sh: Move the shared INTC code out to drivers/sh/

The INTC code will be re-used across different architectures, so move
this out to drivers/sh/ and include/linux/sh_intc.h respectively.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 714 insertions, 1 deletions

diff --git a/drivers/sh/Makefile b/drivers/sh/Makefile
index a96f4a8cfeb8..6a025cefe6dc 100644
--- a/drivers/sh/Makefile
+++ b/drivers/sh/Makefile
@@ -1,6 +1,6 @@
 #
 # Makefile for the SuperH specific drivers.
 #
-
 obj-$(CONFIG_SUPERHYWAY)	+= superhyway/
 obj-$(CONFIG_MAPLE)		+= maple/
+obj-y				+= intc.o
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
new file mode 100644
index 000000000000..58d24c5a76ce
--- /dev/null
+++ b/drivers/sh/intc.c
@@ -0,0 +1,713 @@
+/*
+ * Shared interrupt handling code for IPR and INTC2 types of IRQs.
+ *
+ * Copyright (C) 2007, 2008 Magnus Damm
+ *
+ * Based on intc2.c and ipr.c
+ *
+ * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
+ * Copyright (C) 2000  Kazumoto Kojima
+ * Copyright (C) 2001  David J. Mckay (david.mckay@st.com)
+ * Copyright (C) 2003  Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
+ * Copyright (C) 2005, 2006  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/bootmem.h>
+#include <linux/sh_intc.h>
+
+#define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \
+	((shift) | ((width) << 5) | ((fn) << 9) | ((mode) << 13) | \
+	 ((addr_e) << 16) | ((addr_d << 24)))
+
+#define _INTC_SHIFT(h) (h & 0x1f)
+#define _INTC_WIDTH(h) ((h >> 5) & 0xf)
+#define _INTC_FN(h) ((h >> 9) & 0xf)
+#define _INTC_MODE(h) ((h >> 13) & 0x7)
+#define _INTC_ADDR_E(h) ((h >> 16) & 0xff)
+#define _INTC_ADDR_D(h) ((h >> 24) & 0xff)
+
+struct intc_handle_int {
+	unsigned int irq;
+	unsigned long handle;
+};
+
+struct intc_desc_int {
+	unsigned long *reg;
+#ifdef CONFIG_SMP
+	unsigned long *smp;
+#endif
+	unsigned int nr_reg;
+	struct intc_handle_int *prio;
+	unsigned int nr_prio;
+	struct intc_handle_int *sense;
+	unsigned int nr_sense;
+	struct irq_chip chip;
+};
+
+#ifdef CONFIG_SMP
+#define IS_SMP(x) x.smp
+#define INTC_REG(d, x, c) (d->reg[(x)] + ((d->smp[(x)] & 0xff) * c))
+#define SMP_NR(d, x) ((d->smp[(x)] >> 8) ? (d->smp[(x)] >> 8) : 1)
+#else
+#define IS_SMP(x) 0
+#define INTC_REG(d, x, c) (d->reg[(x)])
+#define SMP_NR(d, x) 1
+#endif
+
+static unsigned int intc_prio_level[NR_IRQS]; /* for now */
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+static unsigned long ack_handle[NR_IRQS];
+#endif
+
+static inline struct intc_desc_int *get_intc_desc(unsigned int irq)
+{
+	struct irq_chip *chip = get_irq_chip(irq);
+	return (void *)((char *)chip - offsetof(struct intc_desc_int, chip));
+}
+
+static inline unsigned int set_field(unsigned int value,
+				     unsigned int field_value,
+				     unsigned int handle)
+{
+	unsigned int width = _INTC_WIDTH(handle);
+	unsigned int shift = _INTC_SHIFT(handle);
+
+	value &= ~(((1 << width) - 1) << shift);
+	value |= field_value << shift;
+	return value;
+}
+
+static void write_8(unsigned long addr, unsigned long h, unsigned long data)
+{
+	__raw_writeb(set_field(0, data, h), addr);
+}
+
+static void write_16(unsigned long addr, unsigned long h, unsigned long data)
+{
+	__raw_writew(set_field(0, data, h), addr);
+}
+
+static void write_32(unsigned long addr, unsigned long h, unsigned long data)
+{
+	__raw_writel(set_field(0, data, h), addr);
+}
+
+static void modify_8(unsigned long addr, unsigned long h, unsigned long data)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	__raw_writeb(set_field(__raw_readb(addr), data, h), addr);
+	local_irq_restore(flags);
+}
+
+static void modify_16(unsigned long addr, unsigned long h, unsigned long data)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	__raw_writew(set_field(__raw_readw(addr), data, h), addr);
+	local_irq_restore(flags);
+}
+
+static void modify_32(unsigned long addr, unsigned long h, unsigned long data)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	__raw_writel(set_field(__raw_readl(addr), data, h), addr);
+	local_irq_restore(flags);
+}
+
+enum {	REG_FN_ERR = 0, REG_FN_WRITE_BASE = 1, REG_FN_MODIFY_BASE = 5 };
+
+static void (*intc_reg_fns[])(unsigned long addr,
+			      unsigned long h,
+			      unsigned long data) = {
+	[REG_FN_WRITE_BASE + 0] = write_8,
+	[REG_FN_WRITE_BASE + 1] = write_16,
+	[REG_FN_WRITE_BASE + 3] = write_32,
+	[REG_FN_MODIFY_BASE + 0] = modify_8,
+	[REG_FN_MODIFY_BASE + 1] = modify_16,
+	[REG_FN_MODIFY_BASE + 3] = modify_32,
+};
+
+enum {	MODE_ENABLE_REG = 0, /* Bit(s) set -> interrupt enabled */
+	MODE_MASK_REG,       /* Bit(s) set -> interrupt disabled */
+	MODE_DUAL_REG,       /* Two registers, set bit to enable / disable */
+	MODE_PRIO_REG,       /* Priority value written to enable interrupt */
+	MODE_PCLR_REG,       /* Above plus all bits set to disable interrupt */
+};
+
+static void intc_mode_field(unsigned long addr,
+			    unsigned long handle,
+			    void (*fn)(unsigned long,
+				       unsigned long,
+				       unsigned long),
+			    unsigned int irq)
+{
+	fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
+}
+
+static void intc_mode_zero(unsigned long addr,
+			   unsigned long handle,
+			   void (*fn)(unsigned long,
+				       unsigned long,
+				       unsigned long),
+			   unsigned int irq)
+{
+	fn(addr, handle, 0);
+}
+
+static void intc_mode_prio(unsigned long addr,
+			   unsigned long handle,
+			   void (*fn)(unsigned long,
+				       unsigned long,
+				       unsigned long),
+			   unsigned int irq)
+{
+	fn(addr, handle, intc_prio_level[irq]);
+}
+
+static void (*intc_enable_fns[])(unsigned long addr,
+				 unsigned long handle,
+				 void (*fn)(unsigned long,
+					    unsigned long,
+					    unsigned long),
+				 unsigned int irq) = {
+	[MODE_ENABLE_REG] = intc_mode_field,
+	[MODE_MASK_REG] = intc_mode_zero,
+	[MODE_DUAL_REG] = intc_mode_field,
+	[MODE_PRIO_REG] = intc_mode_prio,
+	[MODE_PCLR_REG] = intc_mode_prio,
+};
+
+static void (*intc_disable_fns[])(unsigned long addr,
+				  unsigned long handle,
+				  void (*fn)(unsigned long,
+					     unsigned long,
+					     unsigned long),
+				  unsigned int irq) = {
+	[MODE_ENABLE_REG] = intc_mode_zero,
+	[MODE_MASK_REG] = intc_mode_field,
+	[MODE_DUAL_REG] = intc_mode_field,
+	[MODE_PRIO_REG] = intc_mode_zero,
+	[MODE_PCLR_REG] = intc_mode_field,
+};
+
+static inline void _intc_enable(unsigned int irq, unsigned long handle)
+{
+	struct intc_desc_int *d = get_intc_desc(irq);
+	unsigned long addr;
+	unsigned int cpu;
+
+	for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
+		addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
+		intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
+						    [_INTC_FN(handle)], irq);
+	}
+}
+
+static void intc_enable(unsigned int irq)
+{
+	_intc_enable(irq, (unsigned long)get_irq_chip_data(irq));
+}
+
+static void intc_disable(unsigned int irq)
+{
+	struct intc_desc_int *d = get_intc_desc(irq);
+	unsigned long handle = (unsigned long) get_irq_chip_data(irq);
+	unsigned long addr;
+	unsigned int cpu;
+
+	for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
+		addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
+		intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
+						     [_INTC_FN(handle)], irq);
+	}
+}
+
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+static void intc_mask_ack(unsigned int irq)
+{
+	struct intc_desc_int *d = get_intc_desc(irq);
+	unsigned long handle = ack_handle[irq];
+	unsigned long addr;
+
+	intc_disable(irq);
+
+	/* read register and write zero only to the assocaited bit */
+
+	if (handle) {
+		addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
+		switch (_INTC_FN(handle)) {
+		case REG_FN_MODIFY_BASE + 0:	/* 8bit */
+			__raw_readb(addr);
+			__raw_writeb(0xff ^ set_field(0, 1, handle), addr);
+			break;
+		case REG_FN_MODIFY_BASE + 1:	/* 16bit */
+			__raw_readw(addr);
+			__raw_writew(0xffff ^ set_field(0, 1, handle), addr);
+			break;
+		case REG_FN_MODIFY_BASE + 3:	/* 32bit */
+			__raw_readl(addr);
+			__raw_writel(0xffffffff ^ set_field(0, 1, handle), addr);
+			break;
+		default:
+			BUG();
+			break;
+		}
+	}
+}
+#endif
+
+static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
+					     unsigned int nr_hp,
+					     unsigned int irq)
+{
+	int i;
+
+	/* this doesn't scale well, but...
+	 *
+	 * this function should only be used for cerain uncommon
+	 * operations such as intc_set_priority() and intc_set_sense()
+	 * and in those rare cases performance doesn't matter that much.
+	 * keeping the memory footprint low is more important.
+	 *
+	 * one rather simple way to speed this up and still keep the
+	 * memory footprint down is to make sure the array is sorted
+	 * and then perform a bisect to lookup the irq.
+	 */
+
+	for (i = 0; i < nr_hp; i++) {
+		if ((hp + i)->irq != irq)
+			continue;
+
+		return hp + i;
+	}
+
+	return NULL;
+}
+
+int intc_set_priority(unsigned int irq, unsigned int prio)
+{
+	struct intc_desc_int *d = get_intc_desc(irq);
+	struct intc_handle_int *ihp;
+
+	if (!intc_prio_level[irq] || prio <= 1)
+		return -EINVAL;
+
+	ihp = intc_find_irq(d->prio, d->nr_prio, irq);
+	if (ihp) {
+		if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
+			return -EINVAL;
+
+		intc_prio_level[irq] = prio;
+
+		/*
+		 * only set secondary masking method directly
+		 * primary masking method is using intc_prio_level[irq]
+		 * priority level will be set during next enable()
+		 */
+
+		if (_INTC_FN(ihp->handle) != REG_FN_ERR)
+			_intc_enable(irq, ihp->handle);
+	}
+	return 0;
+}
+
+#define VALID(x) (x | 0x80)
+
+static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
+	[IRQ_TYPE_EDGE_FALLING] = VALID(0),
+	[IRQ_TYPE_EDGE_RISING] = VALID(1),
+	[IRQ_TYPE_LEVEL_LOW] = VALID(2),
+	/* SH7706, SH7707 and SH7709 do not support high level triggered */
+#if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
+    !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
+    !defined(CONFIG_CPU_SUBTYPE_SH7709)
+	[IRQ_TYPE_LEVEL_HIGH] = VALID(3),
+#endif
+};
+
+static int intc_set_sense(unsigned int irq, unsigned int type)
+{
+	struct intc_desc_int *d = get_intc_desc(irq);
+	unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
+	struct intc_handle_int *ihp;
+	unsigned long addr;
+
+	if (!value)
+		return -EINVAL;
+
+	ihp = intc_find_irq(d->sense, d->nr_sense, irq);
+	if (ihp) {
+		addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
+		intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value);
+	}
+	return 0;
+}
+
+static unsigned int __init intc_get_reg(struct intc_desc_int *d,
+				 unsigned long address)
+{
+	unsigned int k;
+
+	for (k = 0; k < d->nr_reg; k++) {
+		if (d->reg[k] == address)
+			return k;
+	}
+
+	BUG();
+	return 0;
+}
+
+static intc_enum __init intc_grp_id(struct intc_desc *desc,
+				    intc_enum enum_id)
+{
+	struct intc_group *g = desc->groups;
+	unsigned int i, j;
+
+	for (i = 0; g && enum_id && i < desc->nr_groups; i++) {
+		g = desc->groups + i;
+
+		for (j = 0; g->enum_ids[j]; j++) {
+			if (g->enum_ids[j] != enum_id)
+				continue;
+
+			return g->enum_id;
+		}
+	}
+
+	return 0;
+}
+
+static unsigned int __init intc_mask_data(struct intc_desc *desc,
+					  struct intc_desc_int *d,
+					  intc_enum enum_id, int do_grps)
+{
+	struct intc_mask_reg *mr = desc->mask_regs;
+	unsigned int i, j, fn, mode;
+	unsigned long reg_e, reg_d;
+
+	for (i = 0; mr && enum_id && i < desc->nr_mask_regs; i++) {
+		mr = desc->mask_regs + i;
+
+		for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) {
+			if (mr->enum_ids[j] != enum_id)
+				continue;
+
+			if (mr->set_reg && mr->clr_reg) {
+				fn = REG_FN_WRITE_BASE;
+				mode = MODE_DUAL_REG;
+				reg_e = mr->clr_reg;
+				reg_d = mr->set_reg;
+			} else {
+				fn = REG_FN_MODIFY_BASE;
+				if (mr->set_reg) {
+					mode = MODE_ENABLE_REG;
+					reg_e = mr->set_reg;
+					reg_d = mr->set_reg;
+				} else {
+					mode = MODE_MASK_REG;
+					reg_e = mr->clr_reg;
+					reg_d = mr->clr_reg;
+				}
+			}
+
+			fn += (mr->reg_width >> 3) - 1;
+			return _INTC_MK(fn, mode,
+					intc_get_reg(d, reg_e),
+					intc_get_reg(d, reg_d),
+					1,
+					(mr->reg_width - 1) - j);
+		}
+	}
+
+	if (do_grps)
+		return intc_mask_data(desc, d, intc_grp_id(desc, enum_id), 0);
+
+	return 0;
+}
+
+static unsigned int __init intc_prio_data(struct intc_desc *desc,
+					  struct intc_desc_int *d,
+					  intc_enum enum_id, int do_grps)
+{
+	struct intc_prio_reg *pr = desc->prio_regs;
+	unsigned int i, j, fn, mode, bit;
+	unsigned long reg_e, reg_d;
+
+	for (i = 0; pr && enum_id && i < desc->nr_prio_regs; i++) {
+		pr = desc->prio_regs + i;
+
+		for (j = 0; j < ARRAY_SIZE(pr->enum_ids); j++) {
+			if (pr->enum_ids[j] != enum_id)
+				continue;
+
+			if (pr->set_reg && pr->clr_reg) {
+				fn = REG_FN_WRITE_BASE;
+				mode = MODE_PCLR_REG;
+				reg_e = pr->set_reg;
+				reg_d = pr->clr_reg;
+			} else {
+				fn = REG_FN_MODIFY_BASE;
+				mode = MODE_PRIO_REG;
+				if (!pr->set_reg)
+					BUG();
+				reg_e = pr->set_reg;
+				reg_d = pr->set_reg;
+			}
+
+			fn += (pr->reg_width >> 3) - 1;
+
+			BUG_ON((j + 1) * pr->field_width > pr->reg_width);
+
+			bit = pr->reg_width - ((j + 1) * pr->field_width);
+
+			return _INTC_MK(fn, mode,
+					intc_get_reg(d, reg_e),
+					intc_get_reg(d, reg_d),
+					pr->field_width, bit);
+		}
+	}
+
+	if (do_grps)
+		return intc_prio_data(desc, d, intc_grp_id(desc, enum_id), 0);
+
+	return 0;
+}
+
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+static unsigned int __init intc_ack_data(struct intc_desc *desc,
+					  struct intc_desc_int *d,
+					  intc_enum enum_id)
+{
+	struct intc_mask_reg *mr = desc->ack_regs;
+	unsigned int i, j, fn, mode;
+	unsigned long reg_e, reg_d;
+
+	for (i = 0; mr && enum_id && i < desc->nr_ack_regs; i++) {
+		mr = desc->ack_regs + i;
+
+		for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) {
+			if (mr->enum_ids[j] != enum_id)
+				continue;
+
+			fn = REG_FN_MODIFY_BASE;
+			mode = MODE_ENABLE_REG;
+			reg_e = mr->set_reg;
+			reg_d = mr->set_reg;
+
+			fn += (mr->reg_width >> 3) - 1;
+			return _INTC_MK(fn, mode,
+					intc_get_reg(d, reg_e),
+					intc_get_reg(d, reg_d),
+					1,
+					(mr->reg_width - 1) - j);
+		}
+	}
+
+	return 0;
+}
+#endif
+
+static unsigned int __init intc_sense_data(struct intc_desc *desc,
+					   struct intc_desc_int *d,
+					   intc_enum enum_id)
+{
+	struct intc_sense_reg *sr = desc->sense_regs;
+	unsigned int i, j, fn, bit;
+
+	for (i = 0; sr && enum_id && i < desc->nr_sense_regs; i++) {
+		sr = desc->sense_regs + i;
+
+		for (j = 0; j < ARRAY_SIZE(sr->enum_ids); j++) {
+			if (sr->enum_ids[j] != enum_id)
+				continue;
+
+			fn = REG_FN_MODIFY_BASE;
+			fn += (sr->reg_width >> 3) - 1;
+
+			BUG_ON((j + 1) * sr->field_width > sr->reg_width);
+
+			bit = sr->reg_width - ((j + 1) * sr->field_width);
+
+			return _INTC_MK(fn, 0, intc_get_reg(d, sr->reg),
+					0, sr->field_width, bit);
+		}
+	}
+
+	return 0;
+}
+
+static void __init intc_register_irq(struct intc_desc *desc,
+				     struct intc_desc_int *d,
+				     intc_enum enum_id,
+				     unsigned int irq)
+{
+	struct intc_handle_int *hp;
+	unsigned int data[2], primary;
+
+	/* Prefer single interrupt source bitmap over other combinations:
+	 * 1. bitmap, single interrupt source
+	 * 2. priority, single interrupt source
+	 * 3. bitmap, multiple interrupt sources (groups)
+	 * 4. priority, multiple interrupt sources (groups)
+	 */
+
+	data[0] = intc_mask_data(desc, d, enum_id, 0);
+	data[1] = intc_prio_data(desc, d, enum_id, 0);
+
+	primary = 0;
+	if (!data[0] && data[1])
+		primary = 1;
+
+	data[0] = data[0] ? data[0] : intc_mask_data(desc, d, enum_id, 1);
+	data[1] = data[1] ? data[1] : intc_prio_data(desc, d, enum_id, 1);
+
+	if (!data[primary])
+		primary ^= 1;
+
+	BUG_ON(!data[primary]); /* must have primary masking method */
+
+	disable_irq_nosync(irq);
+	set_irq_chip_and_handler_name(irq, &d->chip,
+				      handle_level_irq, "level");
+	set_irq_chip_data(irq, (void *)data[primary]);
+
+	/* set priority level
+	 * - this needs to be at least 2 for 5-bit priorities on 7780
+	 */
+	intc_prio_level[irq] = 2;
+
+	/* enable secondary masking method if present */
+	if (data[!primary])
+		_intc_enable(irq, data[!primary]);
+
+	/* add irq to d->prio list if priority is available */
+	if (data[1]) {
+		hp = d->prio + d->nr_prio;
+		hp->irq = irq;
+		hp->handle = data[1];
+
+		if (primary) {
+			/*
+			 * only secondary priority should access registers, so
+			 * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
+			 */
+
+			hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
+			hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
+		}
+		d->nr_prio++;
+	}
+
+	/* add irq to d->sense list if sense is available */
+	data[0] = intc_sense_data(desc, d, enum_id);
+	if (data[0]) {
+		(d->sense + d->nr_sense)->irq = irq;
+		(d->sense + d->nr_sense)->handle = data[0];
+		d->nr_sense++;
+	}
+
+	/* irq should be disabled by default */
+	d->chip.mask(irq);
+
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+	if (desc->ack_regs)
+		ack_handle[irq] = intc_ack_data(desc, d, enum_id);
+#endif
+}
+
+static unsigned int __init save_reg(struct intc_desc_int *d,
+				    unsigned int cnt,
+				    unsigned long value,
+				    unsigned int smp)
+{
+	if (value) {
+		d->reg[cnt] = value;
+#ifdef CONFIG_SMP
+		d->smp[cnt] = smp;
+#endif
+		return 1;
+	}
+
+	return 0;
+}
+
+
+void __init register_intc_controller(struct intc_desc *desc)
+{
+	unsigned int i, k, smp;
+	struct intc_desc_int *d;
+
+	d = alloc_bootmem(sizeof(*d));
+
+	d->nr_reg = desc->mask_regs ? desc->nr_mask_regs * 2 : 0;
+	d->nr_reg += desc->prio_regs ? desc->nr_prio_regs * 2 : 0;
+	d->nr_reg += desc->sense_regs ? desc->nr_sense_regs : 0;
+
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+	d->nr_reg += desc->ack_regs ? desc->nr_ack_regs : 0;
+#endif
+	d->reg = alloc_bootmem(d->nr_reg * sizeof(*d->reg));
+#ifdef CONFIG_SMP
+	d->smp = alloc_bootmem(d->nr_reg * sizeof(*d->smp));
+#endif
+	k = 0;
+
+	if (desc->mask_regs) {
+		for (i = 0; i < desc->nr_mask_regs; i++) {
+			smp = IS_SMP(desc->mask_regs[i]);
+			k += save_reg(d, k, desc->mask_regs[i].set_reg, smp);
+			k += save_reg(d, k, desc->mask_regs[i].clr_reg, smp);
+		}
+	}
+
+	if (desc->prio_regs) {
+		d->prio = alloc_bootmem(desc->nr_vectors * sizeof(*d->prio));
+
+		for (i = 0; i < desc->nr_prio_regs; i++) {
+			smp = IS_SMP(desc->prio_regs[i]);
+			k += save_reg(d, k, desc->prio_regs[i].set_reg, smp);
+			k += save_reg(d, k, desc->prio_regs[i].clr_reg, smp);
+		}
+	}
+
+	if (desc->sense_regs) {
+		d->sense = alloc_bootmem(desc->nr_vectors * sizeof(*d->sense));
+
+		for (i = 0; i < desc->nr_sense_regs; i++) {
+			k += save_reg(d, k, desc->sense_regs[i].reg, 0);
+		}
+	}
+
+	d->chip.name = desc->name;
+	d->chip.mask = intc_disable;
+	d->chip.unmask = intc_enable;
+	d->chip.mask_ack = intc_disable;
+	d->chip.set_type = intc_set_sense;
+
+#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4A)
+	if (desc->ack_regs) {
+		for (i = 0; i < desc->nr_ack_regs; i++)
+			k += save_reg(d, k, desc->ack_regs[i].set_reg, 0);
+
+		d->chip.mask_ack = intc_mask_ack;
+	}
+#endif
+
+	BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
+
+	for (i = 0; i < desc->nr_vectors; i++) {
+		struct intc_vect *vect = desc->vectors + i;
+
+		intc_register_irq(desc, d, vect->enum_id, evt2irq(vect->vect));
+	}
+}