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));
+        }
+}