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/*
* Copyright (C) 2014-2015 Toradex AG
* Author: Stefan Agner <stefan@agner.ch>
*
* 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.
*
*
* IRQ chip driver for MSCM interrupt router available on Vybrid SoC's.
* The interrupt router is between the CPU's interrupt controller and the
* peripheral. The router allows to route the peripheral interrupts to
* one of the two available CPU's on Vybrid VF6xx SoC's (Cortex-A5 or
* Cortex-M4). The router will be configured transparently on a IRQ
* request.
*
* o All peripheral interrupts of the Vybrid SoC can be routed to
* CPU 0, CPU 1 or both. The routing is useful for dual-core
* variants of Vybrid SoC such as VF6xx. This driver routes the
* requested interrupt to the CPU currently running on.
*
* o It is required to setup the interrupt router even on single-core
* variants of Vybrid.
*/
#include <linux/cpu_pm.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/mfd/syscon.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#define MSCM_CPxNUM 0x4
#define MSCM_IRSPRC(n) (0x80 + 2 * (n))
#define MSCM_IRSPRC_CPEN_MASK 0x3
#define MSCM_IRSPRC_NUM 112
struct vf610_mscm_ir_chip_data {
void __iomem *mscm_ir_base;
u16 cpu_mask;
u16 saved_irsprc[MSCM_IRSPRC_NUM];
bool is_nvic;
};
static struct vf610_mscm_ir_chip_data *mscm_ir_data;
static inline void vf610_mscm_ir_save(struct vf610_mscm_ir_chip_data *data)
{
int i;
for (i = 0; i < MSCM_IRSPRC_NUM; i++)
data->saved_irsprc[i] = readw_relaxed(data->mscm_ir_base + MSCM_IRSPRC(i));
}
static inline void vf610_mscm_ir_restore(struct vf610_mscm_ir_chip_data *data)
{
int i;
for (i = 0; i < MSCM_IRSPRC_NUM; i++)
writew_relaxed(data->saved_irsprc[i], data->mscm_ir_base + MSCM_IRSPRC(i));
}
static int vf610_mscm_ir_notifier(struct notifier_block *self,
unsigned long cmd, void *v)
{
switch (cmd) {
case CPU_CLUSTER_PM_ENTER:
vf610_mscm_ir_save(mscm_ir_data);
break;
case CPU_CLUSTER_PM_ENTER_FAILED:
case CPU_CLUSTER_PM_EXIT:
vf610_mscm_ir_restore(mscm_ir_data);
break;
}
return NOTIFY_OK;
}
static struct notifier_block mscm_ir_notifier_block = {
.notifier_call = vf610_mscm_ir_notifier,
};
static void vf610_mscm_ir_enable(struct irq_data *data)
{
irq_hw_number_t hwirq = data->hwirq;
struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;
u16 irsprc;
irsprc = readw_relaxed(chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irsprc &= MSCM_IRSPRC_CPEN_MASK;
WARN_ON(irsprc & ~chip_data->cpu_mask);
writew_relaxed(chip_data->cpu_mask,
chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_enable_parent(data);
}
static void vf610_mscm_ir_disable(struct irq_data *data)
{
irq_hw_number_t hwirq = data->hwirq;
struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;
writew_relaxed(0x0, chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
irq_chip_disable_parent(data);
}
static struct irq_chip vf610_mscm_ir_irq_chip = {
.name = "mscm-ir",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_enable = vf610_mscm_ir_enable,
.irq_disable = vf610_mscm_ir_disable,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_set_affinity = irq_chip_set_affinity_parent,
};
static int vf610_mscm_ir_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
int i;
irq_hw_number_t hwirq;
struct of_phandle_args *irq_data = arg;
struct of_phandle_args gic_data;
if (irq_data->args_count != 2)
return -EINVAL;
hwirq = irq_data->args[0];
for (i = 0; i < nr_irqs; i++)
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
&vf610_mscm_ir_irq_chip,
domain->host_data);
gic_data.np = irq_domain_get_of_node(domain->parent);
if (mscm_ir_data->is_nvic) {
gic_data.args_count = 1;
gic_data.args[0] = irq_data->args[0];
} else {
gic_data.args_count = 3;
gic_data.args[0] = GIC_SPI;
gic_data.args[1] = irq_data->args[0];
gic_data.args[2] = irq_data->args[1];
}
return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data);
}
static const struct irq_domain_ops mscm_irq_domain_ops = {
.xlate = irq_domain_xlate_twocell,
.alloc = vf610_mscm_ir_domain_alloc,
.free = irq_domain_free_irqs_common,
};
static int __init vf610_mscm_ir_of_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *domain, *domain_parent;
struct regmap *mscm_cp_regmap;
int ret, cpuid;
domain_parent = irq_find_host(parent);
if (!domain_parent) {
pr_err("vf610_mscm_ir: interrupt-parent not found\n");
return -EINVAL;
}
mscm_ir_data = kzalloc(sizeof(*mscm_ir_data), GFP_KERNEL);
if (!mscm_ir_data)
return -ENOMEM;
mscm_ir_data->mscm_ir_base = of_io_request_and_map(node, 0, "mscm-ir");
if (IS_ERR(mscm_ir_data->mscm_ir_base)) {
pr_err("vf610_mscm_ir: unable to map mscm register\n");
ret = PTR_ERR(mscm_ir_data->mscm_ir_base);
goto out_free;
}
mscm_cp_regmap = syscon_regmap_lookup_by_phandle(node, "fsl,cpucfg");
if (IS_ERR(mscm_cp_regmap)) {
ret = PTR_ERR(mscm_cp_regmap);
pr_err("vf610_mscm_ir: regmap lookup for cpucfg failed\n");
goto out_unmap;
}
regmap_read(mscm_cp_regmap, MSCM_CPxNUM, &cpuid);
mscm_ir_data->cpu_mask = 0x1 << cpuid;
domain = irq_domain_add_hierarchy(domain_parent, 0,
MSCM_IRSPRC_NUM, node,
&mscm_irq_domain_ops, mscm_ir_data);
if (!domain) {
ret = -ENOMEM;
goto out_unmap;
}
if (of_device_is_compatible(irq_domain_get_of_node(domain->parent),
"arm,armv7m-nvic"))
mscm_ir_data->is_nvic = true;
cpu_pm_register_notifier(&mscm_ir_notifier_block);
return 0;
out_unmap:
iounmap(mscm_ir_data->mscm_ir_base);
out_free:
kfree(mscm_ir_data);
return ret;
}
IRQCHIP_DECLARE(vf610_mscm_ir, "fsl,vf610-mscm-ir", vf610_mscm_ir_of_init);
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