More Makefile cleanups, otherwise mainly noticeable are the netfilter fix

[davej-history.git] / arch / ppc / kernel / pmac_pic.c

#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/pci.h>
#include <linux/openpic.h>

#include <asm/init.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include "pmac_pic.h"

/* pmac */struct pmac_irq_hw {
        unsigned int    flag;
        unsigned int    enable;
        unsigned int    ack;
        unsigned int    level;
};

/* XXX these addresses should be obtained from the device tree */
static volatile struct pmac_irq_hw *pmac_irq_hw[4] = {
        (struct pmac_irq_hw *) 0xf3000020,
        (struct pmac_irq_hw *) 0xf3000010,
        (struct pmac_irq_hw *) 0xf4000020,
        (struct pmac_irq_hw *) 0xf4000010,
};

static int max_irqs;
static int max_real_irqs;
static int has_openpic = 0;

#define GATWICK_IRQ_POOL_SIZE        10
static struct interrupt_info gatwick_int_pool[GATWICK_IRQ_POOL_SIZE];

extern int pmac_pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
                                      unsigned char offset, unsigned short *val);
extern int pmac_pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
                                      unsigned char offset, unsigned short val);

/*
 * Mark an irq as "lost".  This is only used on the pmac
 * since it can lose interrupts (see pmac_set_irq_mask).
 * -- Cort
 */
void __pmac __no_use_set_lost(unsigned long irq_nr)
{
        if (!test_and_set_bit(irq_nr, ppc_lost_interrupts))
                atomic_inc(&ppc_n_lost_interrupts);
}

static void pmac_openpic_mask_irq(unsigned int irq_nr)
{
        openpic_disable_irq(irq_nr);
}

static void pmac_openpic_unmask_irq(unsigned int irq_nr)
{
        openpic_enable_irq(irq_nr);
}

static void pmac_openpic_ack_irq(unsigned int irq_nr)
{
        if ((irq_desc[irq_nr].status & IRQ_LEVEL) == 0)
                openpic_eoi(smp_processor_id());
        openpic_disable_irq(irq_nr);
}

static void pmac_openpic_end_irq(unsigned int irq_nr)
{
        if ((irq_desc[irq_nr].status & IRQ_LEVEL) != 0)
                openpic_eoi(smp_processor_id());
        openpic_enable_irq(irq_nr);
}

struct hw_interrupt_type pmac_open_pic = {
        " OpenPIC  ",
        NULL,
        NULL,
        pmac_openpic_unmask_irq,
        pmac_openpic_mask_irq,
        /* Theorically, the mask&ack should be NULL for OpenPIC. However, doing
         * so shows tons of bogus interrupts coming in.
         */
        pmac_openpic_ack_irq,
        pmac_openpic_end_irq,
        NULL
};

static void __pmac pmac_mask_and_ack_irq(unsigned int irq_nr)
{
        unsigned long bit = 1UL << (irq_nr & 0x1f);
        int i = irq_nr >> 5;

        if ((unsigned)irq_nr >= max_irqs)
                return;

        clear_bit(irq_nr, ppc_cached_irq_mask);
        if (test_and_clear_bit(irq_nr, ppc_lost_interrupts))
                atomic_dec(&ppc_n_lost_interrupts);
        out_le32(&pmac_irq_hw[i]->ack, bit);
        out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
        out_le32(&pmac_irq_hw[i]->ack, bit);
        do {
                /* make sure ack gets to controller before we enable
                   interrupts */
                mb();
        } while(in_le32(&pmac_irq_hw[i]->flag) & bit);
}

static void __pmac pmac_set_irq_mask(unsigned int irq_nr)
{
        unsigned long bit = 1UL << (irq_nr & 0x1f);
        int i = irq_nr >> 5;

        if ((unsigned)irq_nr >= max_irqs)
                return;

        /* enable unmasked interrupts */
        out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);

        do {
                /* make sure mask gets to controller before we
                   return to user */
                mb();
        } while((in_le32(&pmac_irq_hw[i]->enable) & bit)
                != (ppc_cached_irq_mask[i] & bit));

        /*
         * Unfortunately, setting the bit in the enable register
         * when the device interrupt is already on *doesn't* set
         * the bit in the flag register or request another interrupt.
         */
        if ((bit & ppc_cached_irq_mask[i])
            && (ld_le32(&pmac_irq_hw[i]->level) & bit)
            && !(ld_le32(&pmac_irq_hw[i]->flag) & bit))
                __set_lost((ulong)irq_nr);
}

static void __pmac pmac_mask_irq(unsigned int irq_nr)
{
        clear_bit(irq_nr, ppc_cached_irq_mask);
        pmac_set_irq_mask(irq_nr);
        mb();
}

static void __pmac pmac_unmask_irq(unsigned int irq_nr)
{
        set_bit(irq_nr, ppc_cached_irq_mask);
        pmac_set_irq_mask(irq_nr);
}

struct hw_interrupt_type pmac_pic = {
        " PMAC-PIC ",
        NULL,
        NULL,
        pmac_unmask_irq,
        pmac_mask_irq,
        pmac_mask_and_ack_irq,
        pmac_unmask_irq,
        NULL
};

struct hw_interrupt_type gatwick_pic = {
        " GATWICK  ",
        NULL,
        NULL,
        pmac_unmask_irq,
        pmac_mask_irq,
        pmac_mask_and_ack_irq,
        pmac_unmask_irq,
        NULL
};

static void gatwick_action(int cpl, void *dev_id, struct pt_regs *regs)
{
        int irq, bits;
        
        for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {
                int i = irq >> 5;
                bits = ld_le32(&pmac_irq_hw[i]->flag)
                        | ppc_lost_interrupts[i];
                if (bits == 0)
                        continue;
                irq += __ilog2(bits);
                break;
        }
        /* The previous version of this code allowed for this case, we
         * don't.  Put this here to check for it.
         * -- Cort
         */
        if ( irq_desc[irq].handler != &gatwick_pic )
                printk("gatwick irq not from gatwick pic\n");
        else
                ppc_irq_dispatch_handler( regs, irq );
}

int
pmac_get_irq(struct pt_regs *regs)
{
        int irq;
        unsigned long bits = 0;

#ifdef CONFIG_SMP
        void pmac_smp_message_recv(struct pt_regs *);
        
        /* IPI's are a hack on the powersurge -- Cort */
        if ( smp_processor_id() != 0 )
        {
                pmac_smp_message_recv(regs);
                return -2;      /* ignore, already handled */
        }
#endif /* CONFIG_SMP */

        if (has_openpic) {
                irq = openpic_irq(smp_processor_id());
                if (irq == OPENPIC_VEC_SPURIOUS)
                        /* We get those when doing polled ADB requests,
                         * using -2 is a temp hack to disable the printk
                         */
                        irq = -2; /*-1; */
        }
        else
        {
                for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
                        int i = irq >> 5;
                        bits = ld_le32(&pmac_irq_hw[i]->flag)
                                | ppc_lost_interrupts[i];
                        if (bits == 0)
                                continue;
                        irq += __ilog2(bits);
                        break;
                }
        }

        return irq;
}

/* This routine will fix some missing interrupt values in the device tree
 * on the gatwick mac-io controller used by some PowerBooks
 */
static void __init
pmac_fix_gatwick_interrupts(struct device_node *gw, int irq_base)
{
        struct device_node *node;
        int count;
        
        memset(gatwick_int_pool, 0, sizeof(gatwick_int_pool));
        node = gw->child;
        count = 0;
        while(node)
        {
                /* Fix SCC */
                if (strcasecmp(node->name, "escc") == 0)
                        if (node->child) {
                                if (node->child->n_intrs < 3) {
                                        node->child->intrs = &gatwick_int_pool[count];
                                        count += 3;
                                }
                                node->child->n_intrs = 3;                               
                                node->child->intrs[0].line = 15+irq_base;
                                node->child->intrs[1].line =  4+irq_base;
                                node->child->intrs[2].line =  5+irq_base;
                                printk(KERN_INFO "irq: fixed SCC on second controller (%d,%d,%d)\n",
                                        node->child->intrs[0].line,
                                        node->child->intrs[1].line,
                                        node->child->intrs[2].line);
                        }
                /* Fix media-bay & left SWIM */
                if (strcasecmp(node->name, "media-bay") == 0) {
                        struct device_node* ya_node;

                        if (node->n_intrs == 0)
                                node->intrs = &gatwick_int_pool[count++];
                        node->n_intrs = 1;
                        node->intrs[0].line = 29+irq_base;
                        printk(KERN_INFO "irq: fixed media-bay on second controller (%d)\n",
                                        node->intrs[0].line);
                        
                        ya_node = node->child;
                        while(ya_node)
                        {
                                if (strcasecmp(ya_node->name, "floppy") == 0) {
                                        if (ya_node->n_intrs < 2) {
                                                ya_node->intrs = &gatwick_int_pool[count];
                                                count += 2;
                                        }
                                        ya_node->n_intrs = 2;
                                        ya_node->intrs[0].line = 19+irq_base;
                                        ya_node->intrs[1].line =  1+irq_base;
                                        printk(KERN_INFO "irq: fixed floppy on second controller (%d,%d)\n",
                                                ya_node->intrs[0].line, ya_node->intrs[1].line);
                                } 
                                if (strcasecmp(ya_node->name, "ata4") == 0) {
                                        if (ya_node->n_intrs < 2) {
                                                ya_node->intrs = &gatwick_int_pool[count];
                                                count += 2;
                                        }
                                        ya_node->n_intrs = 2;
                                        ya_node->intrs[0].line = 14+irq_base;
                                        ya_node->intrs[1].line =  3+irq_base;
                                        printk(KERN_INFO "irq: fixed ide on second controller (%d,%d)\n",
                                                ya_node->intrs[0].line, ya_node->intrs[1].line);
                                } 
                                ya_node = ya_node->sibling;
                        }
                }
                node = node->sibling;
        }
        if (count > 10) {
                printk("WARNING !! Gatwick interrupt pool overflow\n");
                printk("  GATWICK_IRQ_POOL_SIZE = %d\n", GATWICK_IRQ_POOL_SIZE);
                printk("              requested = %d\n", count);
        }
}

/*
 * The PowerBook 3400/2400/3500 can have a combo ethernet/modem
 * card which includes an ohare chip that acts as a second interrupt
 * controller.  If we find this second ohare, set it up and fix the
 * interrupt value in the device tree for the ethernet chip.
 */
static void __init enable_second_ohare(void)
{
        unsigned char bus, devfn;
        unsigned short cmd;
        unsigned long addr;
        int second_irq;
        struct device_node *irqctrler = find_devices("pci106b,7");
        struct device_node *ether;

        if (irqctrler == NULL || irqctrler->n_addrs <= 0)
                return;
        addr = (unsigned long) ioremap(irqctrler->addrs[0].address, 0x40);
        pmac_irq_hw[1] = (volatile struct pmac_irq_hw *)(addr + 0x20);
        max_irqs = 64;
        if (pci_device_loc(irqctrler, &bus, &devfn) == 0) {
                pmac_pcibios_read_config_word(bus, devfn, PCI_COMMAND, &cmd);
                cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
                cmd &= ~PCI_COMMAND_IO;
                pmac_pcibios_write_config_word(bus, devfn, PCI_COMMAND, cmd);
        }

        second_irq = irqctrler->intrs[0].line;
        printk(KERN_INFO "irq: secondary controller on irq %d\n", second_irq);
        request_irq(second_irq, gatwick_action, SA_INTERRUPT,
                    "interrupt cascade", 0 );

        /* Fix interrupt for the modem/ethernet combo controller. The number
           in the device tree (27) is bogus (correct for the ethernet-only
           board but not the combo ethernet/modem board).
           The real interrupt is 28 on the second controller -> 28+32 = 60.
        */
        ether = find_devices("pci1011,14");
        if (ether && ether->n_intrs > 0) {
                ether->intrs[0].line = 60;
                printk(KERN_INFO "irq: Fixed ethernet IRQ to %d\n",
                       ether->intrs[0].line);
        }
}

void __init
pmac_pic_init(void)
{
        int i;
        struct device_node *irqctrler;
        unsigned long addr;
        int second_irq = -999;

        /* We first try to detect Apple's new Core99 chipset, since mac-io
         * is quite different on those machines and contains an IBM MPIC2.
         */
        irqctrler = find_type_devices("open-pic");
        if (irqctrler != NULL)
        {
                printk("PowerMac using OpenPIC irq controller\n");
                if (irqctrler->n_addrs > 0)
                {
#ifdef CONFIG_XMON
                        struct device_node* pswitch;
#endif /* CONFIG_XMON */        
                        OpenPIC = (volatile struct OpenPIC *)
                                ioremap(irqctrler->addrs[0].address,
                                        irqctrler->addrs[0].size);
                        for ( i = 0 ; i < NR_IRQS ; i++ )
                                irq_desc[i].handler = &pmac_open_pic;
                        openpic_init(1);
                        has_openpic = 1;
#ifdef CONFIG_XMON
                        pswitch = find_devices("programmer-switch");
                        if (pswitch && pswitch->n_intrs)
                                request_irq(pswitch->intrs[0].line, xmon_irq, 0,
                                            "NMI - XMON", 0);
#endif  /* CONFIG_XMON */
                        return;
                }
                irqctrler = NULL;
        }

        int_control.int_set_lost = __no_use_set_lost;
        /*
         * G3 powermacs and 1999 G3 PowerBooks have 64 interrupts,
         * 1998 G3 Series PowerBooks have 128, 
         * other powermacs have 32.
         * The combo ethernet/modem card for the Powerstar powerbooks
         * (2400/3400/3500, ohare based) has a second ohare chip
         * effectively making a total of 64.
         */
        max_irqs = max_real_irqs = 32;
        irqctrler = find_devices("mac-io");
        if (irqctrler)
        {
                max_real_irqs = 64;
                if (irqctrler->next)
                        max_irqs = 128;
                else
                        max_irqs = 64;
        }
        for ( i = 0; i < max_real_irqs ; i++ )
                irq_desc[i].handler = &pmac_pic;

        /* get addresses of first controller */
        if (irqctrler) {
                if  (irqctrler->n_addrs > 0) {
                        addr = (unsigned long) 
                                ioremap(irqctrler->addrs[0].address, 0x40);
                        for (i = 0; i < 2; ++i)
                                pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
                                        (addr + (2 - i) * 0x10);
                }
                
                /* get addresses of second controller */
                irqctrler = irqctrler->next;
                if (irqctrler && irqctrler->n_addrs > 0) {
                        addr = (unsigned long) 
                                ioremap(irqctrler->addrs[0].address, 0x40);
                        for (i = 2; i < 4; ++i)
                                pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
                                        (addr + (4 - i) * 0x10);
                }
        } else {
                /* older powermacs have a GC (grand central) or ohare at
                   f3000000, with interrupt control registers at f3000020. */
                addr = (unsigned long) ioremap(0xf3000000, 0x40);
                pmac_irq_hw[0] = (volatile struct pmac_irq_hw *) (addr + 0x20);
        }

        /* PowerBooks 3400 and 3500 can have a second controller in a second
           ohare chip, on the combo ethernet/modem card */
        if (machine_is_compatible("AAPL,3400/2400")
             || machine_is_compatible("AAPL,3500"))
                enable_second_ohare();

        /* disable all interrupts in all controllers */
        for (i = 0; i * 32 < max_irqs; ++i)
                out_le32(&pmac_irq_hw[i]->enable, 0);
        
        /* get interrupt line of secondary interrupt controller */
        if (irqctrler) {
                second_irq = irqctrler->intrs[0].line;
                printk(KERN_INFO "irq: secondary controller on irq %d\n",
                        (int)second_irq);
                if (device_is_compatible(irqctrler, "gatwick"))
                        pmac_fix_gatwick_interrupts(irqctrler, max_real_irqs);
                for ( i = max_real_irqs ; i < max_irqs ; i++ )
                        irq_desc[i].handler = &gatwick_pic;
                request_irq( second_irq, gatwick_action, SA_INTERRUPT,
                             "gatwick cascade", 0 );
        }
        printk("System has %d possible interrupts\n", max_irqs);
        if (max_irqs != max_real_irqs)
                printk(KERN_DEBUG "%d interrupts on main controller\n",
                        max_real_irqs);

#ifdef CONFIG_XMON
        request_irq(20, xmon_irq, 0, "NMI - XMON", 0);
#endif  /* CONFIG_XMON */
}

#ifdef CONFIG_PMAC_PBOOK
/*
 * These procedures are used in implementing sleep on the powerbooks.
 * sleep_save_intrs() saves the states of all interrupt enables
 * and disables all interupts except for the nominated one.
 * sleep_restore_intrs() restores the states of all interrupt enables.
 */
unsigned int sleep_save_mask[2];

void
sleep_save_intrs(int viaint)
{
        sleep_save_mask[0] = ppc_cached_irq_mask[0];
        sleep_save_mask[1] = ppc_cached_irq_mask[1];
        ppc_cached_irq_mask[0] = 0;
        ppc_cached_irq_mask[1] = 0;
        set_bit(viaint, ppc_cached_irq_mask);
        out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);
        if (max_real_irqs > 32)
                out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);
        (void)in_le32(&pmac_irq_hw[0]->flag);
        /* make sure mask gets to controller before we return to caller */
        mb();
        (void)in_le32(&pmac_irq_hw[0]->enable);
}

void
sleep_restore_intrs(void)
{
        int i;

        out_le32(&pmac_irq_hw[0]->enable, 0);
        if (max_real_irqs > 32)
                out_le32(&pmac_irq_hw[1]->enable, 0);
        mb();
        for (i = 0; i < max_real_irqs; ++i)
                if (test_bit(i, sleep_save_mask))
                        pmac_unmask_irq(i);
}
#endif /* CONFIG_PMAC_PBOOK */