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firewire: Implement basic isochronous receive functionality. 

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-02-16 17:34:40 -05:00 committed by Stefan Richter
parent 30200739e6
commit 295e3feb92
6 changed files with 181 additions and 30 deletions
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23
drivers/firewire/fw-device-cdev.c
View File

@ -406,8 +406,12 @@ static int ioctl_create_iso_context(struct client *client, void __user *arg)
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
if (request.type > FW_ISO_CONTEXT_RECEIVE)
return -EINVAL;
client->iso_context = fw_iso_context_create(client->device->card,
FW_ISO_CONTEXT_TRANSMIT,
request.type,
request.header_size,
iso_callback, client);
if (IS_ERR(client->iso_context))
return PTR_ERR(client->iso_context);
@ -419,7 +423,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
{
struct fw_cdev_queue_iso request;
struct fw_cdev_iso_packet __user *p, *end, *next;
unsigned long payload, payload_end;
unsigned long payload, payload_end, header_length;
int count;
struct {
struct fw_iso_packet packet;
@ -456,12 +460,23 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
while (p < end) {
if (__copy_from_user(&u.packet, p, sizeof *p))
return -EFAULT;
if (client->iso_context->type == FW_ISO_CONTEXT_TRANSMIT) {
header_length = u.packet.header_length;
} else {
/* We require that header_length is a multiple of
* the fixed header size, ctx->header_size */
if (u.packet.header_length % client->iso_context->header_size != 0)
return -EINVAL;
header_length = 0;
}
next = (struct fw_cdev_iso_packet __user *)
&p->header[u.packet.header_length / 4];
&p->header[header_length / 4];
if (next > end)
return -EINVAL;
if (__copy_from_user
(u.packet.header, p->header, u.packet.header_length))
(u.packet.header, p->header, header_length))
return -EFAULT;
if (u.packet.skip &&
u.packet.header_length + u.packet.payload_length > 0)

5
drivers/firewire/fw-device-cdev.h
View File

@ -125,7 +125,12 @@ struct fw_cdev_allocate {
__u32 length;
};
#define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
#define FW_CDEV_ISO_CONTEXT_RECEIVE 1
struct fw_cdev_create_iso_context {
__u32 type;
__u32 header_size;
__u32 handle;
};

7
drivers/firewire/fw-iso.c
View File

@ -105,9 +105,9 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
buffer->pages = NULL;
}
struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
fw_iso_callback_t callback,
void *callback_data)
struct fw_iso_context *
fw_iso_context_create(struct fw_card *card, int type, size_t header_size,
fw_iso_callback_t callback, void *callback_data)
{
struct fw_iso_context *ctx;
@ -117,6 +117,7 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
ctx->card = card;
ctx->type = type;
ctx->header_size = header_size;
ctx->callback = callback;
ctx->callback_data = callback_data;

168
drivers/firewire/fw-ohci.c
View File

@ -45,6 +45,7 @@
#define descriptor_irq_error (1 << 4)
#define descriptor_irq_always (3 << 4)
#define descriptor_branch_always (3 << 2)
#define descriptor_wait (3 << 0)
struct descriptor {
__le16 req_count;
@ -55,6 +56,20 @@ struct descriptor {
__le16 transfer_status;
} __attribute__((aligned(16)));
struct db_descriptor {
__le16 first_size;
__le16 control;
__le16 second_req_count;
__le16 first_req_count;
__le32 branch_address;
__le16 second_res_count;
__le16 first_res_count;
__le32 reserved0;
__le32 first_buffer;
__le32 second_buffer;
__le32 reserved1;
} __attribute__((aligned(16)));
#define control_set(regs) (regs)
#define control_clear(regs) ((regs) + 4)
#define command_ptr(regs) ((regs) + 12)
@ -171,7 +186,12 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
return container_of(card, struct fw_ohci, card);
}
#define CONTEXT_CYCLE_MATCH_ENABLE 0x80000000
#define IT_CONTEXT_CYCLE_MATCH_ENABLE 0x80000000
#define IR_CONTEXT_BUFFER_FILL 0x80000000
#define IR_CONTEXT_ISOCH_HEADER 0x40000000
#define IR_CONTEXT_CYCLE_MATCH_ENABLE 0x20000000
#define IR_CONTEXT_MULTI_CHANNEL_MODE 0x10000000
#define IR_CONTEXT_DUAL_BUFFER_MODE 0x08000000
#define CONTEXT_RUN 0x8000
#define CONTEXT_WAKE 0x1000
@ -518,14 +538,14 @@ context_get_descriptors(struct context *ctx, int z, dma_addr_t *d_bus)
return d;
}
static void context_run(struct context *ctx, u32 cycle_match)
static void context_run(struct context *ctx, u32 extra)
{
struct fw_ohci *ohci = ctx->ohci;
reg_write(ohci, command_ptr(ctx->regs),
le32_to_cpu(ctx->tail_descriptor_last->branch_address));
reg_write(ohci, control_clear(ctx->regs), ~0);
reg_write(ohci, control_set(ctx->regs), CONTEXT_RUN | cycle_match);
reg_write(ohci, control_set(ctx->regs), CONTEXT_RUN | extra);
flush_writes(ohci);
}
@ -1240,11 +1260,25 @@ ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
return retval;
}
static void ir_context_tasklet(unsigned long data)
static int handle_ir_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
{
struct iso_context *ctx = (struct iso_context *)data;
struct iso_context *ctx =
container_of(context, struct iso_context, context);
struct db_descriptor *db = (struct db_descriptor *) d;
if (db->first_res_count > 0 && db->second_res_count > 0)
/* This descriptor isn't done yet, stop iteration. */
return 0;
(void)ctx;
if (le16_to_cpu(db->control) & descriptor_irq_always)
/* FIXME: we should pass payload address here. */
ctx->base.callback(&ctx->base,
0, 0,
ctx->base.callback_data);
return 1;
}
#define ISO_BUFFER_SIZE (64 * 1024)
@ -1274,7 +1308,7 @@ ohci_allocate_iso_context(struct fw_card *card, int type)
struct fw_ohci *ohci = fw_ohci(card);
struct iso_context *ctx, *list;
descriptor_callback_t callback;
u32 *mask;
u32 *mask, regs;
unsigned long flags;
int index, retval;
@ -1283,7 +1317,9 @@ ohci_allocate_iso_context(struct fw_card *card, int type)
list = ohci->it_context_list;
callback = handle_it_packet;
} else {
return ERR_PTR(-EINVAL);
mask = &ohci->ir_context_mask;
list = ohci->ir_context_list;
callback = handle_ir_packet;
}
spin_lock_irqsave(&ohci->lock, flags);
@ -1295,10 +1331,15 @@ ohci_allocate_iso_context(struct fw_card *card, int type)
if (index < 0)
return ERR_PTR(-EBUSY);
if (type == FW_ISO_CONTEXT_TRANSMIT)
regs = OHCI1394_IsoXmitContextBase(index);
else
regs = OHCI1394_IsoRcvContextBase(index);
ctx = &list[index];
memset(ctx, 0, sizeof *ctx);
retval = context_init(&ctx->context, ohci, ISO_BUFFER_SIZE,
OHCI1394_IsoXmitContextBase(index), callback);
regs, callback);
if (retval < 0) {
spin_lock_irqsave(&ohci->lock, flags);
*mask |= 1 << index;
@ -1316,13 +1357,24 @@ static int ohci_send_iso(struct fw_iso_context *base, s32 cycle)
u32 cycle_match = 0;
int index;
index = ctx - ohci->it_context_list;
if (cycle > 0)
cycle_match = CONTEXT_CYCLE_MATCH_ENABLE |
(cycle & 0x7fff) << 16;
if (ctx->base.type == FW_ISO_CONTEXT_TRANSMIT) {
index = ctx - ohci->it_context_list;
if (cycle > 0)
cycle_match = IT_CONTEXT_CYCLE_MATCH_ENABLE |
(cycle & 0x7fff) << 16;
reg_write(ohci, OHCI1394_IsoXmitIntEventClear, 1 << index);
reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
context_run(&ctx->context, cycle_match);
} else {
index = ctx - ohci->ir_context_list;
reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1 << index);
context_run(&ctx->context, cycle_match);
reg_write(ohci, OHCI1394_IsoRecvIntEventClear, 1 << index);
reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1 << index);
reg_write(ohci, context_match(ctx->context.regs),
0xf0000000 | ctx->base.channel);
context_run(&ctx->context, IR_CONTEXT_DUAL_BUFFER_MODE);
}
return 0;
}
@ -1355,10 +1407,10 @@ static void ohci_free_iso_context(struct fw_iso_context *base)
}
static int
ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
ohci_queue_iso_transmit(struct fw_iso_context *base,
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;
@ -1451,6 +1503,84 @@ ohci_queue_iso(struct fw_iso_context *base,
return 0;
}
static int
ohci_queue_iso_receive(struct fw_iso_context *base,
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 db_descriptor *db = NULL;
struct descriptor *d;
struct fw_iso_packet *p;
dma_addr_t d_bus, page_bus;
u32 z, header_z, length, rest;
int page, offset;
/* FIXME: Cycle lost behavior should be configurable: lose
* packet, retransmit or terminate.. */
p = packet;
z = 2;
/* Get header size in number of descriptors. */
header_z = DIV_ROUND_UP(p->header_length, sizeof *d);
page = payload >> PAGE_SHIFT;
offset = payload & ~PAGE_MASK;
rest = p->payload_length;
/* FIXME: OHCI 1.0 doesn't support dual buffer receive */
/* FIXME: handle descriptor_wait */
/* FIXME: make packet-per-buffer/dual-buffer a context option */
while (rest > 0) {
d = context_get_descriptors(&ctx->context,
z + header_z, &d_bus);
if (d == NULL)
return -ENOMEM;
db = (struct db_descriptor *) d;
db->control = cpu_to_le16(descriptor_status |
descriptor_branch_always);
db->first_size = cpu_to_le16(ctx->base.header_size);
db->first_req_count = cpu_to_le16(p->header_length);
db->second_req_count = cpu_to_le16(p->payload_length);
db->first_res_count = cpu_to_le16(db->first_req_count);
db->second_res_count = cpu_to_le16(db->second_req_count);
db->first_buffer = cpu_to_le32(d_bus + sizeof *db);
if (offset + rest < PAGE_SIZE)
length = rest;
else
length = PAGE_SIZE - offset;
page_bus = page_private(buffer->pages[page]);
db->second_buffer = cpu_to_le32(page_bus + offset);
context_append(&ctx->context, d, z, header_z);
offset = (offset + length) & ~PAGE_MASK;
rest -= length;
page++;
}
if (p->interrupt)
db->control |= cpu_to_le16(descriptor_irq_always);
return 0;
}
static int
ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
if (base->type == FW_ISO_CONTEXT_TRANSMIT)
return ohci_queue_iso_transmit(base, packet, buffer, payload);
else
return ohci_queue_iso_receive(base, packet, buffer, payload);
}
static const struct fw_card_driver ohci_driver = {
.name = ohci_driver_name,
.enable = ohci_enable,

1
drivers/firewire/fw-ohci.h
View File

@ -103,6 +103,7 @@
#define OHCI1394_IsoXmitCommandPtr(n) (0x20C + 16 * (n))
/* Isochronous receive registers */
#define OHCI1394_IsoRcvContextBase(n) (0x400 + 32 * (n))
#define OHCI1394_IsoRcvContextControlSet(n) (0x400 + 32 * (n))
#define OHCI1394_IsoRcvContextControlClear(n) (0x404 + 32 * (n))
#define OHCI1394_IsoRcvCommandPtr(n) (0x40C + 32 * (n))

7
drivers/firewire/fw-transaction.h
View File

@ -354,6 +354,7 @@ struct fw_iso_context {
int type;
int channel;
int speed;
size_t header_size;
fw_iso_callback_t callback;
void *callback_data;
};
@ -369,10 +370,8 @@ void
fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
struct fw_iso_context *
fw_iso_context_create(struct fw_card *card, int type,
fw_iso_callback_t callback,
void *callback_data);
fw_iso_context_create(struct fw_card *card, int type, size_t header_size,
fw_iso_callback_t callback, void *callback_data);
void
fw_iso_context_destroy(struct fw_iso_context *ctx);