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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-29 18:19:22 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-29 23:09:18 +0200
commit872e330e38806d835bd6c311c93ab998e2fb9058 (patch)
tree92497ce79b1157761b1aebdb63b8d74f68d42c15 /drivers
parentae2a97661482c1d0f1aa41b837da95054d0e9a1b (diff)
downloadop-kernel-dev-872e330e38806d835bd6c311c93ab998e2fb9058.zip
op-kernel-dev-872e330e38806d835bd6c311c93ab998e2fb9058.tar.gz
firewire: add isochronous multichannel reception
This adds the DMA context programming and userspace ABI for multichannel reception, i.e. for listening on multiple channel numbers by means of a single DMA context. The use case is reception of more streams than there are IR DMA units offered by the link layer. This is already implemented by the older ohci1394 + ieee1394 + raw1394 stack. And as discussed recently on linux1394-devel, this feature is occasionally used in practice. The big drawbacks of this mode are that buffer layout and interrupt generation necessarily differ from single-channel reception: Headers and trailers are not stripped from packets, packets are not aligned with buffer chunks, interrupts are per buffer chunk, not per packet. These drawbacks also cause a rather hefty code footprint to support this rarely used OHCI-1394 feature. (367 lines added, among them 94 lines of added userspace ABI documentation.) This implementation enforces that a multichannel reception context may only listen to channels to which no single-channel context on the same link layer is presently listening to. OHCI-1394 would allow to overlay single-channel contexts by the multi-channel context, but this would be a departure from the present first-come-first-served policy of IR context creation. The implementation is heavily based on an earlier one by Jay Fenlason. Thanks Jay. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firewire/core-cdev.c93
-rw-r--r--drivers/firewire/core-iso.c32
-rw-r--r--drivers/firewire/core.h2
-rw-r--r--drivers/firewire/ohci.c316
4 files changed, 346 insertions, 97 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index cf989e1..ba23646 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -193,6 +193,11 @@ struct iso_interrupt_event {
struct fw_cdev_event_iso_interrupt interrupt;
};
+struct iso_interrupt_mc_event {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt_mc interrupt;
+};
+
struct iso_resource_event {
struct event event;
struct fw_cdev_event_iso_resource iso_resource;
@@ -415,6 +420,7 @@ union ioctl_arg {
struct fw_cdev_get_cycle_timer2 get_cycle_timer2;
struct fw_cdev_send_phy_packet send_phy_packet;
struct fw_cdev_receive_phy_packets receive_phy_packets;
+ struct fw_cdev_set_iso_channels set_iso_channels;
};
static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
@@ -932,26 +938,54 @@ static void iso_callback(struct fw_iso_context *context, u32 cycle,
sizeof(e->interrupt) + header_length, NULL, 0);
}
+static void iso_mc_callback(struct fw_iso_context *context,
+ dma_addr_t completed, void *data)
+{
+ struct client *client = data;
+ struct iso_interrupt_mc_event *e;
+
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (e == NULL) {
+ fw_notify("Out of memory when allocating event\n");
+ return;
+ }
+ e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL;
+ e->interrupt.closure = client->iso_closure;
+ e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer,
+ completed);
+ queue_event(client, &e->event, &e->interrupt,
+ sizeof(e->interrupt), NULL, 0);
+}
+
static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
{
struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
struct fw_iso_context *context;
+ fw_iso_callback_t cb;
BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
- FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE);
-
- if (a->channel > 63)
- return -EINVAL;
+ FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE ||
+ FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL !=
+ FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL);
switch (a->type) {
- case FW_ISO_CONTEXT_RECEIVE:
- if (a->header_size < 4 || (a->header_size & 3))
+ case FW_ISO_CONTEXT_TRANSMIT:
+ if (a->speed > SCODE_3200 || a->channel > 63)
return -EINVAL;
+
+ cb = iso_callback;
break;
- case FW_ISO_CONTEXT_TRANSMIT:
- if (a->speed > SCODE_3200)
+ case FW_ISO_CONTEXT_RECEIVE:
+ if (a->header_size < 4 || (a->header_size & 3) ||
+ a->channel > 63)
return -EINVAL;
+
+ cb = iso_callback;
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ cb = (fw_iso_callback_t)iso_mc_callback;
break;
default:
@@ -959,8 +993,7 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
}
context = fw_iso_context_create(client->device->card, a->type,
- a->channel, a->speed, a->header_size,
- iso_callback, client);
+ a->channel, a->speed, a->header_size, cb, client);
if (IS_ERR(context))
return PTR_ERR(context);
@@ -980,6 +1013,17 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
return 0;
}
+static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg)
+{
+ struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels;
+ struct fw_iso_context *ctx = client->iso_context;
+
+ if (ctx == NULL || a->handle != 0)
+ return -EINVAL;
+
+ return fw_iso_context_set_channels(ctx, &a->channels);
+}
+
/* Macros for decoding the iso packet control header. */
#define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff)
#define GET_INTERRUPT(v) (((v) >> 16) & 0x01)
@@ -993,7 +1037,7 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
struct fw_cdev_queue_iso *a = &arg->queue_iso;
struct fw_cdev_iso_packet __user *p, *end, *next;
struct fw_iso_context *ctx = client->iso_context;
- unsigned long payload, buffer_end, transmit_header_bytes;
+ unsigned long payload, buffer_end, transmit_header_bytes = 0;
u32 control;
int count;
struct {
@@ -1013,7 +1057,6 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
* use the indirect payload, the iso buffer need not be mapped
* and the a->data pointer is ignored.
*/
-
payload = (unsigned long)a->data - client->vm_start;
buffer_end = client->buffer.page_count << PAGE_SHIFT;
if (a->data == 0 || client->buffer.pages == NULL ||
@@ -1022,8 +1065,10 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
buffer_end = 0;
}
- p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
+ if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3)
+ return -EINVAL;
+ p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets);
if (!access_ok(VERIFY_READ, p, a->size))
return -EFAULT;
@@ -1039,19 +1084,24 @@ static int ioctl_queue_iso(struct client *client, union ioctl_arg *arg)
u.packet.sy = GET_SY(control);
u.packet.header_length = GET_HEADER_LENGTH(control);
- if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
- if (u.packet.header_length % 4 != 0)
+ switch (ctx->type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
+ if (u.packet.header_length & 3)
return -EINVAL;
transmit_header_bytes = u.packet.header_length;
- } else {
- /*
- * We require that header_length is a multiple of
- * the fixed header size, ctx->header_size.
- */
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE:
if (u.packet.header_length == 0 ||
u.packet.header_length % ctx->header_size != 0)
return -EINVAL;
- transmit_header_bytes = 0;
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ if (u.packet.payload_length == 0 ||
+ u.packet.payload_length & 3)
+ return -EINVAL;
+ break;
}
next = (struct fw_cdev_iso_packet __user *)
@@ -1534,6 +1584,7 @@ static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = {
[0x14] = ioctl_get_cycle_timer2,
[0x15] = ioctl_send_phy_packet,
[0x16] = ioctl_receive_phy_packets,
+ [0x17] = ioctl_set_iso_channels,
};
static int dispatch_ioctl(struct client *client,
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 4fe932e..0c8e662 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -117,6 +117,23 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
}
EXPORT_SYMBOL(fw_iso_buffer_destroy);
+/* Convert DMA address to offset into virtually contiguous buffer. */
+size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
+{
+ int i;
+ dma_addr_t address;
+ ssize_t offset;
+
+ for (i = 0; i < buffer->page_count; i++) {
+ address = page_private(buffer->pages[i]);
+ offset = (ssize_t)completed - (ssize_t)address;
+ if (offset > 0 && offset <= PAGE_SIZE)
+ return (i << PAGE_SHIFT) + offset;
+ }
+
+ return 0;
+}
+
struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
int type, int channel, int speed, size_t header_size,
fw_iso_callback_t callback, void *callback_data)
@@ -133,7 +150,7 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
ctx->channel = channel;
ctx->speed = speed;
ctx->header_size = header_size;
- ctx->callback = callback;
+ ctx->callback.sc = callback;
ctx->callback_data = callback_data;
return ctx;
@@ -142,9 +159,7 @@ EXPORT_SYMBOL(fw_iso_context_create);
void fw_iso_context_destroy(struct fw_iso_context *ctx)
{
- struct fw_card *card = ctx->card;
-
- card->driver->free_iso_context(ctx);
+ ctx->card->driver->free_iso_context(ctx);
}
EXPORT_SYMBOL(fw_iso_context_destroy);
@@ -155,14 +170,17 @@ int fw_iso_context_start(struct fw_iso_context *ctx,
}
EXPORT_SYMBOL(fw_iso_context_start);
+int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
+{
+ return ctx->card->driver->set_iso_channels(ctx, channels);
+}
+
int fw_iso_context_queue(struct fw_iso_context *ctx,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
- struct fw_card *card = ctx->card;
-
- return card->driver->queue_iso(ctx, packet, buffer, payload);
+ return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);
}
EXPORT_SYMBOL(fw_iso_context_queue);
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 28621e4..e6239f9 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -90,6 +90,8 @@ struct fw_card_driver {
int (*start_iso)(struct fw_iso_context *ctx,
s32 cycle, u32 sync, u32 tags);
+ int (*set_iso_channels)(struct fw_iso_context *ctx, u64 *channels);
+
int (*queue_iso)(struct fw_iso_context *ctx,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 2e4b425..4bda1c1 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -190,11 +190,13 @@ struct fw_ohci {
struct context at_request_ctx;
struct context at_response_ctx;
- u32 it_context_mask;
+ u32 it_context_mask; /* unoccupied IT contexts */
struct iso_context *it_context_list;
- u64 ir_context_channels;
- u32 ir_context_mask;
+ u64 ir_context_channels; /* unoccupied channels */
+ u32 ir_context_mask; /* unoccupied IR contexts */
struct iso_context *ir_context_list;
+ u64 mc_channels; /* channels in use by the multichannel IR context */
+ bool mc_allocated;
__be32 *config_rom;
dma_addr_t config_rom_bus;
@@ -2197,10 +2199,9 @@ static int handle_ir_packet_per_buffer(struct context *context,
__le32 *ir_header;
void *p;
- for (pd = d; pd <= last; pd++) {
+ for (pd = d; pd <= last; pd++)
if (pd->transfer_status)
break;
- }
if (pd > last)
/* Descriptor(s) not done yet, stop iteration */
return 0;
@@ -2210,16 +2211,38 @@ static int handle_ir_packet_per_buffer(struct context *context,
if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS) {
ir_header = (__le32 *) p;
- ctx->base.callback(&ctx->base,
- le32_to_cpu(ir_header[0]) & 0xffff,
- ctx->header_length, ctx->header,
- ctx->base.callback_data);
+ ctx->base.callback.sc(&ctx->base,
+ le32_to_cpu(ir_header[0]) & 0xffff,
+ ctx->header_length, ctx->header,
+ ctx->base.callback_data);
ctx->header_length = 0;
}
return 1;
}
+/* d == last because each descriptor block is only a single descriptor. */
+static int handle_ir_buffer_fill(struct context *context,
+ struct descriptor *d,
+ struct descriptor *last)
+{
+ struct iso_context *ctx =
+ container_of(context, struct iso_context, context);
+
+ if (!last->transfer_status)
+ /* Descriptor(s) not done yet, stop iteration */
+ return 0;
+
+ if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS)
+ ctx->base.callback.mc(&ctx->base,
+ le32_to_cpu(last->data_address) +
+ le16_to_cpu(last->req_count) -
+ le16_to_cpu(last->res_count),
+ ctx->base.callback_data);
+
+ return 1;
+}
+
static int handle_it_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
@@ -2245,72 +2268,118 @@ static int handle_it_packet(struct context *context,
ctx->header_length += 4;
}
if (le16_to_cpu(last->control) & DESCRIPTOR_IRQ_ALWAYS) {
- ctx->base.callback(&ctx->base, le16_to_cpu(last->res_count),
- ctx->header_length, ctx->header,
- ctx->base.callback_data);
+ ctx->base.callback.sc(&ctx->base, le16_to_cpu(last->res_count),
+ ctx->header_length, ctx->header,
+ ctx->base.callback_data);
ctx->header_length = 0;
}
return 1;
}
+static void set_multichannel_mask(struct fw_ohci *ohci, u64 channels)
+{
+ u32 hi = channels >> 32, lo = channels;
+
+ reg_write(ohci, OHCI1394_IRMultiChanMaskHiClear, ~hi);
+ reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, ~lo);
+ reg_write(ohci, OHCI1394_IRMultiChanMaskHiSet, hi);
+ reg_write(ohci, OHCI1394_IRMultiChanMaskLoSet, lo);
+ mmiowb();
+ ohci->mc_channels = channels;
+}
+
static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
int type, int channel, size_t header_size)
{
struct fw_ohci *ohci = fw_ohci(card);
- struct iso_context *ctx, *list;
- descriptor_callback_t callback;
- u64 *channels, dont_care = ~0ULL;
- u32 *mask, regs;
+ struct iso_context *uninitialized_var(ctx);
+ descriptor_callback_t uninitialized_var(callback);
+ u64 *uninitialized_var(channels);
+ u32 *uninitialized_var(mask), uninitialized_var(regs);
unsigned long flags;
- int index, ret = -ENOMEM;
+ int index, ret = -EBUSY;
- if (type == FW_ISO_CONTEXT_TRANSMIT) {
- channels = &dont_care;
- mask = &ohci->it_context_mask;
- list = ohci->it_context_list;
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ switch (type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
+ mask = &ohci->it_context_mask;
callback = handle_it_packet;
- } else {
+ index = ffs(*mask) - 1;
+ if (index >= 0) {
+ *mask &= ~(1 << index);
+ regs = OHCI1394_IsoXmitContextBase(index);
+ ctx = &ohci->it_context_list[index];
+ }
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE:
channels = &ohci->ir_context_channels;
- mask = &ohci->ir_context_mask;
- list = ohci->ir_context_list;
+ mask = &ohci->ir_context_mask;
callback = handle_ir_packet_per_buffer;
- }
+ index = *channels & 1ULL << channel ? ffs(*mask) - 1 : -1;
+ if (index >= 0) {
+ *channels &= ~(1ULL << channel);
+ *mask &= ~(1 << index);
+ regs = OHCI1394_IsoRcvContextBase(index);
+ ctx = &ohci->ir_context_list[index];
+ }
+ break;
- spin_lock_irqsave(&ohci->lock, flags);
- index = *channels & 1ULL << channel ? ffs(*mask) - 1 : -1;
- if (index >= 0) {
- *channels &= ~(1ULL << channel);
- *mask &= ~(1 << index);
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ mask = &ohci->ir_context_mask;
+ callback = handle_ir_buffer_fill;
+ index = !ohci->mc_allocated ? ffs(*mask) - 1 : -1;
+ if (index >= 0) {
+ ohci->mc_allocated = true;
+ *mask &= ~(1 << index);
+ regs = OHCI1394_IsoRcvContextBase(index);
+ ctx = &ohci->ir_context_list[index];
+ }
+ break;
+
+ default:
+ index = -1;
+ ret = -ENOSYS;
}
+
spin_unlock_irqrestore(&ohci->lock, flags);
if (index < 0)
- return ERR_PTR(-EBUSY);
-
- if (type == FW_ISO_CONTEXT_TRANSMIT)
- regs = OHCI1394_IsoXmitContextBase(index);
- else
- regs = OHCI1394_IsoRcvContextBase(index);
+ return ERR_PTR(ret);
- ctx = &list[index];
memset(ctx, 0, sizeof(*ctx));
ctx->header_length = 0;
ctx->header = (void *) __get_free_page(GFP_KERNEL);
- if (ctx->header == NULL)
+ if (ctx->header == NULL) {
+ ret = -ENOMEM;
goto out;
-
+ }
ret = context_init(&ctx->context, ohci, regs, callback);
if (ret < 0)
goto out_with_header;
+ if (type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
+ set_multichannel_mask(ohci, 0);
+
return &ctx->base;
out_with_header:
free_page((unsigned long)ctx->header);
out:
spin_lock_irqsave(&ohci->lock, flags);
- *channels |= 1ULL << channel;
+
+ switch (type) {
+ case FW_ISO_CONTEXT_RECEIVE:
+ *channels |= 1ULL << channel;
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ ohci->mc_allocated = false;
+ break;
+ }
*mask |= 1 << index;
+
spin_unlock_irqrestore(&ohci->lock, flags);
return ERR_PTR(ret);
@@ -2321,10 +2390,11 @@ static int ohci_start_iso(struct fw_iso_context *base,
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
struct fw_ohci *ohci = ctx->context.ohci;
- u32 control, match;
+ u32 control = IR_CONTEXT_ISOCH_HEADER, match;
int index;
- if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ switch (ctx->base.type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
index = ctx - ohci->it_context_list;
match = 0;
if (cycle >= 0)
@@ -2334,9 +2404,13 @@ static int ohci_start_iso(struct fw_iso_context *base,
reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);
reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
context_run(&ctx->context, match);
- } else {
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ control |= IR_CONTEXT_BUFFER_FILL|IR_CONTEXT_MULTI_CHANNEL_MODE;
+ /* fall through */
+ case FW_ISO_CONTEXT_RECEIVE:
index = ctx - ohci->ir_context_list;
- control = IR_CONTEXT_ISOCH_HEADER;
match = (tags << 28) | (sync << 8) | ctx->base.channel;
if (cycle >= 0) {
match |= (cycle & 0x07fff) << 12;
@@ -2347,6 +2421,7 @@ static int ohci_start_iso(struct fw_iso_context *base,
reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
reg_write(ohci, CONTEXT_MATCH(ctx->context.regs), match);
context_run(&ctx->context, control);
+ break;
}
return 0;
@@ -2358,12 +2433,17 @@ static int ohci_stop_iso(struct fw_iso_context *base)
struct iso_context *ctx = container_of(base, struct iso_context, base);
int index;
- if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ switch (ctx->base.type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
index = ctx - ohci->it_context_list;
reg_write(ohci, OHCI1394_IsoXmitIntMaskClear, 1 << index);
- } else {
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE:
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
index = ctx - ohci->ir_context_list;
reg_write(ohci, OHCI1394_IsoRecvIntMaskClear, 1 << index);
+ break;
}
flush_writes(ohci);
context_stop(&ctx->context);
@@ -2384,24 +2464,65 @@ static void ohci_free_iso_context(struct fw_iso_context *base)
spin_lock_irqsave(&ohci->lock, flags);
- if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
+ switch (base->type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
index = ctx - ohci->it_context_list;
ohci->it_context_mask |= 1 << index;
- } else {
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE:
index = ctx - ohci->ir_context_list;
ohci->ir_context_mask |= 1 << index;
ohci->ir_context_channels |= 1ULL << base->channel;
+ break;
+
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ index = ctx - ohci->ir_context_list;
+ ohci->ir_context_mask |= 1 << index;
+ ohci->ir_context_channels |= ohci->mc_channels;
+ ohci->mc_channels = 0;
+ ohci->mc_allocated = false;
+ break;
}
spin_unlock_irqrestore(&ohci->lock, flags);
}
-static int ohci_queue_iso_transmit(struct fw_iso_context *base,
- struct fw_iso_packet *packet,
- struct fw_iso_buffer *buffer,
- unsigned long payload)
+static int ohci_set_iso_channels(struct fw_iso_context *base, u64 *channels)
+{
+ struct fw_ohci *ohci = fw_ohci(base->card);
+ unsigned long flags;
+ int ret;
+
+ switch (base->type) {
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+
+ spin_lock_irqsave(&ohci->lock, flags);
+
+ /* Don't allow multichannel to grab other contexts' channels. */
+ if (~ohci->ir_context_channels & ~ohci->mc_channels & *channels) {
+ *channels = ohci->ir_context_channels;
+ ret = -EBUSY;
+ } else {
+ set_multichannel_mask(ohci, *channels);
+ ret = 0;
+ }
+
+ spin_unlock_irqrestore(&ohci->lock, flags);
+
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int queue_iso_transmit(struct iso_context *ctx,
+ struct fw_iso_packet *packet,
+ struct fw_iso_buffer *buffer,
+ unsigned long payload)
{
- struct iso_context *ctx = container_of(base, struct iso_context, base);
struct descriptor *d, *last, *pd;
struct fw_iso_packet *p;
__le32 *header;
@@ -2497,14 +2618,12 @@ static int ohci_queue_iso_transmit(struct fw_iso_context *base,
return 0;
}
-static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
- struct fw_iso_packet *packet,
- struct fw_iso_buffer *buffer,
- unsigned long payload)
+static int queue_iso_packet_per_buffer(struct iso_context *ctx,
+ struct fw_iso_packet *packet,
+ struct fw_iso_buffer *buffer,
+ unsigned long payload)
{
- struct iso_context *ctx = container_of(base, struct iso_context, base);
struct descriptor *d, *pd;
- struct fw_iso_packet *p = packet;
dma_addr_t d_bus, page_bus;
u32 z, header_z, rest;
int i, j, length;
@@ -2514,14 +2633,14 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
* The OHCI controller puts the isochronous header and trailer in the
* buffer, so we need at least 8 bytes.
*/
- packet_count = p->header_length / ctx->base.header_size;
+ packet_count = packet->header_length / ctx->base.header_size;
header_size = max(ctx->base.header_size, (size_t)8);
/* Get header size in number of descriptors. */
header_z = DIV_ROUND_UP(header_size, sizeof(*d));
page = payload >> PAGE_SHIFT;
offset = payload & ~PAGE_MASK;
- payload_per_buffer = p->payload_length / packet_count;
+ payload_per_buffer = packet->payload_length / packet_count;
for (i = 0; i < packet_count; i++) {
/* d points to the header descriptor */
@@ -2533,7 +2652,7 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
d->control = cpu_to_le16(DESCRIPTOR_STATUS |
DESCRIPTOR_INPUT_MORE);
- if (p->skip && i == 0)
+ if (packet->skip && i == 0)
d->control |= cpu_to_le16(DESCRIPTOR_WAIT);
d->req_count = cpu_to_le16(header_size);
d->res_count = d->req_count;
@@ -2566,7 +2685,7 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
pd->control = cpu_to_le16(DESCRIPTOR_STATUS |
DESCRIPTOR_INPUT_LAST |
DESCRIPTOR_BRANCH_ALWAYS);
- if (p->interrupt && i == packet_count - 1)
+ if (packet->interrupt && i == packet_count - 1)
pd->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);
context_append(&ctx->context, d, z, header_z);
@@ -2575,6 +2694,58 @@ static int ohci_queue_iso_receive_packet_per_buffer(struct fw_iso_context *base,
return 0;
}
+static int queue_iso_buffer_fill(struct iso_context *ctx,
+ struct fw_iso_packet *packet,
+ struct fw_iso_buffer *buffer,
+ unsigned long payload)
+{
+ struct descriptor *d;
+ dma_addr_t d_bus, page_bus;
+ int page, offset, rest, z, i, length;
+
+ page = payload >> PAGE_SHIFT;
+ offset = payload & ~PAGE_MASK;
+ rest = packet->payload_length;
+
+ /* We need one descriptor for each page in the buffer. */
+ z = DIV_ROUND_UP(offset + rest, PAGE_SIZE);
+
+ if (WARN_ON(offset & 3 || rest & 3 || page + z > buffer->page_count))
+ return -EFAULT;
+
+ for (i = 0; i < z; i++) {
+ d = context_get_descriptors(&ctx->context, 1, &d_bus);
+ if (d == NULL)
+ return -ENOMEM;
+
+ d->control = cpu_to_le16(DESCRIPTOR_INPUT_MORE |
+ DESCRIPTOR_BRANCH_ALWAYS);
+ if (packet->skip && i == 0)
+ d->control |= cpu_to_le16(DESCRIPTOR_WAIT);
+ if (packet->interrupt && i == z - 1)
+ d->control |= cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS);
+
+ if (offset + rest < PAGE_SIZE)
+ length = rest;
+ else
+ length = PAGE_SIZE - offset;
+ d->req_count = cpu_to_le16(length);
+ d->res_count = d->req_count;
+ d->transfer_status = 0;
+
+ page_bus = page_private(buffer->pages[page]);
+ d->data_address = cpu_to_le32(page_bus + offset);
+
+ rest -= length;
+ offset = 0;
+ page++;
+
+ context_append(&ctx->context, d, 1, 0);
+ }
+
+ return 0;
+}
+
static int ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
@@ -2582,14 +2753,20 @@ static int ohci_queue_iso(struct fw_iso_context *base,
{
struct iso_context *ctx = container_of(base, struct iso_context, base);
unsigned long flags;
- int ret;
+ int ret = -ENOSYS;
spin_lock_irqsave(&ctx->context.ohci->lock, flags);
- if (base->type == FW_ISO_CONTEXT_TRANSMIT)
- ret = ohci_queue_iso_transmit(base, packet, buffer, payload);
- else
- ret = ohci_queue_iso_receive_packet_per_buffer(base, packet,
- buffer, payload);
+ switch (base->type) {
+ case FW_ISO_CONTEXT_TRANSMIT:
+ ret = queue_iso_transmit(ctx, packet, buffer, payload);
+ break;
+ case FW_ISO_CONTEXT_RECEIVE:
+ ret = queue_iso_packet_per_buffer(ctx, packet, buffer, payload);
+ break;
+ case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL:
+ ret = queue_iso_buffer_fill(ctx, packet, buffer, payload);
+ break;
+ }
spin_unlock_irqrestore(&ctx->context.ohci->lock, flags);
return ret;
@@ -2609,6 +2786,7 @@ static const struct fw_card_driver ohci_driver = {
.allocate_iso_context = ohci_allocate_iso_context,
.free_iso_context = ohci_free_iso_context,
+ .set_iso_channels = ohci_set_iso_channels,
.queue_iso = ohci_queue_iso,
.start_iso = ohci_start_iso,
.stop_iso = ohci_stop_iso,
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