[Qemu-devel] [RFC PATCH 00/11] Clock framework API.

[fred.konrad@greensocs.com]

From: KONRAD Frederic <fred.konrad@greensocs.com>

Hi,

This is a first draft of the clock framework API it contains:

  * The first 5 patches which introduce the framework.
  * The 6th patch which introduces a fixed-clock model.
  * The rest which gives an example how to model a PLL from the existing
    zynqmp-crf extracted from the qemu xilinx tree.

No specific behavior is expected yet when the CRF register set is accessed but
the user can see for example the dp_video_ref and vpll_to_lpd rate changing in
the monitor with the "info qtree" command when the vpll_ctrl register is
modified.

bus: main-system-bus
  type System
  dev: xlnx.zynqmp_crf, id ""
    gpio-out "sysbus-irq" 1
    gpio-out "RST_A9" 4
    qemu-clk "dbg_trace" 0.0
    qemu-clk "vpll_to_lpd" 12500000.0
    qemu-clk "dp_stc_ref" 0.0
    qemu-clk "dpll_to_lpd" 12500000.0
    qemu-clk "acpu_clk" 0.0
    qemu-clk "pcie_ref" 0.0
    qemu-clk "topsw_main" 0.0
    qemu-clk "topsw_lsbus" 0.0
    qemu-clk "dp_audio_ref" 0.0
    qemu-clk "sata_ref" 0.0
    qemu-clk "dp_video_ref" 1428571.4
    qemu-clk "vpll_clk" 50000000.0
    qemu-clk "apll_to_lpd" 12500000.0
    qemu-clk "dpll_clk" 50000000.0
    qemu-clk "gpu_ref" 0.0
    qemu-clk "aux_refclk" 0.0
    qemu-clk "video_clk" 27000000.0
    qemu-clk "gdma_ref" 0.0
    qemu-clk "gt_crx_ref_clk" 0.0
    qemu-clk "dbg_fdp" 0.0
    qemu-clk "apll_clk" 50000000.0
    qemu-clk "pss_alt_ref_clk" 0.0
    qemu-clk "ddr" 0.0
    qemu-clk "pss_ref_clk" 50000000.0
    qemu-clk "dpdma_ref" 0.0
    qemu-clk "dbg_tstmp" 0.0
    mmio 00000000fd1a0000/000000000000010c
    
This series is based on the current master
(d6550e9ed2e1a60d889dfb721de00d9a4e3bafbe) with the data-driven register
patch-set from Alistair.

Note that the omap clock infrastructure is really far from what we need so I
think it's worse implement the clock framework and then rework the omaps
platforms to use it.

TODO:
  * reshape the omap clock tree to use this one.

Any comment on that?

Thanks,
Fred

KONRAD Frederic (11):
  qemu-clk: introduce qemu-clk qom object
  qemu-clk: allow to attach a clock to a device
  qemu-clk: allow to bound two clocks together
  qdev-monitor: print the device's clock with info qtree
  docs: add qemu-clock documentation
  introduce fixed-clock
  introduce zynqmp_crf
  zynqmp_crf: fix against AF_EX32 changes
  zynqmp_crf: add the clock mechanism
  zynqmp: add the zynqmp_crf to the platform
  zynqmp: add reference clock

 Makefile.objs                 |   1 +
 docs/clock.txt                | 112 +++++
 hw/arm/xlnx-zynqmp.c          |  49 +++
 hw/misc/Makefile.objs         |   3 +
 hw/misc/fixed-clock.c         |  87 ++++
 hw/misc/xilinx_zynqmp_crf.c   | 972 ++++++++++++++++++++++++++++++++++++++++++
 include/hw/arm/xlnx-zynqmp.h  |   7 +
 include/hw/misc/fixed-clock.h |  30 ++
 include/qemu/qemu-clock.h     | 136 ++++++
 qdev-monitor.c                |   2 +
 qemu-clock.c                  | 153 +++++++
 11 files changed, 1552 insertions(+)
 create mode 100644 docs/clock.txt
 create mode 100644 hw/misc/fixed-clock.c
 create mode 100644 hw/misc/xilinx_zynqmp_crf.c
 create mode 100644 include/hw/misc/fixed-clock.h
 create mode 100644 include/qemu/qemu-clock.h
 create mode 100644 qemu-clock.c

-- 
2.5.5