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-rw-r--r--drivers/firewire/core-transaction.c14
-rw-r--r--drivers/firewire/ohci.c168
2 files changed, 120 insertions, 62 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index e3925f67ec12..2a390726fa76 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1104,6 +1104,17 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
rcode = RCODE_TYPE_ERROR;
break;
+ case CSR_BUS_TIME:
+ if (tcode == TCODE_READ_QUADLET_REQUEST)
+ *data = cpu_to_be32(card->driver->
+ read_csr_reg(card, CSR_BUS_TIME));
+ else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
+ card->driver->write_csr_reg(card, CSR_BUS_TIME,
+ be32_to_cpu(*data));
+ else
+ rcode = RCODE_TYPE_ERROR;
+ break;
+
case CSR_BROADCAST_CHANNEL:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = cpu_to_be32(card->broadcast_channel);
@@ -1132,9 +1143,6 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
case CSR_BUSY_TIMEOUT:
/* FIXME: Implement this. */
- case CSR_BUS_TIME:
- /* Useless without initialization by the bus manager. */
-
default:
rcode = RCODE_ADDRESS_ERROR;
break;
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 777811a736b2..3d4badb7c79b 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -170,6 +170,7 @@ struct fw_ohci {
int generation;
int request_generation; /* for timestamping incoming requests */
unsigned quirks;
+ u32 bus_time;
/*
* Spinlock for accessing fw_ohci data. Never call out of
@@ -292,7 +293,7 @@ static void log_irqs(u32 evt)
!(evt & OHCI1394_busReset))
return;
- fw_notify("IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt,
+ fw_notify("IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt,
evt & OHCI1394_selfIDComplete ? " selfID" : "",
evt & OHCI1394_RQPkt ? " AR_req" : "",
evt & OHCI1394_RSPkt ? " AR_resp" : "",
@@ -302,6 +303,7 @@ static void log_irqs(u32 evt)
evt & OHCI1394_isochTx ? " IT" : "",
evt & OHCI1394_postedWriteErr ? " postedWriteErr" : "",
evt & OHCI1394_cycleTooLong ? " cycleTooLong" : "",
+ evt & OHCI1394_cycle64Seconds ? " cycle64Seconds" : "",
evt & OHCI1394_cycleInconsistent ? " cycleInconsistent" : "",
evt & OHCI1394_regAccessFail ? " regAccessFail" : "",
evt & OHCI1394_busReset ? " busReset" : "",
@@ -309,7 +311,8 @@ static void log_irqs(u32 evt)
OHCI1394_RSPkt | OHCI1394_reqTxComplete |
OHCI1394_respTxComplete | OHCI1394_isochRx |
OHCI1394_isochTx | OHCI1394_postedWriteErr |
- OHCI1394_cycleTooLong | OHCI1394_cycleInconsistent |
+ OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
+ OHCI1394_cycleInconsistent |
OHCI1394_regAccessFail | OHCI1394_busReset)
? " ?" : "");
}
@@ -1316,6 +1319,78 @@ static void at_context_transmit(struct context *ctx, struct fw_packet *packet)
}
+static u32 cycle_timer_ticks(u32 cycle_timer)
+{
+ u32 ticks;
+
+ ticks = cycle_timer & 0xfff;
+ ticks += 3072 * ((cycle_timer >> 12) & 0x1fff);
+ ticks += (3072 * 8000) * (cycle_timer >> 25);
+
+ return ticks;
+}
+
+/*
+ * Some controllers exhibit one or more of the following bugs when updating the
+ * iso cycle timer register:
+ * - When the lowest six bits are wrapping around to zero, a read that happens
+ * at the same time will return garbage in the lowest ten bits.
+ * - When the cycleOffset field wraps around to zero, the cycleCount field is
+ * not incremented for about 60 ns.
+ * - Occasionally, the entire register reads zero.
+ *
+ * To catch these, we read the register three times and ensure that the
+ * difference between each two consecutive reads is approximately the same, i.e.
+ * less than twice the other. Furthermore, any negative difference indicates an
+ * error. (A PCI read should take at least 20 ticks of the 24.576 MHz timer to
+ * execute, so we have enough precision to compute the ratio of the differences.)
+ */
+static u32 get_cycle_time(struct fw_ohci *ohci)
+{
+ u32 c0, c1, c2;
+ u32 t0, t1, t2;
+ s32 diff01, diff12;
+ int i;
+
+ c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+
+ if (ohci->quirks & QUIRK_CYCLE_TIMER) {
+ i = 0;
+ c1 = c2;
+ c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+ do {
+ c0 = c1;
+ c1 = c2;
+ c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
+ t0 = cycle_timer_ticks(c0);
+ t1 = cycle_timer_ticks(c1);
+ t2 = cycle_timer_ticks(c2);
+ diff01 = t1 - t0;
+ diff12 = t2 - t1;
+ } while ((diff01 <= 0 || diff12 <= 0 ||
+ diff01 / diff12 >= 2 || diff12 / diff01 >= 2)
+ && i++ < 20);
+ }
+
+ return c2;
+}
+
+/*
+ * This function has to be called at least every 64 seconds. The bus_time
+ * field stores not only the upper 25 bits of the BUS_TIME register but also
+ * the most significant bit of the cycle timer in bit 6 so that we can detect
+ * changes in this bit.
+ */
+static u32 update_bus_time(struct fw_ohci *ohci)
+{
+ u32 cycle_time_seconds = get_cycle_time(ohci) >> 25;
+
+ if ((ohci->bus_time & 0x40) != (cycle_time_seconds & 0x40))
+ ohci->bus_time += 0x40;
+
+ return ohci->bus_time | cycle_time_seconds;
+}
+
static void bus_reset_tasklet(unsigned long data)
{
struct fw_ohci *ohci = (struct fw_ohci *)data;
@@ -1520,6 +1595,12 @@ static irqreturn_t irq_handler(int irq, void *data)
fw_notify("isochronous cycle inconsistent\n");
}
+ if (event & OHCI1394_cycle64Seconds) {
+ spin_lock(&ohci->lock);
+ update_bus_time(ohci);
+ spin_unlock(&ohci->lock);
+ }
+
return IRQ_HANDLED;
}
@@ -1604,7 +1685,7 @@ static int ohci_enable(struct fw_card *card,
{
struct fw_ohci *ohci = fw_ohci(card);
struct pci_dev *dev = to_pci_dev(card->device);
- u32 lps, irqs;
+ u32 lps, seconds, irqs;
int i, ret;
if (software_reset(ohci)) {
@@ -1652,6 +1733,10 @@ static int ohci_enable(struct fw_card *card,
(OHCI1394_MAX_AT_RESP_RETRIES << 4) |
(OHCI1394_MAX_PHYS_RESP_RETRIES << 8));
+ seconds = lower_32_bits(get_seconds());
+ reg_write(ohci, OHCI1394_IsochronousCycleTimer, seconds << 25);
+ ohci->bus_time = seconds & ~0x3f;
+
ar_context_run(&ohci->ar_request_ctx);
ar_context_run(&ohci->ar_response_ctx);
@@ -1732,6 +1817,7 @@ static int ohci_enable(struct fw_card *card,
OHCI1394_postedWriteErr |
OHCI1394_selfIDComplete |
OHCI1394_regAccessFail |
+ OHCI1394_cycle64Seconds |
OHCI1394_cycleInconsistent | OHCI1394_cycleTooLong |
OHCI1394_masterIntEnable;
if (param_debug & OHCI_PARAM_DEBUG_BUSRESETS)
@@ -1913,65 +1999,11 @@ static int ohci_enable_phys_dma(struct fw_card *card,
#endif /* CONFIG_FIREWIRE_OHCI_REMOTE_DMA */
}
-static u32 cycle_timer_ticks(u32 cycle_timer)
-{
- u32 ticks;
-
- ticks = cycle_timer & 0xfff;
- ticks += 3072 * ((cycle_timer >> 12) & 0x1fff);
- ticks += (3072 * 8000) * (cycle_timer >> 25);
-
- return ticks;
-}
-
-/*
- * Some controllers exhibit one or more of the following bugs when updating the
- * iso cycle timer register:
- * - When the lowest six bits are wrapping around to zero, a read that happens
- * at the same time will return garbage in the lowest ten bits.
- * - When the cycleOffset field wraps around to zero, the cycleCount field is
- * not incremented for about 60 ns.
- * - Occasionally, the entire register reads zero.
- *
- * To catch these, we read the register three times and ensure that the
- * difference between each two consecutive reads is approximately the same, i.e.
- * less than twice the other. Furthermore, any negative difference indicates an
- * error. (A PCI read should take at least 20 ticks of the 24.576 MHz timer to
- * execute, so we have enough precision to compute the ratio of the differences.)
- */
-static u32 get_cycle_time(struct fw_ohci *ohci)
-{
- u32 c0, c1, c2;
- u32 t0, t1, t2;
- s32 diff01, diff12;
- int i;
-
- c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
-
- if (ohci->quirks & QUIRK_CYCLE_TIMER) {
- i = 0;
- c1 = c2;
- c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
- do {
- c0 = c1;
- c1 = c2;
- c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
- t0 = cycle_timer_ticks(c0);
- t1 = cycle_timer_ticks(c1);
- t2 = cycle_timer_ticks(c2);
- diff01 = t1 - t0;
- diff12 = t2 - t1;
- } while ((diff01 <= 0 || diff12 <= 0 ||
- diff01 / diff12 >= 2 || diff12 / diff01 >= 2)
- && i++ < 20);
- }
-
- return c2;
-}
-
static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset)
{
struct fw_ohci *ohci = fw_ohci(card);
+ unsigned long flags;
+ u32 value;
switch (csr_offset) {
case CSR_NODE_IDS:
@@ -1980,6 +2012,17 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset)
case CSR_CYCLE_TIME:
return get_cycle_time(ohci);
+ case CSR_BUS_TIME:
+ /*
+ * We might be called just after the cycle timer has wrapped
+ * around but just before the cycle64Seconds handler, so we
+ * better check here, too, if the bus time needs to be updated.
+ */
+ spin_lock_irqsave(&ohci->lock, flags);
+ value = update_bus_time(ohci);
+ spin_unlock_irqrestore(&ohci->lock, flags);
+ return value;
+
default:
WARN_ON(1);
return 0;
@@ -1989,6 +2032,7 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset)
static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
{
struct fw_ohci *ohci = fw_ohci(card);
+ unsigned long flags;
switch (csr_offset) {
case CSR_NODE_IDS:
@@ -2003,6 +2047,12 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
flush_writes(ohci);
break;
+ case CSR_BUS_TIME:
+ spin_lock_irqsave(&ohci->lock, flags);
+ ohci->bus_time = (ohci->bus_time & 0x7f) | (value & ~0x7f);
+ spin_unlock_irqrestore(&ohci->lock, flags);
+ break;
+
default:
WARN_ON(1);
break;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 13:10:10 +0000