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alistair23-linux/drivers/irqchip/irq-tegra.c
Jon Hunter a2a8fa5563 irqchip: Mask the non-type/sense bits when translating an IRQ 
The firmware parameter that contains the IRQ sense bits may also contain
other data. When return the IRQ type, bits outside of these sense bits
should be masked. If these bits are not masked and
irq_create_fwspec_mapping() is called to map an IRQ, then the comparison
of the type returned from irq_domain_translate() will never match
that returned by irq_get_trigger_type() (because this function masks the
none sense bits) and so we will always call irq_set_irq_type() to program
the type even if it was not really necessary.

Currently, the downside to this is unnecessarily re-programmming the type
but nevertheless this should be avoided.

The Tegra LIC and TI Crossbar irqchips all have client instances (from
reviewing the device-tree sources) where bits outside the IRQ sense bits
are set, but do not mask these bits. Therefore, ensure these bits are
masked for these irqchips.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-05-11 10:12:41 +01:00

369 lines
8.9 KiB
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/*
* Driver code for Tegra's Legacy Interrupt Controller
*
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Heavily based on the original arch/arm/mach-tegra/irq.c code:
* Copyright (C) 2011 Google, Inc.
*
* Author:
* Colin Cross <ccross@android.com>
*
* Copyright (C) 2010,2013, NVIDIA Corporation
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define ICTLR_CPU_IEP_VFIQ 0x08
#define ICTLR_CPU_IEP_FIR 0x14
#define ICTLR_CPU_IEP_FIR_SET 0x18
#define ICTLR_CPU_IEP_FIR_CLR 0x1c
#define ICTLR_CPU_IER 0x20
#define ICTLR_CPU_IER_SET 0x24
#define ICTLR_CPU_IER_CLR 0x28
#define ICTLR_CPU_IEP_CLASS 0x2C
#define ICTLR_COP_IER 0x30
#define ICTLR_COP_IER_SET 0x34
#define ICTLR_COP_IER_CLR 0x38
#define ICTLR_COP_IEP_CLASS 0x3c
#define TEGRA_MAX_NUM_ICTLRS 6
static unsigned int num_ictlrs;
struct tegra_ictlr_soc {
unsigned int num_ictlrs;
};
static const struct tegra_ictlr_soc tegra20_ictlr_soc = {
.num_ictlrs = 4,
};
static const struct tegra_ictlr_soc tegra30_ictlr_soc = {
.num_ictlrs = 5,
};
static const struct tegra_ictlr_soc tegra210_ictlr_soc = {
.num_ictlrs = 6,
};
static const struct of_device_id ictlr_matches[] = {
{ .compatible = "nvidia,tegra210-ictlr", .data = &tegra210_ictlr_soc },
{ .compatible = "nvidia,tegra30-ictlr", .data = &tegra30_ictlr_soc },
{ .compatible = "nvidia,tegra20-ictlr", .data = &tegra20_ictlr_soc },
{ }
};
struct tegra_ictlr_info {
void __iomem *base[TEGRA_MAX_NUM_ICTLRS];
#ifdef CONFIG_PM_SLEEP
u32 cop_ier[TEGRA_MAX_NUM_ICTLRS];
u32 cop_iep[TEGRA_MAX_NUM_ICTLRS];
u32 cpu_ier[TEGRA_MAX_NUM_ICTLRS];
u32 cpu_iep[TEGRA_MAX_NUM_ICTLRS];
u32 ictlr_wake_mask[TEGRA_MAX_NUM_ICTLRS];
#endif
};
static struct tegra_ictlr_info *lic;
static inline void tegra_ictlr_write_mask(struct irq_data *d, unsigned long reg)
{
void __iomem *base = d->chip_data;
u32 mask;
mask = BIT(d->hwirq % 32);
writel_relaxed(mask, base + reg);
}
static void tegra_mask(struct irq_data *d)
{
tegra_ictlr_write_mask(d, ICTLR_CPU_IER_CLR);
irq_chip_mask_parent(d);
}
static void tegra_unmask(struct irq_data *d)
{
tegra_ictlr_write_mask(d, ICTLR_CPU_IER_SET);
irq_chip_unmask_parent(d);
}
static void tegra_eoi(struct irq_data *d)
{
tegra_ictlr_write_mask(d, ICTLR_CPU_IEP_FIR_CLR);
irq_chip_eoi_parent(d);
}
static int tegra_retrigger(struct irq_data *d)
{
tegra_ictlr_write_mask(d, ICTLR_CPU_IEP_FIR_SET);
return irq_chip_retrigger_hierarchy(d);
}
#ifdef CONFIG_PM_SLEEP
static int tegra_set_wake(struct irq_data *d, unsigned int enable)
{
u32 irq = d->hwirq;
u32 index, mask;
index = (irq / 32);
mask = BIT(irq % 32);
if (enable)
lic->ictlr_wake_mask[index] |= mask;
else
lic->ictlr_wake_mask[index] &= ~mask;
/*
* Do *not* call into the parent, as the GIC doesn't have any
* wake-up facility...
*/
return 0;
}
static int tegra_ictlr_suspend(void)
{
unsigned long flags;
unsigned int i;
local_irq_save(flags);
for (i = 0; i < num_ictlrs; i++) {
void __iomem *ictlr = lic->base[i];
/* Save interrupt state */
lic->cpu_ier[i] = readl_relaxed(ictlr + ICTLR_CPU_IER);
lic->cpu_iep[i] = readl_relaxed(ictlr + ICTLR_CPU_IEP_CLASS);
lic->cop_ier[i] = readl_relaxed(ictlr + ICTLR_COP_IER);
lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS);
/* Disable COP interrupts */
writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
/* Disable CPU interrupts */
writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR);
/* Enable the wakeup sources of ictlr */
writel_relaxed(lic->ictlr_wake_mask[i], ictlr + ICTLR_CPU_IER_SET);
}
local_irq_restore(flags);
return 0;
}
static void tegra_ictlr_resume(void)
{
unsigned long flags;
unsigned int i;
local_irq_save(flags);
for (i = 0; i < num_ictlrs; i++) {
void __iomem *ictlr = lic->base[i];
writel_relaxed(lic->cpu_iep[i],
ictlr + ICTLR_CPU_IEP_CLASS);
writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR);
writel_relaxed(lic->cpu_ier[i],
ictlr + ICTLR_CPU_IER_SET);
writel_relaxed(lic->cop_iep[i],
ictlr + ICTLR_COP_IEP_CLASS);
writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR);
writel_relaxed(lic->cop_ier[i],
ictlr + ICTLR_COP_IER_SET);
}
local_irq_restore(flags);
}
static struct syscore_ops tegra_ictlr_syscore_ops = {
.suspend = tegra_ictlr_suspend,
.resume = tegra_ictlr_resume,
};
static void tegra_ictlr_syscore_init(void)
{
register_syscore_ops(&tegra_ictlr_syscore_ops);
}
#else
#define tegra_set_wake NULL
static inline void tegra_ictlr_syscore_init(void) {}
#endif
static struct irq_chip tegra_ictlr_chip = {
.name = "LIC",
.irq_eoi = tegra_eoi,
.irq_mask = tegra_mask,
.irq_unmask = tegra_unmask,
.irq_retrigger = tegra_retrigger,
.irq_set_wake = tegra_set_wake,
.irq_set_type = irq_chip_set_type_parent,
.flags = IRQCHIP_MASK_ON_SUSPEND,
#ifdef CONFIG_SMP
.irq_set_affinity = irq_chip_set_affinity_parent,
#endif
};
static int tegra_ictlr_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] & IRQ_TYPE_SENSE_MASK;
return 0;
}
return -EINVAL;
}
static int tegra_ictlr_domain_alloc(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs, void *data)
{
struct irq_fwspec *fwspec = data;
struct irq_fwspec parent_fwspec;
struct tegra_ictlr_info *info = domain->host_data;
irq_hw_number_t hwirq;
unsigned int i;
if (fwspec->param_count != 3)
return -EINVAL; /* Not GIC compliant */
if (fwspec->param[0] != GIC_SPI)
return -EINVAL; /* No PPI should point to this domain */
hwirq = fwspec->param[1];
if (hwirq >= (num_ictlrs * 32))
return -EINVAL;
for (i = 0; i < nr_irqs; i++) {
int ictlr = (hwirq + i) / 32;
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
&tegra_ictlr_chip,
info->base[ictlr]);
}
parent_fwspec = *fwspec;
parent_fwspec.fwnode = domain->parent->fwnode;
return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
&parent_fwspec);
}
static const struct irq_domain_ops tegra_ictlr_domain_ops = {
.translate = tegra_ictlr_domain_translate,
.alloc = tegra_ictlr_domain_alloc,
.free = irq_domain_free_irqs_common,
};
static int __init tegra_ictlr_init(struct device_node *node,
struct device_node *parent)
{
struct irq_domain *parent_domain, *domain;
const struct of_device_id *match;
const struct tegra_ictlr_soc *soc;
unsigned int i;
int err;
if (!parent) {
pr_err("%s: no parent, giving up\n", node->full_name);
return -ENODEV;
}
parent_domain = irq_find_host(parent);
if (!parent_domain) {
pr_err("%s: unable to obtain parent domain\n", node->full_name);
return -ENXIO;
}
match = of_match_node(ictlr_matches, node);
if (!match) /* Should never happen... */
return -ENODEV;
soc = match->data;
lic = kzalloc(sizeof(*lic), GFP_KERNEL);
if (!lic)
return -ENOMEM;
for (i = 0; i < TEGRA_MAX_NUM_ICTLRS; i++) {
void __iomem *base;
base = of_iomap(node, i);
if (!base)
break;
lic->base[i] = base;
/* Disable all interrupts */
writel_relaxed(~0UL, base + ICTLR_CPU_IER_CLR);
/* All interrupts target IRQ */
writel_relaxed(0, base + ICTLR_CPU_IEP_CLASS);
num_ictlrs++;
}
if (!num_ictlrs) {
pr_err("%s: no valid regions, giving up\n", node->full_name);
err = -ENOMEM;
goto out_free;
}
WARN(num_ictlrs != soc->num_ictlrs,
"%s: Found %u interrupt controllers in DT; expected %u.\n",
node->full_name, num_ictlrs, soc->num_ictlrs);
domain = irq_domain_add_hierarchy(parent_domain, 0, num_ictlrs * 32,
node, &tegra_ictlr_domain_ops,
lic);
if (!domain) {
pr_err("%s: failed to allocated domain\n", node->full_name);
err = -ENOMEM;
goto out_unmap;
}
tegra_ictlr_syscore_init();
pr_info("%s: %d interrupts forwarded to %s\n",
node->full_name, num_ictlrs * 32, parent->full_name);
return 0;
out_unmap:
for (i = 0; i < num_ictlrs; i++)
iounmap(lic->base[i]);
out_free:
kfree(lic);
return err;
}
IRQCHIP_DECLARE(tegra20_ictlr, "nvidia,tegra20-ictlr", tegra_ictlr_init);
IRQCHIP_DECLARE(tegra30_ictlr, "nvidia,tegra30-ictlr", tegra_ictlr_init);
IRQCHIP_DECLARE(tegra210_ictlr, "nvidia,tegra210-ictlr", tegra_ictlr_init);
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