This series converts to use driver model for PCI/USB/ETH on Intel Galileo board.
Note this series depend on Simon's patch [1] below, which fixes the issue that pci enumeration is not automatically triggered when using pci config read/write apis.
Boot time performance degradation is observed with the conversion to use dm pci. Intel Quark SoC has a low end x86 processor with only 400MHz frequency and the most time consuming part is with MRC. Each MRC register programming requires indirect access via pci bus. With dm pci, accessing pci configuration space has some overhead. Unfortunately this single access overhead gets accumulated in the whole MRC process, and finally leads to twice boot time (25s) than before (12s).
To speed up the boot, create an optimized version of pci config read/write routines without bothering to go through driver model. Now it only takes about 3 seconds to finish MRC, which is really fast (8 times faster than dm pci, or 4 times faster than before).
[1]: http://patchwork.ozlabs.org/patch/509736/
Bin Meng (8): x86: quark: Make host bridge (b.d.f=0.0.0) visible dm: pci: Allow skipping device configuration x86: Convert to use driver model pci on quark/galileo x86: galileo: Convert to use CONFIG_DM_USB net: designware: Fix build warnings net: designware: Add support to PCI designware devices x86: Convert to use driver model eth on quark/galileo x86: quark: Optimize MRC execution time
arch/x86/cpu/quark/msg_port.c | 59 +++++++++++++++++++++++++++---------------- arch/x86/cpu/quark/pci.c | 46 +-------------------------------- arch/x86/cpu/quark/quark.c | 27 +++----------------- arch/x86/dts/galileo.dts | 8 ++++-- configs/galileo_defconfig | 5 +++- drivers/net/designware.c | 47 +++++++++++++++++++++++++++++++--- drivers/pci/pci-uclass.c | 3 +++ include/configs/galileo.h | 12 --------- 8 files changed, 98 insertions(+), 109 deletions(-)