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-rw-r--r--arch/mips/Kconfig1
-rw-r--r--arch/mips/boot/dts/mti/malta.dts41
-rw-r--r--arch/mips/mti-malta/malta-dtshim.c77
-rw-r--r--arch/mips/mti-malta/malta-int.c96
4 files changed, 124 insertions, 91 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7ec9ed7ab67b..400cd3695ecc 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -479,6 +479,7 @@ config MIPS_MALTA
select SYS_SUPPORTS_ZBOOT
select SYS_SUPPORTS_RELOCATABLE
select USE_OF
+ select LIBFDT
select ZONE_DMA32 if 64BIT
select BUILTIN_DTB
select LIBFDT
diff --git a/arch/mips/boot/dts/mti/malta.dts b/arch/mips/boot/dts/mti/malta.dts
index b18c46637d21..af765afce825 100644
--- a/arch/mips/boot/dts/mti/malta.dts
+++ b/arch/mips/boot/dts/mti/malta.dts
@@ -1,5 +1,8 @@
/dts-v1/;
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/mips-gic.h>
+
/memreserve/ 0x00000000 0x00001000; /* YAMON exception vectors */
/memreserve/ 0x00001000 0x000ef000; /* YAMON */
/memreserve/ 0x000f0000 0x00010000; /* PIIX4 ISA memory */
@@ -8,4 +11,42 @@
#address-cells = <1>;
#size-cells = <1>;
compatible = "mti,malta";
+
+ cpu_intc: interrupt-controller {
+ compatible = "mti,cpu-interrupt-controller";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ };
+
+ gic: interrupt-controller@1bdc0000 {
+ compatible = "mti,gic";
+ reg = <0x1bdc0000 0x20000>;
+
+ interrupt-controller;
+ #interrupt-cells = <3>;
+
+ /*
+ * Declare the interrupt-parent even though the mti,gic
+ * binding doesn't require it, such that the kernel can
+ * figure out that cpu_intc is the root interrupt
+ * controller & should be probed first.
+ */
+ interrupt-parent = <&cpu_intc>;
+
+ timer {
+ compatible = "mti,gic-timer";
+ interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
+ };
+ };
+
+ i8259: interrupt-controller@20 {
+ compatible = "intel,i8259";
+
+ interrupt-controller;
+ #interrupt-cells = <1>;
+
+ interrupt-parent = <&gic>;
+ interrupts = <GIC_SHARED 3 IRQ_TYPE_LEVEL_HIGH>;
+ };
};
diff --git a/arch/mips/mti-malta/malta-dtshim.c b/arch/mips/mti-malta/malta-dtshim.c
index bdda3cb66668..c398582c316f 100644
--- a/arch/mips/mti-malta/malta-dtshim.c
+++ b/arch/mips/mti-malta/malta-dtshim.c
@@ -17,6 +17,8 @@
#include <asm/bootinfo.h>
#include <asm/fw/fw.h>
#include <asm/mips-boards/generic.h>
+#include <asm/mips-boards/malta.h>
+#include <asm/mips-cm.h>
#include <asm/page.h>
#define ROCIT_REG_BASE 0x1f403000
@@ -226,6 +228,80 @@ static void __init append_memory(void *fdt, int root_off)
panic("Unable to set linux,usable-memory property: %d", err);
}
+static void __init remove_gic(void *fdt)
+{
+ int err, gic_off, i8259_off, cpu_off;
+ void __iomem *biu_base;
+ uint32_t cpu_phandle, sc_cfg;
+
+ /* if we have a CM which reports a GIC is present, leave the DT alone */
+ err = mips_cm_probe();
+ if (!err && (read_gcr_gic_status() & CM_GCR_GIC_STATUS_GICEX_MSK))
+ return;
+
+ if (malta_scon() == MIPS_REVISION_SCON_ROCIT) {
+ /*
+ * On systems using the RocIT system controller a GIC may be
+ * present without a CM. Detect whether that is the case.
+ */
+ biu_base = ioremap_nocache(MSC01_BIU_REG_BASE,
+ MSC01_BIU_ADDRSPACE_SZ);
+ sc_cfg = __raw_readl(biu_base + MSC01_SC_CFG_OFS);
+ if (sc_cfg & MSC01_SC_CFG_GICPRES_MSK) {
+ /* enable the GIC at the system controller level */
+ sc_cfg |= BIT(MSC01_SC_CFG_GICENA_SHF);
+ __raw_writel(sc_cfg, biu_base + MSC01_SC_CFG_OFS);
+ return;
+ }
+ }
+
+ gic_off = fdt_node_offset_by_compatible(fdt, -1, "mti,gic");
+ if (gic_off < 0) {
+ pr_warn("malta-dtshim: unable to find DT GIC node: %d\n",
+ gic_off);
+ return;
+ }
+
+ err = fdt_nop_node(fdt, gic_off);
+ if (err)
+ pr_warn("malta-dtshim: unable to nop GIC node\n");
+
+ i8259_off = fdt_node_offset_by_compatible(fdt, -1, "intel,i8259");
+ if (i8259_off < 0) {
+ pr_warn("malta-dtshim: unable to find DT i8259 node: %d\n",
+ i8259_off);
+ return;
+ }
+
+ cpu_off = fdt_node_offset_by_compatible(fdt, -1,
+ "mti,cpu-interrupt-controller");
+ if (cpu_off < 0) {
+ pr_warn("malta-dtshim: unable to find CPU intc node: %d\n",
+ cpu_off);
+ return;
+ }
+
+ cpu_phandle = fdt_get_phandle(fdt, cpu_off);
+ if (!cpu_phandle) {
+ pr_warn("malta-dtshim: unable to get CPU intc phandle\n");
+ return;
+ }
+
+ err = fdt_setprop_u32(fdt, i8259_off, "interrupt-parent", cpu_phandle);
+ if (err) {
+ pr_warn("malta-dtshim: unable to set i8259 interrupt-parent: %d\n",
+ err);
+ return;
+ }
+
+ err = fdt_setprop_u32(fdt, i8259_off, "interrupts", 2);
+ if (err) {
+ pr_warn("malta-dtshim: unable to set i8259 interrupts: %d\n",
+ err);
+ return;
+ }
+}
+
void __init *malta_dt_shim(void *fdt)
{
int root_off, len, err;
@@ -251,6 +327,7 @@ void __init *malta_dt_shim(void *fdt)
return fdt;
append_memory(fdt_buf, root_off);
+ remove_gic(fdt_buf);
err = fdt_pack(fdt_buf);
if (err)
diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
index c6a6c7afddab..9f83224292d9 100644
--- a/arch/mips/mti-malta/malta-int.c
+++ b/arch/mips/mti-malta/malta-int.c
@@ -14,11 +14,13 @@
*/
#include <linux/init.h>
#include <linux/irq.h>
+#include <linux/irqchip.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqchip/mips-gic.h>
+#include <linux/of_irq.h>
#include <linux/kernel_stat.h>
#include <linux/kernel.h>
#include <linux/random.h>
@@ -37,10 +39,6 @@
#include <asm/setup.h>
#include <asm/rtlx.h>
-static void __iomem *_msc01_biu_base;
-
-static DEFINE_RAW_SPINLOCK(mips_irq_lock);
-
static inline int mips_pcibios_iack(void)
{
int irq;
@@ -85,49 +83,6 @@ static inline int mips_pcibios_iack(void)
return irq;
}
-static inline int get_int(void)
-{
- unsigned long flags;
- int irq;
- raw_spin_lock_irqsave(&mips_irq_lock, flags);
-
- irq = mips_pcibios_iack();
-
- /*
- * The only way we can decide if an interrupt is spurious
- * is by checking the 8259 registers. This needs a spinlock
- * on an SMP system, so leave it up to the generic code...
- */
-
- raw_spin_unlock_irqrestore(&mips_irq_lock, flags);
-
- return irq;
-}
-
-static void malta_hw0_irqdispatch(void)
-{
- int irq;
-
- irq = get_int();
- if (irq < 0) {
- /* interrupt has already been cleared */
- return;
- }
-
- do_IRQ(MALTA_INT_BASE + irq);
-
-#ifdef CONFIG_MIPS_VPE_APSP_API_MT
- if (aprp_hook)
- aprp_hook();
-#endif
-}
-
-static irqreturn_t i8259_handler(int irq, void *dev_id)
-{
- malta_hw0_irqdispatch();
- return IRQ_HANDLED;
-}
-
static void corehi_irqdispatch(void)
{
unsigned int intedge, intsteer, pcicmd, pcibadaddr;
@@ -240,12 +195,6 @@ static struct irqaction irq_call = {
};
#endif /* CONFIG_MIPS_MT_SMP */
-static struct irqaction i8259irq = {
- .handler = i8259_handler,
- .name = "XT-PIC cascade",
- .flags = IRQF_NO_THREAD,
-};
-
static struct irqaction corehi_irqaction = {
.handler = corehi_handler,
.name = "CoreHi",
@@ -281,28 +230,10 @@ void __init arch_init_ipiirq(int irq, struct irqaction *action)
void __init arch_init_irq(void)
{
- int corehi_irq, i8259_irq;
+ int corehi_irq;
- init_i8259_irqs();
-
- if (!cpu_has_veic)
- mips_cpu_irq_init();
-
- if (mips_cm_present()) {
- write_gcr_gic_base(GIC_BASE_ADDR | CM_GCR_GIC_BASE_GICEN_MSK);
- gic_present = 1;
- } else {
- if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
- _msc01_biu_base = ioremap_nocache(MSC01_BIU_REG_BASE,
- MSC01_BIU_ADDRSPACE_SZ);
- gic_present =
- (__raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS) &
- MSC01_SC_CFG_GICPRES_MSK) >>
- MSC01_SC_CFG_GICPRES_SHF;
- }
- }
- if (gic_present)
- pr_debug("GIC present\n");
+ i8259_set_poll(mips_pcibios_iack);
+ irqchip_init();
switch (mips_revision_sconid) {
case MIPS_REVISION_SCON_SOCIT:
@@ -330,18 +261,6 @@ void __init arch_init_irq(void)
}
if (gic_present) {
- int i;
-
- gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, MIPSCPU_INT_GIC,
- MIPS_GIC_IRQ_BASE);
- if (!mips_cm_present()) {
- /* Enable the GIC */
- i = __raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS);
- __raw_writel(i | (0x1 << MSC01_SC_CFG_GICENA_SHF),
- _msc01_biu_base + MSC01_SC_CFG_OFS);
- pr_debug("GIC Enabled\n");
- }
- 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)
@@ -361,19 +280,14 @@ void __init arch_init_irq(void)
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);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 18:52:22 +0000