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/*
* Intel Reference Systems cplds
*
* Copyright (C) 2014 Robert Jarzmik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Cplds motherboard driver, supporting lubbock and mainstone SoC board.
*/
#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#define FPGA_IRQ_MASK_EN 0x0
#define FPGA_IRQ_SET_CLR 0x10
#define CPLDS_NB_IRQ 32
struct cplds {
void __iomem *base;
int irq;
unsigned int irq_mask;
struct gpio_desc *gpio0;
struct irq_domain *irqdomain;
};
static irqreturn_t cplds_irq_handler(int in_irq, void *d)
{
struct cplds *fpga = d;
unsigned long pending;
unsigned int bit;
do {
pending = readl(fpga->base + FPGA_IRQ_SET_CLR) & fpga->irq_mask;
for_each_set_bit(bit, &pending, CPLDS_NB_IRQ) {
generic_handle_irq(irq_find_mapping(fpga->irqdomain,
bit));
}
} while (pending);
return IRQ_HANDLED;
}
static void cplds_irq_mask(struct irq_data *d)
{
struct cplds *fpga = irq_data_get_irq_chip_data(d);
unsigned int cplds_irq = irqd_to_hwirq(d);
unsigned int bit = BIT(cplds_irq);
fpga->irq_mask &= ~bit;
writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
}
static void cplds_irq_unmask(struct irq_data *d)
{
struct cplds *fpga = irq_data_get_irq_chip_data(d);
unsigned int cplds_irq = irqd_to_hwirq(d);
unsigned int set, bit = BIT(cplds_irq);
set = readl(fpga->base + FPGA_IRQ_SET_CLR);
writel(set & ~bit, fpga->base + FPGA_IRQ_SET_CLR);
fpga->irq_mask |= bit;
writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
}
static struct irq_chip cplds_irq_chip = {
.name = "pxa_cplds",
.irq_ack = cplds_irq_mask,
.irq_mask = cplds_irq_mask,
.irq_unmask = cplds_irq_unmask,
.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
};
static int cplds_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
struct cplds *fpga = d->host_data;
irq_set_chip_and_handler(irq, &cplds_irq_chip, handle_level_irq);
irq_set_chip_data(irq, fpga);
return 0;
}
static const struct irq_domain_ops cplds_irq_domain_ops = {
.xlate = irq_domain_xlate_twocell,
.map = cplds_irq_domain_map,
};
static int cplds_resume(struct platform_device *pdev)
{
struct cplds *fpga = platform_get_drvdata(pdev);
writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
return 0;
}
static int cplds_probe(struct platform_device *pdev)
{
struct resource *res;
struct cplds *fpga;
int ret;
int base_irq;
unsigned long irqflags = 0;
fpga = devm_kzalloc(&pdev->dev, sizeof(*fpga), GFP_KERNEL);
if (!fpga)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res) {
fpga->irq = (unsigned int)res->start;
irqflags = res->flags;
}
if (!fpga->irq)
return -ENODEV;
base_irq = platform_get_irq(pdev, 1);
if (base_irq < 0)
base_irq = 0;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
fpga->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(fpga->base))
return PTR_ERR(fpga->base);
platform_set_drvdata(pdev, fpga);
writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
writel(0, fpga->base + FPGA_IRQ_SET_CLR);
ret = devm_request_irq(&pdev->dev, fpga->irq, cplds_irq_handler,
irqflags, dev_name(&pdev->dev), fpga);
if (ret == -ENOSYS)
return -EPROBE_DEFER;
if (ret) {
dev_err(&pdev->dev, "couldn't request main irq%d: %d\n",
fpga->irq, ret);
return ret;
}
irq_set_irq_wake(fpga->irq, 1);
fpga->irqdomain = irq_domain_add_linear(pdev->dev.of_node,
CPLDS_NB_IRQ,
&cplds_irq_domain_ops, fpga);
if (!fpga->irqdomain)
return -ENODEV;
if (base_irq) {
ret = irq_create_strict_mappings(fpga->irqdomain, base_irq, 0,
CPLDS_NB_IRQ);
if (ret) {
dev_err(&pdev->dev, "couldn't create the irq mapping %d..%d\n",
base_irq, base_irq + CPLDS_NB_IRQ);
return ret;
}
}
return 0;
}
static int cplds_remove(struct platform_device *pdev)
{
struct cplds *fpga = platform_get_drvdata(pdev);
irq_set_chip_and_handler(fpga->irq, NULL, NULL);
return 0;
}
static const struct of_device_id cplds_id_table[] = {
{ .compatible = "intel,lubbock-cplds-irqs", },
{ .compatible = "intel,mainstone-cplds-irqs", },
{ }
};
MODULE_DEVICE_TABLE(of, cplds_id_table);
static struct platform_driver cplds_driver = {
.driver = {
.name = "pxa_cplds_irqs",
.of_match_table = of_match_ptr(cplds_id_table),
},
.probe = cplds_probe,
.remove = cplds_remove,
.resume = cplds_resume,
};
module_platform_driver(cplds_driver);
MODULE_DESCRIPTION("PXA Cplds interrupts driver");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_LICENSE("GPL");
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