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Subject[PATCH v3 07/10] MIPS: Loongson64: Drop legacy IRQ code
Date
We've made generic irqchip drivers for Loongson-3 platform, it's time
to say goodbye to these legacy code.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
.../include/asm/mach-loongson64/boot_param.h | 2 +
arch/mips/include/asm/mach-loongson64/irq.h | 29 ----
arch/mips/loongson64/Makefile | 2 +-
arch/mips/loongson64/init.c | 6 +
arch/mips/loongson64/irq.c | 162 ------------------
arch/mips/loongson64/smp.c | 28 ++-
6 files changed, 20 insertions(+), 209 deletions(-)
delete mode 100644 arch/mips/loongson64/irq.c

diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
index 8c286bedff3e..2ed483e32d8c 100644
--- a/arch/mips/include/asm/mach-loongson64/boot_param.h
+++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
@@ -2,6 +2,8 @@
#ifndef __ASM_MACH_LOONGSON64_BOOT_PARAM_H_
#define __ASM_MACH_LOONGSON64_BOOT_PARAM_H_

+#include <linux/types.h>
+
#define SYSTEM_RAM_LOW 1
#define SYSTEM_RAM_HIGH 2
#define SYSTEM_RAM_RESERVED 3
diff --git a/arch/mips/include/asm/mach-loongson64/irq.h b/arch/mips/include/asm/mach-loongson64/irq.h
index 73a89913dc38..12208119aac0 100644
--- a/arch/mips/include/asm/mach-loongson64/irq.h
+++ b/arch/mips/include/asm/mach-loongson64/irq.h
@@ -7,34 +7,5 @@
/* cpu core interrupt numbers */
#define MIPS_CPU_IRQ_BASE 56

-#define LOONGSON_UART_IRQ (MIPS_CPU_IRQ_BASE + 2) /* UART */
-#define LOONGSON_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 3) /* CASCADE */
-#define LOONGSON_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 7) /* CPU Timer */
-
-#define LOONGSON_HT1_CFG_BASE loongson_sysconf.ht_control_base
-#define LOONGSON_HT1_INT_VECTOR_BASE (LOONGSON_HT1_CFG_BASE + 0x80)
-#define LOONGSON_HT1_INT_EN_BASE (LOONGSON_HT1_CFG_BASE + 0xa0)
-#define LOONGSON_HT1_INT_VECTOR(n) \
- LOONGSON3_REG32(LOONGSON_HT1_INT_VECTOR_BASE, 4 * (n))
-#define LOONGSON_HT1_INTN_EN(n) \
- LOONGSON3_REG32(LOONGSON_HT1_INT_EN_BASE, 4 * (n))
-
-#define LOONGSON_INT_ROUTER_OFFSET 0x1400
-#define LOONGSON_INT_ROUTER_INTEN \
- LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x24)
-#define LOONGSON_INT_ROUTER_INTENSET \
- LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x28)
-#define LOONGSON_INT_ROUTER_INTENCLR \
- LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x2c)
-#define LOONGSON_INT_ROUTER_ENTRY(n) \
- LOONGSON3_REG8(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + n)
-#define LOONGSON_INT_ROUTER_LPC LOONGSON_INT_ROUTER_ENTRY(0x0a)
-#define LOONGSON_INT_ROUTER_HT1(n) LOONGSON_INT_ROUTER_ENTRY(n + 0x18)
-
-#define LOONGSON_INT_COREx_INTy(x, y) (1<<(x) | 1<<(y+4)) /* route to int y of core x */
-
-extern void fixup_irqs(void);
-extern void loongson3_ipi_interrupt(struct pt_regs *regs);
-
#include_next <irq.h>
#endif /* __ASM_MACH_LOONGSON64_IRQ_H_ */
diff --git a/arch/mips/loongson64/Makefile b/arch/mips/loongson64/Makefile
index 7821891bc5d0..b7f40b179c71 100644
--- a/arch/mips/loongson64/Makefile
+++ b/arch/mips/loongson64/Makefile
@@ -2,7 +2,7 @@
#
# Makefile for Loongson-3 family machines
#
-obj-$(CONFIG_MACH_LOONGSON64) += irq.o cop2-ex.o platform.o acpi_init.o dma.o \
+obj-$(CONFIG_MACH_LOONGSON64) += cop2-ex.o platform.o acpi_init.o dma.o \
setup.o init.o env.o time.o reset.o \

obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index 5ac1a0f35ca4..da38944471f4 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -4,6 +4,7 @@
* Author: Wu Zhangjin, wuzhangjin@gmail.com
*/

+#include <linux/irqchip.h>
#include <linux/memblock.h>
#include <asm/bootinfo.h>
#include <asm/traps.h>
@@ -44,3 +45,8 @@ void __init prom_init(void)
void __init prom_free_prom_memory(void)
{
}
+
+void __init arch_init_irq(void)
+{
+ irqchip_init();
+}
diff --git a/arch/mips/loongson64/irq.c b/arch/mips/loongson64/irq.c
deleted file mode 100644
index 79ad797497e4..000000000000
--- a/arch/mips/loongson64/irq.c
+++ /dev/null
@@ -1,162 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <loongson.h>
-#include <irq.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-
-#include <asm/irq_cpu.h>
-#include <asm/i8259.h>
-#include <asm/mipsregs.h>
-
-#include "smp.h"
-
-extern void loongson3_send_irq_by_ipi(int cpu, int irqs);
-
-unsigned int irq_cpu[16] = {[0 ... 15] = -1};
-unsigned int ht_irq[] = {0, 1, 3, 4, 5, 6, 7, 8, 12, 14, 15};
-unsigned int local_irq = 1<<0 | 1<<1 | 1<<2 | 1<<7 | 1<<8 | 1<<12;
-
-int plat_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
- bool force)
-{
- unsigned int cpu;
- struct cpumask new_affinity;
-
- /* I/O devices are connected on package-0 */
- cpumask_copy(&new_affinity, affinity);
- for_each_cpu(cpu, affinity)
- if (cpu_data[cpu].package > 0)
- cpumask_clear_cpu(cpu, &new_affinity);
-
- if (cpumask_empty(&new_affinity))
- return -EINVAL;
-
- cpumask_copy(d->common->affinity, &new_affinity);
-
- return IRQ_SET_MASK_OK_NOCOPY;
-}
-
-static void ht_irqdispatch(void)
-{
- unsigned int i, irq;
- struct irq_data *irqd;
- struct cpumask affinity;
-
- irq = LOONGSON_HT1_INT_VECTOR(0);
- LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */
-
- for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
- if (!(irq & (0x1 << ht_irq[i])))
- continue;
-
- /* handled by local core */
- if (local_irq & (0x1 << ht_irq[i])) {
- do_IRQ(ht_irq[i]);
- continue;
- }
-
- irqd = irq_get_irq_data(ht_irq[i]);
- cpumask_and(&affinity, irqd->common->affinity, cpu_active_mask);
- if (cpumask_empty(&affinity)) {
- do_IRQ(ht_irq[i]);
- continue;
- }
-
- irq_cpu[ht_irq[i]] = cpumask_next(irq_cpu[ht_irq[i]], &affinity);
- if (irq_cpu[ht_irq[i]] >= nr_cpu_ids)
- irq_cpu[ht_irq[i]] = cpumask_first(&affinity);
-
- if (irq_cpu[ht_irq[i]] == 0) {
- do_IRQ(ht_irq[i]);
- continue;
- }
-
- /* balanced by other cores */
- loongson3_send_irq_by_ipi(irq_cpu[ht_irq[i]], (0x1 << ht_irq[i]));
- }
-}
-
-#define UNUSED_IPS (CAUSEF_IP5 | CAUSEF_IP4 | CAUSEF_IP1 | CAUSEF_IP0)
-
-asmlinkage void plat_irq_dispatch(void)
-{
- unsigned int pending;
-
- pending = read_c0_cause() & read_c0_status() & ST0_IM;
-
- if (pending & CAUSEF_IP7)
- do_IRQ(LOONGSON_TIMER_IRQ);
-#if defined(CONFIG_SMP)
- if (pending & CAUSEF_IP6)
- loongson3_ipi_interrupt(NULL);
-#endif
- if (pending & CAUSEF_IP3)
- ht_irqdispatch();
- if (pending & CAUSEF_IP2)
- do_IRQ(LOONGSON_UART_IRQ);
- if (pending & UNUSED_IPS) {
- pr_err("%s : spurious interrupt\n", __func__);
- spurious_interrupt();
- }
-}
-
-static inline void mask_loongson_irq(struct irq_data *d) { }
-static inline void unmask_loongson_irq(struct irq_data *d) { }
-
- /* For MIPS IRQs which shared by all cores */
-static struct irq_chip loongson_irq_chip = {
- .name = "Loongson",
- .irq_ack = mask_loongson_irq,
- .irq_mask = mask_loongson_irq,
- .irq_mask_ack = mask_loongson_irq,
- .irq_unmask = unmask_loongson_irq,
- .irq_eoi = unmask_loongson_irq,
-};
-
-void irq_router_init(void)
-{
- int i;
-
- /* route LPC int to cpu core0 int 0 */
- LOONGSON_INT_ROUTER_LPC =
- LOONGSON_INT_COREx_INTy(loongson_sysconf.boot_cpu_id, 0);
- /* route HT1 int0 ~ int7 to cpu core0 INT1*/
- for (i = 0; i < 8; i++)
- LOONGSON_INT_ROUTER_HT1(i) =
- LOONGSON_INT_COREx_INTy(loongson_sysconf.boot_cpu_id, 1);
- /* enable HT1 interrupt */
- LOONGSON_HT1_INTN_EN(0) = 0xffffffff;
- /* enable router interrupt intenset */
- LOONGSON_INT_ROUTER_INTENSET =
- LOONGSON_INT_ROUTER_INTEN | (0xffff << 16) | 0x1 << 10;
-}
-
-void __init arch_init_irq(void)
-{
- struct irq_chip *chip;
-
- clear_c0_status(ST0_IM | ST0_BEV);
-
- irq_router_init();
- mips_cpu_irq_init();
- init_i8259_irqs();
- chip = irq_get_chip(I8259A_IRQ_BASE);
- chip->irq_set_affinity = plat_set_irq_affinity;
-
- irq_set_chip_and_handler(LOONGSON_UART_IRQ,
- &loongson_irq_chip, handle_percpu_irq);
- irq_set_chip_and_handler(LOONGSON_BRIDGE_IRQ,
- &loongson_irq_chip, handle_percpu_irq);
-
- set_c0_status(STATUSF_IP2 | STATUSF_IP3 | STATUSF_IP6);
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-
-void fixup_irqs(void)
-{
- irq_cpu_offline();
- clear_c0_status(ST0_IM);
-}
-
-#endif
diff --git a/arch/mips/loongson64/smp.c b/arch/mips/loongson64/smp.c
index de8e0741ce2d..e1fe8bbb377d 100644
--- a/arch/mips/loongson64/smp.c
+++ b/arch/mips/loongson64/smp.c
@@ -4,6 +4,7 @@
* Author: Chen Huacai, chenhc@lemote.com
*/

+#include <irq.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/sched.h>
@@ -25,6 +26,8 @@

DEFINE_PER_CPU(int, cpu_state);

+#define LS_IPI_IRQ (MIPS_CPU_IRQ_BASE + 6)
+
static void *ipi_set0_regs[16];
static void *ipi_clear0_regs[16];
static void *ipi_status0_regs[16];
@@ -302,20 +305,13 @@ loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
ipi_write_action(cpu_logical_map(i), (u32)action);
}

-#define IPI_IRQ_OFFSET 6
-
-void loongson3_send_irq_by_ipi(int cpu, int irqs)
-{
- ipi_write_action(cpu_logical_map(cpu), irqs << IPI_IRQ_OFFSET);
-}

-void loongson3_ipi_interrupt(struct pt_regs *regs)
+static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id)
{
int i, cpu = smp_processor_id();
- unsigned int action, c0count, irqs;
+ unsigned int action, c0count;

action = ipi_read_clear(cpu);
- irqs = action >> IPI_IRQ_OFFSET;

if (action & SMP_RESCHEDULE_YOURSELF)
scheduler_ipi();
@@ -335,13 +331,7 @@ void loongson3_ipi_interrupt(struct pt_regs *regs)
__wbflush(); /* Let others see the result ASAP */
}

- if (irqs) {
- int irq;
- while ((irq = ffs(irqs))) {
- do_IRQ(irq-1);
- irqs &= ~(1<<(irq-1));
- }
- }
+ return IRQ_HANDLED;
}

#define MAX_LOOPS 800
@@ -438,6 +428,9 @@ static void __init loongson3_smp_setup(void)

static void __init loongson3_prepare_cpus(unsigned int max_cpus)
{
+ if (request_irq(LS_IPI_IRQ, loongson3_ipi_interrupt,
+ IRQF_PERCPU | IRQF_NO_SUSPEND, "SMP_IPI", NULL))
+ pr_err("Failed to request IPI IRQ\n");
init_cpu_present(cpu_possible_mask);
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
}
@@ -484,7 +477,8 @@ static int loongson3_cpu_disable(void)
set_cpu_online(cpu, false);
calculate_cpu_foreign_map();
local_irq_save(flags);
- fixup_irqs();
+ irq_cpu_offline();
+ clear_c0_status(ST0_IM);
local_irq_restore(flags);
local_flush_tlb_all();

--
2.24.1
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