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Commit 6dd64ee1 authored by Ludovic Barre's avatar Ludovic Barre Committed by Marc Zyngier
Browse files

irqchip/stm32: Add multi-bank management 



-Prepare to manage multi-bank of external interrupts
(N banks of 32 inputs).
-Prepare to manage registers offsets by compatible
(registers offsets could be different follow per stm32 platform).

Signed-off-by: default avatarLudovic Barre <ludovic.barre@st.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 0e7d7807

drivers/irqchip/irq-stm32-exti.c

+103 −46
Original line number Diff line number Diff line
@@ -14,27 +14,66 @@ 
#include <linux/of_address.h>

#include <linux/of_irq.h>



#define EXTI_IMR	0x0

#define EXTI_EMR	0x4

#define EXTI_RTSR	0x8

#define EXTI_FTSR	0xc

#define EXTI_SWIER	0x10

#define EXTI_PR		0x14

#define IRQS_PER_BANK 32



struct stm32_exti_bank {

	u32 imr_ofst;

	u32 emr_ofst;

	u32 rtsr_ofst;

	u32 ftsr_ofst;

	u32 swier_ofst;

	u32 pr_ofst;

};



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,

};



static const struct stm32_exti_bank *stm32f4xx_exti_banks[] = {

	&stm32f4xx_exti_b1,

};



static unsigned long stm32_exti_pending(struct irq_chip_generic *gc)

{

	const struct stm32_exti_bank *stm32_bank = gc->private;



	return irq_reg_readl(gc, stm32_bank->pr_ofst);

}



static void stm32_exti_irq_ack(struct irq_chip_generic *gc, u32 mask)

{

	const struct stm32_exti_bank *stm32_bank = gc->private;



	irq_reg_writel(gc, mask, stm32_bank->pr_ofst);

}



static void stm32_irq_handler(struct irq_desc *desc)

{

	struct irq_domain *domain = irq_desc_get_handler_data(desc);

	struct irq_chip_generic *gc = domain->gc->gc[0];

	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;

	int n, i, irq_base = 0;



	chained_irq_enter(chip, desc);



	while ((pending = irq_reg_readl(gc, EXTI_PR))) {

		for_each_set_bit(n, &pending, BITS_PER_LONG) {

			generic_handle_irq(irq_find_mapping(domain, n));

			irq_reg_writel(gc, BIT(n), EXTI_PR);

	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) {

				virq = irq_find_mapping(domain, irq_base + n);

				generic_handle_irq(virq);

				stm32_exti_irq_ack(gc, BIT(n));

			}

		}

	}
@@ -44,13 +83,14 @@ static void stm32_irq_handler(struct irq_desc *desc) 
static int stm32_irq_set_type(struct irq_data *data, unsigned int type)

{

	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);

	int pin = data->hwirq;

	const struct stm32_exti_bank *stm32_bank = gc->private;

	int pin = data->hwirq % IRQS_PER_BANK;

	u32 rtsr, ftsr;



	irq_gc_lock(gc);



	rtsr = irq_reg_readl(gc, EXTI_RTSR);

	ftsr = irq_reg_readl(gc, EXTI_FTSR);

	rtsr = irq_reg_readl(gc, stm32_bank->rtsr_ofst);

	ftsr = irq_reg_readl(gc, stm32_bank->ftsr_ofst);



	switch (type) {

	case IRQ_TYPE_EDGE_RISING:
@@ -70,8 +110,8 @@ static int stm32_irq_set_type(struct irq_data *data, unsigned int type) 
		return -EINVAL;

	}



	irq_reg_writel(gc, rtsr, EXTI_RTSR);

	irq_reg_writel(gc, ftsr, EXTI_FTSR);

	irq_reg_writel(gc, rtsr, stm32_bank->rtsr_ofst);

	irq_reg_writel(gc, ftsr, stm32_bank->ftsr_ofst);



	irq_gc_unlock(gc);
@@ -81,17 +121,18 @@ static int stm32_irq_set_type(struct irq_data *data, unsigned int type) 
static int stm32_irq_set_wake(struct irq_data *data, unsigned int on)

{

	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);

	int pin = data->hwirq;

	const struct stm32_exti_bank *stm32_bank = gc->private;

	int pin = data->hwirq % IRQS_PER_BANK;

	u32 emr;



	irq_gc_lock(gc);



	emr = irq_reg_readl(gc, EXTI_EMR);

	emr = irq_reg_readl(gc, stm32_bank->emr_ofst);

	if (on)

		emr |= BIT(pin);

	else

		emr &= ~BIT(pin);

	irq_reg_writel(gc, emr, EXTI_EMR);

	irq_reg_writel(gc, emr, stm32_bank->emr_ofst);



	irq_gc_unlock(gc);
@@ -101,11 +142,12 @@ static int stm32_irq_set_wake(struct irq_data *data, unsigned int on) 
static int stm32_exti_alloc(struct irq_domain *d, unsigned int virq,

			    unsigned int nr_irqs, void *data)

{

	struct irq_chip_generic *gc = d->gc->gc[0];

	struct irq_chip_generic *gc;

	struct irq_fwspec *fwspec = data;

	irq_hw_number_t hwirq;



	hwirq = fwspec->param[0];

	gc = irq_get_domain_generic_chip(d, hwirq);



	irq_map_generic_chip(d, virq, hwirq);

	irq_domain_set_info(d, virq, hwirq, &gc->chip_types->chip, gc,
@@ -129,8 +171,9 @@ struct irq_domain_ops irq_exti_domain_ops = { 
	.free	= stm32_exti_free,

};



static int __init stm32_exti_init(struct device_node *node,

				  struct device_node *parent)

static int

__init stm32_exti_init(const struct stm32_exti_bank **stm32_exti_banks,

		       int bank_nr, struct device_node *node)

{

	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;

	int nr_irqs, nr_exti, ret, i;
@@ -144,14 +187,7 @@ static int __init stm32_exti_init(struct device_node *node, 
		return -ENOMEM;

	}



	/* Determine number of irqs supported */

	writel_relaxed(~0UL, base + EXTI_RTSR);

	nr_exti = fls(readl_relaxed(base + EXTI_RTSR));

	writel_relaxed(0, base + EXTI_RTSR);



	pr_info("%pOF: %d External IRQs detected\n", node, nr_exti);



	domain = irq_domain_add_linear(node, nr_exti,

	domain = irq_domain_add_linear(node, bank_nr * IRQS_PER_BANK,

				       &irq_exti_domain_ops, NULL);

	if (!domain) {

		pr_err("%s: Could not register interrupt domain.\n",
@@ -160,7 +196,7 @@ static int __init stm32_exti_init(struct device_node *node, 
		goto out_unmap;

	}



	ret = irq_alloc_domain_generic_chips(domain, nr_exti, 1, "exti",

	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",
@@ -168,18 +204,32 @@ static int __init stm32_exti_init(struct device_node *node, 
		goto out_free_domain;

	}



	gc = domain->gc->gc[0];

	for (i = 0; i < bank_nr; i++) {

		const struct stm32_exti_bank *stm32_bank = stm32_exti_banks[i];

		u32 irqs_mask;



		gc = irq_get_domain_generic_chip(domain, i * IRQS_PER_BANK);



		gc->reg_base = base;

		gc->chip_types->type = IRQ_TYPE_EDGE_BOTH;

	gc->chip_types->chip.name          = gc->chip_types[0].chip.name;

		gc->chip_types->chip.irq_ack = irq_gc_ack_set_bit;

		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           = EXTI_PR;

	gc->chip_types->regs.mask          = EXTI_IMR;

	gc->chip_types->handler            = handle_edge_irq;

		gc->chip_types->regs.ack = stm32_bank->pr_ofst;

		gc->chip_types->regs.mask = stm32_bank->imr_ofst;

		gc->private = (void *)stm32_bank;



		/* Determine number of irqs supported */

		writel_relaxed(~0UL, base + stm32_bank->rtsr_ofst);

		irqs_mask = readl_relaxed(base + stm32_bank->rtsr_ofst);

		nr_exti = fls(readl_relaxed(base + stm32_bank->rtsr_ofst));

		writel_relaxed(0, base + stm32_bank->rtsr_ofst);



		pr_info("%s: bank%d, External IRQs available:%#x\n",

			node->full_name, i, irqs_mask);

	}



	nr_irqs = of_irq_count(node);

	for (i = 0; i < nr_irqs; i++) {
@@ -198,4 +248,11 @@ static int __init stm32_exti_init(struct device_node *node, 
	return ret;

}



IRQCHIP_DECLARE(stm32_exti, "st,stm32-exti", stm32_exti_init);
 
static int __init stm32f4_exti_of_init(struct device_node *np,

				       struct device_node *parent)

{

	return stm32_exti_init(stm32f4xx_exti_banks,

			ARRAY_SIZE(stm32f4xx_exti_banks), np);

}



IRQCHIP_DECLARE(stm32f4_exti, "st,stm32-exti", stm32f4_exti_of_init);