From patchwork Wed Apr 21 16:20:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Bogendoerfer X-Patchwork-Id: 1468759 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4FQQlD2Xqsz9sWY for ; Thu, 22 Apr 2021 02:20:40 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244289AbhDUQVL (ORCPT ); Wed, 21 Apr 2021 12:21:11 -0400 Received: from mx2.suse.de ([195.135.220.15]:33654 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244322AbhDUQVC (ORCPT ); Wed, 21 Apr 2021 12:21:02 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C439EB2E5; Wed, 21 Apr 2021 16:20:27 +0000 (UTC) From: Thomas Bogendoerfer To: Linus Walleij , Bartosz Golaszewski , linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v2 1/2] gpio: Add support for IDT 79RC3243x GPIO controller Date: Wed, 21 Apr 2021 18:20:25 +0200 Message-Id: <20210421162026.41978-1-tsbogend@alpha.franken.de> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org IDT 79RC3243x SoCs integrated a gpio controller, which handles up to 32 gpios. All gpios could be used as interrupt source. Signed-off-by: Thomas Bogendoerfer --- Changes in v2: - made driver buildable as module - use for_each_set_bit() in irq dispatch handler - use gpiochip_get_data instead of own container_of helper - use module_platform_driver() instead of arch_initcall - don't default y for Mikrotik RB532 drivers/gpio/Kconfig | 12 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-idt3243x.c | 198 +++++++++++++++++++++++++++++++++++ 3 files changed, 211 insertions(+) create mode 100644 drivers/gpio/gpio-idt3243x.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e3607ec4c2e8..2948eb4ab8a5 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -770,6 +770,18 @@ config GPIO_MSC313 Say Y here to support the main GPIO block on MStar/SigmaStar ARMv7 based SoCs. +config GPIO_IDT3243X + tristate "IDT 79RC3243X GPIO support" + depends on MIKROTIK_RB532 || COMPILE_TEST + select GPIO_GENERIC + select GPIOLIB_IRQCHIP + help + Select this option to enable GPIO driver for + IDT 79RC3243X SoC devices. + + To compile this driver as a module, choose M here: the module will + be called gpio-idt3243x. + endmenu menu "Port-mapped I/O GPIO drivers" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c58a90a3c3b1..75dd9c5665c5 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o +obj-$(CONFIG_GPIO_IDT3243X) += gpio-idt3243x.o obj-$(CONFIG_GPIO_IOP) += gpio-iop.o obj-$(CONFIG_GPIO_IT87) += gpio-it87.o obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o diff --git a/drivers/gpio/gpio-idt3243x.c b/drivers/gpio/gpio-idt3243x.c new file mode 100644 index 000000000000..50e132cb3d47 --- /dev/null +++ b/drivers/gpio/gpio-idt3243x.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for IDT/Renesas 79RC3243x Interrupt Controller. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#define IDT_PIC_IRQ_PEND 0x00 +#define IDT_PIC_IRQ_MASK 0x08 + +#define IDT_GPIO_DIR 0x04 +#define IDT_GPIO_DATA 0x08 +#define IDT_GPIO_ILEVEL 0x0C +#define IDT_GPIO_ISTAT 0x10 + +struct idt_gpio_ctrl { + struct gpio_chip gc; + void __iomem *pic; + void __iomem *gpio; + u32 mask_cache; +}; + +static void idt_gpio_dispatch(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc); + struct irq_chip *host_chip = irq_desc_get_chip(desc); + unsigned int bit, virq; + unsigned long pending; + + chained_irq_enter(host_chip, desc); + + pending = readl(ctrl->pic + IDT_PIC_IRQ_PEND); + pending &= ~ctrl->mask_cache; + for_each_set_bit(bit, &pending, gc->ngpio) { + virq = irq_linear_revmap(gc->irq.domain, bit); + if (virq) + generic_handle_irq(virq); + } + + chained_irq_exit(host_chip, desc); +} + +static int idt_gpio_irq_set_type(struct irq_data *d, unsigned int flow_type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc); + unsigned int sense = flow_type & IRQ_TYPE_SENSE_MASK; + u32 ilevel; + + if (sense & ~(IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) + return -EINVAL; + + ilevel = readl(ctrl->gpio + IDT_GPIO_ILEVEL); + if (sense & IRQ_TYPE_LEVEL_HIGH) + ilevel |= BIT(d->hwirq); + else if (sense & IRQ_TYPE_LEVEL_LOW) + ilevel &= ~BIT(d->hwirq); + else + return -EINVAL; + + writel(ilevel, ctrl->gpio + IDT_GPIO_ILEVEL); + return 0; +} + +static void idt_gpio_ack(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc); + + writel(~BIT(d->hwirq), ctrl->gpio + IDT_GPIO_ISTAT); +} + +static void idt_gpio_mask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc); + + ctrl->mask_cache |= BIT(d->hwirq); + writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK); +} + +static void idt_gpio_unmask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc); + + ctrl->mask_cache &= ~BIT(d->hwirq); + writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK); +} + +static struct irq_chip idt_gpio_irqchip = { + .name = "IDTGPIO", + .irq_mask = idt_gpio_mask, + .irq_ack = idt_gpio_ack, + .irq_unmask = idt_gpio_unmask, + .irq_set_type = idt_gpio_irq_set_type +}; + +static int idt_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct gpio_irq_chip *girq; + struct idt_gpio_ctrl *ctrl; + unsigned int parent_irq; + int ngpios; + int ret; + + ret = device_property_read_u32(dev, "ngpios", &ngpios); + if (ret) { + dev_err(dev, "ngpios property is not valid\n"); + return ret; + } + + ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + + ctrl->gpio = devm_platform_ioremap_resource_byname(pdev, "gpio"); + if (!ctrl->gpio) + return -ENOMEM; + + ctrl->gc.parent = dev; + + ret = bgpio_init(&ctrl->gc, &pdev->dev, 4, ctrl->gpio + IDT_GPIO_DATA, + NULL, NULL, ctrl->gpio + IDT_GPIO_DIR, NULL, 0); + if (ret) { + dev_err(dev, "bgpio_init failed\n"); + return ret; + } + ctrl->gc.ngpio = ngpios; + + ctrl->pic = devm_platform_ioremap_resource_byname(pdev, "pic"); + if (!ctrl->pic) + return -ENOMEM; + + parent_irq = irq_of_parse_and_map(pdev->dev.of_node, 0); + if (!parent_irq) { + dev_err(&pdev->dev, "Failed to map parent IRQ!\n"); + return -EINVAL; + } + + /* Mask interrupts. */ + ctrl->mask_cache = 0xffffffff; + writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK); + + girq = &ctrl->gc.irq; + girq->chip = &idt_gpio_irqchip; + girq->parent_handler = idt_gpio_dispatch; + girq->num_parents = 1; + girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents), + GFP_KERNEL); + if (!girq->parents) { + ret = -ENOMEM; + goto out_unmap_irq; + } + girq->parents[0] = parent_irq; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_level_irq; + + ret = devm_gpiochip_add_data(&pdev->dev, &ctrl->gc, ctrl); + if (ret) + goto out_unmap_irq; + + return 0; + +out_unmap_irq: + irq_dispose_mapping(parent_irq); + return ret; +} + +static const struct of_device_id idt_gpio_of_match[] = { + { .compatible = "idt,3243x-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(of, idt_gpio_of_match); + +static struct platform_driver idt_gpio_driver = { + .probe = idt_gpio_probe, + .driver = { + .name = "idt3243x-gpio", + .of_match_table = idt_gpio_of_match, + }, +}; +module_platform_driver(idt_gpio_driver); + +MODULE_DESCRIPTION("IDT 79RC3243x GPIO/PIC Driver"); +MODULE_AUTHOR("Thomas Bogendoerfer "); +MODULE_LICENSE("GPL");