636 lines
15 KiB
C
636 lines
15 KiB
C
/*
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* 64-bit pSeries and RS/6000 setup code.
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*
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* Copyright (C) 1995 Linus Torvalds
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* Adapted from 'alpha' version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* Modified by PPC64 Team, 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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* bootup setup stuff..
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*/
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#undef DEBUG
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#include <linux/config.h>
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#include <linux/cpu.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/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/major.h>
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#include <linux/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <linux/utsname.h>
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#include <linux/adb.h>
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#include <linux/module.h>
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#include <linux/delay.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 <asm/mmu.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/pci-bridge.h>
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#include <asm/iommu.h>
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#include <asm/dma.h>
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#include <asm/machdep.h>
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#include <asm/irq.h>
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#include <asm/kexec.h>
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#include <asm/time.h>
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#include <asm/nvram.h>
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#include "xics.h"
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#include <asm/firmware.h>
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#include <asm/pmc.h>
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#include <asm/mpic.h>
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#include <asm/ppc-pci.h>
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#include <asm/i8259.h>
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#include <asm/udbg.h>
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#include <asm/smp.h>
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#include "plpar_wrappers.h"
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#include "ras.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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extern void find_udbg_vterm(void);
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int fwnmi_active; /* TRUE if an FWNMI handler is present */
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static void pseries_shared_idle(void);
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static void pseries_dedicated_idle(void);
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struct mpic *pSeries_mpic;
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static void pSeries_show_cpuinfo(struct seq_file *m)
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{
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struct device_node *root;
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const char *model = "";
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root = of_find_node_by_path("/");
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if (root)
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model = get_property(root, "model", NULL);
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seq_printf(m, "machine\t\t: CHRP %s\n", model);
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of_node_put(root);
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}
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/* Initialize firmware assisted non-maskable interrupts if
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* the firmware supports this feature.
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*/
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static void __init fwnmi_init(void)
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{
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unsigned long system_reset_addr, machine_check_addr;
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int ibm_nmi_register = rtas_token("ibm,nmi-register");
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if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
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return;
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/* If the kernel's not linked at zero we point the firmware at low
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* addresses anyway, and use a trampoline to get to the real code. */
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system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
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machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
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if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
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machine_check_addr))
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fwnmi_active = 1;
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}
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static void __init pSeries_init_mpic(void)
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{
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unsigned int *addrp;
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struct device_node *np;
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unsigned long intack = 0;
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/* All ISUs are setup, complete initialization */
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mpic_init(pSeries_mpic);
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/* Check what kind of cascade ACK we have */
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if (!(np = of_find_node_by_name(NULL, "pci"))
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|| !(addrp = (unsigned int *)
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get_property(np, "8259-interrupt-acknowledge", NULL)))
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printk(KERN_ERR "Cannot find pci to get ack address\n");
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else
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intack = addrp[prom_n_addr_cells(np)-1];
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of_node_put(np);
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/* Setup the legacy interrupts & controller */
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i8259_init(intack, 0);
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/* Hook cascade to mpic */
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mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
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}
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static void __init pSeries_setup_mpic(void)
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{
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unsigned int *opprop;
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unsigned long openpic_addr = 0;
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unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
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struct device_node *root;
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int irq_count;
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/* Find the Open PIC if present */
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root = of_find_node_by_path("/");
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opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
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if (opprop != 0) {
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int n = prom_n_addr_cells(root);
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for (openpic_addr = 0; n > 0; --n)
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openpic_addr = (openpic_addr << 32) + *opprop++;
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printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
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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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/* Get the sense values from OF */
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prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
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/* Setup the openpic driver */
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irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
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pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
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16, 16, irq_count, /* isu size, irq offset, irq count */
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NR_IRQS - 4, /* ipi offset */
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senses, irq_count, /* sense & sense size */
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" MPIC ");
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}
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static void pseries_lpar_enable_pmcs(void)
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{
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unsigned long set, reset;
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power4_enable_pmcs();
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set = 1UL << 63;
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reset = 0;
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plpar_hcall_norets(H_PERFMON, set, reset);
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/* instruct hypervisor to maintain PMCs */
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if (firmware_has_feature(FW_FEATURE_SPLPAR))
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get_paca()->lppaca.pmcregs_in_use = 1;
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}
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static void __init pSeries_setup_arch(void)
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{
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/* Fixup ppc_md depending on the type of interrupt controller */
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if (ppc64_interrupt_controller == IC_OPEN_PIC) {
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ppc_md.init_IRQ = pSeries_init_mpic;
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ppc_md.get_irq = mpic_get_irq;
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/* Allocate the mpic now, so that find_and_init_phbs() can
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* fill the ISUs */
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pSeries_setup_mpic();
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} else {
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ppc_md.init_IRQ = xics_init_IRQ;
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ppc_md.get_irq = xics_get_irq;
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}
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#ifdef CONFIG_SMP
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smp_init_pSeries();
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#endif
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/* openpic global configuration register (64-bit format). */
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/* openpic Interrupt Source Unit pointer (64-bit format). */
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/* python0 facility area (mmio) (64-bit format) REAL address. */
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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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if (ROOT_DEV == 0) {
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printk("No ramdisk, default root is /dev/sda2\n");
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ROOT_DEV = Root_SDA2;
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}
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fwnmi_init();
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/* Find and initialize PCI host bridges */
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init_pci_config_tokens();
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find_and_init_phbs();
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eeh_init();
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pSeries_nvram_init();
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/* Choose an idle loop */
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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vpa_init(boot_cpuid);
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if (get_paca()->lppaca.shared_proc) {
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printk(KERN_INFO "Using shared processor idle loop\n");
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ppc_md.idle_loop = pseries_shared_idle;
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} else {
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printk(KERN_INFO "Using dedicated idle loop\n");
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ppc_md.idle_loop = pseries_dedicated_idle;
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}
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} else {
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printk(KERN_INFO "Using default idle loop\n");
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ppc_md.idle_loop = default_idle;
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}
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if (platform_is_lpar())
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ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
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else
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ppc_md.enable_pmcs = power4_enable_pmcs;
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}
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static int __init pSeries_init_panel(void)
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{
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/* Manually leave the kernel version on the panel. */
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ppc_md.progress("Linux ppc64\n", 0);
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ppc_md.progress(system_utsname.version, 0);
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return 0;
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}
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arch_initcall(pSeries_init_panel);
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/* Build up the ppc64_firmware_features bitmask field
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* using contents of device-tree/ibm,hypertas-functions.
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* Ultimately this functionality may be moved into prom.c prom_init().
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*/
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static void __init fw_feature_init(void)
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{
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struct device_node * dn;
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char * hypertas;
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unsigned int len;
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DBG(" -> fw_feature_init()\n");
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ppc64_firmware_features = 0;
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dn = of_find_node_by_path("/rtas");
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if (dn == NULL) {
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printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
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goto no_rtas;
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}
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hypertas = get_property(dn, "ibm,hypertas-functions", &len);
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if (hypertas) {
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while (len > 0){
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int i, hypertas_len;
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/* check value against table of strings */
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for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
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if ((firmware_features_table[i].name) &&
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(strcmp(firmware_features_table[i].name,hypertas))==0) {
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/* we have a match */
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ppc64_firmware_features |=
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(firmware_features_table[i].val);
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break;
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}
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}
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hypertas_len = strlen(hypertas);
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len -= hypertas_len +1;
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hypertas+= hypertas_len +1;
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}
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}
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of_node_put(dn);
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no_rtas:
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DBG(" <- fw_feature_init()\n");
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}
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static void __init pSeries_discover_pic(void)
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{
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struct device_node *np;
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char *typep;
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/*
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* Setup interrupt mapping options that are needed for finish_device_tree
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* to properly parse the OF interrupt tree & do the virtual irq mapping
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*/
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__irq_offset_value = NUM_ISA_INTERRUPTS;
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ppc64_interrupt_controller = IC_INVALID;
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for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
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typep = (char *)get_property(np, "compatible", NULL);
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if (strstr(typep, "open-pic")) {
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ppc64_interrupt_controller = IC_OPEN_PIC;
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break;
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} else if (strstr(typep, "ppc-xicp")) {
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ppc64_interrupt_controller = IC_PPC_XIC;
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break;
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}
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}
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if (ppc64_interrupt_controller == IC_INVALID)
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printk("pSeries_discover_pic: failed to recognize"
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" interrupt-controller\n");
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}
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static void pSeries_mach_cpu_die(void)
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{
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local_irq_disable();
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idle_task_exit();
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/* Some hardware requires clearing the CPPR, while other hardware does not
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* it is safe either way
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*/
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pSeriesLP_cppr_info(0, 0);
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rtas_stop_self();
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/* Should never get here... */
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BUG();
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for(;;);
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}
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static int pseries_set_dabr(unsigned long dabr)
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{
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return plpar_hcall_norets(H_SET_DABR, dabr);
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}
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static int pseries_set_xdabr(unsigned long dabr)
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{
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/* We want to catch accesses from kernel and userspace */
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return plpar_hcall_norets(H_SET_XDABR, dabr,
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H_DABRX_KERNEL | H_DABRX_USER);
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}
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/*
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* Early initialization. Relocation is on but do not reference unbolted pages
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*/
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static void __init pSeries_init_early(void)
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{
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int iommu_off = 0;
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DBG(" -> pSeries_init_early()\n");
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fw_feature_init();
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if (platform_is_lpar())
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hpte_init_lpar();
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else {
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hpte_init_native();
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iommu_off = (of_chosen &&
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get_property(of_chosen, "linux,iommu-off", NULL));
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}
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if (platform_is_lpar())
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find_udbg_vterm();
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if (firmware_has_feature(FW_FEATURE_DABR))
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ppc_md.set_dabr = pseries_set_dabr;
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else if (firmware_has_feature(FW_FEATURE_XDABR))
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ppc_md.set_dabr = pseries_set_xdabr;
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iommu_init_early_pSeries();
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pSeries_discover_pic();
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DBG(" <- pSeries_init_early()\n");
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}
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static int pSeries_check_legacy_ioport(unsigned int baseport)
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{
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struct device_node *np;
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#define I8042_DATA_REG 0x60
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#define FDC_BASE 0x3f0
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switch(baseport) {
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case I8042_DATA_REG:
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np = of_find_node_by_type(NULL, "8042");
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if (np == NULL)
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return -ENODEV;
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of_node_put(np);
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break;
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case FDC_BASE:
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np = of_find_node_by_type(NULL, "fdc");
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if (np == NULL)
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return -ENODEV;
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of_node_put(np);
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break;
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}
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return 0;
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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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extern struct machdep_calls pSeries_md;
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static int __init pSeries_probe(int platform)
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{
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if (platform != PLATFORM_PSERIES &&
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platform != PLATFORM_PSERIES_LPAR)
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return 0;
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/* if we have some ppc_md fixups for LPAR to do, do
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* it here ...
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*/
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return 1;
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}
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DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
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static inline void dedicated_idle_sleep(unsigned int cpu)
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{
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struct paca_struct *ppaca = &paca[cpu ^ 1];
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/* Only sleep if the other thread is not idle */
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if (!(ppaca->lppaca.idle)) {
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local_irq_disable();
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/*
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* We are about to sleep the thread and so wont be polling any
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* more.
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*/
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clear_thread_flag(TIF_POLLING_NRFLAG);
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smp_mb__after_clear_bit();
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/*
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* SMT dynamic mode. Cede will result in this thread going
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* dormant, if the partner thread is still doing work. Thread
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* wakes up if partner goes idle, an interrupt is presented, or
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* a prod occurs. Returning from the cede enables external
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* interrupts.
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*/
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if (!need_resched())
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cede_processor();
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else
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local_irq_enable();
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set_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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/*
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* Give the HV an opportunity at the processor, since we are
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* not doing any work.
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*/
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poll_pending();
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}
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}
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static void pseries_dedicated_idle(void)
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{
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struct paca_struct *lpaca = get_paca();
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unsigned int cpu = smp_processor_id();
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unsigned long start_snooze;
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unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
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set_thread_flag(TIF_POLLING_NRFLAG);
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while (1) {
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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lpaca->lppaca.idle = 1;
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if (!need_resched()) {
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start_snooze = get_tb() +
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*smt_snooze_delay * tb_ticks_per_usec;
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while (!need_resched() && !cpu_is_offline(cpu)) {
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ppc64_runlatch_off();
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/*
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* Go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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if (*smt_snooze_delay != 0 &&
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get_tb() > start_snooze) {
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HMT_medium();
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dedicated_idle_sleep(cpu);
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}
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}
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HMT_medium();
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}
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lpaca->lppaca.idle = 0;
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ppc64_runlatch_on();
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
|
|
cpu_die();
|
|
}
|
|
}
|
|
|
|
static void pseries_shared_idle(void)
|
|
{
|
|
struct paca_struct *lpaca = get_paca();
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
while (1) {
|
|
/*
|
|
* Indicate to the HV that we are idle. Now would be
|
|
* a good time to find other work to dispatch.
|
|
*/
|
|
lpaca->lppaca.idle = 1;
|
|
|
|
while (!need_resched() && !cpu_is_offline(cpu)) {
|
|
local_irq_disable();
|
|
ppc64_runlatch_off();
|
|
|
|
/*
|
|
* Yield the processor to the hypervisor. We return if
|
|
* an external interrupt occurs (which are driven prior
|
|
* to returning here) or if a prod occurs from another
|
|
* processor. When returning here, external interrupts
|
|
* are enabled.
|
|
*
|
|
* Check need_resched() again with interrupts disabled
|
|
* to avoid a race.
|
|
*/
|
|
if (!need_resched())
|
|
cede_processor();
|
|
else
|
|
local_irq_enable();
|
|
|
|
HMT_medium();
|
|
}
|
|
|
|
lpaca->lppaca.idle = 0;
|
|
ppc64_runlatch_on();
|
|
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
|
|
if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
|
|
cpu_die();
|
|
}
|
|
}
|
|
|
|
static int pSeries_pci_probe_mode(struct pci_bus *bus)
|
|
{
|
|
if (platform_is_lpar())
|
|
return PCI_PROBE_DEVTREE;
|
|
return PCI_PROBE_NORMAL;
|
|
}
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
|
|
{
|
|
/* Don't risk a hypervisor call if we're crashing */
|
|
if (!crash_shutdown) {
|
|
unsigned long vpa = __pa(&get_paca()->lppaca);
|
|
|
|
if (unregister_vpa(hard_smp_processor_id(), vpa)) {
|
|
printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
|
|
"failed\n", smp_processor_id(),
|
|
hard_smp_processor_id());
|
|
}
|
|
}
|
|
|
|
if (ppc64_interrupt_controller == IC_OPEN_PIC)
|
|
mpic_teardown_this_cpu(secondary);
|
|
else
|
|
xics_teardown_cpu(secondary);
|
|
}
|
|
#endif
|
|
|
|
struct machdep_calls __initdata pSeries_md = {
|
|
.probe = pSeries_probe,
|
|
.setup_arch = pSeries_setup_arch,
|
|
.init_early = pSeries_init_early,
|
|
.show_cpuinfo = pSeries_show_cpuinfo,
|
|
.log_error = pSeries_log_error,
|
|
.pcibios_fixup = pSeries_final_fixup,
|
|
.pci_probe_mode = pSeries_pci_probe_mode,
|
|
.irq_bus_setup = pSeries_irq_bus_setup,
|
|
.restart = rtas_restart,
|
|
.power_off = rtas_power_off,
|
|
.halt = rtas_halt,
|
|
.panic = rtas_os_term,
|
|
.cpu_die = pSeries_mach_cpu_die,
|
|
.get_boot_time = rtas_get_boot_time,
|
|
.get_rtc_time = rtas_get_rtc_time,
|
|
.set_rtc_time = rtas_set_rtc_time,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
.progress = rtas_progress,
|
|
.check_legacy_ioport = pSeries_check_legacy_ioport,
|
|
.system_reset_exception = pSeries_system_reset_exception,
|
|
.machine_check_exception = pSeries_machine_check_exception,
|
|
#ifdef CONFIG_KEXEC
|
|
.kexec_cpu_down = pseries_kexec_cpu_down,
|
|
.machine_kexec = default_machine_kexec,
|
|
.machine_kexec_prepare = default_machine_kexec_prepare,
|
|
.machine_crash_shutdown = default_machine_crash_shutdown,
|
|
#endif
|
|
};
|