From patchwork Thu Aug 4 04:30:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rich Felker X-Patchwork-Id: 9262673 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A7CFA6048F for ; Thu, 4 Aug 2016 04:39:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D5D927165 for ; Thu, 4 Aug 2016 04:39:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 925A527C05; Thu, 4 Aug 2016 04:39:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2FB3227EED for ; Thu, 4 Aug 2016 04:39:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933329AbcHDEjq (ORCPT ); Thu, 4 Aug 2016 00:39:46 -0400 Received: from 216-12-86-13.cv.mvl.ntelos.net ([216.12.86.13]:59564 "EHLO brightrain.aerifal.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933290AbcHDEjQ (ORCPT ); Thu, 4 Aug 2016 00:39:16 -0400 Received: from dalias by brightrain.aerifal.cx with local (Exim 3.15 #2) id 1bVAIn-0003Je-00; Thu, 04 Aug 2016 04:30:37 +0000 Message-Id: In-Reply-To: References: From: Rich Felker Subject: [PATCH v6 2/2] irqchip: add J-Core AIC driver To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-sh@vger.kernel.org Cc: Thomas Gleixner , Jason Cooper , Marc Zyngier , Rob Herring , Mark Rutland Date: Thu, 04 Aug 2016 04:30:37 +0000 Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There are two versions of the J-Core interrupt controller in use, aic1 which generates interrupts with programmable priorities, but only supports 8 irq lines and maps them to cpu traps in the range 17 to 24, and aic2 which uses traps in the range 64-127 and supports up to 128 irqs, with priorities dependent on the interrupt number. The Linux driver does not make use of priorities anyway. For simplicity, there is no aic1-specific logic in the driver beyond setting the priority register, which is necessary for interrupts to work at all. Eventually aic1 will likely be phased out, but it's currently in use in deployments and all released bitstream binaries. Signed-off-by: Rich Felker --- drivers/irqchip/Kconfig | 7 +++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-jcore-aic.c | 94 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 102 insertions(+) create mode 100644 drivers/irqchip/irq-jcore-aic.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 5495a5b..ab84ce3 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -156,6 +156,13 @@ config PIC32_EVIC select GENERIC_IRQ_CHIP select IRQ_DOMAIN +config JCORE_AIC + bool "J-Core integrated AIC" + depends on OF && (SUPERH || COMPILE_TEST) + select IRQ_DOMAIN + help + Support for the J-Core integrated AIC. + config RENESAS_INTC_IRQPIN bool select IRQ_DOMAIN diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 4c203b6..ee7e3ca 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_I8259) += irq-i8259.o obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o obj-$(CONFIG_IRQ_MIPS_CPU) += irq-mips-cpu.o obj-$(CONFIG_SIRF_IRQ) += irq-sirfsoc.o +obj-$(CONFIG_JCORE_AIC) += irq-jcore-aic.o obj-$(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 diff --git a/drivers/irqchip/irq-jcore-aic.c b/drivers/irqchip/irq-jcore-aic.c new file mode 100644 index 0000000..5e5e3bb --- /dev/null +++ b/drivers/irqchip/irq-jcore-aic.c @@ -0,0 +1,94 @@ +/* + * J-Core SoC AIC driver + * + * Copyright (C) 2015-2016 Smart Energy Instruments, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define JCORE_AIC_MAX_HWIRQ 127 +#define JCORE_AIC1_MIN_HWIRQ 16 +#define JCORE_AIC2_MIN_HWIRQ 64 + +#define JCORE_AIC1_INTPRI_REG 8 + +static struct irq_chip jcore_aic; + +static int jcore_aic_irqdomain_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct irq_chip *aic = d->host_data; + + irq_set_chip_and_handler(irq, aic, handle_simple_irq); + + return 0; +} + +static const struct irq_domain_ops jcore_aic_irqdomain_ops = { + .map = jcore_aic_irqdomain_map, + .xlate = irq_domain_xlate_onecell, +}; + +static void noop(struct irq_data *data) +{ +} + +int __init aic_irq_of_init(struct device_node *node, struct device_node *parent) +{ + unsigned min_irq = JCORE_AIC2_MIN_HWIRQ; + unsigned dom_sz = JCORE_AIC_MAX_HWIRQ+1; + struct irq_domain *domain; + + pr_info("Initializing J-Core AIC\n"); + + /* AIC1 needs priority initialization to receive interrupts. */ + if (of_device_is_compatible(node, "jcore,aic1")) { + unsigned cpu; + + for_each_present_cpu(cpu) { + void __iomem *base = of_iomap(node, cpu); + + if (!base) { + pr_err("Unable to map AIC for cpu %u\n", cpu); + return -ENOMEM; + } + __raw_writel(0xffffffff, base + JCORE_AIC1_INTPRI_REG); + iounmap(base); + } + min_irq = JCORE_AIC1_MIN_HWIRQ; + } + + /* + * The irq chip framework requires either mask/unmask or enable/disable + * function pointers to be provided, but the hardware does not have any + * such mechanism; the only interrupt masking is at the cpu level and + * it affects all interrupts. We provide dummy mask/unmask. The hardware + * handles all interrupt control and clears pending status when the cpu + * accepts the interrupt. + */ + jcore_aic.irq_mask = noop; + jcore_aic.irq_unmask = noop; + jcore_aic.name = "AIC"; + + domain = irq_domain_add_linear(node, dom_sz, &jcore_aic_irqdomain_ops, + &jcore_aic); + if (!domain) + return -ENOMEM; + irq_create_strict_mappings(domain, min_irq, min_irq, dom_sz - min_irq); + + return 0; +} + +IRQCHIP_DECLARE(jcore_aic2, "jcore,aic2", aic_irq_of_init); +IRQCHIP_DECLARE(jcore_aic1, "jcore,aic1", aic_irq_of_init);