[PATCH v4 13/22] sh: irqchip: SH7751 IRQCHIP Driver
From: Yoshinori Sato
Date: Wed Jun 29 2016 - 10:03:09 EST
Changes v4
- update example
Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
.../interrupt-controller/renesas,sh7751-intc.txt | 25 ++++
arch/sh/Kconfig | 6 +-
arch/sh/boards/Kconfig | 1 +
drivers/irqchip/Kconfig | 5 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-renesas-sh7751.c | 141 +++++++++++++++++++++
6 files changed, 176 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,sh7751-intc.txt
create mode 100644 drivers/irqchip/irq-renesas-sh7751.c
diff --git a/Documentation/devicetree/bindings/interrupt-controller/renesas,sh7751-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/renesas,sh7751-intc.txt
new file mode 100644
index 0000000..2bc6f22f
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,sh7751-intc.txt
@@ -0,0 +1,23 @@
+DT bindings for the SH7751 interrupt controller
+
+Required properties:
+
+ - compatible: has to be "renesas,sh7751-intc".
+
+ - reg: Base address and length of interrupt controller register
+ and extend register.
+
+ - interrupt-controller: Identifies the node as an interrupt controller.
+
+ - #interrupt-cells: has to be <2>: an interrupt index and flags, as defined
+ in interrupts.txt in this directory.
+
+Example
+-------
+
+ shintc: interrupt-controller@ffd00000 {
+ compatible = "renesas,sh7751-intc";
+ #interrupt-cells = <2>;
+ interrupt-controller;
+ reg = <0xffd00000 14>, <0xfe080000 128>;
+ };
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d06cac1..fee4333 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -29,7 +29,7 @@ config SUPERH
select ARCH_WANT_IPC_PARSE_VERSION
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_REGS_AND_STACK_ACCESS_API
- select MAY_HAVE_SPARSE_IRQ
+ select MAY_HAVE_SPARSE_IRQ if !SH_DEVICE_TREE
select IRQ_FORCED_THREADING
select RTC_LIB
select GENERIC_ATOMIC64
@@ -69,7 +69,7 @@ config SUPERH32
select HAVE_MIXED_BREAKPOINTS_REGS
select PERF_EVENTS
select ARCH_HIBERNATION_POSSIBLE if MMU
- select SPARSE_IRQ
+ select SPARSE_IRQ if !SH_DEVICE_TREE
select HAVE_CC_STACKPROTECTOR
config SUPERH64
@@ -863,7 +863,7 @@ config PCI
depends on SYS_SUPPORTS_PCI
select PCI_DOMAINS
select GENERIC_PCI_IOMAP
- select NO_GENERIC_PCI_IOPORT_MAP
+ select NO_GENERIC_PCI_IOPORT_MAP if !SH_DEVICE_TREE
help
Find out whether you have a PCI motherboard. PCI is the name of a
bus system, i.e. the way the CPU talks to the other stuff inside
diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig
index cfde921..d33ae46 100644
--- a/arch/sh/boards/Kconfig
+++ b/arch/sh/boards/Kconfig
@@ -15,6 +15,7 @@ config SH_DEVICE_TREE
select GENERIC_IOMAP
select COMMON_CLK
select SYS_SUPPORTS_PCI
+ select GENERIC_IRQ_CHIP
help
Select Board Described by Device Tree to build a kernel that
does not hard-code any board-specific knowledge but instead uses
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index fa33c50..fd7f842 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -251,6 +251,11 @@ config LS_SCFG_MSI
depends on PCI && PCI_MSI
select PCI_MSI_IRQ_DOMAIN
+config RENESAS_SH_INTC
+ def_bool y if SH_DEVICE_TREE
+ select IRQ_DOMAIN
+ select IRQ_DOMAIN_HIERARCHY
+
config PARTITION_PERCPU
bool
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 38853a1..2ab5735 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -69,3 +69,4 @@ obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o
obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o
obj-$(CONFIG_LS_SCFG_MSI) += irq-ls-scfg-msi.o
obj-$(CONFIG_EZNPS_GIC) += irq-eznps.o
+obj-$(CONFIG_RENESAS_SH_INTC) += irq-renesas-sh7751.o
diff --git a/drivers/irqchip/irq-renesas-sh7751.c b/drivers/irqchip/irq-renesas-sh7751.c
new file mode 100644
index 0000000..1710978
--- /dev/null
+++ b/drivers/irqchip/irq-renesas-sh7751.c
@@ -0,0 +1,141 @@
+/*
+ * SH7751 interrupt contoller driver
+ *
+ * Copyright 2016 Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of.h>
+#include <linux/io.h>
+
+static struct sh7751_intc_regs {
+ void *icr;
+ void *ipr;
+ void *intpri00;
+ void *intreq00;
+ void *intmsk00;
+ void *intmskclr00;
+} sh7751_regs;
+
+static const unsigned int ipr_table[] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0 - 7 */
+ 0x41, 0xff, 0xff, 0x40, 0xff, 0xff, 0xff, 0xff, /* 8 - 15 */
+ 0x03, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x11, /* 16 - 23 */
+ 0x11, 0x11, 0x11, 0x13, 0x12, 0x12, 0xff, 0xff, /* 24 - 31 */
+ 0x30, 0x33, 0x32, 0x32, 0x32, 0x32, 0x32, 0x21, /* 32 - 39 */
+ 0x21, 0x21, 0x21, 0x21, 0x32, 0x32, 0x32, 0x32, /* 40 - 47 */
+ 0xff, 0xff, 0xff, 0x40, 0xff, 0xff, 0xff, 0xff, /* 48 - 55 */
+ 0xff, 0xff, 0xff, 0x40, 0xff, 0xff, 0xff, 0xff, /* 56 - 63 */
+};
+
+static const unsigned int pri_table[] = {
+ 0, 4, 4, 4, 4, 4, 4, 4,
+ 8, 32, 32, 32, 12, 32, 32, 32,
+};
+
+static void sh_disable_irq(struct irq_data *data)
+{
+ int pos;
+ unsigned int addr;
+ unsigned long pri;
+ int irq = data->irq;
+ struct sh7751_intc_regs *reg = data->chip_data;
+
+ if (irq < 64) {
+ if (ipr_table[irq] != 0xff) {
+ addr = (ipr_table[irq] & 0xf0) >> 2;
+ pos = (ipr_table[irq] & 0x0f) << 4;
+ pri = ~(0x000f << pos);
+ pri &= __raw_readw(reg->ipr + addr);
+ __raw_writew(pri, reg->ipr + addr);
+ }
+ } else {
+ if (pri_table[irq - 64] < 32) {
+ pos = pri_table[irq - 64];
+ pri = ~(0x000f << pos);
+ pri &= __raw_readw(reg->intpri00);
+ __raw_writew(pri, reg->intpri00);
+ }
+ }
+}
+
+static void sh_enable_irq(struct irq_data *data)
+{
+ int pos;
+ unsigned int addr;
+ unsigned long pri;
+ int irq = data->irq;
+ struct sh7751_intc_regs *reg = data->chip_data;
+
+ if (irq < 64) {
+ if (ipr_table[irq] != 0xff) {
+ addr = (ipr_table[irq] & 0xf0) >> 2;
+ pos = (ipr_table[irq] & 0x0f) * 4;
+ pri = ~(0x000f << pos);
+ pri &= __raw_readw(reg->ipr + addr);
+ pri |= 1 << pos;
+ __raw_writew(pri, reg->ipr + addr);
+ }
+ } else {
+ if (pri_table[irq - 64] < 32) {
+ pos = pri_table[irq - 64];
+ pri = ~(0x000f << pos);
+ pri &= __raw_readw(reg->intpri00);
+ pri |= 1 << pos;
+ __raw_writew(pri, reg->intpri00);
+ }
+ }
+}
+
+static struct irq_chip sh_irq_chip = {
+ .name = "SH-IPR",
+ .irq_unmask = sh_enable_irq,
+ .irq_mask = sh_disable_irq,
+};
+
+static __init int irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw_irq_num)
+{
+ irq_set_chip_and_handler(virq, &sh_irq_chip, handle_level_irq);
+ irq_get_irq_data(virq)->chip_data = h->host_data;
+ irq_modify_status(virq, IRQ_NOREQUEST, IRQ_NOPROBE);
+
+ return 0;
+}
+
+static struct irq_domain_ops irq_ops = {
+ .map = irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static int __init sh_intc_7751_init(struct device_node *intc,
+ struct device_node *parent)
+{
+ struct irq_domain *domain;
+ void *intc_baseaddr;
+ void *intc_baseaddr2;
+
+ intc_baseaddr = of_iomap(intc, 0);
+ intc_baseaddr2 = of_iomap(intc, 1);
+ if (!intc_baseaddr || !intc_baseaddr2)
+ panic("INTC regsiter not defined");
+
+ sh7751_regs.icr = intc_baseaddr;
+ sh7751_regs.ipr = intc_baseaddr + 4;
+ sh7751_regs.intpri00 = intc_baseaddr2;
+ sh7751_regs.intreq00 = intc_baseaddr2 + 0x20;
+ sh7751_regs.intmsk00 = intc_baseaddr2 + 0x40;
+ sh7751_regs.intmskclr00 = intc_baseaddr2 + 0x60;
+
+ domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, &sh7751_regs);
+ if (!domain)
+ panic("%s: unable to create IRQ domain\n", intc->full_name);
+
+ irq_set_default_host(domain);
+ return 0;
+}
+
+IRQCHIP_DECLARE(sh_7751_intc, "renesas,sh7751-intc", sh_intc_7751_init);
--
2.7.0