pcic.c

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/*
 * pcic.c: MicroSPARC-IIep PCI controller support
 *
 * Copyright (C) 1998 V. Roganov and G. Raiko
 *
 * Code is derived from Ultra/PCI PSYCHO controller support, see that
 * for author info.
 *
 * Support for diverse IIep based platforms by Pete Zaitcev.
 * CP-1200 by Eric Brower.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/jiffies.h>

#include <asm/swift.h> /* for cache flushing. */
#include <asm/io.h>

#include <linux/ctype.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/interrupt.h>
#include <linux/export.h>

#include <asm/irq.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/pcic.h>
#include <asm/timex.h>
#include <asm/timer.h>
#include <asm/uaccess.h>
#include <asm/irq_regs.h>

#include "irq.h"

/*
 * I studied different documents and many live PROMs both from 2.30
 * family and 3.xx versions. I came to the amazing conclusion: there is
 * absolutely no way to route interrupts in IIep systems relying on
 * information which PROM presents. We must hardcode interrupt routing
 * schematics. And this actually sucks.   -- zaitcev 1999/05/12
 *
 * To find irq for a device we determine which routing map
 * is in effect or, in other words, on which machine we are running.
 * We use PROM name for this although other techniques may be used
 * in special cases (Gleb reports a PROMless IIep based system).
 * Once we know the map we take device configuration address and
 * find PCIC pin number where INT line goes. Then we may either program
 * preferred irq into the PCIC or supply the preexisting irq to the device.
 */
struct pcic_ca2irq {
    unsigned char busno;        /* PCI bus number */
    unsigned char devfn;        /* Configuration address */
    unsigned char pin;      /* PCIC external interrupt pin */
    unsigned char irq;      /* Preferred IRQ (mappable in PCIC) */
    unsigned int force;     /* Enforce preferred IRQ */
};

struct pcic_sn2list {
    char *sysname;
    struct pcic_ca2irq *intmap;
    int mapdim;
};

/*
 * JavaEngine-1 apparently has different versions.
 *
 * According to communications with Sun folks, for P2 build 501-4628-03:
 * pin 0 - parallel, audio;
 * pin 1 - Ethernet;
 * pin 2 - su;
 * pin 3 - PS/2 kbd and mouse.
 *
 * OEM manual (805-1486):
 * pin 0: Ethernet
 * pin 1: All EBus
 * pin 2: IGA (unused)
 * pin 3: Not connected
 * OEM manual says that 501-4628 & 501-4811 are the same thing,
 * only the latter has NAND flash in place.
 *
 * So far unofficial Sun wins over the OEM manual. Poor OEMs...
 */
static struct pcic_ca2irq pcic_i_je1a[] = { /* 501-4811-03 */
    { 0, 0x00, 2, 12, 0 },      /* EBus: hogs all */
    { 0, 0x01, 1,  6, 1 },      /* Happy Meal */
    { 0, 0x80, 0,  7, 0 },      /* IGA (unused) */
};

/* XXX JS-E entry is incomplete - PCI Slot 2 address (pin 7)? */
static struct pcic_ca2irq pcic_i_jse[] = {
    { 0, 0x00, 0, 13, 0 },      /* Ebus - serial and keyboard */
    { 0, 0x01, 1,  6, 0 },      /* hme */
    { 0, 0x08, 2,  9, 0 },      /* VGA - we hope not used :) */
    { 0, 0x10, 6,  8, 0 },      /* PCI INTA# in Slot 1 */
    { 0, 0x18, 7, 12, 0 },      /* PCI INTA# in Slot 2, shared w. RTC */
    { 0, 0x38, 4,  9, 0 },      /* All ISA devices. Read 8259. */
    { 0, 0x80, 5, 11, 0 },      /* EIDE */
    /* {0,0x88, 0,0,0} - unknown device... PMU? Probably no interrupt. */
    { 0, 0xA0, 4,  9, 0 },      /* USB */
    /*
     * Some pins belong to non-PCI devices, we hardcode them in drivers.
     * sun4m timers - irq 10, 14
     * PC style RTC - pin 7, irq 4 ?
     * Smart card, Parallel - pin 4 shared with USB, ISA
     * audio - pin 3, irq 5 ?
     */
};

/* SPARCengine-6 was the original release name of CP1200.
 * The documentation differs between the two versions
 */
static struct pcic_ca2irq pcic_i_se6[] = {
    { 0, 0x08, 0,  2, 0 },      /* SCSI */
    { 0, 0x01, 1,  6, 0 },      /* HME  */
    { 0, 0x00, 3, 13, 0 },      /* EBus */
};

/*
 * Krups (courtesy of Varol Kaptan)
 * No documentation available, but it was easy to guess
 * because it was very similar to Espresso.
 *  
 * pin 0 - kbd, mouse, serial;
 * pin 1 - Ethernet;
 * pin 2 - igs (we do not use it);
 * pin 3 - audio;
 * pin 4,5,6 - unused;
 * pin 7 - RTC (from P2 onwards as David B. says).
 */
static struct pcic_ca2irq pcic_i_jk[] = {
    { 0, 0x00, 0, 13, 0 },      /* Ebus - serial and keyboard */
    { 0, 0x01, 1,  6, 0 },      /* hme */
};

/*
 * Several entries in this list may point to the same routing map
 * as several PROMs may be installed on the same physical board.
 */
#define SN2L_INIT(name, map)    \
  { name, map, ARRAY_SIZE(map) }

static struct pcic_sn2list pcic_known_sysnames[] = {
    SN2L_INIT("SUNW,JavaEngine1", pcic_i_je1a), /* JE1, PROM 2.32 */
    SN2L_INIT("SUNW,JS-E", pcic_i_jse), /* PROLL JavaStation-E */
    SN2L_INIT("SUNW,SPARCengine-6", pcic_i_se6), /* SPARCengine-6/CP-1200 */
    SN2L_INIT("SUNW,JS-NC", pcic_i_jk), /* PROLL JavaStation-NC */
    SN2L_INIT("SUNW,JSIIep", pcic_i_jk),    /* OBP JavaStation-NC */
    { NULL, NULL, 0 }
};

/*
 * Only one PCIC per IIep,
 * and since we have no SMP IIep, only one per system.
 */
static int pcic0_up;
static struct linux_pcic pcic0;

void __iomem *pcic_regs;
volatile int pcic_speculative;
volatile int pcic_trapped;

/* forward */
unsigned int pcic_build_device_irq(struct platform_device *op,
                                   unsigned int real_irq);

#define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (((unsigned int)bus) << 16) | (((unsigned int)device_fn) << 8) | (where & ~3))

static int pcic_read_config_dword(unsigned int busno, unsigned int devfn,
    int where, u32 *value)
{
    struct linux_pcic *pcic;
    unsigned long flags;

    pcic = &pcic0;

    local_irq_save(flags);
#if 0 /* does not fail here */
    pcic_speculative = 1;
    pcic_trapped = 0;
#endif
    writel(CONFIG_CMD(busno, devfn, where), pcic->pcic_config_space_addr);
#if 0 /* does not fail here */
    nop();
    if (pcic_trapped) {
        local_irq_restore(flags);
        *value = ~0;
        return 0;
    }
#endif
    pcic_speculative = 2;
    pcic_trapped = 0;
    *value = readl(pcic->pcic_config_space_data + (where&4));
    nop();
    if (pcic_trapped) {
        pcic_speculative = 0;
        local_irq_restore(flags);
        *value = ~0;
        return 0;
    }
    pcic_speculative = 0;
    local_irq_restore(flags);
    return 0;
}

static int pcic_read_config(struct pci_bus *bus, unsigned int devfn,
   int where, int size, u32 *val)
{
    unsigned int v;

    if (bus->number != 0) return -EINVAL;
    switch (size) {
    case 1:
        pcic_read_config_dword(bus->number, devfn, where&~3, &v);
        *val = 0xff & (v >> (8*(where & 3)));
        return 0;
    case 2:
        if (where&1) return -EINVAL;
        pcic_read_config_dword(bus->number, devfn, where&~3, &v);
        *val = 0xffff & (v >> (8*(where & 3)));
        return 0;
    case 4:
        if (where&3) return -EINVAL;
        pcic_read_config_dword(bus->number, devfn, where&~3, val);
        return 0;
    }
    return -EINVAL;
}

static int pcic_write_config_dword(unsigned int busno, unsigned int devfn,
    int where, u32 value)
{
    struct linux_pcic *pcic;
    unsigned long flags;

    pcic = &pcic0;

    local_irq_save(flags);
    writel(CONFIG_CMD(busno, devfn, where), pcic->pcic_config_space_addr);
    writel(value, pcic->pcic_config_space_data + (where&4));
    local_irq_restore(flags);
    return 0;
}

static int pcic_write_config(struct pci_bus *bus, unsigned int devfn,
   int where, int size, u32 val)
{
    unsigned int v;

    if (bus->number != 0) return -EINVAL;
    switch (size) {
    case 1:
        pcic_read_config_dword(bus->number, devfn, where&~3, &v);
        v = (v & ~(0xff << (8*(where&3)))) |
            ((0xff&val) << (8*(where&3)));
        return pcic_write_config_dword(bus->number, devfn, where&~3, v);
    case 2:
        if (where&1) return -EINVAL;
        pcic_read_config_dword(bus->number, devfn, where&~3, &v);
        v = (v & ~(0xffff << (8*(where&3)))) |
            ((0xffff&val) << (8*(where&3)));
        return pcic_write_config_dword(bus->number, devfn, where&~3, v);
    case 4:
        if (where&3) return -EINVAL;
        return pcic_write_config_dword(bus->number, devfn, where, val);
    }
    return -EINVAL;
}

static struct pci_ops pcic_ops = {
    .read =     pcic_read_config,
    .write =    pcic_write_config,
};

/*
 * On sparc64 pcibios_init() calls pci_controller_probe().
 * We want PCIC probed little ahead so that interrupt controller
 * would be operational.
 */
int __init pcic_probe(void)
{
    struct linux_pcic *pcic;
    struct linux_prom_registers regs[PROMREG_MAX];
    struct linux_pbm_info* pbm;
    char namebuf[64];
    phandle node;
    int err;

    if (pcic0_up) {
        prom_printf("PCIC: called twice!\n");
        prom_halt();
    }
    pcic = &pcic0;

    node = prom_getchild (prom_root_node);
    node = prom_searchsiblings (node, "pci");
    if (node == 0)
        return -ENODEV;
    /*
     * Map in PCIC register set, config space, and IO base
     */
    err = prom_getproperty(node, "reg", (char*)regs, sizeof(regs));
    if (err == 0 || err == -1) {
        prom_printf("PCIC: Error, cannot get PCIC registers "
                "from PROM.\n");
        prom_halt();
    }

    pcic0_up = 1;

    pcic->pcic_res_regs.name = "pcic_registers";
    pcic->pcic_regs = ioremap(regs[0].phys_addr, regs[0].reg_size);
    if (!pcic->pcic_regs) {
        prom_printf("PCIC: Error, cannot map PCIC registers.\n");
        prom_halt();
    }

    pcic->pcic_res_io.name = "pcic_io";
    if ((pcic->pcic_io = (unsigned long)
        ioremap(regs[1].phys_addr, 0x10000)) == 0) {
        prom_printf("PCIC: Error, cannot map PCIC IO Base.\n");
        prom_halt();
    }

    pcic->pcic_res_cfg_addr.name = "pcic_cfg_addr";
    if ((pcic->pcic_config_space_addr =
        ioremap(regs[2].phys_addr, regs[2].reg_size * 2)) == 0) {
        prom_printf("PCIC: Error, cannot map "
                "PCI Configuration Space Address.\n");
        prom_halt();
    }

    /*
     * Docs say three least significant bits in address and data
     * must be the same. Thus, we need adjust size of data.
     */
    pcic->pcic_res_cfg_data.name = "pcic_cfg_data";
    if ((pcic->pcic_config_space_data =
        ioremap(regs[3].phys_addr, regs[3].reg_size * 2)) == 0) {
        prom_printf("PCIC: Error, cannot map "
                "PCI Configuration Space Data.\n");
        prom_halt();
    }

    pbm = &pcic->pbm;
    pbm->prom_node = node;
    prom_getstring(node, "name", namebuf, 63);  namebuf[63] = 0;
    strcpy(pbm->prom_name, namebuf);

    {
        extern volatile int t_nmi[4];
        extern int pcic_nmi_trap_patch[4];

        t_nmi[0] = pcic_nmi_trap_patch[0];
        t_nmi[1] = pcic_nmi_trap_patch[1];
        t_nmi[2] = pcic_nmi_trap_patch[2];
        t_nmi[3] = pcic_nmi_trap_patch[3];
        swift_flush_dcache();
        pcic_regs = pcic->pcic_regs;
    }

    prom_getstring(prom_root_node, "name", namebuf, 63);  namebuf[63] = 0;
    {
        struct pcic_sn2list *p;

        for (p = pcic_known_sysnames; p->sysname != NULL; p++) {
            if (strcmp(namebuf, p->sysname) == 0)
                break;
        }
        pcic->pcic_imap = p->intmap;
        pcic->pcic_imdim = p->mapdim;
    }
    if (pcic->pcic_imap == NULL) {
        /*
         * We do not panic here for the sake of embedded systems.
         */
        printk("PCIC: System %s is unknown, cannot route interrupts\n",
            namebuf);
    }

    return 0;
}

static void __init pcic_pbm_scan_bus(struct linux_pcic *pcic)
{
    struct linux_pbm_info *pbm = &pcic->pbm;

    pbm->pci_bus = pci_scan_bus(pbm->pci_first_busno, &pcic_ops, pbm);
#if 0 /* deadwood transplanted from sparc64 */
    pci_fill_in_pbm_cookies(pbm->pci_bus, pbm, pbm->prom_node);
    pci_record_assignments(pbm, pbm->pci_bus);
    pci_assign_unassigned(pbm, pbm->pci_bus);
    pci_fixup_irq(pbm, pbm->pci_bus);
#endif
}

/*
 * Main entry point from the PCI subsystem.
 */
static int __init pcic_init(void)
{
    struct linux_pcic *pcic;

    /*
     * PCIC should be initialized at start of the timer.
     * So, here we report the presence of PCIC and do some magic passes.
     */
    if(!pcic0_up)
        return 0;
    pcic = &pcic0;

    /*
     *      Switch off IOTLB translation.
     */
    writeb(PCI_DVMA_CONTROL_IOTLB_DISABLE, 
           pcic->pcic_regs+PCI_DVMA_CONTROL);

    /*
     *      Increase mapped size for PCI memory space (DMA access).
     *      Should be done in that order (size first, address second).
     *      Why we couldn't set up 4GB and forget about it? XXX
     */
    writel(0xF0000000UL, pcic->pcic_regs+PCI_SIZE_0);
    writel(0+PCI_BASE_ADDRESS_SPACE_MEMORY, 
           pcic->pcic_regs+PCI_BASE_ADDRESS_0);

    pcic_pbm_scan_bus(pcic);

    return 0;
}

int pcic_present(void)
{
    return pcic0_up;
}

static int __devinit pdev_to_pnode(struct linux_pbm_info *pbm,
                    struct pci_dev *pdev)
{
    struct linux_prom_pci_registers regs[PROMREG_MAX];
    int err;
    phandle node = prom_getchild(pbm->prom_node);

    while(node) {
        err = prom_getproperty(node, "reg", 
                       (char *)&regs[0], sizeof(regs));
        if(err != 0 && err != -1) {
            unsigned long devfn = (regs[0].which_io >> 8) & 0xff;
            if(devfn == pdev->devfn)
                return node;
        }
        node = prom_getsibling(node);
    }
    return 0;
}

static inline struct pcidev_cookie *pci_devcookie_alloc(void)
{
    return kmalloc(sizeof(struct pcidev_cookie), GFP_ATOMIC);
}

static void pcic_map_pci_device(struct linux_pcic *pcic,
    struct pci_dev *dev, int node)
{
    char namebuf[64];
    unsigned long address;
    unsigned long flags;
    int j;

    if (node == 0 || node == -1) {
        strcpy(namebuf, "???");
    } else {
        prom_getstring(node, "name", namebuf, 63); namebuf[63] = 0;
    }

    for (j = 0; j < 6; j++) {
        address = dev->resource[j].start;
        if (address == 0) break;    /* are sequential */
        flags = dev->resource[j].flags;
        if ((flags & IORESOURCE_IO) != 0) {
            if (address < 0x10000) {
                /*
                 * A device responds to I/O cycles on PCI.
                 * We generate these cycles with memory
                 * access into the fixed map (phys 0x30000000).
                 *
                 * Since a device driver does not want to
                 * do ioremap() before accessing PC-style I/O,
                 * we supply virtual, ready to access address.
                 *
                 * Note that request_region()
                 * works for these devices.
                 *
                 * XXX Neat trick, but it's a *bad* idea
                 * to shit into regions like that.
                 * What if we want to allocate one more
                 * PCI base address...
                 */
                dev->resource[j].start =
                    pcic->pcic_io + address;
                dev->resource[j].end = 1;  /* XXX */
                dev->resource[j].flags =
                    (flags & ~IORESOURCE_IO) | IORESOURCE_MEM;
            } else {
                /*
                 * OOPS... PCI Spec allows this. Sun does
                 * not have any devices getting above 64K
                 * so it must be user with a weird I/O
                 * board in a PCI slot. We must remap it
                 * under 64K but it is not done yet. XXX
                 */
                printk("PCIC: Skipping I/O space at 0x%lx, "
                    "this will Oops if a driver attaches "
                    "device '%s' at %02x:%02x)\n", address,
                    namebuf, dev->bus->number, dev->devfn);
            }
        }
    }
}

static void
pcic_fill_irq(struct linux_pcic *pcic, struct pci_dev *dev, int node)
{
    struct pcic_ca2irq *p;
    unsigned int real_irq;
    int i, ivec;
    char namebuf[64];

    if (node == 0 || node == -1) {
        strcpy(namebuf, "???");
    } else {
        prom_getstring(node, "name", namebuf, sizeof(namebuf));
    }

    if ((p = pcic->pcic_imap) == 0) {
        dev->irq = 0;
        return;
    }
    for (i = 0; i < pcic->pcic_imdim; i++) {
        if (p->busno == dev->bus->number && p->devfn == dev->devfn)
            break;
        p++;
    }
    if (i >= pcic->pcic_imdim) {
        printk("PCIC: device %s devfn %02x:%02x not found in %d\n",
            namebuf, dev->bus->number, dev->devfn, pcic->pcic_imdim);
        dev->irq = 0;
        return;
    }

    i = p->pin;
    if (i >= 0 && i < 4) {
        ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_LO);
        real_irq = ivec >> (i << 2) & 0xF;
    } else if (i >= 4 && i < 8) {
        ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_HI);
        real_irq = ivec >> ((i-4) << 2) & 0xF;
    } else {                    /* Corrupted map */
        printk("PCIC: BAD PIN %d\n", i); for (;;) {}
    }
/* P3 */ /* printk("PCIC: device %s pin %d ivec 0x%x irq %x\n", namebuf, i, ivec, dev->irq); */

    /* real_irq means PROM did not bother to program the upper
     * half of PCIC. This happens on JS-E with PROM 3.11, for instance.
     */
    if (real_irq == 0 || p->force) {
        if (p->irq == 0 || p->irq >= 15) {  /* Corrupted map */
            printk("PCIC: BAD IRQ %d\n", p->irq); for (;;) {}
        }
        printk("PCIC: setting irq %d at pin %d for device %02x:%02x\n",
            p->irq, p->pin, dev->bus->number, dev->devfn);
        real_irq = p->irq;

        i = p->pin;
        if (i >= 4) {
            ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_HI);
            ivec &= ~(0xF << ((i - 4) << 2));
            ivec |= p->irq << ((i - 4) << 2);
            writew(ivec, pcic->pcic_regs+PCI_INT_SELECT_HI);
        } else {
            ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_LO);
            ivec &= ~(0xF << (i << 2));
            ivec |= p->irq << (i << 2);
            writew(ivec, pcic->pcic_regs+PCI_INT_SELECT_LO);
        }
    }
    dev->irq = pcic_build_device_irq(NULL, real_irq);
}

/*
 * Normally called from {do_}pci_scan_bus...
 */
void __devinit pcibios_fixup_bus(struct pci_bus *bus)
{
    struct pci_dev *dev;
    int i, has_io, has_mem;
    unsigned int cmd;
    struct linux_pcic *pcic;
    /* struct linux_pbm_info* pbm = &pcic->pbm; */
    int node;
    struct pcidev_cookie *pcp;

    if (!pcic0_up) {
        printk("pcibios_fixup_bus: no PCIC\n");
        return;
    }
    pcic = &pcic0;

    /*
     * Next crud is an equivalent of pbm = pcic_bus_to_pbm(bus);
     */
    if (bus->number != 0) {
        printk("pcibios_fixup_bus: nonzero bus 0x%x\n", bus->number);
        return;
    }

    list_for_each_entry(dev, &bus->devices, bus_list) {

        /*
         * Comment from i386 branch:
         *     There are buggy BIOSes that forget to enable I/O and memory
         *     access to PCI devices. We try to fix this, but we need to
         *     be sure that the BIOS didn't forget to assign an address
         *     to the device. [mj]
         * OBP is a case of such BIOS :-)
         */
        has_io = has_mem = 0;
        for(i=0; i<6; i++) {
            unsigned long f = dev->resource[i].flags;
            if (f & IORESOURCE_IO) {
                has_io = 1;
            } else if (f & IORESOURCE_MEM)
                has_mem = 1;
        }
        pcic_read_config(dev->bus, dev->devfn, PCI_COMMAND, 2, &cmd);
        if (has_io && !(cmd & PCI_COMMAND_IO)) {
            printk("PCIC: Enabling I/O for device %02x:%02x\n",
                dev->bus->number, dev->devfn);
            cmd |= PCI_COMMAND_IO;
            pcic_write_config(dev->bus, dev->devfn,
                PCI_COMMAND, 2, cmd);
        }
        if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
            printk("PCIC: Enabling memory for device %02x:%02x\n",
                dev->bus->number, dev->devfn);
            cmd |= PCI_COMMAND_MEMORY;
            pcic_write_config(dev->bus, dev->devfn,
                PCI_COMMAND, 2, cmd);
        }

        node = pdev_to_pnode(&pcic->pbm, dev);
        if(node == 0)
            node = -1;

        /* cookies */
        pcp = pci_devcookie_alloc();
        pcp->pbm = &pcic->pbm;
        pcp->prom_node = of_find_node_by_phandle(node);
        dev->sysdata = pcp;

        /* fixing I/O to look like memory */
        if ((dev->class>>16) != PCI_BASE_CLASS_BRIDGE)
            pcic_map_pci_device(pcic, dev, node);

        pcic_fill_irq(pcic, dev, node);
    }
}

/*
 * pcic_pin_to_irq() is exported to bus probing code
 */
unsigned int
pcic_pin_to_irq(unsigned int pin, const char *name)
{
    struct linux_pcic *pcic = &pcic0;
    unsigned int irq;
    unsigned int ivec;

    if (pin < 4) {
        ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_LO);
        irq = ivec >> (pin << 2) & 0xF;
    } else if (pin < 8) {
        ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_HI);
        irq = ivec >> ((pin-4) << 2) & 0xF;
    } else {                    /* Corrupted map */
        printk("PCIC: BAD PIN %d FOR %s\n", pin, name);
        for (;;) {} /* XXX Cannot panic properly in case of PROLL */
    }
/* P3 */ /* printk("PCIC: dev %s pin %d ivec 0x%x irq %x\n", name, pin, ivec, irq); */
    return irq;
}

/* Makes compiler happy */
static volatile int pcic_timer_dummy;

static void pcic_clear_clock_irq(void)
{
    pcic_timer_dummy = readl(pcic0.pcic_regs+PCI_SYS_LIMIT);
}

/* CPU frequency is 100 MHz, timer increments every 4 CPU clocks */
#define USECS_PER_JIFFY  (1000000 / HZ)
#define TICK_TIMER_LIMIT ((100 * 1000000 / 4) / HZ)

static unsigned int pcic_cycles_offset(void)
{
    u32 value, count;

    value = readl(pcic0.pcic_regs + PCI_SYS_COUNTER);
    count = value & ~PCI_SYS_COUNTER_OVERFLOW;

    if (value & PCI_SYS_COUNTER_OVERFLOW)
        count += TICK_TIMER_LIMIT;
    /*
     * We divide all by HZ
     * to have microsecond resolution and to avoid overflow
     */
    count = ((count / HZ) * USECS_PER_JIFFY) / (TICK_TIMER_LIMIT / HZ);

    /* Coordinate with the sparc_config.clock_rate setting */
    return count * 2;
}

void __init pci_time_init(void)
{
    struct linux_pcic *pcic = &pcic0;
    unsigned long v;
    int timer_irq, irq;
    int err;

#ifndef CONFIG_SMP
    /*
     * The clock_rate is in SBUS dimension.
     * We take into account this in pcic_cycles_offset()
     */
    sparc_config.clock_rate = SBUS_CLOCK_RATE / HZ;
    sparc_config.features |= FEAT_L10_CLOCKEVENT;
#endif
    sparc_config.features |= FEAT_L10_CLOCKSOURCE;
    sparc_config.get_cycles_offset = pcic_cycles_offset;

    writel (TICK_TIMER_LIMIT, pcic->pcic_regs+PCI_SYS_LIMIT);
    /* PROM should set appropriate irq */
    v = readb(pcic->pcic_regs+PCI_COUNTER_IRQ);
    timer_irq = PCI_COUNTER_IRQ_SYS(v);
    writel (PCI_COUNTER_IRQ_SET(timer_irq, 0),
        pcic->pcic_regs+PCI_COUNTER_IRQ);
    irq = pcic_build_device_irq(NULL, timer_irq);
    err = request_irq(irq, timer_interrupt,
              IRQF_TIMER, "timer", NULL);
    if (err) {
        prom_printf("time_init: unable to attach IRQ%d\n", timer_irq);
        prom_halt();
    }
    local_irq_enable();
}


#if 0
static void watchdog_reset() {
    writeb(0, pcic->pcic_regs+PCI_SYS_STATUS);
}
#endif

resource_size_t pcibios_align_resource(void *data, const struct resource *res,
                resource_size_t size, resource_size_t align)
{
    return res->start;
}

int pcibios_enable_device(struct pci_dev *pdev, int mask)
{
    return 0;
}

/*
 * NMI
 */
void pcic_nmi(unsigned int pend, struct pt_regs *regs)
{

    pend = flip_dword(pend);

    if (!pcic_speculative || (pend & PCI_SYS_INT_PENDING_PIO) == 0) {
        /*
         * XXX On CP-1200 PCI #SERR may happen, we do not know
         * what to do about it yet.
         */
        printk("Aiee, NMI pend 0x%x pc 0x%x spec %d, hanging\n",
            pend, (int)regs->pc, pcic_speculative);
        for (;;) { }
    }
    pcic_speculative = 0;
    pcic_trapped = 1;
    regs->pc = regs->npc;
    regs->npc += 4;
}

static inline unsigned long get_irqmask(int irq_nr)
{
    return 1 << irq_nr;
}

static void pcic_mask_irq(struct irq_data *data)
{
    unsigned long mask, flags;

    mask = (unsigned long)data->chip_data;
    local_irq_save(flags);
    writel(mask, pcic0.pcic_regs+PCI_SYS_INT_TARGET_MASK_SET);
    local_irq_restore(flags);
}

static void pcic_unmask_irq(struct irq_data *data)
{
    unsigned long mask, flags;

    mask = (unsigned long)data->chip_data;
    local_irq_save(flags);
    writel(mask, pcic0.pcic_regs+PCI_SYS_INT_TARGET_MASK_CLEAR);
    local_irq_restore(flags);
}

static unsigned int pcic_startup_irq(struct irq_data *data)
{
    irq_link(data->irq);
    pcic_unmask_irq(data);
    return 0;
}

static struct irq_chip pcic_irq = {
    .name       = "pcic",
    .irq_startup    = pcic_startup_irq,
    .irq_mask   = pcic_mask_irq,
    .irq_unmask = pcic_unmask_irq,
};

unsigned int pcic_build_device_irq(struct platform_device *op,
                                   unsigned int real_irq)
{
    unsigned int irq;
    unsigned long mask;

    irq = 0;
    mask = get_irqmask(real_irq);
    if (mask == 0)
        goto out;

    irq = irq_alloc(real_irq, real_irq);
    if (irq == 0)
        goto out;

    irq_set_chip_and_handler_name(irq, &pcic_irq,
                                  handle_level_irq, "PCIC");
    irq_set_chip_data(irq, (void *)mask);

out:
    return irq;
}


static void pcic_load_profile_irq(int cpu, unsigned int limit)
{
    printk("PCIC: unimplemented code: FILE=%s LINE=%d", __FILE__, __LINE__);
}

void __init sun4m_pci_init_IRQ(void)
{
    sparc_config.build_device_irq = pcic_build_device_irq;
    sparc_config.clear_clock_irq  = pcic_clear_clock_irq;
    sparc_config.load_profile_irq = pcic_load_profile_irq;
}

/*
 * This probably belongs here rather than ioport.c because
 * we do not want this crud linked into SBus kernels.
 * Also, think for a moment about likes of floppy.c that
 * include architecture specific parts. They may want to redefine ins/outs.
 *
 * We do not use horrible macros here because we want to
 * advance pointer by sizeof(size).
 */
void outsb(unsigned long addr, const void *src, unsigned long count)
{
    while (count) {
        count -= 1;
        outb(*(const char *)src, addr);
        src += 1;
        /* addr += 1; */
    }
}
EXPORT_SYMBOL(outsb);

void outsw(unsigned long addr, const void *src, unsigned long count)
{
    while (count) {
        count -= 2;
        outw(*(const short *)src, addr);
        src += 2;
        /* addr += 2; */
    }
}
EXPORT_SYMBOL(outsw);

void outsl(unsigned long addr, const void *src, unsigned long count)
{
    while (count) {
        count -= 4;
        outl(*(const long *)src, addr);
        src += 4;
        /* addr += 4; */
    }
}
EXPORT_SYMBOL(outsl);

void insb(unsigned long addr, void *dst, unsigned long count)
{
    while (count) {
        count -= 1;
        *(unsigned char *)dst = inb(addr);
        dst += 1;
        /* addr += 1; */
    }
}
EXPORT_SYMBOL(insb);

void insw(unsigned long addr, void *dst, unsigned long count)
{
    while (count) {
        count -= 2;
        *(unsigned short *)dst = inw(addr);
        dst += 2;
        /* addr += 2; */
    }
}
EXPORT_SYMBOL(insw);

void insl(unsigned long addr, void *dst, unsigned long count)
{
    while (count) {
        count -= 4;
        /*
         * XXX I am sure we are in for an unaligned trap here.
         */
        *(unsigned long *)dst = inl(addr);
        dst += 4;
        /* addr += 4; */
    }
}
EXPORT_SYMBOL(insl);

subsys_initcall(pcic_init);