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// SPDX-License-Identifier: GPL-2.0-only
//
// Author: Steve Chen <schen@mvista.com>
// Copyright (C) 2008-2009, MontaVista Software, Inc. <source@mvista.com>
// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
// Copyright (C) 2019, Texas Instruments
//
// TI Common Platform Interrupt Controller (cp_intc) driver
#include <linux/export.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/irq-davinci-cp-intc.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/exception.h>
#define DAVINCI_CP_INTC_CTRL 0x04
#define DAVINCI_CP_INTC_HOST_CTRL 0x0c
#define DAVINCI_CP_INTC_GLOBAL_ENABLE 0x10
#define DAVINCI_CP_INTC_SYS_STAT_IDX_CLR 0x24
#define DAVINCI_CP_INTC_SYS_ENABLE_IDX_SET 0x28
#define DAVINCI_CP_INTC_SYS_ENABLE_IDX_CLR 0x2c
#define DAVINCI_CP_INTC_HOST_ENABLE_IDX_SET 0x34
#define DAVINCI_CP_INTC_HOST_ENABLE_IDX_CLR 0x38
#define DAVINCI_CP_INTC_PRIO_IDX 0x80
#define DAVINCI_CP_INTC_SYS_STAT_CLR(n) (0x0280 + (n << 2))
#define DAVINCI_CP_INTC_SYS_ENABLE_CLR(n) (0x0380 + (n << 2))
#define DAVINCI_CP_INTC_CHAN_MAP(n) (0x0400 + (n << 2))
#define DAVINCI_CP_INTC_SYS_POLARITY(n) (0x0d00 + (n << 2))
#define DAVINCI_CP_INTC_SYS_TYPE(n) (0x0d80 + (n << 2))
#define DAVINCI_CP_INTC_HOST_ENABLE(n) (0x1500 + (n << 2))
#define DAVINCI_CP_INTC_PRI_INDX_MASK GENMASK(9, 0)
#define DAVINCI_CP_INTC_GPIR_NONE BIT(31)
static void __iomem *davinci_cp_intc_base;
static struct irq_domain *davinci_cp_intc_irq_domain;
static inline unsigned int davinci_cp_intc_read(unsigned int offset)
{
return readl_relaxed(davinci_cp_intc_base + offset);
}
static inline void davinci_cp_intc_write(unsigned long value,
unsigned int offset)
{
writel_relaxed(value, davinci_cp_intc_base + offset);
}
static void davinci_cp_intc_ack_irq(struct irq_data *d)
{
davinci_cp_intc_write(d->hwirq, DAVINCI_CP_INTC_SYS_STAT_IDX_CLR);
}
static void davinci_cp_intc_mask_irq(struct irq_data *d)
{
/* XXX don't know why we need to disable nIRQ here... */
davinci_cp_intc_write(1, DAVINCI_CP_INTC_HOST_ENABLE_IDX_CLR);
davinci_cp_intc_write(d->hwirq, DAVINCI_CP_INTC_SYS_ENABLE_IDX_CLR);
davinci_cp_intc_write(1, DAVINCI_CP_INTC_HOST_ENABLE_IDX_SET);
}
static void davinci_cp_intc_unmask_irq(struct irq_data *d)
{
davinci_cp_intc_write(d->hwirq, DAVINCI_CP_INTC_SYS_ENABLE_IDX_SET);
}
static int davinci_cp_intc_set_irq_type(struct irq_data *d,
unsigned int flow_type)
{
unsigned int reg, mask, polarity, type;
reg = BIT_WORD(d->hwirq);
mask = BIT_MASK(d->hwirq);
polarity = davinci_cp_intc_read(DAVINCI_CP_INTC_SYS_POLARITY(reg));
type = davinci_cp_intc_read(DAVINCI_CP_INTC_SYS_TYPE(reg));
switch (flow_type) {
case IRQ_TYPE_EDGE_RISING:
polarity |= mask;
type |= mask;
break;
case IRQ_TYPE_EDGE_FALLING:
polarity &= ~mask;
type |= mask;
break;
case IRQ_TYPE_LEVEL_HIGH:
polarity |= mask;
type &= ~mask;
break;
case IRQ_TYPE_LEVEL_LOW:
polarity &= ~mask;
type &= ~mask;
break;
default:
return -EINVAL;
}
davinci_cp_intc_write(polarity, DAVINCI_CP_INTC_SYS_POLARITY(reg));
davinci_cp_intc_write(type, DAVINCI_CP_INTC_SYS_TYPE(reg));
return 0;
}
static struct irq_chip davinci_cp_intc_irq_chip = {
.name = "cp_intc",
.irq_ack = davinci_cp_intc_ack_irq,
.irq_mask = davinci_cp_intc_mask_irq,
.irq_unmask = davinci_cp_intc_unmask_irq,
.irq_set_type = davinci_cp_intc_set_irq_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static asmlinkage void __exception_irq_entry
davinci_cp_intc_handle_irq(struct pt_regs *regs)
{
int gpir, irqnr, none;
/*
* The interrupt number is in first ten bits. The NONE field set to 1
* indicates a spurious irq.
*/
gpir = davinci_cp_intc_read(DAVINCI_CP_INTC_PRIO_IDX);
irqnr = gpir & DAVINCI_CP_INTC_PRI_INDX_MASK;
none = gpir & DAVINCI_CP_INTC_GPIR_NONE;
if (unlikely(none)) {
pr_err_once("%s: spurious irq!\n", __func__);
return;
}
generic_handle_domain_irq(davinci_cp_intc_irq_domain, irqnr);
}
static int davinci_cp_intc_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw);
irq_set_chip(virq, &davinci_cp_intc_irq_chip);
irq_set_probe(virq);
irq_set_handler(virq, handle_edge_irq);
return 0;
}
static const struct irq_domain_ops davinci_cp_intc_irq_domain_ops = {
.map = davinci_cp_intc_host_map,
.xlate = irq_domain_xlate_onetwocell,
};
static int __init
davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
struct device_node *node)
{
unsigned int num_regs = BITS_TO_LONGS(config->num_irqs);
int offset, irq_base;
void __iomem *req;
req = request_mem_region(config->reg.start,
resource_size(&config->reg),
"davinci-cp-intc");
if (!req) {
pr_err("%s: register range busy\n", __func__);
return -EBUSY;
}
davinci_cp_intc_base = ioremap(config->reg.start,
resource_size(&config->reg));
if (!davinci_cp_intc_base) {
pr_err("%s: unable to ioremap register range\n", __func__);
return -EINVAL;
}
davinci_cp_intc_write(0, DAVINCI_CP_INTC_GLOBAL_ENABLE);
/* Disable all host interrupts */
davinci_cp_intc_write(0, DAVINCI_CP_INTC_HOST_ENABLE(0));
/* Disable system interrupts */
for (offset = 0; offset < num_regs; offset++)
davinci_cp_intc_write(~0,
DAVINCI_CP_INTC_SYS_ENABLE_CLR(offset));
/* Set to normal mode, no nesting, no priority hold */
davinci_cp_intc_write(0, DAVINCI_CP_INTC_CTRL);
davinci_cp_intc_write(0, DAVINCI_CP_INTC_HOST_CTRL);
/* Clear system interrupt status */
for (offset = 0; offset < num_regs; offset++)
davinci_cp_intc_write(~0,
DAVINCI_CP_INTC_SYS_STAT_CLR(offset));
/* Enable nIRQ (what about nFIQ?) */
davinci_cp_intc_write(1, DAVINCI_CP_INTC_HOST_ENABLE_IDX_SET);
/* Default all priorities to channel 7. */
num_regs = (config->num_irqs + 3) >> 2; /* 4 channels per register */
for (offset = 0; offset < num_regs; offset++)
davinci_cp_intc_write(0x07070707,
DAVINCI_CP_INTC_CHAN_MAP(offset));
irq_base = irq_alloc_descs(-1, 0, config->num_irqs, 0);
if (irq_base < 0) {
pr_err("%s: unable to allocate interrupt descriptors: %d\n",
__func__, irq_base);
return irq_base;
}
davinci_cp_intc_irq_domain = irq_domain_add_legacy(
node, config->num_irqs, irq_base, 0,
&davinci_cp_intc_irq_domain_ops, NULL);
if (!davinci_cp_intc_irq_domain) {
pr_err("%s: unable to create an interrupt domain\n", __func__);
return -EINVAL;
}
set_handle_irq(davinci_cp_intc_handle_irq);
/* Enable global interrupt */
davinci_cp_intc_write(1, DAVINCI_CP_INTC_GLOBAL_ENABLE);
return 0;
}
int __init davinci_cp_intc_init(const struct davinci_cp_intc_config *config)
{
return davinci_cp_intc_do_init(config, NULL);
}
static int __init davinci_cp_intc_of_init(struct device_node *node,
struct device_node *parent)
{
struct davinci_cp_intc_config config = { };
int ret;
ret = of_address_to_resource(node, 0, &config.reg);
if (ret) {
pr_err("%s: unable to get the register range from device-tree\n",
__func__);
return ret;
}
ret = of_property_read_u32(node, "ti,intc-size", &config.num_irqs);
if (ret) {
pr_err("%s: unable to read the 'ti,intc-size' property\n",
__func__);
return ret;
}
return davinci_cp_intc_do_init(&config, node);
}
IRQCHIP_DECLARE(cp_intc, "ti,cp-intc", davinci_cp_intc_of_init);
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