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| author |   Stephen Chivers <schivers@csc.com> | 2014-04-20 09:43:10 +1000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-04-28 17:36:25 +1000 |
| commit | 13ae40370f62cd73f90aca34feb44bac83f41075 (patch) | |
| tree | 207e035d047b2101dde5c0a9ea7ecfbcc44de6dc /arch/powerpc/platforms/embedded6xx | |
| parent | powerpc/boot: Add support for 64bit little endian wrapper (diff) | |
| download | linux-dev-13ae40370f62cd73f90aca34feb44bac83f41075.tar.xz linux-dev-13ae40370f62cd73f90aca34feb44bac83f41075.zip | |
powerpc/legacy_serial: Support MVME5100 UARTS with shifted registers
This patch adds support to legacy serial for
UARTS with shifted registers.
The MVME5100 Single Board Computer is a PowerPC platform
that has 16550 style UARTS with register addresses that are
16 bytes apart (shifted by 4).
Commit 309257484cc1a592e8ac5fbdd8cd661be2b80bf8
"powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTs"
added support to udbg_16550 for shifted registers by adding a "stride"
parameter to the initialisation operations for Programmed IO and
Memory Mapped IO.
As a consequence it is now possible to use the services of legacy serial
to provide early serial console messages for the MVME5100.
An added benefit of this is that the serial console will always be
"ttyS0" irrespective of whether the computer is fitted with extra
PCI 8250 interface boards or not.
I have tested this patch using the four PowerPC platforms available to me:
MVME5100 - shifted registers,
SAM440EP - unshifted registers,
MPC8349 - unshifted registers,
MVME4100 - unshifted registers.
Signed-off-by: Stephen Chivers <schivers@csc.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/embedded6xx')
| -rw-r--r-- | arch/powerpc/platforms/embedded6xx/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/embedded6xx/Kconfig b/arch/powerpc/platforms/embedded6xx/Kconfig index 2a7024d8d8b1..a25f496c2ef9 100644 --- a/arch/powerpc/platforms/embedded6xx/Kconfig +++ b/arch/powerpc/platforms/embedded6xx/Kconfig @@ -65,6 +65,7 @@ config MVME5100 select PPC_INDIRECT_PCI select PPC_I8259 select PPC_NATIVE + select PPC_UDBG_16550 help This option enables support for the Motorola (now Emerson) MVME5100 board. |