net: stmmac: prepare dma operations for multiple queues

As agreed with David Miller, this patch-set is the second of 3 to enable multiple queues in stmmac.

This second one concentrates on dma operations adding functionalities as:
a) DMA Operation Mode configuration per channel and done in the multiple queues configuration function
b) DMA IRQ enable and Disable by channel
c) DMA start and stop by channel
d) RX and TX ring length configuration by channel
e) RX and TX set tail pointer by channel
f) DMA Channel initialization broke into Channel comon, RX and TX initialization
g) TSO being configured for all available channels
h) DMA interrupt treatment by channel

Joao Pinto (11):
net: stmmac: prepare dma op mode config for multiple queues
net: stmmac: enable/disable dma irq prepared for multiple queues
net: stmmac: rx/tx dma start/stop prepared for multiple queues
net: stmmac: prepare stmmac_tx_err for multiple queues
net: stmmac: prepare dma interrupt treatment for multiple queues
net: stmmac: rx watchdog config prepared for multiple queues
net: stmmac: rx and tx ring length prepared for multiple queues
net: stmmac: prepare rx/tx set tail function for multiple queues
net: stmmac: dma channel init prepared for multiple queues
net: stmmac: tso init prepared for multiple queues
net: stmmac: stmmac interrupt treatment prepared for multiple queues

 drivers/net/ethernet/stmicro/stmmac/common.h       |  31 +-
 .../net/ethernet/stmicro/stmmac/dwmac1000_dma.c    |   3 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c   | 192 ++++++-----
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h   |  20 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c   |  56 ++--
 drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h    |  15 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c    |  14 +-
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |   3 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 367 ++++++++++++++++-----
 9 files changed, 465 insertions(+), 236 deletions(-)

2.9.3