linux/include
Esben Haabendal f14f5c11f0 net: ll_temac: Support indirect_mutex share within TEMAC IP
Indirect register access goes through a DCR bus bridge, which
allows only one outstanding transaction.  And to make matters
worse, each TEMAC IP block contains two Ethernet interfaces, and
although they seem to have separate registers for indirect access,
they actually share the registers.  Or to be more specific, MSW, LSW
and CTL registers are physically shared between Ethernet interfaces
in same TEMAC IP, with RDY register being (almost) specificic to
the Ethernet interface.  The 0x10000 bit in RDY reflects combined
bus ready state though.

So we need to take care to synchronize not only within a single
device, but also between devices in same TEMAC IP.

This commit allows to do that with legacy platform devices.

For OF devices, the xlnx,compound parent of the temac node should be
used to find siblings, and setup a shared indirect_mutex between them.
I will leave this work to somebody else, as I don't have hardware to
test that.  No regression is introduced by that, as before this commit
using two Ethernet interfaces in same TEMAC block is simply broken.

Signed-off-by: Esben Haabendal <esben@geanix.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-01 14:33:30 -04:00
..
acpi ACPI: use different default debug value than ACPICA 2019-03-25 10:45:59 +01:00
asm-generic syscalls: Remove start and number from syscall_set_arguments() args 2019-04-05 09:27:23 -04:00
clocksource clocksource/arm_arch_timer: Store physical timer IRQ number for KVM on VHE 2019-02-19 21:05:22 +00:00
crypto crypto: export arc4 defines 2019-02-15 13:21:55 +08:00
drm drm/atomic-helper: Make atomic_enable/disable crtc callbacks optional 2019-03-29 11:56:52 +01:00
dt-bindings dt-bindings: clock: sifive: add FU540-C000 PRCI clock constants 2019-04-09 20:36:40 -07:00
keys KEYS: trusted: fix -Wvarags warning 2019-04-08 15:58:54 -07:00
kvm ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
linux net: ll_temac: Support indirect_mutex share within TEMAC IP 2019-05-01 14:33:30 -04:00
math-emu
media media: include: fix several typos 2019-03-01 09:45:52 -05:00
memory
misc auxdisplay: charlcd: Introduce charlcd_free() helper 2019-03-17 08:48:16 +01:00
net devlink: Change devlink health locking mechanism 2019-05-01 11:07:03 -04:00
pcmcia
ras
rdma RDMA: Handle ucontext allocations by IB/core 2019-02-22 14:11:37 -07:00
scsi scsi: kill command serial number 2019-02-27 09:19:24 -05:00
soc IOMMU Updates for Linux v5.1 2019-03-10 12:29:52 -07:00
sound ASoC: core: conditionally increase module refcount on component open 2019-04-08 14:15:44 +07:00
target
trace selftests: bpf: test writable buffers in raw tps 2019-04-26 19:04:19 -07:00
uapi taprio: Add support for cycle-time-extension 2019-05-01 11:58:51 -04:00
video media updates for v5.1-rc1 2019-03-09 14:45:54 -08:00
xen x86/xen: dont add memory above max allowed allocation 2019-02-18 06:52:51 +01:00