On Tue, 8 Oct 2013 05:24:26 -0700 Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> wrote: > This adds an irqchip driver and corresponding devicetree binding for the > secondary interrupt controllers based on Synopsys DesignWare IP dw_apb_ictl. > > Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> > --- > Changelog: > RFCv1->RFCv2: > - added copyright reference > > Cc: Jason Cooper <jason@xxxxxxxxxxxxxx> > Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> > Cc: Arnd Bergmann <arnd@xxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: devicetree@xxxxxxxxxxxxxxx > Cc: linux-doc@xxxxxxxxxxxxxxx > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > --- > .../interrupt-controller/snps,dw-apb-ictl.txt | 29 ++++ > drivers/irqchip/Kconfig | 4 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-dw-apb-ictl.c | 142 > ++++++++++++++++++++ 4 files changed, 176 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt > create mode 100644 drivers/irqchip/irq-dw-apb-ictl.c > > diff --git > a/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt > b/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt > new file mode 100644 index 0000000..7ccd1ba --- /dev/null > +++ > b/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt > @@ -0,0 +1,29 @@ +Synopsys DesignWare APB interrupt controller (dw_apb_ictl) > + > +Synopsys DesignWare provides interrupt controller IP for APB known as > +dw_apb_ictl. The IP is used as secondary interrupt controller in some SoCs > with +APB bus, e.g. Marvell Armada 1500. > + > +Required properties: > +- compatible: shall be "snps,dw-apb-ictl" > +- reg: base address of interrupt registers starting with ENABLE_LOW > register +- interrupt-controller: identifies the node as an interrupt > controller +- #interrupt-cells: number of cells to encode an interrupt > source, shall be 1 +- interrupts: interrupt reference to primary interrupt > controller +- interrupt-parent: (optional) reference specific primary > interrupt controller + > +The interrupt sources map to the corresponding bits in the interrupt > +registers, i.e. > +- 0 maps to bit 0 of low interrupts, > +- 1 maps to bit 1 of low interrupts, > +- 32 maps to bit 0 of high interrupts, and so on. > + > +Example: > + aic: interrupt-controller@3000 { > + compatible = "snps,dw-apb-ictl"; > + reg = <0x3000 0xc00>; > + interrupt-controller; > + #interrupt-cells = <1>; > + interrupt-parent = <&gic>; > + interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>; > + }; > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig > index 3792a1a..940638d 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -30,6 +30,10 @@ config ARM_VIC_NR > The maximum number of VICs available in the system, for > power management. > > +config DW_APB_ICTL > + bool > + select IRQ_DOMAIN > + > config IMGPDC_IRQ > bool > select GENERIC_IRQ_CHIP > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index c60b901..6427323 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -6,6 +6,7 @@ obj-$(CONFIG_ARCH_MMP) += irq-mmp.o > obj-$(CONFIG_ARCH_MVEBU) += irq-armada-370-xp.o > obj-$(CONFIG_ARCH_MXS) += irq-mxs.o > obj-$(CONFIG_ARCH_S3C24XX) += irq-s3c24xx.o > +obj-$(CONFIG_DW_APB_ICTL) += irq-dw-apb-ictl.o > obj-$(CONFIG_METAG) += irq-metag-ext.o > obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) += irq-metag.o > obj-$(CONFIG_ARCH_MOXART) += irq-moxart.o > diff --git a/drivers/irqchip/irq-dw-apb-ictl.c > b/drivers/irqchip/irq-dw-apb-ictl.c new file mode 100644 > index 0000000..bbcacee > --- /dev/null > +++ b/drivers/irqchip/irq-dw-apb-ictl.c > @@ -0,0 +1,142 @@ > +/* > + * Synopsys DW APB ICTL irqchip driver. > + * > + * Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> > + * > + * based on GPL'ed 2.6 kernel sources > + * (c) Marvell International Ltd. > + * > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/io.h> > +#include <linux/irq.h> > +#include <linux/irqchip/chained_irq.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > + > +#include "irqchip.h" > + > +#define APB_INT_ENABLE_L 0x00 > +#define APB_INT_ENABLE_H 0x04 > +#define APB_INT_MASK_L 0x08 > +#define APB_INT_MASK_H 0x0c > +#define APB_INT_FINALSTATUS_L 0x30 > +#define APB_INT_FINALSTATUS_H 0x34 > + > +static void dw_apb_ictl_handler(unsigned int irq, struct irq_desc *desc) > +{ > + struct irq_chip *chip = irq_get_chip(irq); > + struct irq_chip_generic *gc = irq_get_handler_data(irq); > + struct irq_domain *d = gc->private; > + u32 stat; > + int n; > + > + chained_irq_enter(chip, desc); > + > + for (n = 0; n < gc->num_ct; n++) { > + stat = readl_relaxed(gc->reg_base + > + APB_INT_FINALSTATUS_L + 4 * n); > + while (stat) { > + u32 hwirq = ffs(stat) - 1; > + generic_handle_irq(irq_find_mapping(d, > + gc->irq_base + hwirq + 32 * n)); > + stat &= ~(1 << hwirq); > + } > + } > + > + chained_irq_exit(chip, desc); > +} > + > +static int __init dw_apb_ictl_init(struct device_node *np, > + struct device_node *parent) > +{ > + unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; > + struct resource r; > + struct irq_domain *domain; > + struct irq_chip_generic *gc; > + void __iomem *iobase; > + int ret, nrirqs, irq; > + u32 reg; > + > + /* Map the parent interrupt for the chained handler */ > + irq = irq_of_parse_and_map(np, 0); > + if (irq <= 0) { > + pr_err("%s: unable to parse irq\n", np->name); > + return -EINVAL; > + } > + > + ret = of_address_to_resource(np, 0, &r); > + if (ret) { > + pr_err("%s: unable to get resource\n", np->name); > + return ret; > + } > + > + if (!request_mem_region(r.start, resource_size(&r), np->name)) { > + pr_err("%s: unable to request mem region\n", np->name); > + return -ENOMEM; > + } > + > + iobase = ioremap(r.start, resource_size(&r)); > + if (!iobase) { > + pr_err("%s: unable to map resource\n", np->name); release_mem_region() is missing > + return -ENOMEM; > + } > + > + /* > + * DW IP can be configured to allow 2-64 irqs. We can determine > + * the number of irqs supported by writing into enable register > + * and look for bits not set, as corresponding flip-flops will > + * have been removed by sythesis tool. > + */ > + > + /* mask and enable all interrupts */ > + writel(~0, iobase + APB_INT_MASK_L); > + writel(~0, iobase + APB_INT_MASK_H); > + writel(~0, iobase + APB_INT_ENABLE_L); > + writel(~0, iobase + APB_INT_ENABLE_H); > + > + reg = readl(iobase + APB_INT_ENABLE_H); > + if (reg) > + nrirqs = 32 + fls(reg); > + else > + nrirqs = fls(readl(iobase + APB_INT_ENABLE_L)); > + > + domain = irq_domain_add_linear(np, nrirqs, > + &irq_generic_chip_ops, NULL); > + if (!domain) { > + pr_err("%s: unable to add irq domain\n", np->name); iounmap() and release_mem_region() is missing > + return -ENOMEM; > + } > + > + ret = irq_alloc_domain_generic_chips(domain, 32, (nrirqs > 32) ? > 2 : 1, > + np->name, handle_level_irq, > clr, 0, > + IRQ_GC_INIT_MASK_CACHE); > + if (ret) { > + pr_err("%s: unable to alloc irq domain gc\n", np->name); > + return ret; > + } > + > + gc = irq_get_domain_generic_chip(domain, 0); > + gc->private = domain; > + gc->reg_base = iobase; > + > + gc->chip_types[0].regs.mask = APB_INT_MASK_L; > + gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit; > + gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit; > + > + if (nrirqs > 32) { > + gc->chip_types[1].regs.mask = APB_INT_MASK_H; > + gc->chip_types[1].chip.irq_mask = irq_gc_mask_set_bit; > + gc->chip_types[1].chip.irq_unmask = irq_gc_mask_clr_bit; > + } > + > + irq_set_handler_data(irq, gc); > + irq_set_chained_handler(irq, dw_apb_ictl_handler); > + > + return 0; > +} > +IRQCHIP_DECLARE(dw_apb_ictl, > + "snps,dw-apb-ictl", dw_apb_ictl_init); > -- > 1.7.10.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html