Commit 023b13a5 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Michael Ellerman

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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent b3c711a9
...@@ -233,7 +233,8 @@ static int __init add_legacy_isa_port(struct device_node *np, ...@@ -233,7 +233,8 @@ static int __init add_legacy_isa_port(struct device_node *np,
* *
* Note: Don't even try on P8 lpc, we know it's not directly mapped * Note: Don't even try on P8 lpc, we know it's not directly mapped
*/ */
if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc")) { if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
of_get_property(isa_brg, "ranges", NULL)) {
taddr = of_translate_address(np, reg); taddr = of_translate_address(np, reg);
if (taddr == OF_BAD_ADDR) if (taddr == OF_BAD_ADDR)
taddr = 0; taddr = 0;
......
...@@ -407,9 +407,17 @@ void opal_lpc_init(void) ...@@ -407,9 +407,17 @@ void opal_lpc_init(void)
if (opal_lpc_chip_id < 0) if (opal_lpc_chip_id < 0)
return; return;
/* 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 */ /* Setup special IO ops */
ppc_pci_io = opal_lpc_io; ppc_pci_io = opal_lpc_io;
isa_io_special = true; isa_io_special = true;
}
pr_info("OPAL: Power8 LPC bus found, chip ID %d\n", opal_lpc_chip_id);
} }
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