linux/drivers/irqchip/irq-stm32-exti.c
Antonio Borneo 8fc7a6198a irqchip/stm32-exti: Remove check on always false condition
The field drv_data is assigned during driver's probe, where it's
already checked to be not NULL.

Remove the always false check '!host_data->drv_data'.

This fixes a warning "variable dereferenced before check" detected
by '0-DAY CI Kernel Test Service'.

Fixes: c297493336 ("irqchip/stm32-exti: Simplify irq description table")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/lkml/202208131739.gJvcs9ls-lkp@intel.com/
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220817125758.5975-1-antonio.borneo@foss.st.com
2022-09-12 16:31:25 +01:00

1015 lines
24 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) Maxime Coquelin 2015
* Copyright (C) STMicroelectronics 2017
* Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/hwspinlock.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/syscore_ops.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define IRQS_PER_BANK 32
#define HWSPNLCK_TIMEOUT 1000 /* usec */
struct stm32_exti_bank {
u32 imr_ofst;
u32 emr_ofst;
u32 rtsr_ofst;
u32 ftsr_ofst;
u32 swier_ofst;
u32 rpr_ofst;
u32 fpr_ofst;
u32 trg_ofst;
};
#define UNDEF_REG ~0
struct stm32_exti_drv_data {
const struct stm32_exti_bank **exti_banks;
const u8 *desc_irqs;
u32 bank_nr;
};
struct stm32_exti_chip_data {
struct stm32_exti_host_data *host_data;
const struct stm32_exti_bank *reg_bank;
struct raw_spinlock rlock;
u32 wake_active;
u32 mask_cache;
u32 rtsr_cache;
u32 ftsr_cache;
};
struct stm32_exti_host_data {
void __iomem *base;
struct stm32_exti_chip_data *chips_data;
const struct stm32_exti_drv_data *drv_data;
struct hwspinlock *hwlock;
};
static struct stm32_exti_host_data *stm32_host_data;
static const struct stm32_exti_bank stm32f4xx_exti_b1 = {
.imr_ofst = 0x00,
.emr_ofst = 0x04,
.rtsr_ofst = 0x08,
.ftsr_ofst = 0x0C,
.swier_ofst = 0x10,
.rpr_ofst = 0x14,
.fpr_ofst = UNDEF_REG,
.trg_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank *stm32f4xx_exti_banks[] = {
&stm32f4xx_exti_b1,
};
static const struct stm32_exti_drv_data stm32f4xx_drv_data = {
.exti_banks = stm32f4xx_exti_banks,
.bank_nr = ARRAY_SIZE(stm32f4xx_exti_banks),
};
static const struct stm32_exti_bank stm32h7xx_exti_b1 = {
.imr_ofst = 0x80,
.emr_ofst = 0x84,
.rtsr_ofst = 0x00,
.ftsr_ofst = 0x04,
.swier_ofst = 0x08,
.rpr_ofst = 0x88,
.fpr_ofst = UNDEF_REG,
.trg_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
.imr_ofst = 0x90,
.emr_ofst = 0x94,
.rtsr_ofst = 0x20,
.ftsr_ofst = 0x24,
.swier_ofst = 0x28,
.rpr_ofst = 0x98,
.fpr_ofst = UNDEF_REG,
.trg_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
.imr_ofst = 0xA0,
.emr_ofst = 0xA4,
.rtsr_ofst = 0x40,
.ftsr_ofst = 0x44,
.swier_ofst = 0x48,
.rpr_ofst = 0xA8,
.fpr_ofst = UNDEF_REG,
.trg_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank *stm32h7xx_exti_banks[] = {
&stm32h7xx_exti_b1,
&stm32h7xx_exti_b2,
&stm32h7xx_exti_b3,
};
static const struct stm32_exti_drv_data stm32h7xx_drv_data = {
.exti_banks = stm32h7xx_exti_banks,
.bank_nr = ARRAY_SIZE(stm32h7xx_exti_banks),
};
static const struct stm32_exti_bank stm32mp1_exti_b1 = {
.imr_ofst = 0x80,
.emr_ofst = UNDEF_REG,
.rtsr_ofst = 0x00,
.ftsr_ofst = 0x04,
.swier_ofst = 0x08,
.rpr_ofst = 0x0C,
.fpr_ofst = 0x10,
.trg_ofst = 0x3EC,
};
static const struct stm32_exti_bank stm32mp1_exti_b2 = {
.imr_ofst = 0x90,
.emr_ofst = UNDEF_REG,
.rtsr_ofst = 0x20,
.ftsr_ofst = 0x24,
.swier_ofst = 0x28,
.rpr_ofst = 0x2C,
.fpr_ofst = 0x30,
.trg_ofst = 0x3E8,
};
static const struct stm32_exti_bank stm32mp1_exti_b3 = {
.imr_ofst = 0xA0,
.emr_ofst = UNDEF_REG,
.rtsr_ofst = 0x40,
.ftsr_ofst = 0x44,
.swier_ofst = 0x48,
.rpr_ofst = 0x4C,
.fpr_ofst = 0x50,
.trg_ofst = 0x3E4,
};
static const struct stm32_exti_bank *stm32mp1_exti_banks[] = {
&stm32mp1_exti_b1,
&stm32mp1_exti_b2,
&stm32mp1_exti_b3,
};
static struct irq_chip stm32_exti_h_chip;
static struct irq_chip stm32_exti_h_chip_direct;
#define EXTI_INVALID_IRQ U8_MAX
#define STM32MP1_DESC_IRQ_SIZE (ARRAY_SIZE(stm32mp1_exti_banks) * IRQS_PER_BANK)
static const u8 stm32mp1_desc_irq[] = {
/* default value */
[0 ... (STM32MP1_DESC_IRQ_SIZE - 1)] = EXTI_INVALID_IRQ,
[0] = 6,
[1] = 7,
[2] = 8,
[3] = 9,
[4] = 10,
[5] = 23,
[6] = 64,
[7] = 65,
[8] = 66,
[9] = 67,
[10] = 40,
[11] = 42,
[12] = 76,
[13] = 77,
[14] = 121,
[15] = 127,
[16] = 1,
[19] = 3,
[21] = 31,
[22] = 33,
[23] = 72,
[24] = 95,
[25] = 107,
[26] = 37,
[27] = 38,
[28] = 39,
[29] = 71,
[30] = 52,
[31] = 53,
[32] = 82,
[33] = 83,
[47] = 93,
[48] = 138,
[50] = 139,
[52] = 140,
[53] = 141,
[54] = 135,
[61] = 100,
[65] = 144,
[68] = 143,
[70] = 62,
[73] = 129,
};
static const u8 stm32mp13_desc_irq[] = {
/* default value */
[0 ... (STM32MP1_DESC_IRQ_SIZE - 1)] = EXTI_INVALID_IRQ,
[0] = 6,
[1] = 7,
[2] = 8,
[3] = 9,
[4] = 10,
[5] = 24,
[6] = 65,
[7] = 66,
[8] = 67,
[9] = 68,
[10] = 41,
[11] = 43,
[12] = 77,
[13] = 78,
[14] = 106,
[15] = 109,
[16] = 1,
[19] = 3,
[21] = 32,
[22] = 34,
[23] = 73,
[24] = 93,
[25] = 114,
[26] = 38,
[27] = 39,
[28] = 40,
[29] = 72,
[30] = 53,
[31] = 54,
[32] = 83,
[33] = 84,
[44] = 96,
[47] = 92,
[48] = 116,
[50] = 117,
[52] = 118,
[53] = 119,
[68] = 63,
[70] = 98,
};
static const struct stm32_exti_drv_data stm32mp1_drv_data = {
.exti_banks = stm32mp1_exti_banks,
.bank_nr = ARRAY_SIZE(stm32mp1_exti_banks),
.desc_irqs = stm32mp1_desc_irq,
};
static const struct stm32_exti_drv_data stm32mp13_drv_data = {
.exti_banks = stm32mp1_exti_banks,
.bank_nr = ARRAY_SIZE(stm32mp1_exti_banks),
.desc_irqs = stm32mp13_desc_irq,
};
static unsigned long stm32_exti_pending(struct irq_chip_generic *gc)
{
struct stm32_exti_chip_data *chip_data = gc->private;
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
unsigned long pending;
pending = irq_reg_readl(gc, stm32_bank->rpr_ofst);
if (stm32_bank->fpr_ofst != UNDEF_REG)
pending |= irq_reg_readl(gc, stm32_bank->fpr_ofst);
return pending;
}
static void stm32_irq_handler(struct irq_desc *desc)
{
struct irq_domain *domain = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int nbanks = domain->gc->num_chips;
struct irq_chip_generic *gc;
unsigned long pending;
int n, i, irq_base = 0;
chained_irq_enter(chip, desc);
for (i = 0; i < nbanks; i++, irq_base += IRQS_PER_BANK) {
gc = irq_get_domain_generic_chip(domain, irq_base);
while ((pending = stm32_exti_pending(gc))) {
for_each_set_bit(n, &pending, IRQS_PER_BANK)
generic_handle_domain_irq(domain, irq_base + n);
}
}
chained_irq_exit(chip, desc);
}
static int stm32_exti_set_type(struct irq_data *d,
unsigned int type, u32 *rtsr, u32 *ftsr)
{
u32 mask = BIT(d->hwirq % IRQS_PER_BANK);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
*rtsr |= mask;
*ftsr &= ~mask;
break;
case IRQ_TYPE_EDGE_FALLING:
*rtsr &= ~mask;
*ftsr |= mask;
break;
case IRQ_TYPE_EDGE_BOTH:
*rtsr |= mask;
*ftsr |= mask;
break;
default:
return -EINVAL;
}
return 0;
}
static int stm32_irq_set_type(struct irq_data *d, unsigned int type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct stm32_exti_chip_data *chip_data = gc->private;
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
struct hwspinlock *hwlock = chip_data->host_data->hwlock;
u32 rtsr, ftsr;
int err;
irq_gc_lock(gc);
if (hwlock) {
err = hwspin_lock_timeout_in_atomic(hwlock, HWSPNLCK_TIMEOUT);
if (err) {
pr_err("%s can't get hwspinlock (%d)\n", __func__, err);
goto unlock;
}
}
rtsr = irq_reg_readl(gc, stm32_bank->rtsr_ofst);
ftsr = irq_reg_readl(gc, stm32_bank->ftsr_ofst);
err = stm32_exti_set_type(d, type, &rtsr, &ftsr);
if (err)
goto unspinlock;
irq_reg_writel(gc, rtsr, stm32_bank->rtsr_ofst);
irq_reg_writel(gc, ftsr, stm32_bank->ftsr_ofst);
unspinlock:
if (hwlock)
hwspin_unlock_in_atomic(hwlock);
unlock:
irq_gc_unlock(gc);
return err;
}
static void stm32_chip_suspend(struct stm32_exti_chip_data *chip_data,
u32 wake_active)
{
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
void __iomem *base = chip_data->host_data->base;
/* save rtsr, ftsr registers */
chip_data->rtsr_cache = readl_relaxed(base + stm32_bank->rtsr_ofst);
chip_data->ftsr_cache = readl_relaxed(base + stm32_bank->ftsr_ofst);
writel_relaxed(wake_active, base + stm32_bank->imr_ofst);
}
static void stm32_chip_resume(struct stm32_exti_chip_data *chip_data,
u32 mask_cache)
{
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
void __iomem *base = chip_data->host_data->base;
/* restore rtsr, ftsr, registers */
writel_relaxed(chip_data->rtsr_cache, base + stm32_bank->rtsr_ofst);
writel_relaxed(chip_data->ftsr_cache, base + stm32_bank->ftsr_ofst);
writel_relaxed(mask_cache, base + stm32_bank->imr_ofst);
}
static void stm32_irq_suspend(struct irq_chip_generic *gc)
{
struct stm32_exti_chip_data *chip_data = gc->private;
irq_gc_lock(gc);
stm32_chip_suspend(chip_data, gc->wake_active);
irq_gc_unlock(gc);
}
static void stm32_irq_resume(struct irq_chip_generic *gc)
{
struct stm32_exti_chip_data *chip_data = gc->private;
irq_gc_lock(gc);
stm32_chip_resume(chip_data, gc->mask_cache);
irq_gc_unlock(gc);
}
static int stm32_exti_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *data)
{
struct irq_fwspec *fwspec = data;
irq_hw_number_t hwirq;
hwirq = fwspec->param[0];
irq_map_generic_chip(d, virq, hwirq);
return 0;
}
static void stm32_exti_free(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs)
{
struct irq_data *data = irq_domain_get_irq_data(d, virq);
irq_domain_reset_irq_data(data);
}
static const struct irq_domain_ops irq_exti_domain_ops = {
.map = irq_map_generic_chip,
.alloc = stm32_exti_alloc,
.free = stm32_exti_free,
};
static void stm32_irq_ack(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct stm32_exti_chip_data *chip_data = gc->private;
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
irq_gc_lock(gc);
irq_reg_writel(gc, d->mask, stm32_bank->rpr_ofst);
if (stm32_bank->fpr_ofst != UNDEF_REG)
irq_reg_writel(gc, d->mask, stm32_bank->fpr_ofst);
irq_gc_unlock(gc);
}
/* directly set the target bit without reading first. */
static inline void stm32_exti_write_bit(struct irq_data *d, u32 reg)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
void __iomem *base = chip_data->host_data->base;
u32 val = BIT(d->hwirq % IRQS_PER_BANK);
writel_relaxed(val, base + reg);
}
static inline u32 stm32_exti_set_bit(struct irq_data *d, u32 reg)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
void __iomem *base = chip_data->host_data->base;
u32 val;
val = readl_relaxed(base + reg);
val |= BIT(d->hwirq % IRQS_PER_BANK);
writel_relaxed(val, base + reg);
return val;
}
static inline u32 stm32_exti_clr_bit(struct irq_data *d, u32 reg)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
void __iomem *base = chip_data->host_data->base;
u32 val;
val = readl_relaxed(base + reg);
val &= ~BIT(d->hwirq % IRQS_PER_BANK);
writel_relaxed(val, base + reg);
return val;
}
static void stm32_exti_h_eoi(struct irq_data *d)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
raw_spin_lock(&chip_data->rlock);
stm32_exti_write_bit(d, stm32_bank->rpr_ofst);
if (stm32_bank->fpr_ofst != UNDEF_REG)
stm32_exti_write_bit(d, stm32_bank->fpr_ofst);
raw_spin_unlock(&chip_data->rlock);
if (d->parent_data->chip)
irq_chip_eoi_parent(d);
}
static void stm32_exti_h_mask(struct irq_data *d)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
raw_spin_lock(&chip_data->rlock);
chip_data->mask_cache = stm32_exti_clr_bit(d, stm32_bank->imr_ofst);
raw_spin_unlock(&chip_data->rlock);
if (d->parent_data->chip)
irq_chip_mask_parent(d);
}
static void stm32_exti_h_unmask(struct irq_data *d)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
raw_spin_lock(&chip_data->rlock);
chip_data->mask_cache = stm32_exti_set_bit(d, stm32_bank->imr_ofst);
raw_spin_unlock(&chip_data->rlock);
if (d->parent_data->chip)
irq_chip_unmask_parent(d);
}
static int stm32_exti_h_set_type(struct irq_data *d, unsigned int type)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
struct hwspinlock *hwlock = chip_data->host_data->hwlock;
void __iomem *base = chip_data->host_data->base;
u32 rtsr, ftsr;
int err;
raw_spin_lock(&chip_data->rlock);
if (hwlock) {
err = hwspin_lock_timeout_in_atomic(hwlock, HWSPNLCK_TIMEOUT);
if (err) {
pr_err("%s can't get hwspinlock (%d)\n", __func__, err);
goto unlock;
}
}
rtsr = readl_relaxed(base + stm32_bank->rtsr_ofst);
ftsr = readl_relaxed(base + stm32_bank->ftsr_ofst);
err = stm32_exti_set_type(d, type, &rtsr, &ftsr);
if (err)
goto unspinlock;
writel_relaxed(rtsr, base + stm32_bank->rtsr_ofst);
writel_relaxed(ftsr, base + stm32_bank->ftsr_ofst);
unspinlock:
if (hwlock)
hwspin_unlock_in_atomic(hwlock);
unlock:
raw_spin_unlock(&chip_data->rlock);
return err;
}
static int stm32_exti_h_set_wake(struct irq_data *d, unsigned int on)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
u32 mask = BIT(d->hwirq % IRQS_PER_BANK);
raw_spin_lock(&chip_data->rlock);
if (on)
chip_data->wake_active |= mask;
else
chip_data->wake_active &= ~mask;
raw_spin_unlock(&chip_data->rlock);
return 0;
}
static int stm32_exti_h_set_affinity(struct irq_data *d,
const struct cpumask *dest, bool force)
{
if (d->parent_data->chip)
return irq_chip_set_affinity_parent(d, dest, force);
return IRQ_SET_MASK_OK_DONE;
}
static int __maybe_unused stm32_exti_h_suspend(void)
{
struct stm32_exti_chip_data *chip_data;
int i;
for (i = 0; i < stm32_host_data->drv_data->bank_nr; i++) {
chip_data = &stm32_host_data->chips_data[i];
raw_spin_lock(&chip_data->rlock);
stm32_chip_suspend(chip_data, chip_data->wake_active);
raw_spin_unlock(&chip_data->rlock);
}
return 0;
}
static void __maybe_unused stm32_exti_h_resume(void)
{
struct stm32_exti_chip_data *chip_data;
int i;
for (i = 0; i < stm32_host_data->drv_data->bank_nr; i++) {
chip_data = &stm32_host_data->chips_data[i];
raw_spin_lock(&chip_data->rlock);
stm32_chip_resume(chip_data, chip_data->mask_cache);
raw_spin_unlock(&chip_data->rlock);
}
}
static struct syscore_ops stm32_exti_h_syscore_ops = {
#ifdef CONFIG_PM_SLEEP
.suspend = stm32_exti_h_suspend,
.resume = stm32_exti_h_resume,
#endif
};
static void stm32_exti_h_syscore_init(struct stm32_exti_host_data *host_data)
{
stm32_host_data = host_data;
register_syscore_ops(&stm32_exti_h_syscore_ops);
}
static void stm32_exti_h_syscore_deinit(void)
{
unregister_syscore_ops(&stm32_exti_h_syscore_ops);
}
static int stm32_exti_h_retrigger(struct irq_data *d)
{
struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
void __iomem *base = chip_data->host_data->base;
u32 mask = BIT(d->hwirq % IRQS_PER_BANK);
writel_relaxed(mask, base + stm32_bank->swier_ofst);
return 0;
}
static struct irq_chip stm32_exti_h_chip = {
.name = "stm32-exti-h",
.irq_eoi = stm32_exti_h_eoi,
.irq_mask = stm32_exti_h_mask,
.irq_unmask = stm32_exti_h_unmask,
.irq_retrigger = stm32_exti_h_retrigger,
.irq_set_type = stm32_exti_h_set_type,
.irq_set_wake = stm32_exti_h_set_wake,
.flags = IRQCHIP_MASK_ON_SUSPEND,
.irq_set_affinity = IS_ENABLED(CONFIG_SMP) ? stm32_exti_h_set_affinity : NULL,
};
static struct irq_chip stm32_exti_h_chip_direct = {
.name = "stm32-exti-h-direct",
.irq_eoi = irq_chip_eoi_parent,
.irq_ack = irq_chip_ack_parent,
.irq_mask = stm32_exti_h_mask,
.irq_unmask = stm32_exti_h_unmask,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_set_type = irq_chip_set_type_parent,
.irq_set_wake = stm32_exti_h_set_wake,
.flags = IRQCHIP_MASK_ON_SUSPEND,
.irq_set_affinity = IS_ENABLED(CONFIG_SMP) ? irq_chip_set_affinity_parent : NULL,
};
static int stm32_exti_h_domain_alloc(struct irq_domain *dm,
unsigned int virq,
unsigned int nr_irqs, void *data)
{
struct stm32_exti_host_data *host_data = dm->host_data;
struct stm32_exti_chip_data *chip_data;
u8 desc_irq;
struct irq_fwspec *fwspec = data;
struct irq_fwspec p_fwspec;
irq_hw_number_t hwirq;
int bank;
u32 event_trg;
struct irq_chip *chip;
hwirq = fwspec->param[0];
if (hwirq >= host_data->drv_data->bank_nr * IRQS_PER_BANK)
return -EINVAL;
bank = hwirq / IRQS_PER_BANK;
chip_data = &host_data->chips_data[bank];
event_trg = readl_relaxed(host_data->base + chip_data->reg_bank->trg_ofst);
chip = (event_trg & BIT(hwirq % IRQS_PER_BANK)) ?
&stm32_exti_h_chip : &stm32_exti_h_chip_direct;
irq_domain_set_hwirq_and_chip(dm, virq, hwirq, chip, chip_data);
if (!host_data->drv_data->desc_irqs)
return -EINVAL;
desc_irq = host_data->drv_data->desc_irqs[hwirq];
if (desc_irq != EXTI_INVALID_IRQ) {
p_fwspec.fwnode = dm->parent->fwnode;
p_fwspec.param_count = 3;
p_fwspec.param[0] = GIC_SPI;
p_fwspec.param[1] = desc_irq;
p_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
return irq_domain_alloc_irqs_parent(dm, virq, 1, &p_fwspec);
}
return 0;
}
static struct
stm32_exti_host_data *stm32_exti_host_init(const struct stm32_exti_drv_data *dd,
struct device_node *node)
{
struct stm32_exti_host_data *host_data;
host_data = kzalloc(sizeof(*host_data), GFP_KERNEL);
if (!host_data)
return NULL;
host_data->drv_data = dd;
host_data->chips_data = kcalloc(dd->bank_nr,
sizeof(struct stm32_exti_chip_data),
GFP_KERNEL);
if (!host_data->chips_data)
goto free_host_data;
host_data->base = of_iomap(node, 0);
if (!host_data->base) {
pr_err("%pOF: Unable to map registers\n", node);
goto free_chips_data;
}
stm32_host_data = host_data;
return host_data;
free_chips_data:
kfree(host_data->chips_data);
free_host_data:
kfree(host_data);
return NULL;
}
static struct
stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
u32 bank_idx,
struct device_node *node)
{
const struct stm32_exti_bank *stm32_bank;
struct stm32_exti_chip_data *chip_data;
void __iomem *base = h_data->base;
stm32_bank = h_data->drv_data->exti_banks[bank_idx];
chip_data = &h_data->chips_data[bank_idx];
chip_data->host_data = h_data;
chip_data->reg_bank = stm32_bank;
raw_spin_lock_init(&chip_data->rlock);
/*
* This IP has no reset, so after hot reboot we should
* clear registers to avoid residue
*/
writel_relaxed(0, base + stm32_bank->imr_ofst);
if (stm32_bank->emr_ofst != UNDEF_REG)
writel_relaxed(0, base + stm32_bank->emr_ofst);
pr_info("%pOF: bank%d\n", node, bank_idx);
return chip_data;
}
static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
struct device_node *node)
{
struct stm32_exti_host_data *host_data;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
int nr_irqs, ret, i;
struct irq_chip_generic *gc;
struct irq_domain *domain;
host_data = stm32_exti_host_init(drv_data, node);
if (!host_data)
return -ENOMEM;
domain = irq_domain_add_linear(node, drv_data->bank_nr * IRQS_PER_BANK,
&irq_exti_domain_ops, NULL);
if (!domain) {
pr_err("%pOFn: Could not register interrupt domain.\n",
node);
ret = -ENOMEM;
goto out_unmap;
}
ret = irq_alloc_domain_generic_chips(domain, IRQS_PER_BANK, 1, "exti",
handle_edge_irq, clr, 0, 0);
if (ret) {
pr_err("%pOF: Could not allocate generic interrupt chip.\n",
node);
goto out_free_domain;
}
for (i = 0; i < drv_data->bank_nr; i++) {
const struct stm32_exti_bank *stm32_bank;
struct stm32_exti_chip_data *chip_data;
stm32_bank = drv_data->exti_banks[i];
chip_data = stm32_exti_chip_init(host_data, i, node);
gc = irq_get_domain_generic_chip(domain, i * IRQS_PER_BANK);
gc->reg_base = host_data->base;
gc->chip_types->type = IRQ_TYPE_EDGE_BOTH;
gc->chip_types->chip.irq_ack = stm32_irq_ack;
gc->chip_types->chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types->chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types->chip.irq_set_type = stm32_irq_set_type;
gc->chip_types->chip.irq_set_wake = irq_gc_set_wake;
gc->suspend = stm32_irq_suspend;
gc->resume = stm32_irq_resume;
gc->wake_enabled = IRQ_MSK(IRQS_PER_BANK);
gc->chip_types->regs.mask = stm32_bank->imr_ofst;
gc->private = (void *)chip_data;
}
nr_irqs = of_irq_count(node);
for (i = 0; i < nr_irqs; i++) {
unsigned int irq = irq_of_parse_and_map(node, i);
irq_set_handler_data(irq, domain);
irq_set_chained_handler(irq, stm32_irq_handler);
}
return 0;
out_free_domain:
irq_domain_remove(domain);
out_unmap:
iounmap(host_data->base);
kfree(host_data->chips_data);
kfree(host_data);
return ret;
}
static const struct irq_domain_ops stm32_exti_h_domain_ops = {
.alloc = stm32_exti_h_domain_alloc,
.free = irq_domain_free_irqs_common,
.xlate = irq_domain_xlate_twocell,
};
static void stm32_exti_remove_irq(void *data)
{
struct irq_domain *domain = data;
irq_domain_remove(domain);
}
static int stm32_exti_remove(struct platform_device *pdev)
{
stm32_exti_h_syscore_deinit();
return 0;
}
static int stm32_exti_probe(struct platform_device *pdev)
{
int ret, i;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct irq_domain *parent_domain, *domain;
struct stm32_exti_host_data *host_data;
const struct stm32_exti_drv_data *drv_data;
host_data = devm_kzalloc(dev, sizeof(*host_data), GFP_KERNEL);
if (!host_data)
return -ENOMEM;
/* check for optional hwspinlock which may be not available yet */
ret = of_hwspin_lock_get_id(np, 0);
if (ret == -EPROBE_DEFER)
/* hwspinlock framework not yet ready */
return ret;
if (ret >= 0) {
host_data->hwlock = devm_hwspin_lock_request_specific(dev, ret);
if (!host_data->hwlock) {
dev_err(dev, "Failed to request hwspinlock\n");
return -EINVAL;
}
} else if (ret != -ENOENT) {
/* note: ENOENT is a valid case (means 'no hwspinlock') */
dev_err(dev, "Failed to get hwspinlock\n");
return ret;
}
/* initialize host_data */
drv_data = of_device_get_match_data(dev);
if (!drv_data) {
dev_err(dev, "no of match data\n");
return -ENODEV;
}
host_data->drv_data = drv_data;
host_data->chips_data = devm_kcalloc(dev, drv_data->bank_nr,
sizeof(*host_data->chips_data),
GFP_KERNEL);
if (!host_data->chips_data)
return -ENOMEM;
host_data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(host_data->base))
return PTR_ERR(host_data->base);
for (i = 0; i < drv_data->bank_nr; i++)
stm32_exti_chip_init(host_data, i, np);
parent_domain = irq_find_host(of_irq_find_parent(np));
if (!parent_domain) {
dev_err(dev, "GIC interrupt-parent not found\n");
return -EINVAL;
}
domain = irq_domain_add_hierarchy(parent_domain, 0,
drv_data->bank_nr * IRQS_PER_BANK,
np, &stm32_exti_h_domain_ops,
host_data);
if (!domain) {
dev_err(dev, "Could not register exti domain\n");
return -ENOMEM;
}
ret = devm_add_action_or_reset(dev, stm32_exti_remove_irq, domain);
if (ret)
return ret;
stm32_exti_h_syscore_init(host_data);
return 0;
}
/* platform driver only for MP1 */
static const struct of_device_id stm32_exti_ids[] = {
{ .compatible = "st,stm32mp1-exti", .data = &stm32mp1_drv_data},
{ .compatible = "st,stm32mp13-exti", .data = &stm32mp13_drv_data},
{},
};
MODULE_DEVICE_TABLE(of, stm32_exti_ids);
static struct platform_driver stm32_exti_driver = {
.probe = stm32_exti_probe,
.remove = stm32_exti_remove,
.driver = {
.name = "stm32_exti",
.of_match_table = stm32_exti_ids,
},
};
static int __init stm32_exti_arch_init(void)
{
return platform_driver_register(&stm32_exti_driver);
}
static void __exit stm32_exti_arch_exit(void)
{
return platform_driver_unregister(&stm32_exti_driver);
}
arch_initcall(stm32_exti_arch_init);
module_exit(stm32_exti_arch_exit);
/* no platform driver for F4 and H7 */
static int __init stm32f4_exti_of_init(struct device_node *np,
struct device_node *parent)
{
return stm32_exti_init(&stm32f4xx_drv_data, np);
}
IRQCHIP_DECLARE(stm32f4_exti, "st,stm32-exti", stm32f4_exti_of_init);
static int __init stm32h7_exti_of_init(struct device_node *np,
struct device_node *parent)
{
return stm32_exti_init(&stm32h7xx_drv_data, np);
}
IRQCHIP_DECLARE(stm32h7_exti, "st,stm32h7-exti", stm32h7_exti_of_init);