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>

3 files changed, 86 insertions, 3 deletions

diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index a9e13468f60c..6f9895d201b8 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -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;
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index 38b286ed744f..d36dd512a59d 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -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);
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index a661afb9d68f..855beb27216d 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -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);