280 строки
6.4 KiB
C
280 строки
6.4 KiB
C
/*
|
|
* Copyright (C) 2015 Freescale Semiconductor, Inc.
|
|
*
|
|
* 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 <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/syscore_ops.h>
|
|
|
|
#define IMR_NUM 4
|
|
#define GPC_MAX_IRQS (IMR_NUM * 32)
|
|
|
|
#define GPC_IMR1_CORE0 0x30
|
|
#define GPC_IMR1_CORE1 0x40
|
|
|
|
struct gpcv2_irqchip_data {
|
|
struct raw_spinlock rlock;
|
|
void __iomem *gpc_base;
|
|
u32 wakeup_sources[IMR_NUM];
|
|
u32 saved_irq_mask[IMR_NUM];
|
|
u32 cpu2wakeup;
|
|
};
|
|
|
|
static struct gpcv2_irqchip_data *imx_gpcv2_instance;
|
|
|
|
/*
|
|
* Interface for the low level wakeup code.
|
|
*/
|
|
u32 imx_gpcv2_get_wakeup_source(u32 **sources)
|
|
{
|
|
if (!imx_gpcv2_instance)
|
|
return 0;
|
|
|
|
if (sources)
|
|
*sources = imx_gpcv2_instance->wakeup_sources;
|
|
|
|
return IMR_NUM;
|
|
}
|
|
|
|
static int gpcv2_wakeup_source_save(void)
|
|
{
|
|
struct gpcv2_irqchip_data *cd;
|
|
void __iomem *reg;
|
|
int i;
|
|
|
|
cd = imx_gpcv2_instance;
|
|
if (!cd)
|
|
return 0;
|
|
|
|
for (i = 0; i < IMR_NUM; i++) {
|
|
reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
|
|
cd->saved_irq_mask[i] = readl_relaxed(reg);
|
|
writel_relaxed(cd->wakeup_sources[i], reg);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gpcv2_wakeup_source_restore(void)
|
|
{
|
|
struct gpcv2_irqchip_data *cd;
|
|
void __iomem *reg;
|
|
int i;
|
|
|
|
cd = imx_gpcv2_instance;
|
|
if (!cd)
|
|
return;
|
|
|
|
for (i = 0; i < IMR_NUM; i++) {
|
|
reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
|
|
writel_relaxed(cd->saved_irq_mask[i], reg);
|
|
}
|
|
}
|
|
|
|
static struct syscore_ops imx_gpcv2_syscore_ops = {
|
|
.suspend = gpcv2_wakeup_source_save,
|
|
.resume = gpcv2_wakeup_source_restore,
|
|
};
|
|
|
|
static int imx_gpcv2_irq_set_wake(struct irq_data *d, unsigned int on)
|
|
{
|
|
struct gpcv2_irqchip_data *cd = d->chip_data;
|
|
unsigned int idx = d->hwirq / 32;
|
|
unsigned long flags;
|
|
void __iomem *reg;
|
|
u32 mask, val;
|
|
|
|
raw_spin_lock_irqsave(&cd->rlock, flags);
|
|
reg = cd->gpc_base + cd->cpu2wakeup + idx * 4;
|
|
mask = 1 << d->hwirq % 32;
|
|
val = cd->wakeup_sources[idx];
|
|
|
|
cd->wakeup_sources[idx] = on ? (val & ~mask) : (val | mask);
|
|
raw_spin_unlock_irqrestore(&cd->rlock, flags);
|
|
|
|
/*
|
|
* Do *not* call into the parent, as the GIC doesn't have any
|
|
* wake-up facility...
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void imx_gpcv2_irq_unmask(struct irq_data *d)
|
|
{
|
|
struct gpcv2_irqchip_data *cd = d->chip_data;
|
|
void __iomem *reg;
|
|
u32 val;
|
|
|
|
raw_spin_lock(&cd->rlock);
|
|
reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
|
|
val = readl_relaxed(reg);
|
|
val &= ~(1 << d->hwirq % 32);
|
|
writel_relaxed(val, reg);
|
|
raw_spin_unlock(&cd->rlock);
|
|
|
|
irq_chip_unmask_parent(d);
|
|
}
|
|
|
|
static void imx_gpcv2_irq_mask(struct irq_data *d)
|
|
{
|
|
struct gpcv2_irqchip_data *cd = d->chip_data;
|
|
void __iomem *reg;
|
|
u32 val;
|
|
|
|
raw_spin_lock(&cd->rlock);
|
|
reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
|
|
val = readl_relaxed(reg);
|
|
val |= 1 << (d->hwirq % 32);
|
|
writel_relaxed(val, reg);
|
|
raw_spin_unlock(&cd->rlock);
|
|
|
|
irq_chip_mask_parent(d);
|
|
}
|
|
|
|
static struct irq_chip gpcv2_irqchip_data_chip = {
|
|
.name = "GPCv2",
|
|
.irq_eoi = irq_chip_eoi_parent,
|
|
.irq_mask = imx_gpcv2_irq_mask,
|
|
.irq_unmask = imx_gpcv2_irq_unmask,
|
|
.irq_set_wake = imx_gpcv2_irq_set_wake,
|
|
.irq_retrigger = irq_chip_retrigger_hierarchy,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = irq_chip_set_affinity_parent,
|
|
#endif
|
|
};
|
|
|
|
static int imx_gpcv2_domain_translate(struct irq_domain *d,
|
|
struct irq_fwspec *fwspec,
|
|
unsigned long *hwirq,
|
|
unsigned int *type)
|
|
{
|
|
if (is_of_node(fwspec->fwnode)) {
|
|
if (fwspec->param_count != 3)
|
|
return -EINVAL;
|
|
|
|
/* No PPI should point to this domain */
|
|
if (fwspec->param[0] != 0)
|
|
return -EINVAL;
|
|
|
|
*hwirq = fwspec->param[1];
|
|
*type = fwspec->param[2];
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int imx_gpcv2_domain_alloc(struct irq_domain *domain,
|
|
unsigned int irq, unsigned int nr_irqs,
|
|
void *data)
|
|
{
|
|
struct irq_fwspec *fwspec = data;
|
|
struct irq_fwspec parent_fwspec;
|
|
irq_hw_number_t hwirq;
|
|
unsigned int type;
|
|
int err;
|
|
int i;
|
|
|
|
err = imx_gpcv2_domain_translate(domain, fwspec, &hwirq, &type);
|
|
if (err)
|
|
return err;
|
|
|
|
if (hwirq >= GPC_MAX_IRQS)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
|
|
&gpcv2_irqchip_data_chip, domain->host_data);
|
|
}
|
|
|
|
parent_fwspec = *fwspec;
|
|
parent_fwspec.fwnode = domain->parent->fwnode;
|
|
return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
|
|
&parent_fwspec);
|
|
}
|
|
|
|
static const struct irq_domain_ops gpcv2_irqchip_data_domain_ops = {
|
|
.translate = imx_gpcv2_domain_translate,
|
|
.alloc = imx_gpcv2_domain_alloc,
|
|
.free = irq_domain_free_irqs_common,
|
|
};
|
|
|
|
static int __init imx_gpcv2_irqchip_init(struct device_node *node,
|
|
struct device_node *parent)
|
|
{
|
|
struct irq_domain *parent_domain, *domain;
|
|
struct gpcv2_irqchip_data *cd;
|
|
int i;
|
|
|
|
if (!parent) {
|
|
pr_err("%pOF: no parent, giving up\n", node);
|
|
return -ENODEV;
|
|
}
|
|
|
|
parent_domain = irq_find_host(parent);
|
|
if (!parent_domain) {
|
|
pr_err("%pOF: unable to get parent domain\n", node);
|
|
return -ENXIO;
|
|
}
|
|
|
|
cd = kzalloc(sizeof(struct gpcv2_irqchip_data), GFP_KERNEL);
|
|
if (!cd) {
|
|
pr_err("kzalloc failed!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
raw_spin_lock_init(&cd->rlock);
|
|
|
|
cd->gpc_base = of_iomap(node, 0);
|
|
if (!cd->gpc_base) {
|
|
pr_err("fsl-gpcv2: unable to map gpc registers\n");
|
|
kfree(cd);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
|
|
node, &gpcv2_irqchip_data_domain_ops, cd);
|
|
if (!domain) {
|
|
iounmap(cd->gpc_base);
|
|
kfree(cd);
|
|
return -ENOMEM;
|
|
}
|
|
irq_set_default_host(domain);
|
|
|
|
/* Initially mask all interrupts */
|
|
for (i = 0; i < IMR_NUM; i++) {
|
|
writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE0 + i * 4);
|
|
writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE1 + i * 4);
|
|
cd->wakeup_sources[i] = ~0;
|
|
}
|
|
|
|
/* Let CORE0 as the default CPU to wake up by GPC */
|
|
cd->cpu2wakeup = GPC_IMR1_CORE0;
|
|
|
|
/*
|
|
* Due to hardware design failure, need to make sure GPR
|
|
* interrupt(#32) is unmasked during RUN mode to avoid entering
|
|
* DSM by mistake.
|
|
*/
|
|
writel_relaxed(~0x1, cd->gpc_base + cd->cpu2wakeup);
|
|
|
|
imx_gpcv2_instance = cd;
|
|
register_syscore_ops(&imx_gpcv2_syscore_ops);
|
|
|
|
/*
|
|
* Clear the OF_POPULATED flag set in of_irq_init so that
|
|
* later the GPC power domain driver will not be skipped.
|
|
*/
|
|
of_node_clear_flag(node, OF_POPULATED);
|
|
return 0;
|
|
}
|
|
|
|
IRQCHIP_DECLARE(imx_gpcv2, "fsl,imx7d-gpc", imx_gpcv2_irqchip_init);
|