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/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*
* 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.
*
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <asm/proc-fns.h>
#include "pmc.h"
void __iomem *at91_pmc_base;
EXPORT_SYMBOL_GPL(at91_pmc_base);
void at91rm9200_idle(void)
{
/*
* Disable the processor clock. The processor will be automatically
* re-enabled by an interrupt or by a reset.
*/
at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
}
void at91sam9_idle(void)
{
at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
cpu_do_idle();
}
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range)
{
u32 min, max;
int ret;
ret = of_property_read_u32_index(np, propname, 0, &min);
if (ret)
return ret;
ret = of_property_read_u32_index(np, propname, 1, &max);
if (ret)
return ret;
if (range) {
range->min = min;
range->max = max;
}
return 0;
}
EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
static void pmc_irq_mask(struct irq_data *d)
{
struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
regmap_write(pmc->regmap, AT91_PMC_IDR, 1 << d->hwirq);
}
static void pmc_irq_unmask(struct irq_data *d)
{
struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
regmap_write(pmc->regmap, AT91_PMC_IER, 1 << d->hwirq);
}
static int pmc_irq_set_type(struct irq_data *d, unsigned type)
{
if (type != IRQ_TYPE_LEVEL_HIGH) {
pr_warn("PMC: type not supported (support only IRQ_TYPE_LEVEL_HIGH type)\n");
return -EINVAL;
}
return 0;
}
static void pmc_irq_suspend(struct irq_data *d)
{
struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
regmap_read(pmc->regmap, AT91_PMC_IMR, &pmc->imr);
regmap_write(pmc->regmap, AT91_PMC_IDR, pmc->imr);
}
static void pmc_irq_resume(struct irq_data *d)
{
struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
regmap_write(pmc->regmap, AT91_PMC_IER, pmc->imr);
}
static struct irq_chip pmc_irq = {
.name = "PMC",
.irq_disable = pmc_irq_mask,
.irq_mask = pmc_irq_mask,
.irq_unmask = pmc_irq_unmask,
.irq_set_type = pmc_irq_set_type,
.irq_suspend = pmc_irq_suspend,
.irq_resume = pmc_irq_resume,
};
static struct lock_class_key pmc_lock_class;
static int pmc_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct at91_pmc *pmc = h->host_data;
irq_set_lockdep_class(virq, &pmc_lock_class);
irq_set_chip_and_handler(virq, &pmc_irq,
handle_level_irq);
irq_set_chip_data(virq, pmc);
return 0;
}
static int pmc_irq_domain_xlate(struct irq_domain *d,
struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_type)
{
struct at91_pmc *pmc = d->host_data;
const struct at91_pmc_caps *caps = pmc->caps;
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = intspec[0];
if (!(caps->available_irqs & (1 << *out_hwirq)))
return -EINVAL;
*out_type = IRQ_TYPE_LEVEL_HIGH;
return 0;
}
static const struct irq_domain_ops pmc_irq_ops = {
.map = pmc_irq_map,
.xlate = pmc_irq_domain_xlate,
};
static irqreturn_t pmc_irq_handler(int irq, void *data)
{
struct at91_pmc *pmc = (struct at91_pmc *)data;
unsigned int tmpsr, imr;
unsigned long sr;
int n;
regmap_read(pmc->regmap, AT91_PMC_SR, &tmpsr);
regmap_read(pmc->regmap, AT91_PMC_IMR, &imr);
sr = tmpsr & imr;
if (!sr)
return IRQ_NONE;
for_each_set_bit(n, &sr, BITS_PER_LONG)
generic_handle_irq(irq_find_mapping(pmc->irqdomain, n));
return IRQ_HANDLED;
}
static const struct at91_pmc_caps at91rm9200_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
AT91_PMC_PCK3RDY,
};
static const struct at91_pmc_caps at91sam9260_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY,
};
static const struct at91_pmc_caps at91sam9g45_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY,
};
static const struct at91_pmc_caps at91sam9n12_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
};
static const struct at91_pmc_caps at91sam9x5_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
};
static const struct at91_pmc_caps sama5d2_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
AT91_PMC_CFDEV | AT91_PMC_GCKRDY,
};
static const struct at91_pmc_caps sama5d3_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
AT91_PMC_CFDEV,
};
static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
struct regmap *regmap,
void __iomem *regbase, int virq,
const struct at91_pmc_caps *caps)
{
struct at91_pmc *pmc;
if (!regbase || !virq || !caps)
return NULL;
at91_pmc_base = regbase;
pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
if (!pmc)
return NULL;
pmc->regmap = regmap;
pmc->virq = virq;
pmc->caps = caps;
pmc->irqdomain = irq_domain_add_linear(np, 32, &pmc_irq_ops, pmc);
if (!pmc->irqdomain)
goto out_free_pmc;
regmap_write(pmc->regmap, AT91_PMC_IDR, 0xffffffff);
if (request_irq(pmc->virq, pmc_irq_handler,
IRQF_SHARED | IRQF_COND_SUSPEND, "pmc", pmc))
goto out_remove_irqdomain;
return pmc;
out_remove_irqdomain:
irq_domain_remove(pmc->irqdomain);
out_free_pmc:
kfree(pmc);
return NULL;
}
static void __init of_at91_pmc_setup(struct device_node *np,
const struct at91_pmc_caps *caps)
{
struct at91_pmc *pmc;
void __iomem *regbase = of_iomap(np, 0);
struct regmap *regmap;
int virq;
regmap = syscon_node_to_regmap(np);
if (IS_ERR(regmap))
panic("Could not retrieve syscon regmap");
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