2014-06-30 19:01:31 +04:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved.
|
|
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/cpu.h>
|
2014-08-26 19:03:35 +04:00
|
|
|
#include <linux/cpu_pm.h>
|
2014-06-30 19:01:31 +04:00
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/of_address.h>
|
|
|
|
#include <linux/of_irq.h>
|
|
|
|
#include <linux/percpu.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
|
|
|
|
#include <linux/irqchip/arm-gic-v3.h>
|
|
|
|
|
|
|
|
#include <asm/cputype.h>
|
|
|
|
#include <asm/exception.h>
|
|
|
|
#include <asm/smp_plat.h>
|
|
|
|
|
|
|
|
#include "irq-gic-common.h"
|
|
|
|
#include "irqchip.h"
|
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
struct redist_region {
|
|
|
|
void __iomem *redist_base;
|
|
|
|
phys_addr_t phys_base;
|
|
|
|
};
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
struct gic_chip_data {
|
|
|
|
void __iomem *dist_base;
|
2014-11-24 17:35:10 +03:00
|
|
|
struct redist_region *redist_regions;
|
|
|
|
struct rdists rdists;
|
2014-06-30 19:01:31 +04:00
|
|
|
struct irq_domain *domain;
|
|
|
|
u64 redist_stride;
|
2014-11-24 17:35:10 +03:00
|
|
|
u32 nr_redist_regions;
|
2014-06-30 19:01:31 +04:00
|
|
|
unsigned int irq_nr;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct gic_chip_data gic_data __read_mostly;
|
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
#define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist))
|
|
|
|
#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
|
2014-06-30 19:01:31 +04:00
|
|
|
#define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K)
|
|
|
|
|
|
|
|
/* Our default, arbitrary priority value. Linux only uses one anyway. */
|
|
|
|
#define DEFAULT_PMR_VALUE 0xf0
|
|
|
|
|
|
|
|
static inline unsigned int gic_irq(struct irq_data *d)
|
|
|
|
{
|
|
|
|
return d->hwirq;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int gic_irq_in_rdist(struct irq_data *d)
|
|
|
|
{
|
|
|
|
return gic_irq(d) < 32;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void __iomem *gic_dist_base(struct irq_data *d)
|
|
|
|
{
|
|
|
|
if (gic_irq_in_rdist(d)) /* SGI+PPI -> SGI_base for this CPU */
|
|
|
|
return gic_data_rdist_sgi_base();
|
|
|
|
|
|
|
|
if (d->hwirq <= 1023) /* SPI -> dist_base */
|
|
|
|
return gic_data.dist_base;
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_do_wait_for_rwp(void __iomem *base)
|
|
|
|
{
|
|
|
|
u32 count = 1000000; /* 1s! */
|
|
|
|
|
|
|
|
while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
|
|
|
|
count--;
|
|
|
|
if (!count) {
|
|
|
|
pr_err_ratelimited("RWP timeout, gone fishing\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
cpu_relax();
|
|
|
|
udelay(1);
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Wait for completion of a distributor change */
|
|
|
|
static void gic_dist_wait_for_rwp(void)
|
|
|
|
{
|
|
|
|
gic_do_wait_for_rwp(gic_data.dist_base);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Wait for completion of a redistributor change */
|
|
|
|
static void gic_redist_wait_for_rwp(void)
|
|
|
|
{
|
|
|
|
gic_do_wait_for_rwp(gic_data_rdist_rd_base());
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Low level accessors */
|
2014-07-30 23:23:14 +04:00
|
|
|
static u64 __maybe_unused gic_read_iar(void)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
|
|
|
u64 irqstat;
|
|
|
|
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("mrs_s %0, " __stringify(ICC_IAR1_EL1) : "=r" (irqstat));
|
2014-06-30 19:01:31 +04:00
|
|
|
return irqstat;
|
|
|
|
}
|
|
|
|
|
2014-07-30 23:23:14 +04:00
|
|
|
static void __maybe_unused gic_write_pmr(u64 val)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("msr_s " __stringify(ICC_PMR_EL1) ", %0" : : "r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
2014-07-30 23:23:14 +04:00
|
|
|
static void __maybe_unused gic_write_ctlr(u64 val)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("msr_s " __stringify(ICC_CTLR_EL1) ", %0" : : "r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
isb();
|
|
|
|
}
|
|
|
|
|
2014-07-30 23:23:14 +04:00
|
|
|
static void __maybe_unused gic_write_grpen1(u64 val)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("msr_s " __stringify(ICC_GRPEN1_EL1) ", %0" : : "r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
isb();
|
|
|
|
}
|
|
|
|
|
2014-07-30 23:23:14 +04:00
|
|
|
static void __maybe_unused gic_write_sgi1r(u64 val)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("msr_s " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_enable_sre(void)
|
|
|
|
{
|
|
|
|
u64 val;
|
|
|
|
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
val |= ICC_SRE_EL1_SRE;
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("msr_s " __stringify(ICC_SRE_EL1) ", %0" : : "r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
isb();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Need to check that the SRE bit has actually been set. If
|
|
|
|
* not, it means that SRE is disabled at EL2. We're going to
|
|
|
|
* die painfully, and there is nothing we can do about it.
|
|
|
|
*
|
|
|
|
* Kindly inform the luser.
|
|
|
|
*/
|
2014-07-24 17:14:42 +04:00
|
|
|
asm volatile("mrs_s %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
|
2014-06-30 19:01:31 +04:00
|
|
|
if (!(val & ICC_SRE_EL1_SRE))
|
|
|
|
pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
|
|
|
|
}
|
|
|
|
|
2014-08-26 19:03:34 +04:00
|
|
|
static void gic_enable_redist(bool enable)
|
2014-06-30 19:01:31 +04:00
|
|
|
{
|
|
|
|
void __iomem *rbase;
|
|
|
|
u32 count = 1000000; /* 1s! */
|
|
|
|
u32 val;
|
|
|
|
|
|
|
|
rbase = gic_data_rdist_rd_base();
|
|
|
|
|
|
|
|
val = readl_relaxed(rbase + GICR_WAKER);
|
2014-08-26 19:03:34 +04:00
|
|
|
if (enable)
|
|
|
|
/* Wake up this CPU redistributor */
|
|
|
|
val &= ~GICR_WAKER_ProcessorSleep;
|
|
|
|
else
|
|
|
|
val |= GICR_WAKER_ProcessorSleep;
|
2014-06-30 19:01:31 +04:00
|
|
|
writel_relaxed(val, rbase + GICR_WAKER);
|
|
|
|
|
2014-08-26 19:03:34 +04:00
|
|
|
if (!enable) { /* Check that GICR_WAKER is writeable */
|
|
|
|
val = readl_relaxed(rbase + GICR_WAKER);
|
|
|
|
if (!(val & GICR_WAKER_ProcessorSleep))
|
|
|
|
return; /* No PM support in this redistributor */
|
|
|
|
}
|
|
|
|
|
|
|
|
while (count--) {
|
|
|
|
val = readl_relaxed(rbase + GICR_WAKER);
|
|
|
|
if (enable ^ (val & GICR_WAKER_ChildrenAsleep))
|
|
|
|
break;
|
2014-06-30 19:01:31 +04:00
|
|
|
cpu_relax();
|
|
|
|
udelay(1);
|
|
|
|
};
|
2014-08-26 19:03:34 +04:00
|
|
|
if (!count)
|
|
|
|
pr_err_ratelimited("redistributor failed to %s...\n",
|
|
|
|
enable ? "wakeup" : "sleep");
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Routines to disable, enable, EOI and route interrupts
|
|
|
|
*/
|
|
|
|
static void gic_poke_irq(struct irq_data *d, u32 offset)
|
|
|
|
{
|
|
|
|
u32 mask = 1 << (gic_irq(d) % 32);
|
|
|
|
void (*rwp_wait)(void);
|
|
|
|
void __iomem *base;
|
|
|
|
|
|
|
|
if (gic_irq_in_rdist(d)) {
|
|
|
|
base = gic_data_rdist_sgi_base();
|
|
|
|
rwp_wait = gic_redist_wait_for_rwp;
|
|
|
|
} else {
|
|
|
|
base = gic_data.dist_base;
|
|
|
|
rwp_wait = gic_dist_wait_for_rwp;
|
|
|
|
}
|
|
|
|
|
|
|
|
writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4);
|
|
|
|
rwp_wait();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_mask_irq(struct irq_data *d)
|
|
|
|
{
|
|
|
|
gic_poke_irq(d, GICD_ICENABLER);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_unmask_irq(struct irq_data *d)
|
|
|
|
{
|
|
|
|
gic_poke_irq(d, GICD_ISENABLER);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_eoi_irq(struct irq_data *d)
|
|
|
|
{
|
|
|
|
gic_write_eoir(gic_irq(d));
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gic_set_type(struct irq_data *d, unsigned int type)
|
|
|
|
{
|
|
|
|
unsigned int irq = gic_irq(d);
|
|
|
|
void (*rwp_wait)(void);
|
|
|
|
void __iomem *base;
|
|
|
|
|
|
|
|
/* Interrupt configuration for SGIs can't be changed */
|
|
|
|
if (irq < 16)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2015-01-20 19:52:59 +03:00
|
|
|
/* SPIs have restrictions on the supported types */
|
|
|
|
if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
|
|
|
|
type != IRQ_TYPE_EDGE_RISING)
|
2014-06-30 19:01:31 +04:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (gic_irq_in_rdist(d)) {
|
|
|
|
base = gic_data_rdist_sgi_base();
|
|
|
|
rwp_wait = gic_redist_wait_for_rwp;
|
|
|
|
} else {
|
|
|
|
base = gic_data.dist_base;
|
|
|
|
rwp_wait = gic_dist_wait_for_rwp;
|
|
|
|
}
|
|
|
|
|
2015-01-20 19:52:59 +03:00
|
|
|
return gic_configure_irq(irq, type, base, rwp_wait);
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static u64 gic_mpidr_to_affinity(u64 mpidr)
|
|
|
|
{
|
|
|
|
u64 aff;
|
|
|
|
|
|
|
|
aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 0));
|
|
|
|
|
|
|
|
return aff;
|
|
|
|
}
|
|
|
|
|
|
|
|
static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
u64 irqnr;
|
|
|
|
|
|
|
|
do {
|
|
|
|
irqnr = gic_read_iar();
|
|
|
|
|
2014-11-24 17:35:18 +03:00
|
|
|
if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
|
2014-08-26 14:03:33 +04:00
|
|
|
int err;
|
|
|
|
err = handle_domain_irq(gic_data.domain, irqnr, regs);
|
|
|
|
if (err) {
|
2014-11-24 17:35:18 +03:00
|
|
|
WARN_ONCE(true, "Unexpected interrupt received!\n");
|
2014-08-26 14:03:33 +04:00
|
|
|
gic_write_eoir(irqnr);
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
2014-08-26 14:03:33 +04:00
|
|
|
continue;
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
if (irqnr < 16) {
|
|
|
|
gic_write_eoir(irqnr);
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
handle_IPI(irqnr, regs);
|
|
|
|
#else
|
|
|
|
WARN_ONCE(true, "Unexpected SGI received!\n");
|
|
|
|
#endif
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
} while (irqnr != ICC_IAR1_EL1_SPURIOUS);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __init gic_dist_init(void)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
u64 affinity;
|
|
|
|
void __iomem *base = gic_data.dist_base;
|
|
|
|
|
|
|
|
/* Disable the distributor */
|
|
|
|
writel_relaxed(0, base + GICD_CTLR);
|
|
|
|
gic_dist_wait_for_rwp();
|
|
|
|
|
|
|
|
gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
|
|
|
|
|
|
|
|
/* Enable distributor with ARE, Group1 */
|
|
|
|
writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
|
|
|
|
base + GICD_CTLR);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set all global interrupts to the boot CPU only. ARE must be
|
|
|
|
* enabled.
|
|
|
|
*/
|
|
|
|
affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
|
|
|
|
for (i = 32; i < gic_data.irq_nr; i++)
|
|
|
|
writeq_relaxed(affinity, base + GICD_IROUTER + i * 8);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gic_populate_rdist(void)
|
|
|
|
{
|
|
|
|
u64 mpidr = cpu_logical_map(smp_processor_id());
|
|
|
|
u64 typer;
|
|
|
|
u32 aff;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Convert affinity to a 32bit value that can be matched to
|
|
|
|
* GICR_TYPER bits [63:32].
|
|
|
|
*/
|
|
|
|
aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
|
|
|
|
MPIDR_AFFINITY_LEVEL(mpidr, 0));
|
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
for (i = 0; i < gic_data.nr_redist_regions; i++) {
|
|
|
|
void __iomem *ptr = gic_data.redist_regions[i].redist_base;
|
2014-06-30 19:01:31 +04:00
|
|
|
u32 reg;
|
|
|
|
|
|
|
|
reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
|
|
|
|
if (reg != GIC_PIDR2_ARCH_GICv3 &&
|
|
|
|
reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
|
|
|
|
pr_warn("No redistributor present @%p\n", ptr);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
do {
|
|
|
|
typer = readq_relaxed(ptr + GICR_TYPER);
|
|
|
|
if ((typer >> 32) == aff) {
|
2014-11-24 17:35:10 +03:00
|
|
|
u64 offset = ptr - gic_data.redist_regions[i].redist_base;
|
2014-06-30 19:01:31 +04:00
|
|
|
gic_data_rdist_rd_base() = ptr;
|
2014-11-24 17:35:10 +03:00
|
|
|
gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
|
|
|
|
pr_info("CPU%d: found redistributor %llx region %d:%pa\n",
|
2014-06-30 19:01:31 +04:00
|
|
|
smp_processor_id(),
|
2014-11-24 17:35:10 +03:00
|
|
|
(unsigned long long)mpidr,
|
|
|
|
i, &gic_data_rdist()->phys_base);
|
2014-06-30 19:01:31 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (gic_data.redist_stride) {
|
|
|
|
ptr += gic_data.redist_stride;
|
|
|
|
} else {
|
|
|
|
ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
|
|
|
|
if (typer & GICR_TYPER_VLPIS)
|
|
|
|
ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
|
|
|
|
}
|
|
|
|
} while (!(typer & GICR_TYPER_LAST));
|
|
|
|
}
|
|
|
|
|
|
|
|
/* We couldn't even deal with ourselves... */
|
|
|
|
WARN(true, "CPU%d: mpidr %llx has no re-distributor!\n",
|
|
|
|
smp_processor_id(), (unsigned long long)mpidr);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
2014-08-26 19:03:35 +04:00
|
|
|
static void gic_cpu_sys_reg_init(void)
|
|
|
|
{
|
|
|
|
/* Enable system registers */
|
|
|
|
gic_enable_sre();
|
|
|
|
|
|
|
|
/* Set priority mask register */
|
|
|
|
gic_write_pmr(DEFAULT_PMR_VALUE);
|
|
|
|
|
|
|
|
/* EOI deactivates interrupt too (mode 0) */
|
|
|
|
gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
|
|
|
|
|
|
|
|
/* ... and let's hit the road... */
|
|
|
|
gic_write_grpen1(1);
|
|
|
|
}
|
|
|
|
|
2014-11-24 17:35:18 +03:00
|
|
|
static int gic_dist_supports_lpis(void)
|
|
|
|
{
|
|
|
|
return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
|
|
|
|
}
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static void gic_cpu_init(void)
|
|
|
|
{
|
|
|
|
void __iomem *rbase;
|
|
|
|
|
|
|
|
/* Register ourselves with the rest of the world */
|
|
|
|
if (gic_populate_rdist())
|
|
|
|
return;
|
|
|
|
|
2014-08-26 19:03:34 +04:00
|
|
|
gic_enable_redist(true);
|
2014-06-30 19:01:31 +04:00
|
|
|
|
|
|
|
rbase = gic_data_rdist_sgi_base();
|
|
|
|
|
|
|
|
gic_cpu_config(rbase, gic_redist_wait_for_rwp);
|
|
|
|
|
2014-11-24 17:35:18 +03:00
|
|
|
/* Give LPIs a spin */
|
|
|
|
if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
|
|
|
|
its_cpu_init();
|
|
|
|
|
2014-08-26 19:03:35 +04:00
|
|
|
/* initialise system registers */
|
|
|
|
gic_cpu_sys_reg_init();
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
2014-07-27 20:57:04 +04:00
|
|
|
static int gic_peek_irq(struct irq_data *d, u32 offset)
|
|
|
|
{
|
|
|
|
u32 mask = 1 << (gic_irq(d) % 32);
|
|
|
|
void __iomem *base;
|
|
|
|
|
|
|
|
if (gic_irq_in_rdist(d))
|
|
|
|
base = gic_data_rdist_sgi_base();
|
|
|
|
else
|
|
|
|
base = gic_data.dist_base;
|
|
|
|
|
|
|
|
return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
|
|
|
|
}
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static int gic_secondary_init(struct notifier_block *nfb,
|
|
|
|
unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
|
|
|
|
gic_cpu_init();
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Notifier for enabling the GIC CPU interface. Set an arbitrarily high
|
|
|
|
* priority because the GIC needs to be up before the ARM generic timers.
|
|
|
|
*/
|
|
|
|
static struct notifier_block gic_cpu_notifier = {
|
|
|
|
.notifier_call = gic_secondary_init,
|
|
|
|
.priority = 100,
|
|
|
|
};
|
|
|
|
|
|
|
|
static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
|
|
|
|
u64 cluster_id)
|
|
|
|
{
|
|
|
|
int cpu = *base_cpu;
|
|
|
|
u64 mpidr = cpu_logical_map(cpu);
|
|
|
|
u16 tlist = 0;
|
|
|
|
|
|
|
|
while (cpu < nr_cpu_ids) {
|
|
|
|
/*
|
|
|
|
* If we ever get a cluster of more than 16 CPUs, just
|
|
|
|
* scream and skip that CPU.
|
|
|
|
*/
|
|
|
|
if (WARN_ON((mpidr & 0xff) >= 16))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
tlist |= 1 << (mpidr & 0xf);
|
|
|
|
|
|
|
|
cpu = cpumask_next(cpu, mask);
|
|
|
|
if (cpu == nr_cpu_ids)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
mpidr = cpu_logical_map(cpu);
|
|
|
|
|
|
|
|
if (cluster_id != (mpidr & ~0xffUL)) {
|
|
|
|
cpu--;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
*base_cpu = cpu;
|
|
|
|
return tlist;
|
|
|
|
}
|
|
|
|
|
2014-11-12 16:46:06 +03:00
|
|
|
#define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
|
|
|
|
(MPIDR_AFFINITY_LEVEL(cluster_id, level) \
|
|
|
|
<< ICC_SGI1R_AFFINITY_## level ##_SHIFT)
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
|
|
|
|
{
|
|
|
|
u64 val;
|
|
|
|
|
2014-11-12 16:46:06 +03:00
|
|
|
val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) |
|
|
|
|
MPIDR_TO_SGI_AFFINITY(cluster_id, 2) |
|
|
|
|
irq << ICC_SGI1R_SGI_ID_SHIFT |
|
|
|
|
MPIDR_TO_SGI_AFFINITY(cluster_id, 1) |
|
|
|
|
tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
|
2014-06-30 19:01:31 +04:00
|
|
|
|
|
|
|
pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
|
|
|
|
gic_write_sgi1r(val);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
|
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
if (WARN_ON(irq >= 16))
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ensure that stores to Normal memory are visible to the
|
|
|
|
* other CPUs before issuing the IPI.
|
|
|
|
*/
|
|
|
|
smp_wmb();
|
|
|
|
|
|
|
|
for_each_cpu_mask(cpu, *mask) {
|
|
|
|
u64 cluster_id = cpu_logical_map(cpu) & ~0xffUL;
|
|
|
|
u16 tlist;
|
|
|
|
|
|
|
|
tlist = gic_compute_target_list(&cpu, mask, cluster_id);
|
|
|
|
gic_send_sgi(cluster_id, tlist, irq);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Force the above writes to ICC_SGI1R_EL1 to be executed */
|
|
|
|
isb();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_smp_init(void)
|
|
|
|
{
|
|
|
|
set_smp_cross_call(gic_raise_softirq);
|
|
|
|
register_cpu_notifier(&gic_cpu_notifier);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
|
|
|
|
bool force)
|
|
|
|
{
|
|
|
|
unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
|
|
|
|
void __iomem *reg;
|
|
|
|
int enabled;
|
|
|
|
u64 val;
|
|
|
|
|
|
|
|
if (gic_irq_in_rdist(d))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/* If interrupt was enabled, disable it first */
|
|
|
|
enabled = gic_peek_irq(d, GICD_ISENABLER);
|
|
|
|
if (enabled)
|
|
|
|
gic_mask_irq(d);
|
|
|
|
|
|
|
|
reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8);
|
|
|
|
val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
|
|
|
|
|
|
|
|
writeq_relaxed(val, reg);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the interrupt was enabled, enabled it again. Otherwise,
|
|
|
|
* just wait for the distributor to have digested our changes.
|
|
|
|
*/
|
|
|
|
if (enabled)
|
|
|
|
gic_unmask_irq(d);
|
|
|
|
else
|
|
|
|
gic_dist_wait_for_rwp();
|
|
|
|
|
|
|
|
return IRQ_SET_MASK_OK;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define gic_set_affinity NULL
|
|
|
|
#define gic_smp_init() do { } while(0)
|
|
|
|
#endif
|
|
|
|
|
2014-08-26 19:03:35 +04:00
|
|
|
#ifdef CONFIG_CPU_PM
|
|
|
|
static int gic_cpu_pm_notifier(struct notifier_block *self,
|
|
|
|
unsigned long cmd, void *v)
|
|
|
|
{
|
|
|
|
if (cmd == CPU_PM_EXIT) {
|
|
|
|
gic_enable_redist(true);
|
|
|
|
gic_cpu_sys_reg_init();
|
|
|
|
} else if (cmd == CPU_PM_ENTER) {
|
|
|
|
gic_write_grpen1(0);
|
|
|
|
gic_enable_redist(false);
|
|
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block gic_cpu_pm_notifier_block = {
|
|
|
|
.notifier_call = gic_cpu_pm_notifier,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void gic_cpu_pm_init(void)
|
|
|
|
{
|
|
|
|
cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
|
|
|
|
}
|
|
|
|
|
|
|
|
#else
|
|
|
|
static inline void gic_cpu_pm_init(void) { }
|
|
|
|
#endif /* CONFIG_CPU_PM */
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static struct irq_chip gic_chip = {
|
|
|
|
.name = "GICv3",
|
|
|
|
.irq_mask = gic_mask_irq,
|
|
|
|
.irq_unmask = gic_unmask_irq,
|
|
|
|
.irq_eoi = gic_eoi_irq,
|
|
|
|
.irq_set_type = gic_set_type,
|
|
|
|
.irq_set_affinity = gic_set_affinity,
|
|
|
|
};
|
|
|
|
|
2014-11-24 17:35:18 +03:00
|
|
|
#define GIC_ID_NR (1U << gic_data.rdists.id_bits)
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
|
|
|
|
irq_hw_number_t hw)
|
|
|
|
{
|
|
|
|
/* SGIs are private to the core kernel */
|
|
|
|
if (hw < 16)
|
|
|
|
return -EPERM;
|
2014-11-24 17:35:18 +03:00
|
|
|
/* Nothing here */
|
|
|
|
if (hw >= gic_data.irq_nr && hw < 8192)
|
|
|
|
return -EPERM;
|
|
|
|
/* Off limits */
|
|
|
|
if (hw >= GIC_ID_NR)
|
|
|
|
return -EPERM;
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
/* PPIs */
|
|
|
|
if (hw < 32) {
|
|
|
|
irq_set_percpu_devid(irq);
|
2014-11-24 17:35:09 +03:00
|
|
|
irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
|
|
|
|
handle_percpu_devid_irq, NULL, NULL);
|
2014-06-30 19:01:31 +04:00
|
|
|
set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
|
|
|
|
}
|
|
|
|
/* SPIs */
|
|
|
|
if (hw >= 32 && hw < gic_data.irq_nr) {
|
2014-11-24 17:35:09 +03:00
|
|
|
irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
|
|
|
|
handle_fasteoi_irq, NULL, NULL);
|
2014-06-30 19:01:31 +04:00
|
|
|
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
|
|
|
|
}
|
2014-11-24 17:35:18 +03:00
|
|
|
/* LPIs */
|
|
|
|
if (hw >= 8192 && hw < GIC_ID_NR) {
|
|
|
|
if (!gic_dist_supports_lpis())
|
|
|
|
return -EPERM;
|
|
|
|
irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
|
|
|
|
handle_fasteoi_irq, NULL, NULL);
|
|
|
|
set_irq_flags(irq, IRQF_VALID);
|
|
|
|
}
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int gic_irq_domain_xlate(struct irq_domain *d,
|
|
|
|
struct device_node *controller,
|
|
|
|
const u32 *intspec, unsigned int intsize,
|
|
|
|
unsigned long *out_hwirq, unsigned int *out_type)
|
|
|
|
{
|
|
|
|
if (d->of_node != controller)
|
|
|
|
return -EINVAL;
|
|
|
|
if (intsize < 3)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
switch(intspec[0]) {
|
|
|
|
case 0: /* SPI */
|
|
|
|
*out_hwirq = intspec[1] + 32;
|
|
|
|
break;
|
|
|
|
case 1: /* PPI */
|
|
|
|
*out_hwirq = intspec[1] + 16;
|
|
|
|
break;
|
2014-11-24 17:35:18 +03:00
|
|
|
case GIC_IRQ_TYPE_LPI: /* LPI */
|
|
|
|
*out_hwirq = intspec[1];
|
|
|
|
break;
|
2014-06-30 19:01:31 +04:00
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-11-24 17:35:09 +03:00
|
|
|
static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
|
|
unsigned int nr_irqs, void *arg)
|
|
|
|
{
|
|
|
|
int i, ret;
|
|
|
|
irq_hw_number_t hwirq;
|
|
|
|
unsigned int type = IRQ_TYPE_NONE;
|
|
|
|
struct of_phandle_args *irq_data = arg;
|
|
|
|
|
|
|
|
ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args,
|
|
|
|
irq_data->args_count, &hwirq, &type);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
for (i = 0; i < nr_irqs; i++)
|
|
|
|
gic_irq_domain_map(domain, virq + i, hwirq + i);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
|
|
|
|
unsigned int nr_irqs)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
|
|
struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
|
|
|
|
irq_set_handler(virq + i, NULL);
|
|
|
|
irq_domain_reset_irq_data(d);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
static const struct irq_domain_ops gic_irq_domain_ops = {
|
|
|
|
.xlate = gic_irq_domain_xlate,
|
2014-11-24 17:35:09 +03:00
|
|
|
.alloc = gic_irq_domain_alloc,
|
|
|
|
.free = gic_irq_domain_free,
|
2014-06-30 19:01:31 +04:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init gic_of_init(struct device_node *node, struct device_node *parent)
|
|
|
|
{
|
|
|
|
void __iomem *dist_base;
|
2014-11-24 17:35:10 +03:00
|
|
|
struct redist_region *rdist_regs;
|
2014-06-30 19:01:31 +04:00
|
|
|
u64 redist_stride;
|
2014-11-24 17:35:10 +03:00
|
|
|
u32 nr_redist_regions;
|
|
|
|
u32 typer;
|
2014-06-30 19:01:31 +04:00
|
|
|
u32 reg;
|
|
|
|
int gic_irqs;
|
|
|
|
int err;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
dist_base = of_iomap(node, 0);
|
|
|
|
if (!dist_base) {
|
|
|
|
pr_err("%s: unable to map gic dist registers\n",
|
|
|
|
node->full_name);
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
|
|
|
|
if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) {
|
|
|
|
pr_err("%s: no distributor detected, giving up\n",
|
|
|
|
node->full_name);
|
|
|
|
err = -ENODEV;
|
|
|
|
goto out_unmap_dist;
|
|
|
|
}
|
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
|
|
|
|
nr_redist_regions = 1;
|
2014-06-30 19:01:31 +04:00
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
|
|
|
|
if (!rdist_regs) {
|
2014-06-30 19:01:31 +04:00
|
|
|
err = -ENOMEM;
|
|
|
|
goto out_unmap_dist;
|
|
|
|
}
|
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
for (i = 0; i < nr_redist_regions; i++) {
|
|
|
|
struct resource res;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = of_address_to_resource(node, 1 + i, &res);
|
|
|
|
rdist_regs[i].redist_base = of_iomap(node, 1 + i);
|
|
|
|
if (ret || !rdist_regs[i].redist_base) {
|
2014-06-30 19:01:31 +04:00
|
|
|
pr_err("%s: couldn't map region %d\n",
|
|
|
|
node->full_name, i);
|
|
|
|
err = -ENODEV;
|
|
|
|
goto out_unmap_rdist;
|
|
|
|
}
|
2014-11-24 17:35:10 +03:00
|
|
|
rdist_regs[i].phys_base = res.start;
|
2014-06-30 19:01:31 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
|
|
|
|
redist_stride = 0;
|
|
|
|
|
|
|
|
gic_data.dist_base = dist_base;
|
2014-11-24 17:35:10 +03:00
|
|
|
gic_data.redist_regions = rdist_regs;
|
|
|
|
gic_data.nr_redist_regions = nr_redist_regions;
|
2014-06-30 19:01:31 +04:00
|
|
|
gic_data.redist_stride = redist_stride;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find out how many interrupts are supported.
|
|
|
|
* The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
|
|
|
|
*/
|
2014-11-24 17:35:10 +03:00
|
|
|
typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
|
|
|
|
gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
|
|
|
|
gic_irqs = GICD_TYPER_IRQS(typer);
|
2014-06-30 19:01:31 +04:00
|
|
|
if (gic_irqs > 1020)
|
|
|
|
gic_irqs = 1020;
|
|
|
|
gic_data.irq_nr = gic_irqs;
|
|
|
|
|
|
|
|
gic_data.domain = irq_domain_add_tree(node, &gic_irq_domain_ops,
|
|
|
|
&gic_data);
|
2014-11-24 17:35:10 +03:00
|
|
|
gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
|
2014-06-30 19:01:31 +04:00
|
|
|
|
2014-11-24 17:35:10 +03:00
|
|
|
if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
|
2014-06-30 19:01:31 +04:00
|
|
|
err = -ENOMEM;
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
|
|
|
|
set_handle_irq(gic_handle_irq);
|
|
|
|
|
2014-11-24 17:35:18 +03:00
|
|
|
if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
|
|
|
|
its_init(node, &gic_data.rdists, gic_data.domain);
|
|
|
|
|
2014-06-30 19:01:31 +04:00
|
|
|
gic_smp_init();
|
|
|
|
gic_dist_init();
|
|
|
|
gic_cpu_init();
|
2014-08-26 19:03:35 +04:00
|
|
|
gic_cpu_pm_init();
|
2014-06-30 19:01:31 +04:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_free:
|
|
|
|
if (gic_data.domain)
|
|
|
|
irq_domain_remove(gic_data.domain);
|
2014-11-24 17:35:10 +03:00
|
|
|
free_percpu(gic_data.rdists.rdist);
|
2014-06-30 19:01:31 +04:00
|
|
|
out_unmap_rdist:
|
2014-11-24 17:35:10 +03:00
|
|
|
for (i = 0; i < nr_redist_regions; i++)
|
|
|
|
if (rdist_regs[i].redist_base)
|
|
|
|
iounmap(rdist_regs[i].redist_base);
|
|
|
|
kfree(rdist_regs);
|
2014-06-30 19:01:31 +04:00
|
|
|
out_unmap_dist:
|
|
|
|
iounmap(dist_base);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
|