608 lines
15 KiB
C
608 lines
15 KiB
C
/*
|
|
* 64-bit pSeries and RS/6000 setup code.
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* Adapted from 'alpha' version by Gary Thomas
|
|
* Modified by Cort Dougan (cort@cs.nmt.edu)
|
|
* Modified by PPC64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
/*
|
|
* bootup setup stuff..
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/user.h>
|
|
#include <linux/a.out.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/major.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/console.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/adb.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/root_dev.h>
|
|
|
|
#include <asm/mmu.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/pci-bridge.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/time.h>
|
|
#include <asm/nvram.h>
|
|
#include <asm/plpar_wrappers.h>
|
|
#include <asm/xics.h>
|
|
#include <asm/firmware.h>
|
|
#include <asm/pmc.h>
|
|
#include <asm/mpic.h>
|
|
#include <asm/ppc-pci.h>
|
|
#include <asm/i8259.h>
|
|
#include <asm/udbg.h>
|
|
|
|
#include "rtas-fw.h"
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(fmt...) udbg_printf(fmt)
|
|
#else
|
|
#define DBG(fmt...)
|
|
#endif
|
|
|
|
extern void find_udbg_vterm(void);
|
|
extern void system_reset_fwnmi(void); /* from head.S */
|
|
extern void machine_check_fwnmi(void); /* from head.S */
|
|
extern void generic_find_legacy_serial_ports(u64 *physport,
|
|
unsigned int *default_speed);
|
|
|
|
int fwnmi_active; /* TRUE if an FWNMI handler is present */
|
|
|
|
extern void pSeries_system_reset_exception(struct pt_regs *regs);
|
|
extern int pSeries_machine_check_exception(struct pt_regs *regs);
|
|
|
|
static void pseries_shared_idle(void);
|
|
static void pseries_dedicated_idle(void);
|
|
|
|
struct mpic *pSeries_mpic;
|
|
|
|
void pSeries_show_cpuinfo(struct seq_file *m)
|
|
{
|
|
struct device_node *root;
|
|
const char *model = "";
|
|
|
|
root = of_find_node_by_path("/");
|
|
if (root)
|
|
model = get_property(root, "model", NULL);
|
|
seq_printf(m, "machine\t\t: CHRP %s\n", model);
|
|
of_node_put(root);
|
|
}
|
|
|
|
/* Initialize firmware assisted non-maskable interrupts if
|
|
* the firmware supports this feature.
|
|
*
|
|
*/
|
|
static void __init fwnmi_init(void)
|
|
{
|
|
int ret;
|
|
int ibm_nmi_register = rtas_token("ibm,nmi-register");
|
|
if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
|
|
return;
|
|
ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
|
|
__pa((unsigned long)system_reset_fwnmi),
|
|
__pa((unsigned long)machine_check_fwnmi));
|
|
if (ret == 0)
|
|
fwnmi_active = 1;
|
|
}
|
|
|
|
static void __init pSeries_init_mpic(void)
|
|
{
|
|
unsigned int *addrp;
|
|
struct device_node *np;
|
|
unsigned long intack = 0;
|
|
|
|
/* All ISUs are setup, complete initialization */
|
|
mpic_init(pSeries_mpic);
|
|
|
|
/* Check what kind of cascade ACK we have */
|
|
if (!(np = of_find_node_by_name(NULL, "pci"))
|
|
|| !(addrp = (unsigned int *)
|
|
get_property(np, "8259-interrupt-acknowledge", NULL)))
|
|
printk(KERN_ERR "Cannot find pci to get ack address\n");
|
|
else
|
|
intack = addrp[prom_n_addr_cells(np)-1];
|
|
of_node_put(np);
|
|
|
|
/* Setup the legacy interrupts & controller */
|
|
i8259_init(intack, 0);
|
|
|
|
/* Hook cascade to mpic */
|
|
mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
|
|
}
|
|
|
|
static void __init pSeries_setup_mpic(void)
|
|
{
|
|
unsigned int *opprop;
|
|
unsigned long openpic_addr = 0;
|
|
unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
|
|
struct device_node *root;
|
|
int irq_count;
|
|
|
|
/* Find the Open PIC if present */
|
|
root = of_find_node_by_path("/");
|
|
opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
|
|
if (opprop != 0) {
|
|
int n = prom_n_addr_cells(root);
|
|
|
|
for (openpic_addr = 0; n > 0; --n)
|
|
openpic_addr = (openpic_addr << 32) + *opprop++;
|
|
printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
|
|
}
|
|
of_node_put(root);
|
|
|
|
BUG_ON(openpic_addr == 0);
|
|
|
|
/* Get the sense values from OF */
|
|
prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
|
|
|
|
/* Setup the openpic driver */
|
|
irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
|
|
pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
|
|
16, 16, irq_count, /* isu size, irq offset, irq count */
|
|
NR_IRQS - 4, /* ipi offset */
|
|
senses, irq_count, /* sense & sense size */
|
|
" MPIC ");
|
|
}
|
|
|
|
static void pseries_lpar_enable_pmcs(void)
|
|
{
|
|
unsigned long set, reset;
|
|
|
|
power4_enable_pmcs();
|
|
|
|
set = 1UL << 63;
|
|
reset = 0;
|
|
plpar_hcall_norets(H_PERFMON, set, reset);
|
|
|
|
/* instruct hypervisor to maintain PMCs */
|
|
if (firmware_has_feature(FW_FEATURE_SPLPAR))
|
|
get_paca()->lppaca.pmcregs_in_use = 1;
|
|
}
|
|
|
|
static void __init pSeries_setup_arch(void)
|
|
{
|
|
/* Fixup ppc_md depending on the type of interrupt controller */
|
|
if (ppc64_interrupt_controller == IC_OPEN_PIC) {
|
|
ppc_md.init_IRQ = pSeries_init_mpic;
|
|
ppc_md.get_irq = mpic_get_irq;
|
|
ppc_md.cpu_irq_down = mpic_teardown_this_cpu;
|
|
/* Allocate the mpic now, so that find_and_init_phbs() can
|
|
* fill the ISUs */
|
|
pSeries_setup_mpic();
|
|
} else {
|
|
ppc_md.init_IRQ = xics_init_IRQ;
|
|
ppc_md.get_irq = xics_get_irq;
|
|
ppc_md.cpu_irq_down = xics_teardown_cpu;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
smp_init_pSeries();
|
|
#endif
|
|
/* openpic global configuration register (64-bit format). */
|
|
/* openpic Interrupt Source Unit pointer (64-bit format). */
|
|
/* python0 facility area (mmio) (64-bit format) REAL address. */
|
|
|
|
/* init to some ~sane value until calibrate_delay() runs */
|
|
loops_per_jiffy = 50000000;
|
|
|
|
if (ROOT_DEV == 0) {
|
|
printk("No ramdisk, default root is /dev/sda2\n");
|
|
ROOT_DEV = Root_SDA2;
|
|
}
|
|
|
|
fwnmi_init();
|
|
|
|
/* Find and initialize PCI host bridges */
|
|
init_pci_config_tokens();
|
|
find_and_init_phbs();
|
|
eeh_init();
|
|
|
|
pSeries_nvram_init();
|
|
|
|
/* Choose an idle loop */
|
|
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
|
|
vpa_init(boot_cpuid);
|
|
if (get_paca()->lppaca.shared_proc) {
|
|
printk(KERN_INFO "Using shared processor idle loop\n");
|
|
ppc_md.idle_loop = pseries_shared_idle;
|
|
} else {
|
|
printk(KERN_INFO "Using dedicated idle loop\n");
|
|
ppc_md.idle_loop = pseries_dedicated_idle;
|
|
}
|
|
} else {
|
|
printk(KERN_INFO "Using default idle loop\n");
|
|
ppc_md.idle_loop = default_idle;
|
|
}
|
|
|
|
if (systemcfg->platform & PLATFORM_LPAR)
|
|
ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
|
|
else
|
|
ppc_md.enable_pmcs = power4_enable_pmcs;
|
|
}
|
|
|
|
static int __init pSeries_init_panel(void)
|
|
{
|
|
/* Manually leave the kernel version on the panel. */
|
|
ppc_md.progress("Linux ppc64\n", 0);
|
|
ppc_md.progress(system_utsname.version, 0);
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(pSeries_init_panel);
|
|
|
|
|
|
/* Build up the ppc64_firmware_features bitmask field
|
|
* using contents of device-tree/ibm,hypertas-functions.
|
|
* Ultimately this functionality may be moved into prom.c prom_init().
|
|
*/
|
|
static void __init fw_feature_init(void)
|
|
{
|
|
struct device_node * dn;
|
|
char * hypertas;
|
|
unsigned int len;
|
|
|
|
DBG(" -> fw_feature_init()\n");
|
|
|
|
ppc64_firmware_features = 0;
|
|
dn = of_find_node_by_path("/rtas");
|
|
if (dn == NULL) {
|
|
printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
|
|
goto no_rtas;
|
|
}
|
|
|
|
hypertas = get_property(dn, "ibm,hypertas-functions", &len);
|
|
if (hypertas) {
|
|
while (len > 0){
|
|
int i, hypertas_len;
|
|
/* check value against table of strings */
|
|
for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
|
|
if ((firmware_features_table[i].name) &&
|
|
(strcmp(firmware_features_table[i].name,hypertas))==0) {
|
|
/* we have a match */
|
|
ppc64_firmware_features |=
|
|
(firmware_features_table[i].val);
|
|
break;
|
|
}
|
|
}
|
|
hypertas_len = strlen(hypertas);
|
|
len -= hypertas_len +1;
|
|
hypertas+= hypertas_len +1;
|
|
}
|
|
}
|
|
|
|
of_node_put(dn);
|
|
no_rtas:
|
|
printk(KERN_INFO "firmware_features = 0x%lx\n",
|
|
ppc64_firmware_features);
|
|
|
|
DBG(" <- fw_feature_init()\n");
|
|
}
|
|
|
|
|
|
static void __init pSeries_discover_pic(void)
|
|
{
|
|
struct device_node *np;
|
|
char *typep;
|
|
|
|
/*
|
|
* Setup interrupt mapping options that are needed for finish_device_tree
|
|
* to properly parse the OF interrupt tree & do the virtual irq mapping
|
|
*/
|
|
__irq_offset_value = NUM_ISA_INTERRUPTS;
|
|
ppc64_interrupt_controller = IC_INVALID;
|
|
for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
|
|
typep = (char *)get_property(np, "compatible", NULL);
|
|
if (strstr(typep, "open-pic"))
|
|
ppc64_interrupt_controller = IC_OPEN_PIC;
|
|
else if (strstr(typep, "ppc-xicp"))
|
|
ppc64_interrupt_controller = IC_PPC_XIC;
|
|
else
|
|
printk("pSeries_discover_pic: failed to recognize"
|
|
" interrupt-controller\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void pSeries_mach_cpu_die(void)
|
|
{
|
|
local_irq_disable();
|
|
idle_task_exit();
|
|
/* Some hardware requires clearing the CPPR, while other hardware does not
|
|
* it is safe either way
|
|
*/
|
|
pSeriesLP_cppr_info(0, 0);
|
|
rtas_stop_self();
|
|
/* Should never get here... */
|
|
BUG();
|
|
for(;;);
|
|
}
|
|
|
|
|
|
/*
|
|
* Early initialization. Relocation is on but do not reference unbolted pages
|
|
*/
|
|
static void __init pSeries_init_early(void)
|
|
{
|
|
void *comport;
|
|
int iommu_off = 0;
|
|
unsigned int default_speed;
|
|
u64 physport;
|
|
|
|
DBG(" -> pSeries_init_early()\n");
|
|
|
|
fw_feature_init();
|
|
|
|
if (systemcfg->platform & PLATFORM_LPAR)
|
|
hpte_init_lpar();
|
|
else {
|
|
hpte_init_native();
|
|
iommu_off = (of_chosen &&
|
|
get_property(of_chosen, "linux,iommu-off", NULL));
|
|
}
|
|
|
|
generic_find_legacy_serial_ports(&physport, &default_speed);
|
|
|
|
if (systemcfg->platform & PLATFORM_LPAR)
|
|
find_udbg_vterm();
|
|
else if (physport) {
|
|
/* Map the uart for udbg. */
|
|
comport = (void *)ioremap(physport, 16);
|
|
udbg_init_uart(comport, default_speed);
|
|
|
|
DBG("Hello World !\n");
|
|
}
|
|
|
|
|
|
iommu_init_early_pSeries();
|
|
|
|
pSeries_discover_pic();
|
|
|
|
DBG(" <- pSeries_init_early()\n");
|
|
}
|
|
|
|
|
|
static int pSeries_check_legacy_ioport(unsigned int baseport)
|
|
{
|
|
struct device_node *np;
|
|
|
|
#define I8042_DATA_REG 0x60
|
|
#define FDC_BASE 0x3f0
|
|
|
|
|
|
switch(baseport) {
|
|
case I8042_DATA_REG:
|
|
np = of_find_node_by_type(NULL, "8042");
|
|
if (np == NULL)
|
|
return -ENODEV;
|
|
of_node_put(np);
|
|
break;
|
|
case FDC_BASE:
|
|
np = of_find_node_by_type(NULL, "fdc");
|
|
if (np == NULL)
|
|
return -ENODEV;
|
|
of_node_put(np);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called very early, MMU is off, device-tree isn't unflattened
|
|
*/
|
|
extern struct machdep_calls pSeries_md;
|
|
|
|
static int __init pSeries_probe(int platform)
|
|
{
|
|
if (platform != PLATFORM_PSERIES &&
|
|
platform != PLATFORM_PSERIES_LPAR)
|
|
return 0;
|
|
|
|
/* if we have some ppc_md fixups for LPAR to do, do
|
|
* it here ...
|
|
*/
|
|
|
|
return 1;
|
|
}
|
|
|
|
DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
|
|
|
|
static inline void dedicated_idle_sleep(unsigned int cpu)
|
|
{
|
|
struct paca_struct *ppaca = &paca[cpu ^ 1];
|
|
|
|
/* Only sleep if the other thread is not idle */
|
|
if (!(ppaca->lppaca.idle)) {
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* We are about to sleep the thread and so wont be polling any
|
|
* more.
|
|
*/
|
|
clear_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
/*
|
|
* SMT dynamic mode. Cede will result in this thread going
|
|
* dormant, if the partner thread is still doing work. Thread
|
|
* wakes up if partner goes idle, an interrupt is presented, or
|
|
* a prod occurs. Returning from the cede enables external
|
|
* interrupts.
|
|
*/
|
|
if (!need_resched())
|
|
cede_processor();
|
|
else
|
|
local_irq_enable();
|
|
} else {
|
|
/*
|
|
* Give the HV an opportunity at the processor, since we are
|
|
* not doing any work.
|
|
*/
|
|
poll_pending();
|
|
}
|
|
}
|
|
|
|
static void pseries_dedicated_idle(void)
|
|
{
|
|
long oldval;
|
|
struct paca_struct *lpaca = get_paca();
|
|
unsigned int cpu = smp_processor_id();
|
|
unsigned long start_snooze;
|
|
unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
|
|
|
|
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;
|
|
|
|
oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
|
|
if (!oldval) {
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
start_snooze = __get_tb() +
|
|
*smt_snooze_delay * tb_ticks_per_usec;
|
|
|
|
while (!need_resched() && !cpu_is_offline(cpu)) {
|
|
ppc64_runlatch_off();
|
|
|
|
/*
|
|
* Go into low thread priority and possibly
|
|
* low power mode.
|
|
*/
|
|
HMT_low();
|
|
HMT_very_low();
|
|
|
|
if (*smt_snooze_delay != 0 &&
|
|
__get_tb() > start_snooze) {
|
|
HMT_medium();
|
|
dedicated_idle_sleep(cpu);
|
|
}
|
|
|
|
}
|
|
|
|
HMT_medium();
|
|
clear_thread_flag(TIF_POLLING_NRFLAG);
|
|
} else {
|
|
set_need_resched();
|
|
}
|
|
|
|
lpaca->lppaca.idle = 0;
|
|
ppc64_runlatch_on();
|
|
|
|
schedule();
|
|
|
|
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();
|
|
|
|
schedule();
|
|
|
|
if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
|
|
cpu_die();
|
|
}
|
|
}
|
|
|
|
static int pSeries_pci_probe_mode(struct pci_bus *bus)
|
|
{
|
|
if (systemcfg->platform & PLATFORM_LPAR)
|
|
return PCI_PROBE_DEVTREE;
|
|
return PCI_PROBE_NORMAL;
|
|
}
|
|
|
|
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_fw_restart,
|
|
.power_off = rtas_fw_power_off,
|
|
.halt = rtas_fw_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,
|
|
};
|