linux/drivers/sh/intc.c

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/*
* 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;
if (!data[0] && !data[1])
pr_warning("intc: missing unique irq mask for "
"irq %d (vect 0x%04x)\n", irq, irq2evt(irq));
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;
}
static unsigned char *intc_evt2irq_table;
unsigned int intc_evt2irq(unsigned int vector)
{
unsigned int irq = evt2irq(vector);
if (intc_evt2irq_table && intc_evt2irq_table[irq])
irq = intc_evt2irq_table[irq];
return irq;
}
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 */
/* keep the first vector only if same enum is used multiple times */
for (i = 0; i < desc->nr_vectors; i++) {
struct intc_vect *vect = desc->vectors + i;
int first_irq = evt2irq(vect->vect);
if (!vect->enum_id)
continue;
for (k = i + 1; k < desc->nr_vectors; k++) {
struct intc_vect *vect2 = desc->vectors + k;
if (vect->enum_id != vect2->enum_id)
continue;
vect2->enum_id = 0;
if (!intc_evt2irq_table)
intc_evt2irq_table = alloc_bootmem(NR_IRQS);
if (!intc_evt2irq_table) {
pr_warning("intc: cannot allocate evt2irq!\n");
continue;
}
intc_evt2irq_table[evt2irq(vect2->vect)] = first_irq;
}
}
/* register the vectors one by one */
for (i = 0; i < desc->nr_vectors; i++) {
struct intc_vect *vect = desc->vectors + i;
if (!vect->enum_id)
continue;
intc_register_irq(desc, d, vect->enum_id, evt2irq(vect->vect));
}
}