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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-01-30 18:11:57 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-01-31 13:54:18 +1100 |
| commit | 023b13a50183d9cfc4fc5a66cb1f773ace22024c (patch) | |
| tree | ad6ca1d8c83e0b750f452f7f947a3375f2a19fae /arch/powerpc/platforms | |
| parent | b3c711a9e19eb2b300132f1712ff3d5afb4b02dc (diff) | |
| download | op-kernel-dev-023b13a50183d9cfc4fc5a66cb1f773ace22024c.zip op-kernel-dev-023b13a50183d9cfc4fc5a66cb1f773ace22024c.tar.gz | |
powerpc/powernv: Add support for direct mapped LPC on POWER9
Use the new non-PCI ISA bridge support to expose the POWER9
LPC bus as direct mapped via the ISA IO port range. This
enables direct access via drivers such as 8250
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-lpc.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-lpc.c b/arch/powerpc/platforms/powernv/opal-lpc.c index 2048ce7..1a8cd54 100644 --- a/arch/powerpc/platforms/powernv/opal-lpc.c +++ b/arch/powerpc/platforms/powernv/opal-lpc.c @@ -407,9 +407,17 @@ void opal_lpc_init(void) if (opal_lpc_chip_id < 0) return; - /* Setup special IO ops */ - ppc_pci_io = opal_lpc_io; - isa_io_special = true; - - pr_info("OPAL: Power8 LPC bus found, chip ID %d\n", opal_lpc_chip_id); + /* Does it support direct mapping ? */ + if (of_get_property(np, "ranges", NULL)) { + pr_info("OPAL: Found memory mapped LPC bus on chip %d\n", + opal_lpc_chip_id); + isa_bridge_init_non_pci(np); + } else { + pr_info("OPAL: Found non-mapped LPC bus on chip %d\n", + opal_lpc_chip_id); + + /* Setup special IO ops */ + ppc_pci_io = opal_lpc_io; + isa_io_special = true; + } } |
