dc559f7cd5
Rework timebase handoff to play nice with configurations with more than 2 cores, as well as with CPU hotplug. Previous scheme just pushed out the current timebase from the giving core to all cores without caring if they wanted it or not, nor checking if they'd taken it. The taking side didn't make sure the giving side had provided a value yet either. In other words, it was completely broken. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
/*
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* Copyright (C) 2006-2007 PA Semi, Inc
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*
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* Authors: Kip Walker, PA Semi
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* Olof Johansson, PA Semi
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*
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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/setup.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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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <asm/prom.h>
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#include <asm/system.h>
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#include <asm/iommu.h>
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#include <asm/machdep.h>
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#include <asm/mpic.h>
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#include <asm/smp.h>
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#include <asm/time.h>
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#include <asm/of_platform.h>
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#include "pasemi.h"
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static void __iomem *reset_reg;
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static void pas_restart(char *cmd)
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{
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printk("Restarting...\n");
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while (1)
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out_le32(reset_reg, 0x6000000);
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}
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#ifdef CONFIG_SMP
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static DEFINE_SPINLOCK(timebase_lock);
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static unsigned long timebase;
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static void __devinit pas_give_timebase(void)
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{
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spin_lock(&timebase_lock);
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mtspr(SPRN_TBCTL, TBCTL_FREEZE);
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isync();
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timebase = get_tb();
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spin_unlock(&timebase_lock);
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while (timebase)
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barrier();
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mtspr(SPRN_TBCTL, TBCTL_RESTART);
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}
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static void __devinit pas_take_timebase(void)
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{
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while (!timebase)
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smp_rmb();
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spin_lock(&timebase_lock);
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set_tb(timebase >> 32, timebase & 0xffffffff);
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timebase = 0;
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spin_unlock(&timebase_lock);
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}
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struct smp_ops_t pas_smp_ops = {
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.probe = smp_mpic_probe,
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.message_pass = smp_mpic_message_pass,
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.kick_cpu = smp_generic_kick_cpu,
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.setup_cpu = smp_mpic_setup_cpu,
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.give_timebase = pas_give_timebase,
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.take_timebase = pas_take_timebase,
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};
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#endif /* CONFIG_SMP */
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void __init pas_setup_arch(void)
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{
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#ifdef CONFIG_SMP
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/* Setup SMP callback */
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smp_ops = &pas_smp_ops;
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#endif
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/* Lookup PCI hosts */
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pas_pci_init();
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#ifdef CONFIG_DUMMY_CONSOLE
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conswitchp = &dummy_con;
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#endif
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/* Remap SDC register for doing reset */
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/* XXXOJN This should maybe come out of the device tree */
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reset_reg = ioremap(0xfc101100, 4);
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pasemi_idle_init();
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}
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static __init void pas_init_IRQ(void)
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{
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struct device_node *np;
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struct device_node *root, *mpic_node;
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unsigned long openpic_addr;
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const unsigned int *opprop;
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int naddr, opplen;
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struct mpic *mpic;
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mpic_node = NULL;
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for_each_node_by_type(np, "interrupt-controller")
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if (of_device_is_compatible(np, "open-pic")) {
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mpic_node = np;
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break;
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}
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if (!mpic_node)
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for_each_node_by_type(np, "open-pic") {
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mpic_node = np;
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break;
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}
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if (!mpic_node) {
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printk(KERN_ERR
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"Failed to locate the MPIC interrupt controller\n");
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return;
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}
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/* Find address list in /platform-open-pic */
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root = of_find_node_by_path("/");
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naddr = of_n_addr_cells(root);
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opprop = of_get_property(root, "platform-open-pic", &opplen);
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if (!opprop) {
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printk(KERN_ERR "No platform-open-pic property.\n");
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of_node_put(root);
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return;
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}
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openpic_addr = of_read_number(opprop, naddr);
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printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
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mpic = mpic_alloc(mpic_node, openpic_addr,
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MPIC_PRIMARY|MPIC_LARGE_VECTORS|MPIC_WANTS_RESET,
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0, 0, " PAS-OPIC ");
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BUG_ON(!mpic);
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mpic_assign_isu(mpic, 0, openpic_addr + 0x10000);
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mpic_init(mpic);
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of_node_put(mpic_node);
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of_node_put(root);
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}
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static void __init pas_progress(char *s, unsigned short hex)
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{
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printk("[%04x] : %s\n", hex, s ? s : "");
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}
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static int pas_machine_check_handler(struct pt_regs *regs)
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{
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int cpu = smp_processor_id();
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unsigned long srr0, srr1, dsisr;
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srr0 = regs->nip;
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srr1 = regs->msr;
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dsisr = mfspr(SPRN_DSISR);
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printk(KERN_ERR "Machine Check on CPU %d\n", cpu);
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printk(KERN_ERR "SRR0 0x%016lx SRR1 0x%016lx\n", srr0, srr1);
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printk(KERN_ERR "DSISR 0x%016lx DAR 0x%016lx\n", dsisr, regs->dar);
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printk(KERN_ERR "Cause:\n");
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if (srr1 & 0x200000)
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printk(KERN_ERR "Signalled by SDC\n");
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if (srr1 & 0x100000) {
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printk(KERN_ERR "Load/Store detected error:\n");
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if (dsisr & 0x8000)
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printk(KERN_ERR "D-cache ECC double-bit error or bus error\n");
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if (dsisr & 0x4000)
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printk(KERN_ERR "LSU snoop response error\n");
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if (dsisr & 0x2000)
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printk(KERN_ERR "MMU SLB multi-hit or invalid B field\n");
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if (dsisr & 0x1000)
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printk(KERN_ERR "Recoverable Duptags\n");
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if (dsisr & 0x800)
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printk(KERN_ERR "Recoverable D-cache parity error count overflow\n");
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if (dsisr & 0x400)
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printk(KERN_ERR "TLB parity error count overflow\n");
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}
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if (srr1 & 0x80000)
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printk(KERN_ERR "Bus Error\n");
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if (srr1 & 0x40000)
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printk(KERN_ERR "I-side SLB multiple hit\n");
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if (srr1 & 0x20000)
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printk(KERN_ERR "I-cache parity error hit\n");
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/* SRR1[62] is from MSR[62] if recoverable, so pass that back */
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return !!(srr1 & 0x2);
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}
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static void __init pas_init_early(void)
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{
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iommu_init_early_pasemi();
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}
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static struct of_device_id pasemi_bus_ids[] = {
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{ .type = "sdc", },
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{},
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};
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static int __init pasemi_publish_devices(void)
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{
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if (!machine_is(pasemi))
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return 0;
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/* Publish OF platform devices for SDC and other non-PCI devices */
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of_platform_bus_probe(NULL, pasemi_bus_ids, NULL);
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return 0;
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}
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device_initcall(pasemi_publish_devices);
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/*
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* Called very early, MMU is off, device-tree isn't unflattened
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*/
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static int __init pas_probe(void)
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{
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unsigned long root = of_get_flat_dt_root();
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if (!of_flat_dt_is_compatible(root, "PA6T-1682M"))
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return 0;
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hpte_init_native();
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alloc_iobmap_l2();
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return 1;
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}
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define_machine(pasemi) {
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.name = "PA Semi PA6T-1682M",
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.probe = pas_probe,
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.setup_arch = pas_setup_arch,
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.init_early = pas_init_early,
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.init_IRQ = pas_init_IRQ,
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.get_irq = mpic_get_irq,
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.restart = pas_restart,
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.get_boot_time = pas_get_boot_time,
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.calibrate_decr = generic_calibrate_decr,
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.progress = pas_progress,
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.machine_check_exception = pas_machine_check_handler,
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};
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