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irqchip/stm32: Add falling pending register support

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This patch adds support of rising/falling pending registers.
Falling pending register (fpr) is needed for next revision.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Ludovic Barre 2018-04-26 18:18:26 +02:00 committed by Marc Zyngier
parent ea80aa2a1a
commit be6230f0c2
1 changed files with 36 additions and 11 deletions
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47
drivers/irqchip/irq-stm32-exti.c
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@ -23,16 +23,20 @@ struct stm32_exti_bank {
u32 rtsr_ofst;
u32 ftsr_ofst;
u32 swier_ofst;
u32 pr_ofst;
u32 rpr_ofst;
u32 fpr_ofst;
};
#define UNDEF_REG ~0
static const struct stm32_exti_bank stm32f4xx_exti_b1 = {
.imr_ofst = 0x00,
.emr_ofst = 0x04,
.rtsr_ofst = 0x08,
.ftsr_ofst = 0x0C,
.swier_ofst = 0x10,
.pr_ofst = 0x14,
.rpr_ofst = 0x14,
.fpr_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank *stm32f4xx_exti_banks[] = {
@ -45,7 +49,8 @@ static const struct stm32_exti_bank stm32h7xx_exti_b1 = {
.rtsr_ofst = 0x00,
.ftsr_ofst = 0x04,
.swier_ofst = 0x08,
.pr_ofst = 0x88,
.rpr_ofst = 0x88,
.fpr_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
@ -54,7 +59,8 @@ static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
.rtsr_ofst = 0x20,
.ftsr_ofst = 0x24,
.swier_ofst = 0x28,
.pr_ofst = 0x98,
.rpr_ofst = 0x98,
.fpr_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
@ -63,7 +69,8 @@ static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
.rtsr_ofst = 0x40,
.ftsr_ofst = 0x44,
.swier_ofst = 0x48,
.pr_ofst = 0xA8,
.rpr_ofst = 0xA8,
.fpr_ofst = UNDEF_REG,
};
static const struct stm32_exti_bank *stm32h7xx_exti_banks[] = {
@ -75,8 +82,13 @@ static const struct stm32_exti_bank *stm32h7xx_exti_banks[] = {
static unsigned long stm32_exti_pending(struct irq_chip_generic *gc)
{
const struct stm32_exti_bank *stm32_bank = gc->private;
unsigned long pending;
return irq_reg_readl(gc, stm32_bank->pr_ofst);
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)
@ -85,7 +97,6 @@ static void stm32_irq_handler(struct irq_desc *desc)
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int virq, nbanks = domain->gc->num_chips;
struct irq_chip_generic *gc;
const struct stm32_exti_bank *stm32_bank;
unsigned long pending;
int n, i, irq_base = 0;
@ -93,7 +104,6 @@ static void stm32_irq_handler(struct irq_desc *desc)
for (i = 0; i < nbanks; i++, irq_base += IRQS_PER_BANK) {
gc = irq_get_domain_generic_chip(domain, irq_base);
stm32_bank = gc->private;
while ((pending = stm32_exti_pending(gc))) {
for_each_set_bit(n, &pending, IRQS_PER_BANK) {
@ -192,6 +202,20 @@ static const struct irq_domain_ops irq_exti_domain_ops = {
.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);
const struct stm32_exti_bank *stm32_bank = gc->private;
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);
}
static int
__init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,
int bank_nr, struct device_node *node)
@ -233,12 +257,11 @@ __init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,
gc->reg_base = base;
gc->chip_types->type = IRQ_TYPE_EDGE_BOTH;
gc->chip_types->chip.irq_ack = irq_gc_ack_set_bit;
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 = stm32_irq_set_wake;
gc->chip_types->regs.ack = stm32_bank->pr_ofst;
gc->chip_types->regs.mask = stm32_bank->imr_ofst;
gc->private = (void *)stm32_bank;
@ -255,7 +278,9 @@ __init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,
writel_relaxed(0, base + stm32_bank->emr_ofst);
writel_relaxed(0, base + stm32_bank->rtsr_ofst);
writel_relaxed(0, base + stm32_bank->ftsr_ofst);
writel_relaxed(~0UL, base + stm32_bank->pr_ofst);
writel_relaxed(~0UL, base + stm32_bank->rpr_ofst);
if (stm32_bank->fpr_ofst != UNDEF_REG)
writel_relaxed(~0UL, base + stm32_bank->fpr_ofst);
pr_info("%s: bank%d, External IRQs available:%#x\n",
node->full_name, i, irqs_mask);