On 25/03/15 22:03, Greg Kroah-Hartman wrote: > On Wed, Mar 25, 2015 at 03:39:50PM +0000, James Hogan wrote: >> Add MIPS Common Device Memory Map (CDMM) support in the form of a bus in >> the standard Linux device model. Each device attached via CDMM is >> discoverable via an 8-bit type identifier and may contain a number of >> blocks of memory mapped registers in the CDMM region. IRQs are expected >> to be handled separately. >> >> Due to the per-cpu (per-VPE for MT cores) nature of the CDMM devices, >> all the driver callbacks take place from workqueues which are run on the >> right CPU for the device in question, so that the driver doesn't need to >> be as concerned about which CPU it is running on. Callbacks also exist >> for when CPUs are taken offline, so that any per-CPU resources used by >> the driver can be disabled so they don't get forcefully migrated. CDMM >> devices are created as children of the CPU device they are attached to. >> >> Any existing CDMM configuration by the bootloader will be inherited, >> however platforms wishing to enable CDMM should implement the weak >> mips_cdmm_phys_base() function (see asm/cdmm.h) so that the bus driver >> knows where it should put the CDMM region in the physical address space >> if the bootloader hasn't already enabled it. >> >> A mips_cdmm_early_probe() function is also provided to allow early boot >> or particularly low level code to set up the CDMM region and probe for a >> specific device type, for example early console or KGDB IO drivers for >> the EJTAG Fast Debug Channel (FDC) CDMM device. >> >> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> >> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> >> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> >> Cc: linux-mips@xxxxxxxxxxxxxx >> --- >> Changes in v3: >> - Convert to use dev_groups rather than dev_attrs (GregKH). >> - Rename mips_cdmm_attr_func() macro to CDMM_ATTR for consistency with >> other similar macro names I've seen around the kernel. >> - Add modalias attribute. >> >> Changes in v2: >> - Fix some checkpatch errors. >> - Correct CDMM name in various places. It is "Common Device Memory Map", >> rather than "Common Device Mapped Memory" (which for some reason had >> got stuck in my head). >> --- >> arch/mips/include/asm/cdmm.h | 87 +++++ >> drivers/bus/Kconfig | 13 + >> drivers/bus/Makefile | 1 + >> drivers/bus/mips_cdmm.c | 716 ++++++++++++++++++++++++++++++++++++++ >> include/linux/mod_devicetable.h | 8 + >> scripts/mod/devicetable-offsets.c | 3 + >> scripts/mod/file2alias.c | 16 + >> 7 files changed, 844 insertions(+) >> create mode 100644 arch/mips/include/asm/cdmm.h >> create mode 100644 drivers/bus/mips_cdmm.c > > Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Thanks Greg! Cheers James
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