Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752723Ab3F0N36 (ORCPT ); Thu, 27 Jun 2013 09:29:58 -0400 Received: from mail-lb0-f176.google.com ([209.85.217.176]:39988 "EHLO mail-lb0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751746Ab3F0N35 (ORCPT ); Thu, 27 Jun 2013 09:29:57 -0400 From: Jonas Jensen To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, arm@kernel.org, tglx@linutronix.de, grant.likely@secretlab.ca, thomas.petazzoni@free-electrons.com, arnd@arndb.de, Jonas Jensen Subject: [PATCH v3] ARM: irqchip: add support for MOXA ART SoCs Date: Thu, 27 Jun 2013 15:29:33 +0200 Message-Id: <1372339773-4974-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1371718732-12680-1-git-send-email-jonas.jensen@gmail.com> References: <1371718732-12680-1-git-send-email-jonas.jensen@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4665 Lines: 154 This patch adds an irqchip driver for the main interrupt controller found on MOXA ART SoCs. Signed-off-by: Jonas Jensen --- Notes: Applies to next-20130619 Changes since v2: 1. bail if irq_alloc_domain_generic_chips fails 2. remove separate function "moxart_alloc_gc", move all code to main init 3. if of_iomap fails, instead of panic, print error and return -EINVAL 4. use of_property_read_u32 instead of be32_to_cpup(of_get_property(..)) drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-moxart.c | 110 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 111 insertions(+) create mode 100644 drivers/irqchip/irq-moxart.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index cda4cb5..956d129 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -16,3 +16,4 @@ obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o obj-$(CONFIG_ARCH_VT8500) += irq-vt8500.o +obj-$(CONFIG_ARCH_MOXART) += irq-moxart.o diff --git a/drivers/irqchip/irq-moxart.c b/drivers/irqchip/irq-moxart.c new file mode 100644 index 0000000..0815108 --- /dev/null +++ b/drivers/irqchip/irq-moxart.c @@ -0,0 +1,110 @@ +/* + * MOXA ART SoCs IRQ chip driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * 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 +#include +#include +#include +#include +#include + +#include + +#include "irqchip.h" + +#define IRQ_SOURCE_REG 0 +#define IRQ_MASK_REG 0x04 +#define IRQ_CLEAR_REG 0x08 +#define IRQ_MODE_REG 0x0c +#define IRQ_LEVEL_REG 0x10 +#define IRQ_STATUS_REG 0x14 + +#define FIQ_SOURCE_REG 0x20 +#define FIQ_MASK_REG 0x24 +#define FIQ_CLEAR_REG 0x28 +#define FIQ_MODE_REG 0x2c +#define FIQ_LEVEL_REG 0x30 +#define FIQ_STATUS_REG 0x34 + +static void __iomem *moxart_irq_base; +static struct irq_domain *moxart_irq_domain; +static unsigned int interrupt_mask; + +asmlinkage void __exception_irq_entry moxart_handle_irq(struct pt_regs *regs) +{ + u32 irqstat; + int hwirq; + + irqstat = readl(moxart_irq_base + IRQ_STATUS_REG); + + while (irqstat) { + hwirq = ffs(irqstat) - 1; + handle_IRQ(irq_find_mapping(moxart_irq_domain, hwirq), regs); + irqstat &= ~(1 << hwirq); + } +} + +static int __init moxart_of_intc_init(struct device_node *node, + struct device_node *parent) +{ + unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; + int ret; + struct irq_chip_generic *gc; + + ret = of_property_read_u32(node, "interrupt-mask", &interrupt_mask); + if (ret) + pr_err("%s: can't read interrupt-mask DT property\n", + node->full_name); + pr_debug("%s: interrupt-mask=%x\n", node->full_name, interrupt_mask); + + moxart_irq_base = of_iomap(node, 0); + if (!moxart_irq_base) { + pr_err("%s: unable to map INTC CPU registers\n", + node->full_name); + return -EINVAL; + } + + moxart_irq_domain = irq_domain_add_linear(node, 32, + &irq_generic_chip_ops, moxart_irq_base); + + ret = irq_alloc_domain_generic_chips(moxart_irq_domain, 32, 1, + "MOXARTINTC", handle_edge_irq, + clr, 0, IRQ_GC_INIT_MASK_CACHE); + + if (ret) { + pr_err("%s: could not allocate generic chip\n", __func__); + return -EINVAL; + } + + gc = irq_get_domain_generic_chip(moxart_irq_domain, 0); + + gc->reg_base = moxart_irq_base; + gc->chip_types[0].regs.mask = IRQ_MASK_REG; + gc->chip_types[0].regs.ack = IRQ_CLEAR_REG; + gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; + gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; + gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; + + writel(0, moxart_irq_base + IRQ_MASK_REG); + writel(0xffffffff, moxart_irq_base + IRQ_CLEAR_REG); + + writel(interrupt_mask, moxart_irq_base + IRQ_MODE_REG); + writel(interrupt_mask, moxart_irq_base + IRQ_LEVEL_REG); + + set_handle_irq(moxart_handle_irq); + + pr_info("%s: %s finished\n", node->full_name, __func__); + + return 0; +} +IRQCHIP_DECLARE(moxa_moxart_ic, "moxa,moxart-interrupt-controller", + moxart_of_intc_init); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/