[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / arch / ppc64 / kernel / pSeries_setup.c

/*
 *  linux/arch/ppc/kernel/setup.c
 *
 *  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/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/version.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/cputable.h>

#include "i8259.h"
#include "mpic.h"
#include "pci.h"

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

extern void pSeries_final_fixup(void);

extern void pSeries_get_boot_time(struct rtc_time *rtc_time);
extern void pSeries_get_rtc_time(struct rtc_time *rtc_time);
extern int  pSeries_set_rtc_time(struct rtc_time *rtc_time);
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 unsigned long ppc_proc_freq;
extern unsigned long ppc_tb_freq;

extern void pSeries_system_reset_exception(struct pt_regs *regs);
extern int pSeries_machine_check_exception(struct pt_regs *regs);

static volatile void __iomem * chrp_int_ack_special;
struct mpic *pSeries_mpic;

void pSeries_get_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 int pSeries_irq_cascade(struct pt_regs *regs, void *data)
{
        if (chrp_int_ack_special)
                return readb(chrp_int_ack_special);
        else
                return i8259_irq(smp_processor_id());
}

static void __init pSeries_init_mpic(void)
{
        unsigned int *addrp;
        struct device_node *np;
        int i;

        /* 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
                chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
        of_node_put(np);

        /* Setup the legacy interrupts & controller */
        for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
                irq_desc[i].handler = &i8259_pic;
        i8259_init(0);

        /* Hook cascade to mpic */
        mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_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 __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;
                /* 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;
        }

#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();
        eeh_init();
        find_and_init_phbs();

#ifdef CONFIG_DUMMY_CONSOLE
        conswitchp = &dummy_con;
#endif

        pSeries_nvram_init();

        if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
                vpa_init(boot_cpuid);
}

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(UTS_RELEASE, 0);

        return 0;
}
arch_initcall(pSeries_init_panel);


/* Build up the firmware_features bitmask field
 * using contents of device-tree/ibm,hypertas-functions.
 * Ultimately this functionality may be moved into prom.c prom_init().
 */
void __init fw_feature_init(void)
{
        struct device_node * dn;
        char * hypertas;
        unsigned int len;

        DBG(" -> fw_feature_init()\n");

        cur_cpu_spec->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 */
                                        cur_cpu_spec->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", 
               cur_cpu_spec->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);

                ppc_md.udbg_putc = udbg_putc;
                ppc_md.udbg_getc = udbg_getc;
                ppc_md.udbg_getc_poll = udbg_getc_poll;
                DBG("Hello World !\n");
        }


        iommu_init_early_pSeries();

        pSeries_discover_pic();

        DBG(" <- pSeries_init_early()\n");
}


static void pSeries_progress(char *s, unsigned short hex)
{
        struct device_node *root;
        int width, *p;
        char *os;
        static int display_character, set_indicator;
        static int max_width;
        static DEFINE_SPINLOCK(progress_lock);
        static int pending_newline = 0;  /* did last write end with unprinted newline? */

        if (!rtas.base)
                return;

        if (max_width == 0) {
                if ((root = find_path_device("/rtas")) &&
                     (p = (unsigned int *)get_property(root,
                                                       "ibm,display-line-length",
                                                       NULL)))
                        max_width = *p;
                else
                        max_width = 0x10;
                display_character = rtas_token("display-character");
                set_indicator = rtas_token("set-indicator");
        }

        if (display_character == RTAS_UNKNOWN_SERVICE) {
                /* use hex display if available */
                if (set_indicator != RTAS_UNKNOWN_SERVICE)
                        rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex);
                return;
        }

        spin_lock(&progress_lock);

        /*
         * Last write ended with newline, but we didn't print it since
         * it would just clear the bottom line of output. Print it now
         * instead.
         *
         * If no newline is pending, print a CR to start output at the
         * beginning of the line.
         */
        if (pending_newline) {
                rtas_call(display_character, 1, 1, NULL, '\r');
                rtas_call(display_character, 1, 1, NULL, '\n');
                pending_newline = 0;
        } else {
                rtas_call(display_character, 1, 1, NULL, '\r');
        }
 
        width = max_width;
        os = s;
        while (*os) {
                if (*os == '\n' || *os == '\r') {
                        /* Blank to end of line. */
                        while (width-- > 0)
                                rtas_call(display_character, 1, 1, NULL, ' ');
 
                        /* If newline is the last character, save it
                         * until next call to avoid bumping up the
                         * display output.
                         */
                        if (*os == '\n' && !os[1]) {
                                pending_newline = 1;
                                spin_unlock(&progress_lock);
                                return;
                        }
 
                        /* RTAS wants CR-LF, not just LF */
 
                        if (*os == '\n') {
                                rtas_call(display_character, 1, 1, NULL, '\r');
                                rtas_call(display_character, 1, 1, NULL, '\n');
                        } else {
                                /* CR might be used to re-draw a line, so we'll
                                 * leave it alone and not add LF.
                                 */
                                rtas_call(display_character, 1, 1, NULL, *os);
                        }
 
                        width = max_width;
                } else {
                        width--;
                        rtas_call(display_character, 1, 1, NULL, *os);
                }
 
                os++;
 
                /* if we overwrite the screen length */
                if (width <= 0)
                        while ((*os != 0) && (*os != '\n') && (*os != '\r'))
                                os++;
        }
 
        /* Blank to end of line. */
        while (width-- > 0)
                rtas_call(display_character, 1, 1, NULL, ' ');

        spin_unlock(&progress_lock);
}

extern void setup_default_decr(void);

/* Some sane defaults: 125 MHz timebase, 1GHz processor */
#define DEFAULT_TB_FREQ         125000000UL
#define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)

static void __init pSeries_calibrate_decr(void)
{
        struct device_node *cpu;
        struct div_result divres;
        unsigned int *fp;
        int node_found;

        /*
         * The cpu node should have a timebase-frequency property
         * to tell us the rate at which the decrementer counts.
         */
        cpu = of_find_node_by_type(NULL, "cpu");

        ppc_tb_freq = DEFAULT_TB_FREQ;          /* hardcoded default */
        node_found = 0;
        if (cpu != 0) {
                fp = (unsigned int *)get_property(cpu, "timebase-frequency",
                                                  NULL);
                if (fp != 0) {
                        node_found = 1;
                        ppc_tb_freq = *fp;
                }
        }
        if (!node_found)
                printk(KERN_ERR "WARNING: Estimating decrementer frequency "
                                "(not found)\n");

        ppc_proc_freq = DEFAULT_PROC_FREQ;
        node_found = 0;
        if (cpu != 0) {
                fp = (unsigned int *)get_property(cpu, "clock-frequency",
                                                  NULL);
                if (fp != 0) {
                        node_found = 1;
                        ppc_proc_freq = *fp;
                }
        }
        if (!node_found)
                printk(KERN_ERR "WARNING: Estimating processor frequency "
                                "(not found)\n");

        of_node_put(cpu);

        printk(KERN_INFO "time_init: decrementer frequency = %lu.%.6lu MHz\n",
               ppc_tb_freq/1000000, ppc_tb_freq%1000000);
        printk(KERN_INFO "time_init: processor frequency   = %lu.%.6lu MHz\n",
               ppc_proc_freq/1000000, ppc_proc_freq%1000000);

        tb_ticks_per_jiffy = ppc_tb_freq / HZ;
        tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;
        tb_ticks_per_usec = ppc_tb_freq / 1000000;
        tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
        div128_by_32(1024*1024, 0, tb_ticks_per_sec, &divres);
        tb_to_xs = divres.result_low;

        setup_default_decr();
}

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;
}

struct machdep_calls __initdata pSeries_md = {
        .probe                  = pSeries_probe,
        .setup_arch             = pSeries_setup_arch,
        .init_early             = pSeries_init_early,
        .get_cpuinfo            = pSeries_get_cpuinfo,
        .log_error              = pSeries_log_error,
        .pcibios_fixup          = pSeries_final_fixup,
        .restart                = rtas_restart,
        .power_off              = rtas_power_off,
        .halt                   = rtas_halt,
        .panic                  = rtas_os_term,
        .cpu_die                = pSeries_mach_cpu_die,
        .get_boot_time          = pSeries_get_boot_time,
        .get_rtc_time           = pSeries_get_rtc_time,
        .set_rtc_time           = pSeries_set_rtc_time,
        .calibrate_decr         = pSeries_calibrate_decr,
        .progress               = pSeries_progress,
        .check_legacy_ioport    = pSeries_check_legacy_ioport,
        .system_reset_exception = pSeries_system_reset_exception,
        .machine_check_exception = pSeries_machine_check_exception,
};