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linux-brain/arch/mips/bcm63xx/irq.c
Paul Gortmaker 26dd3e4ff9 MIPS: Audit and remove any unnecessary uses of module.h 
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  In the case of
some code where it is modular, we can extend that to also include
files that are building basic support functionality but not related
to loading or registering the final module; such files also have
no need whatsoever for module.h

The advantage in removing such instances is that module.h itself
sources about 15 other headers; adding significantly to what we feed
cpp, and it can obscure what headers we are effectively using.

Since module.h might have been the implicit source for init.h
(for __init) and for export.h (for EXPORT_SYMBOL) we consider each
instance for the presence of either and replace/add as needed.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

Build coverage of all the mips defconfigs revealed the module.h
header was masking a couple of implicit include instances, so
we add the appropriate headers there.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: David Daney <david.daney@cavium.com>
Cc: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "Steven J. Hill" <steven.hill@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15131/
[james.hogan@imgtec.com: Preserve sort order where it already exists]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
2017-02-14 09:00:25 +00:00

563 lines
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/*
* 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.
*
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
* Copyright (C) 2008 Nicolas Schichan <nschichan@freebox.fr>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/spinlock.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
#include <bcm63xx_irq.h>
static DEFINE_SPINLOCK(ipic_lock);
static DEFINE_SPINLOCK(epic_lock);
static u32 irq_stat_addr[2];
static u32 irq_mask_addr[2];
static void (*dispatch_internal)(int cpu);
static int is_ext_irq_cascaded;
static unsigned int ext_irq_count;
static unsigned int ext_irq_start, ext_irq_end;
static unsigned int ext_irq_cfg_reg1, ext_irq_cfg_reg2;
static void (*internal_irq_mask)(struct irq_data *d);
static void (*internal_irq_unmask)(struct irq_data *d, const struct cpumask *m);
static inline u32 get_ext_irq_perf_reg(int irq)
{
if (irq < 4)
return ext_irq_cfg_reg1;
return ext_irq_cfg_reg2;
}
static inline void handle_internal(int intbit)
{
if (is_ext_irq_cascaded &&
intbit >= ext_irq_start && intbit <= ext_irq_end)
do_IRQ(intbit - ext_irq_start + IRQ_EXTERNAL_BASE);
else
do_IRQ(intbit + IRQ_INTERNAL_BASE);
}
static inline int enable_irq_for_cpu(int cpu, struct irq_data *d,
const struct cpumask *m)
{
bool enable = cpu_online(cpu);
#ifdef CONFIG_SMP
if (m)
enable &= cpumask_test_cpu(cpu, m);
else if (irqd_affinity_was_set(d))
enable &= cpumask_test_cpu(cpu, irq_data_get_affinity_mask(d));
#endif
return enable;
}
/*
* dispatch internal devices IRQ (uart, enet, watchdog, ...). do not
* prioritize any interrupt relatively to another. the static counter
* will resume the loop where it ended the last time we left this
* function.
*/
#define BUILD_IPIC_INTERNAL(width) \
void __dispatch_internal_##width(int cpu) \
{ \
u32 pending[width / 32]; \
unsigned int src, tgt; \
bool irqs_pending = false; \
static unsigned int i[2]; \
unsigned int *next = &i[cpu]; \
unsigned long flags; \
\
/* read registers in reverse order */ \
spin_lock_irqsave(&ipic_lock, flags); \
for (src = 0, tgt = (width / 32); src < (width / 32); src++) { \
u32 val; \
\
val = bcm_readl(irq_stat_addr[cpu] + src * sizeof(u32)); \
val &= bcm_readl(irq_mask_addr[cpu] + src * sizeof(u32)); \
pending[--tgt] = val; \
\
if (val) \
irqs_pending = true; \
} \
spin_unlock_irqrestore(&ipic_lock, flags); \
\
if (!irqs_pending) \
return; \
\
while (1) { \
unsigned int to_call = *next; \
\
*next = (*next + 1) & (width - 1); \
if (pending[to_call / 32] & (1 << (to_call & 0x1f))) { \
handle_internal(to_call); \
break; \
} \
} \
} \
\
static void __internal_irq_mask_##width(struct irq_data *d) \
{ \
u32 val; \
unsigned irq = d->irq - IRQ_INTERNAL_BASE; \
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
unsigned long flags; \
int cpu; \
\
spin_lock_irqsave(&ipic_lock, flags); \
for_each_present_cpu(cpu) { \
if (!irq_mask_addr[cpu]) \
break; \
\
val = bcm_readl(irq_mask_addr[cpu] + reg * sizeof(u32));\
val &= ~(1 << bit); \
bcm_writel(val, irq_mask_addr[cpu] + reg * sizeof(u32));\
} \
spin_unlock_irqrestore(&ipic_lock, flags); \
} \
\
static void __internal_irq_unmask_##width(struct irq_data *d, \
const struct cpumask *m) \
{ \
u32 val; \
unsigned irq = d->irq - IRQ_INTERNAL_BASE; \
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
unsigned long flags; \
int cpu; \
\
spin_lock_irqsave(&ipic_lock, flags); \
for_each_present_cpu(cpu) { \
if (!irq_mask_addr[cpu]) \
break; \
\
val = bcm_readl(irq_mask_addr[cpu] + reg * sizeof(u32));\
if (enable_irq_for_cpu(cpu, d, m)) \
val |= (1 << bit); \
else \
val &= ~(1 << bit); \
bcm_writel(val, irq_mask_addr[cpu] + reg * sizeof(u32));\
} \
spin_unlock_irqrestore(&ipic_lock, flags); \
}
BUILD_IPIC_INTERNAL(32);
BUILD_IPIC_INTERNAL(64);
asmlinkage void plat_irq_dispatch(void)
{
u32 cause;
do {
cause = read_c0_cause() & read_c0_status() & ST0_IM;
if (!cause)
break;
if (cause & CAUSEF_IP7)
do_IRQ(7);
if (cause & CAUSEF_IP0)
do_IRQ(0);
if (cause & CAUSEF_IP1)
do_IRQ(1);
if (cause & CAUSEF_IP2)
dispatch_internal(0);
if (is_ext_irq_cascaded) {
if (cause & CAUSEF_IP3)
dispatch_internal(1);
} else {
if (cause & CAUSEF_IP3)
do_IRQ(IRQ_EXT_0);
if (cause & CAUSEF_IP4)
do_IRQ(IRQ_EXT_1);
if (cause & CAUSEF_IP5)
do_IRQ(IRQ_EXT_2);
if (cause & CAUSEF_IP6)
do_IRQ(IRQ_EXT_3);
}
} while (1);
}
/*
* internal IRQs operations: only mask/unmask on PERF irq mask
* register.
*/
static void bcm63xx_internal_irq_mask(struct irq_data *d)
{
internal_irq_mask(d);
}
static void bcm63xx_internal_irq_unmask(struct irq_data *d)
{
internal_irq_unmask(d, NULL);
}
/*
* external IRQs operations: mask/unmask and clear on PERF external
* irq control register.
*/
static void bcm63xx_external_irq_mask(struct irq_data *d)
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
reg &= ~EXTIRQ_CFG_MASK_6348(irq % 4);
else
reg &= ~EXTIRQ_CFG_MASK(irq % 4);
bcm_perf_writel(reg, regaddr);
spin_unlock_irqrestore(&epic_lock, flags);
if (is_ext_irq_cascaded)
internal_irq_mask(irq_get_irq_data(irq + ext_irq_start));
}
static void bcm63xx_external_irq_unmask(struct irq_data *d)
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
reg |= EXTIRQ_CFG_MASK_6348(irq % 4);
else
reg |= EXTIRQ_CFG_MASK(irq % 4);
bcm_perf_writel(reg, regaddr);
spin_unlock_irqrestore(&epic_lock, flags);
if (is_ext_irq_cascaded)
internal_irq_unmask(irq_get_irq_data(irq + ext_irq_start),
NULL);
}
static void bcm63xx_external_irq_clear(struct irq_data *d)
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
reg |= EXTIRQ_CFG_CLEAR_6348(irq % 4);
else
reg |= EXTIRQ_CFG_CLEAR(irq % 4);
bcm_perf_writel(reg, regaddr);
spin_unlock_irqrestore(&epic_lock, flags);
}
static int bcm63xx_external_irq_set_type(struct irq_data *d,
unsigned int flow_type)
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
int levelsense, sense, bothedge;
unsigned long flags;
flow_type &= IRQ_TYPE_SENSE_MASK;
if (flow_type == IRQ_TYPE_NONE)
flow_type = IRQ_TYPE_LEVEL_LOW;
levelsense = sense = bothedge = 0;
switch (flow_type) {
case IRQ_TYPE_EDGE_BOTH:
bothedge = 1;
break;
case IRQ_TYPE_EDGE_RISING:
sense = 1;
break;
case IRQ_TYPE_EDGE_FALLING:
break;
case IRQ_TYPE_LEVEL_HIGH:
levelsense = 1;
sense = 1;
break;
case IRQ_TYPE_LEVEL_LOW:
levelsense = 1;
break;
default:
pr_err("bogus flow type combination given !\n");
return -EINVAL;
}
regaddr = get_ext_irq_perf_reg(irq);
spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
irq %= 4;
switch (bcm63xx_get_cpu_id()) {
case BCM6348_CPU_ID:
if (levelsense)
reg |= EXTIRQ_CFG_LEVELSENSE_6348(irq);
else
reg &= ~EXTIRQ_CFG_LEVELSENSE_6348(irq);
if (sense)
reg |= EXTIRQ_CFG_SENSE_6348(irq);
else
reg &= ~EXTIRQ_CFG_SENSE_6348(irq);
if (bothedge)
reg |= EXTIRQ_CFG_BOTHEDGE_6348(irq);
else
reg &= ~EXTIRQ_CFG_BOTHEDGE_6348(irq);
break;
case BCM3368_CPU_ID:
case BCM6328_CPU_ID:
case BCM6338_CPU_ID:
case BCM6345_CPU_ID:
case BCM6358_CPU_ID:
case BCM6362_CPU_ID:
case BCM6368_CPU_ID:
if (levelsense)
reg |= EXTIRQ_CFG_LEVELSENSE(irq);
else
reg &= ~EXTIRQ_CFG_LEVELSENSE(irq);
if (sense)
reg |= EXTIRQ_CFG_SENSE(irq);
else
reg &= ~EXTIRQ_CFG_SENSE(irq);
if (bothedge)
reg |= EXTIRQ_CFG_BOTHEDGE(irq);
else
reg &= ~EXTIRQ_CFG_BOTHEDGE(irq);
break;
default:
BUG();
}
bcm_perf_writel(reg, regaddr);
spin_unlock_irqrestore(&epic_lock, flags);
irqd_set_trigger_type(d, flow_type);
if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
irq_set_handler_locked(d, handle_level_irq);
else
irq_set_handler_locked(d, handle_edge_irq);
return IRQ_SET_MASK_OK_NOCOPY;
}
#ifdef CONFIG_SMP
static int bcm63xx_internal_set_affinity(struct irq_data *data,
const struct cpumask *dest,
bool force)
{
if (!irqd_irq_disabled(data))
internal_irq_unmask(data, dest);
return 0;
}
#endif
static struct irq_chip bcm63xx_internal_irq_chip = {
.name = "bcm63xx_ipic",
.irq_mask = bcm63xx_internal_irq_mask,
.irq_unmask = bcm63xx_internal_irq_unmask,
};
static struct irq_chip bcm63xx_external_irq_chip = {
.name = "bcm63xx_epic",
.irq_ack = bcm63xx_external_irq_clear,
.irq_mask = bcm63xx_external_irq_mask,
.irq_unmask = bcm63xx_external_irq_unmask,
.irq_set_type = bcm63xx_external_irq_set_type,
};
static struct irqaction cpu_ip2_cascade_action = {
.handler = no_action,
.name = "cascade_ip2",
.flags = IRQF_NO_THREAD,
};
#ifdef CONFIG_SMP
static struct irqaction cpu_ip3_cascade_action = {
.handler = no_action,
.name = "cascade_ip3",
.flags = IRQF_NO_THREAD,
};
#endif
static struct irqaction cpu_ext_cascade_action = {
.handler = no_action,
.name = "cascade_extirq",
.flags = IRQF_NO_THREAD,
};
static void bcm63xx_init_irq(void)
{
int irq_bits;
irq_stat_addr[0] = bcm63xx_regset_address(RSET_PERF);
irq_mask_addr[0] = bcm63xx_regset_address(RSET_PERF);
irq_stat_addr[1] = bcm63xx_regset_address(RSET_PERF);
irq_mask_addr[1] = bcm63xx_regset_address(RSET_PERF);
switch (bcm63xx_get_cpu_id()) {
case BCM3368_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_3368_REG;
irq_mask_addr[0] += PERF_IRQMASK_3368_REG;
irq_stat_addr[1] = 0;
irq_mask_addr[1] = 0;
irq_bits = 32;
ext_irq_count = 4;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_3368;
break;
case BCM6328_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6328_REG(0);
irq_mask_addr[0] += PERF_IRQMASK_6328_REG(0);
irq_stat_addr[1] += PERF_IRQSTAT_6328_REG(1);
irq_mask_addr[1] += PERF_IRQMASK_6328_REG(1);
irq_bits = 64;
ext_irq_count = 4;
is_ext_irq_cascaded = 1;
ext_irq_start = BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE;
ext_irq_end = BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6328;
break;
case BCM6338_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6338_REG;
irq_mask_addr[0] += PERF_IRQMASK_6338_REG;
irq_stat_addr[1] = 0;
irq_mask_addr[1] = 0;
irq_bits = 32;
ext_irq_count = 4;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6338;
break;
case BCM6345_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6345_REG;
irq_mask_addr[0] += PERF_IRQMASK_6345_REG;
irq_stat_addr[1] = 0;
irq_mask_addr[1] = 0;
irq_bits = 32;
ext_irq_count = 4;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6345;
break;
case BCM6348_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6348_REG;
irq_mask_addr[0] += PERF_IRQMASK_6348_REG;
irq_stat_addr[1] = 0;
irq_mask_addr[1] = 0;
irq_bits = 32;
ext_irq_count = 4;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6348;
break;
case BCM6358_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6358_REG(0);
irq_mask_addr[0] += PERF_IRQMASK_6358_REG(0);
irq_stat_addr[1] += PERF_IRQSTAT_6358_REG(1);
irq_mask_addr[1] += PERF_IRQMASK_6358_REG(1);
irq_bits = 32;
ext_irq_count = 4;
is_ext_irq_cascaded = 1;
ext_irq_start = BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE;
ext_irq_end = BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6358;
break;
case BCM6362_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6362_REG(0);
irq_mask_addr[0] += PERF_IRQMASK_6362_REG(0);
irq_stat_addr[1] += PERF_IRQSTAT_6362_REG(1);
irq_mask_addr[1] += PERF_IRQMASK_6362_REG(1);
irq_bits = 64;
ext_irq_count = 4;
is_ext_irq_cascaded = 1;
ext_irq_start = BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE;
ext_irq_end = BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6362;
break;
case BCM6368_CPU_ID:
irq_stat_addr[0] += PERF_IRQSTAT_6368_REG(0);
irq_mask_addr[0] += PERF_IRQMASK_6368_REG(0);
irq_stat_addr[1] += PERF_IRQSTAT_6368_REG(1);
irq_mask_addr[1] += PERF_IRQMASK_6368_REG(1);
irq_bits = 64;
ext_irq_count = 6;
is_ext_irq_cascaded = 1;
ext_irq_start = BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE;
ext_irq_end = BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE;
ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6368;
ext_irq_cfg_reg2 = PERF_EXTIRQ_CFG_REG2_6368;
break;
default:
BUG();
}
if (irq_bits == 32) {
dispatch_internal = __dispatch_internal_32;
internal_irq_mask = __internal_irq_mask_32;
internal_irq_unmask = __internal_irq_unmask_32;
} else {
dispatch_internal = __dispatch_internal_64;
internal_irq_mask = __internal_irq_mask_64;
internal_irq_unmask = __internal_irq_unmask_64;
}
}
void __init arch_init_irq(void)
{
int i;
bcm63xx_init_irq();
mips_cpu_irq_init();
for (i = IRQ_INTERNAL_BASE; i < NR_IRQS; ++i)
irq_set_chip_and_handler(i, &bcm63xx_internal_irq_chip,
handle_level_irq);
for (i = IRQ_EXTERNAL_BASE; i < IRQ_EXTERNAL_BASE + ext_irq_count; ++i)
irq_set_chip_and_handler(i, &bcm63xx_external_irq_chip,
handle_edge_irq);
if (!is_ext_irq_cascaded) {
for (i = 3; i < 3 + ext_irq_count; ++i)
setup_irq(MIPS_CPU_IRQ_BASE + i, &cpu_ext_cascade_action);
}
setup_irq(MIPS_CPU_IRQ_BASE + 2, &cpu_ip2_cascade_action);
#ifdef CONFIG_SMP
if (is_ext_irq_cascaded) {
setup_irq(MIPS_CPU_IRQ_BASE + 3, &cpu_ip3_cascade_action);
bcm63xx_internal_irq_chip.irq_set_affinity =
bcm63xx_internal_set_affinity;
cpumask_clear(irq_default_affinity);
cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
}
#endif
}
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