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>
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@ -233,7 +233,8 @@ static int __init add_legacy_isa_port(struct device_node *np,
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*
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* Note: Don't even try on P8 lpc, we know it's not directly mapped
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*/
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if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc")) {
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if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
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of_get_property(isa_brg, "ranges", NULL)) {
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taddr = of_translate_address(np, reg);
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if (taddr == OF_BAD_ADDR)
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taddr = 0;
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@ -407,9 +407,17 @@ void opal_lpc_init(void)
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if (opal_lpc_chip_id < 0)
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return;
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/* Setup special IO ops */
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ppc_pci_io = opal_lpc_io;
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isa_io_special = true;
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/* Does it support direct mapping ? */
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if (of_get_property(np, "ranges", NULL)) {
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pr_info("OPAL: Found memory mapped LPC bus on chip %d\n",
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opal_lpc_chip_id);
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isa_bridge_init_non_pci(np);
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} else {
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pr_info("OPAL: Found non-mapped LPC bus on chip %d\n",
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opal_lpc_chip_id);
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pr_info("OPAL: Power8 LPC bus found, chip ID %d\n", opal_lpc_chip_id);
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/* Setup special IO ops */
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ppc_pci_io = opal_lpc_io;
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isa_io_special = true;
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}
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}
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