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/*
* Copyright (C) 2014 STMicroelectronics – All Rights Reserved
*
* Author: Lee Jones <lee.jones@linaro.org>
*
* This is a re-write of Christophe Kerello's PMU driver.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <dt-bindings/interrupt-controller/irq-st.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define STIH415_SYSCFG_642 0x0a8
#define STIH416_SYSCFG_7543 0x87c
#define STIH407_SYSCFG_5102 0x198
#define STID127_SYSCFG_734 0x088
#define ST_A9_IRQ_MASK 0x001FFFFF
#define ST_A9_IRQ_MAX_CHANS 2
#define ST_A9_IRQ_EN_CTI_0 BIT(0)
#define ST_A9_IRQ_EN_CTI_1 BIT(1)
#define ST_A9_IRQ_EN_PMU_0 BIT(2)
#define ST_A9_IRQ_EN_PMU_1 BIT(3)
#define ST_A9_IRQ_EN_PL310_L2 BIT(4)
#define ST_A9_IRQ_EN_EXT_0 BIT(5)
#define ST_A9_IRQ_EN_EXT_1 BIT(6)
#define ST_A9_IRQ_EN_EXT_2 BIT(7)
#define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3)))
#define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3)))
#define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20)
struct st_irq_syscfg {
struct regmap *regmap;
unsigned int syscfg;
unsigned int config;
bool ext_inverted;
};
static const struct of_device_id st_irq_syscfg_match[] = {
{
.compatible = "st,stih415-irq-syscfg",
.data = (void *)STIH415_SYSCFG_642,
},
{
.compatible = "st,stih416-irq-syscfg",
.data = (void *)STIH416_SYSCFG_7543,
},
{
.compatible = "st,stih407-irq-syscfg",
.data = (void *)STIH407_SYSCFG_5102,
},
{
.compatible = "st,stid127-irq-syscfg",
.data = (void *)STID127_SYSCFG_734,
},
{}
};
static int st_irq_xlate(struct platform_device *pdev,
int device, int channel, bool irq)
{
struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
/* Set the device enable bit. */
switch (device) {
case ST_IRQ_SYSCFG_EXT_0:
ddata->config |= ST_A9_IRQ_EN_EXT_0;
break;
case ST_IRQ_SYSCFG_EXT_1:
ddata->config |= ST_A9_IRQ_EN_EXT_1;
break;
case ST_IRQ_SYSCFG_EXT_2:
ddata->config |= ST_A9_IRQ_EN_EXT_2;
break;
case ST_IRQ_SYSCFG_CTI_0:
ddata->config |= ST_A9_IRQ_EN_CTI_0;
break;
case ST_IRQ_SYSCFG_CTI_1:
ddata->config |= ST_A9_IRQ_EN_CTI_1;
break;
case ST_IRQ_SYSCFG_PMU_0:
ddata->config |= ST_A9_IRQ_EN_PMU_0;
break;
case ST_IRQ_SYSCFG_PMU_1:
ddata->config |= ST_A9_IRQ_EN_PMU_1;
break;
case ST_IRQ_SYSCFG_pl310_L2:
ddata->config |= ST_A9_IRQ_EN_PL310_L2;
break;
case ST_IRQ_SYSCFG_DISABLED:
return 0;
default:
dev_err(&pdev->dev, "Unrecognised device %d\n", device);
return -EINVAL;
}
/* Select IRQ/FIQ channel for device. */
ddata->config |= irq ?
ST_A9_IRQ_N_SEL(device, channel) :
ST_A9_FIQ_N_SEL(device, channel);
return 0;
}
static int st_irq_syscfg_enable(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
int channels, ret, i;
u32 device, invert;
channels = of_property_count_u32_elems(np, "st,irq-device");
if (channels != ST_A9_IRQ_MAX_CHANS) {
dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
return -EINVAL;
}
channels = of_property_count_u32_elems(np, "st,fiq-device");
if (channels != ST_A9_IRQ_MAX_CHANS) {
dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
return -EINVAL;
}
for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
of_property_read_u32_index(np, "st,irq-device", i, &device);
ret = st_irq_xlate(pdev, device, i, true);
if (ret)
return ret;
of_property_read_u32_index(np, "st,fiq-device", i, &device);
ret = st_irq_xlate(pdev, device, i, false);
if (ret)
return ret;
}
/* External IRQs may be inverted. */
of_property_read_u32(np, "st,invert-ext", &invert);
ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
return regmap_update_bits(ddata->regmap, ddata->syscfg,
ST_A9_IRQ_MASK, ddata->config);
}
static int st_irq_syscfg_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *match;
struct st_irq_syscfg *ddata;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
match = of_match_device(st_irq_syscfg_match, &pdev->dev);
if (!match)
return -ENODEV;
ddata->syscfg = (unsigned int)match->data;
ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(ddata->regmap)) {
dev_err(&pdev->dev, "syscfg phandle missing\n");
return PTR_ERR(ddata->regmap);
}
dev_set_drvdata(&pdev->dev, ddata);
return st_irq_syscfg_enable(pdev);
}
static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
{
struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
return regmap_update_bits(ddata->regmap, ddata->syscfg,
ST_A9_IRQ_MASK, ddata->config);
}
static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
static struct platform_driver st_irq_syscfg_driver = {
.driver = {
.name = "st_irq_syscfg",
.pm = &st_irq_syscfg_pm_ops,
.of_match_table = st_irq_syscfg_match,
},
.probe = st_irq_syscfg_probe,
};
static int __init st_irq_syscfg_init(void)
{
return platform_driver_register(&st_irq_syscfg_driver);
}
core_initcall(st_irq_syscfg_init);
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