linux-zen-server/arch/sparc/kernel/prom_irqtrans.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_platform.h>

#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/irq.h>
#include <asm/upa.h>

#include "prom.h"

#ifdef CONFIG_PCI
/* PSYCHO interrupt mapping support. */
#define PSYCHO_IMAP_A_SLOT0	0x0c00UL
#define PSYCHO_IMAP_B_SLOT0	0x0c20UL
static unsigned long psycho_pcislot_imap_offset(unsigned long ino)
{
	unsigned int bus =  (ino & 0x10) >> 4;
	unsigned int slot = (ino & 0x0c) >> 2;

	if (bus == 0)
		return PSYCHO_IMAP_A_SLOT0 + (slot * 8);
	else
		return PSYCHO_IMAP_B_SLOT0 + (slot * 8);
}

#define PSYCHO_OBIO_IMAP_BASE	0x1000UL

#define PSYCHO_ONBOARD_IRQ_BASE		0x20
#define psycho_onboard_imap_offset(__ino) \
	(PSYCHO_OBIO_IMAP_BASE + (((__ino) & 0x1f) << 3))

#define PSYCHO_ICLR_A_SLOT0	0x1400UL
#define PSYCHO_ICLR_SCSI	0x1800UL

#define psycho_iclr_offset(ino)					      \
	((ino & 0x20) ? (PSYCHO_ICLR_SCSI + (((ino) & 0x1f) << 3)) :  \
			(PSYCHO_ICLR_A_SLOT0 + (((ino) & 0x1f)<<3)))

static unsigned int psycho_irq_build(struct device_node *dp,
				     unsigned int ino,
				     void *_data)
{
	unsigned long controller_regs = (unsigned long) _data;
	unsigned long imap, iclr;
	unsigned long imap_off, iclr_off;
	int inofixup = 0;

	ino &= 0x3f;
	if (ino < PSYCHO_ONBOARD_IRQ_BASE) {
		/* PCI slot */
		imap_off = psycho_pcislot_imap_offset(ino);
	} else {
		/* Onboard device */
		imap_off = psycho_onboard_imap_offset(ino);
	}

	/* Now build the IRQ bucket. */
	imap = controller_regs + imap_off;

	iclr_off = psycho_iclr_offset(ino);
	iclr = controller_regs + iclr_off;

	if ((ino & 0x20) == 0)
		inofixup = ino & 0x03;

	return build_irq(inofixup, iclr, imap);
}

static void __init psycho_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = psycho_irq_build;

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = (void *) regs[2].phys_addr;
}

#define sabre_read(__reg) \
({	u64 __ret; \
	__asm__ __volatile__("ldxa [%1] %2, %0" \
			     : "=r" (__ret) \
			     : "r" (__reg), "i" (ASI_PHYS_BYPASS_EC_E) \
			     : "memory"); \
	__ret; \
})

struct sabre_irq_data {
	unsigned long controller_regs;
	unsigned int pci_first_busno;
};
#define SABRE_CONFIGSPACE	0x001000000UL
#define SABRE_WRSYNC		0x1c20UL

#define SABRE_CONFIG_BASE(CONFIG_SPACE)	\
	(CONFIG_SPACE | (1UL << 24))
#define SABRE_CONFIG_ENCODE(BUS, DEVFN, REG)	\
	(((unsigned long)(BUS)   << 16) |	\
	 ((unsigned long)(DEVFN) << 8)  |	\
	 ((unsigned long)(REG)))

/* When a device lives behind a bridge deeper in the PCI bus topology
 * than APB, a special sequence must run to make sure all pending DMA
 * transfers at the time of IRQ delivery are visible in the coherency
 * domain by the cpu.  This sequence is to perform a read on the far
 * side of the non-APB bridge, then perform a read of Sabre's DMA
 * write-sync register.
 */
static void sabre_wsync_handler(unsigned int ino, void *_arg1, void *_arg2)
{
	unsigned int phys_hi = (unsigned int) (unsigned long) _arg1;
	struct sabre_irq_data *irq_data = _arg2;
	unsigned long controller_regs = irq_data->controller_regs;
	unsigned long sync_reg = controller_regs + SABRE_WRSYNC;
	unsigned long config_space = controller_regs + SABRE_CONFIGSPACE;
	unsigned int bus, devfn;
	u16 _unused;

	config_space = SABRE_CONFIG_BASE(config_space);

	bus = (phys_hi >> 16) & 0xff;
	devfn = (phys_hi >> 8) & 0xff;

	config_space |= SABRE_CONFIG_ENCODE(bus, devfn, 0x00);

	__asm__ __volatile__("membar #Sync\n\t"
			     "lduha [%1] %2, %0\n\t"
			     "membar #Sync"
			     : "=r" (_unused)
			     : "r" ((u16 *) config_space),
			       "i" (ASI_PHYS_BYPASS_EC_E_L)
			     : "memory");

	sabre_read(sync_reg);
}

#define SABRE_IMAP_A_SLOT0	0x0c00UL
#define SABRE_IMAP_B_SLOT0	0x0c20UL
#define SABRE_ICLR_A_SLOT0	0x1400UL
#define SABRE_ICLR_B_SLOT0	0x1480UL
#define SABRE_ICLR_SCSI		0x1800UL
#define SABRE_ICLR_ETH		0x1808UL
#define SABRE_ICLR_BPP		0x1810UL
#define SABRE_ICLR_AU_REC	0x1818UL
#define SABRE_ICLR_AU_PLAY	0x1820UL
#define SABRE_ICLR_PFAIL	0x1828UL
#define SABRE_ICLR_KMS		0x1830UL
#define SABRE_ICLR_FLPY		0x1838UL
#define SABRE_ICLR_SHW		0x1840UL
#define SABRE_ICLR_KBD		0x1848UL
#define SABRE_ICLR_MS		0x1850UL
#define SABRE_ICLR_SER		0x1858UL
#define SABRE_ICLR_UE		0x1870UL
#define SABRE_ICLR_CE		0x1878UL
#define SABRE_ICLR_PCIERR	0x1880UL

static unsigned long sabre_pcislot_imap_offset(unsigned long ino)
{
	unsigned int bus =  (ino & 0x10) >> 4;
	unsigned int slot = (ino & 0x0c) >> 2;

	if (bus == 0)
		return SABRE_IMAP_A_SLOT0 + (slot * 8);
	else
		return SABRE_IMAP_B_SLOT0 + (slot * 8);
}

#define SABRE_OBIO_IMAP_BASE	0x1000UL
#define SABRE_ONBOARD_IRQ_BASE	0x20
#define sabre_onboard_imap_offset(__ino) \
	(SABRE_OBIO_IMAP_BASE + (((__ino) & 0x1f) << 3))

#define sabre_iclr_offset(ino)					      \
	((ino & 0x20) ? (SABRE_ICLR_SCSI + (((ino) & 0x1f) << 3)) :  \
			(SABRE_ICLR_A_SLOT0 + (((ino) & 0x1f)<<3)))

static int sabre_device_needs_wsync(struct device_node *dp)
{
	struct device_node *parent = dp->parent;
	const char *parent_model, *parent_compat;

	/* This traversal up towards the root is meant to
	 * handle two cases:
	 *
	 * 1) non-PCI bus sitting under PCI, such as 'ebus'
	 * 2) the PCI controller interrupts themselves, which
	 *    will use the sabre_irq_build but do not need
	 *    the DMA synchronization handling
	 */
	while (parent) {
		if (of_node_is_type(parent, "pci"))
			break;
		parent = parent->parent;
	}

	if (!parent)
		return 0;

	parent_model = of_get_property(parent,
				       "model", NULL);
	if (parent_model &&
	    (!strcmp(parent_model, "SUNW,sabre") ||
	     !strcmp(parent_model, "SUNW,simba")))
		return 0;

	parent_compat = of_get_property(parent,
					"compatible", NULL);
	if (parent_compat &&
	    (!strcmp(parent_compat, "pci108e,a000") ||
	     !strcmp(parent_compat, "pci108e,a001")))
		return 0;

	return 1;
}

static unsigned int sabre_irq_build(struct device_node *dp,
				    unsigned int ino,
				    void *_data)
{
	struct sabre_irq_data *irq_data = _data;
	unsigned long controller_regs = irq_data->controller_regs;
	const struct linux_prom_pci_registers *regs;
	unsigned long imap, iclr;
	unsigned long imap_off, iclr_off;
	int inofixup = 0;
	int irq;

	ino &= 0x3f;
	if (ino < SABRE_ONBOARD_IRQ_BASE) {
		/* PCI slot */
		imap_off = sabre_pcislot_imap_offset(ino);
	} else {
		/* onboard device */
		imap_off = sabre_onboard_imap_offset(ino);
	}

	/* Now build the IRQ bucket. */
	imap = controller_regs + imap_off;

	iclr_off = sabre_iclr_offset(ino);
	iclr = controller_regs + iclr_off;

	if ((ino & 0x20) == 0)
		inofixup = ino & 0x03;

	irq = build_irq(inofixup, iclr, imap);

	/* If the parent device is a PCI<->PCI bridge other than
	 * APB, we have to install a pre-handler to ensure that
	 * all pending DMA is drained before the interrupt handler
	 * is run.
	 */
	regs = of_get_property(dp, "reg", NULL);
	if (regs && sabre_device_needs_wsync(dp)) {
		irq_install_pre_handler(irq,
					sabre_wsync_handler,
					(void *) (long) regs->phys_hi,
					(void *) irq_data);
	}

	return irq;
}

static void __init sabre_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;
	struct sabre_irq_data *irq_data;
	const u32 *busrange;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = sabre_irq_build;

	irq_data = prom_early_alloc(sizeof(struct sabre_irq_data));

	regs = of_get_property(dp, "reg", NULL);
	irq_data->controller_regs = regs[0].phys_addr;

	busrange = of_get_property(dp, "bus-range", NULL);
	irq_data->pci_first_busno = busrange[0];

	dp->irq_trans->data = irq_data;
}

/* SCHIZO interrupt mapping support.  Unlike Psycho, for this controller the
 * imap/iclr registers are per-PBM.
 */
#define SCHIZO_IMAP_BASE	0x1000UL
#define SCHIZO_ICLR_BASE	0x1400UL

static unsigned long schizo_imap_offset(unsigned long ino)
{
	return SCHIZO_IMAP_BASE + (ino * 8UL);
}

static unsigned long schizo_iclr_offset(unsigned long ino)
{
	return SCHIZO_ICLR_BASE + (ino * 8UL);
}

static unsigned long schizo_ino_to_iclr(unsigned long pbm_regs,
					unsigned int ino)
{

	return pbm_regs + schizo_iclr_offset(ino);
}

static unsigned long schizo_ino_to_imap(unsigned long pbm_regs,
					unsigned int ino)
{
	return pbm_regs + schizo_imap_offset(ino);
}

#define schizo_read(__reg) \
({	u64 __ret; \
	__asm__ __volatile__("ldxa [%1] %2, %0" \
			     : "=r" (__ret) \
			     : "r" (__reg), "i" (ASI_PHYS_BYPASS_EC_E) \
			     : "memory"); \
	__ret; \
})
#define schizo_write(__reg, __val) \
	__asm__ __volatile__("stxa %0, [%1] %2" \
			     : /* no outputs */ \
			     : "r" (__val), "r" (__reg), \
			       "i" (ASI_PHYS_BYPASS_EC_E) \
			     : "memory")

static void tomatillo_wsync_handler(unsigned int ino, void *_arg1, void *_arg2)
{
	unsigned long sync_reg = (unsigned long) _arg2;
	u64 mask = 1UL << (ino & IMAP_INO);
	u64 val;
	int limit;

	schizo_write(sync_reg, mask);

	limit = 100000;
	val = 0;
	while (--limit) {
		val = schizo_read(sync_reg);
		if (!(val & mask))
			break;
	}
	if (limit <= 0) {
		printk("tomatillo_wsync_handler: DMA won't sync [%llx:%llx]\n",
		       val, mask);
	}

	if (_arg1) {
		static unsigned char cacheline[64]
			__attribute__ ((aligned (64)));

		__asm__ __volatile__("rd %%fprs, %0\n\t"
				     "or %0, %4, %1\n\t"
				     "wr %1, 0x0, %%fprs\n\t"
				     "stda %%f0, [%5] %6\n\t"
				     "wr %0, 0x0, %%fprs\n\t"
				     "membar #Sync"
				     : "=&r" (mask), "=&r" (val)
				     : "0" (mask), "1" (val),
				     "i" (FPRS_FEF), "r" (&cacheline[0]),
				     "i" (ASI_BLK_COMMIT_P));
	}
}

struct schizo_irq_data {
	unsigned long pbm_regs;
	unsigned long sync_reg;
	u32 portid;
	int chip_version;
};

static unsigned int schizo_irq_build(struct device_node *dp,
				     unsigned int ino,
				     void *_data)
{
	struct schizo_irq_data *irq_data = _data;
	unsigned long pbm_regs = irq_data->pbm_regs;
	unsigned long imap, iclr;
	int ign_fixup;
	int irq;
	int is_tomatillo;

	ino &= 0x3f;

	/* Now build the IRQ bucket. */
	imap = schizo_ino_to_imap(pbm_regs, ino);
	iclr = schizo_ino_to_iclr(pbm_regs, ino);

	/* On Schizo, no inofixup occurs.  This is because each
	 * INO has it's own IMAP register.  On Psycho and Sabre
	 * there is only one IMAP register for each PCI slot even
	 * though four different INOs can be generated by each
	 * PCI slot.
	 *
	 * But, for JBUS variants (essentially, Tomatillo), we have
	 * to fixup the lowest bit of the interrupt group number.
	 */
	ign_fixup = 0;

	is_tomatillo = (irq_data->sync_reg != 0UL);

	if (is_tomatillo) {
		if (irq_data->portid & 1)
			ign_fixup = (1 << 6);
	}

	irq = build_irq(ign_fixup, iclr, imap);

	if (is_tomatillo) {
		irq_install_pre_handler(irq,
					tomatillo_wsync_handler,
					((irq_data->chip_version <= 4) ?
					 (void *) 1 : (void *) 0),
					(void *) irq_data->sync_reg);
	}

	return irq;
}

static void __init __schizo_irq_trans_init(struct device_node *dp,
					   int is_tomatillo)
{
	const struct linux_prom64_registers *regs;
	struct schizo_irq_data *irq_data;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = schizo_irq_build;

	irq_data = prom_early_alloc(sizeof(struct schizo_irq_data));

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = irq_data;

	irq_data->pbm_regs = regs[0].phys_addr;
	if (is_tomatillo)
		irq_data->sync_reg = regs[3].phys_addr + 0x1a18UL;
	else
		irq_data->sync_reg = 0UL;
	irq_data->portid = of_getintprop_default(dp, "portid", 0);
	irq_data->chip_version = of_getintprop_default(dp, "version#", 0);
}

static void __init schizo_irq_trans_init(struct device_node *dp)
{
	__schizo_irq_trans_init(dp, 0);
}

static void __init tomatillo_irq_trans_init(struct device_node *dp)
{
	__schizo_irq_trans_init(dp, 1);
}

static unsigned int pci_sun4v_irq_build(struct device_node *dp,
					unsigned int devino,
					void *_data)
{
	u32 devhandle = (u32) (unsigned long) _data;

	return sun4v_build_irq(devhandle, devino);
}

static void __init pci_sun4v_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = pci_sun4v_irq_build;

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = (void *) (unsigned long)
		((regs->phys_addr >> 32UL) & 0x0fffffff);
}

struct fire_irq_data {
	unsigned long pbm_regs;
	u32 portid;
};

#define FIRE_IMAP_BASE	0x001000
#define FIRE_ICLR_BASE	0x001400

static unsigned long fire_imap_offset(unsigned long ino)
{
	return FIRE_IMAP_BASE + (ino * 8UL);
}

static unsigned long fire_iclr_offset(unsigned long ino)
{
	return FIRE_ICLR_BASE + (ino * 8UL);
}

static unsigned long fire_ino_to_iclr(unsigned long pbm_regs,
					    unsigned int ino)
{
	return pbm_regs + fire_iclr_offset(ino);
}

static unsigned long fire_ino_to_imap(unsigned long pbm_regs,
					    unsigned int ino)
{
	return pbm_regs + fire_imap_offset(ino);
}

static unsigned int fire_irq_build(struct device_node *dp,
					 unsigned int ino,
					 void *_data)
{
	struct fire_irq_data *irq_data = _data;
	unsigned long pbm_regs = irq_data->pbm_regs;
	unsigned long imap, iclr;
	unsigned long int_ctrlr;

	ino &= 0x3f;

	/* Now build the IRQ bucket. */
	imap = fire_ino_to_imap(pbm_regs, ino);
	iclr = fire_ino_to_iclr(pbm_regs, ino);

	/* Set the interrupt controller number.  */
	int_ctrlr = 1 << 6;
	upa_writeq(int_ctrlr, imap);

	/* The interrupt map registers do not have an INO field
	 * like other chips do.  They return zero in the INO
	 * field, and the interrupt controller number is controlled
	 * in bits 6 to 9.  So in order for build_irq() to get
	 * the INO right we pass it in as part of the fixup
	 * which will get added to the map register zero value
	 * read by build_irq().
	 */
	ino |= (irq_data->portid << 6);
	ino -= int_ctrlr;
	return build_irq(ino, iclr, imap);
}

static void __init fire_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;
	struct fire_irq_data *irq_data;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = fire_irq_build;

	irq_data = prom_early_alloc(sizeof(struct fire_irq_data));

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = irq_data;

	irq_data->pbm_regs = regs[0].phys_addr;
	irq_data->portid = of_getintprop_default(dp, "portid", 0);
}
#endif /* CONFIG_PCI */

#ifdef CONFIG_SBUS
/* INO number to IMAP register offset for SYSIO external IRQ's.
 * This should conform to both Sunfire/Wildfire server and Fusion
 * desktop designs.
 */
#define SYSIO_IMAP_SLOT0	0x2c00UL
#define SYSIO_IMAP_SLOT1	0x2c08UL
#define SYSIO_IMAP_SLOT2	0x2c10UL
#define SYSIO_IMAP_SLOT3	0x2c18UL
#define SYSIO_IMAP_SCSI		0x3000UL
#define SYSIO_IMAP_ETH		0x3008UL
#define SYSIO_IMAP_BPP		0x3010UL
#define SYSIO_IMAP_AUDIO	0x3018UL
#define SYSIO_IMAP_PFAIL	0x3020UL
#define SYSIO_IMAP_KMS		0x3028UL
#define SYSIO_IMAP_FLPY		0x3030UL
#define SYSIO_IMAP_SHW		0x3038UL
#define SYSIO_IMAP_KBD		0x3040UL
#define SYSIO_IMAP_MS		0x3048UL
#define SYSIO_IMAP_SER		0x3050UL
#define SYSIO_IMAP_TIM0		0x3060UL
#define SYSIO_IMAP_TIM1		0x3068UL
#define SYSIO_IMAP_UE		0x3070UL
#define SYSIO_IMAP_CE		0x3078UL
#define SYSIO_IMAP_SBERR	0x3080UL
#define SYSIO_IMAP_PMGMT	0x3088UL
#define SYSIO_IMAP_GFX		0x3090UL
#define SYSIO_IMAP_EUPA		0x3098UL

#define bogon     ((unsigned long) -1)
static unsigned long sysio_irq_offsets[] = {
	/* SBUS Slot 0 --> 3, level 1 --> 7 */
	SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0,
	SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0, SYSIO_IMAP_SLOT0,
	SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1,
	SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1, SYSIO_IMAP_SLOT1,
	SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2,
	SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2, SYSIO_IMAP_SLOT2,
	SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3,
	SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3, SYSIO_IMAP_SLOT3,

	/* Onboard devices (not relevant/used on SunFire). */
	SYSIO_IMAP_SCSI,
	SYSIO_IMAP_ETH,
	SYSIO_IMAP_BPP,
	bogon,
	SYSIO_IMAP_AUDIO,
	SYSIO_IMAP_PFAIL,
	bogon,
	bogon,
	SYSIO_IMAP_KMS,
	SYSIO_IMAP_FLPY,
	SYSIO_IMAP_SHW,
	SYSIO_IMAP_KBD,
	SYSIO_IMAP_MS,
	SYSIO_IMAP_SER,
	bogon,
	bogon,
	SYSIO_IMAP_TIM0,
	SYSIO_IMAP_TIM1,
	bogon,
	bogon,
	SYSIO_IMAP_UE,
	SYSIO_IMAP_CE,
	SYSIO_IMAP_SBERR,
	SYSIO_IMAP_PMGMT,
	SYSIO_IMAP_GFX,
	SYSIO_IMAP_EUPA,
};

#undef bogon

#define NUM_SYSIO_OFFSETS ARRAY_SIZE(sysio_irq_offsets)

/* Convert Interrupt Mapping register pointer to associated
 * Interrupt Clear register pointer, SYSIO specific version.
 */
#define SYSIO_ICLR_UNUSED0	0x3400UL
#define SYSIO_ICLR_SLOT0	0x3408UL
#define SYSIO_ICLR_SLOT1	0x3448UL
#define SYSIO_ICLR_SLOT2	0x3488UL
#define SYSIO_ICLR_SLOT3	0x34c8UL
static unsigned long sysio_imap_to_iclr(unsigned long imap)
{
	unsigned long diff = SYSIO_ICLR_UNUSED0 - SYSIO_IMAP_SLOT0;
	return imap + diff;
}

static unsigned int sbus_of_build_irq(struct device_node *dp,
				      unsigned int ino,
				      void *_data)
{
	unsigned long reg_base = (unsigned long) _data;
	const struct linux_prom_registers *regs;
	unsigned long imap, iclr;
	int sbus_slot = 0;
	int sbus_level = 0;

	ino &= 0x3f;

	regs = of_get_property(dp, "reg", NULL);
	if (regs)
		sbus_slot = regs->which_io;

	if (ino < 0x20)
		ino += (sbus_slot * 8);

	imap = sysio_irq_offsets[ino];
	if (imap == ((unsigned long)-1)) {
		prom_printf("get_irq_translations: Bad SYSIO INO[%x]\n",
			    ino);
		prom_halt();
	}
	imap += reg_base;

	/* SYSIO inconsistency.  For external SLOTS, we have to select
	 * the right ICLR register based upon the lower SBUS irq level
	 * bits.
	 */
	if (ino >= 0x20) {
		iclr = sysio_imap_to_iclr(imap);
	} else {
		sbus_level = ino & 0x7;

		switch(sbus_slot) {
		case 0:
			iclr = reg_base + SYSIO_ICLR_SLOT0;
			break;
		case 1:
			iclr = reg_base + SYSIO_ICLR_SLOT1;
			break;
		case 2:
			iclr = reg_base + SYSIO_ICLR_SLOT2;
			break;
		default:
		case 3:
			iclr = reg_base + SYSIO_ICLR_SLOT3;
			break;
		}

		iclr += ((unsigned long)sbus_level - 1UL) * 8UL;
	}
	return build_irq(sbus_level, iclr, imap);
}

static void __init sbus_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = sbus_of_build_irq;

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = (void *) (unsigned long) regs->phys_addr;
}
#endif /* CONFIG_SBUS */


static unsigned int central_build_irq(struct device_node *dp,
				      unsigned int ino,
				      void *_data)
{
	struct device_node *central_dp = _data;
	struct platform_device *central_op = of_find_device_by_node(central_dp);
	struct resource *res;
	unsigned long imap, iclr;
	u32 tmp;

	if (of_node_name_eq(dp, "eeprom")) {
		res = &central_op->resource[5];
	} else if (of_node_name_eq(dp, "zs")) {
		res = &central_op->resource[4];
	} else if (of_node_name_eq(dp, "clock-board")) {
		res = &central_op->resource[3];
	} else {
		return ino;
	}

	imap = res->start + 0x00UL;
	iclr = res->start + 0x10UL;

	/* Set the INO state to idle, and disable.  */
	upa_writel(0, iclr);
	upa_readl(iclr);

	tmp = upa_readl(imap);
	tmp &= ~0x80000000;
	upa_writel(tmp, imap);

	return build_irq(0, iclr, imap);
}

static void __init central_irq_trans_init(struct device_node *dp)
{
	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = central_build_irq;

	dp->irq_trans->data = dp;
}

struct irq_trans {
	const char *name;
	void (*init)(struct device_node *);
};

#ifdef CONFIG_PCI
static struct irq_trans __initdata pci_irq_trans_table[] = {
	{ "SUNW,sabre", sabre_irq_trans_init },
	{ "pci108e,a000", sabre_irq_trans_init },
	{ "pci108e,a001", sabre_irq_trans_init },
	{ "SUNW,psycho", psycho_irq_trans_init },
	{ "pci108e,8000", psycho_irq_trans_init },
	{ "SUNW,schizo", schizo_irq_trans_init },
	{ "pci108e,8001", schizo_irq_trans_init },
	{ "SUNW,schizo+", schizo_irq_trans_init },
	{ "pci108e,8002", schizo_irq_trans_init },
	{ "SUNW,tomatillo", tomatillo_irq_trans_init },
	{ "pci108e,a801", tomatillo_irq_trans_init },
	{ "SUNW,sun4v-pci", pci_sun4v_irq_trans_init },
	{ "pciex108e,80f0", fire_irq_trans_init },
};
#endif

static unsigned int sun4v_vdev_irq_build(struct device_node *dp,
					 unsigned int devino,
					 void *_data)
{
	u32 devhandle = (u32) (unsigned long) _data;

	return sun4v_build_irq(devhandle, devino);
}

static void __init sun4v_vdev_irq_trans_init(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;

	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
	dp->irq_trans->irq_build = sun4v_vdev_irq_build;

	regs = of_get_property(dp, "reg", NULL);
	dp->irq_trans->data = (void *) (unsigned long)
		((regs->phys_addr >> 32UL) & 0x0fffffff);
}

void __init irq_trans_init(struct device_node *dp)
{
#ifdef CONFIG_PCI
	const char *model;
	int i;
#endif

#ifdef CONFIG_PCI
	model = of_get_property(dp, "model", NULL);
	if (!model)
		model = of_get_property(dp, "compatible", NULL);
	if (model) {
		for (i = 0; i < ARRAY_SIZE(pci_irq_trans_table); i++) {
			struct irq_trans *t = &pci_irq_trans_table[i];

			if (!strcmp(model, t->name)) {
				t->init(dp);
				return;
			}
		}
	}
#endif
#ifdef CONFIG_SBUS
	if (of_node_name_eq(dp, "sbus") ||
	    of_node_name_eq(dp, "sbi")) {
		sbus_irq_trans_init(dp);
		return;
	}
#endif
	if (of_node_name_eq(dp, "fhc") &&
	    of_node_name_eq(dp->parent, "central")) {
		central_irq_trans_init(dp);
		return;
	}
	if (of_node_name_eq(dp, "virtual-devices") ||
	    of_node_name_eq(dp, "niu")) {
		sun4v_vdev_irq_trans_init(dp);
		return;
	}
}