disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/arch/powerpc/platforms/pasemi/pci.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2006 PA Semi, Inc
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  *
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@@ -7,19 +8,6 @@
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  * Maintained by: Olof Johansson <olof@lixom.net>
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  *
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  * Based on arch/powerpc/platforms/maple/pci.c
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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  */
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12
 
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@@ -27,6 +15,7 @@
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 #include <linux/pci.h>
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 #include <asm/pci-bridge.h>
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+#include <asm/isa-bridge.h>
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 #include <asm/machdep.h>
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20
 
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 #include <asm/ppc-pci.h>
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@@ -108,6 +97,61 @@
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 	return 1;
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 }
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+#ifdef CONFIG_PPC_PASEMI_NEMO
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+#define PXP_ERR_CFG_REG	0x4
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+#define PXP_IGNORE_PCIE_ERRORS	0x800
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+#define SB600_BUS 5
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+
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+static void sb600_set_flag(int bus)
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+{
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+	static void __iomem *iob_mapbase = NULL;
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+	struct resource res;
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+	struct device_node *dn;
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+	int err;
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+
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+	if (iob_mapbase == NULL) {
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+		dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob");
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+		if (!dn) {
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+			pr_crit("NEMO SB600 missing iob node\n");
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+			return;
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+		}
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+
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+		err = of_address_to_resource(dn, 0, &res);
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+		of_node_put(dn);
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+
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+		if (err) {
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+			pr_crit("NEMO SB600 missing resource\n");
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+			return;
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+		}
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+
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+		pr_info("NEMO SB600 IOB base %08llx\n",res.start);
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+
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+		iob_mapbase = ioremap(res.start + 0x100, 0x94);
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+	}
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+
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+	if (iob_mapbase != NULL) {
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+		if (bus == SB600_BUS) {
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+			/*
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+			 * This is the SB600's bus, tell the PCI-e root port
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+			 * to allow non-zero devices to enumerate.
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+			 */
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+			out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) | PXP_IGNORE_PCIE_ERRORS);
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+		} else {
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+			/*
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+			 * Only scan device 0 on other busses
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+			 */
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+			out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) & ~PXP_IGNORE_PCIE_ERRORS);
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+		}
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+	}
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+}
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+
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+#else
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+
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+static void sb600_set_flag(int bus)
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+{
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+}
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+#endif
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+
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 static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
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 			      int offset, int len, u32 *val)
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 {
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@@ -125,6 +169,8 @@
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 		return PCIBIOS_SUCCESSFUL;
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 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
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+
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+	sb600_set_flag(bus->number);
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 	/*
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 	 * Note: the caller has already checked that offset is
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@@ -159,6 +205,8 @@
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 		return PCIBIOS_BAD_REGISTER_NUMBER;
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 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
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+
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+	sb600_set_flag(bus->number);
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 	/*
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 	 * Note: the caller has already checked that offset is
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@@ -210,6 +258,12 @@
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 	/* Interpret the "ranges" property */
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 	pci_process_bridge_OF_ranges(hose, dev, 1);
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+	/*
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+	 * Scan for an isa bridge. This is needed to find the SB600 on the nemo
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+	 * and does nothing on machines without one.
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+	 */
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+	isa_bridge_find_early(hose);
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+
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 	return 0;
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 }
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