Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161380AbbBDP3x (ORCPT ); Wed, 4 Feb 2015 10:29:53 -0500 Received: from mailapp01.imgtec.com ([195.59.15.196]:41797 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161075AbbBDPWo (ORCPT ); Wed, 4 Feb 2015 10:22:44 -0500 From: Zubair Lutfullah Kakakhel To: CC: , , , , , , , , , , , , Subject: [PATCH_V2 22/34] MIPS: jz4740: support >32 interrupts Date: Wed, 4 Feb 2015 15:21:51 +0000 Message-ID: <1423063323-19419-23-git-send-email-Zubair.Kakakhel@imgtec.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1423063323-19419-1-git-send-email-Zubair.Kakakhel@imgtec.com> References: <1423063323-19419-1-git-send-email-Zubair.Kakakhel@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.154.89] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4483 Lines: 132 From: Paul Burton On later jz47xx series SoCs the interrupt controller supports more than 32 interrupts, which it does by duplicating the registers at intervals of 0x20 bytes within its address space. Add support for an arbitrary number of interrupts using multiple generic chips, and provide the number of chips to register from the SoC-specific probe function. Signed-off-by: Paul Burton Cc: Lars-Peter Clausen --- arch/mips/jz4740/irq.c | 58 ++++++++++++++++++++++++++++++++------------------ 1 file changed, 37 insertions(+), 21 deletions(-) diff --git a/arch/mips/jz4740/irq.c b/arch/mips/jz4740/irq.c index a620b23..3e53a32 100644 --- a/arch/mips/jz4740/irq.c +++ b/arch/mips/jz4740/irq.c @@ -33,21 +33,27 @@ #include "../../drivers/irqchip/irqchip.h" static void __iomem *jz_intc_base; +static unsigned jz_num_chips; #define JZ_REG_INTC_STATUS 0x00 #define JZ_REG_INTC_MASK 0x04 #define JZ_REG_INTC_SET_MASK 0x08 #define JZ_REG_INTC_CLEAR_MASK 0x0c #define JZ_REG_INTC_PENDING 0x10 +#define CHIP_SIZE 0x20 static irqreturn_t jz4740_cascade(int irq, void *data) { uint32_t irq_reg; + unsigned i; - irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING); + for (i = 0; i < jz_num_chips; i++) { + irq_reg = readl(jz_intc_base + (i * CHIP_SIZE) + JZ_REG_INTC_PENDING); + if (!irq_reg) + continue; - if (irq_reg) - generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE); + generic_handle_irq(__fls(irq_reg) + (i * 32) + JZ4740_IRQ_BASE); + } return IRQ_HANDLED; } @@ -77,39 +83,43 @@ static struct irqaction jz4740_cascade_action = { .name = "JZ4740 cascade interrupt", }; -static int __init jz4740_intc_of_init(struct device_node *node, - struct device_node *parent) +static int __init jz47xx_intc_of_init(struct device_node *node, unsigned num_chips) { struct irq_chip_generic *gc; struct irq_chip_type *ct; struct irq_domain *domain; int parent_irq; + unsigned i; parent_irq = irq_of_parse_and_map(node, 0); if (!parent_irq) return -EINVAL; - jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14); + jz_num_chips = num_chips; + jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, + ((num_chips - 1) * CHIP_SIZE) + 0x14); - /* Mask all irqs */ - writel(0xffffffff, jz_intc_base + JZ_REG_INTC_SET_MASK); + for (i = 0; i < num_chips; i++) { + /* Mask all irqs */ + writel(0xffffffff, jz_intc_base + (i * CHIP_SIZE) + JZ_REG_INTC_SET_MASK); - gc = irq_alloc_generic_chip("INTC", 1, JZ4740_IRQ_BASE, jz_intc_base, - handle_level_irq); + gc = irq_alloc_generic_chip("INTC", 1, JZ4740_IRQ_BASE + (i * 32), + jz_intc_base + (i * CHIP_SIZE), handle_level_irq); - gc->wake_enabled = IRQ_MSK(32); + gc->wake_enabled = IRQ_MSK(32); - ct = gc->chip_types; - ct->regs.enable = JZ_REG_INTC_CLEAR_MASK; - ct->regs.disable = JZ_REG_INTC_SET_MASK; - 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_wake = irq_gc_set_wake; - ct->chip.irq_suspend = jz4740_irq_suspend; - ct->chip.irq_resume = jz4740_irq_resume; + ct = gc->chip_types; + ct->regs.enable = JZ_REG_INTC_CLEAR_MASK; + ct->regs.disable = JZ_REG_INTC_SET_MASK; + 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_wake = irq_gc_set_wake; + ct->chip.irq_suspend = jz4740_irq_suspend; + ct->chip.irq_resume = jz4740_irq_resume; - irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, IRQ_NOPROBE | IRQ_LEVEL); + irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, IRQ_NOPROBE | IRQ_LEVEL); + } domain = irq_domain_add_legacy(node, num_chips * 32, JZ4740_IRQ_BASE, 0, &irq_domain_simple_ops, NULL); @@ -119,6 +129,12 @@ static int __init jz4740_intc_of_init(struct device_node *node, setup_irq(parent_irq, &jz4740_cascade_action); return 0; } + +static int __init jz4740_intc_of_init(struct device_node *node, + struct device_node *parent) +{ + return jz47xx_intc_of_init(node, 1); +} IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", jz4740_intc_of_init); #ifdef CONFIG_DEBUG_FS -- 1.9.1 -- 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/