LDC changes for porting VCC driver into upstream kernel

Version 2 of patch-set to enable LDC to support VCC driver. Version 2 addresses the following changes suggested by Dave Miller
Patch 1/5: enable_irq()/disable_irq() used to enable/disable HV interrupts Patch 4/5: Commit message adds more detail to justify the change

Jag Raman (5):
sparc64: expand LDC interface
sparc64: enhance ldc_abort to print message
sparc64: ensure LDC channel is ready before communication
sparc64: ldc abort during vds iso boot
sparc64: print debug messages when reading from LDC channel

 arch/sparc/include/asm/ldc.h |   10 +++
 arch/sparc/kernel/ldc.c      |  176 +++++++++++++++++++++++++++++++----------
 2 files changed, 143 insertions(+), 43 deletions(-)