[PATCH 0/6] Introduce SMP support for JZ4780.

[PATCH 0/6] Introduce SMP support for JZ4780.

[周琰杰 (Zhou Yanjie)]

Introduce SMP support for MIPS Creator CI20, which is
based on Ingenic JZ4780 SoC.

周琰杰 (Zhou Yanjie) (6):
  MIPS: JZ4780: Introduce SMP support.
  clocksource: Ingenic: Add high resolution timer support for SMP.
  dt-bindings: MIPS: Document Ingenic SoCs binding.
  MIPS: Ingenic: Add 'cpus' node for Ingenic SoCs.
  MIPS: CI20: Modify DTS to support high resolution timer for SMP.
  MIPS: CI20: Update defconfig to support SMP.

 .../bindings/mips/ingenic/ingenic,cpu.txt          |  32 +++
 .../bindings/mips/ingenic/ingenic,soc,txt          |  18 ++
 arch/mips/boot/dts/ingenic/ci20.dts                |  11 +-
 arch/mips/boot/dts/ingenic/jz4740.dtsi             |  14 +
 arch/mips/boot/dts/ingenic/jz4770.dtsi             |  15 +-
 arch/mips/boot/dts/ingenic/jz4780.dtsi             |  23 ++
 arch/mips/boot/dts/ingenic/x1000.dtsi              |  14 +
 arch/mips/configs/ci20_defconfig                   |   2 +
 arch/mips/include/asm/mach-jz4740/jz4780-smp.h     |  91 +++++++
 arch/mips/jz4740/Kconfig                           |   3 +
 arch/mips/jz4740/Makefile                          |   5 +
 arch/mips/jz4740/prom.c                            |   4 +
 arch/mips/jz4740/smp-entry.S                       |  57 ++++
 arch/mips/jz4740/smp.c                             | 300 +++++++++++++++++++++
 arch/mips/kernel/idle.c                            |  14 +-
 drivers/clocksource/ingenic-timer.c                | 114 ++++++--
 drivers/irqchip/irq-ingenic.c                      |  21 ++
 17 files changed, 713 insertions(+), 25 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
 create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt
 create mode 100644 arch/mips/include/asm/mach-jz4740/jz4780-smp.h
 create mode 100644 arch/mips/jz4740/smp-entry.S
 create mode 100644 arch/mips/jz4740/smp.c

-- 
2.7.4

[PATCH 1/6] MIPS: JZ4780: Introduce SMP support.

[周琰杰 (Zhou Yanjie)]

Forward port smp support from kernel 3.18.3 of CI20_linux
to upstream kernel 5.5.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 arch/mips/include/asm/mach-jz4740/jz4780-smp.h |  91 ++++++++
 arch/mips/jz4740/Kconfig                       |   3 +
 arch/mips/jz4740/Makefile                      |   5 +
 arch/mips/jz4740/prom.c                        |   4 +
 arch/mips/jz4740/smp-entry.S                   |  57 +++++
 arch/mips/jz4740/smp.c                         | 300 +++++++++++++++++++++++++
 arch/mips/kernel/idle.c                        |  14 +-
 drivers/irqchip/irq-ingenic.c                  |  21 ++
 8 files changed, 494 insertions(+), 1 deletion(-)
 create mode 100644 arch/mips/include/asm/mach-jz4740/jz4780-smp.h
 create mode 100644 arch/mips/jz4740/smp-entry.S
 create mode 100644 arch/mips/jz4740/smp.c

diff --git a/arch/mips/include/asm/mach-jz4740/jz4780-smp.h b/arch/mips/include/asm/mach-jz4740/jz4780-smp.h
new file mode 100644
index 00000000..3f592ce
--- /dev/null
+++ b/arch/mips/include/asm/mach-jz4740/jz4780-smp.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  Copyright (C) 2013, Paul Burton <paul.burton@imgtec.com>
+ *  JZ4780 SMP definitions
+ */
+
+#ifndef __MIPS_ASM_MACH_JZ4740_JZ4780_SMP_H__
+#define __MIPS_ASM_MACH_JZ4740_JZ4780_SMP_H__
+
+#define read_c0_corectrl()		__read_32bit_c0_register($12, 2)
+#define write_c0_corectrl(val)		__write_32bit_c0_register($12, 2, val)
+
+#define read_c0_corestatus()		__read_32bit_c0_register($12, 3)
+#define write_c0_corestatus(val)	__write_32bit_c0_register($12, 3, val)
+
+#define read_c0_reim()			__read_32bit_c0_register($12, 4)
+#define write_c0_reim(val)		__write_32bit_c0_register($12, 4, val)
+
+#define read_c0_mailbox0()		__read_32bit_c0_register($20, 0)
+#define write_c0_mailbox0(val)		__write_32bit_c0_register($20, 0, val)
+
+#define read_c0_mailbox1()		__read_32bit_c0_register($20, 1)
+#define write_c0_mailbox1(val)		__write_32bit_c0_register($20, 1, val)
+
+#define smp_clr_pending(mask) do {		\
+		unsigned int stat;		\
+		stat = read_c0_corestatus();	\
+		stat &= ~((mask) & 0xff);	\
+		write_c0_corestatus(stat);	\
+	} while (0)
+
+/*
+ * Core Control register
+ */
+#define CORECTRL_SLEEP1M_SHIFT	17
+#define CORECTRL_SLEEP1M	(_ULCAST_(0x1) << CORECTRL_SLEEP1M_SHIFT)
+#define CORECTRL_SLEEP0M_SHIFT	16
+#define CORECTRL_SLEEP0M	(_ULCAST_(0x1) << CORECTRL_SLEEP0M_SHIFT)
+#define CORECTRL_RPC1_SHIFT	9
+#define CORECTRL_RPC1		(_ULCAST_(0x1) << CORECTRL_RPC1_SHIFT)
+#define CORECTRL_RPC0_SHIFT	8
+#define CORECTRL_RPC0		(_ULCAST_(0x1) << CORECTRL_RPC0_SHIFT)
+#define CORECTRL_SWRST1_SHIFT	1
+#define CORECTRL_SWRST1		(_ULCAST_(0x1) << CORECTRL_SWRST1_SHIFT)
+#define CORECTRL_SWRST0_SHIFT	0
+#define CORECTRL_SWRST0		(_ULCAST_(0x1) << CORECTRL_SWRST0_SHIFT)
+
+/*
+ * Core Status register
+ */
+#define CORESTATUS_SLEEP1_SHIFT	17
+#define CORESTATUS_SLEEP1	(_ULCAST_(0x1) << CORESTATUS_SLEEP1_SHIFT)
+#define CORESTATUS_SLEEP0_SHIFT	16
+#define CORESTATUS_SLEEP0	(_ULCAST_(0x1) << CORESTATUS_SLEEP0_SHIFT)
+#define CORESTATUS_IRQ1P_SHIFT	9
+#define CORESTATUS_IRQ1P	(_ULCAST_(0x1) << CORESTATUS_IRQ1P_SHIFT)
+#define CORESTATUS_IRQ0P_SHIFT	8
+#define CORESTATUS_IRQ0P	(_ULCAST_(0x1) << CORESTATUS_IRQ8P_SHIFT)
+#define CORESTATUS_MIRQ1P_SHIFT	1
+#define CORESTATUS_MIRQ1P	(_ULCAST_(0x1) << CORESTATUS_MIRQ1P_SHIFT)
+#define CORESTATUS_MIRQ0P_SHIFT	0
+#define CORESTATUS_MIRQ0P	(_ULCAST_(0x1) << CORESTATUS_MIRQ0P_SHIFT)
+
+/*
+ * Reset Entry & IRQ Mask register
+ */
+#define REIM_ENTRY_SHIFT	16
+#define REIM_ENTRY		(_ULCAST_(0xffff) << REIM_ENTRY_SHIFT)
+#define REIM_IRQ1M_SHIFT	9
+#define REIM_IRQ1M		(_ULCAST_(0x1) << REIM_IRQ1M_SHIFT)
+#define REIM_IRQ0M_SHIFT	8
+#define REIM_IRQ0M		(_ULCAST_(0x1) << REIM_IRQ0M_SHIFT)
+#define REIM_MBOXIRQ1M_SHIFT	1
+#define REIM_MBOXIRQ1M		(_ULCAST_(0x1) << REIM_MBOXIRQ1M_SHIFT)
+#define REIM_MBOXIRQ0M_SHIFT	0
+#define REIM_MBOXIRQ0M		(_ULCAST_(0x1) << REIM_MBOXIRQ0M_SHIFT)
+
+#ifdef CONFIG_SMP
+
+extern void jz4780_smp_wait_irqoff(void);
+
+extern void jz4780_smp_init(void);
+extern void jz4780_secondary_cpu_entry(void);
+
+#else /* !CONFIG_SMP */
+
+static inline void jz4780_smp_init(void) { }
+
+#endif /* !CONFIG_SMP */
+
+#endif /* __MIPS_ASM_MACH_JZ4740_JZ4780_SMP_H__ */
diff --git a/arch/mips/jz4740/Kconfig b/arch/mips/jz4740/Kconfig
index 412d2fa..0239597 100644
--- a/arch/mips/jz4740/Kconfig
+++ b/arch/mips/jz4740/Kconfig
@@ -34,9 +34,12 @@ config MACH_JZ4770
 
 config MACH_JZ4780
 	bool
+	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select MIPS_CPU_SCACHE
+	select NR_CPUS_DEFAULT_2
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_SUPPORTS_HIGHMEM
+	select SYS_SUPPORTS_SMP
 
 config MACH_X1000
 	bool
diff --git a/arch/mips/jz4740/Makefile b/arch/mips/jz4740/Makefile
index 6de14c0..0a0f024 100644
--- a/arch/mips/jz4740/Makefile
+++ b/arch/mips/jz4740/Makefile
@@ -12,3 +12,8 @@ CFLAGS_setup.o = -I$(src)/../../../scripts/dtc/libfdt
 # PM support
 
 obj-$(CONFIG_PM) += pm.o
+
+# SMP support
+
+obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_SMP) += smp-entry.o
diff --git a/arch/mips/jz4740/prom.c b/arch/mips/jz4740/prom.c
index ff4555c..a79159e 100644
--- a/arch/mips/jz4740/prom.c
+++ b/arch/mips/jz4740/prom.c
@@ -8,10 +8,14 @@
 
 #include <asm/bootinfo.h>
 #include <asm/fw/fw.h>
+#include <asm/mach-jz4740/jz4780-smp.h>
 
 void __init prom_init(void)
 {
 	fw_init_cmdline();
+#if defined(CONFIG_MACH_JZ4780) && defined(CONFIG_SMP)
+	jz4780_smp_init();
+#endif
 }
 
 void __init prom_free_prom_memory(void)
diff --git a/arch/mips/jz4740/smp-entry.S b/arch/mips/jz4740/smp-entry.S
new file mode 100644
index 00000000..20049a3
--- /dev/null
+++ b/arch/mips/jz4740/smp-entry.S
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  Copyright (C) 2013, Paul Burton <paul.burton@imgtec.com>
+ *  JZ4780 SMP entry point
+ */
+
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/cacheops.h>
+#include <asm/mipsregs.h>
+
+#define CACHE_SIZE (32 * 1024)
+#define CACHE_LINESIZE 32
+
+.extern jz4780_cpu_entry_sp
+.extern jz4780_cpu_entry_gp
+
+.section .text.smp-entry
+.balign 0x10000
+.set noreorder
+LEAF(jz4780_secondary_cpu_entry)
+	mtc0	zero, CP0_CAUSE
+
+	li	t0, ST0_CU0
+	mtc0	t0, CP0_STATUS
+
+	/* cache setup */
+	li	t0, KSEG0
+	ori	t1, t0, CACHE_SIZE
+	mtc0	zero, CP0_TAGLO, 0
+1:	cache	Index_Store_Tag_I, 0(t0)
+	cache	Index_Store_Tag_D, 0(t0)
+	bne	t0, t1, 1b
+	 addiu	t0, t0, CACHE_LINESIZE
+
+	/* kseg0 cache attribute */
+	mfc0	t0, CP0_CONFIG, 0
+	ori	t0, t0, CONF_CM_CACHABLE_NONCOHERENT
+	mtc0	t0, CP0_CONFIG, 0
+
+	/* pagemask */
+	mtc0	zero, CP0_PAGEMASK, 0
+
+	/* retrieve sp */
+	la	t0, jz4780_cpu_entry_sp
+	lw	sp, 0(t0)
+
+	/* retrieve gp */
+	la	t0, jz4780_cpu_entry_gp
+	lw	gp, 0(t0)
+
+	/* jump to the kernel in kseg0 */
+	la	t0, smp_bootstrap
+	jr	t0
+	 nop
+	END(jz4780_secondary_cpu_entry)
diff --git a/arch/mips/jz4740/smp.c b/arch/mips/jz4740/smp.c
new file mode 100644
index 00000000..d36e0b2
--- /dev/null
+++ b/arch/mips/jz4740/smp.c
@@ -0,0 +1,300 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2013, Paul Burton <paul.burton@imgtec.com>
+ *  JZ4780 SMP
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/smp.h>
+#include <linux/tick.h>
+#include <asm/mach-jz4740/jz4780-smp.h>
+#include <asm/r4kcache.h>
+#include <asm/smp-ops.h>
+
+static struct clk *cpu_clock_gates[CONFIG_NR_CPUS] = { NULL };
+
+u32 jz4780_cpu_entry_sp;
+u32 jz4780_cpu_entry_gp;
+
+static struct cpumask cpu_running;
+
+static DEFINE_SPINLOCK(smp_lock);
+
+extern void (*r4k_blast_dcache)(void);
+
+/*
+ * The Ingenic jz4780 SMP variant has to write back dirty cache lines before
+ * executing wait. The CPU & cache clock will be gated until we return from
+ * the wait, and if another core attempts to access data from our data cache
+ * during this time then it will lock up.
+ */
+void jz4780_smp_wait_irqoff(void)
+{
+	unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
+
+	/*
+	 * Going to idle has a significant overhead due to the cache flush so
+	 * try to avoid it if we'll immediately be woken again due to an IRQ.
+	 */
+	if (!need_resched() && !pending) {
+		r4k_blast_dcache();
+
+		__asm__(
+		"	.set push	\n"
+		"	.set mips3	\n"
+		"	sync		\n"
+		"	wait		\n"
+		"	.set pop	\n");
+	}
+
+	local_irq_enable();
+}
+
+static irqreturn_t mbox_handler(int irq, void *dev_id)
+{
+	int cpu = smp_processor_id();
+	u32 action, status;
+
+	spin_lock(&smp_lock);
+
+	switch (cpu) {
+	case 0:
+		action = read_c0_mailbox0();
+		write_c0_mailbox0(0);
+		break;
+	case 1:
+		action = read_c0_mailbox1();
+		write_c0_mailbox1(0);
+		break;
+	default:
+		panic("unhandled cpu %d!", cpu);
+	}
+
+	/* clear pending mailbox interrupt */
+	status = read_c0_corestatus();
+	status &= ~(CORESTATUS_MIRQ0P << cpu);
+	write_c0_corestatus(status);
+
+	spin_unlock(&smp_lock);
+
+	if (action & SMP_RESCHEDULE_YOURSELF)
+		scheduler_ipi();
+	if (action & SMP_CALL_FUNCTION)
+		generic_smp_call_function_interrupt();
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction mbox_action = {
+	.handler = mbox_handler,
+	.name = "core mailbox",
+	.flags = IRQF_PERCPU | IRQF_NO_THREAD,
+};
+
+static void jz4780_smp_setup(void)
+{
+	u32 addr, reim;
+	int cpu;
+
+	reim = read_c0_reim();
+
+	for (cpu = 0; cpu < NR_CPUS; cpu++) {
+		__cpu_number_map[cpu] = cpu;
+		__cpu_logical_map[cpu] = cpu;
+		set_cpu_possible(cpu, true);
+	}
+
+	/* mask mailbox interrupts for this core */
+	reim &= ~REIM_MBOXIRQ0M;
+	write_c0_reim(reim);
+
+	/* clear mailboxes & pending mailbox IRQs */
+	write_c0_mailbox0(0);
+	write_c0_mailbox1(0);
+	write_c0_corestatus(0);
+
+	/* set reset entry point */
+	addr = KSEG1ADDR((u32)&jz4780_secondary_cpu_entry);
+	WARN_ON(addr & ~REIM_ENTRY);
+	reim &= ~REIM_ENTRY;
+	reim |= addr & REIM_ENTRY;
+
+	/* unmask mailbox interrupts for this core */
+	reim |= REIM_MBOXIRQ0M;
+	write_c0_reim(reim);
+	set_c0_status(STATUSF_IP3);
+	irq_enable_hazard();
+
+	cpumask_set_cpu(cpu, &cpu_running);
+}
+
+static void jz4780_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *cpu_node;
+	unsigned cpu, ctrl;
+	int err;
+
+	/* setup the mailbox IRQ */
+	setup_irq(MIPS_CPU_IRQ_BASE + 3, &mbox_action);
+
+	init_cpu_present(cpu_possible_mask);
+
+	ctrl = read_c0_corectrl();
+
+	for (cpu = 0; cpu < max_cpus; cpu++) {
+		/* use reset entry point from REIM register */
+		ctrl |= CORECTRL_RPC0 << cpu;
+	}
+
+	for_each_compatible_node(cpu_node, NULL, "ingenic,xburst") {
+		err = of_property_read_u32_index(cpu_node, "reg", 0, &cpu);
+		if (err) {
+			pr_err("Failed to read index of %s\n",
+			       cpu_node->full_name);
+			continue;
+		}
+
+		cpu_clock_gates[cpu] = of_clk_get(cpu_node, 0);
+		if (IS_ERR(cpu_clock_gates[cpu])) {
+			cpu_clock_gates[cpu] = NULL;
+			continue;
+		}
+
+		err = clk_prepare(cpu_clock_gates[cpu]);
+		if (err)
+			pr_err("Failed to prepare CPU clock gate\n");
+	}
+
+	write_c0_corectrl(ctrl);
+}
+
+static int jz4780_boot_secondary(int cpu, struct task_struct *idle)
+{
+	unsigned long flags;
+	u32 ctrl;
+
+	spin_lock_irqsave(&smp_lock, flags);
+
+	/* ensure the core is in reset */
+	ctrl = read_c0_corectrl();
+	ctrl |= CORECTRL_SWRST0 << cpu;
+	write_c0_corectrl(ctrl);
+
+	/* ungate core clock */
+	if (cpu_clock_gates[cpu])
+		clk_enable(cpu_clock_gates[cpu]);
+
+	/* power up the core */
+	{
+		void __iomem *lpcr = (void __iomem *)0xb0000004;
+		void __iomem *clkgr1 = (void __iomem *)0xb0000028;
+
+		writel(readl(lpcr) & ~BIT(31), lpcr);
+		writel(readl(clkgr1) & ~BIT(15), clkgr1);
+
+		/* wait for the CPU to be powered up */
+		while (readl(lpcr) & BIT(27))
+			;
+	}
+
+	/* set entry sp/gp register values */
+	jz4780_cpu_entry_sp = __KSTK_TOS(idle);
+	jz4780_cpu_entry_gp = (u32)task_thread_info(idle);
+	smp_wmb();
+
+	/* take the core out of reset */
+	ctrl &= ~(CORECTRL_SWRST0 << cpu);
+	write_c0_corectrl(ctrl);
+
+	cpumask_set_cpu(cpu, &cpu_running);
+
+	spin_unlock_irqrestore(&smp_lock, flags);
+
+	return 0;
+}
+
+static void jz4780_init_secondary(void)
+{
+}
+
+static void jz4780_smp_finish(void)
+{
+	u32 reim;
+
+	spin_lock(&smp_lock);
+
+	/* unmask mailbox interrupts for this core */
+	reim = read_c0_reim();
+	reim |= REIM_MBOXIRQ0M << smp_processor_id();
+	write_c0_reim(reim);
+
+	spin_unlock(&smp_lock);
+
+	/* unmask interrupts for this core */
+	change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP2 |
+			 STATUSF_IP1 | STATUSF_IP0);
+	irq_enable_hazard();
+
+	/* force broadcast timer */
+	tick_broadcast_force();
+}
+
+static void jz4780_send_ipi_single_locked(int cpu, unsigned int action)
+{
+	u32 mbox;
+
+	switch (cpu) {
+	case 0:
+		mbox = read_c0_mailbox0();
+		write_c0_mailbox0(mbox | action);
+		break;
+	case 1:
+		mbox = read_c0_mailbox1();
+		write_c0_mailbox1(mbox | action);
+		break;
+	default:
+		panic("unhandled cpu %d!", cpu);
+	}
+}
+
+static void jz4780_send_ipi_single(int cpu, unsigned int action)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&smp_lock, flags);
+	jz4780_send_ipi_single_locked(cpu, action);
+	spin_unlock_irqrestore(&smp_lock, flags);
+}
+
+static void jz4780_send_ipi_mask(const struct cpumask *mask,
+				 unsigned int action)
+{
+	unsigned long flags;
+	int cpu;
+
+	spin_lock_irqsave(&smp_lock, flags);
+
+	for_each_cpu(cpu, mask)
+		jz4780_send_ipi_single_locked(cpu, action);
+
+	spin_unlock_irqrestore(&smp_lock, flags);
+}
+
+static struct plat_smp_ops jz4780_smp_ops = {
+	.send_ipi_single = jz4780_send_ipi_single,
+	.send_ipi_mask = jz4780_send_ipi_mask,
+	.init_secondary = jz4780_init_secondary,
+	.smp_finish = jz4780_smp_finish,
+	.boot_secondary = jz4780_boot_secondary,
+	.smp_setup = jz4780_smp_setup,
+	.prepare_cpus = jz4780_smp_prepare_cpus,
+};
+
+void jz4780_smp_init(void)
+{
+	register_smp_ops(&jz4780_smp_ops);
+}
diff --git a/arch/mips/kernel/idle.c b/arch/mips/kernel/idle.c
index 37f8e78..a406de3 100644
--- a/arch/mips/kernel/idle.c
+++ b/arch/mips/kernel/idle.c
@@ -19,6 +19,10 @@
 #include <asm/idle.h>
 #include <asm/mipsregs.h>
 
+#ifdef CONFIG_MACH_JZ4780
+# include <asm/mach-jz4740/jz4780-smp.h>
+#endif
+
 /*
  * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
  * the implementation of the "wait" feature differs between CPU families. This
@@ -172,7 +176,6 @@ void __init check_wait(void)
 	case CPU_CAVIUM_OCTEON_PLUS:
 	case CPU_CAVIUM_OCTEON2:
 	case CPU_CAVIUM_OCTEON3:
-	case CPU_XBURST:
 	case CPU_LOONGSON32:
 	case CPU_XLR:
 	case CPU_XLP:
@@ -246,6 +249,15 @@ void __init check_wait(void)
 		   cpu_wait = r4k_wait;
 		 */
 		break;
+	case CPU_XBURST:
+#if defined(CONFIG_MACH_JZ4780) && defined(CONFIG_SMP)
+		if (NR_CPUS > 1)
+			cpu_wait = jz4780_smp_wait_irqoff;
+		else
+			cpu_wait = r4k_wait;
+#else
+		cpu_wait = r4k_wait;
+#endif
 	default:
 		break;
 	}
diff --git a/drivers/irqchip/irq-ingenic.c b/drivers/irqchip/irq-ingenic.c
index 01d18b3..56a9648 100644
--- a/drivers/irqchip/irq-ingenic.c
+++ b/drivers/irqchip/irq-ingenic.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 
 #include <asm/io.h>
+#include <asm/mipsregs.h>
 #include <asm/mach-jz4740/irq.h>
 
 struct ingenic_intc_data {
@@ -32,6 +33,26 @@ struct ingenic_intc_data {
 #define JZ_REG_INTC_PENDING	0x10
 #define CHIP_SIZE		0x20
 
+asmlinkage void plat_irq_dispatch(void)
+{
+	uint32_t pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
+
+	if (pending & CAUSEF_IP4) {
+		/* from OS timer */
+		do_IRQ(4);
+#ifdef CONFIG_SMP
+	} else if (pending & CAUSEF_IP3) {
+		/* from a mailbox write */
+		do_IRQ(3);
+#endif
+	} else if (pending & CAUSEF_IP2) {
+		/* from interrupt controller */
+		do_IRQ(2);
+	} else {
+		spurious_interrupt();
+	}
+}
+
 static irqreturn_t intc_cascade(int irq, void *data)
 {
 	struct ingenic_intc_data *intc = irq_get_handler_data(irq);
-- 
2.7.4

[PATCH 2/6] clocksource: Ingenic: Add high resolution timer support for SMP.

[周琰杰 (Zhou Yanjie)]

Enable clock event handling on per CPU core basis.
Make sure that interrupts raised on the first core execute
event handlers on the correct CPU core.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 drivers/clocksource/ingenic-timer.c | 114 +++++++++++++++++++++++++++++-------
 1 file changed, 93 insertions(+), 21 deletions(-)

diff --git a/drivers/clocksource/ingenic-timer.c b/drivers/clocksource/ingenic-timer.c
index 4bbdb3d..1d32652 100644
--- a/drivers/clocksource/ingenic-timer.c
+++ b/drivers/clocksource/ingenic-timer.c
@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * JZ47xx SoCs TCU IRQ driver
+ * XBurst SoCs TCU IRQ driver
  * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
+ * Copyright (C) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
  */
 
 #include <linux/bitops.h>
@@ -27,12 +28,15 @@ struct ingenic_soc_info {
 
 struct ingenic_tcu {
 	struct regmap *map;
+	struct device_node *np;
 	struct clk *timer_clk, *cs_clk;
+	unsigned int timer_local[NR_CPUS];
 	unsigned int timer_channel, cs_channel;
 	struct clock_event_device cevt;
 	struct clocksource cs;
-	char name[4];
+	char name[16];
 	unsigned long pwm_channels_mask;
+	int cpu;
 };
 
 static struct ingenic_tcu *ingenic_tcu;
@@ -81,6 +85,30 @@ static int ingenic_tcu_cevt_set_next(unsigned long next,
 	return 0;
 }
 
+static void ingenic_per_cpu_event_handle(void *info)
+{
+	struct clock_event_device *cevt = (struct clock_event_device *) info;
+
+	if (cevt->event_handler)
+		cevt->event_handler(cevt);
+}
+
+static void ingenic_tcu_per_cpu_cb(struct clock_event_device *evt)
+{
+	struct clock_event_device *cevt = evt;
+	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+	if (smp_processor_id() == tcu->cpu) {
+		if (cevt->event_handler)
+			cevt->event_handler(cevt);
+	} else {
+		arch_local_irq_enable();
+		smp_call_function_single(tcu->cpu,
+				ingenic_per_cpu_event_handle, (void *) cevt, 0);
+		arch_local_irq_disable();
+	}
+}
+
 static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
 {
 	struct clock_event_device *evt = dev_id;
@@ -88,8 +116,7 @@ static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
 
 	regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
 
-	if (evt->event_handler)
-		evt->event_handler(evt);
+	ingenic_tcu_per_cpu_cb(evt);
 
 	return IRQ_HANDLED;
 }
@@ -105,15 +132,23 @@ static struct clk * __init ingenic_tcu_get_clock(struct device_node *np, int id)
 	return of_clk_get_from_provider(&args);
 }
 
-static int __init ingenic_tcu_timer_init(struct device_node *np,
-					 struct ingenic_tcu *tcu)
+static int ingenic_tcu_setup_cevt(struct device_node *np,
+				     unsigned int channel)
 {
-	unsigned int timer_virq, channel = tcu->timer_channel;
+	unsigned int timer_virq;
 	struct irq_domain *domain;
+	struct ingenic_tcu *tcu;
 	unsigned long rate;
 	int err;
 
+	tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+	if (!tcu)
+		return -ENOMEM;
+
+	tcu->map = ingenic_tcu->map;
+
 	tcu->timer_clk = ingenic_tcu_get_clock(np, channel);
+
 	if (IS_ERR(tcu->timer_clk))
 		return PTR_ERR(tcu->timer_clk);
 
@@ -139,13 +174,15 @@ static int __init ingenic_tcu_timer_init(struct device_node *np,
 		goto err_clk_disable;
 	}
 
-	snprintf(tcu->name, sizeof(tcu->name), "TCU");
+	snprintf(tcu->name, sizeof(tcu->name), "TCU channel.%u", channel);
 
 	err = request_irq(timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
 			  tcu->name, &tcu->cevt);
 	if (err)
 		goto err_irq_dispose_mapping;
 
+	tcu->cpu = smp_processor_id();
+	tcu->timer_channel = channel;
 	tcu->cevt.cpumask = cpumask_of(smp_processor_id());
 	tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
 	tcu->cevt.name = tcu->name;
@@ -233,12 +270,32 @@ static const struct of_device_id ingenic_tcu_of_match[] = {
 	{ /* sentinel */ }
 };
 
+static int register_cpu_online(unsigned int cpu)
+{
+	int ret;
+
+	ret = ingenic_tcu_setup_cevt(ingenic_tcu->np,
+						ingenic_tcu->timer_local[cpu]);
+	if (ret)
+		goto err_tcu_clocksource_cleanup;
+
+	return 0;
+
+err_tcu_clocksource_cleanup:
+	clocksource_unregister(&ingenic_tcu->cs);
+	clk_disable_unprepare(ingenic_tcu->cs_clk);
+	clk_put(ingenic_tcu->cs_clk);
+	kfree(ingenic_tcu);
+	return ret;
+}
+
 static int __init ingenic_tcu_init(struct device_node *np)
 {
 	const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
 	const struct ingenic_soc_info *soc_info = id->data;
 	struct ingenic_tcu *tcu;
 	struct regmap *map;
+	unsigned cpu = 0;
 	long rate;
 	int ret;
 
@@ -253,12 +310,14 @@ static int __init ingenic_tcu_init(struct device_node *np)
 		return -ENOMEM;
 
 	/* Enable all TCU channels for PWM use by default except channels 0/1 */
-	tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, 2);
+	tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1,
+								NR_CPUS + 1);
 	of_property_read_u32(np, "ingenic,pwm-channels-mask",
 			     (u32 *)&tcu->pwm_channels_mask);
 
 	/* Verify that we have at least two free channels */
-	if (hweight8(tcu->pwm_channels_mask) > soc_info->num_channels - 2) {
+	if (hweight8(tcu->pwm_channels_mask) >
+			soc_info->num_channels - NR_CPUS + 1) {
 		pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__,
 			tcu->pwm_channels_mask);
 		ret = -EINVAL;
@@ -266,13 +325,29 @@ static int __init ingenic_tcu_init(struct device_node *np)
 	}
 
 	tcu->map = map;
+	tcu->np = np;
 	ingenic_tcu = tcu;
 
-	tcu->timer_channel = find_first_zero_bit(&tcu->pwm_channels_mask,
+	tcu->timer_local[cpu] = find_first_zero_bit(&tcu->pwm_channels_mask,
 						 soc_info->num_channels);
-	tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
-					     soc_info->num_channels,
-					     tcu->timer_channel + 1);
+
+	if (NR_CPUS > 1) {
+		for (cpu = 1; cpu < NR_CPUS; cpu++)
+			tcu->timer_local[cpu] = find_next_zero_bit(
+						&tcu->pwm_channels_mask,
+						soc_info->num_channels,
+						tcu->timer_local[cpu - 1] + 1);
+
+		tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
+					soc_info->num_channels,
+					tcu->timer_local[cpu-1] + 1);
+	} else {
+		tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask,
+					soc_info->num_channels,
+					tcu->timer_local[cpu] + 1);
+	}
+
+
 
 	ret = ingenic_tcu_clocksource_init(np, tcu);
 	if (ret) {
@@ -280,9 +355,10 @@ static int __init ingenic_tcu_init(struct device_node *np)
 		goto err_free_ingenic_tcu;
 	}
 
-	ret = ingenic_tcu_timer_init(np, tcu);
-	if (ret)
-		goto err_tcu_clocksource_cleanup;
+	/* Setup clock events on each CPU core */
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "Ingenic XBurst: online",
+				register_cpu_online, NULL);
+	WARN_ON(ret < 0);
 
 	/* Register the sched_clock at the end as there's no way to undo it */
 	rate = clk_get_rate(tcu->cs_clk);
@@ -290,10 +366,6 @@ static int __init ingenic_tcu_init(struct device_node *np)
 
 	return 0;
 
-err_tcu_clocksource_cleanup:
-	clocksource_unregister(&tcu->cs);
-	clk_disable_unprepare(tcu->cs_clk);
-	clk_put(tcu->cs_clk);
 err_free_ingenic_tcu:
 	kfree(tcu);
 	return ret;
-- 
2.7.4

[PATCH 3/6] dt-bindings: MIPS: Document Ingenic SoCs binding.

[周琰杰 (Zhou Yanjie)]

Document the available properties for the SoC root node and the
CPU nodes of the devicetree for the Ingenic XBurst SoCs.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 .../bindings/mips/ingenic/ingenic,cpu.txt          | 32 ++++++++++++++++++++++
 .../bindings/mips/ingenic/ingenic,soc,txt          | 18 ++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
 create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt

diff --git a/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt b/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
new file mode 100644
index 00000000..f23e9be
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
@@ -0,0 +1,32 @@
+Bindings for Ingenic XBurst family CPUs.
+
+Required properties:
+- device_type: Must be "cpu".
+- compatible: One of:
+  - "ingenic,xburst".
+  - "ingenic,xburst2".
+- reg: The number of the CPU.
+
+Example:
+cpus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	cpu0: cpu@0 {
+		device_type = "cpu";
+		compatible = "ingenic,xburst";
+		reg = <0>;
+
+		clocks = <&cgu JZ4780_CLK_CPU>;
+		clock-names = "cpu";
+	};
+
+	cpu1: cpu@1 {
+		device_type = "cpu";
+		compatible = "ingenic,xburst";
+		reg = <1>;
+
+		clocks = <&cgu JZ4780_CLK_CORE1>;
+		clock-names = "cpu";
+	};
+};
diff --git a/Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt b/Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt
new file mode 100644
index 00000000..c731fa3
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt
@@ -0,0 +1,18 @@
+Bindings for Ingenic SoCs with XBurst CPU inside.
+
+Required properties:
+- compatible: One of:
+  - "ingenic,jz4740".
+  - "ingenic,jz4725b".
+  - "ingenic,jz4760".
+  - "ingenic,jz4760b".
+  - "ingenic,jz4770".
+  - "ingenic,jz4780".
+  - "ingenic,x1000".
+  - "ingenic,x1000e".
+  - "ingenic,x1500".
+
+Example:
+#address-cells = <1>;
+#size-cells = <1>;
+compatible = "ingenic,jz4780";
-- 
2.7.4

[PATCH 4/6] MIPS: Ingenic: Add 'cpus' node for Ingenic SoCs.

[周琰杰 (Zhou Yanjie)]

Add 'cpus' node to the jz4740.dtsi, jz4770.dtsi, jz4780.dtsi
and x1000.dtsi files.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 arch/mips/boot/dts/ingenic/jz4740.dtsi | 14 ++++++++++++++
 arch/mips/boot/dts/ingenic/jz4770.dtsi | 15 ++++++++++++++-
 arch/mips/boot/dts/ingenic/jz4780.dtsi | 23 +++++++++++++++++++++++
 arch/mips/boot/dts/ingenic/x1000.dtsi  | 14 ++++++++++++++
 4 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/arch/mips/boot/dts/ingenic/jz4740.dtsi b/arch/mips/boot/dts/ingenic/jz4740.dtsi
index 5accda2..9627d95 100644
--- a/arch/mips/boot/dts/ingenic/jz4740.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4740.dtsi
@@ -6,6 +6,20 @@
 	#size-cells = <1>;
 	compatible = "ingenic,jz4740";
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "ingenic,xburst";
+			reg = <0>;
+
+			clocks = <&cgu JZ4740_CLK_CCLK>;
+			clock-names = "cpu";
+		};
+	};
+
 	cpuintc: interrupt-controller {
 		#address-cells = <0>;
 		#interrupt-cells = <1>;
diff --git a/arch/mips/boot/dts/ingenic/jz4770.dtsi b/arch/mips/boot/dts/ingenic/jz4770.dtsi
index 0bfb9ed..1b8114d 100644
--- a/arch/mips/boot/dts/ingenic/jz4770.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4770.dtsi
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-
 #include <dt-bindings/clock/jz4770-cgu.h>
 
 / {
@@ -7,6 +6,20 @@
 	#size-cells = <1>;
 	compatible = "ingenic,jz4770";
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "ingenic,xburst";
+			reg = <0>;
+
+			clocks = <&cgu JZ4770_CLK_CCLK>;
+			clock-names = "cpu";
+		};
+	};
+
 	cpuintc: interrupt-controller {
 		#address-cells = <0>;
 		#interrupt-cells = <1>;
diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index f928329..93a0604 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -7,6 +7,29 @@
 	#size-cells = <1>;
 	compatible = "ingenic,jz4780";
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "ingenic,xburst";
+			reg = <0>;
+
+			clocks = <&cgu JZ4780_CLK_CPU>;
+			clock-names = "cpu";
+		};
+
+		cpu1: cpu@1 {
+			device_type = "cpu";
+			compatible = "ingenic,xburst";
+			reg = <1>;
+
+			clocks = <&cgu JZ4780_CLK_CORE1>;
+			clock-names = "cpu";
+		};
+	};
+
 	cpuintc: interrupt-controller {
 		#address-cells = <0>;
 		#interrupt-cells = <1>;
diff --git a/arch/mips/boot/dts/ingenic/x1000.dtsi b/arch/mips/boot/dts/ingenic/x1000.dtsi
index 61061a4..ea54263 100644
--- a/arch/mips/boot/dts/ingenic/x1000.dtsi
+++ b/arch/mips/boot/dts/ingenic/x1000.dtsi
@@ -7,6 +7,20 @@
 	#size-cells = <1>;
 	compatible = "ingenic,x1000", "ingenic,x1000e";
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "ingenic,xburst";
+			reg = <0>;
+
+			clocks = <&cgu X1000_CLK_CPU>;
+			clock-names = "cpu";
+		};
+	};
+
 	cpuintc: interrupt-controller {
 		#address-cells = <0>;
 		#interrupt-cells = <1>;
-- 
2.7.4

[PATCH 5/6] MIPS: CI20: Modify DTS to support high resolution timer for SMP.

[周琰杰 (Zhou Yanjie)]

Modify DTS, change tcu channel from 2 to 3, channel #0 and #1 for
per core local timer, #2 for clocksource.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 arch/mips/boot/dts/ingenic/ci20.dts | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 37b9316..98c4c42 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -456,6 +456,13 @@
 
 &tcu {
 	/* 3 MHz for the system timer and clocksource */
-	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
-	assigned-clock-rates = <3000000>, <3000000>;
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>,
+					  <&tcu TCU_CLK_TIMER2>;
+	assigned-clock-rates = <3000000>, <3000000>, <750000>;
+
+	/*
+	 * Use channel #0 and #1 for the per core system timer,
+	 * and use channel #2 for the clocksource.
+	 */
+	ingenic,pwm-channels-mask = <0xF8>;
 };
-- 
2.7.4

[PATCH 6/6] MIPS: CI20: Update defconfig to support SMP.

[周琰杰 (Zhou Yanjie)]

Add "CONFIG_SMP=y" and "CONFIG_NR_CPUS=2" to support SMP.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---
 arch/mips/configs/ci20_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/configs/ci20_defconfig b/arch/mips/configs/ci20_defconfig
index be41df2..3aadb2e 100644
--- a/arch/mips/configs/ci20_defconfig
+++ b/arch/mips/configs/ci20_defconfig
@@ -1,3 +1,5 @@
+CONFIG_SMP=y
+CONFIG_NR_CPUS=2
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_KERNEL_XZ=y
 CONFIG_SYSVIPC=y
-- 
2.7.4

Re: [PATCH 1/6] MIPS: JZ4780: Introduce SMP support.

[Jiaxun Yang]

14.01.2020, 00:44, "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>:
> Forward port smp support from kernel 3.18.3 of CI20_linux
> to upstream kernel 5.5.
>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
> ---
>  arch/mips/include/asm/mach-jz4740/jz4780-smp.h | 91 ++++++++
>  arch/mips/jz4740/Kconfig | 3 +
>  arch/mips/jz4740/Makefile | 5 +
>  arch/mips/jz4740/prom.c | 4 +
>  arch/mips/jz4740/smp-entry.S | 57 +++++
>  arch/mips/jz4740/smp.c | 300 +++++++++++++++++++++++++
>  arch/mips/kernel/idle.c | 14 +-
>  drivers/irqchip/irq-ingenic.c | 21 ++
>  8 files changed, 494 insertions(+), 1 deletion(-)
>  create mode 100644 arch/mips/include/asm/mach-jz4740/jz4780-smp.h
>  create mode 100644 arch/mips/jz4740/smp-entry.S
>  create mode 100644 arch/mips/jz4740/smp.c

Hi 周琰杰:

Thanks for your work! See my review comments below


> diff --git a/arch/mips/jz4740/smp.c b/arch/mips/jz4740/smp.c
> new file mode 100644
> index 00000000..d36e0b2
> --- /dev/null
> +++ b/arch/mips/jz4740/smp.c
> @@ -0,0 +1,300 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2013, Paul Burton <paul.burton@imgtec.com>
> + * JZ4780 SMP
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/of.h>
> +#include <linux/sched.h>
> +#include <linux/sched/task_stack.h>
> +#include <linux/smp.h>
> +#include <linux/tick.h>
> +#include <asm/mach-jz4740/jz4780-smp.h>
> +#include <asm/r4kcache.h>
> +#include <asm/smp-ops.h>
> +
> +static struct clk *cpu_clock_gates[CONFIG_NR_CPUS] = { NULL };
> +
> +u32 jz4780_cpu_entry_sp;
> +u32 jz4780_cpu_entry_gp;
> +
> +static struct cpumask cpu_running;
> +
> +static DEFINE_SPINLOCK(smp_lock);
> +
> +extern void (*r4k_blast_dcache)(void);
> +
> +/*
> + * The Ingenic jz4780 SMP variant has to write back dirty cache lines before
> + * executing wait. The CPU & cache clock will be gated until we return from
> + * the wait, and if another core attempts to access data from our data cache
> + * during this time then it will lock up.
> + */
> +void jz4780_smp_wait_irqoff(void)
> +{
> + unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
> +
> + /*
> + * Going to idle has a significant overhead due to the cache flush so
> + * try to avoid it if we'll immediately be woken again due to an IRQ.
> + */
> + if (!need_resched() && !pending) {
> + r4k_blast_dcache();
> +
> + __asm__(
> + " .set push \n"
> + " .set mips3 \n"
> + " sync \n"
> + " wait \n"
> + " .set pop \n");
> + }
> +
> + local_irq_enable();
> +}
> +
> +static irqreturn_t mbox_handler(int irq, void *dev_id)
> +{
> + int cpu = smp_processor_id();
> + u32 action, status;
> +
> + spin_lock(&smp_lock);
> +
> + switch (cpu) {
> + case 0:
> + action = read_c0_mailbox0();
> + write_c0_mailbox0(0);
> + break;
> + case 1:
> + action = read_c0_mailbox1();
> + write_c0_mailbox1(0);
> + break;
> + default:
> + panic("unhandled cpu %d!", cpu);
> + }
> +
> + /* clear pending mailbox interrupt */
> + status = read_c0_corestatus();
> + status &= ~(CORESTATUS_MIRQ0P << cpu);
> + write_c0_corestatus(status);
> +
> + spin_unlock(&smp_lock);
> +
> + if (action & SMP_RESCHEDULE_YOURSELF)
> + scheduler_ipi();
> + if (action & SMP_CALL_FUNCTION)
> + generic_smp_call_function_interrupt();
> +
> + return IRQ_HANDLED;
> +}
> +
> +static struct irqaction mbox_action = {
> + .handler = mbox_handler,
> + .name = "core mailbox",
> + .flags = IRQF_PERCPU | IRQF_NO_THREAD,
> +};
> +
> +static void jz4780_smp_setup(void)
> +{
> + u32 addr, reim;
> + int cpu;
> +
> + reim = read_c0_reim();
> +
> + for (cpu = 0; cpu < NR_CPUS; cpu++) {
> + __cpu_number_map[cpu] = cpu;
> + __cpu_logical_map[cpu] = cpu;
> + set_cpu_possible(cpu, true);
> + }
> +
> + /* mask mailbox interrupts for this core */
> + reim &= ~REIM_MBOXIRQ0M;
> + write_c0_reim(reim);
> +
> + /* clear mailboxes & pending mailbox IRQs */
> + write_c0_mailbox0(0);
> + write_c0_mailbox1(0);
> + write_c0_corestatus(0);
> +
> + /* set reset entry point */
> + addr = KSEG1ADDR((u32)&jz4780_secondary_cpu_entry);
> + WARN_ON(addr & ~REIM_ENTRY);
> + reim &= ~REIM_ENTRY;
> + reim |= addr & REIM_ENTRY;
> +
> + /* unmask mailbox interrupts for this core */
> + reim |= REIM_MBOXIRQ0M;
> + write_c0_reim(reim);
> + set_c0_status(STATUSF_IP3);

Only IP3? Could other interrupt be routed to this core?

> + irq_enable_hazard();
> +
> + cpumask_set_cpu(cpu, &cpu_running);
> +}
> +
> +static void jz4780_smp_prepare_cpus(unsigned int max_cpus)
> +{
> + struct device_node *cpu_node;
> + unsigned cpu, ctrl;
> + int err;
> +
> + /* setup the mailbox IRQ */
> + setup_irq(MIPS_CPU_IRQ_BASE + 3, &mbox_action);
> +
> + init_cpu_present(cpu_possible_mask);
> +
> + ctrl = read_c0_corectrl();
> +
> + for (cpu = 0; cpu < max_cpus; cpu++) {
> + /* use reset entry point from REIM register */
> + ctrl |= CORECTRL_RPC0 << cpu;
> + }
> +
> + for_each_compatible_node(cpu_node, NULL, "ingenic,xburst") {
> + err = of_property_read_u32_index(cpu_node, "reg", 0, &cpu);
> + if (err) {
> + pr_err("Failed to read index of %s\n",
> + cpu_node->full_name);
> + continue;
> + }
> +
> + cpu_clock_gates[cpu] = of_clk_get(cpu_node, 0);
> + if (IS_ERR(cpu_clock_gates[cpu])) {
> + cpu_clock_gates[cpu] = NULL;
> + continue;
> + }
> +
> + err = clk_prepare(cpu_clock_gates[cpu]);
> + if (err)
> + pr_err("Failed to prepare CPU clock gate\n");
> + }
> +
> + write_c0_corectrl(ctrl);
> +}
> +
> +static int jz4780_boot_secondary(int cpu, struct task_struct *idle)
> +{
> + unsigned long flags;
> + u32 ctrl;
> +
> + spin_lock_irqsave(&smp_lock, flags);
> +
> + /* ensure the core is in reset */
> + ctrl = read_c0_corectrl();
> + ctrl |= CORECTRL_SWRST0 << cpu;
> + write_c0_corectrl(ctrl);
> +
> + /* ungate core clock */
> + if (cpu_clock_gates[cpu])
> + clk_enable(cpu_clock_gates[cpu]);
> +
> + /* power up the core */
> + {
> + void __iomem *lpcr = (void __iomem *)0xb0000004;
> + void __iomem *clkgr1 = (void __iomem *)0xb0000028;

Please avoid raw address pointer. If it's clock related, should we make a clk
driver for it? Or add a SMP controller node in DeviceTree for that address?
At least define a macro for it.

> +
> + writel(readl(lpcr) & ~BIT(31), lpcr);
> + writel(readl(clkgr1) & ~BIT(15), clkgr1);

The same, bits need macros. Otherwise, it's too hard for others to read.

> +
> + /* wait for the CPU to be powered up */
> + while (readl(lpcr) & BIT(27))
> + ;

Should we add a timeout check to avoid a dead loop? 

> + }
> +
> + /* set entry sp/gp register values */
> + jz4780_cpu_entry_sp = __KSTK_TOS(idle);
> + jz4780_cpu_entry_gp = (u32)task_thread_info(idle);
> + smp_wmb();
> +
> + /* take the core out of reset */
> + ctrl &= ~(CORECTRL_SWRST0 << cpu);
> + write_c0_corectrl(ctrl);
> +
> + cpumask_set_cpu(cpu, &cpu_running);
> +
> + spin_unlock_irqrestore(&smp_lock, flags);
> +
> + return 0;
> +}
> +
> +static void jz4780_init_secondary(void)
> +{
> +}
> +
> +static void jz4780_smp_finish(void)
> +{
> + u32 reim;
> +
> + spin_lock(&smp_lock);
> +
> + /* unmask mailbox interrupts for this core */
> + reim = read_c0_reim();
> + reim |= REIM_MBOXIRQ0M << smp_processor_id();
> + write_c0_reim(reim);
> +
> + spin_unlock(&smp_lock);
> +
> + /* unmask interrupts for this core */
> + change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP2 |
> + STATUSF_IP1 | STATUSF_IP0);
> + irq_enable_hazard();
> +
> + /* force broadcast timer */
> + tick_broadcast_force();
> +}
> +
> +static void jz4780_send_ipi_single_locked(int cpu, unsigned int action)
> +{
> + u32 mbox;
> +
> + switch (cpu) {
> + case 0:
> + mbox = read_c0_mailbox0();
> + write_c0_mailbox0(mbox | action);
> + break;
> + case 1:
> + mbox = read_c0_mailbox1();
> + write_c0_mailbox1(mbox | action);
> + break;
> + default:
> + panic("unhandled cpu %d!", cpu);
> + }
> +}
> +
> +static void jz4780_send_ipi_single(int cpu, unsigned int action)
> +{
> + unsigned long flags;
> +
> + spin_lock_irqsave(&smp_lock, flags);
> + jz4780_send_ipi_single_locked(cpu, action);
> + spin_unlock_irqrestore(&smp_lock, flags);
> +}
> +
> +static void jz4780_send_ipi_mask(const struct cpumask *mask,
> + unsigned int action)
> +{
> + unsigned long flags;
> + int cpu;
> +
> + spin_lock_irqsave(&smp_lock, flags);
> +
> + for_each_cpu(cpu, mask)
> + jz4780_send_ipi_single_locked(cpu, action);
> +
> + spin_unlock_irqrestore(&smp_lock, flags);
> +}
> +
> +static struct plat_smp_ops jz4780_smp_ops = {
> + .send_ipi_single = jz4780_send_ipi_single,
> + .send_ipi_mask = jz4780_send_ipi_mask,
> + .init_secondary = jz4780_init_secondary,
> + .smp_finish = jz4780_smp_finish,
> + .boot_secondary = jz4780_boot_secondary,
> + .smp_setup = jz4780_smp_setup,
> + .prepare_cpus = jz4780_smp_prepare_cpus,
> +};
> +
> +void jz4780_smp_init(void)
> +{
> + register_smp_ops(&jz4780_smp_ops);
> +}
> diff --git a/arch/mips/kernel/idle.c b/arch/mips/kernel/idle.c
> index 37f8e78..a406de3 100644
> --- a/arch/mips/kernel/idle.c
> +++ b/arch/mips/kernel/idle.c
> @@ -19,6 +19,10 @@
>  #include <asm/idle.h>
>  #include <asm/mipsregs.h>
>
> +#ifdef CONFIG_MACH_JZ4780
> +# include <asm/mach-jz4740/jz4780-smp.h>
> +#endif
> +
>  /*
>   * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
>   * the implementation of the "wait" feature differs between CPU families. This
> @@ -172,7 +176,6 @@ void __init check_wait(void)
>          case CPU_CAVIUM_OCTEON_PLUS:
>          case CPU_CAVIUM_OCTEON2:
>          case CPU_CAVIUM_OCTEON3:
> - case CPU_XBURST:
>          case CPU_LOONGSON32:
>          case CPU_XLR:
>          case CPU_XLP:
> @@ -246,6 +249,15 @@ void __init check_wait(void)
>                     cpu_wait = r4k_wait;
>                   */
>                  break;
> + case CPU_XBURST:
> +#if defined(CONFIG_MACH_JZ4780) && defined(CONFIG_SMP)
> + if (NR_CPUS > 1)
> + cpu_wait = jz4780_smp_wait_irqoff;
> + else
> + cpu_wait = r4k_wait;
> +#else
> + cpu_wait = r4k_wait;
> +#endif
>          default:
>                  break;
>          }
> diff --git a/drivers/irqchip/irq-ingenic.c b/drivers/irqchip/irq-ingenic.c
> index 01d18b3..56a9648 100644
> --- a/drivers/irqchip/irq-ingenic.c
> +++ b/drivers/irqchip/irq-ingenic.c
> @@ -17,6 +17,7 @@
>  #include <linux/delay.h>
>
>  #include <asm/io.h>
> +#include <asm/mipsregs.h>
>  #include <asm/mach-jz4740/irq.h>
>
>  struct ingenic_intc_data {
> @@ -32,6 +33,26 @@ struct ingenic_intc_data {
>  #define JZ_REG_INTC_PENDING 0x10
>  #define CHIP_SIZE 0x20
>
> +asmlinkage void plat_irq_dispatch(void)
> +{
> + uint32_t pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
> +
> + if (pending & CAUSEF_IP4) {
> + /* from OS timer */
> + do_IRQ(4);
> +#ifdef CONFIG_SMP
> + } else if (pending & CAUSEF_IP3) {
> + /* from a mailbox write */
> + do_IRQ(3);
> +#endif
> + } else if (pending & CAUSEF_IP2) {
> + /* from interrupt controller */
> + do_IRQ(2);
> + } else {
> + spurious_interrupt();
> + }
> +}
> +

Why we need this? irq-mips-cpu driver is doing the same thing.

>  static irqreturn_t intc_cascade(int irq, void *data)
>  {
>          struct ingenic_intc_data *intc = irq_get_handler_data(irq);
> --
> 2.7.4

Thanks.

--
Jiaxun Yang

Re: [PATCH 3/6] dt-bindings: MIPS: Document Ingenic SoCs binding.

[Jiaxun Yang]

14.01.2020, 00:44, "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>:
> Document the available properties for the SoC root node and the
> CPU nodes of the devicetree for the Ingenic XBurst SoCs.
>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
> ---
>  .../bindings/mips/ingenic/ingenic,cpu.txt | 32 ++++++++++++++++++++++
>  .../bindings/mips/ingenic/ingenic,soc,txt | 18 ++++++++++++
>  2 files changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
>  create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt
>

We'd better use schemas for the document.

See[1]

Thanks.

[1]: https://lwn.net/Articles/771621/
--
Jiaxun Yang

Re: [PATCH 1/6] MIPS: JZ4780: Introduce SMP support.

[Zhou Yanjie]

Hi Jiaxun,

On 2020年01月14日 12:55, Jiaxun Yang wrote:
>
> 14.01.2020, 00:44, "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>:
>> Forward port smp support from kernel 3.18.3 of CI20_linux
>> to upstream kernel 5.5.
>>
>> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
>> ---
>>   arch/mips/include/asm/mach-jz4740/jz4780-smp.h | 91 ++++++++
>>   arch/mips/jz4740/Kconfig | 3 +
>>   arch/mips/jz4740/Makefile | 5 +
>>   arch/mips/jz4740/prom.c | 4 +
>>   arch/mips/jz4740/smp-entry.S | 57 +++++
>>   arch/mips/jz4740/smp.c | 300 +++++++++++++++++++++++++
>>   arch/mips/kernel/idle.c | 14 +-
>>   drivers/irqchip/irq-ingenic.c | 21 ++
>>   8 files changed, 494 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/mips/include/asm/mach-jz4740/jz4780-smp.h
>>   create mode 100644 arch/mips/jz4740/smp-entry.S
>>   create mode 100644 arch/mips/jz4740/smp.c
> Hi 周琰杰:
>
> Thanks for your work! See my review comments below
>
>
>> diff --git a/arch/mips/jz4740/smp.c b/arch/mips/jz4740/smp.c
>> new file mode 100644
>> index 00000000..d36e0b2
>> --- /dev/null
>> +++ b/arch/mips/jz4740/smp.c
>> @@ -0,0 +1,300 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2013, Paul Burton <paul.burton@imgtec.com>
>> + * JZ4780 SMP
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/of.h>
>> +#include <linux/sched.h>
>> +#include <linux/sched/task_stack.h>
>> +#include <linux/smp.h>
>> +#include <linux/tick.h>
>> +#include <asm/mach-jz4740/jz4780-smp.h>
>> +#include <asm/r4kcache.h>
>> +#include <asm/smp-ops.h>
>> +
>> +static struct clk *cpu_clock_gates[CONFIG_NR_CPUS] = { NULL };
>> +
>> +u32 jz4780_cpu_entry_sp;
>> +u32 jz4780_cpu_entry_gp;
>> +
>> +static struct cpumask cpu_running;
>> +
>> +static DEFINE_SPINLOCK(smp_lock);
>> +
>> +extern void (*r4k_blast_dcache)(void);
>> +
>> +/*
>> + * The Ingenic jz4780 SMP variant has to write back dirty cache lines before
>> + * executing wait. The CPU & cache clock will be gated until we return from
>> + * the wait, and if another core attempts to access data from our data cache
>> + * during this time then it will lock up.
>> + */
>> +void jz4780_smp_wait_irqoff(void)
>> +{
>> + unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
>> +
>> + /*
>> + * Going to idle has a significant overhead due to the cache flush so
>> + * try to avoid it if we'll immediately be woken again due to an IRQ.
>> + */
>> + if (!need_resched() && !pending) {
>> + r4k_blast_dcache();
>> +
>> + __asm__(
>> + " .set push \n"
>> + " .set mips3 \n"
>> + " sync \n"
>> + " wait \n"
>> + " .set pop \n");
>> + }
>> +
>> + local_irq_enable();
>> +}
>> +
>> +static irqreturn_t mbox_handler(int irq, void *dev_id)
>> +{
>> + int cpu = smp_processor_id();
>> + u32 action, status;
>> +
>> + spin_lock(&smp_lock);
>> +
>> + switch (cpu) {
>> + case 0:
>> + action = read_c0_mailbox0();
>> + write_c0_mailbox0(0);
>> + break;
>> + case 1:
>> + action = read_c0_mailbox1();
>> + write_c0_mailbox1(0);
>> + break;
>> + default:
>> + panic("unhandled cpu %d!", cpu);
>> + }
>> +
>> + /* clear pending mailbox interrupt */
>> + status = read_c0_corestatus();
>> + status &= ~(CORESTATUS_MIRQ0P << cpu);
>> + write_c0_corestatus(status);
>> +
>> + spin_unlock(&smp_lock);
>> +
>> + if (action & SMP_RESCHEDULE_YOURSELF)
>> + scheduler_ipi();
>> + if (action & SMP_CALL_FUNCTION)
>> + generic_smp_call_function_interrupt();
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static struct irqaction mbox_action = {
>> + .handler = mbox_handler,
>> + .name = "core mailbox",
>> + .flags = IRQF_PERCPU | IRQF_NO_THREAD,
>> +};
>> +
>> +static void jz4780_smp_setup(void)
>> +{
>> + u32 addr, reim;
>> + int cpu;
>> +
>> + reim = read_c0_reim();
>> +
>> + for (cpu = 0; cpu < NR_CPUS; cpu++) {
>> + __cpu_number_map[cpu] = cpu;
>> + __cpu_logical_map[cpu] = cpu;
>> + set_cpu_possible(cpu, true);
>> + }
>> +
>> + /* mask mailbox interrupts for this core */
>> + reim &= ~REIM_MBOXIRQ0M;
>> + write_c0_reim(reim);
>> +
>> + /* clear mailboxes & pending mailbox IRQs */
>> + write_c0_mailbox0(0);
>> + write_c0_mailbox1(0);
>> + write_c0_corestatus(0);
>> +
>> + /* set reset entry point */
>> + addr = KSEG1ADDR((u32)&jz4780_secondary_cpu_entry);
>> + WARN_ON(addr & ~REIM_ENTRY);
>> + reim &= ~REIM_ENTRY;
>> + reim |= addr & REIM_ENTRY;
>> +
>> + /* unmask mailbox interrupts for this core */
>> + reim |= REIM_MBOXIRQ0M;
>> + write_c0_reim(reim);
>> + set_c0_status(STATUSF_IP3);
> Only IP3? Could other interrupt be routed to this core?

The original source code used STATUSF_IP3, but it work properly after 
changing it to ST0_IM. In the next version, I will replace STATUSF_IP3 
with ST0_IM

>> + irq_enable_hazard();
>> +
>> + cpumask_set_cpu(cpu, &cpu_running);
>> +}
>> +
>> +static void jz4780_smp_prepare_cpus(unsigned int max_cpus)
>> +{
>> + struct device_node *cpu_node;
>> + unsigned cpu, ctrl;
>> + int err;
>> +
>> + /* setup the mailbox IRQ */
>> + setup_irq(MIPS_CPU_IRQ_BASE + 3, &mbox_action);
>> +
>> + init_cpu_present(cpu_possible_mask);
>> +
>> + ctrl = read_c0_corectrl();
>> +
>> + for (cpu = 0; cpu < max_cpus; cpu++) {
>> + /* use reset entry point from REIM register */
>> + ctrl |= CORECTRL_RPC0 << cpu;
>> + }
>> +
>> + for_each_compatible_node(cpu_node, NULL, "ingenic,xburst") {
>> + err = of_property_read_u32_index(cpu_node, "reg", 0, &cpu);
>> + if (err) {
>> + pr_err("Failed to read index of %s\n",
>> + cpu_node->full_name);
>> + continue;
>> + }
>> +
>> + cpu_clock_gates[cpu] = of_clk_get(cpu_node, 0);
>> + if (IS_ERR(cpu_clock_gates[cpu])) {
>> + cpu_clock_gates[cpu] = NULL;
>> + continue;
>> + }
>> +
>> + err = clk_prepare(cpu_clock_gates[cpu]);
>> + if (err)
>> + pr_err("Failed to prepare CPU clock gate\n");
>> + }
>> +
>> + write_c0_corectrl(ctrl);
>> +}
>> +
>> +static int jz4780_boot_secondary(int cpu, struct task_struct *idle)
>> +{
>> + unsigned long flags;
>> + u32 ctrl;
>> +
>> + spin_lock_irqsave(&smp_lock, flags);
>> +
>> + /* ensure the core is in reset */
>> + ctrl = read_c0_corectrl();
>> + ctrl |= CORECTRL_SWRST0 << cpu;
>> + write_c0_corectrl(ctrl);
>> +
>> + /* ungate core clock */
>> + if (cpu_clock_gates[cpu])
>> + clk_enable(cpu_clock_gates[cpu]);
>> +
>> + /* power up the core */
>> + {
>> + void __iomem *lpcr = (void __iomem *)0xb0000004;
>> + void __iomem *clkgr1 = (void __iomem *)0xb0000028;
> Please avoid raw address pointer. If it's clock related, should we make a clk
> driver for it? Or add a SMP controller node in DeviceTree for that address?
> At least define a macro for it.

Sure, will change it in v2.

>
>> +
>> + writel(readl(lpcr) & ~BIT(31), lpcr);
>> + writel(readl(clkgr1) & ~BIT(15), clkgr1);
> The same, bits need macros. Otherwise, it's too hard for others to read.

Sure, will change it in v2.

>> +
>> + /* wait for the CPU to be powered up */
>> + while (readl(lpcr) & BIT(27))
>> + ;
> Should we add a timeout check to avoid a dead loop?

Sure, I'll add a timeout check in next version.

>> + }
>> +
>> + /* set entry sp/gp register values */
>> + jz4780_cpu_entry_sp = __KSTK_TOS(idle);
>> + jz4780_cpu_entry_gp = (u32)task_thread_info(idle);
>> + smp_wmb();
>> +
>> + /* take the core out of reset */
>> + ctrl &= ~(CORECTRL_SWRST0 << cpu);
>> + write_c0_corectrl(ctrl);
>> +
>> + cpumask_set_cpu(cpu, &cpu_running);
>> +
>> + spin_unlock_irqrestore(&smp_lock, flags);
>> +
>> + return 0;
>> +}
>> +
>> +static void jz4780_init_secondary(void)
>> +{
>> +}
>> +
>> +static void jz4780_smp_finish(void)
>> +{
>> + u32 reim;
>> +
>> + spin_lock(&smp_lock);
>> +
>> + /* unmask mailbox interrupts for this core */
>> + reim = read_c0_reim();
>> + reim |= REIM_MBOXIRQ0M << smp_processor_id();
>> + write_c0_reim(reim);
>> +
>> + spin_unlock(&smp_lock);
>> +
>> + /* unmask interrupts for this core */
>> + change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP2 |
>> + STATUSF_IP1 | STATUSF_IP0);
>> + irq_enable_hazard();
>> +
>> + /* force broadcast timer */
>> + tick_broadcast_force();
>> +}
>> +
>> +static void jz4780_send_ipi_single_locked(int cpu, unsigned int action)
>> +{
>> + u32 mbox;
>> +
>> + switch (cpu) {
>> + case 0:
>> + mbox = read_c0_mailbox0();
>> + write_c0_mailbox0(mbox | action);
>> + break;
>> + case 1:
>> + mbox = read_c0_mailbox1();
>> + write_c0_mailbox1(mbox | action);
>> + break;
>> + default:
>> + panic("unhandled cpu %d!", cpu);
>> + }
>> +}
>> +
>> +static void jz4780_send_ipi_single(int cpu, unsigned int action)
>> +{
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&smp_lock, flags);
>> + jz4780_send_ipi_single_locked(cpu, action);
>> + spin_unlock_irqrestore(&smp_lock, flags);
>> +}
>> +
>> +static void jz4780_send_ipi_mask(const struct cpumask *mask,
>> + unsigned int action)
>> +{
>> + unsigned long flags;
>> + int cpu;
>> +
>> + spin_lock_irqsave(&smp_lock, flags);
>> +
>> + for_each_cpu(cpu, mask)
>> + jz4780_send_ipi_single_locked(cpu, action);
>> +
>> + spin_unlock_irqrestore(&smp_lock, flags);
>> +}
>> +
>> +static struct plat_smp_ops jz4780_smp_ops = {
>> + .send_ipi_single = jz4780_send_ipi_single,
>> + .send_ipi_mask = jz4780_send_ipi_mask,
>> + .init_secondary = jz4780_init_secondary,
>> + .smp_finish = jz4780_smp_finish,
>> + .boot_secondary = jz4780_boot_secondary,
>> + .smp_setup = jz4780_smp_setup,
>> + .prepare_cpus = jz4780_smp_prepare_cpus,
>> +};
>> +
>> +void jz4780_smp_init(void)
>> +{
>> + register_smp_ops(&jz4780_smp_ops);
>> +}
>> diff --git a/arch/mips/kernel/idle.c b/arch/mips/kernel/idle.c
>> index 37f8e78..a406de3 100644
>> --- a/arch/mips/kernel/idle.c
>> +++ b/arch/mips/kernel/idle.c
>> @@ -19,6 +19,10 @@
>>   #include <asm/idle.h>
>>   #include <asm/mipsregs.h>
>>
>> +#ifdef CONFIG_MACH_JZ4780
>> +# include <asm/mach-jz4740/jz4780-smp.h>
>> +#endif
>> +
>>   /*
>>    * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
>>    * the implementation of the "wait" feature differs between CPU families. This
>> @@ -172,7 +176,6 @@ void __init check_wait(void)
>>           case CPU_CAVIUM_OCTEON_PLUS:
>>           case CPU_CAVIUM_OCTEON2:
>>           case CPU_CAVIUM_OCTEON3:
>> - case CPU_XBURST:
>>           case CPU_LOONGSON32:
>>           case CPU_XLR:
>>           case CPU_XLP:
>> @@ -246,6 +249,15 @@ void __init check_wait(void)
>>                      cpu_wait = r4k_wait;
>>                    */
>>                   break;
>> + case CPU_XBURST:
>> +#if defined(CONFIG_MACH_JZ4780) && defined(CONFIG_SMP)
>> + if (NR_CPUS > 1)
>> + cpu_wait = jz4780_smp_wait_irqoff;
>> + else
>> + cpu_wait = r4k_wait;
>> +#else
>> + cpu_wait = r4k_wait;
>> +#endif
>>           default:
>>                   break;
>>           }
>> diff --git a/drivers/irqchip/irq-ingenic.c b/drivers/irqchip/irq-ingenic.c
>> index 01d18b3..56a9648 100644
>> --- a/drivers/irqchip/irq-ingenic.c
>> +++ b/drivers/irqchip/irq-ingenic.c
>> @@ -17,6 +17,7 @@
>>   #include <linux/delay.h>
>>
>>   #include <asm/io.h>
>> +#include <asm/mipsregs.h>
>>   #include <asm/mach-jz4740/irq.h>
>>
>>   struct ingenic_intc_data {
>> @@ -32,6 +33,26 @@ struct ingenic_intc_data {
>>   #define JZ_REG_INTC_PENDING 0x10
>>   #define CHIP_SIZE 0x20
>>
>> +asmlinkage void plat_irq_dispatch(void)
>> +{
>> + uint32_t pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
>> +
>> + if (pending & CAUSEF_IP4) {
>> + /* from OS timer */
>> + do_IRQ(4);
>> +#ifdef CONFIG_SMP
>> + } else if (pending & CAUSEF_IP3) {
>> + /* from a mailbox write */
>> + do_IRQ(3);
>> +#endif
>> + } else if (pending & CAUSEF_IP2) {
>> + /* from interrupt controller */
>> + do_IRQ(2);
>> + } else {
>> + spurious_interrupt();
>> + }
>> +}
>> +
> Why we need this? irq-mips-cpu driver is doing the same thing.

OK, I will remove it in next version.

Thanks and best regards!

>>   static irqreturn_t intc_cascade(int irq, void *data)
>>   {
>>           struct ingenic_intc_data *intc = irq_get_handler_data(irq);
>> --
>> 2.7.4
> Thanks.
>
> --
> Jiaxun Yang

Re: [PATCH 3/6] dt-bindings: MIPS: Document Ingenic SoCs binding.

[Zhou Yanjie]

Hi Jiaxun,

On 2020年01月14日 12:59, Jiaxun Yang wrote:
>
> 14.01.2020, 00:44, "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>:
>> Document the available properties for the SoC root node and the
>> CPU nodes of the devicetree for the Ingenic XBurst SoCs.
>>
>> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
>> ---
>>   .../bindings/mips/ingenic/ingenic,cpu.txt | 32 ++++++++++++++++++++++
>>   .../bindings/mips/ingenic/ingenic,soc,txt | 18 ++++++++++++
>>   2 files changed, 50 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
>>   create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,soc,txt
>>
> We'd better use schemas for the document.

I will change it in v2.

Thanks and best regards!

>
> See[1]
>
> Thanks.
>
> [1]: https://lwn.net/Articles/771621/
> --
> Jiaxun Yang