);
- }
-
- /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */
- /* as last time, then we don't need to call setDataDescriptor again. */
-
- if (dmacHw_setDataDescriptor(&devAttr->config,
- devAttr->ring.virtAddr,
- (void *)srcData,
- (void *)dstData, numBytes) < 0) {
- printk(KERN_ERR "%s: dmacHw_setDataDescriptor failed\n",
- __func__);
- return -EINVAL;
- }
-
- /* Remember the critical information for this transfer so that we can eliminate */
- /* another call to dma_alloc_descriptors if the caller reuses the same buffers */
-
- devAttr->prevSrcData = srcData;
- devAttr->prevDstData = dstData;
- devAttr->prevNumBytes = numBytes;
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_alloc_descriptors);
-
-/****************************************************************************/
-/**
-* Allocates and sets up descriptors for a double buffered circular buffer.
-*
-* This is primarily intended to be used for things like the ingress samples
-* from a microphone.
-*
-* @return
-* > 0 Number of descriptors actually allocated.
-* -EINVAL Invalid device type for this kind of transfer
-* (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM)
-* -ENOMEM Memory exhausted
-*/
-/****************************************************************************/
-
-int dma_alloc_double_dst_descriptors(DMA_Handle_t handle, /* DMA Handle */
- dma_addr_t srcData, /* Physical address of source data */
- dma_addr_t dstData1, /* Physical address of first destination buffer */
- dma_addr_t dstData2, /* Physical address of second destination buffer */
- size_t numBytes /* Number of bytes in each destination buffer */
- ) {
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
- int numDst1Descriptors;
- int numDst2Descriptors;
- int numDescriptors;
- size_t ringBytesRequired;
- int rc = 0;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
-
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- /* Figure out how many descriptors we need. */
-
- /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */
- /* srcData, dstData, numBytes); */
-
- numDst1Descriptors =
- dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData,
- (void *)dstData1, numBytes);
- if (numDst1Descriptors < 0) {
- return -EINVAL;
- }
- numDst2Descriptors =
- dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData,
- (void *)dstData2, numBytes);
- if (numDst2Descriptors < 0) {
- return -EINVAL;
- }
- numDescriptors = numDst1Descriptors + numDst2Descriptors;
- /* printk("numDescriptors: %d\n", numDescriptors); */
-
- /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */
- /* a new one. */
-
- ringBytesRequired = dmacHw_descriptorLen(numDescriptors);
-
- /* printk("ringBytesRequired: %d\n", ringBytesRequired); */
-
- if (ringBytesRequired > devAttr->ring.bytesAllocated) {
- /* Make sure that this code path is never taken from interrupt context. */
- /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */
- /* allocation needs to have already been done. */
-
- might_sleep();
-
- /* Free the old descriptor ring and allocate a new one. */
-
- dma_free_descriptor_ring(&devAttr->ring);
-
- /* And allocate a new one. */
-
- rc =
- dma_alloc_descriptor_ring(&devAttr->ring,
- numDescriptors);
- if (rc < 0) {
- printk(KERN_ERR
- "%s: dma_alloc_descriptor_ring(%d) failed\n",
- __func__, ringBytesRequired);
- return rc;
- }
- }
-
- /* Setup the descriptor for this transfer. Since this function is used with */
- /* CONTINUOUS DMA operations, we need to reinitialize every time, otherwise */
- /* setDataDescriptor will keep trying to append onto the end. */
-
- if (dmacHw_initDescriptor(devAttr->ring.virtAddr,
- devAttr->ring.physAddr,
- devAttr->ring.bytesAllocated,
- numDescriptors) < 0) {
- printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", __func__);
- return -EINVAL;
- }
-
- /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */
- /* as last time, then we don't need to call setDataDescriptor again. */
-
- if (dmacHw_setDataDescriptor(&devAttr->config,
- devAttr->ring.virtAddr,
- (void *)srcData,
- (void *)dstData1, numBytes) < 0) {
- printk(KERN_ERR "%s: dmacHw_setDataDescriptor 1 failed\n",
- __func__);
- return -EINVAL;
- }
- if (dmacHw_setDataDescriptor(&devAttr->config,
- devAttr->ring.virtAddr,
- (void *)srcData,
- (void *)dstData2, numBytes) < 0) {
- printk(KERN_ERR "%s: dmacHw_setDataDescriptor 2 failed\n",
- __func__);
- return -EINVAL;
- }
-
- /* You should use dma_start_transfer rather than dma_transfer_xxx so we don't */
- /* try to make the 'prev' variables right. */
-
- devAttr->prevSrcData = 0;
- devAttr->prevDstData = 0;
- devAttr->prevNumBytes = 0;
-
- return numDescriptors;
-}
-
-EXPORT_SYMBOL(dma_alloc_double_dst_descriptors);
-
-/****************************************************************************/
-/**
-* Initiates a transfer when the descriptors have already been setup.
-*
-* This is a special case, and normally, the dma_transfer_xxx functions should
-* be used.
-*
-* @return
-* 0 Transfer was started successfully
-* -ENODEV Invalid handle
-*/
-/****************************************************************************/
-
-int dma_start_transfer(DMA_Handle_t handle)
-{
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config,
- devAttr->ring.virtAddr);
-
- /* Since we got this far, everything went successfully */
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_start_transfer);
-
-/****************************************************************************/
-/**
-* Stops a previously started DMA transfer.
-*
-* @return
-* 0 Transfer was stopped successfully
-* -ENODEV Invalid handle
-*/
-/****************************************************************************/
-
-int dma_stop_transfer(DMA_Handle_t handle)
-{
- DMA_Channel_t *channel;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
-
- dmacHw_stopTransfer(channel->dmacHwHandle);
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_stop_transfer);
-
-/****************************************************************************/
-/**
-* Waits for a DMA to complete by polling. This function is only intended
-* to be used for testing. Interrupts should be used for most DMA operations.
-*/
-/****************************************************************************/
-
-int dma_wait_transfer_done(DMA_Handle_t handle)
-{
- DMA_Channel_t *channel;
- dmacHw_TRANSFER_STATUS_e status;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
-
- while ((status =
- dmacHw_transferCompleted(channel->dmacHwHandle)) ==
- dmacHw_TRANSFER_STATUS_BUSY) {
- ;
- }
-
- if (status == dmacHw_TRANSFER_STATUS_ERROR) {
- printk(KERN_ERR "%s: DMA transfer failed\n", __func__);
- return -EIO;
- }
- return 0;
-}
-
-EXPORT_SYMBOL(dma_wait_transfer_done);
-
-/****************************************************************************/
-/**
-* Initiates a DMA, allocating the descriptors as required.
-*
-* @return
-* 0 Transfer was started successfully
-* -EINVAL Invalid device type for this kind of transfer
-* (i.e. the device is _DEV_TO_MEM and not _MEM_TO_DEV)
-*/
-/****************************************************************************/
-
-int dma_transfer(DMA_Handle_t handle, /* DMA Handle */
- dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */
- dma_addr_t srcData, /* Place to get data to write to device */
- dma_addr_t dstData, /* Pointer to device data address */
- size_t numBytes /* Number of bytes to transfer to the device */
- ) {
- DMA_Channel_t *channel;
- DMA_DeviceAttribute_t *devAttr;
- int rc = 0;
-
- channel = HandleToChannel(handle);
- if (channel == NULL) {
- return -ENODEV;
- }
-
- devAttr = &DMA_gDeviceAttribute[channel->devType];
-
- if (devAttr->config.transferType != transferType) {
- return -EINVAL;
- }
-
- /* We keep track of the information about the previous request for this */
- /* device, and if the attributes match, then we can use the descriptors we setup */
- /* the last time, and not have to reinitialize everything. */
-
- {
- rc =
- dma_alloc_descriptors(handle, transferType, srcData,
- dstData, numBytes);
- if (rc != 0) {
- return rc;
- }
- }
-
- /* And kick off the transfer */
-
- devAttr->numBytes = numBytes;
- devAttr->transferStartTime = timer_get_tick_count();
-
- dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config,
- devAttr->ring.virtAddr);
-
- /* Since we got this far, everything went successfully */
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_transfer);
-
-/****************************************************************************/
-/**
-* Set the callback function which will be called when a transfer completes.
-* If a NULL callback function is set, then no callback will occur.
-*
-* @note @a devHandler will be called from IRQ context.
-*
-* @return
-* 0 - Success
-* -ENODEV - Device handed in is invalid.
-*/
-/****************************************************************************/
-
-int dma_set_device_handler(DMA_Device_t dev, /* Device to set the callback for. */
- DMA_DeviceHandler_t devHandler, /* Function to call when the DMA completes */
- void *userData /* Pointer which will be passed to devHandler. */
- ) {
- DMA_DeviceAttribute_t *devAttr;
- unsigned long flags;
-
- if (!IsDeviceValid(dev)) {
- return -ENODEV;
- }
- devAttr = &DMA_gDeviceAttribute[dev];
-
- local_irq_save(flags);
-
- devAttr->userData = userData;
- devAttr->devHandler = devHandler;
-
- local_irq_restore(flags);
-
- return 0;
-}
-
-EXPORT_SYMBOL(dma_set_device_handler);