| Message ID | 20200325022916.106641-2-jiaxun.yang@flygoat.com |
|---|---|
| State | Not Applicable |
| Delegated to: | David Miller |
| Headers | show |
| Series | [v7,01/12] irqchip: Add driver for Loongson I/O Local Interrupt Controller | expand |
Hi Jiaxun, Le mer. 25 mars 2020 à 10:28, Jiaxun Yang <jiaxun.yang@flygoat.com> a écrit : > This controller appeared on Loongson family of chips as the primary > package interrupt source. > > Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> > Co-developed-by: Huacai Chen <chenhc@lemote.com> > Signed-off-by: Huacai Chen <chenhc@lemote.com> > Reviewed-by: Marc Zyngier <maz@kernel.org> > --- > v4-v5: > Resolve suggestions from maz: > - Remove DT validation > - Simplify unnucessary functions & variables > --- > drivers/irqchip/Kconfig | 9 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-loongson-liointc.c | 261 > +++++++++++++++++++++++++ > 3 files changed, 271 insertions(+) > create mode 100644 drivers/irqchip/irq-loongson-liointc.c > > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig > index 6d397732138d..c609eaa319d2 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -513,4 +513,13 @@ config EXYNOS_IRQ_COMBINER > Say yes here to add support for the IRQ combiner devices embedded > in Samsung Exynos chips. > > +config LOONGSON_LIOINTC > + bool "Loongson Local I/O Interrupt Controller" > + depends on MACH_LOONGSON64 > + default y > + select IRQ_DOMAIN > + select GENERIC_IRQ_CHIP > + help > + Support for the Loongson Local I/O Interrupt Controller. > + > endmenu > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index eae0d78cbf22..5e7678efdfe6 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -105,3 +105,4 @@ obj-$(CONFIG_MADERA_IRQ) += irq-madera.o > obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o > obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o > obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o > +obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o > diff --git a/drivers/irqchip/irq-loongson-liointc.c > b/drivers/irqchip/irq-loongson-liointc.c > new file mode 100644 > index 000000000000..18de2c09ece4 > --- /dev/null > +++ b/drivers/irqchip/irq-loongson-liointc.c > @@ -0,0 +1,261 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com> > + * Loongson Local IO Interrupt Controller support > + */ > + > +#include <linux/errno.h> > +#include <linux/init.h> > +#include <linux/types.h> > +#include <linux/interrupt.h> > +#include <linux/ioport.h> > +#include <linux/irqchip.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > +#include <linux/io.h> > +#include <linux/smp.h> > +#include <linux/irqchip/chained_irq.h> > + > +#include <boot_param.h> > + > +#define LIOINTC_CHIP_IRQ 32 > +#define LIOINTC_NUM_PARENT 4 > + > +#define LIOINTC_INTC_CHIP_START 0x20 > + > +#define LIOINTC_REG_INTC_STATUS (LIOINTC_INTC_CHIP_START + 0x20) > +#define LIOINTC_REG_INTC_EN_STATUS (LIOINTC_INTC_CHIP_START + 0x04) > +#define LIOINTC_REG_INTC_ENABLE (LIOINTC_INTC_CHIP_START + 0x08) > +#define LIOINTC_REG_INTC_DISABLE (LIOINTC_INTC_CHIP_START + 0x0c) > +#define LIOINTC_REG_INTC_POL (LIOINTC_INTC_CHIP_START + 0x10) > +#define LIOINTC_REG_INTC_EDGE (LIOINTC_INTC_CHIP_START + 0x14) > + > +#define LIOINTC_SHIFT_INTx 4 > + > +struct liointc_handler_data { > + struct liointc_priv *priv; > + u32 parent_int_map; > +}; > + > +struct liointc_priv { > + struct irq_chip_generic *gc; > + struct liointc_handler_data handler[LIOINTC_NUM_PARENT]; > + u8 map_cache[LIOINTC_CHIP_IRQ]; > +}; > + > +static void liointc_chained_handle_irq(struct irq_desc *desc) > +{ > + struct liointc_handler_data *handler = > irq_desc_get_handler_data(desc); > + struct irq_chip *chip = irq_desc_get_chip(desc); > + struct irq_chip_generic *gc = handler->priv->gc; > + u32 pending; > + > + chained_irq_enter(chip, desc); > + > + pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS); > + > + if (!pending) > + spurious_interrupt(); > + > + while (pending) { > + int bit = __ffs(pending); > + > + generic_handle_irq(irq_find_mapping(gc->domain, bit)); > + pending &= ~BIT(bit); > + } Consider using the for_each_set_bit() macro from <linux/bitops.h>. See drivers/irqchip/irq-ingenic-tcu.c for instance. > + > + chained_irq_exit(chip, desc); > +} > + > +static void liointc_set_bit(struct irq_chip_generic *gc, > + unsigned int offset, > + u32 mask, bool set) > +{ > + if (set) > + writel(readl(gc->reg_base + offset) | mask, > + gc->reg_base + offset); > + else > + writel(readl(gc->reg_base + offset) & ~mask, > + gc->reg_base + offset); > +} > + > +static int liointc_set_type(struct irq_data *data, unsigned int type) > +{ > + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); > + u32 mask = data->mask; > + unsigned long flags; > + > + irq_gc_lock_irqsave(gc, flags); > + switch (type) { > + case IRQ_TYPE_LEVEL_HIGH: > + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false); > + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true); > + break; > + case IRQ_TYPE_LEVEL_LOW: > + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false); > + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false); > + break; > + case IRQ_TYPE_EDGE_RISING: > + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true); > + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true); > + break; > + case IRQ_TYPE_EDGE_FALLING: > + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true); > + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false); > + break; > + default: > + return -EINVAL; > + } > + irq_gc_unlock_irqrestore(gc, flags); > + > + irqd_set_trigger_type(data, type); > + return 0; > +} > + > +static void liointc_resume(struct irq_chip_generic *gc) > +{ > + struct liointc_priv *priv = gc->private; > + unsigned long flags; > + int i; > + > + irq_gc_lock_irqsave(gc, flags); > + /* Disable all at first */ > + writel(0xffffffff, gc->reg_base + LIOINTC_REG_INTC_DISABLE); > + /* Revert map cache */ > + for (i = 0; i < LIOINTC_CHIP_IRQ; i++) > + writeb(priv->map_cache[i], gc->reg_base + i); > + /* Revert mask cache */ > + writel(~gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE); > + irq_gc_unlock_irqrestore(gc, flags); > +} > + > +static const char * const parent_names[] = {"int0", "int1", "int2", > "int3"}; > + > +int __init liointc_of_init(struct device_node *node, > + struct device_node *parent) > +{ > + struct irq_chip_generic *gc; > + struct irq_domain *domain; > + struct irq_chip_type *ct; > + struct liointc_priv *priv; > + void __iomem *base; > + u32 of_parent_int_map[LIOINTC_NUM_PARENT]; > + int parent_irq[LIOINTC_NUM_PARENT]; > + bool have_parent = FALSE; > + int sz, i, err = 0; > + > + priv = kzalloc(sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + base = of_iomap(node, 0); > + if (!base) { > + err = -ENODEV; > + goto out_free_priv; > + } > + > + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { > + parent_irq[i] = of_irq_get_byname(node, parent_names[i]); > + if (parent_irq[i] > 0) > + have_parent = TRUE; > + } > + if (!have_parent) { > + err = -ENODEV; > + goto out_iounmap; > + } > + > + sz = of_property_read_variable_u32_array(node, > + "loongson,parent_int_map", > + &of_parent_int_map[0], > + LIOINTC_NUM_PARENT, > + LIOINTC_NUM_PARENT); > + if (sz < 4) { > + pr_err("loongson-liointc: No parent_int_map\n"); > + err = -ENODEV; > + goto out_iounmap; > + } > + > + for (i = 0; i < LIOINTC_NUM_PARENT; i++) > + priv->handler[i].parent_int_map = of_parent_int_map[i]; > + > + /* Setup IRQ domain */ > + domain = irq_domain_add_linear(node, 32, > + &irq_generic_chip_ops, priv); > + if (!domain) { > + pr_err("loongson-liointc: cannot add IRQ domain\n"); > + err = -EINVAL; > + goto out_iounmap; > + } > + > + err = irq_alloc_domain_generic_chips(domain, 32, 1, > + node->full_name, handle_level_irq, > + IRQ_NOPROBE, 0, 0); > + if (err) { > + pr_err("loongson-liointc: unable to register IRQ domain\n"); > + goto out_free_domain; > + } > + > + > + /* Disable all IRQs */ > + writel(0xffffffff, base + LIOINTC_REG_INTC_DISABLE); > + /* Set to level triggered */ > + writel(0x0, base + LIOINTC_REG_INTC_EDGE); > + > + /* Generate parent INT part of map cache */ > + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { > + u32 pending = priv->handler[i].parent_int_map; > + > + while (pending) { > + int bit = __ffs(pending); > + > + priv->map_cache[bit] = BIT(i) << LIOINTC_SHIFT_INTx; > + pending &= ~BIT(bit); > + } Same here. -Paul > + } > + > + for (i = 0; i < LIOINTC_CHIP_IRQ; i++) { > + /* Generate core part of map cache */ > + priv->map_cache[i] |= BIT(loongson_sysconf.boot_cpu_id); > + writeb(priv->map_cache[i], base + i); > + } > + > + gc = irq_get_domain_generic_chip(domain, 0); > + gc->private = priv; > + gc->reg_base = base; > + gc->domain = domain; > + gc->resume = liointc_resume; > + > + ct = gc->chip_types; > + ct->regs.enable = LIOINTC_REG_INTC_ENABLE; > + ct->regs.disable = LIOINTC_REG_INTC_DISABLE; > + ct->chip.irq_unmask = irq_gc_unmask_enable_reg; > + ct->chip.irq_mask = irq_gc_mask_disable_reg; > + ct->chip.irq_mask_ack = irq_gc_mask_disable_reg; > + ct->chip.irq_set_type = liointc_set_type; > + > + gc->mask_cache = 0xffffffff; > + priv->gc = gc; > + > + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { > + if (parent_irq[i] <= 0) > + continue; > + > + priv->handler[i].priv = priv; > + irq_set_chained_handler_and_data(parent_irq[i], > + liointc_chained_handle_irq, &priv->handler[i]); > + } > + > + return 0; > + > +out_free_domain: > + irq_domain_remove(domain); > +out_iounmap: > + iounmap(base); > +out_free_priv: > + kfree(priv); > + > + return err; > +} > + > +IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", > liointc_of_init); > +IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", > liointc_of_init); > -- > 2.26.0.rc2 > >
On 2020-03-25 11:25, Paul Cercueil wrote: > Hi Jiaxun, > > > Le mer. 25 mars 2020 à 10:28, Jiaxun Yang <jiaxun.yang@flygoat.com> a > écrit : >> This controller appeared on Loongson family of chips as the primary >> package interrupt source. >> >> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> >> Co-developed-by: Huacai Chen <chenhc@lemote.com> >> Signed-off-by: Huacai Chen <chenhc@lemote.com> >> Reviewed-by: Marc Zyngier <maz@kernel.org> >> --- >> v4-v5: >> Resolve suggestions from maz: >> - Remove DT validation >> - Simplify unnucessary functions & variables >> --- >> drivers/irqchip/Kconfig | 9 + >> drivers/irqchip/Makefile | 1 + >> drivers/irqchip/irq-loongson-liointc.c | 261 >> +++++++++++++++++++++++++ >> 3 files changed, 271 insertions(+) >> create mode 100644 drivers/irqchip/irq-loongson-liointc.c >> >> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig >> index 6d397732138d..c609eaa319d2 100644 >> --- a/drivers/irqchip/Kconfig >> +++ b/drivers/irqchip/Kconfig >> @@ -513,4 +513,13 @@ config EXYNOS_IRQ_COMBINER >> Say yes here to add support for the IRQ combiner devices embedded >> in Samsung Exynos chips. >> >> +config LOONGSON_LIOINTC >> + bool "Loongson Local I/O Interrupt Controller" >> + depends on MACH_LOONGSON64 >> + default y >> + select IRQ_DOMAIN >> + select GENERIC_IRQ_CHIP >> + help >> + Support for the Loongson Local I/O Interrupt Controller. >> + >> endmenu >> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile >> index eae0d78cbf22..5e7678efdfe6 100644 >> --- a/drivers/irqchip/Makefile >> +++ b/drivers/irqchip/Makefile >> @@ -105,3 +105,4 @@ obj-$(CONFIG_MADERA_IRQ) += irq-madera.o >> obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o >> obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o >> obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o >> +obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o >> diff --git a/drivers/irqchip/irq-loongson-liointc.c >> b/drivers/irqchip/irq-loongson-liointc.c >> new file mode 100644 >> index 000000000000..18de2c09ece4 >> --- /dev/null >> +++ b/drivers/irqchip/irq-loongson-liointc.c >> @@ -0,0 +1,261 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com> >> + * Loongson Local IO Interrupt Controller support >> + */ >> + >> +#include <linux/errno.h> >> +#include <linux/init.h> >> +#include <linux/types.h> >> +#include <linux/interrupt.h> >> +#include <linux/ioport.h> >> +#include <linux/irqchip.h> >> +#include <linux/of_address.h> >> +#include <linux/of_irq.h> >> +#include <linux/io.h> >> +#include <linux/smp.h> >> +#include <linux/irqchip/chained_irq.h> >> + >> +#include <boot_param.h> >> + >> +#define LIOINTC_CHIP_IRQ 32 >> +#define LIOINTC_NUM_PARENT 4 >> + >> +#define LIOINTC_INTC_CHIP_START 0x20 >> + >> +#define LIOINTC_REG_INTC_STATUS (LIOINTC_INTC_CHIP_START + 0x20) >> +#define LIOINTC_REG_INTC_EN_STATUS (LIOINTC_INTC_CHIP_START + 0x04) >> +#define LIOINTC_REG_INTC_ENABLE (LIOINTC_INTC_CHIP_START + 0x08) >> +#define LIOINTC_REG_INTC_DISABLE (LIOINTC_INTC_CHIP_START + 0x0c) >> +#define LIOINTC_REG_INTC_POL (LIOINTC_INTC_CHIP_START + 0x10) >> +#define LIOINTC_REG_INTC_EDGE (LIOINTC_INTC_CHIP_START + 0x14) >> + >> +#define LIOINTC_SHIFT_INTx 4 >> + >> +struct liointc_handler_data { >> + struct liointc_priv *priv; >> + u32 parent_int_map; >> +}; >> + >> +struct liointc_priv { >> + struct irq_chip_generic *gc; >> + struct liointc_handler_data handler[LIOINTC_NUM_PARENT]; >> + u8 map_cache[LIOINTC_CHIP_IRQ]; >> +}; >> + >> +static void liointc_chained_handle_irq(struct irq_desc *desc) >> +{ >> + struct liointc_handler_data *handler = >> irq_desc_get_handler_data(desc); >> + struct irq_chip *chip = irq_desc_get_chip(desc); >> + struct irq_chip_generic *gc = handler->priv->gc; >> + u32 pending; >> + >> + chained_irq_enter(chip, desc); >> + >> + pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS); >> + >> + if (!pending) >> + spurious_interrupt(); >> + >> + while (pending) { >> + int bit = __ffs(pending); >> + >> + generic_handle_irq(irq_find_mapping(gc->domain, bit)); >> + pending &= ~BIT(bit); >> + } > > Consider using the for_each_set_bit() macro from <linux/bitops.h>. > See drivers/irqchip/irq-ingenic-tcu.c for instance. which would require changing the pending type to be unsigned long. Open-coding these if fine if it helps keeping the type system consistent. M.
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 6d397732138d..c609eaa319d2 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -513,4 +513,13 @@ config EXYNOS_IRQ_COMBINER Say yes here to add support for the IRQ combiner devices embedded in Samsung Exynos chips. +config LOONGSON_LIOINTC + bool "Loongson Local I/O Interrupt Controller" + depends on MACH_LOONGSON64 + default y + select IRQ_DOMAIN + select GENERIC_IRQ_CHIP + help + Support for the Loongson Local I/O Interrupt Controller. + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index eae0d78cbf22..5e7678efdfe6 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -105,3 +105,4 @@ obj-$(CONFIG_MADERA_IRQ) += irq-madera.o obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o +obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c new file mode 100644 index 000000000000..18de2c09ece4 --- /dev/null +++ b/drivers/irqchip/irq-loongson-liointc.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com> + * Loongson Local IO Interrupt Controller support + */ + +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/irqchip.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/io.h> +#include <linux/smp.h> +#include <linux/irqchip/chained_irq.h> + +#include <boot_param.h> + +#define LIOINTC_CHIP_IRQ 32 +#define LIOINTC_NUM_PARENT 4 + +#define LIOINTC_INTC_CHIP_START 0x20 + +#define LIOINTC_REG_INTC_STATUS (LIOINTC_INTC_CHIP_START + 0x20) +#define LIOINTC_REG_INTC_EN_STATUS (LIOINTC_INTC_CHIP_START + 0x04) +#define LIOINTC_REG_INTC_ENABLE (LIOINTC_INTC_CHIP_START + 0x08) +#define LIOINTC_REG_INTC_DISABLE (LIOINTC_INTC_CHIP_START + 0x0c) +#define LIOINTC_REG_INTC_POL (LIOINTC_INTC_CHIP_START + 0x10) +#define LIOINTC_REG_INTC_EDGE (LIOINTC_INTC_CHIP_START + 0x14) + +#define LIOINTC_SHIFT_INTx 4 + +struct liointc_handler_data { + struct liointc_priv *priv; + u32 parent_int_map; +}; + +struct liointc_priv { + struct irq_chip_generic *gc; + struct liointc_handler_data handler[LIOINTC_NUM_PARENT]; + u8 map_cache[LIOINTC_CHIP_IRQ]; +}; + +static void liointc_chained_handle_irq(struct irq_desc *desc) +{ + struct liointc_handler_data *handler = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irq_chip_generic *gc = handler->priv->gc; + u32 pending; + + chained_irq_enter(chip, desc); + + pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS); + + if (!pending) + spurious_interrupt(); + + while (pending) { + int bit = __ffs(pending); + + generic_handle_irq(irq_find_mapping(gc->domain, bit)); + pending &= ~BIT(bit); + } + + chained_irq_exit(chip, desc); +} + +static void liointc_set_bit(struct irq_chip_generic *gc, + unsigned int offset, + u32 mask, bool set) +{ + if (set) + writel(readl(gc->reg_base + offset) | mask, + gc->reg_base + offset); + else + writel(readl(gc->reg_base + offset) & ~mask, + gc->reg_base + offset); +} + +static int liointc_set_type(struct irq_data *data, unsigned int type) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + u32 mask = data->mask; + unsigned long flags; + + irq_gc_lock_irqsave(gc, flags); + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false); + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_LEVEL_LOW: + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false); + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false); + break; + case IRQ_TYPE_EDGE_RISING: + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true); + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_EDGE_FALLING: + liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true); + liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false); + break; + default: + return -EINVAL; + } + irq_gc_unlock_irqrestore(gc, flags); + + irqd_set_trigger_type(data, type); + return 0; +} + +static void liointc_resume(struct irq_chip_generic *gc) +{ + struct liointc_priv *priv = gc->private; + unsigned long flags; + int i; + + irq_gc_lock_irqsave(gc, flags); + /* Disable all at first */ + writel(0xffffffff, gc->reg_base + LIOINTC_REG_INTC_DISABLE); + /* Revert map cache */ + for (i = 0; i < LIOINTC_CHIP_IRQ; i++) + writeb(priv->map_cache[i], gc->reg_base + i); + /* Revert mask cache */ + writel(~gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE); + irq_gc_unlock_irqrestore(gc, flags); +} + +static const char * const parent_names[] = {"int0", "int1", "int2", "int3"}; + +int __init liointc_of_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_chip_generic *gc; + struct irq_domain *domain; + struct irq_chip_type *ct; + struct liointc_priv *priv; + void __iomem *base; + u32 of_parent_int_map[LIOINTC_NUM_PARENT]; + int parent_irq[LIOINTC_NUM_PARENT]; + bool have_parent = FALSE; + int sz, i, err = 0; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + base = of_iomap(node, 0); + if (!base) { + err = -ENODEV; + goto out_free_priv; + } + + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { + parent_irq[i] = of_irq_get_byname(node, parent_names[i]); + if (parent_irq[i] > 0) + have_parent = TRUE; + } + if (!have_parent) { + err = -ENODEV; + goto out_iounmap; + } + + sz = of_property_read_variable_u32_array(node, + "loongson,parent_int_map", + &of_parent_int_map[0], + LIOINTC_NUM_PARENT, + LIOINTC_NUM_PARENT); + if (sz < 4) { + pr_err("loongson-liointc: No parent_int_map\n"); + err = -ENODEV; + goto out_iounmap; + } + + for (i = 0; i < LIOINTC_NUM_PARENT; i++) + priv->handler[i].parent_int_map = of_parent_int_map[i]; + + /* Setup IRQ domain */ + domain = irq_domain_add_linear(node, 32, + &irq_generic_chip_ops, priv); + if (!domain) { + pr_err("loongson-liointc: cannot add IRQ domain\n"); + err = -EINVAL; + goto out_iounmap; + } + + err = irq_alloc_domain_generic_chips(domain, 32, 1, + node->full_name, handle_level_irq, + IRQ_NOPROBE, 0, 0); + if (err) { + pr_err("loongson-liointc: unable to register IRQ domain\n"); + goto out_free_domain; + } + + + /* Disable all IRQs */ + writel(0xffffffff, base + LIOINTC_REG_INTC_DISABLE); + /* Set to level triggered */ + writel(0x0, base + LIOINTC_REG_INTC_EDGE); + + /* Generate parent INT part of map cache */ + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { + u32 pending = priv->handler[i].parent_int_map; + + while (pending) { + int bit = __ffs(pending); + + priv->map_cache[bit] = BIT(i) << LIOINTC_SHIFT_INTx; + pending &= ~BIT(bit); + } + } + + for (i = 0; i < LIOINTC_CHIP_IRQ; i++) { + /* Generate core part of map cache */ + priv->map_cache[i] |= BIT(loongson_sysconf.boot_cpu_id); + writeb(priv->map_cache[i], base + i); + } + + gc = irq_get_domain_generic_chip(domain, 0); + gc->private = priv; + gc->reg_base = base; + gc->domain = domain; + gc->resume = liointc_resume; + + ct = gc->chip_types; + ct->regs.enable = LIOINTC_REG_INTC_ENABLE; + ct->regs.disable = LIOINTC_REG_INTC_DISABLE; + ct->chip.irq_unmask = irq_gc_unmask_enable_reg; + ct->chip.irq_mask = irq_gc_mask_disable_reg; + ct->chip.irq_mask_ack = irq_gc_mask_disable_reg; + ct->chip.irq_set_type = liointc_set_type; + + gc->mask_cache = 0xffffffff; + priv->gc = gc; + + for (i = 0; i < LIOINTC_NUM_PARENT; i++) { + if (parent_irq[i] <= 0) + continue; + + priv->handler[i].priv = priv; + irq_set_chained_handler_and_data(parent_irq[i], + liointc_chained_handle_irq, &priv->handler[i]); + } + + return 0; + +out_free_domain: + irq_domain_remove(domain); +out_iounmap: + iounmap(base); +out_free_priv: + kfree(priv); + + return err; +} + +IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init); +IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);