[PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[Guo Ren]

This is about 12th patchset for C-SKY linux drivers and it should pair
with 8th kernel patchset.

Changelog:
 - Remove the set_irq_createmapping call back in csky-mp-intc.c.
 - Convert the cpumask to an interrupt-controller specific representation
   in driver's code, and not the SMP code's, and also modify the related
   codes in csky kernel patchset.
 - Add COMPILE_TEST for csky_mp_timer.
 - Fixup smp boot error, cpuhp_setup_state must after timer_of_init()
   for csky_mp_timer.

Any feedback is welcome, thx for all people review my patchset.

Guo Ren (8):
  irqchip: add C-SKY SMP interrupt controller
  dt-bindings: interrupt-controller: C-SKY SMP intc
  irqchip: add C-SKY APB bus interrupt controller
  dt-bindings: interrupt-controller: C-SKY APB intc
  clocksource: add C-SKY SMP timer
  dt-bindings: timer: C-SKY Multi-processor timer
  clocksource: add gx6605s SOC system timer
  dt-bindings: timer: gx6605s SOC timer

 .../interrupt-controller/csky,apb-intc.txt         |  62 +++++
 .../bindings/interrupt-controller/csky,mpintc.txt  |  40 +++
 .../bindings/timer/csky,gx6605s-timer.txt          |  42 ++++
 .../devicetree/bindings/timer/csky,mptimer.txt     |  42 ++++
 drivers/clocksource/Kconfig                        |  18 ++
 drivers/clocksource/Makefile                       |   2 +
 drivers/clocksource/timer-gx6605s.c                | 154 ++++++++++++
 drivers/clocksource/timer-mp-csky.c                | 173 +++++++++++++
 drivers/irqchip/Kconfig                            |  17 ++
 drivers/irqchip/Makefile                           |   2 +
 drivers/irqchip/irq-csky-apb-intc.c                | 274 +++++++++++++++++++++
 drivers/irqchip/irq-csky-mpintc.c                  | 198 +++++++++++++++
 include/linux/cpuhotplug.h                         |   1 +
 13 files changed, 1025 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
 create mode 100644 Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
 create mode 100644 Documentation/devicetree/bindings/timer/csky,mptimer.txt
 create mode 100644 drivers/clocksource/timer-gx6605s.c
 create mode 100644 drivers/clocksource/timer-mp-csky.c
 create mode 100644 drivers/irqchip/irq-csky-apb-intc.c
 create mode 100644 drivers/irqchip/irq-csky-mpintc.c

-- 
2.7.4

[PATCH V12 1/8] irqchip: add C-SKY SMP interrupt controller

[Guo Ren]

Irq-csky-mpintc is C-SKY smp system interrupt controller and it
could support 16 soft irqs, 16 private irqs, and 992 max common
irqs.

Changelog:
 - Remove set_ipi_irq_mapping.
 - Convert the cpumask to an interrupt-controller specific representation
   in driver's code, and not the SMP code's.
 - pass checkpatch.pl
 - Move IPI_IRQ into the driver
 - Remove irq_set_default_host() and use set_ipi_irq_mapping()
 - Change name with upstream feed-back
 - Change irq map, reserve soft_irq & private_irq space
 - Add License and Copyright
 - Support set_affinity for irq balance in SMP

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
---
 drivers/irqchip/Kconfig           |   9 ++
 drivers/irqchip/Makefile          |   1 +
 drivers/irqchip/irq-csky-mpintc.c | 198 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 208 insertions(+)
 create mode 100644 drivers/irqchip/irq-csky-mpintc.c

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 383e7b7..8103f6f 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -371,6 +371,15 @@ config QCOM_PDC
 	  Power Domain Controller driver to manage and configure wakeup
 	  IRQs for Qualcomm Technologies Inc (QTI) mobile chips.
 
+config CSKY_MPINTC
+	bool "C-SKY Multi Processor Interrupt Controller"
+	depends on CSKY
+	help
+	  Say yes here to enable C-SKY SMP interrupt controller driver used
+	  for C-SKY SMP system.
+	  In fact it's not mmio map in hw and it use ld/st to visit the
+	  controller's register inside CPU.
+
 endmenu
 
 config SIFIVE_PLIC
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index fbd1ec8..6b739ea 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -87,4 +87,5 @@ obj-$(CONFIG_MESON_IRQ_GPIO)		+= irq-meson-gpio.o
 obj-$(CONFIG_GOLDFISH_PIC) 		+= irq-goldfish-pic.o
 obj-$(CONFIG_NDS32)			+= irq-ativic32.o
 obj-$(CONFIG_QCOM_PDC)			+= qcom-pdc.o
+obj-$(CONFIG_CSKY_MPINTC)		+= irq-csky-mpintc.o
 obj-$(CONFIG_SIFIVE_PLIC)		+= irq-sifive-plic.o
diff --git a/drivers/irqchip/irq-csky-mpintc.c b/drivers/irqchip/irq-csky-mpintc.c
new file mode 100644
index 0000000..c67c961
--- /dev/null
+++ b/drivers/irqchip/irq-csky-mpintc.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/reg_ops.h>
+
+static struct irq_domain *root_domain;
+static void __iomem *INTCG_base;
+static void __iomem *INTCL_base;
+
+#define IPI_IRQ		15
+#define INTC_IRQS	256
+#define COMM_IRQ_BASE	32
+
+#define INTCG_SIZE	0x8000
+#define INTCL_SIZE	0x1000
+
+#define INTCG_ICTLR	0x0
+#define INTCG_CICFGR	0x100
+#define INTCG_CIDSTR	0x1000
+
+#define INTCL_PICTLR	0x0
+#define INTCL_SIGR	0x60
+#define INTCL_HPPIR	0x68
+#define INTCL_RDYIR	0x6c
+#define INTCL_SENR	0xa0
+#define INTCL_CENR	0xa4
+#define INTCL_CACR	0xb4
+
+static DEFINE_PER_CPU(void __iomem *, intcl_reg);
+
+static void csky_mpintc_handler(struct pt_regs *regs)
+{
+	void __iomem *reg_base = this_cpu_read(intcl_reg);
+
+	do {
+		handle_domain_irq(root_domain,
+				  readl_relaxed(reg_base + INTCL_RDYIR),
+				  regs);
+	} while (readl_relaxed(reg_base + INTCL_HPPIR) & BIT(31));
+}
+
+static void csky_mpintc_enable(struct irq_data *d)
+{
+	void __iomem *reg_base = this_cpu_read(intcl_reg);
+
+	writel_relaxed(d->hwirq, reg_base + INTCL_SENR);
+}
+
+static void csky_mpintc_disable(struct irq_data *d)
+{
+	void __iomem *reg_base = this_cpu_read(intcl_reg);
+
+	writel_relaxed(d->hwirq, reg_base + INTCL_CENR);
+}
+
+static void csky_mpintc_eoi(struct irq_data *d)
+{
+	void __iomem *reg_base = this_cpu_read(intcl_reg);
+
+	writel_relaxed(d->hwirq, reg_base + INTCL_CACR);
+}
+
+#ifdef CONFIG_SMP
+static int csky_irq_set_affinity(struct irq_data *d,
+				 const struct cpumask *mask_val,
+				 bool force)
+{
+	unsigned int cpu;
+	unsigned int offset = 4 * (d->hwirq - COMM_IRQ_BASE);
+
+	if (!force)
+		cpu = cpumask_any_and(mask_val, cpu_online_mask);
+	else
+		cpu = cpumask_first(mask_val);
+
+	if (cpu >= nr_cpu_ids)
+		return -EINVAL;
+
+	/* Enable interrupt destination */
+	cpu |= BIT(31);
+
+	writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset);
+
+	irq_data_update_effective_affinity(d, cpumask_of(cpu));
+
+	return IRQ_SET_MASK_OK_DONE;
+}
+#endif
+
+static struct irq_chip csky_irq_chip = {
+	.name           = "C-SKY SMP Intc",
+	.irq_eoi	= csky_mpintc_eoi,
+	.irq_enable	= csky_mpintc_enable,
+	.irq_disable	= csky_mpintc_disable,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = csky_irq_set_affinity,
+#endif
+};
+
+static int csky_irqdomain_map(struct irq_domain *d, unsigned int irq,
+			      irq_hw_number_t hwirq)
+{
+	if (hwirq < COMM_IRQ_BASE) {
+		irq_set_percpu_devid(irq);
+		irq_set_chip_and_handler(irq, &csky_irq_chip,
+					 handle_percpu_irq);
+	} else {
+		irq_set_chip_and_handler(irq, &csky_irq_chip,
+					 handle_fasteoi_irq);
+	}
+
+	return 0;
+}
+
+static const struct irq_domain_ops csky_irqdomain_ops = {
+	.map	= csky_irqdomain_map,
+	.xlate	= irq_domain_xlate_onecell,
+};
+
+#ifdef CONFIG_SMP
+static void csky_mpintc_send_ipi(const struct cpumask *mask)
+{
+	void __iomem *reg_base = this_cpu_read(intcl_reg);
+
+	/*
+	 * INTCL_SIGR[3:0] INTID
+	 * INTCL_SIGR[8:15] CPUMASK
+	 */
+	writel_relaxed((*cpumask_bits(mask)) << 8 | IPI_IRQ,
+					reg_base + INTCL_SIGR);
+}
+#endif
+
+/* C-SKY multi processor interrupt controller */
+static int __init
+csky_mpintc_init(struct device_node *node, struct device_node *parent)
+{
+	int ret;
+	unsigned int cpu, nr_irq;
+#ifdef CONFIG_SMP
+	unsigned int ipi_irq;
+#endif
+
+	if (parent)
+		return 0;
+
+	ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq);
+	if (ret < 0)
+		nr_irq = INTC_IRQS;
+
+	if (INTCG_base == NULL) {
+		INTCG_base = ioremap(mfcr("cr<31, 14>"),
+				     INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);
+		if (INTCG_base == NULL)
+			return -EIO;
+
+		INTCL_base = INTCG_base + INTCG_SIZE;
+
+		writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR);
+	}
+
+	root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops,
+					    NULL);
+	if (!root_domain)
+		return -ENXIO;
+
+	/* for every cpu */
+	for_each_present_cpu(cpu) {
+		per_cpu(intcl_reg, cpu) = INTCL_base + (INTCL_SIZE * cpu);
+		writel_relaxed(BIT(0), per_cpu(intcl_reg, cpu) + INTCL_PICTLR);
+	}
+
+	set_handle_irq(&csky_mpintc_handler);
+
+#ifdef CONFIG_SMP
+	ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
+	if (!ipi_irq)
+		return -EIO;
+
+	set_send_ipi(&csky_mpintc_send_ipi, ipi_irq);
+#endif
+
+	return 0;
+}
+IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init);
-- 
2.7.4

[PATCH V12 2/8] dt-bindings: interrupt-controller: C-SKY SMP intc

[Guo Ren]

Dt-bindings doc about C-SKY Multi-processors interrupt controller.

Changelog:
 - Should be: '#interrupt-cells' not 'interrupt-cells'

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/interrupt-controller/csky,mpintc.txt  | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
new file mode 100644
index 0000000..ab921f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
@@ -0,0 +1,40 @@
+===========================================
+C-SKY Multi-processors Interrupt Controller
+===========================================
+
+C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
+SMP soc, and it also could be used in non-SMP system.
+
+Interrupt number definition:
+
+  0-15  : software irq, and we use 15 as our IPI_IRQ.
+ 16-31  : private  irq, and we use 16 as the co-processor timer.
+ 31-1024: common irq for soc ip.
+
+=============================
+intc node bindings definition
+=============================
+
+	Description: Describes SMP interrupt controller
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,mpintc"
+	- #interrupt-cells
+		Usage: required
+		Value type: <u32>
+		Definition: must be <1>
+	- interrupt-controller:
+		Usage: required
+
+Examples:
+---------
+
+	intc: interrupt-controller {
+		compatible = "csky,mpintc";
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
-- 
2.7.4

[PATCH V12 3/8] irqchip: add C-SKY APB bus interrupt controller

[Guo Ren]

 - irq-csky-apb-intc is a simple SOC interrupt controller which is
   used in a lot of C-SKY CPU SOC products.

Changelog:
 - pass checkpatch.pl.
 - use "bool ret" instead of "int ret"
 - add support-pulse-signal in irq-csky-apb-intc.c
 - change name with upstream feed-back
 - add INTC_IFR to clear irq-pending
 - remove CSKY_VECIRQ_LEGENCY
 - change to generic irq chip framework
 - add License and Copyright
 - use irq_domain_add_linear instead of leagcy

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Mark Rutland <mark.rutland@arm.com>
---
 drivers/irqchip/Kconfig             |   8 ++
 drivers/irqchip/Makefile            |   1 +
 drivers/irqchip/irq-csky-apb-intc.c | 274 ++++++++++++++++++++++++++++++++++++
 3 files changed, 283 insertions(+)
 create mode 100644 drivers/irqchip/irq-csky-apb-intc.c

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 8103f6f..41cdca0 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -380,6 +380,14 @@ config CSKY_MPINTC
 	  In fact it's not mmio map in hw and it use ld/st to visit the
 	  controller's register inside CPU.
 
+config CSKY_APB_INTC
+	bool "C-SKY APB Interrupt Controller"
+	depends on CSKY
+	help
+	  Say yes here to enable C-SKY APB interrupt controller driver used
+	  by C-SKY single core SOC system. It use mmio map apb-bus to visit
+	  the controller's register.
+
 endmenu
 
 config SIFIVE_PLIC
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 6b739ea..72eaf53 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -88,4 +88,5 @@ obj-$(CONFIG_GOLDFISH_PIC) 		+= irq-goldfish-pic.o
 obj-$(CONFIG_NDS32)			+= irq-ativic32.o
 obj-$(CONFIG_QCOM_PDC)			+= qcom-pdc.o
 obj-$(CONFIG_CSKY_MPINTC)		+= irq-csky-mpintc.o
+obj-$(CONFIG_CSKY_APB_INTC)		+= irq-csky-apb-intc.o
 obj-$(CONFIG_SIFIVE_PLIC)		+= irq-sifive-plic.o
diff --git a/drivers/irqchip/irq-csky-apb-intc.c b/drivers/irqchip/irq-csky-apb-intc.c
new file mode 100644
index 0000000..2543bab
--- /dev/null
+++ b/drivers/irqchip/irq-csky-apb-intc.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+
+#define INTC_IRQS		64
+
+#define CK_INTC_ICR		0x00
+#define CK_INTC_PEN31_00	0x14
+#define CK_INTC_PEN63_32	0x2c
+#define CK_INTC_NEN31_00	0x10
+#define CK_INTC_NEN63_32	0x28
+#define CK_INTC_SOURCE		0x40
+#define CK_INTC_DUAL_BASE	0x100
+
+#define GX_INTC_PEN31_00	0x00
+#define GX_INTC_PEN63_32	0x04
+#define GX_INTC_NEN31_00	0x40
+#define GX_INTC_NEN63_32	0x44
+#define GX_INTC_NMASK31_00	0x50
+#define GX_INTC_NMASK63_32	0x54
+#define GX_INTC_SOURCE		0x60
+
+static void __iomem *reg_base;
+static struct irq_domain *root_domain;
+
+static int nr_irq = INTC_IRQS;
+
+/*
+ * When controller support pulse signal, the PEN_reg will hold on signal
+ * without software trigger.
+ *
+ * So, to support pulse signal we need to clear IFR_reg and the address of
+ * IFR_offset is NEN_offset - 8.
+ */
+static void irq_ck_mask_set_bit(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	unsigned long ifr = ct->regs.mask - 8;
+	u32 mask = d->mask;
+
+	irq_gc_lock(gc);
+	*ct->mask_cache |= mask;
+	irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask);
+	irq_reg_writel(gc, irq_reg_readl(gc, ifr) & ~mask, ifr);
+	irq_gc_unlock(gc);
+}
+
+static void __init ck_set_gc(struct device_node *node, void __iomem *reg_base,
+			     u32 mask_reg, u32 irq_base)
+{
+	struct irq_chip_generic *gc;
+
+	gc = irq_get_domain_generic_chip(root_domain, irq_base);
+	gc->reg_base = reg_base;
+	gc->chip_types[0].regs.mask = mask_reg;
+	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
+	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
+
+	if (of_find_property(node, "csky,support-pulse-signal", NULL))
+		gc->chip_types[0].chip.irq_unmask = irq_ck_mask_set_bit;
+}
+
+static inline u32 build_channel_val(u32 idx, u32 magic)
+{
+	u32 res;
+
+	/*
+	 * Set the same index for each channel
+	 */
+	res = idx | (idx << 8) | (idx << 16) | (idx << 24);
+
+	/*
+	 * Set the channel magic number in descending order.
+	 * The magic is 0x00010203 for ck-intc
+	 * The magic is 0x03020100 for gx6605s-intc
+	 */
+	return res | magic;
+}
+
+static inline void setup_irq_channel(u32 magic, void __iomem *reg_addr)
+{
+	u32 i;
+
+	/* Setup 64 channel slots */
+	for (i = 0; i < INTC_IRQS; i += 4)
+		writel_relaxed(build_channel_val(i, magic), reg_addr + i);
+}
+
+static int __init
+ck_intc_init_comm(struct device_node *node, struct device_node *parent)
+{
+	int ret;
+
+	if (parent) {
+		pr_err("C-SKY Intc not a root irq controller\n");
+		return -EINVAL;
+	}
+
+	reg_base = of_iomap(node, 0);
+	if (!reg_base) {
+		pr_err("C-SKY Intc unable to map: %p.\n", node);
+		return -EINVAL;
+	}
+
+	root_domain = irq_domain_add_linear(node, nr_irq,
+					    &irq_generic_chip_ops, NULL);
+	if (!root_domain) {
+		pr_err("C-SKY Intc irq_domain_add failed.\n");
+		return -ENOMEM;
+	}
+
+	ret = irq_alloc_domain_generic_chips(root_domain, 32, 1,
+			"csky_intc", handle_level_irq,
+			IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0);
+	if (ret) {
+		pr_err("C-SKY Intc irq_alloc_gc failed.\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static inline bool handle_irq_perbit(struct pt_regs *regs, u32 hwirq,
+				     u32 irq_base)
+{
+	u32 irq;
+
+	if (hwirq == 0)
+		return 0;
+
+	while (hwirq) {
+		irq = __ffs(hwirq);
+		hwirq &= ~BIT(irq);
+		handle_domain_irq(root_domain, irq_base + irq, regs);
+	}
+
+	return 1;
+}
+
+/* gx6605s 64 irqs interrupt controller */
+static void gx_irq_handler(struct pt_regs *regs)
+{
+	bool ret;
+
+	do {
+		ret  = handle_irq_perbit(regs,
+				readl_relaxed(reg_base + GX_INTC_PEN31_00), 0);
+		ret |= handle_irq_perbit(regs,
+				readl_relaxed(reg_base + GX_INTC_PEN63_32), 32);
+	} while (ret);
+}
+
+static int __init
+gx_intc_init(struct device_node *node, struct device_node *parent)
+{
+	int ret;
+
+	ret = ck_intc_init_comm(node, parent);
+	if (ret)
+		return ret;
+
+	/*
+	 * Initial enable reg to disable all interrupts
+	 */
+	writel_relaxed(0x0, reg_base + GX_INTC_NEN31_00);
+	writel_relaxed(0x0, reg_base + GX_INTC_NEN63_32);
+
+	/*
+	 * Initial mask reg with all unmasked, because we only use enalbe reg
+	 */
+	writel_relaxed(0x0, reg_base + GX_INTC_NMASK31_00);
+	writel_relaxed(0x0, reg_base + GX_INTC_NMASK63_32);
+
+	setup_irq_channel(0x03020100, reg_base + GX_INTC_SOURCE);
+
+	ck_set_gc(node, reg_base, GX_INTC_NEN31_00, 0);
+	ck_set_gc(node, reg_base, GX_INTC_NEN63_32, 32);
+
+	set_handle_irq(gx_irq_handler);
+
+	return 0;
+}
+IRQCHIP_DECLARE(csky_gx6605s_intc, "csky,gx6605s-intc", gx_intc_init);
+
+/*
+ * C-SKY simple 64 irqs interrupt controller, dual-together could support 128
+ * irqs.
+ */
+static void ck_irq_handler(struct pt_regs *regs)
+{
+	bool ret;
+	void __iomem *reg_pen_lo = reg_base + CK_INTC_PEN31_00;
+	void __iomem *reg_pen_hi = reg_base + CK_INTC_PEN63_32;
+
+	do {
+		/* handle 0 - 31 irqs */
+		ret  = handle_irq_perbit(regs, readl_relaxed(reg_pen_lo), 0);
+		ret |= handle_irq_perbit(regs, readl_relaxed(reg_pen_hi), 32);
+
+		if (nr_irq == INTC_IRQS)
+			continue;
+
+		/* handle 64 - 127 irqs */
+		ret |= handle_irq_perbit(regs,
+			readl_relaxed(reg_pen_lo + CK_INTC_DUAL_BASE), 64);
+		ret |= handle_irq_perbit(regs,
+			readl_relaxed(reg_pen_hi + CK_INTC_DUAL_BASE), 96);
+	} while (ret);
+}
+
+static int __init
+ck_intc_init(struct device_node *node, struct device_node *parent)
+{
+	int ret;
+
+	ret = ck_intc_init_comm(node, parent);
+	if (ret)
+		return ret;
+
+	/* Initial enable reg to disable all interrupts */
+	writel_relaxed(0, reg_base + CK_INTC_NEN31_00);
+	writel_relaxed(0, reg_base + CK_INTC_NEN63_32);
+
+	/* Enable irq intc */
+	writel_relaxed(BIT(31), reg_base + CK_INTC_ICR);
+
+	ck_set_gc(node, reg_base, CK_INTC_NEN31_00, 0);
+	ck_set_gc(node, reg_base, CK_INTC_NEN63_32, 32);
+
+	setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE);
+
+	set_handle_irq(ck_irq_handler);
+
+	return 0;
+}
+IRQCHIP_DECLARE(ck_intc, "csky,apb-intc", ck_intc_init);
+
+static int __init
+ck_dual_intc_init(struct device_node *node, struct device_node *parent)
+{
+	int ret;
+
+	/* dual-apb-intc up to 128 irq sources*/
+	nr_irq = INTC_IRQS * 2;
+
+	ret = ck_intc_init(node, parent);
+	if (ret)
+		return ret;
+
+	/* Initial enable reg to disable all interrupts */
+	writel_relaxed(0, reg_base + CK_INTC_NEN31_00 + CK_INTC_DUAL_BASE);
+	writel_relaxed(0, reg_base + CK_INTC_NEN63_32 + CK_INTC_DUAL_BASE);
+
+	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN31_00, 64);
+	ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN63_32, 96);
+
+	setup_irq_channel(0x00010203,
+			  reg_base + CK_INTC_SOURCE + CK_INTC_DUAL_BASE);
+
+	return 0;
+}
+IRQCHIP_DECLARE(ck_dual_intc, "csky,dual-apb-intc", ck_dual_intc_init);
-- 
2.7.4

[PATCH V12 4/8] dt-bindings: interrupt-controller: C-SKY APB intc

[Guo Ren]

 - Dt-bindings doc about C-SKY apb bus interrupt controller.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../interrupt-controller/csky,apb-intc.txt         | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
new file mode 100644
index 0000000..44286dc
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
@@ -0,0 +1,62 @@
+==============================
+C-SKY APB Interrupt Controller
+==============================
+
+C-SKY APB Interrupt Controller is a simple soc interrupt controller
+on the apb bus and we only use it as root irq controller.
+
+ - csky,apb-intc is used in a lot of csky fpgas and socs, it support 64 irq nums.
+ - csky,dual-apb-intc consists of 2 apb-intc and 128 irq nums supported.
+ - csky,gx6605s-intc is gx6605s soc internal irq interrupt controller, 64 irq nums.
+
+=============================
+intc node bindings definition
+=============================
+
+	Description: Describes APB interrupt controller
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,apb-intc"
+				    "csky,dual-apb-intc"
+				    "csky,gx6605s-intc"
+	- #interrupt-cells
+		Usage: required
+		Value type: <u32>
+		Definition: must be <1>
+	- reg
+		Usage: required
+		Value type: <u32 u32>
+		Definition: <phyaddr size> in soc from cpu view
+	- interrupt-controller:
+		Usage: required
+	- csky,support-pulse-signal:
+		Usage: select
+		Description: to support pulse signal flag
+
+Examples:
+---------
+
+	intc: interrupt-controller@500000 {
+		compatible = "csky,apb-intc";
+		#interrupt-cells = <1>;
+		reg = <0x00500000 0x400>;
+		interrupt-controller;
+	};
+
+	intc: interrupt-controller@500000 {
+		compatible = "csky,dual-apb-intc";
+		#interrupt-cells = <1>;
+		reg = <0x00500000 0x400>;
+		interrupt-controller;
+	};
+
+	intc: interrupt-controller@500000 {
+		compatible = "csky,gx6605s-intc";
+		#interrupt-cells = <1>;
+		reg = <0x00500000 0x400>;
+		interrupt-controller;
+	};
-- 
2.7.4

[PATCH V12 5/8] clocksource: add C-SKY SMP timer

[Guo Ren]

This timer is used by SMP system and use mfcr/mtcr instruction
to access the regs.

Changelog:
 - Add COMPILE_TEST
 - Fixup smp boot error, cpuhp_setup_state must after timer_of_init()
 - Add rollback for timer_of_cleanup.
 - Use request_percpu_irq separate from time_of.
 - Remove #define CPUHP_AP_CSKY_TIMER_STARTING.
 - Add CPUHP_AP_CSKY_TIMER_STARTING in cpuhotplug.h.
 - Support csky mp timer alpha version.
 - Just use low-counter with 32bit width as clocksource.
 - Coding convention with upstream feed-back.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/Kconfig         |  10 +++
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-mp-csky.c | 173 ++++++++++++++++++++++++++++++++++++
 include/linux/cpuhotplug.h          |   1 +
 4 files changed, 185 insertions(+)
 create mode 100644 drivers/clocksource/timer-mp-csky.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a11f4ba..591c9a8 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -620,4 +620,14 @@ config RISCV_TIMER
 	  is accessed via both the SBI and the rdcycle instruction.  This is
 	  required for all RISC-V systems.
 
+config CSKY_MP_TIMER
+	bool "SMP Timer for the C-SKY platform" if COMPILE_TEST
+	depends on CSKY
+	select TIMER_OF
+	help
+	  Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
+	  system.
+	  csky,mptimer is not only used in SMP system, it also could be used
+	  single core system. It's not a mmio reg and it use mtcr/mfcr instruction.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index db51b24..5ce82d3 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
 obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
+obj-$(CONFIG_CSKY_MP_TIMER)		+= timer-mp-csky.o
diff --git a/drivers/clocksource/timer-mp-csky.c b/drivers/clocksource/timer-mp-csky.c
new file mode 100644
index 0000000..a8acc43
--- /dev/null
+++ b/drivers/clocksource/timer-mp-csky.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+#include <linux/cpu.h>
+#include <linux/of_irq.h>
+#include <asm/reg_ops.h>
+
+#include "timer-of.h"
+
+#define PTIM_CCVR	"cr<3, 14>"
+#define PTIM_CTLR	"cr<0, 14>"
+#define PTIM_LVR	"cr<6, 14>"
+#define PTIM_TSR	"cr<1, 14>"
+
+static int csky_mptimer_irq;
+
+static int csky_mptimer_set_next_event(unsigned long delta,
+				       struct clock_event_device *ce)
+{
+	mtcr(PTIM_LVR, delta);
+
+	return 0;
+}
+
+static int csky_mptimer_shutdown(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 1);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static DEFINE_PER_CPU(struct timer_of, csky_to) = {
+	.flags					= TIMER_OF_CLOCK,
+	.clkevt = {
+		.rating				= 300,
+		.features			= CLOCK_EVT_FEAT_PERCPU |
+						  CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown		= csky_mptimer_shutdown,
+		.set_state_oneshot		= csky_mptimer_oneshot,
+		.set_state_oneshot_stopped	= csky_mptimer_oneshot_stopped,
+		.set_next_event			= csky_mptimer_set_next_event,
+	},
+};
+
+static irqreturn_t csky_timer_interrupt(int irq, void *dev)
+{
+	struct timer_of *to = this_cpu_ptr(&csky_to);
+
+	mtcr(PTIM_TSR, 0);
+
+	to->clkevt.event_handler(&to->clkevt);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * clock event for percpu
+ */
+static int csky_mptimer_starting_cpu(unsigned int cpu)
+{
+	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
+
+	to->clkevt.cpumask = cpumask_of(cpu);
+
+	clockevents_config_and_register(&to->clkevt, timer_of_rate(to),
+					2, ULONG_MAX);
+
+	enable_percpu_irq(csky_mptimer_irq, 0);
+
+	return 0;
+}
+
+static int csky_mptimer_dying_cpu(unsigned int cpu)
+{
+	disable_percpu_irq(csky_mptimer_irq);
+
+	return 0;
+}
+
+/*
+ * clock source
+ */
+static u64 sched_clock_read(void)
+{
+	return (u64)mfcr(PTIM_CCVR);
+}
+
+static u64 clksrc_read(struct clocksource *c)
+{
+	return (u64)mfcr(PTIM_CCVR);
+}
+
+struct clocksource csky_clocksource = {
+	.name	= "csky",
+	.rating	= 400,
+	.mask	= CLOCKSOURCE_MASK(32),
+	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
+	.read	= clksrc_read,
+};
+
+static int __init csky_mptimer_init(struct device_node *np)
+{
+	int ret, cpu, cpu_rollback;
+	struct timer_of *to = NULL;
+
+	/*
+	 * Csky_mptimer is designed for C-SKY SMP multi-processors and
+	 * every core has it's own private irq and regs for clkevt and
+	 * clksrc.
+	 *
+	 * The regs is accessed by cpu instruction: mfcr/mtcr instead of
+	 * mmio map style. So we needn't mmio-address in dts, but we still
+	 * need to give clk and irq number.
+	 *
+	 * We use private irq for the mptimer and irq number is the same
+	 * for every core. So we use request_percpu_irq() in timer_of_init.
+	 */
+	csky_mptimer_irq = irq_of_parse_and_map(np, 0);
+	if (csky_mptimer_irq <= 0)
+		return -EINVAL;
+
+	ret = request_percpu_irq(csky_mptimer_irq, csky_timer_interrupt,
+				 "csky_mp_timer", &csky_to);
+	if (ret)
+		return -EINVAL;
+
+	for_each_possible_cpu(cpu) {
+		to = per_cpu_ptr(&csky_to, cpu);
+		ret = timer_of_init(np, to);
+		if (ret)
+			goto rollback;
+	}
+
+	clocksource_register_hz(&csky_clocksource, timer_of_rate(to));
+	sched_clock_register(sched_clock_read, 32, timer_of_rate(to));
+
+	ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING,
+				"clockevents/csky/timer:starting",
+				csky_mptimer_starting_cpu,
+				csky_mptimer_dying_cpu);
+	if (ret)
+		return -EINVAL;
+
+	return 0;
+
+rollback:
+	for_each_possible_cpu(cpu_rollback) {
+		if (cpu_rollback == cpu)
+			break;
+
+		to = per_cpu_ptr(&csky_to, cpu_rollback);
+		timer_of_cleanup(to);
+	}
+	return -EINVAL;
+}
+TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index caf40ad..e0cd2ba 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -126,6 +126,7 @@ enum cpuhp_state {
 	CPUHP_AP_MIPS_GIC_TIMER_STARTING,
 	CPUHP_AP_ARC_TIMER_STARTING,
 	CPUHP_AP_RISCV_TIMER_STARTING,
+	CPUHP_AP_CSKY_TIMER_STARTING,
 	CPUHP_AP_KVM_STARTING,
 	CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
 	CPUHP_AP_KVM_ARM_VGIC_STARTING,
-- 
2.7.4

[PATCH V12 6/8] dt-bindings: timer: C-SKY Multi-processor timer

[Guo Ren]

Dt-bingdings doc for C-SKY SMP system setting.

Changelog:
 - Drop the interrupt-parent.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/timer/csky,mptimer.txt     | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/csky,mptimer.txt

diff --git a/Documentation/devicetree/bindings/timer/csky,mptimer.txt b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
new file mode 100644
index 0000000..15cfec0
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
@@ -0,0 +1,42 @@
+============================
+C-SKY Multi-processors Timer
+============================
+
+C-SKY multi-processors timer is designed for C-SKY SMP system and the
+regs is accessed by cpu co-processor 4 registers with mtcr/mfcr.
+
+ - PTIM_CTLR "cr<0, 14>" Control reg to start reset timer.
+ - PTIM_TSR  "cr<1, 14>" Interrupt cleanup status reg.
+ - PTIM_CCVR "cr<3, 14>" Current counter value reg.
+ - PTIM_LVR  "cr<6, 14>" Window value reg to triger next event.
+
+==============================
+timer node bindings definition
+==============================
+
+	Description: Describes SMP timer
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,mptimer"
+	- clocks
+		Usage: required
+		Value type: <node>
+		Definition: must be input clk node
+	- interrupts
+		Usage: required
+		Value type: <u32>
+		Definition: must be timer irq num defined by soc
+
+Examples:
+---------
+
+	timer: timer {
+		compatible = "csky,mptimer";
+		clocks = <&dummy_apb_clk>;
+		interrupts = <16>;
+		interrupt-parent = <&intc>;
+	};
-- 
2.7.4

[PATCH V12 7/8] clocksource: add gx6605s SOC system timer

[Guo Ren]

Changelog:
 - pass checkpatch.pl
 - Add COMIPLE_TEST in Kconfig
 - no cast is needed for "struct clock_event_device *ce = dev"
 - remove: extra space after (u64)
 - Add License and Copyright
 - Use timer-of framework
 - Change name with upstream feedback
 - Use clksource_mmio framework

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/Kconfig         |   8 ++
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-gx6605s.c | 154 ++++++++++++++++++++++++++++++++++++
 3 files changed, 163 insertions(+)
 create mode 100644 drivers/clocksource/timer-gx6605s.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 591c9a8..55c77e4 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -630,4 +630,12 @@ config CSKY_MP_TIMER
 	  csky,mptimer is not only used in SMP system, it also could be used
 	  single core system. It's not a mmio reg and it use mtcr/mfcr instruction.
 
+config GX6605S_TIMER
+	bool "Gx6605s SOC system timer driver" if COMPILE_TEST
+	depends on CSKY
+	select CLKSRC_MMIO
+	select TIMER_OF
+	help
+	  This option enables support for gx6605s SOC's timer.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 5ce82d3..9196331 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -80,3 +80,4 @@ obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
 obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
 obj-$(CONFIG_CSKY_MP_TIMER)		+= timer-mp-csky.o
+obj-$(CONFIG_GX6605S_TIMER)		+= timer-gx6605s.o
diff --git a/drivers/clocksource/timer-gx6605s.c b/drivers/clocksource/timer-gx6605s.c
new file mode 100644
index 0000000..80d0939
--- /dev/null
+++ b/drivers/clocksource/timer-gx6605s.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+
+#include "timer-of.h"
+
+#define CLKSRC_OFFSET	0x40
+
+#define TIMER_STATUS	0x00
+#define TIMER_VALUE	0x04
+#define TIMER_CONTRL	0x10
+#define TIMER_CONFIG	0x20
+#define TIMER_DIV	0x24
+#define TIMER_INI	0x28
+
+#define GX6605S_STATUS_CLR	BIT(0)
+#define GX6605S_CONTRL_RST	BIT(0)
+#define GX6605S_CONTRL_START	BIT(1)
+#define GX6605S_CONFIG_EN	BIT(0)
+#define GX6605S_CONFIG_IRQ_EN	BIT(1)
+
+static irqreturn_t gx6605s_timer_interrupt(int irq, void *dev)
+{
+	struct clock_event_device *ce = dev;
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	writel_relaxed(GX6605S_STATUS_CLR, base + TIMER_STATUS);
+
+	ce->event_handler(ce);
+
+	return IRQ_HANDLED;
+}
+
+static int gx6605s_timer_set_oneshot(struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	/* reset and stop counter */
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	/* enable with irq and start */
+	writel_relaxed(GX6605S_CONFIG_EN | GX6605S_CONFIG_IRQ_EN,
+		       base + TIMER_CONFIG);
+
+	return 0;
+}
+
+static int gx6605s_timer_set_next_event(unsigned long delta,
+					struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	/* use reset to pause timer */
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	/* config next timeout value */
+	writel_relaxed(ULONG_MAX - delta, base + TIMER_INI);
+	writel_relaxed(GX6605S_CONTRL_START, base + TIMER_CONTRL);
+
+	return 0;
+}
+
+static int gx6605s_timer_shutdown(struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	writel_relaxed(0, base + TIMER_CONTRL);
+	writel_relaxed(0, base + TIMER_CONFIG);
+
+	return 0;
+}
+
+static struct timer_of to = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
+	.clkevt = {
+		.rating			= 300,
+		.features		= CLOCK_EVT_FEAT_DYNIRQ |
+					  CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown	= gx6605s_timer_shutdown,
+		.set_state_oneshot	= gx6605s_timer_set_oneshot,
+		.set_next_event		= gx6605s_timer_set_next_event,
+		.cpumask		= cpu_possible_mask,
+	},
+	.of_irq = {
+		.handler		= gx6605s_timer_interrupt,
+		.flags			= IRQF_TIMER | IRQF_IRQPOLL,
+	},
+};
+
+static u64 notrace gx6605s_sched_clock_read(void)
+{
+	void __iomem *base;
+
+	base = timer_of_base(&to) + CLKSRC_OFFSET;
+
+	return (u64)readl_relaxed(base + TIMER_VALUE);
+}
+
+static void gx6605s_clkevt_init(void __iomem *base)
+{
+	writel_relaxed(0, base + TIMER_DIV);
+	writel_relaxed(0, base + TIMER_CONFIG);
+
+	clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 2,
+					ULONG_MAX);
+}
+
+static int gx6605s_clksrc_init(void __iomem *base)
+{
+	writel_relaxed(0, base + TIMER_DIV);
+	writel_relaxed(0, base + TIMER_INI);
+
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	writel_relaxed(GX6605S_CONFIG_EN, base + TIMER_CONFIG);
+
+	writel_relaxed(GX6605S_CONTRL_START, base + TIMER_CONTRL);
+
+	sched_clock_register(gx6605s_sched_clock_read, 32, timer_of_rate(&to));
+
+	return clocksource_mmio_init(base + TIMER_VALUE, "gx6605s",
+			timer_of_rate(&to), 200, 32, clocksource_mmio_readl_up);
+}
+
+static int __init gx6605s_timer_init(struct device_node *np)
+{
+	int ret;
+
+	/*
+	 * The timer driver is for nationalchip gx6605s SOC and there are two
+	 * same timer in gx6605s. We use one for clkevt and another for clksrc.
+	 *
+	 * The timer is mmio map to access, so we need give mmio address in dts.
+	 *
+	 * It provides a 32bit countup timer and interrupt will be caused by
+	 * count-overflow.
+	 * So we need set-next-event by ULONG_MAX - delta in TIMER_INI reg.
+	 *
+	 * The counter at 0x0  offset is clock event.
+	 * The counter at 0x40 offset is clock source.
+	 * They are the same in hardware, just different used by driver.
+	 */
+	ret = timer_of_init(np, &to);
+	if (ret)
+		return ret;
+
+	gx6605s_clkevt_init(timer_of_base(&to));
+
+	return gx6605s_clksrc_init(timer_of_base(&to) + CLKSRC_OFFSET);
+}
+TIMER_OF_DECLARE(csky_gx6605s_timer, "csky,gx6605s-timer", gx6605s_timer_init);
-- 
2.7.4

[PATCH V12 8/8] dt-bindings: timer: gx6605s SOC timer

[Guo Ren]

Dt-bindings doc for gx6605s SOC's system timer.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/timer/csky,gx6605s-timer.txt          | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt

diff --git a/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt b/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
new file mode 100644
index 0000000..6b04344
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
@@ -0,0 +1,42 @@
+=================
+gx6605s SOC Timer
+=================
+
+The timer is used in gx6605s soc as system timer and the driver
+contain clk event and clk source.
+
+==============================
+timer node bindings definition
+==============================
+
+	Description: Describes gx6605s SOC timer
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,gx6605s-timer"
+	- reg
+		Usage: required
+		Value type: <u32 u32>
+		Definition: <phyaddr size> in soc from cpu view
+	- clocks
+		Usage: required
+		Value type: phandle + clock specifier cells
+		Definition: must be input clk node
+	- interrupt
+		Usage: required
+		Value type: <u32>
+		Definition: must be timer irq num defined by soc
+
+Examples:
+---------
+
+	timer0: timer@20a000 {
+		compatible = "csky,gx6605s-timer";
+		reg = <0x0020a000 0x400>;
+		clocks = <&dummy_apb_clk>;
+		interrupts = <10>;
+		interrupt-parent = <&intc>;
+	};
-- 
2.7.4

Re: [PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[Daniel Lezcano]

On 12/10/2018 14:02, Guo Ren wrote:
> This is about 12th patchset for C-SKY linux drivers and it should pair
> with 8th kernel patchset.

Guo,

I'm willing to take your timer related patches but you have to put a
proper description.

  -- Daniel


> Changelog:
>  - Remove the set_irq_createmapping call back in csky-mp-intc.c.
>  - Convert the cpumask to an interrupt-controller specific representation
>    in driver's code, and not the SMP code's, and also modify the related
>    codes in csky kernel patchset.
>  - Add COMPILE_TEST for csky_mp_timer.
>  - Fixup smp boot error, cpuhp_setup_state must after timer_of_init()
>    for csky_mp_timer.
> 
> Any feedback is welcome, thx for all people review my patchset.
> 
> Guo Ren (8):
>   irqchip: add C-SKY SMP interrupt controller
>   dt-bindings: interrupt-controller: C-SKY SMP intc
>   irqchip: add C-SKY APB bus interrupt controller
>   dt-bindings: interrupt-controller: C-SKY APB intc
>   clocksource: add C-SKY SMP timer
>   dt-bindings: timer: C-SKY Multi-processor timer
>   clocksource: add gx6605s SOC system timer
>   dt-bindings: timer: gx6605s SOC timer
> 
>  .../interrupt-controller/csky,apb-intc.txt         |  62 +++++
>  .../bindings/interrupt-controller/csky,mpintc.txt  |  40 +++
>  .../bindings/timer/csky,gx6605s-timer.txt          |  42 ++++
>  .../devicetree/bindings/timer/csky,mptimer.txt     |  42 ++++
>  drivers/clocksource/Kconfig                        |  18 ++
>  drivers/clocksource/Makefile                       |   2 +
>  drivers/clocksource/timer-gx6605s.c                | 154 ++++++++++++
>  drivers/clocksource/timer-mp-csky.c                | 173 +++++++++++++
>  drivers/irqchip/Kconfig                            |  17 ++
>  drivers/irqchip/Makefile                           |   2 +
>  drivers/irqchip/irq-csky-apb-intc.c                | 274 +++++++++++++++++++++
>  drivers/irqchip/irq-csky-mpintc.c                  | 198 +++++++++++++++
>  include/linux/cpuhotplug.h                         |   1 +
>  13 files changed, 1025 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
>  create mode 100644 Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
>  create mode 100644 Documentation/devicetree/bindings/timer/csky,mptimer.txt
>  create mode 100644 drivers/clocksource/timer-gx6605s.c
>  create mode 100644 drivers/clocksource/timer-mp-csky.c
>  create mode 100644 drivers/irqchip/irq-csky-apb-intc.c
>  create mode 100644 drivers/irqchip/irq-csky-mpintc.c
> 


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Re: [PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[Guo Ren]

Hi Daniel,

Thx for reply and review.

On Sat, Oct 13, 2018 at 10:50:34PM +0200, Daniel Lezcano wrote:
> On 12/10/2018 14:02, Guo Ren wrote:
> > This is about 12th patchset for C-SKY linux drivers and it should pair
> > with 8th kernel patchset.
> 
> Guo,
> 
> I'm willing to take your timer related patches but you have to put a
> proper description.

Ok, I've improved all my comment for the drivers. Here is my modification:

commit 6b465856936cb8f7eda31b20eb59fb5c8a19d468
Author: Guo Ren <ren_guo@c-sky.com>
Date:   Tue Oct 2 16:43:18 2018 +0800

    clocksource: add gx6605s SOC system timer
    
    The driver is for gx6605s SOC system timer and there are two
    same timers in gx6605s. We use one for clkevt and another one for
    clksrc.
    
    The timer is mmio map to access, so we need give mmio address in dts.
    
    The counter at 0x0  offset is clock event.
    The counter at 0x40 offset is clock source.
    
    Changelog:
     - pass checkpatch.pl
     - Add COMIPLE_TEST in Kconfig
     - no cast is needed for "struct clock_event_device *ce = dev"
     - remove: extra space after (u64)
     - Add License and Copyright
     - Use timer-of framework
     - Change name with upstream feedback
     - Use clksource_mmio framework
    
    Signed-off-by: Guo Ren <ren_guo@c-sky.com>
    Cc: Daniel Lezcano <daniel.lezcano@linaro.org>

commit d89522b23ff8f2d5b6f33200db110c758d28ecc1
Author: Guo Ren <ren_guo@c-sky.com>
Date:   Wed Sep 5 14:25:24 2018 +0800

    clocksource: add C-SKY SMP timer
    
    The driver is for C-SKY SMP timer. It only support oneshot event
    and 32bit overflow for clocksource. Per cpu core has one timer and
    all timers share one clock-counter-input the same clocksource.
    
    This use mfcr&mtcr instructions to access the regs.
    
    Changelog:
     - Add COMPILE_TEST
     - Fixup smp boot error, cpuhp_setup_state must after timer_of_init()
     - Add rollback for timer_of_cleanup.
     - Use request_percpu_irq separate from time_of.
     - Remove #define CPUHP_AP_CSKY_TIMER_STARTING.
     - Add CPUHP_AP_CSKY_TIMER_STARTING in cpuhotplug.h.
     - Support csky mp timer alpha version.
     - Just use low-counter with 32bit width as clocksource.
     - Coding convention with upstream feed-back.
    
    Signed-off-by: Guo Ren <ren_guo@c-sky.com>
    Cc: Daniel Lezcano <daniel.lezcano@linaro.org>

===> It's interrupt controller comment, perhaps you won't care. <===

commit 65f4acd1df08c1c5ad1b0e8f46822b114c539f11
Author: Guo Ren <ren_guo@c-sky.com>
Date:   Sun Sep 16 15:57:14 2018 +0800

    irqchip: add C-SKY APB bus interrupt controller
    
    The driver is for C-SKY APB bus interrupt controller. It's a simple
    interrupt controller which use pending reg to detect the irq and use
    enable/disable reg to mask/unmask interrupt sources.
    
    A lot of SOCs based on C-SKY CPU use the interrupt controller as root
    controller.
    
    Changelog:
     - pass checkpatch.pl.
     - use "bool ret" instead of "int ret"
     - add support-pulse-signal in irq-csky-apb-intc.c
     - change name with upstream feed-back
     - add INTC_IFR to clear irq-pending
     - remove CSKY_VECIRQ_LEGENCY
     - change to generic irq chip framework
     - add License and Copyright
     - use irq_domain_add_linear instead of leagcy
    
    Signed-off-by: Guo Ren <ren_guo@c-sky.com>
    Cc: Mark Rutland <mark.rutland@arm.com>

commit ef790431a885d37766200c7968d47370ed8be251
Author: Guo Ren <ren_guo@c-sky.com>
Date:   Sun Sep 16 15:57:14 2018 +0800

    irqchip: add C-SKY SMP interrupt controller
    
    The driver is for C-SKY SMP interrupt controller. It support 16
    soft-irqs, 16 private-irqs, and 992 max external-irqs, a total of
    1024 interrupts.
    
    C-SKY CPU 807/810/860 SMP/non-SMP could use it.
    
    Changelog:
     - Remove set_ipi_irq_mapping.
     - Convert the cpumask to an interrupt-controller specific representation
       in driver's code, and not the SMP code's.
     - pass checkpatch.pl
     - Move IPI_IRQ into the driver
     - Remove irq_set_default_host() and use set_ipi_irq_mapping()
     - Change name with upstream feed-back
     - Change irq map, reserve soft_irq & private_irq space
     - Add License and Copyright
     - Support set_affinity for irq balance in SMP
    
    Signed-off-by: Guo Ren <ren_guo@c-sky.com>
    Cc: Marc Zyngier <marc.zyngier@arm.com>

Best Regards
 Guo Ren

Re: [PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[Daniel Lezcano]

On 14/10/2018 18:26, Guo Ren wrote:
> Hi Daniel,
> 
> Thx for reply and review.
> 
> On Sat, Oct 13, 2018 at 10:50:34PM +0200, Daniel Lezcano wrote:
>> On 12/10/2018 14:02, Guo Ren wrote:
>>> This is about 12th patchset for C-SKY linux drivers and it should pair
>>> with 8th kernel patchset.
>>
>> Guo,
>>
>> I'm willing to take your timer related patches but you have to put a
>> proper description.
> 
> Ok, I've improved all my comment for the drivers. Here is my modification:

Thanks Guo,

the descriptions look ok for the timer part. Can you resend the DT
bindings + timers patches separately with the commit log updated ?

When you add the Changelog you have to insert it *after* the first
'---', so when the patch is git applied, the change log will be
discarded and won't appear in git.

eg.

commit 6b465856936cb8f7eda31b20eb59fb5c8a19d468
Author: Guo Ren <ren_guo@c-sky.com>
Date:   Tue Oct 2 16:43:18 2018 +0800

clocksource: add gx6605s SOC system timer

The driver is for gx6605s SOC system timer and there are two
same timers in gx6605s. We use one for clkevt and another one for
clksrc.

The timer is mmio map to access, so we need give mmio address in dts.
The counter at 0x0  offset is clock event. The counter at 0x40 offset is
clock source.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
---
Changelog:
     - pass checkpatch.pl
     - Add COMIPLE_TEST in Kconfig
     - no cast is needed for "struct clock_event_device *ce = dev"
     - remove: extra space after (u64)
     - Add License and Copyright
     - Use timer-of framework
     - Change name with upstream feedback
     - Use clksource_mmio framework
---


Thanks

  -- Daniel




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Re: [PATCH V12 0/8] C-SKY(csky) Linux Kernel Driver

[Guo Ren]

Hi Daniel,

On Sun, Oct 14, 2018 at 10:38:36PM +0200, Daniel Lezcano wrote:
> On 14/10/2018 18:26, Guo Ren wrote:
> Thanks Guo,
> 
> the descriptions look ok for the timer part. Can you resend the DT
> bindings + timers patches separately with the commit log updated ?
Ok, immediately.

> 
> When you add the Changelog you have to insert it *after* the first
> '---', so when the patch is git applied, the change log will be
> discarded and won't appear in git.
Ok, thx for the tips.

> 
> eg.
> 
> commit 6b465856936cb8f7eda31b20eb59fb5c8a19d468
> Author: Guo Ren <ren_guo@c-sky.com>
> Date:   Tue Oct 2 16:43:18 2018 +0800
> 
> clocksource: add gx6605s SOC system timer
> 
> The driver is for gx6605s SOC system timer and there are two
> same timers in gx6605s. We use one for clkevt and another one for
> clksrc.
> 
> The timer is mmio map to access, so we need give mmio address in dts.
> The counter at 0x0  offset is clock event. The counter at 0x40 offset is
> clock source.
> 
> Signed-off-by: Guo Ren <ren_guo@c-sky.com>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> Changelog:
>      - pass checkpatch.pl
>      - Add COMIPLE_TEST in Kconfig
>      - no cast is needed for "struct clock_event_device *ce = dev"
>      - remove: extra space after (u64)
>      - Add License and Copyright
>      - Use timer-of framework
>      - Change name with upstream feedback
>      - Use clksource_mmio framework
> ---

Best Regards
 Guo Ren