0ebfff1491
This adds the new irq remapper core and removes the old one. Because there are some fundamental conflicts with the old code, like the value of NO_IRQ which I'm now setting to 0 (as per discussions with Linus), etc..., this commit also changes the relevant platform and driver code over to use the new remapper (so as not to cause difficulties later in bisecting). This patch removes the old pre-parsing of the open firmware interrupt tree along with all the bogus assumptions it made to try to renumber interrupts according to the platform. This is all to be handled by the new code now. For the pSeries XICS interrupt controller, a single remapper host is created for the whole machine regardless of how many interrupt presentation and source controllers are found, and it's set to match any device node that isn't a 8259. That works fine on pSeries and avoids having to deal with some of the complexities of split source controllers vs. presentation controllers in the pSeries device trees. The powerpc i8259 PIC driver now always requests the legacy interrupt range. It also has the feature of being able to match any device node (including NULL) if passed no device node as an input. That will help porting over platforms with broken device-trees like Pegasos who don't have a proper interrupt tree. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
329 lines
8.1 KiB
C
329 lines
8.1 KiB
C
/*
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* Maple (970 eval board) setup code
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*
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* (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
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* IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/major.h>
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#include <linux/initrd.h>
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#include <linux/vt_kern.h>
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#include <linux/console.h>
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#include <linux/ide.h>
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#include <linux/pci.h>
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#include <linux/adb.h>
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#include <linux/cuda.h>
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#include <linux/pmu.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/serial.h>
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#include <linux/smp.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/prom.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/bitops.h>
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#include <asm/io.h>
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#include <asm/kexec.h>
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#include <asm/pci-bridge.h>
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#include <asm/iommu.h>
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#include <asm/machdep.h>
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#include <asm/dma.h>
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#include <asm/cputable.h>
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#include <asm/time.h>
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#include <asm/of_device.h>
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#include <asm/lmb.h>
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#include <asm/mpic.h>
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#include <asm/udbg.h>
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#include "maple.h"
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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static unsigned long maple_find_nvram_base(void)
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{
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struct device_node *rtcs;
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unsigned long result = 0;
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/* find NVRAM device */
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rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
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if (rtcs) {
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struct resource r;
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if (of_address_to_resource(rtcs, 0, &r)) {
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printk(KERN_EMERG "Maple: Unable to translate NVRAM"
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" address\n");
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goto bail;
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}
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if (!(r.flags & IORESOURCE_IO)) {
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printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
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goto bail;
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}
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result = r.start;
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} else
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printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
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bail:
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of_node_put(rtcs);
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return result;
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}
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static void maple_restart(char *cmd)
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{
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unsigned int maple_nvram_base;
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unsigned int maple_nvram_offset;
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unsigned int maple_nvram_command;
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struct device_node *sp;
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maple_nvram_base = maple_find_nvram_base();
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if (maple_nvram_base == 0)
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goto fail;
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/* find service processor device */
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sp = of_find_node_by_name(NULL, "service-processor");
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if (!sp) {
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printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
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goto fail;
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}
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maple_nvram_offset = *(unsigned int*) get_property(sp,
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"restart-addr", NULL);
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maple_nvram_command = *(unsigned int*) get_property(sp,
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"restart-value", NULL);
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of_node_put(sp);
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/* send command */
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outb_p(maple_nvram_command, maple_nvram_base + maple_nvram_offset);
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for (;;) ;
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fail:
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printk(KERN_EMERG "Maple: Manual Restart Required\n");
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}
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static void maple_power_off(void)
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{
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unsigned int maple_nvram_base;
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unsigned int maple_nvram_offset;
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unsigned int maple_nvram_command;
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struct device_node *sp;
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maple_nvram_base = maple_find_nvram_base();
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if (maple_nvram_base == 0)
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goto fail;
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/* find service processor device */
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sp = of_find_node_by_name(NULL, "service-processor");
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if (!sp) {
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printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
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goto fail;
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}
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maple_nvram_offset = *(unsigned int*) get_property(sp,
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"power-off-addr", NULL);
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maple_nvram_command = *(unsigned int*) get_property(sp,
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"power-off-value", NULL);
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of_node_put(sp);
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/* send command */
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outb_p(maple_nvram_command, maple_nvram_base + maple_nvram_offset);
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for (;;) ;
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fail:
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printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
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}
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static void maple_halt(void)
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{
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maple_power_off();
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}
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#ifdef CONFIG_SMP
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struct smp_ops_t maple_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 = smp_generic_give_timebase,
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.take_timebase = smp_generic_take_timebase,
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};
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#endif /* CONFIG_SMP */
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void __init maple_setup_arch(void)
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{
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/* init to some ~sane value until calibrate_delay() runs */
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loops_per_jiffy = 50000000;
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/* Setup SMP callback */
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#ifdef CONFIG_SMP
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smp_ops = &maple_smp_ops;
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#endif
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/* Lookup PCI hosts */
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maple_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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printk(KERN_DEBUG "Using native/NAP idle loop\n");
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}
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/*
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* Early initialization.
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*/
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static void __init maple_init_early(void)
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{
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DBG(" -> maple_init_early\n");
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iommu_init_early_dart();
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DBG(" <- maple_init_early\n");
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}
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/*
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* This is almost identical to pSeries and CHRP. We need to make that
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* code generic at one point, with appropriate bits in the device-tree to
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* identify the presence of an HT APIC
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*/
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static void __init maple_init_IRQ(void)
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{
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struct device_node *root, *np, *mpic_node = NULL;
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unsigned int *opprop;
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unsigned long openpic_addr = 0;
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int naddr, n, i, opplen, has_isus = 0;
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struct mpic *mpic;
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unsigned int flags = MPIC_PRIMARY;
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/* Locate MPIC in the device-tree. Note that there is a bug
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* in Maple device-tree where the type of the controller is
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* open-pic and not interrupt-controller
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*/
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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 == NULL) {
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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 = prom_n_addr_cells(root);
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opprop = (unsigned int *) get_property(root, "platform-open-pic",
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&opplen);
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if (opprop != 0) {
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openpic_addr = of_read_number(opprop, naddr);
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has_isus = (opplen > naddr);
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printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
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openpic_addr, has_isus);
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}
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of_node_put(root);
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BUG_ON(openpic_addr == 0);
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/* Check for a big endian MPIC */
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if (get_property(np, "big-endian", NULL) != NULL)
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flags |= MPIC_BIG_ENDIAN;
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/* XXX Maple specific bits */
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flags |= MPIC_BROKEN_U3 | MPIC_WANTS_RESET;
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/* Setup the openpic driver. More device-tree junks, we hard code no
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* ISUs for now. I'll have to revisit some stuffs with the folks doing
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* the firmware for those
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*/
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mpic = mpic_alloc(mpic_node, openpic_addr, flags,
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/*has_isus ? 16 :*/ 0, 0, " MPIC ");
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BUG_ON(mpic == NULL);
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/* Add ISUs */
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opplen /= sizeof(u32);
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for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
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unsigned long isuaddr = of_read_number(opprop + i, naddr);
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mpic_assign_isu(mpic, n, isuaddr);
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}
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/* All ISUs are setup, complete initialization */
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mpic_init(mpic);
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ppc_md.get_irq = mpic_get_irq;
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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 maple_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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/*
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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 maple_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, "Momentum,Maple") &&
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!of_flat_dt_is_compatible(root, "Momentum,Apache"))
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return 0;
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/*
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* On U3, the DART (iommu) must be allocated now since it
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* has an impact on htab_initialize (due to the large page it
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* occupies having to be broken up so the DART itself is not
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* part of the cacheable linar mapping
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*/
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alloc_dart_table();
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hpte_init_native();
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return 1;
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}
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define_machine(maple_md) {
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.name = "Maple",
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.probe = maple_probe,
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.setup_arch = maple_setup_arch,
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.init_early = maple_init_early,
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.init_IRQ = maple_init_IRQ,
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.pcibios_fixup = maple_pcibios_fixup,
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.pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
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.restart = maple_restart,
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.power_off = maple_power_off,
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.halt = maple_halt,
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.get_boot_time = maple_get_boot_time,
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.set_rtc_time = maple_set_rtc_time,
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.get_rtc_time = maple_get_rtc_time,
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.calibrate_decr = generic_calibrate_decr,
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.progress = maple_progress,
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.power_save = power4_idle,
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#ifdef CONFIG_KEXEC
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.machine_kexec = default_machine_kexec,
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.machine_kexec_prepare = default_machine_kexec_prepare,
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.machine_crash_shutdown = default_machine_crash_shutdown,
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#endif
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};
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