firewire: add CSR BUSY_TIMEOUT support
Implement the BUSY_TIMEOUT register, which is required for nodes that
support retries.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 3d4badb..9c588fd 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1731,7 +1731,8 @@
reg_write(ohci, OHCI1394_ATRetries,
OHCI1394_MAX_AT_REQ_RETRIES |
(OHCI1394_MAX_AT_RESP_RETRIES << 4) |
- (OHCI1394_MAX_PHYS_RESP_RETRIES << 8));
+ (OHCI1394_MAX_PHYS_RESP_RETRIES << 8) |
+ (200 << 16));
seconds = lower_32_bits(get_seconds());
reg_write(ohci, OHCI1394_IsochronousCycleTimer, seconds << 25);
@@ -2023,6 +2024,10 @@
spin_unlock_irqrestore(&ohci->lock, flags);
return value;
+ case CSR_BUSY_TIMEOUT:
+ value = reg_read(ohci, OHCI1394_ATRetries);
+ return (value >> 4) & 0x0ffff00f;
+
default:
WARN_ON(1);
return 0;
@@ -2053,6 +2058,13 @@
spin_unlock_irqrestore(&ohci->lock, flags);
break;
+ case CSR_BUSY_TIMEOUT:
+ value = (value & 0xf) | ((value & 0xf) << 4) |
+ ((value & 0xf) << 8) | ((value & 0x0ffff000) << 4);
+ reg_write(ohci, OHCI1394_ATRetries, value);
+ flush_writes(ohci);
+ break;
+
default:
WARN_ON(1);
break;