firewire: Implement CSR cycle time and bus time registers.

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 2007-03-07 12:12:56 -05:00 committed by Stefan Richter
parent 473d28c730
commit d60d7f1d5c
3 changed files with 86 additions and 3 deletions

View File

@ -139,6 +139,7 @@ struct fw_ohci {
int node_id;
int generation;
int request_generation;
u32 bus_seconds;
/* Spinlock for accessing fw_ohci data. Never call out of
* this driver with this lock held. */
@ -959,7 +960,7 @@ static void bus_reset_tasklet(unsigned long data)
static irqreturn_t irq_handler(int irq, void *data)
{
struct fw_ohci *ohci = data;
u32 event, iso_event;
u32 event, iso_event, cycle_time;
int i;
event = reg_read(ohci, OHCI1394_IntEventClear);
@ -1002,6 +1003,12 @@ static irqreturn_t irq_handler(int irq, void *data)
iso_event &= ~(1 << i);
}
if (event & OHCI1394_cycle64Seconds) {
cycle_time = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
if ((cycle_time & 0x80000000) == 0)
ohci->bus_seconds++;
}
return IRQ_HANDLED;
}
@ -1213,6 +1220,19 @@ ohci_enable_phys_dma(struct fw_card *card, int node_id, int generation)
return retval;
}
static u64
ohci_get_bus_time(struct fw_card *card)
{
struct fw_ohci *ohci = fw_ohci(card);
u32 cycle_time;
u64 bus_time;
cycle_time = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
bus_time = ((u64) ohci->bus_seconds << 32) | cycle_time;
return bus_time;
}
static int handle_ir_bufferfill_packet(struct context *context,
struct descriptor *d,
struct descriptor *last)
@ -1686,6 +1706,7 @@ static const struct fw_card_driver ohci_driver = {
.send_response = ohci_send_response,
.cancel_packet = ohci_cancel_packet,
.enable_phys_dma = ohci_enable_phys_dma,
.get_bus_time = ohci_get_bus_time,
.allocate_iso_context = ohci_allocate_iso_context,
.free_iso_context = ohci_free_iso_context,
@ -1862,7 +1883,8 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
OHCI1394_RQPkt | OHCI1394_RSPkt |
OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
OHCI1394_isochRx | OHCI1394_isochTx |
OHCI1394_masterIntEnable);
OHCI1394_masterIntEnable |
OHCI1394_cycle64Seconds);
bus_options = reg_read(ohci, OHCI1394_BusOptions);
max_receive = (bus_options >> 12) & 0xf;

View File

@ -752,10 +752,65 @@ handle_topology_map(struct fw_card *card, struct fw_request *request,
}
static struct fw_address_handler topology_map = {
.length = 0x400,
.length = 0x200,
.address_callback = handle_topology_map,
};
const struct fw_address_region registers_region =
{ .start = 0xfffff0000000ull, .end = 0xfffff0000400ull, };
static void
handle_registers(struct fw_card *card, struct fw_request *request,
int tcode, int destination, int source,
int generation, int speed,
unsigned long long offset,
void *payload, size_t length, void *callback_data)
{
int reg = offset - CSR_REGISTER_BASE;
unsigned long long bus_time;
__be32 *data = payload;
switch (reg) {
case CSR_CYCLE_TIME:
case CSR_BUS_TIME:
if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
fw_send_response(card, request, RCODE_TYPE_ERROR);
break;
}
bus_time = card->driver->get_bus_time(card);
if (reg == CSR_CYCLE_TIME)
*data = cpu_to_be32(bus_time);
else
*data = cpu_to_be32(bus_time >> 25);
fw_send_response(card, request, RCODE_COMPLETE);
break;
case CSR_BUS_MANAGER_ID:
case CSR_BANDWIDTH_AVAILABLE:
case CSR_CHANNELS_AVAILABLE_HI:
case CSR_CHANNELS_AVAILABLE_LO:
/* FIXME: these are handled by the OHCI hardware and
* the stack never sees these request. If we add
* support for a new type of controller that doesn't
* handle this in hardware we need to deal with these
* transactions. */
BUG();
break;
case CSR_BUSY_TIMEOUT:
/* FIXME: Implement this. */
default:
fw_send_response(card, request, RCODE_ADDRESS_ERROR);
break;
}
}
static struct fw_address_handler registers = {
.length = 0x400,
.address_callback = handle_registers,
};
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
MODULE_LICENSE("GPL");
@ -811,6 +866,10 @@ static int __init fw_core_init(void)
&topology_map_region);
BUG_ON(retval < 0);
retval = fw_core_add_address_handler(&registers,
&registers_region);
BUG_ON(retval < 0);
/* Add the vendor textual descriptor. */
retval = fw_core_add_descriptor(&vendor_id_descriptor);
BUG_ON(retval < 0);

View File

@ -433,6 +433,8 @@ struct fw_card_driver {
int (*enable_phys_dma) (struct fw_card *card,
int node_id, int generation);
u64 (*get_bus_time) (struct fw_card *card);
struct fw_iso_context *
(*allocate_iso_context)(struct fw_card *card, int sync, int tags,
int type, size_t header_size);