557 lines
14 KiB
C
557 lines
14 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/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/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 <asm/firmware.h>
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#include "plpar_wrappers.h"
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#include "pseries.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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/* move those away to a .h */
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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_sleep(void);
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static void pseries_dedicated_idle_sleep(void);
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static struct device_node *pSeries_mpic_node;
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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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void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
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{
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unsigned int cascade_irq = i8259_irq();
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if (cascade_irq != NO_IRQ)
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generic_handle_irq(cascade_irq);
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desc->chip->eoi(irq);
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}
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static void __init pseries_mpic_init_IRQ(void)
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{
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struct device_node *np, *old, *cascade = NULL;
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const unsigned int *addrp;
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unsigned long intack = 0;
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const unsigned int *opprop;
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unsigned long openpic_addr = 0;
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unsigned int cascade_irq;
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int naddr, n, i, opplen;
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struct mpic *mpic;
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np = of_find_node_by_path("/");
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naddr = prom_n_addr_cells(np);
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opprop = get_property(np, "platform-open-pic", &opplen);
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if (opprop != 0) {
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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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}
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of_node_put(np);
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BUG_ON(openpic_addr == 0);
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/* Setup the openpic driver */
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mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
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MPIC_PRIMARY,
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16, 250, /* isu size, irq count */
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" 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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/* Look for cascade */
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for_each_node_by_type(np, "interrupt-controller")
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if (device_is_compatible(np, "chrp,iic")) {
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cascade = np;
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break;
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}
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if (cascade == NULL)
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return;
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cascade_irq = irq_of_parse_and_map(cascade, 0);
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if (cascade == NO_IRQ) {
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printk(KERN_ERR "mpic: failed to map cascade interrupt");
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return;
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}
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/* Check ACK type */
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for (old = of_node_get(cascade); old != NULL ; old = np) {
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np = of_get_parent(old);
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of_node_put(old);
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if (np == NULL)
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break;
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if (strcmp(np->name, "pci") != 0)
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continue;
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addrp = get_property(np, "8259-interrupt-acknowledge",
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NULL);
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if (addrp == NULL)
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continue;
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naddr = prom_n_addr_cells(np);
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intack = addrp[naddr-1];
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if (naddr > 1)
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intack |= ((unsigned long)addrp[naddr-2]) << 32;
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}
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if (intack)
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printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
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intack);
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i8259_init(cascade, intack);
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of_node_put(cascade);
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set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
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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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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_lppaca()->pmcregs_in_use = 1;
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}
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#ifdef CONFIG_KEXEC
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static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
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{
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/* Don't risk a hypervisor call if we're crashing */
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if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
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unsigned long addr;
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addr = __pa(get_slb_shadow());
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if (unregister_slb_shadow(hard_smp_processor_id(), addr))
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printk("SLB shadow buffer deregistration of "
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"cpu %u (hw_cpu_id %d) failed\n",
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smp_processor_id(),
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hard_smp_processor_id());
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addr = __pa(get_lppaca());
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if (unregister_vpa(hard_smp_processor_id(), addr)) {
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printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
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"failed\n", smp_processor_id(),
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hard_smp_processor_id());
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}
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}
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}
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static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
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{
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pseries_kexec_cpu_down(crash_shutdown, secondary);
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mpic_teardown_this_cpu(secondary);
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}
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static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
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{
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pseries_kexec_cpu_down(crash_shutdown, secondary);
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xics_teardown_cpu(secondary);
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}
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#endif /* CONFIG_KEXEC */
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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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const char *typep;
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for (np = NULL; (np = of_find_node_by_name(np,
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"interrupt-controller"));) {
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typep = get_property(np, "compatible", NULL);
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if (strstr(typep, "open-pic")) {
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pSeries_mpic_node = of_node_get(np);
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ppc_md.init_IRQ = pseries_mpic_init_IRQ;
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ppc_md.get_irq = mpic_get_irq;
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#ifdef CONFIG_KEXEC
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ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
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#endif
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smp_init_pseries_mpic();
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return;
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} else if (strstr(typep, "ppc-xicp")) {
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ppc_md.init_IRQ = xics_init_IRQ;
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#ifdef CONFIG_KEXEC
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ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
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#endif
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smp_init_pseries_xics();
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return;
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}
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}
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printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
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" interrupt-controller\n");
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}
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static void __init pSeries_setup_arch(void)
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{
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/* Discover PIC type and setup ppc_md accordingly */
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pseries_discover_pic();
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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_lppaca()->shared_proc) {
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printk(KERN_DEBUG "Using shared processor idle loop\n");
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ppc_md.power_save = pseries_shared_idle_sleep;
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} else {
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printk(KERN_DEBUG "Using dedicated idle loop\n");
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ppc_md.power_save = pseries_dedicated_idle_sleep;
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}
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} else {
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printk(KERN_DEBUG "Using default idle loop\n");
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}
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if (firmware_has_feature(FW_FEATURE_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(init_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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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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DBG(" -> pSeries_init_early()\n");
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fw_feature_init();
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if (firmware_has_feature(FW_FEATURE_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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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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static int __init pSeries_probe_hypertas(unsigned long node,
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const char *uname, int depth,
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void *data)
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{
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if (depth != 1 ||
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(strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
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return 0;
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if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
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powerpc_firmware_features |= FW_FEATURE_LPAR;
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return 1;
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}
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static int __init pSeries_probe(void)
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{
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unsigned long root = of_get_flat_dt_root();
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char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
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if (dtype == NULL)
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return 0;
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if (strcmp(dtype, "chrp"))
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return 0;
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/* Cell blades firmware claims to be chrp while it's not. Until this
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* is fixed, we need to avoid those here.
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*/
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if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
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of_flat_dt_is_compatible(root, "IBM,CBEA"))
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return 0;
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DBG("pSeries detected, looking for LPAR capability...\n");
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/* Now try to figure out if we are running on LPAR */
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of_scan_flat_dt(pSeries_probe_hypertas, NULL);
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if (firmware_has_feature(FW_FEATURE_LPAR))
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hpte_init_lpar();
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else
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hpte_init_native();
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DBG("Machine is%s LPAR !\n",
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(powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
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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 void pseries_dedicated_idle_sleep(void)
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{
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unsigned int cpu = smp_processor_id();
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unsigned long start_snooze;
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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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get_lppaca()->idle = 1;
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/*
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* We come in with interrupts disabled, and need_resched()
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* has been checked recently. If we should poll for a little
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* while, do so.
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*/
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if (__get_cpu_var(smt_snooze_delay)) {
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start_snooze = get_tb() +
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__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
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local_irq_enable();
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set_thread_flag(TIF_POLLING_NRFLAG);
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while (get_tb() < start_snooze) {
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if (need_resched() || cpu_is_offline(cpu))
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goto out;
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ppc64_runlatch_off();
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HMT_low();
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HMT_very_low();
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}
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HMT_medium();
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clear_thread_flag(TIF_POLLING_NRFLAG);
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smp_mb();
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local_irq_disable();
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if (need_resched() || cpu_is_offline(cpu))
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goto out;
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}
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cede_processor();
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out:
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HMT_medium();
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get_lppaca()->idle = 0;
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}
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static void pseries_shared_idle_sleep(void)
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{
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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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get_lppaca()->idle = 1;
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/*
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* Yield the processor to the hypervisor. We return if
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* 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.
|
|
*/
|
|
cede_processor();
|
|
|
|
get_lppaca()->idle = 0;
|
|
}
|
|
|
|
static int pSeries_pci_probe_mode(struct pci_bus *bus)
|
|
{
|
|
if (firmware_has_feature(FW_FEATURE_LPAR))
|
|
return PCI_PROBE_DEVTREE;
|
|
return PCI_PROBE_NORMAL;
|
|
}
|
|
|
|
define_machine(pseries) {
|
|
.name = "pSeries",
|
|
.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,
|
|
.restart = rtas_restart,
|
|
.power_off = rtas_power_off,
|
|
.halt = rtas_halt,
|
|
.panic = rtas_os_term,
|
|
.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
|
|
.machine_kexec = default_machine_kexec,
|
|
.machine_kexec_prepare = default_machine_kexec_prepare,
|
|
.machine_crash_shutdown = default_machine_crash_shutdown,
|
|
#endif
|
|
};
|