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video1394.c
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/*
* video1394.c - video driver for OHCI 1394 boards
* Copyright (C)1999,2000 Sebastien Rougeaux <[email protected]>
* Peter Schlaile <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* NOTES:
*
* ioctl return codes:
* EFAULT is only for invalid address for the argp
* EINVAL for out of range values
* EBUSY when trying to use an already used resource
* ESRCH when trying to free/stop a not used resource
* EAGAIN for resource allocation failure that could perhaps succeed later
* ENOTTY for unsupported ioctl request
*
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
#include <linux/timex.h>
#include <linux/mm.h>
#include <linux/compat.h>
#include <linux/cdev.h>
#include "dma.h"
#include "highlevel.h"
#include "hosts.h"
#include "ieee1394.h"
#include "ieee1394_core.h"
#include "ieee1394_hotplug.h"
#include "ieee1394_types.h"
#include "nodemgr.h"
#include "ohci1394.h"
#include "video1394.h"
#define ISO_CHANNELS 64
struct it_dma_prg {
struct dma_cmd begin;
quadlet_t data[4];
struct dma_cmd end;
quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
};
struct dma_iso_ctx {
struct ti_ohci *ohci;
int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
struct ohci1394_iso_tasklet iso_tasklet;
int channel;
int ctx;
int last_buffer;
int * next_buffer; /* For ISO Transmit of video packets
to write the correct SYT field
into the next block */
unsigned int num_desc;
unsigned int buf_size;
unsigned int frame_size;
unsigned int packet_size;
unsigned int left_size;
unsigned int nb_cmd;
struct dma_region dma;
struct dma_prog_region *prg_reg;
struct dma_cmd **ir_prg;
struct it_dma_prg **it_prg;
unsigned int *buffer_status;
unsigned int *buffer_prg_assignment;
struct timeval *buffer_time; /* time when the buffer was received */
unsigned int *last_used_cmd; /* For ISO Transmit with
variable sized packets only ! */
int ctrlClear;
int ctrlSet;
int cmdPtr;
int ctxMatch;
wait_queue_head_t waitq;
spinlock_t lock;
unsigned int syt_offset;
int flags;
struct list_head link;
};
struct file_ctx {
struct ti_ohci *ohci;
struct list_head context_list;
struct dma_iso_ctx *current_ctx;
};
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
#define VIDEO1394_DEBUG
#endif
#ifdef DBGMSG
#undef DBGMSG
#endif
#ifdef VIDEO1394_DEBUG
#define DBGMSG(card, fmt, args...) \
printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
#else
#define DBGMSG(card, fmt, args...) do {} while (0)
#endif
/* print general (card independent) information */
#define PRINT_G(level, fmt, args...) \
printk(level "video1394: " fmt "\n" , ## args)
/* print card specific information */
#define PRINT(level, card, fmt, args...) \
printk(level "video1394_%d: " fmt "\n" , card , ## args)
static void wakeup_dma_ir_ctx(unsigned long l);
static void wakeup_dma_it_ctx(unsigned long l);
static struct hpsb_highlevel video1394_highlevel;
static int free_dma_iso_ctx(struct dma_iso_ctx *d)
{
int i;
DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
if (d->iso_tasklet.link.next != NULL)
ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
dma_region_free(&d->dma);
if (d->prg_reg) {
for (i = 0; i < d->num_desc; i++)
dma_prog_region_free(&d->prg_reg[i]);
kfree(d->prg_reg);
}
kfree(d->ir_prg);
kfree(d->it_prg);
kfree(d->buffer_status);
kfree(d->buffer_prg_assignment);
kfree(d->buffer_time);
kfree(d->last_used_cmd);
kfree(d->next_buffer);
list_del(&d->link);
kfree(d);
return 0;
}
static struct dma_iso_ctx *
alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
int buf_size, int channel, unsigned int packet_size)
{
struct dma_iso_ctx *d;
int i;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
return NULL;
}
d->ohci = ohci;
d->type = type;
d->channel = channel;
d->num_desc = num_desc;
d->frame_size = buf_size;
d->buf_size = PAGE_ALIGN(buf_size);
d->last_buffer = -1;
INIT_LIST_HEAD(&d->link);
init_waitqueue_head(&d->waitq);
/* Init the regions for easy cleanup */
dma_region_init(&d->dma);
if (dma_region_alloc(&d->dma, (d->num_desc - 1) * d->buf_size, ohci->dev,
PCI_DMA_BIDIRECTIONAL)) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
free_dma_iso_ctx(d);
return NULL;
}
if (type == OHCI_ISO_RECEIVE)
ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
wakeup_dma_ir_ctx,
(unsigned long) d);
else
ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
wakeup_dma_it_ctx,
(unsigned long) d);
if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
free_dma_iso_ctx(d);
return NULL;
}
d->ctx = d->iso_tasklet.context;
d->prg_reg = kmalloc(d->num_desc * sizeof(*d->prg_reg), GFP_KERNEL);
if (!d->prg_reg) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
free_dma_iso_ctx(d);
return NULL;
}
/* Makes for easier cleanup */
for (i = 0; i < d->num_desc; i++)
dma_prog_region_init(&d->prg_reg[i]);
if (type == OHCI_ISO_RECEIVE) {
d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
d->ir_prg = kzalloc(d->num_desc * sizeof(*d->ir_prg),
GFP_KERNEL);
if (!d->ir_prg) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
free_dma_iso_ctx(d);
return NULL;
}
d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
d->left_size = (d->frame_size % PAGE_SIZE) ?
d->frame_size % PAGE_SIZE : PAGE_SIZE;
for (i = 0;i < d->num_desc; i++) {
if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
sizeof(struct dma_cmd), ohci->dev)) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
free_dma_iso_ctx(d);
return NULL;
}
d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
}
} else { /* OHCI_ISO_TRANSMIT */
d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
d->it_prg = kzalloc(d->num_desc * sizeof(*d->it_prg),
GFP_KERNEL);
if (!d->it_prg) {
PRINT(KERN_ERR, ohci->host->id,
"Failed to allocate dma it prg");
free_dma_iso_ctx(d);
return NULL;
}
d->packet_size = packet_size;
if (PAGE_SIZE % packet_size || packet_size>4096) {
PRINT(KERN_ERR, ohci->host->id,
"Packet size %d (page_size: %ld) "
"not yet supported\n",
packet_size, PAGE_SIZE);
free_dma_iso_ctx(d);
return NULL;
}
d->nb_cmd = d->frame_size / d->packet_size;
if (d->frame_size % d->packet_size) {
d->nb_cmd++;
d->left_size = d->frame_size % d->packet_size;
} else
d->left_size = d->packet_size;
for (i = 0; i < d->num_desc; i++) {
if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
sizeof(struct it_dma_prg), ohci->dev)) {
PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
free_dma_iso_ctx(d);
return NULL;
}
d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
}
}
d->buffer_status =
kzalloc(d->num_desc * sizeof(*d->buffer_status), GFP_KERNEL);
d->buffer_prg_assignment =
kzalloc(d->num_desc * sizeof(*d->buffer_prg_assignment), GFP_KERNEL);
d->buffer_time =
kzalloc(d->num_desc * sizeof(*d->buffer_time), GFP_KERNEL);
d->last_used_cmd =
kzalloc(d->num_desc * sizeof(*d->last_used_cmd), GFP_KERNEL);
d->next_buffer =
kzalloc(d->num_desc * sizeof(*d->next_buffer), GFP_KERNEL);
if (!d->buffer_status || !d->buffer_prg_assignment || !d->buffer_time ||
!d->last_used_cmd || !d->next_buffer) {
PRINT(KERN_ERR, ohci->host->id,
"Failed to allocate dma_iso_ctx member");
free_dma_iso_ctx(d);
return NULL;
}
spin_lock_init(&d->lock);
DBGMSG(ohci->host->id, "Iso %s DMA: %d buffers "
"of size %d allocated for a frame size %d, each with %d prgs",
(type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
d->num_desc - 1, d->buf_size, d->frame_size, d->nb_cmd);
return d;
}
static void reset_ir_status(struct dma_iso_ctx *d, int n)
{
int i;
d->ir_prg[n][0].status = cpu_to_le32(4);
d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
for (i = 2; i < d->nb_cmd - 1; i++)
d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
}
static void reprogram_dma_ir_prg(struct dma_iso_ctx *d, int n, int buffer, int flags)
{
struct dma_cmd *ir_prg = d->ir_prg[n];
unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
int i;
d->buffer_prg_assignment[n] = buffer;
ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
(unsigned long)d->dma.kvirt));
ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf + 4) - (unsigned long)d->dma.kvirt));
for (i=2;i<d->nb_cmd-1;i++) {
ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf+(i-1)*PAGE_SIZE) -
(unsigned long)d->dma.kvirt));
}
ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf+(i-1)*PAGE_SIZE) - (unsigned long)d->dma.kvirt));
}
static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
{
struct dma_cmd *ir_prg = d->ir_prg[n];
struct dma_prog_region *ir_reg = &d->prg_reg[n];
unsigned long buf = (unsigned long)d->dma.kvirt;
int i;
/* the first descriptor will read only 4 bytes */
ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_BRANCH | 4);
/* set the sync flag */
if (flags & VIDEO1394_SYNC_FRAMES)
ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
(unsigned long)d->dma.kvirt));
ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
/* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
if (d->nb_cmd > 2) {
/* The second descriptor will read PAGE_SIZE-4 bytes */
ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_BRANCH | (PAGE_SIZE-4));
ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
(unsigned long)d->dma.kvirt));
ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
for (i = 2; i < d->nb_cmd - 1; i++) {
ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_BRANCH | PAGE_SIZE);
ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf+(i-1)*PAGE_SIZE) -
(unsigned long)d->dma.kvirt));
ir_prg[i].branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
(i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
}
/* The last descriptor will generate an interrupt */
ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf+(i-1)*PAGE_SIZE) -
(unsigned long)d->dma.kvirt));
} else {
/* Only one DMA page is used. Read d->left_size immediately and */
/* generate an interrupt as this is also the last page. */
ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf + 4) - (unsigned long)d->dma.kvirt));
}
}
static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
{
struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
int i;
d->flags = flags;
ohci1394_stop_context(ohci, d->ctrlClear, NULL);
for (i=0;i<d->num_desc;i++) {
initialize_dma_ir_prg(d, i, flags);
reset_ir_status(d, i);
}
/* reset the ctrl register */
reg_write(ohci, d->ctrlClear, 0xf0000000);
/* Set bufferFill */
reg_write(ohci, d->ctrlSet, 0x80000000);
/* Set isoch header */
if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
reg_write(ohci, d->ctrlSet, 0x40000000);
/* Set the context match register to match on all tags,
sync for sync tag, and listen to d->channel */
reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
/* Set up isoRecvIntMask to generate interrupts */
reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
}
/* find which context is listening to this channel */
static struct dma_iso_ctx *
find_ctx(struct list_head *list, int type, int channel)
{
struct dma_iso_ctx *ctx;
list_for_each_entry(ctx, list, link) {
if (ctx->type == type && ctx->channel == channel)
return ctx;
}
return NULL;
}
static void wakeup_dma_ir_ctx(unsigned long l)
{
struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
int i;
spin_lock(&d->lock);
for (i = 0; i < d->num_desc; i++) {
if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
reset_ir_status(d, i);
d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
do_gettimeofday(&d->buffer_time[d->buffer_prg_assignment[i]]);
dma_region_sync_for_cpu(&d->dma,
d->buffer_prg_assignment[i] * d->buf_size,
d->buf_size);
}
}
spin_unlock(&d->lock);
if (waitqueue_active(&d->waitq))
wake_up_interruptible(&d->waitq);
}
static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
int n)
{
unsigned char* buf = d->dma.kvirt + n * d->buf_size;
u32 cycleTimer;
u32 timeStamp;
if (n == -1) {
return;
}
cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
+ (cycleTimer & 0xf000)) & 0xffff;
buf[6] = timeStamp >> 8;
buf[7] = timeStamp & 0xff;
/* if first packet is empty packet, then put timestamp into the next full one too */
if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
buf += d->packet_size;
buf[6] = timeStamp >> 8;
buf[7] = timeStamp & 0xff;
}
/* do the next buffer frame too in case of irq latency */
n = d->next_buffer[n];
if (n == -1) {
return;
}
buf = d->dma.kvirt + n * d->buf_size;
timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
buf[6] = timeStamp >> 8;
buf[7] = timeStamp & 0xff;
/* if first packet is empty packet, then put timestamp into the next full one too */
if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
buf += d->packet_size;
buf[6] = timeStamp >> 8;
buf[7] = timeStamp & 0xff;
}
#if 0
printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
curr, n, cycleTimer, timeStamp);
#endif
}
static void wakeup_dma_it_ctx(unsigned long l)
{
struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
struct ti_ohci *ohci = d->ohci;
int i;
spin_lock(&d->lock);
for (i = 0; i < d->num_desc; i++) {
if (d->it_prg[i][d->last_used_cmd[i]].end.status &
cpu_to_le32(0xFFFF0000)) {
int next = d->next_buffer[i];
put_timestamp(ohci, d, next);
d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
}
}
spin_unlock(&d->lock);
if (waitqueue_active(&d->waitq))
wake_up_interruptible(&d->waitq);
}
static void reprogram_dma_it_prg(struct dma_iso_ctx *d, int n, int buffer)
{
struct it_dma_prg *it_prg = d->it_prg[n];
unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
int i;
d->buffer_prg_assignment[n] = buffer;
for (i=0;i<d->nb_cmd;i++) {
it_prg[i].end.address =
cpu_to_le32(dma_region_offset_to_bus(&d->dma,
(buf+i*d->packet_size) - (unsigned long)d->dma.kvirt));
}
}
static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
{
struct it_dma_prg *it_prg = d->it_prg[n];
struct dma_prog_region *it_reg = &d->prg_reg[n];
unsigned long buf = (unsigned long)d->dma.kvirt;
int i;
d->last_used_cmd[n] = d->nb_cmd - 1;
for (i=0;i<d->nb_cmd;i++) {
it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
DMA_CTL_IMMEDIATE | 8) ;
it_prg[i].begin.address = 0;
it_prg[i].begin.status = 0;
it_prg[i].data[0] = cpu_to_le32(
(IEEE1394_SPEED_100 << 16)
| (/* tag */ 1 << 14)
| (d->channel << 8)
| (TCODE_ISO_DATA << 4));
if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
it_prg[i].data[2] = 0;
it_prg[i].data[3] = 0;
it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
DMA_CTL_BRANCH);
it_prg[i].end.address =
cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
(unsigned long)d->dma.kvirt));
if (i<d->nb_cmd-1) {
it_prg[i].end.control |= cpu_to_le32(d->packet_size);
it_prg[i].begin.branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
it_prg[i].end.branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
} else {
/* the last prg generates an interrupt */
it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
DMA_CTL_IRQ | d->left_size);
/* the last prg doesn't branch */
it_prg[i].begin.branchAddress = 0;
it_prg[i].end.branchAddress = 0;
}
it_prg[i].end.status = 0;
}
}
static void initialize_dma_it_prg_var_packet_queue(
struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
struct ti_ohci *ohci)
{
struct it_dma_prg *it_prg = d->it_prg[n];
struct dma_prog_region *it_reg = &d->prg_reg[n];
int i;
#if 0
if (n != -1) {
put_timestamp(ohci, d, n);
}
#endif
d->last_used_cmd[n] = d->nb_cmd - 1;
for (i = 0; i < d->nb_cmd; i++) {
unsigned int size;
if (packet_sizes[i] > d->packet_size) {
size = d->packet_size;
} else {
size = packet_sizes[i];
}
it_prg[i].data[1] = cpu_to_le32(size << 16);
it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
it_prg[i].end.control |= cpu_to_le32(size);
it_prg[i].begin.branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
it_prg[i].end.branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
} else {
/* the last prg generates an interrupt */
it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
DMA_CTL_IRQ | size);
/* the last prg doesn't branch */
it_prg[i].begin.branchAddress = 0;
it_prg[i].end.branchAddress = 0;
d->last_used_cmd[n] = i;
break;
}
}
}
static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
unsigned int syt_offset, int flags)
{
struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
int i;
d->flags = flags;
d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
ohci1394_stop_context(ohci, d->ctrlClear, NULL);
for (i=0;i<d->num_desc;i++)
initialize_dma_it_prg(d, i, sync_tag);
/* Set up isoRecvIntMask to generate interrupts */
reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
}
static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
unsigned int buffer)
{
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&d->lock, flags);
ret = d->buffer_status[buffer];
spin_unlock_irqrestore(&d->lock, flags);
return ret;
}
static long video1394_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct file_ctx *ctx = file->private_data;
struct ti_ohci *ohci = ctx->ohci;
unsigned long flags;
void __user *argp = (void __user *)arg;
switch(cmd)
{
case VIDEO1394_IOC_LISTEN_CHANNEL:
case VIDEO1394_IOC_TALK_CHANNEL:
{
struct video1394_mmap v;
u64 mask;
struct dma_iso_ctx *d;
int i;
if (copy_from_user(&v, argp, sizeof(v)))
return -EFAULT;
/* if channel < 0, find lowest available one */
if (v.channel < 0) {
mask = (u64)0x1;
for (i=0; ; i++) {
if (i == ISO_CHANNELS) {
PRINT(KERN_ERR, ohci->host->id,
"No free channel found");
return -EAGAIN;
}
if (!(ohci->ISO_channel_usage & mask)) {
v.channel = i;
PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
break;
}
mask = mask << 1;
}
} else if (v.channel >= ISO_CHANNELS) {
PRINT(KERN_ERR, ohci->host->id,
"Iso channel %d out of bounds", v.channel);
return -EINVAL;
} else {
mask = (u64)0x1<<v.channel;
}
DBGMSG(ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
(u32)(mask>>32),(u32)(mask&0xffffffff),
(u32)(ohci->ISO_channel_usage>>32),
(u32)(ohci->ISO_channel_usage&0xffffffff));
if (ohci->ISO_channel_usage & mask) {
PRINT(KERN_ERR, ohci->host->id,
"Channel %d is already taken", v.channel);
return -EBUSY;
}
if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
PRINT(KERN_ERR, ohci->host->id,
"Invalid %d length buffer requested",v.buf_size);
return -EINVAL;
}
if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
PRINT(KERN_ERR, ohci->host->id,
"Invalid %d buffers requested",v.nb_buffers);
return -EINVAL;
}
if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
PRINT(KERN_ERR, ohci->host->id,
"%d buffers of size %d bytes is too big",
v.nb_buffers, v.buf_size);
return -EINVAL;
}
if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
v.nb_buffers + 1, v.buf_size,
v.channel, 0);
if (d == NULL) {
PRINT(KERN_ERR, ohci->host->id,
"Couldn't allocate ir context");
return -EAGAIN;
}
initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
ctx->current_ctx = d;
v.buf_size = d->buf_size;
list_add_tail(&d->link, &ctx->context_list);
DBGMSG(ohci->host->id,
"iso context %d listen on channel %d",
d->ctx, v.channel);
}
else {
d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
v.nb_buffers + 1, v.buf_size,
v.channel, v.packet_size);
if (d == NULL) {
PRINT(KERN_ERR, ohci->host->id,
"Couldn't allocate it context");
return -EAGAIN;
}
initialize_dma_it_ctx(d, v.sync_tag,
v.syt_offset, v.flags);
ctx->current_ctx = d;
v.buf_size = d->buf_size;
list_add_tail(&d->link, &ctx->context_list);
DBGMSG(ohci->host->id,
"Iso context %d talk on channel %d", d->ctx,
v.channel);
}
if (copy_to_user(argp, &v, sizeof(v))) {
/* FIXME : free allocated dma resources */
return -EFAULT;
}
ohci->ISO_channel_usage |= mask;
return 0;
}
case VIDEO1394_IOC_UNLISTEN_CHANNEL:
case VIDEO1394_IOC_UNTALK_CHANNEL:
{
int channel;
u64 mask;
struct dma_iso_ctx *d;
if (copy_from_user(&channel, argp, sizeof(int)))
return -EFAULT;
if (channel < 0 || channel >= ISO_CHANNELS) {
PRINT(KERN_ERR, ohci->host->id,
"Iso channel %d out of bound", channel);
return -EINVAL;
}
mask = (u64)0x1<<channel;
if (!(ohci->ISO_channel_usage & mask)) {
PRINT(KERN_ERR, ohci->host->id,
"Channel %d is not being used", channel);
return -ESRCH;
}
/* Mark this channel as unused */
ohci->ISO_channel_usage &= ~mask;
if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
else
d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
if (d == NULL) return -ESRCH;
DBGMSG(ohci->host->id, "Iso context %d "
"stop talking on channel %d", d->ctx, channel);
free_dma_iso_ctx(d);
return 0;
}
case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
{
struct video1394_wait v;
struct dma_iso_ctx *d;
int next_prg;
if (unlikely(copy_from_user(&v, argp, sizeof(v))))
return -EFAULT;
d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
if (unlikely(d == NULL))
return -EFAULT;
if (unlikely(v.buffer >= d->num_desc - 1)) {
PRINT(KERN_ERR, ohci->host->id,
"Buffer %d out of range",v.buffer);
return -EINVAL;
}
spin_lock_irqsave(&d->lock,flags);
if (unlikely(d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED)) {
PRINT(KERN_ERR, ohci->host->id,
"Buffer %d is already used",v.buffer);
spin_unlock_irqrestore(&d->lock,flags);
return -EBUSY;
}
d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
next_prg = (d->last_buffer + 1) % d->num_desc;
if (d->last_buffer>=0)
d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0)
& 0xfffffff0) | 0x1);
d->last_buffer = next_prg;
reprogram_dma_ir_prg(d, d->last_buffer, v.buffer, d->flags);
d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress = 0;
spin_unlock_irqrestore(&d->lock,flags);
if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
{
DBGMSG(ohci->host->id, "Starting iso DMA ctx=%d",d->ctx);
/* Tell the controller where the first program is */
reg_write(ohci, d->cmdPtr,
dma_prog_region_offset_to_bus(&d->prg_reg[d->last_buffer], 0) | 0x1);
/* Run IR context */
reg_write(ohci, d->ctrlSet, 0x8000);
}
else {
/* Wake up dma context if necessary */
if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
DBGMSG(ohci->host->id,
"Waking up iso dma ctx=%d", d->ctx);
reg_write(ohci, d->ctrlSet, 0x1000);
}
}
return 0;
}
case VIDEO1394_IOC_LISTEN_WAIT_BUFFER:
case VIDEO1394_IOC_LISTEN_POLL_BUFFER:
{
struct video1394_wait v;
struct dma_iso_ctx *d;
int i = 0;
if (unlikely(copy_from_user(&v, argp, sizeof(v))))
return -EFAULT;
d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
if (unlikely(d == NULL))
return -EFAULT;
if (unlikely(v.buffer > d->num_desc - 1)) {
PRINT(KERN_ERR, ohci->host->id,
"Buffer %d out of range",v.buffer);
return -EINVAL;
}
/*
* I change the way it works so that it returns
* the last received frame.
*/
spin_lock_irqsave(&d->lock, flags);
switch(d->buffer_status[v.buffer]) {
case VIDEO1394_BUFFER_READY:
d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
break;
case VIDEO1394_BUFFER_QUEUED:
if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
/* for polling, return error code EINTR */
spin_unlock_irqrestore(&d->lock, flags);
return -EINTR;
}
spin_unlock_irqrestore(&d->lock, flags);
wait_event_interruptible(d->waitq,
video1394_buffer_state(d, v.buffer) ==
VIDEO1394_BUFFER_READY);
if (signal_pending(current))
return -EINTR;
spin_lock_irqsave(&d->lock, flags);
d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
break;
default:
PRINT(KERN_ERR, ohci->host->id,
"Buffer %d is not queued",v.buffer);
spin_unlock_irqrestore(&d->lock, flags);
return -ESRCH;
}