[PATCH 18/24] irqchip: mips-gic: Stop using per-platform mapping tables

From: Andrew Bresticker
Date: Mon Sep 15 2014 - 19:53:59 EST

Now that the GIC properly uses IRQ domains, kill off the per-platform
routing tables that were used to make the GIC appear transparent.

This includes:
- removing the mapping tables and the support for applying them,
- moving GIC IPI support to the GIC driver,
- properly routing the i8259 through the GIC on Malta, and
- updating IRQ assignments on SEAD-3 when the GIC is present.

Platforms no longer will pass an interrupt mapping table to gic_init.
Instead, they will pass the CPU interrupt vector (2 - 7) that they
expect the GIC to route interrupts to. Note that in EIC mode this
value is ignored and all GIC interrupts are routed to EIC vector 1.

Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
---
I'm not sure what other external interrupts (if any) are also routed
through the GIC on Malta boards. In particular I'm concerned about
the MSC01 IRQ chip and the CoreHi interrupt. Neither of these matter
a whole lot since we don't use any MSC01 interrupts and the CoreHI
interrupt is fatal.
---
arch/mips/include/asm/gic.h | 35 +----
arch/mips/include/asm/mips-boards/maltaint.h | 14 +-
arch/mips/include/asm/mips-boards/sead3int.h | 13 ++
arch/mips/kernel/cevt-gic.c | 3 +-
arch/mips/mti-malta/malta-int.c | 189 +++++--------------------
arch/mips/mti-sead3/sead3-ehci.c | 8 +-
arch/mips/mti-sead3/sead3-int.c | 28 +---
arch/mips/mti-sead3/sead3-net.c | 14 +-
arch/mips/mti-sead3/sead3-platform.c | 18 ++-
drivers/irqchip/irq-mips-gic.c | 201 ++++++++++++++-------------
10 files changed, 198 insertions(+), 325 deletions(-)

diff --git a/arch/mips/include/asm/gic.h b/arch/mips/include/asm/gic.h
index efcf4de..cfbf907 100644
--- a/arch/mips/include/asm/gic.h
+++ b/arch/mips/include/asm/gic.h
@@ -316,31 +316,6 @@
GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe)), \
GIC_SH_MAP_TO_VPE_REG_BIT(vpe))

-/*
- * Interrupt Meta-data specification. The ipiflag helps
- * in building ipi_map.
- */
-struct gic_intr_map {
- unsigned int cpunum; /* Directed to this CPU */
-#define GIC_UNUSED 0xdead /* Dummy data */
- unsigned int pin; /* Directed to this Pin */
- unsigned int polarity; /* Polarity : +/- */
- unsigned int trigtype; /* Trigger : Edge/Levl */
- unsigned int flags; /* Misc flags */
-#define GIC_FLAG_TRANSPARENT 0x01
-};
-
-/*
- * This is only used in EIC mode. This helps to figure out which
- * shared interrupts we need to process when we get a vector interrupt.
- */
-#define GIC_MAX_SHARED_INTR 0x5
-struct gic_shared_intr_map {
- unsigned int num_shared_intr;
- unsigned int intr_list[GIC_MAX_SHARED_INTR];
- unsigned int local_intr_mask;
-};
-
/* GIC nomenclature for Core Interrupt Pins. */
#define GIC_CPU_INT0 0 /* Core Interrupt 2 */
#define GIC_CPU_INT1 1 /* . */
@@ -349,6 +324,9 @@ struct gic_shared_intr_map {
#define GIC_CPU_INT4 4 /* . */
#define GIC_CPU_INT5 5 /* Core Interrupt 7 */

+/* Add 2 to convert GIC CPU pin to core interrupt */
+#define GIC_CPU_PIN_OFFSET 2
+
/* Local GIC interrupts. */
#define GIC_INT_TMR (GIC_CPU_INT5)
#define GIC_INT_PERFCTR (GIC_CPU_INT5)
@@ -365,13 +343,12 @@ struct gic_shared_intr_map {
extern unsigned int gic_present;
extern unsigned int gic_frequency;
extern unsigned long _gic_base;
-extern unsigned int gic_irq_base;
extern unsigned int gic_irq_flags[];
-extern struct gic_shared_intr_map gic_shared_intr_map[];
+extern unsigned int gic_cpu_pin;

extern void gic_init(unsigned long gic_base_addr,
- unsigned long gic_addrspace_size, struct gic_intr_map *intrmap,
- unsigned int intrmap_size, unsigned int irqbase);
+ unsigned long gic_addrspace_size, unsigned int cpu_vec,
+ unsigned int irqbase);
extern void gic_clocksource_init(unsigned int);
extern unsigned int gic_compare_int (void);
extern cycle_t gic_read_count(void);
diff --git a/arch/mips/include/asm/mips-boards/maltaint.h b/arch/mips/include/asm/mips-boards/maltaint.h
index d741628..bdd6f39 100644
--- a/arch/mips/include/asm/mips-boards/maltaint.h
+++ b/arch/mips/include/asm/mips-boards/maltaint.h
@@ -20,11 +20,10 @@
#define MIPSCPU_INT_SW1 1
#define MIPSCPU_INT_MB0 2
#define MIPSCPU_INT_I8259A MIPSCPU_INT_MB0
+#define MIPSCPU_INT_GIC MIPSCPU_INT_MB0 /* GIC chained interrupt */
#define MIPSCPU_INT_MB1 3
#define MIPSCPU_INT_SMI MIPSCPU_INT_MB1
-#define MIPSCPU_INT_IPI0 MIPSCPU_INT_MB1 /* GIC IPI */
#define MIPSCPU_INT_MB2 4
-#define MIPSCPU_INT_IPI1 MIPSCPU_INT_MB2 /* GIC IPI */
#define MIPSCPU_INT_MB3 5
#define MIPSCPU_INT_COREHI MIPSCPU_INT_MB3
#define MIPSCPU_INT_MB4 6
@@ -61,14 +60,7 @@
#define MSC01E_INT_PERFCTR 10
#define MSC01E_INT_CPUCTR 11

-/* External Interrupts used for IPI */
-#define GIC_IPI_EXT_INTR_RESCHED_VPE0 16
-#define GIC_IPI_EXT_INTR_CALLFNC_VPE0 17
-#define GIC_IPI_EXT_INTR_RESCHED_VPE1 18
-#define GIC_IPI_EXT_INTR_CALLFNC_VPE1 19
-#define GIC_IPI_EXT_INTR_RESCHED_VPE2 20
-#define GIC_IPI_EXT_INTR_CALLFNC_VPE2 21
-#define GIC_IPI_EXT_INTR_RESCHED_VPE3 22
-#define GIC_IPI_EXT_INTR_CALLFNC_VPE3 23
+/* GIC external interrupts */
+#define GIC_INT_I8259A 3

#endif /* !(_MIPS_MALTAINT_H) */
diff --git a/arch/mips/include/asm/mips-boards/sead3int.h b/arch/mips/include/asm/mips-boards/sead3int.h
index 11ebec9..a2e0095 100644
--- a/arch/mips/include/asm/mips-boards/sead3int.h
+++ b/arch/mips/include/asm/mips-boards/sead3int.h
@@ -14,4 +14,17 @@
#define GIC_BASE_ADDR 0x1b1c0000
#define GIC_ADDRSPACE_SZ (128 * 1024)

+/* CPU interrupt offsets */
+#define CPU_INT_GIC 2
+#define CPU_INT_EHCI 2
+#define CPU_INT_UART0 4
+#define CPU_INT_UART1 4
+#define CPU_INT_NET 6
+
+/* GIC interrupt offsets */
+#define GIC_INT_NET 0
+#define GIC_INT_UART1 2
+#define GIC_INT_UART0 3
+#define GIC_INT_EHCI 5
+
#endif /* !(_MIPS_SEAD3INT_H) */
diff --git a/arch/mips/kernel/cevt-gic.c b/arch/mips/kernel/cevt-gic.c
index 6093716..a90bd4c 100644
--- a/arch/mips/kernel/cevt-gic.c
+++ b/arch/mips/kernel/cevt-gic.c
@@ -91,7 +91,8 @@ int gic_clockevent_init(void)

clockevents_register_device(cd);

- GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_MAP), 0x80000002);
+ GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_MAP),
+ GIC_MAP_TO_PIN_MSK | gic_cpu_pin);
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), GIC_VPE_SMASK_CMP_MSK);

if (gic_timer_irq_installed)
diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
index e56563c..3b3bc1d 100644
--- a/arch/mips/mti-malta/malta-int.c
+++ b/arch/mips/mti-malta/malta-int.c
@@ -38,14 +38,9 @@
#include <asm/rtlx.h>

static unsigned long _msc01_biu_base;
-static unsigned int ipi_map[NR_CPUS];

static DEFINE_RAW_SPINLOCK(mips_irq_lock);

-#ifdef CONFIG_MIPS_GIC_IPI
-DECLARE_BITMAP(ipi_ints, GIC_NUM_INTRS);
-#endif
-
static inline int mips_pcibios_iack(void)
{
int irq;
@@ -127,24 +122,10 @@ static void malta_hw0_irqdispatch(void)
#endif
}

-static void malta_ipi_irqdispatch(void)
+static irqreturn_t i8259_handler(int irq, void *dev_id)
{
-#ifdef CONFIG_MIPS_GIC_IPI
- unsigned long irq;
- DECLARE_BITMAP(pending, GIC_NUM_INTRS);
-
- gic_get_int_mask(pending, ipi_ints);
-
- irq = find_first_bit(pending, GIC_NUM_INTRS);
-
- while (irq < GIC_NUM_INTRS) {
- do_IRQ(MIPS_GIC_IRQ_BASE + irq);
-
- irq = find_next_bit(pending, GIC_NUM_INTRS, irq + 1);
- }
-#endif
- if (gic_compare_int())
- do_IRQ(MIPS_GIC_IRQ_BASE);
+ malta_hw0_irqdispatch();
+ return IRQ_HANDLED;
}

static void corehi_irqdispatch(void)
@@ -203,6 +184,12 @@ static void corehi_irqdispatch(void)
die("CoreHi interrupt", regs);
}

+static irqreturn_t corehi_handler(int irq, void *dev_id)
+{
+ corehi_irqdispatch();
+ return IRQ_HANDLED;
+}
+
static inline int clz(unsigned long x)
{
__asm__(
@@ -286,10 +273,9 @@ asmlinkage void plat_irq_dispatch(void)

irq = irq_ffs(pending);

- if (irq == MIPSCPU_INT_I8259A)
- malta_hw0_irqdispatch();
- else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
- malta_ipi_irqdispatch();
+ /* HACK: GIC doesn't properly dispatch local interrupts yet */
+ if (gic_present && irq == MIPSCPU_INT_GIC && gic_compare_int())
+ do_IRQ(MIPS_GIC_IRQ_BASE);
else
do_IRQ(MIPS_CPU_IRQ_BASE + irq);
}
@@ -312,13 +298,6 @@ static void ipi_call_dispatch(void)
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
}

-#endif /* CONFIG_MIPS_MT_SMP */
-
-#ifdef CONFIG_MIPS_GIC_IPI
-
-#define GIC_MIPS_CPU_IPI_RESCHED_IRQ 3
-#define GIC_MIPS_CPU_IPI_CALL_IRQ 4
-
static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
{
#ifdef CONFIG_MIPS_VPE_APSP_API_CMP
@@ -349,31 +328,16 @@ static struct irqaction irq_call = {
.flags = IRQF_PERCPU,
.name = "IPI_call"
};
-#endif /* CONFIG_MIPS_GIC_IPI */
-
-static int gic_resched_int_base;
-static int gic_call_int_base;
-#define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu))
-#define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu))
-
-unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
-{
- return GIC_CALL_INT(cpu);
-}
-
-unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
-{
- return GIC_RESCHED_INT(cpu);
-}
+#endif /* CONFIG_MIPS_MT_SMP */

static struct irqaction i8259irq = {
- .handler = no_action,
+ .handler = i8259_handler,
.name = "XT-PIC cascade",
.flags = IRQF_NO_THREAD,
};

static struct irqaction corehi_irqaction = {
- .handler = no_action,
+ .handler = corehi_handler,
.name = "CoreHi",
.flags = IRQF_NO_THREAD,
};
@@ -399,60 +363,6 @@ static msc_irqmap_t msc_eicirqmap[] __initdata = {

static int msc_nr_eicirqs __initdata = ARRAY_SIZE(msc_eicirqmap);

-/*
- * This GIC specific tabular array defines the association between External
- * Interrupts and CPUs/Core Interrupts. The nature of the External
- * Interrupts is also defined here - polarity/trigger.
- */
-
-#define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
-#define X GIC_UNUSED
-
-static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
- { X, X, X, X, 0 },
- { X, X, X, X, 0 },
- { X, X, X, X, 0 },
- { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { X, X, X, X, 0 },
- { X, X, X, X, 0 },
- { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { X, X, X, X, 0 },
- /* The remainder of this table is initialised by fill_ipi_map */
-};
-#undef X
-
-#ifdef CONFIG_MIPS_GIC_IPI
-static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin)
-{
- int intr = baseintr + cpu;
- gic_intr_map[intr].cpunum = cpu;
- gic_intr_map[intr].pin = cpupin;
- gic_intr_map[intr].polarity = GIC_POL_POS;
- gic_intr_map[intr].trigtype = GIC_TRIG_EDGE;
- gic_intr_map[intr].flags = 0;
- ipi_map[cpu] |= (1 << (cpupin + 2));
- bitmap_set(ipi_ints, intr, 1);
-}
-
-static void __init fill_ipi_map(void)
-{
- int cpu;
-
- for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
- fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1);
- fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2);
- }
-}
-#endif
-
void __init arch_init_ipiirq(int irq, struct irqaction *action)
{
setup_irq(irq, action);
@@ -461,6 +371,8 @@ void __init arch_init_ipiirq(int irq, struct irqaction *action)

void __init arch_init_irq(void)
{
+ int corehi_irq, i8259_irq;
+
init_i8259_irqs();

if (!cpu_has_veic)
@@ -507,34 +419,11 @@ void __init arch_init_irq(void)
msc_nr_irqs);
}

- if (cpu_has_veic) {
- set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
- set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
- setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
- setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
- } else if (cpu_has_vint) {
- set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
- set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
- setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
- setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
- &corehi_irqaction);
- } else {
- setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
- setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
- &corehi_irqaction);
- }
-
if (gic_present) {
- /* FIXME */
int i;
-#if defined(CONFIG_MIPS_GIC_IPI)
- gic_call_int_base = GIC_NUM_INTRS -
- (NR_CPUS - nr_cpu_ids) * 2 - nr_cpu_ids;
- gic_resched_int_base = gic_call_int_base - nr_cpu_ids;
- fill_ipi_map();
-#endif
- gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
- ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
+
+ gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, MIPSCPU_INT_GIC,
+ MIPS_GIC_IRQ_BASE);
if (!mips_cm_present()) {
/* Enable the GIC */
i = REG(_msc01_biu_base, MSC01_SC_CFG);
@@ -542,28 +431,8 @@ void __init arch_init_irq(void)
(i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
pr_debug("GIC Enabled\n");
}
-#if defined(CONFIG_MIPS_GIC_IPI)
- /* set up ipi interrupts */
- if (cpu_has_vint) {
- set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
- set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
- }
- /* Argh.. this really needs sorting out.. */
- pr_info("CPU%d: status register was %08x\n",
- smp_processor_id(), read_c0_status());
- write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
- pr_info("CPU%d: status register now %08x\n",
- smp_processor_id(), read_c0_status());
- write_c0_status(0x1100dc00);
- pr_info("CPU%d: status register frc %08x\n",
- smp_processor_id(), read_c0_status());
- for (i = 0; i < nr_cpu_ids; i++) {
- arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
- GIC_RESCHED_INT(i), &irq_resched);
- arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
- GIC_CALL_INT(i), &irq_call);
- }
-#endif
+ i8259_irq = MIPS_GIC_IRQ_BASE + GIC_INT_I8259A;
+ corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
} else {
#if defined(CONFIG_MIPS_MT_SMP)
/* set up ipi interrupts */
@@ -587,7 +456,21 @@ void __init arch_init_irq(void)
arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
#endif
+ if (cpu_has_veic) {
+ set_vi_handler(MSC01E_INT_I8259A,
+ malta_hw0_irqdispatch);
+ set_vi_handler(MSC01E_INT_COREHI,
+ corehi_irqdispatch);
+ i8259_irq = MSC01E_INT_BASE + MSC01E_INT_I8259A;
+ corehi_irq = MSC01E_INT_BASE + MSC01E_INT_COREHI;
+ } else {
+ i8259_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_I8259A;
+ corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
+ }
}
+
+ setup_irq(i8259_irq, &i8259irq);
+ setup_irq(corehi_irq, &corehi_irqaction);
}

void malta_be_init(void)
diff --git a/arch/mips/mti-sead3/sead3-ehci.c b/arch/mips/mti-sead3/sead3-ehci.c
index 772fc05..4ddaa0f 100644
--- a/arch/mips/mti-sead3/sead3-ehci.c
+++ b/arch/mips/mti-sead3/sead3-ehci.c
@@ -10,6 +10,9 @@
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>

+#include <asm/gic.h>
+#include <asm/mips-boards/sead3int.h>
+
struct resource ehci_resources[] = {
{
.start = 0x1b200000,
@@ -17,7 +20,6 @@ struct resource ehci_resources[] = {
.flags = IORESOURCE_MEM
},
{
- .start = MIPS_CPU_IRQ_BASE + 2,
.flags = IORESOURCE_IRQ
}
};
@@ -37,6 +39,10 @@ static struct platform_device ehci_device = {

static int __init ehci_init(void)
{
+ if (gic_present)
+ ehci_resources[1].start = MIPS_GIC_IRQ_BASE + GIC_INT_EHCI;
+ else
+ ehci_resources[1].start = MIPS_CPU_IRQ_BASE + CPU_INT_EHCI;
return platform_device_register(&ehci_device);
}

diff --git a/arch/mips/mti-sead3/sead3-int.c b/arch/mips/mti-sead3/sead3-int.c
index 8f36342..cb06cd9 100644
--- a/arch/mips/mti-sead3/sead3-int.c
+++ b/arch/mips/mti-sead3/sead3-int.c
@@ -22,30 +22,6 @@

static unsigned long sead3_config_reg;

-/*
- * This table defines the setup for each external GIC interrupt. It is
- * indexed by interrupt number.
- */
-#define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
-static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
- { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
- { GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
-};
-
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
@@ -81,7 +57,7 @@ void __init arch_init_irq(void)
(current_cpu_data.options & MIPS_CPU_VEIC) ? "on" : "off");

if (gic_present)
- gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
- ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
+ gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, CPU_INT_GIC,
+ MIPS_GIC_IRQ_BASE);
}

diff --git a/arch/mips/mti-sead3/sead3-net.c b/arch/mips/mti-sead3/sead3-net.c
index dd11e7e..c9f728a 100644
--- a/arch/mips/mti-sead3/sead3-net.c
+++ b/arch/mips/mti-sead3/sead3-net.c
@@ -10,6 +10,9 @@
#include <linux/platform_device.h>
#include <linux/smsc911x.h>

+#include <asm/gic.h>
+#include <asm/mips-boards/sead3int.h>
+
static struct smsc911x_platform_config sead3_smsc911x_data = {
.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
.irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL,
@@ -17,14 +20,13 @@ static struct smsc911x_platform_config sead3_smsc911x_data = {
.phy_interface = PHY_INTERFACE_MODE_MII,
};

-struct resource sead3_net_resourcess[] = {
+struct resource sead3_net_resources[] = {
{
.start = 0x1f010000,
.end = 0x1f01ffff,
.flags = IORESOURCE_MEM
},
{
- .start = MIPS_CPU_IRQ_BASE + 6,
.flags = IORESOURCE_IRQ
}
};
@@ -35,12 +37,16 @@ static struct platform_device sead3_net_device = {
.dev = {
.platform_data = &sead3_smsc911x_data,
},
- .num_resources = ARRAY_SIZE(sead3_net_resourcess),
- .resource = sead3_net_resourcess
+ .num_resources = ARRAY_SIZE(sead3_net_resources),
+ .resource = sead3_net_resources
};

static int __init sead3_net_init(void)
{
+ if (gic_present)
+ sead3_net_resources[1].start = MIPS_GIC_IRQ_BASE + GIC_INT_NET;
+ else
+ sead3_net_resources[1].start = MIPS_CPU_IRQ_BASE + CPU_INT_NET;
return platform_device_register(&sead3_net_device);
}

diff --git a/arch/mips/mti-sead3/sead3-platform.c b/arch/mips/mti-sead3/sead3-platform.c
index 6c3b33d..d9661eb 100644
--- a/arch/mips/mti-sead3/sead3-platform.c
+++ b/arch/mips/mti-sead3/sead3-platform.c
@@ -9,10 +9,13 @@
#include <linux/init.h>
#include <linux/serial_8250.h>

-#define UART(base, int) \
+#include <asm/gic.h>
+#include <asm/mips-boards/sead3int.h>
+
+#define UART(base) \
{ \
.mapbase = base, \
- .irq = int, \
+ .irq = -1, \
.uartclk = 14745600, \
.iotype = UPIO_MEM32, \
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_IOREMAP, \
@@ -20,8 +23,8 @@
}

static struct plat_serial8250_port uart8250_data[] = {
- UART(0x1f000900, MIPS_CPU_IRQ_BASE + 4), /* ttyS0 = USB */
- UART(0x1f000800, MIPS_CPU_IRQ_BASE + 4), /* ttyS1 = RS232 */
+ UART(0x1f000900), /* ttyS0 = USB */
+ UART(0x1f000800), /* ttyS1 = RS232 */
{ },
};

@@ -35,6 +38,13 @@ static struct platform_device uart8250_device = {

static int __init uart8250_init(void)
{
+ if (gic_present) {
+ uart8250_data[0].irq = MIPS_GIC_IRQ_BASE + GIC_INT_UART0;
+ uart8250_data[1].irq = MIPS_GIC_IRQ_BASE + GIC_INT_UART1;
+ } else {
+ uart8250_data[0].irq = MIPS_CPU_IRQ_BASE + CPU_INT_UART0;
+ uart8250_data[1].irq = MIPS_CPU_IRQ_BASE + CPU_INT_UART1;
+ }
return platform_device_register(&uart8250_device);
}

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index b4d87c4..094be83 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -8,6 +8,8 @@
*/
#include <linux/bitmap.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
@@ -22,11 +24,8 @@
unsigned int gic_frequency;
unsigned int gic_present;
unsigned long _gic_base;
-unsigned int gic_irq_base;
unsigned int gic_irq_flags[GIC_NUM_INTRS];
-
-/* The index into this array is the vector # of the interrupt. */
-struct gic_shared_intr_map gic_shared_intr_map[GIC_NUM_INTRS];
+unsigned int gic_cpu_pin;

struct gic_pcpu_mask {
DECLARE_BITMAP(pcpu_mask, GIC_NUM_INTRS);
@@ -45,6 +44,8 @@ static struct gic_pending_regs pending_regs[NR_CPUS];
static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
static struct irq_domain *gic_irq_domain;

+static void __gic_irq_dispatch(void);
+
#if defined(CONFIG_CSRC_GIC) || defined(CONFIG_CEVT_GIC)
cycle_t gic_read_count(void)
{
@@ -116,21 +117,6 @@ void gic_send_ipi(unsigned int intr)
GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
}

-static void gic_eic_irq_dispatch(void)
-{
- unsigned int cause = read_c0_cause();
- int irq;
-
- irq = (cause & ST0_IM) >> STATUSB_IP2;
- if (irq == 0)
- irq = -1;
-
- if (irq >= 0)
- do_IRQ(gic_irq_base + irq);
- else
- spurious_interrupt();
-}
-
static void __init vpe_local_setup(unsigned int numvpes)
{
unsigned long timer_intr = GIC_INT_TMR;
@@ -165,16 +151,15 @@ static void __init vpe_local_setup(unsigned int numvpes)
GIC_MAP_TO_PIN_MSK | timer_intr);
if (cpu_has_veic) {
set_vi_handler(timer_intr + GIC_PIN_TO_VEC_OFFSET,
- gic_eic_irq_dispatch);
- gic_shared_intr_map[timer_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_TIMER_MSK;
+ __gic_irq_dispatch);
}

if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
GIC_MAP_TO_PIN_MSK | perf_intr);
if (cpu_has_veic) {
- set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET, gic_eic_irq_dispatch);
- gic_shared_intr_map[perf_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_PERFCNT_MSK;
+ set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET,
+ __gic_irq_dispatch);
}
}
}
@@ -345,64 +330,100 @@ static struct irq_chip gic_irq_controller = {
#endif
};

-static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
- unsigned int pin, unsigned int polarity, unsigned int trigtype,
- unsigned int flags)
+static void __gic_irq_dispatch(void)
{
- struct gic_shared_intr_map *map_ptr;
- int i;
-
- /* Setup Intr to Pin mapping */
- if (pin & GIC_MAP_TO_NMI_MSK) {
- int i;
+ unsigned int intr, virq;

- GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
- /* FIXME: hack to route NMI to all cpu's */
- for (i = 0; i < NR_CPUS; i += 32) {
- GICWRITE(GIC_REG_ADDR(SHARED,
- GIC_SH_MAP_TO_VPE_REG_OFF(intr, i)),
- 0xffffffff);
- }
- } else {
- GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
- GIC_MAP_TO_PIN_MSK | pin);
- /* Setup Intr to CPU mapping */
- GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
- if (cpu_has_veic) {
- set_vi_handler(pin + GIC_PIN_TO_VEC_OFFSET,
- gic_eic_irq_dispatch);
- map_ptr = &gic_shared_intr_map[pin + GIC_PIN_TO_VEC_OFFSET];
- if (map_ptr->num_shared_intr >= GIC_MAX_SHARED_INTR)
- BUG();
- map_ptr->intr_list[map_ptr->num_shared_intr++] = intr;
- }
+ while ((intr = gic_get_int()) != GIC_NUM_INTRS) {
+ virq = irq_linear_revmap(gic_irq_domain, intr);
+ do_IRQ(virq);
}
+}

- /* Setup Intr Polarity */
- GIC_SET_POLARITY(intr, polarity);
+static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+{
+ __gic_irq_dispatch();
+}
+
+#ifdef CONFIG_MIPS_GIC_IPI
+static int gic_resched_int_base;
+static int gic_call_int_base;
+
+unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
+{
+ return gic_resched_int_base + cpu;
+}

- /* Setup Intr Trigger Type */
- GIC_SET_TRIGGER(intr, trigtype);
+unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
+{
+ return gic_call_int_base + cpu;
+}

- /* Init Intr Masks */
- GIC_CLR_INTR_MASK(intr);
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
+{
+ scheduler_ipi();
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
+{
+ smp_call_function_interrupt();
+
+ return IRQ_HANDLED;
+}

- /* Initialise per-cpu Interrupt software masks */
+static struct irqaction irq_resched = {
+ .handler = ipi_resched_interrupt,
+ .flags = IRQF_PERCPU,
+ .name = "IPI resched"
+};
+
+static struct irqaction irq_call = {
+ .handler = ipi_call_interrupt,
+ .flags = IRQF_PERCPU,
+ .name = "IPI call"
+};
+
+static __init void gic_ipi_init_one(unsigned int intr, int cpu,
+ struct irqaction *action)
+{
+ int virq = irq_create_mapping(gic_irq_domain, intr);
+ int i;
+
+ GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
for (i = 0; i < NR_CPUS; i++)
clear_bit(intr, pcpu_masks[i].pcpu_mask);
set_bit(intr, pcpu_masks[cpu].pcpu_mask);

- if ((flags & GIC_FLAG_TRANSPARENT) && (cpu_has_veic == 0))
- GIC_SET_INTR_MASK(intr);
- if (trigtype == GIC_TRIG_EDGE)
- gic_irq_flags[intr] |= GIC_TRIG_EDGE;
+ irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
+
+ irq_set_handler(virq, handle_percpu_irq);
+ setup_irq(virq, action);
}

-static void __init gic_basic_init(int numintrs, int numvpes,
- struct gic_intr_map *intrmap, int mapsize)
+static __init void gic_ipi_init(void)
{
- unsigned int i, cpu;
- unsigned int pin_offset = 0;
+ int i;
+
+ /* Use last 2 * NR_CPUS interrupts as IPIs */
+ gic_resched_int_base = GIC_NUM_INTRS - nr_cpu_ids;
+ gic_call_int_base = gic_resched_int_base - nr_cpu_ids;
+
+ for (i = 0; i < nr_cpu_ids; i++) {
+ gic_ipi_init_one(gic_call_int_base + i, i, &irq_call);
+ gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched);
+ }
+}
+#else
+static inline void gic_ipi_init(void)
+{
+}
+#endif
+
+static void __init gic_basic_init(int numintrs, int numvpes)
+{
+ unsigned int i;

board_bind_eic_interrupt = &gic_bind_eic_interrupt;

@@ -411,31 +432,8 @@ static void __init gic_basic_init(int numintrs, int numvpes,
GIC_SET_POLARITY(i, GIC_POL_POS);
GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
GIC_CLR_INTR_MASK(i);
- if (i < GIC_NUM_INTRS) {
+ if (i < GIC_NUM_INTRS)
gic_irq_flags[i] = 0;
- gic_shared_intr_map[i].num_shared_intr = 0;
- gic_shared_intr_map[i].local_intr_mask = 0;
- }
- }
-
- /*
- * In EIC mode, the HW_INT# is offset by (2-1). Need to subtract
- * one because the GIC will add one (since 0=no intr).
- */
- if (cpu_has_veic)
- pin_offset = (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
-
- /* Setup specifics */
- for (i = 0; i < mapsize; i++) {
- cpu = intrmap[i].cpunum;
- if (cpu == GIC_UNUSED)
- continue;
- gic_setup_intr(i,
- intrmap[i].cpunum,
- intrmap[i].pin + pin_offset,
- intrmap[i].polarity,
- intrmap[i].trigtype,
- intrmap[i].flags);
}

vpe_local_setup(numvpes);
@@ -447,7 +445,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
irq_set_chip_and_handler(virq, &gic_irq_controller, handle_level_irq);

GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(hw)),
- GIC_MAP_TO_PIN_MSK | 0);
+ GIC_MAP_TO_PIN_MSK | gic_cpu_pin);
/* Map to VPE 0 by default */
GIC_SH_MAP_TO_VPE_SMASK(hw, 0);
set_bit(hw, pcpu_masks[0].pcpu_mask);
@@ -461,8 +459,7 @@ static struct irq_domain_ops gic_irq_domain_ops = {
};

void __init gic_init(unsigned long gic_base_addr,
- unsigned long gic_addrspace_size,
- struct gic_intr_map *intr_map, unsigned int intr_map_size,
+ unsigned long gic_addrspace_size, unsigned int cpu_vec,
unsigned int irqbase)
{
unsigned int gicconfig;
@@ -470,7 +467,6 @@ void __init gic_init(unsigned long gic_base_addr,

_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
gic_addrspace_size);
- gic_irq_base = irqbase;

GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
@@ -481,10 +477,23 @@ void __init gic_init(unsigned long gic_base_addr,
GIC_SH_CONFIG_NUMVPES_SHF;
numvpes = numvpes + 1;

+ if (cpu_has_veic) {
+ /* Always use vector 1 in EIC mode */
+ gic_cpu_pin = 0;
+ set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET,
+ __gic_irq_dispatch);
+ } else {
+ gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET;
+ irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec,
+ gic_irq_dispatch);
+ }
+
gic_irq_domain = irq_domain_add_simple(NULL, GIC_NUM_INTRS, irqbase,
&gic_irq_domain_ops, NULL);
if (!gic_irq_domain)
panic("Failed to add GIC IRQ domain");

- gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
+ gic_basic_init(numintrs, numvpes);
+
+ gic_ipi_init();
}
--
2.1.0.rc2.206.gedb03e5

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