irqchip: gic-v3: Initial support for GICv3
The Generic Interrupt Controller (version 3) offers services that are similar to GICv2, with a number of additional features: - Affinity routing based on the CPU MPIDR (ARE) - System register for the CPU interfaces (SRE) - Support for more that 8 CPUs - Locality-specific Peripheral Interrupts (LPIs) - Interrupt Translation Services (ITS) This patch adds preliminary support for GICv3 with ARE and SRE, non-secure mode only. It relies on higher exception levels to grant ARE and SRE access. Support for LPI and ITS will be added at a later time. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Reviewed-by: Zi Shen Lim <zlim@broadcom.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by: Tirumalesh Chalamarla <tchalamarla@cavium.com> Reviewed-by: Yun Wu <wuyun.wu@huawei.com> Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com> Tested-by: Tirumalesh Chalamarla<tchalamarla@cavium.com> Tested-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com> Acked-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Link: https://lkml.kernel.org/r/1404140510-5382-3-git-send-email-marc.zyngier@arm.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Marc Zyngier
Jason Cooper
parent
d51d0af43b
commit
021f653791
7 changed files with 916 additions and 0 deletions
|
|
@ -9,6 +9,7 @@ config ARM64
|
|||
select ARM_AMBA
|
||||
select ARM_ARCH_TIMER
|
||||
select ARM_GIC
|
||||
select ARM_GIC_V3
|
||||
select BUILDTIME_EXTABLE_SORT
|
||||
select CLONE_BACKWARDS
|
||||
select COMMON_CLK
|
||||
|
|
|
|||
|
|
@ -22,6 +22,7 @@
|
|||
|
||||
#include <linux/linkage.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/irqchip/arm-gic-v3.h>
|
||||
|
||||
#include <asm/assembler.h>
|
||||
#include <asm/ptrace.h>
|
||||
|
|
@ -296,6 +297,23 @@ CPU_LE( bic x0, x0, #(3 << 24) ) // Clear the EE and E0E bits for EL1
|
|||
msr cnthctl_el2, x0
|
||||
msr cntvoff_el2, xzr // Clear virtual offset
|
||||
|
||||
#ifdef CONFIG_ARM_GIC_V3
|
||||
/* GICv3 system register access */
|
||||
mrs x0, id_aa64pfr0_el1
|
||||
ubfx x0, x0, #24, #4
|
||||
cmp x0, #1
|
||||
b.ne 3f
|
||||
|
||||
mrs x0, ICC_SRE_EL2
|
||||
orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1
|
||||
orr x0, x0, #ICC_SRE_EL2_ENABLE // Set ICC_SRE_EL2.Enable==1
|
||||
msr ICC_SRE_EL2, x0
|
||||
isb // Make sure SRE is now set
|
||||
msr ICH_HCR_EL2, xzr // Reset ICC_HCR_EL2 to defaults
|
||||
|
||||
3:
|
||||
#endif
|
||||
|
||||
/* Populate ID registers. */
|
||||
mrs x0, midr_el1
|
||||
mrs x1, mpidr_el1
|
||||
|
|
|
|||
|
|
@ -19,6 +19,7 @@
|
|||
|
||||
#include <linux/init.h>
|
||||
#include <linux/linkage.h>
|
||||
#include <linux/irqchip/arm-gic-v3.h>
|
||||
|
||||
#include <asm/assembler.h>
|
||||
#include <asm/ptrace.h>
|
||||
|
|
|
|||
|
|
@ -10,6 +10,11 @@ config ARM_GIC
|
|||
config GIC_NON_BANKED
|
||||
bool
|
||||
|
||||
config ARM_GIC_V3
|
||||
bool
|
||||
select IRQ_DOMAIN
|
||||
select MULTI_IRQ_HANDLER
|
||||
|
||||
config ARM_NVIC
|
||||
bool
|
||||
select IRQ_DOMAIN
|
||||
|
|
|
|||
|
|
@ -16,6 +16,7 @@ obj-$(CONFIG_ARCH_SUNXI) += irq-sun4i.o
|
|||
obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi-nmi.o
|
||||
obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o
|
||||
obj-$(CONFIG_ARM_GIC) += irq-gic.o irq-gic-common.o
|
||||
obj-$(CONFIG_ARM_GIC_V3) += irq-gic-v3.o irq-gic-common.o
|
||||
obj-$(CONFIG_ARM_NVIC) += irq-nvic.o
|
||||
obj-$(CONFIG_ARM_VIC) += irq-vic.o
|
||||
obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o
|
||||
|
|
|
|||
692
drivers/irqchip/irq-gic-v3.c
Normal file
692
drivers/irqchip/irq-gic-v3.c
Normal file
|
|
@ -0,0 +1,692 @@
|
|||
/*
|
||||
* 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>
|
||||
#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"
|
||||
|
||||
struct gic_chip_data {
|
||||
void __iomem *dist_base;
|
||||
void __iomem **redist_base;
|
||||
void __percpu __iomem **rdist;
|
||||
struct irq_domain *domain;
|
||||
u64 redist_stride;
|
||||
u32 redist_regions;
|
||||
unsigned int irq_nr;
|
||||
};
|
||||
|
||||
static struct gic_chip_data gic_data __read_mostly;
|
||||
|
||||
#define gic_data_rdist() (this_cpu_ptr(gic_data.rdist))
|
||||
#define gic_data_rdist_rd_base() (*gic_data_rdist())
|
||||
#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;
|
||||
|
||||
if (d->hwirq >= 8192)
|
||||
BUG(); /* LPI Detected!!! */
|
||||
|
||||
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 */
|
||||
static u64 gic_read_iar(void)
|
||||
{
|
||||
u64 irqstat;
|
||||
|
||||
asm volatile("mrs %0, " __stringify(ICC_IAR1_EL1) : "=r" (irqstat));
|
||||
return irqstat;
|
||||
}
|
||||
|
||||
static void gic_write_pmr(u64 val)
|
||||
{
|
||||
asm volatile("msr " __stringify(ICC_PMR_EL1) ", %0" : : "r" (val));
|
||||
}
|
||||
|
||||
static void gic_write_ctlr(u64 val)
|
||||
{
|
||||
asm volatile("msr " __stringify(ICC_CTLR_EL1) ", %0" : : "r" (val));
|
||||
isb();
|
||||
}
|
||||
|
||||
static void gic_write_grpen1(u64 val)
|
||||
{
|
||||
asm volatile("msr " __stringify(ICC_GRPEN1_EL1) ", %0" : : "r" (val));
|
||||
isb();
|
||||
}
|
||||
|
||||
static void gic_write_sgi1r(u64 val)
|
||||
{
|
||||
asm volatile("msr " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val));
|
||||
}
|
||||
|
||||
static void gic_enable_sre(void)
|
||||
{
|
||||
u64 val;
|
||||
|
||||
asm volatile("mrs %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
|
||||
val |= ICC_SRE_EL1_SRE;
|
||||
asm volatile("msr " __stringify(ICC_SRE_EL1) ", %0" : : "r" (val));
|
||||
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.
|
||||
*/
|
||||
asm volatile("mrs %0, " __stringify(ICC_SRE_EL1) : "=r" (val));
|
||||
if (!(val & ICC_SRE_EL1_SRE))
|
||||
pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
|
||||
}
|
||||
|
||||
static void gic_enable_redist(void)
|
||||
{
|
||||
void __iomem *rbase;
|
||||
u32 count = 1000000; /* 1s! */
|
||||
u32 val;
|
||||
|
||||
rbase = gic_data_rdist_rd_base();
|
||||
|
||||
/* Wake up this CPU redistributor */
|
||||
val = readl_relaxed(rbase + GICR_WAKER);
|
||||
val &= ~GICR_WAKER_ProcessorSleep;
|
||||
writel_relaxed(val, rbase + GICR_WAKER);
|
||||
|
||||
while (readl_relaxed(rbase + GICR_WAKER) & GICR_WAKER_ChildrenAsleep) {
|
||||
count--;
|
||||
if (!count) {
|
||||
pr_err_ratelimited("redist didn't wake up...\n");
|
||||
return;
|
||||
}
|
||||
cpu_relax();
|
||||
udelay(1);
|
||||
};
|
||||
}
|
||||
|
||||
/*
|
||||
* 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 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);
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
|
||||
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;
|
||||
}
|
||||
|
||||
gic_configure_irq(irq, type, base, rwp_wait);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
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();
|
||||
|
||||
if (likely(irqnr > 15 && irqnr < 1020)) {
|
||||
u64 irq = irq_find_mapping(gic_data.domain, irqnr);
|
||||
if (likely(irq)) {
|
||||
handle_IRQ(irq, regs);
|
||||
continue;
|
||||
}
|
||||
|
||||
WARN_ONCE(true, "Unexpected SPI received!\n");
|
||||
gic_write_eoir(irqnr);
|
||||
}
|
||||
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));
|
||||
|
||||
for (i = 0; i < gic_data.redist_regions; i++) {
|
||||
void __iomem *ptr = gic_data.redist_base[i];
|
||||
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) {
|
||||
gic_data_rdist_rd_base() = ptr;
|
||||
pr_info("CPU%d: found redistributor %llx @%p\n",
|
||||
smp_processor_id(),
|
||||
(unsigned long long)mpidr, ptr);
|
||||
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;
|
||||
}
|
||||
|
||||
static void gic_cpu_init(void)
|
||||
{
|
||||
void __iomem *rbase;
|
||||
|
||||
/* Register ourselves with the rest of the world */
|
||||
if (gic_populate_rdist())
|
||||
return;
|
||||
|
||||
gic_enable_redist();
|
||||
|
||||
rbase = gic_data_rdist_sgi_base();
|
||||
|
||||
gic_cpu_config(rbase, gic_redist_wait_for_rwp);
|
||||
|
||||
/* 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);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
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;
|
||||
}
|
||||
|
||||
static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
|
||||
{
|
||||
u64 val;
|
||||
|
||||
val = (MPIDR_AFFINITY_LEVEL(cluster_id, 3) << 48 |
|
||||
MPIDR_AFFINITY_LEVEL(cluster_id, 2) << 32 |
|
||||
irq << 24 |
|
||||
MPIDR_AFFINITY_LEVEL(cluster_id, 1) << 16 |
|
||||
tlist);
|
||||
|
||||
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
|
||||
|
||||
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,
|
||||
};
|
||||
|
||||
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;
|
||||
/* PPIs */
|
||||
if (hw < 32) {
|
||||
irq_set_percpu_devid(irq);
|
||||
irq_set_chip_and_handler(irq, &gic_chip,
|
||||
handle_percpu_devid_irq);
|
||||
set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
|
||||
}
|
||||
/* SPIs */
|
||||
if (hw >= 32 && hw < gic_data.irq_nr) {
|
||||
irq_set_chip_and_handler(irq, &gic_chip,
|
||||
handle_fasteoi_irq);
|
||||
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
|
||||
}
|
||||
irq_set_chip_data(irq, d->host_data);
|
||||
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;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct irq_domain_ops gic_irq_domain_ops = {
|
||||
.map = gic_irq_domain_map,
|
||||
.xlate = gic_irq_domain_xlate,
|
||||
};
|
||||
|
||||
static int __init gic_of_init(struct device_node *node, struct device_node *parent)
|
||||
{
|
||||
void __iomem *dist_base;
|
||||
void __iomem **redist_base;
|
||||
u64 redist_stride;
|
||||
u32 redist_regions;
|
||||
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;
|
||||
}
|
||||
|
||||
if (of_property_read_u32(node, "#redistributor-regions", &redist_regions))
|
||||
redist_regions = 1;
|
||||
|
||||
redist_base = kzalloc(sizeof(*redist_base) * redist_regions, GFP_KERNEL);
|
||||
if (!redist_base) {
|
||||
err = -ENOMEM;
|
||||
goto out_unmap_dist;
|
||||
}
|
||||
|
||||
for (i = 0; i < redist_regions; i++) {
|
||||
redist_base[i] = of_iomap(node, 1 + i);
|
||||
if (!redist_base[i]) {
|
||||
pr_err("%s: couldn't map region %d\n",
|
||||
node->full_name, i);
|
||||
err = -ENODEV;
|
||||
goto out_unmap_rdist;
|
||||
}
|
||||
}
|
||||
|
||||
if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
|
||||
redist_stride = 0;
|
||||
|
||||
gic_data.dist_base = dist_base;
|
||||
gic_data.redist_base = redist_base;
|
||||
gic_data.redist_regions = redist_regions;
|
||||
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)
|
||||
*/
|
||||
gic_irqs = readl_relaxed(gic_data.dist_base + GICD_TYPER) & 0x1f;
|
||||
gic_irqs = (gic_irqs + 1) * 32;
|
||||
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);
|
||||
gic_data.rdist = alloc_percpu(typeof(*gic_data.rdist));
|
||||
|
||||
if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdist)) {
|
||||
err = -ENOMEM;
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
set_handle_irq(gic_handle_irq);
|
||||
|
||||
gic_smp_init();
|
||||
gic_dist_init();
|
||||
gic_cpu_init();
|
||||
|
||||
return 0;
|
||||
|
||||
out_free:
|
||||
if (gic_data.domain)
|
||||
irq_domain_remove(gic_data.domain);
|
||||
free_percpu(gic_data.rdist);
|
||||
out_unmap_rdist:
|
||||
for (i = 0; i < redist_regions; i++)
|
||||
if (redist_base[i])
|
||||
iounmap(redist_base[i]);
|
||||
kfree(redist_base);
|
||||
out_unmap_dist:
|
||||
iounmap(dist_base);
|
||||
return err;
|
||||
}
|
||||
|
||||
IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
|
||||
198
include/linux/irqchip/arm-gic-v3.h
Normal file
198
include/linux/irqchip/arm-gic-v3.h
Normal file
|
|
@ -0,0 +1,198 @@
|
|||
/*
|
||||
* 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/>.
|
||||
*/
|
||||
#ifndef __LINUX_IRQCHIP_ARM_GIC_V3_H
|
||||
#define __LINUX_IRQCHIP_ARM_GIC_V3_H
|
||||
|
||||
/*
|
||||
* Distributor registers. We assume we're running non-secure, with ARE
|
||||
* being set. Secure-only and non-ARE registers are not described.
|
||||
*/
|
||||
#define GICD_CTLR 0x0000
|
||||
#define GICD_TYPER 0x0004
|
||||
#define GICD_IIDR 0x0008
|
||||
#define GICD_STATUSR 0x0010
|
||||
#define GICD_SETSPI_NSR 0x0040
|
||||
#define GICD_CLRSPI_NSR 0x0048
|
||||
#define GICD_SETSPI_SR 0x0050
|
||||
#define GICD_CLRSPI_SR 0x0058
|
||||
#define GICD_SEIR 0x0068
|
||||
#define GICD_ISENABLER 0x0100
|
||||
#define GICD_ICENABLER 0x0180
|
||||
#define GICD_ISPENDR 0x0200
|
||||
#define GICD_ICPENDR 0x0280
|
||||
#define GICD_ISACTIVER 0x0300
|
||||
#define GICD_ICACTIVER 0x0380
|
||||
#define GICD_IPRIORITYR 0x0400
|
||||
#define GICD_ICFGR 0x0C00
|
||||
#define GICD_IROUTER 0x6000
|
||||
#define GICD_PIDR2 0xFFE8
|
||||
|
||||
#define GICD_CTLR_RWP (1U << 31)
|
||||
#define GICD_CTLR_ARE_NS (1U << 4)
|
||||
#define GICD_CTLR_ENABLE_G1A (1U << 1)
|
||||
#define GICD_CTLR_ENABLE_G1 (1U << 0)
|
||||
|
||||
#define GICD_IROUTER_SPI_MODE_ONE (0U << 31)
|
||||
#define GICD_IROUTER_SPI_MODE_ANY (1U << 31)
|
||||
|
||||
#define GIC_PIDR2_ARCH_MASK 0xf0
|
||||
#define GIC_PIDR2_ARCH_GICv3 0x30
|
||||
#define GIC_PIDR2_ARCH_GICv4 0x40
|
||||
|
||||
/*
|
||||
* Re-Distributor registers, offsets from RD_base
|
||||
*/
|
||||
#define GICR_CTLR GICD_CTLR
|
||||
#define GICR_IIDR 0x0004
|
||||
#define GICR_TYPER 0x0008
|
||||
#define GICR_STATUSR GICD_STATUSR
|
||||
#define GICR_WAKER 0x0014
|
||||
#define GICR_SETLPIR 0x0040
|
||||
#define GICR_CLRLPIR 0x0048
|
||||
#define GICR_SEIR GICD_SEIR
|
||||
#define GICR_PROPBASER 0x0070
|
||||
#define GICR_PENDBASER 0x0078
|
||||
#define GICR_INVLPIR 0x00A0
|
||||
#define GICR_INVALLR 0x00B0
|
||||
#define GICR_SYNCR 0x00C0
|
||||
#define GICR_MOVLPIR 0x0100
|
||||
#define GICR_MOVALLR 0x0110
|
||||
#define GICR_PIDR2 GICD_PIDR2
|
||||
|
||||
#define GICR_WAKER_ProcessorSleep (1U << 1)
|
||||
#define GICR_WAKER_ChildrenAsleep (1U << 2)
|
||||
|
||||
/*
|
||||
* Re-Distributor registers, offsets from SGI_base
|
||||
*/
|
||||
#define GICR_ISENABLER0 GICD_ISENABLER
|
||||
#define GICR_ICENABLER0 GICD_ICENABLER
|
||||
#define GICR_ISPENDR0 GICD_ISPENDR
|
||||
#define GICR_ICPENDR0 GICD_ICPENDR
|
||||
#define GICR_ISACTIVER0 GICD_ISACTIVER
|
||||
#define GICR_ICACTIVER0 GICD_ICACTIVER
|
||||
#define GICR_IPRIORITYR0 GICD_IPRIORITYR
|
||||
#define GICR_ICFGR0 GICD_ICFGR
|
||||
|
||||
#define GICR_TYPER_VLPIS (1U << 1)
|
||||
#define GICR_TYPER_LAST (1U << 4)
|
||||
|
||||
/*
|
||||
* CPU interface registers
|
||||
*/
|
||||
#define ICC_CTLR_EL1_EOImode_drop_dir (0U << 1)
|
||||
#define ICC_CTLR_EL1_EOImode_drop (1U << 1)
|
||||
#define ICC_SRE_EL1_SRE (1U << 0)
|
||||
|
||||
/*
|
||||
* Hypervisor interface registers (SRE only)
|
||||
*/
|
||||
#define ICH_LR_VIRTUAL_ID_MASK ((1UL << 32) - 1)
|
||||
|
||||
#define ICH_LR_EOI (1UL << 41)
|
||||
#define ICH_LR_GROUP (1UL << 60)
|
||||
#define ICH_LR_STATE (3UL << 62)
|
||||
#define ICH_LR_PENDING_BIT (1UL << 62)
|
||||
#define ICH_LR_ACTIVE_BIT (1UL << 63)
|
||||
|
||||
#define ICH_MISR_EOI (1 << 0)
|
||||
#define ICH_MISR_U (1 << 1)
|
||||
|
||||
#define ICH_HCR_EN (1 << 0)
|
||||
#define ICH_HCR_UIE (1 << 1)
|
||||
|
||||
#define ICH_VMCR_CTLR_SHIFT 0
|
||||
#define ICH_VMCR_CTLR_MASK (0x21f << ICH_VMCR_CTLR_SHIFT)
|
||||
#define ICH_VMCR_BPR1_SHIFT 18
|
||||
#define ICH_VMCR_BPR1_MASK (7 << ICH_VMCR_BPR1_SHIFT)
|
||||
#define ICH_VMCR_BPR0_SHIFT 21
|
||||
#define ICH_VMCR_BPR0_MASK (7 << ICH_VMCR_BPR0_SHIFT)
|
||||
#define ICH_VMCR_PMR_SHIFT 24
|
||||
#define ICH_VMCR_PMR_MASK (0xffUL << ICH_VMCR_PMR_SHIFT)
|
||||
|
||||
#define ICC_EOIR1_EL1 S3_0_C12_C12_1
|
||||
#define ICC_IAR1_EL1 S3_0_C12_C12_0
|
||||
#define ICC_SGI1R_EL1 S3_0_C12_C11_5
|
||||
#define ICC_PMR_EL1 S3_0_C4_C6_0
|
||||
#define ICC_CTLR_EL1 S3_0_C12_C12_4
|
||||
#define ICC_SRE_EL1 S3_0_C12_C12_5
|
||||
#define ICC_GRPEN1_EL1 S3_0_C12_C12_7
|
||||
|
||||
#define ICC_IAR1_EL1_SPURIOUS 0x3ff
|
||||
|
||||
#define ICC_SRE_EL2 S3_4_C12_C9_5
|
||||
|
||||
#define ICC_SRE_EL2_SRE (1 << 0)
|
||||
#define ICC_SRE_EL2_ENABLE (1 << 3)
|
||||
|
||||
/*
|
||||
* System register definitions
|
||||
*/
|
||||
#define ICH_VSEIR_EL2 S3_4_C12_C9_4
|
||||
#define ICH_HCR_EL2 S3_4_C12_C11_0
|
||||
#define ICH_VTR_EL2 S3_4_C12_C11_1
|
||||
#define ICH_MISR_EL2 S3_4_C12_C11_2
|
||||
#define ICH_EISR_EL2 S3_4_C12_C11_3
|
||||
#define ICH_ELSR_EL2 S3_4_C12_C11_5
|
||||
#define ICH_VMCR_EL2 S3_4_C12_C11_7
|
||||
|
||||
#define __LR0_EL2(x) S3_4_C12_C12_ ## x
|
||||
#define __LR8_EL2(x) S3_4_C12_C13_ ## x
|
||||
|
||||
#define ICH_LR0_EL2 __LR0_EL2(0)
|
||||
#define ICH_LR1_EL2 __LR0_EL2(1)
|
||||
#define ICH_LR2_EL2 __LR0_EL2(2)
|
||||
#define ICH_LR3_EL2 __LR0_EL2(3)
|
||||
#define ICH_LR4_EL2 __LR0_EL2(4)
|
||||
#define ICH_LR5_EL2 __LR0_EL2(5)
|
||||
#define ICH_LR6_EL2 __LR0_EL2(6)
|
||||
#define ICH_LR7_EL2 __LR0_EL2(7)
|
||||
#define ICH_LR8_EL2 __LR8_EL2(0)
|
||||
#define ICH_LR9_EL2 __LR8_EL2(1)
|
||||
#define ICH_LR10_EL2 __LR8_EL2(2)
|
||||
#define ICH_LR11_EL2 __LR8_EL2(3)
|
||||
#define ICH_LR12_EL2 __LR8_EL2(4)
|
||||
#define ICH_LR13_EL2 __LR8_EL2(5)
|
||||
#define ICH_LR14_EL2 __LR8_EL2(6)
|
||||
#define ICH_LR15_EL2 __LR8_EL2(7)
|
||||
|
||||
#define __AP0Rx_EL2(x) S3_4_C12_C8_ ## x
|
||||
#define ICH_AP0R0_EL2 __AP0Rx_EL2(0)
|
||||
#define ICH_AP0R1_EL2 __AP0Rx_EL2(1)
|
||||
#define ICH_AP0R2_EL2 __AP0Rx_EL2(2)
|
||||
#define ICH_AP0R3_EL2 __AP0Rx_EL2(3)
|
||||
|
||||
#define __AP1Rx_EL2(x) S3_4_C12_C9_ ## x
|
||||
#define ICH_AP1R0_EL2 __AP1Rx_EL2(0)
|
||||
#define ICH_AP1R1_EL2 __AP1Rx_EL2(1)
|
||||
#define ICH_AP1R2_EL2 __AP1Rx_EL2(2)
|
||||
#define ICH_AP1R3_EL2 __AP1Rx_EL2(3)
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
#include <linux/stringify.h>
|
||||
|
||||
static inline void gic_write_eoir(u64 irq)
|
||||
{
|
||||
asm volatile("msr " __stringify(ICC_EOIR1_EL1) ", %0" : : "r" (irq));
|
||||
isb();
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue