Merge tag 'irqdomain-for-linus' of git://git.secretlab.ca/git/linux-2.6

Pull irq_domain support for all architectures from Grant Likely:
 "Generialize powerpc's irq_host as irq_domain

  This branch takes the PowerPC irq_host infrastructure (reverse mapping
  from Linux IRQ numbers to hardware irq numbering), generalizes it,
  renames it to irq_domain, and makes it available to all architectures.

  Originally the plan has been to create an all-new irq_domain
  implementation which addresses some of the powerpc shortcomings such
  as not handling 1:1 mappings well, but doing that proved to be far
  more difficult and invasive than generalizing the working code and
  refactoring it in-place.  So, this branch rips out the 'new'
  irq_domain and replaces it with the modified powerpc version (in a
  fully bisectable way of course).  It converts all users over to the
  new API and makes irq_domain selectable on any architecture.

  No architecture is forced to enable irq_domain, but the infrastructure
  is required for doing OpenFirmware style irq translations.  It will
  even work on SPARC even though SPARC has it's own mechanism for
  translating irqs at boot time.  MIPS, microblaze, embedded x86 and c6x
  are converted too.

  The resulting irq_domain code is probably still too verbose and can be
  optimized more, but that can be done incrementally and is a task for
  follow-on patches."

* tag 'irqdomain-for-linus' of git://git.secretlab.ca/git/linux-2.6: (31 commits)
  dt: fix twl4030 for non-dt compile on x86
  mfd: twl-core: Add IRQ_DOMAIN dependency
  devicetree: Add empty of_platform_populate() for !CONFIG_OF_ADDRESS (sparc)
  irq_domain: Centralize definition of irq_dispose_mapping()
  irq_domain/mips: Allow irq_domain on MIPS
  irq_domain/x86: Convert x86 (embedded) to use common irq_domain
  ppc-6xx: fix build failure in flipper-pic.c and hlwd-pic.c
  irq_domain/microblaze: Convert microblaze to use irq_domains
  irq_domain/powerpc: Replace custom xlate functions with library functions
  irq_domain/powerpc: constify irq_domain_ops
  irq_domain/c6x: Use library of xlate functions
  irq_domain/c6x: constify irq_domain structures
  irq_domain/c6x: Convert c6x to use generic irq_domain support.
  irq_domain: constify irq_domain_ops
  irq_domain: Create common xlate functions that device drivers can use
  irq_domain: Remove irq_domain_add_simple()
  irq_domain: Remove 'new' irq_domain in favour of the ppc one
  mfd: twl-core.c: Fix the number of interrupts managed by twl4030
  of/address: add empty static inlines for !CONFIG_OF
  irq_domain: Add support for base irq and hwirq in legacy mappings
  ...

18 files changed, 92 insertions, 166 deletions

diff --git a/arch/powerpc/sysdev/cpm1.c b/arch/powerpc/sysdev/cpm1.c
index 5d7d59a43c4c..d4fa03f2b6ac 100644
--- a/arch/powerpc/sysdev/cpm1.c
+++ b/arch/powerpc/sysdev/cpm1.c
@@ -54,7 +54,7 @@ cpm8xx_t __iomem *cpmp;  /* Pointer to comm processor space */
 immap_t __iomem *mpc8xx_immr;
 static cpic8xx_t __iomem *cpic_reg;
 
-static struct irq_host *cpm_pic_host;
+static struct irq_domain *cpm_pic_host;
 
 static void cpm_mask_irq(struct irq_data *d)
 {
@@ -98,7 +98,7 @@ int cpm_get_irq(void)
 	return irq_linear_revmap(cpm_pic_host, cpm_vec);
 }
 
-static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
+static int cpm_pic_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw);
@@ -123,7 +123,7 @@ static struct irqaction cpm_error_irqaction = {
 	.name = "error",
 };
 
-static struct irq_host_ops cpm_pic_host_ops = {
+static const struct irq_domain_ops cpm_pic_host_ops = {
 	.map = cpm_pic_host_map,
 };
 
@@ -164,8 +164,7 @@ unsigned int cpm_pic_init(void)
 
 	out_be32(&cpic_reg->cpic_cimr, 0);
 
-	cpm_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
-				      64, &cpm_pic_host_ops, 64);
+	cpm_pic_host = irq_domain_add_linear(np, 64, &cpm_pic_host_ops, NULL);
 	if (cpm_pic_host == NULL) {
 		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
 		sirq = NO_IRQ;
diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
index bcab50e2a9eb..d3be961e2ae7 100644
--- a/arch/powerpc/sysdev/cpm2_pic.c
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -50,7 +50,7 @@
 
 static intctl_cpm2_t __iomem *cpm2_intctl;
 
-static struct irq_host *cpm2_pic_host;
+static struct irq_domain *cpm2_pic_host;
 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
 static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
 
@@ -214,7 +214,7 @@ unsigned int cpm2_get_irq(void)
 	return irq_linear_revmap(cpm2_pic_host, irq);
 }
 
-static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
+static int cpm2_pic_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
@@ -224,21 +224,9 @@ static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int cpm2_pic_host_xlate(struct irq_host *h, struct device_node *ct,
-			    const u32 *intspec, unsigned int intsize,
-			    irq_hw_number_t *out_hwirq, unsigned int *out_flags)
-{
-	*out_hwirq = intspec[0];
-	if (intsize > 1)
-		*out_flags = intspec[1];
-	else
-		*out_flags = IRQ_TYPE_NONE;
-	return 0;
-}
-
-static struct irq_host_ops cpm2_pic_host_ops = {
+static const struct irq_domain_ops cpm2_pic_host_ops = {
 	.map = cpm2_pic_host_map,
-	.xlate = cpm2_pic_host_xlate,
+	.xlate = irq_domain_xlate_onetwocell,
 };
 
 void cpm2_pic_init(struct device_node *node)
@@ -275,8 +263,7 @@ void cpm2_pic_init(struct device_node *node)
 	out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
 
 	/* create a legacy host */
-	cpm2_pic_host = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
-				       64, &cpm2_pic_host_ops, 64);
+	cpm2_pic_host = irq_domain_add_linear(node, 64, &cpm2_pic_host_ops, NULL);
 	if (cpm2_pic_host == NULL) {
 		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
 		return;
diff --git a/arch/powerpc/sysdev/ehv_pic.c b/arch/powerpc/sysdev/ehv_pic.c
index b6731e4a6646..6e0e1005227f 100644
--- a/arch/powerpc/sysdev/ehv_pic.c
+++ b/arch/powerpc/sysdev/ehv_pic.c
@@ -182,13 +182,13 @@ unsigned int ehv_pic_get_irq(void)
 	return irq_linear_revmap(global_ehv_pic->irqhost, irq);
 }
 
-static int ehv_pic_host_match(struct irq_host *h, struct device_node *node)
+static int ehv_pic_host_match(struct irq_domain *h, struct device_node *node)
 {
 	/* Exact match, unless ehv_pic node is NULL */
 	return h->of_node == NULL || h->of_node == node;
 }
 
-static int ehv_pic_host_map(struct irq_host *h, unsigned int virq,
+static int ehv_pic_host_map(struct irq_domain *h, unsigned int virq,
 			 irq_hw_number_t hw)
 {
 	struct ehv_pic *ehv_pic = h->host_data;
@@ -217,7 +217,7 @@ static int ehv_pic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int ehv_pic_host_xlate(struct irq_host *h, struct device_node *ct,
+static int ehv_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
 			   const u32 *intspec, unsigned int intsize,
 			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 
@@ -248,7 +248,7 @@ static int ehv_pic_host_xlate(struct irq_host *h, struct device_node *ct,
 	return 0;
 }
 
-static struct irq_host_ops ehv_pic_host_ops = {
+static const struct irq_domain_ops ehv_pic_host_ops = {
 	.match = ehv_pic_host_match,
 	.map = ehv_pic_host_map,
 	.xlate = ehv_pic_host_xlate,
@@ -275,9 +275,8 @@ void __init ehv_pic_init(void)
 		return;
 	}
 
-	ehv_pic->irqhost = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
-		NR_EHV_PIC_INTS, &ehv_pic_host_ops, 0);
-
+	ehv_pic->irqhost = irq_domain_add_linear(np, NR_EHV_PIC_INTS,
+						 &ehv_pic_host_ops, ehv_pic);
 	if (!ehv_pic->irqhost) {
 		of_node_put(np);
 		kfree(ehv_pic);
@@ -293,7 +292,6 @@ void __init ehv_pic_init(void)
 		of_node_put(np2);
 	}
 
-	ehv_pic->irqhost->host_data = ehv_pic;
 	ehv_pic->hc_irq = ehv_pic_irq_chip;
 	ehv_pic->hc_irq.irq_set_affinity = ehv_pic_set_affinity;
 	ehv_pic->coreint_flag = coreint_flag;
diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c
index ecb5c1946d22..0c01debe963b 100644
--- a/arch/powerpc/sysdev/fsl_msi.c
+++ b/arch/powerpc/sysdev/fsl_msi.c
@@ -60,7 +60,7 @@ static struct irq_chip fsl_msi_chip = {
 	.name		= "FSL-MSI",
 };
 
-static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
+static int fsl_msi_host_map(struct irq_domain *h, unsigned int virq,
 				irq_hw_number_t hw)
 {
 	struct fsl_msi *msi_data = h->host_data;
@@ -74,7 +74,7 @@ static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static struct irq_host_ops fsl_msi_host_ops = {
+static const struct irq_domain_ops fsl_msi_host_ops = {
 	.map = fsl_msi_host_map,
 };
 
@@ -387,8 +387,8 @@ static int __devinit fsl_of_msi_probe(struct platform_device *dev)
 	}
 	platform_set_drvdata(dev, msi);
 
-	msi->irqhost = irq_alloc_host(dev->dev.of_node, IRQ_HOST_MAP_LINEAR,
-				      NR_MSI_IRQS, &fsl_msi_host_ops, 0);
+	msi->irqhost = irq_domain_add_linear(dev->dev.of_node,
+				      NR_MSI_IRQS, &fsl_msi_host_ops, msi);
 
 	if (msi->irqhost == NULL) {
 		dev_err(&dev->dev, "No memory for MSI irqhost\n");
@@ -420,8 +420,6 @@ static int __devinit fsl_of_msi_probe(struct platform_device *dev)
 
 	msi->feature = features->fsl_pic_ip;
 
-	msi->irqhost->host_data = msi;
-
 	/*
 	 * Remember the phandle, so that we can match with any PCI nodes
 	 * that have an "fsl,msi" property.
diff --git a/arch/powerpc/sysdev/fsl_msi.h b/arch/powerpc/sysdev/fsl_msi.h
index f6c646a52541..8225f8653f78 100644
--- a/arch/powerpc/sysdev/fsl_msi.h
+++ b/arch/powerpc/sysdev/fsl_msi.h
@@ -26,7 +26,7 @@
 #define FSL_PIC_IP_VMPIC  0x00000003
 
 struct fsl_msi {
-	struct irq_host *irqhost;
+	struct irq_domain *irqhost;
 
 	unsigned long cascade_irq;
 
diff --git a/arch/powerpc/sysdev/i8259.c b/arch/powerpc/sysdev/i8259.c
index d18bb27e4df9..997df6a7ab5d 100644
--- a/arch/powerpc/sysdev/i8259.c
+++ b/arch/powerpc/sysdev/i8259.c
@@ -25,7 +25,7 @@ static unsigned char cached_8259[2] = { 0xff, 0xff };
 
 static DEFINE_RAW_SPINLOCK(i8259_lock);
 
-static struct irq_host *i8259_host;
+static struct irq_domain *i8259_host;
 
 /*
  * Acknowledge the IRQ using either the PCI host bridge's interrupt
@@ -163,12 +163,12 @@ static struct resource pic_edgectrl_iores = {
 	.flags = IORESOURCE_BUSY,
 };
 
-static int i8259_host_match(struct irq_host *h, struct device_node *node)
+static int i8259_host_match(struct irq_domain *h, struct device_node *node)
 {
 	return h->of_node == NULL || h->of_node == node;
 }
 
-static int i8259_host_map(struct irq_host *h, unsigned int virq,
+static int i8259_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	pr_debug("i8259_host_map(%d, 0x%lx)\n", virq, hw);
@@ -185,7 +185,7 @@ static int i8259_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int i8259_host_xlate(struct irq_host *h, struct device_node *ct,
+static int i8259_host_xlate(struct irq_domain *h, struct device_node *ct,
 			    const u32 *intspec, unsigned int intsize,
 			    irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 {
@@ -205,13 +205,13 @@ static int i8259_host_xlate(struct irq_host *h, struct device_node *ct,
 	return 0;
 }
 
-static struct irq_host_ops i8259_host_ops = {
+static struct irq_domain_ops i8259_host_ops = {
 	.match = i8259_host_match,
 	.map = i8259_host_map,
 	.xlate = i8259_host_xlate,
 };
 
-struct irq_host *i8259_get_host(void)
+struct irq_domain *i8259_get_host(void)
 {
 	return i8259_host;
 }
@@ -263,8 +263,7 @@ void i8259_init(struct device_node *node, unsigned long intack_addr)
 	raw_spin_unlock_irqrestore(&i8259_lock, flags);
 
 	/* create a legacy host */
-	i8259_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,
-				    0, &i8259_host_ops, 0);
+	i8259_host = irq_domain_add_legacy_isa(node, &i8259_host_ops, NULL);
 	if (i8259_host == NULL) {
 		printk(KERN_ERR "i8259: failed to allocate irq host !\n");
 		return;
diff --git a/arch/powerpc/sysdev/ipic.c b/arch/powerpc/sysdev/ipic.c
index 95da897f05a7..b50f97811c25 100644
--- a/arch/powerpc/sysdev/ipic.c
+++ b/arch/powerpc/sysdev/ipic.c
@@ -672,13 +672,13 @@ static struct irq_chip ipic_edge_irq_chip = {
 	.irq_set_type	= ipic_set_irq_type,
 };
 
-static int ipic_host_match(struct irq_host *h, struct device_node *node)
+static int ipic_host_match(struct irq_domain *h, struct device_node *node)
 {
 	/* Exact match, unless ipic node is NULL */
 	return h->of_node == NULL || h->of_node == node;
 }
 
-static int ipic_host_map(struct irq_host *h, unsigned int virq,
+static int ipic_host_map(struct irq_domain *h, unsigned int virq,
 			 irq_hw_number_t hw)
 {
 	struct ipic *ipic = h->host_data;
@@ -692,26 +692,10 @@ static int ipic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int ipic_host_xlate(struct irq_host *h, struct device_node *ct,
-			   const u32 *intspec, unsigned int intsize,
-			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
-
-{
-	/* interrupt sense values coming from the device tree equal either
-	 * LEVEL_LOW (low assertion) or EDGE_FALLING (high-to-low change)
-	 */
-	*out_hwirq = intspec[0];
-	if (intsize > 1)
-		*out_flags = intspec[1];
-	else
-		*out_flags = IRQ_TYPE_NONE;
-	return 0;
-}
-
-static struct irq_host_ops ipic_host_ops = {
+static struct irq_domain_ops ipic_host_ops = {
 	.match	= ipic_host_match,
 	.map	= ipic_host_map,
-	.xlate	= ipic_host_xlate,
+	.xlate	= irq_domain_xlate_onetwocell,
 };
 
 struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
@@ -728,9 +712,8 @@ struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 	if (ipic == NULL)
 		return NULL;
 
-	ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
-				       NR_IPIC_INTS,
-				       &ipic_host_ops, 0);
+	ipic->irqhost = irq_domain_add_linear(node, NR_IPIC_INTS,
+					      &ipic_host_ops, ipic);
 	if (ipic->irqhost == NULL) {
 		kfree(ipic);
 		return NULL;
@@ -738,8 +721,6 @@ struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 
 	ipic->regs = ioremap(res.start, resource_size(&res));
 
-	ipic->irqhost->host_data = ipic;
-
 	/* init hw */
 	ipic_write(ipic->regs, IPIC_SICNR, 0x0);
 
diff --git a/arch/powerpc/sysdev/ipic.h b/arch/powerpc/sysdev/ipic.h
index 9391c57b0c51..90031d1282e1 100644
--- a/arch/powerpc/sysdev/ipic.h
+++ b/arch/powerpc/sysdev/ipic.h
@@ -43,7 +43,7 @@ struct ipic {
 	volatile u32 __iomem	*regs;
 
 	/* The remapper for this IPIC */
-	struct irq_host		*irqhost;
+	struct irq_domain		*irqhost;
 };
 
 struct ipic_info {
diff --git a/arch/powerpc/sysdev/mpc8xx_pic.c b/arch/powerpc/sysdev/mpc8xx_pic.c
index 2ca0a85fcce9..d5f5416be310 100644
--- a/arch/powerpc/sysdev/mpc8xx_pic.c
+++ b/arch/powerpc/sysdev/mpc8xx_pic.c
@@ -17,7 +17,7 @@
 
 extern int cpm_get_irq(struct pt_regs *regs);
 
-static struct irq_host *mpc8xx_pic_host;
+static struct irq_domain *mpc8xx_pic_host;
 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
 static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
 static sysconf8xx_t __iomem *siu_reg;
@@ -110,7 +110,7 @@ unsigned int mpc8xx_get_irq(void)
 
 }
 
-static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
+static int mpc8xx_pic_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
@@ -121,7 +121,7 @@ static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
 }
 
 
-static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
+static int mpc8xx_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
 			    const u32 *intspec, unsigned int intsize,
 			    irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 {
@@ -142,7 +142,7 @@ static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
 }
 
 
-static struct irq_host_ops mpc8xx_pic_host_ops = {
+static struct irq_domain_ops mpc8xx_pic_host_ops = {
 	.map = mpc8xx_pic_host_map,
 	.xlate = mpc8xx_pic_host_xlate,
 };
@@ -171,8 +171,7 @@ int mpc8xx_pic_init(void)
 		goto out;
 	}
 
-	mpc8xx_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
-					 64, &mpc8xx_pic_host_ops, 64);
+	mpc8xx_pic_host = irq_domain_add_linear(np, 64, &mpc8xx_pic_host_ops, NULL);
 	if (mpc8xx_pic_host == NULL) {
 		printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
 		ret = -ENOMEM;
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 4e9ccb1015de..c83a512fa175 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -965,13 +965,13 @@ static struct irq_chip mpic_irq_ht_chip = {
 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 
 
-static int mpic_host_match(struct irq_host *h, struct device_node *node)
+static int mpic_host_match(struct irq_domain *h, struct device_node *node)
 {
 	/* Exact match, unless mpic node is NULL */
 	return h->of_node == NULL || h->of_node == node;
 }
 
-static int mpic_host_map(struct irq_host *h, unsigned int virq,
+static int mpic_host_map(struct irq_domain *h, unsigned int virq,
 			 irq_hw_number_t hw)
 {
 	struct mpic *mpic = h->host_data;
@@ -1041,7 +1041,7 @@ static int mpic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
+static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct,
 			   const u32 *intspec, unsigned int intsize,
 			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 
@@ -1121,13 +1121,13 @@ static void mpic_cascade(unsigned int irq, struct irq_desc *desc)
 	BUG_ON(!(mpic->flags & MPIC_SECONDARY));
 
 	virq = mpic_get_one_irq(mpic);
-	if (virq != NO_IRQ)
+	if (virq)
 		generic_handle_irq(virq);
 
 	chip->irq_eoi(&desc->irq_data);
 }
 
-static struct irq_host_ops mpic_host_ops = {
+static struct irq_domain_ops mpic_host_ops = {
 	.match = mpic_host_match,
 	.map = mpic_host_map,
 	.xlate = mpic_host_xlate,
@@ -1345,10 +1345,9 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
 	mpic->isu_mask = (1 << mpic->isu_shift) - 1;
 
-	mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
+	mpic->irqhost = irq_domain_add_linear(mpic->node,
 				       isu_size ? isu_size : mpic->num_sources,
-				       &mpic_host_ops,
-				       flags & MPIC_LARGE_VECTORS ? 2048 : 256);
+				       &mpic_host_ops, mpic);
 
 	/*
 	 * FIXME: The code leaks the MPIC object and mappings here; this
@@ -1357,8 +1356,6 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	if (mpic->irqhost == NULL)
 		return NULL;
 
-	mpic->irqhost->host_data = mpic;
-
 	/* Display version */
 	switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
 	case 1:
diff --git a/arch/powerpc/sysdev/mpic_msi.c b/arch/powerpc/sysdev/mpic_msi.c
index 0f67cd79d481..0622aa91b18a 100644
--- a/arch/powerpc/sysdev/mpic_msi.c
+++ b/arch/powerpc/sysdev/mpic_msi.c
@@ -32,7 +32,7 @@ void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
 static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
 {
 	irq_hw_number_t hwirq;
-	struct irq_host_ops *ops = mpic->irqhost->ops;
+	const struct irq_domain_ops *ops = mpic->irqhost->ops;
 	struct device_node *np;
 	int flags, index, i;
 	struct of_irq oirq;
diff --git a/arch/powerpc/sysdev/mv64x60_pic.c b/arch/powerpc/sysdev/mv64x60_pic.c
index 14d130268e7a..8848e99a83f2 100644
--- a/arch/powerpc/sysdev/mv64x60_pic.c
+++ b/arch/powerpc/sysdev/mv64x60_pic.c
@@ -70,7 +70,7 @@ static u32 mv64x60_cached_low_mask;
 static u32 mv64x60_cached_high_mask = MV64X60_HIGH_GPP_GROUPS;
 static u32 mv64x60_cached_gpp_mask;
 
-static struct irq_host *mv64x60_irq_host;
+static struct irq_domain *mv64x60_irq_host;
 
 /*
  * mv64x60_chip_low functions
@@ -208,7 +208,7 @@ static struct irq_chip *mv64x60_chips[] = {
 	[MV64x60_LEVEL1_GPP]  = &mv64x60_chip_gpp,
 };
 
-static int mv64x60_host_map(struct irq_host *h, unsigned int virq,
+static int mv64x60_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hwirq)
 {
 	int level1;
@@ -223,7 +223,7 @@ static int mv64x60_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static struct irq_host_ops mv64x60_host_ops = {
+static struct irq_domain_ops mv64x60_host_ops = {
 	.map   = mv64x60_host_map,
 };
 
@@ -250,9 +250,8 @@ void __init mv64x60_init_irq(void)
 	paddr = of_translate_address(np, reg);
 	mv64x60_irq_reg_base = ioremap(paddr, reg[1]);
 
-	mv64x60_irq_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
-					  MV64x60_NUM_IRQS,
-					  &mv64x60_host_ops, MV64x60_NUM_IRQS);
+	mv64x60_irq_host = irq_domain_add_linear(np, MV64x60_NUM_IRQS,
+					  &mv64x60_host_ops, NULL);
 
 	spin_lock_irqsave(&mv64x60_lock, flags);
 	out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_INTR_MASK,
diff --git a/arch/powerpc/sysdev/qe_lib/qe_ic.c b/arch/powerpc/sysdev/qe_lib/qe_ic.c
index 73034bd203c4..2fba6ef2f95e 100644
--- a/arch/powerpc/sysdev/qe_lib/qe_ic.c
+++ b/arch/powerpc/sysdev/qe_lib/qe_ic.c
@@ -245,13 +245,13 @@ static struct irq_chip qe_ic_irq_chip = {
 	.irq_mask_ack = qe_ic_mask_irq,
 };
 
-static int qe_ic_host_match(struct irq_host *h, struct device_node *node)
+static int qe_ic_host_match(struct irq_domain *h, struct device_node *node)
 {
 	/* Exact match, unless qe_ic node is NULL */
 	return h->of_node == NULL || h->of_node == node;
 }
 
-static int qe_ic_host_map(struct irq_host *h, unsigned int virq,
+static int qe_ic_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {
 	struct qe_ic *qe_ic = h->host_data;
@@ -272,23 +272,10 @@ static int qe_ic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int qe_ic_host_xlate(struct irq_host *h, struct device_node *ct,
-			    const u32 * intspec, unsigned int intsize,
-			    irq_hw_number_t * out_hwirq,
-			    unsigned int *out_flags)
-{
-	*out_hwirq = intspec[0];
-	if (intsize > 1)
-		*out_flags = intspec[1];
-	else
-		*out_flags = IRQ_TYPE_NONE;
-	return 0;
-}
-
-static struct irq_host_ops qe_ic_host_ops = {
+static struct irq_domain_ops qe_ic_host_ops = {
 	.match = qe_ic_host_match,
 	.map = qe_ic_host_map,
-	.xlate = qe_ic_host_xlate,
+	.xlate = irq_domain_xlate_onetwocell,
 };
 
 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
@@ -339,8 +326,8 @@ void __init qe_ic_init(struct device_node *node, unsigned int flags,
 	if (qe_ic == NULL)
 		return;
 
-	qe_ic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
-					NR_QE_IC_INTS, &qe_ic_host_ops, 0);
+	qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
+					       &qe_ic_host_ops, qe_ic);
 	if (qe_ic->irqhost == NULL) {
 		kfree(qe_ic);
 		return;
@@ -348,7 +335,6 @@ void __init qe_ic_init(struct device_node *node, unsigned int flags,
 
 	qe_ic->regs = ioremap(res.start, resource_size(&res));
 
-	qe_ic->irqhost->host_data = qe_ic;
 	qe_ic->hc_irq = qe_ic_irq_chip;
 
 	qe_ic->virq_high = irq_of_parse_and_map(node, 0);
diff --git a/arch/powerpc/sysdev/qe_lib/qe_ic.h b/arch/powerpc/sysdev/qe_lib/qe_ic.h
index c1361d005a8a..c327872ed35c 100644
--- a/arch/powerpc/sysdev/qe_lib/qe_ic.h
+++ b/arch/powerpc/sysdev/qe_lib/qe_ic.h
@@ -79,7 +79,7 @@ struct qe_ic {
 	volatile u32 __iomem *regs;
 
 	/* The remapper for this QEIC */
-	struct irq_host *irqhost;
+	struct irq_domain *irqhost;
 
 	/* The "linux" controller struct */
 	struct irq_chip hc_irq;
diff --git a/arch/powerpc/sysdev/tsi108_pci.c b/arch/powerpc/sysdev/tsi108_pci.c
index 4d18658116e5..188012c58f7f 100644
--- a/arch/powerpc/sysdev/tsi108_pci.c
+++ b/arch/powerpc/sysdev/tsi108_pci.c
@@ -51,7 +51,7 @@
 u32 tsi108_pci_cfg_base;
 static u32 tsi108_pci_cfg_phys;
 u32 tsi108_csr_vir_base;
-static struct irq_host *pci_irq_host;
+static struct irq_domain *pci_irq_host;
 
 extern u32 get_vir_csrbase(void);
 extern u32 tsi108_read_reg(u32 reg_offset);
@@ -376,7 +376,7 @@ static struct irq_chip tsi108_pci_irq = {
 	.irq_unmask = tsi108_pci_irq_unmask,
 };
 
-static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
+static int pci_irq_host_xlate(struct irq_domain *h, struct device_node *ct,
 			    const u32 *intspec, unsigned int intsize,
 			    irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 {
@@ -385,7 +385,7 @@ static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
 	return 0;
 }
 
-static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
+static int pci_irq_host_map(struct irq_domain *h, unsigned int virq,
 			  irq_hw_number_t hw)
 {	unsigned int irq;
 	DBG("%s(%d, 0x%lx)\n", __func__, virq, hw);
@@ -397,7 +397,7 @@ static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static struct irq_host_ops pci_irq_host_ops = {
+static struct irq_domain_ops pci_irq_domain_ops = {
 	.map = pci_irq_host_map,
 	.xlate = pci_irq_host_xlate,
 };
@@ -419,10 +419,9 @@ void __init tsi108_pci_int_init(struct device_node *node)
 {
 	DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
 
-	pci_irq_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,
-				      0, &pci_irq_host_ops, 0);
+	pci_irq_host = irq_domain_add_legacy_isa(node, &pci_irq_domain_ops, NULL);
 	if (pci_irq_host == NULL) {
-		printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
+		printk(KERN_ERR "pci_irq_host: failed to allocate irq domain!\n");
 		return;
 	}
 
diff --git a/arch/powerpc/sysdev/uic.c b/arch/powerpc/sysdev/uic.c
index 063c901b1265..92033936a8f7 100644
--- a/arch/powerpc/sysdev/uic.c
+++ b/arch/powerpc/sysdev/uic.c
@@ -49,7 +49,7 @@ struct uic {
 	raw_spinlock_t lock;
 
 	/* The remapper for this UIC */
-	struct irq_host	*irqhost;
+	struct irq_domain	*irqhost;
 };
 
 static void uic_unmask_irq(struct irq_data *d)
@@ -174,7 +174,7 @@ static struct irq_chip uic_irq_chip = {
 	.irq_set_type	= uic_set_irq_type,
 };
 
-static int uic_host_map(struct irq_host *h, unsigned int virq,
+static int uic_host_map(struct irq_domain *h, unsigned int virq,
 			irq_hw_number_t hw)
 {
 	struct uic *uic = h->host_data;
@@ -190,21 +190,9 @@ static int uic_host_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static int uic_host_xlate(struct irq_host *h, struct device_node *ct,
-			  const u32 *intspec, unsigned int intsize,
-			  irq_hw_number_t *out_hwirq, unsigned int *out_type)
-
-{
-	/* UIC intspecs must have 2 cells */
-	BUG_ON(intsize != 2);
-	*out_hwirq = intspec[0];
-	*out_type = intspec[1];
-	return 0;
-}
-
-static struct irq_host_ops uic_host_ops = {
+static struct irq_domain_ops uic_host_ops = {
 	.map	= uic_host_map,
-	.xlate	= uic_host_xlate,
+	.xlate	= irq_domain_xlate_twocell,
 };
 
 void uic_irq_cascade(unsigned int virq, struct irq_desc *desc)
@@ -270,13 +258,11 @@ static struct uic * __init uic_init_one(struct device_node *node)
 	}
 	uic->dcrbase = *dcrreg;
 
-	uic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
-				      NR_UIC_INTS, &uic_host_ops, -1);
+	uic->irqhost = irq_domain_add_linear(node, NR_UIC_INTS, &uic_host_ops,
+					     uic);
 	if (! uic->irqhost)
 		return NULL; /* FIXME: panic? */
 
-	uic->irqhost->host_data = uic;
-
 	/* Start with all interrupts disabled, level and non-critical */
 	mtdcr(uic->dcrbase + UIC_ER, 0);
 	mtdcr(uic->dcrbase + UIC_CR, 0);
diff --git a/arch/powerpc/sysdev/xics/xics-common.c b/arch/powerpc/sysdev/xics/xics-common.c
index d72eda6a4c05..ea5e204e3450 100644
--- a/arch/powerpc/sysdev/xics/xics-common.c
+++ b/arch/powerpc/sysdev/xics/xics-common.c
@@ -40,7 +40,7 @@ unsigned int xics_interrupt_server_size		= 8;
 
 DEFINE_PER_CPU(struct xics_cppr, xics_cppr);
 
-struct irq_host *xics_host;
+struct irq_domain *xics_host;
 
 static LIST_HEAD(ics_list);
 
@@ -212,16 +212,16 @@ void xics_migrate_irqs_away(void)
 		/* We can't set affinity on ISA interrupts */
 		if (virq < NUM_ISA_INTERRUPTS)
 			continue;
-		if (!virq_is_host(virq, xics_host))
-			continue;
-		irq = (unsigned int)virq_to_hw(virq);
-		/* We need to get IPIs still. */
-		if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
-			continue;
 		desc = irq_to_desc(virq);
 		/* We only need to migrate enabled IRQS */
 		if (!desc || !desc->action)
 			continue;
+		if (desc->irq_data.domain != xics_host)
+			continue;
+		irq = desc->irq_data.hwirq;
+		/* We need to get IPIs still. */
+		if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
+			continue;
 		chip = irq_desc_get_chip(desc);
 		if (!chip || !chip->irq_set_affinity)
 			continue;
@@ -301,7 +301,7 @@ int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
 }
 #endif /* CONFIG_SMP */
 
-static int xics_host_match(struct irq_host *h, struct device_node *node)
+static int xics_host_match(struct irq_domain *h, struct device_node *node)
 {
 	struct ics *ics;
 
@@ -323,7 +323,7 @@ static struct irq_chip xics_ipi_chip = {
 	.irq_unmask = xics_ipi_unmask,
 };
 
-static int xics_host_map(struct irq_host *h, unsigned int virq,
+static int xics_host_map(struct irq_domain *h, unsigned int virq,
 			 irq_hw_number_t hw)
 {
 	struct ics *ics;
@@ -351,7 +351,7 @@ static int xics_host_map(struct irq_host *h, unsigned int virq,
 	return -EINVAL;
 }
 
-static int xics_host_xlate(struct irq_host *h, struct device_node *ct,
+static int xics_host_xlate(struct irq_domain *h, struct device_node *ct,
 			   const u32 *intspec, unsigned int intsize,
 			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 
@@ -366,7 +366,7 @@ static int xics_host_xlate(struct irq_host *h, struct device_node *ct,
 	return 0;
 }
 
-static struct irq_host_ops xics_host_ops = {
+static struct irq_domain_ops xics_host_ops = {
 	.match = xics_host_match,
 	.map = xics_host_map,
 	.xlate = xics_host_xlate,
@@ -374,8 +374,7 @@ static struct irq_host_ops xics_host_ops = {
 
 static void __init xics_init_host(void)
 {
-	xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, &xics_host_ops,
-				   XICS_IRQ_SPURIOUS);
+	xics_host = irq_domain_add_tree(NULL, &xics_host_ops, NULL);
 	BUG_ON(xics_host == NULL);
 	irq_set_default_host(xics_host);
 }
diff --git a/arch/powerpc/sysdev/xilinx_intc.c b/arch/powerpc/sysdev/xilinx_intc.c
index 6183799754af..8d73c3c0bee6 100644
--- a/arch/powerpc/sysdev/xilinx_intc.c
+++ b/arch/powerpc/sysdev/xilinx_intc.c
@@ -40,7 +40,7 @@
 #define XINTC_IVR	24	/* Interrupt Vector */
 #define XINTC_MER	28	/* Master Enable */
 
-static struct irq_host *master_irqhost;
+static struct irq_domain *master_irqhost;
 
 #define XILINX_INTC_MAXIRQS	(32)
 
@@ -141,7 +141,7 @@ static struct irq_chip xilinx_intc_edge_irqchip = {
 /**
  * xilinx_intc_xlate - translate virq# from device tree interrupts property
  */
-static int xilinx_intc_xlate(struct irq_host *h, struct device_node *ct,
+static int xilinx_intc_xlate(struct irq_domain *h, struct device_node *ct,
 				const u32 *intspec, unsigned int intsize,
 				irq_hw_number_t *out_hwirq,
 				unsigned int *out_flags)
@@ -161,7 +161,7 @@ static int xilinx_intc_xlate(struct irq_host *h, struct device_node *ct,
 
 	return 0;
 }
-static int xilinx_intc_map(struct irq_host *h, unsigned int virq,
+static int xilinx_intc_map(struct irq_domain *h, unsigned int virq,
 				  irq_hw_number_t irq)
 {
 	irq_set_chip_data(virq, h->host_data);
@@ -177,15 +177,15 @@ static int xilinx_intc_map(struct irq_host *h, unsigned int virq,
 	return 0;
 }
 
-static struct irq_host_ops xilinx_intc_ops = {
+static struct irq_domain_ops xilinx_intc_ops = {
 	.map = xilinx_intc_map,
 	.xlate = xilinx_intc_xlate,
 };
 
-struct irq_host * __init
+struct irq_domain * __init
 xilinx_intc_init(struct device_node *np)
 {
-	struct irq_host * irq;
+	struct irq_domain * irq;
 	void * regs;
 
 	/* Find and map the intc registers */
@@ -200,12 +200,11 @@ xilinx_intc_init(struct device_node *np)
 	out_be32(regs + XINTC_IAR, ~(u32) 0); /* Acknowledge pending irqs */
 	out_be32(regs + XINTC_MER, 0x3UL); /* Turn on the Master Enable. */
 
-	/* Allocate and initialize an irq_host structure. */
-	irq = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, XILINX_INTC_MAXIRQS,
-			     &xilinx_intc_ops, -1);
+	/* Allocate and initialize an irq_domain structure. */
+	irq = irq_domain_add_linear(np, XILINX_INTC_MAXIRQS, &xilinx_intc_ops,
+				    regs);
 	if (!irq)
 		panic(__FILE__ ": Cannot allocate IRQ host\n");
-	irq->host_data = regs;
 
 	return irq;
 }