From patchwork Wed Sep 27 02:45:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 818905 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=nifty.com header.i=@nifty.com header.b="OMKhOMyx"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3y22KG4DPVz9sPr for ; Wed, 27 Sep 2017 12:46:58 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968349AbdI0Cqo (ORCPT ); Tue, 26 Sep 2017 22:46:44 -0400 Received: from conuserg-07.nifty.com ([210.131.2.74]:56376 "EHLO conuserg-07.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934771AbdI0Cqn (ORCPT ); Tue, 26 Sep 2017 22:46:43 -0400 Received: from pug.e01.socionext.com (p14092-ipngnfx01kyoto.kyoto.ocn.ne.jp [153.142.97.92]) (authenticated) by conuserg-07.nifty.com with ESMTP id v8R2jiYN009483; Wed, 27 Sep 2017 11:45:46 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-07.nifty.com v8R2jiYN009483 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1506480346; bh=P4nFzQKMWibQFU0QwvqMPvI6Eei29vRx/+/3NWAsb+8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OMKhOMyx+qu56E/CzE71+76xOwkzI6+QiVgNnZ/wCFQQhiPlzbLpc+ei0kpSe64/n m37oIVSeEo6Cb9va2Mgcyf2lHzOGbcW21AjTmmwabzixCZG1/nX+YjJLt7BRUzeM8n sS/LCtSKGq9LU5whH+9U6VFRfY1Z0As8QPOLl6C5I8g91cxd/pxQhYnMgUbKr6YIdp qbkLhZOG/702uscgDknoWZsPpa9X3wc2tcgvIaY34yRXuVYCpv9tJLKpIzrP4sYrpe LxjHLMi8FntsSobbxM3W5p2l5zeUyGDNwvMigk3HYOnrVHN96Q1MDUGaPlWp1YQ7a1 5tp6o1oz7LQ7g== X-Nifty-SrcIP: [153.142.97.92] From: Masahiro Yamada To: linux-gpio@vger.kernel.org Cc: devicetree@vger.kernel.org, Rob Herring , Masami Hiramatsu , Jassi Brar , Masahiro Yamada , Linus Walleij , linux-kernel@vger.kernel.org, Rob Herring , Mark Rutland , linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 1/2] dt-bindings: gpio: uniphier: add UniPhier GPIO binding Date: Wed, 27 Sep 2017 11:45:42 +0900 Message-Id: <1506480343-9597-2-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506480343-9597-1-git-send-email-yamada.masahiro@socionext.com> References: <1506480343-9597-1-git-send-email-yamada.masahiro@socionext.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This GPIO controller is used on UniPhier SoC family. The vendor specific property "socionext,interrupt-ranges" is for specifying interrupt mapping to the parent interrupt controller because the mapping is not contiguous. It works like "ranges", but transforms "interrupts" instead of "reg". Signed-off-by: Masahiro Yamada Acked-by: Rob Herring --- .../devicetree/bindings/gpio/gpio-uniphier.txt | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-uniphier.txt diff --git a/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt new file mode 100644 index 0000000..6d9251a --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt @@ -0,0 +1,40 @@ +UniPhier GPIO controller + +Required properties: +- compatible: Should be "socionext,uniphier-gpio". +- reg: Specifies offset and length of the register set for the device. +- gpio-controller: Marks the device node as a GPIO controller. +- #gpio-cells: Should be 2. The first cell is the pin number and the second + cell is used to specify optional parameters. +- interrupt-parent: Specifies the parent interrupt controller. +- interrupt-controller: Marks the device node as an interrupt controller. +- #interrupt-cells: Should be 2. The first cell defines the interrupt number. + The second cell bits[3:0] is used to specify trigger type as follows: + 1 = low-to-high edge triggered + 2 = high-to-low edge triggered + 4 = active high level-sensitive + 8 = active low level-sensitive + Valid combinations are 1, 2, 3, 4, 8. +- ngpios: Specifies the number of GPIO lines. +- gpio-ranges: Mapping to pin controller pins (as described in gpio.txt) +- socionext,interrupt-ranges: Specifies an interrupt number mapping between + this GPIO controller and its interrupt parent, in the form of arbitrary + number of triplets. + +Optional properties: +- gpio-ranges-group-names: Used for named gpio ranges (as described in gpio.txt) + +Example: + gpio: gpio@55000000 { + compatible = "socionext,uniphier-gpio"; + reg = <0x55000000 0x200>; + interrupt-parent = <&aidet>; + interrupt-controller; + #interrupt-cells = <2>; + gpio-controller; + #gpio-cells = <2>; + gpio-ranges = <&pinctrl 0 0 0>; + gpio-ranges-group-names = "gpio_range"; + ngpios = <248>; + socionext,interrupt-ranges = <0 48 16>, <16 154 5>, <21 217 3>; + }; From patchwork Wed Sep 27 02:45:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 818908 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=nifty.com header.i=@nifty.com header.b="e+7KIcEM"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3y22Lb6CTYz9sPr for ; Wed, 27 Sep 2017 12:48:07 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S969773AbdI0Crp (ORCPT ); Tue, 26 Sep 2017 22:47:45 -0400 Received: from conuserg-07.nifty.com ([210.131.2.74]:58216 "EHLO conuserg-07.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936342AbdI0Crm (ORCPT ); Tue, 26 Sep 2017 22:47:42 -0400 Received: from pug.e01.socionext.com (p14092-ipngnfx01kyoto.kyoto.ocn.ne.jp [153.142.97.92]) (authenticated) by conuserg-07.nifty.com with ESMTP id v8R2jiYO009483; Wed, 27 Sep 2017 11:45:46 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-07.nifty.com v8R2jiYO009483 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1506480347; bh=wqgzzXijZ1wNi1WEVxVg07hLOV4GgkfimxkTPmGSzGQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e+7KIcEMWAheqnZWvFmlBbE5GCanLiUT9xW8Qt9njqCSlaKlaIFnDxIhrIzFha0Ho 7G0mVazJH6+YHbMpGq15H9LIUjNscIZAtSozXunCGqQe3oJ21Up0v210NDM+8uqVqP xZTj+QGvcQvZ+hA2aAYtM4yBckSBj1HvTeUsKxUQngrrsAhAzTDHEQAJnTmy71JhN/ 3eYSxbHn6TEUK5GKB09sxqSaQERalpPNQA9Y5rFwyWwH/PAE4StTMo3vIr3qqQGQZj 5fEpr8v9d+JBQdlq9T3SskAnjpxrQ11JFyfvq7u1NjKM8ll1LKSt33CpmoxKqB5e5N CSvAur5STV2kQ== X-Nifty-SrcIP: [153.142.97.92] From: Masahiro Yamada To: linux-gpio@vger.kernel.org Cc: devicetree@vger.kernel.org, Rob Herring , Masami Hiramatsu , Jassi Brar , Masahiro Yamada , Mauro Carvalho Chehab , Randy Dunlap , Linus Walleij , linux-kernel@vger.kernel.org, "David S. Miller" , Rob Herring , Greg Kroah-Hartman , Mark Rutland , linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 2/2] gpio: uniphier: add UniPhier GPIO controller driver Date: Wed, 27 Sep 2017 11:45:43 +0900 Message-Id: <1506480343-9597-3-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506480343-9597-1-git-send-email-yamada.masahiro@socionext.com> References: <1506480343-9597-1-git-send-email-yamada.masahiro@socionext.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This GPIO controller is used on UniPhier SoC family. It also serves as an interrupt controller, but interrupt signals are just delivered to the parent irqchip without any latching or OR'ing. This type of hardware can be well described with hierarchy IRQ domain. One unfortunate thing for this device is that the interrupt mapping to the interrupt parent is not contiguous. I asked how DT can describe interrupt mapping between two irqchips [1], but I could not find a good solution (at least in the framework level). In fact, irqchip drivers using hierarchy domain generally hard-code the DT binding of their parent. After tackling on several approaches such as hard-code of hwirqs, irq_domain_push_irq(), I ended up with a vendor specific property. If we come up with a good idea to support this in the framework, we can migrate over to it, but we can live with a driver-level solution for now. [1] https://lkml.org/lkml/2017/7/6/758 Signed-off-by: Masahiro Yamada --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-uniphier.c | 507 +++++++++++++++++++++++++++++++ include/dt-bindings/gpio/uniphier-gpio.h | 18 ++ 5 files changed, 535 insertions(+) create mode 100644 drivers/gpio/gpio-uniphier.c create mode 100644 include/dt-bindings/gpio/uniphier-gpio.h diff --git a/MAINTAINERS b/MAINTAINERS index 6671f37..47cfca7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2036,6 +2036,7 @@ F: arch/arm/mm/cache-uniphier.c F: arch/arm64/boot/dts/socionext/ F: drivers/bus/uniphier-system-bus.c F: drivers/clk/uniphier/ +F: drivers/gpio/gpio-uniphier.c F: drivers/i2c/busses/i2c-uniphier* F: drivers/irqchip/irq-uniphier-aidet.c F: drivers/pinctrl/uniphier/ diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 3f80f16..25c0f308 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -475,6 +475,14 @@ config GPIO_TZ1090_PDC help Say yes here to support Toumaz Xenif TZ1090 PDC GPIOs. +config GPIO_UNIPHIER + tristate "UniPhier GPIO support" + depends on ARCH_UNIPHIER || COMPILE_TEST + depends on OF_GPIO + select IRQ_DOMAIN_HIERARCHY + help + Say yes here to support UniPhier GPIOs. + config GPIO_VF610 def_bool y depends on ARCH_MXC && SOC_VF610 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index aeb70e9d..472f675 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -131,6 +131,7 @@ obj-$(CONFIG_GPIO_TWL6040) += gpio-twl6040.o obj-$(CONFIG_GPIO_TZ1090) += gpio-tz1090.o obj-$(CONFIG_GPIO_TZ1090_PDC) += gpio-tz1090-pdc.o obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o +obj-$(CONFIG_GPIO_UNIPHIER) += gpio-uniphier.o obj-$(CONFIG_GPIO_VF610) += gpio-vf610.o obj-$(CONFIG_GPIO_VIPERBOARD) += gpio-viperboard.o obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c new file mode 100644 index 0000000..d62cea4 --- /dev/null +++ b/drivers/gpio/gpio-uniphier.c @@ -0,0 +1,507 @@ +/* + * Copyright (C) 2017 Socionext Inc. + * Author: Masahiro Yamada + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define UNIPHIER_GPIO_BANK_MASK \ + GENMASK((UNIPHIER_GPIO_LINES_PER_BANK) - 1, 0) + +#define UNIPHIER_GPIO_IRQ_MAX_NUM 24 + +#define UNIPHIER_GPIO_PORT_DATA 0x0 /* data */ +#define UNIPHIER_GPIO_PORT_DIR 0x4 /* direction (1:in, 0:out) */ +#define UNIPHIER_GPIO_IRQ_EN 0x90 /* irq enable */ +#define UNIPHIER_GPIO_IRQ_MODE 0x94 /* irq mode (1: both edge) */ +#define UNIPHIER_GPIO_IRQ_FLT_EN 0x98 /* noise filter enable */ +#define UNIPHIER_GPIO_IRQ_FLT_CYC 0x9c /* noise filter clock cycle */ + +struct uniphier_gpio_priv { + struct gpio_chip chip; + struct irq_chip irq_chip; + struct irq_domain *domain; + void __iomem *regs; + spinlock_t lock; + u32 saved_vals[0]; +}; + +static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank) +{ + unsigned int reg; + + reg = (bank + 1) * 8; + + /* + * Unfortunately, the GPIO port registers are not contiguous because + * offset 0x90-0x9f is used for IRQ. Add 0x10 when crossing the region. + */ + if (reg >= UNIPHIER_GPIO_IRQ_EN) + reg += 0x10; + + return reg; +} + +static void uniphier_gpio_get_bank_and_mask(unsigned int offset, + unsigned int *bank, u32 *mask) +{ + *bank = offset / UNIPHIER_GPIO_LINES_PER_BANK; + *mask = BIT(offset % UNIPHIER_GPIO_LINES_PER_BANK); +} + +static void uniphier_gpio_reg_update(struct uniphier_gpio_priv *priv, + unsigned int reg, u32 mask, u32 val) +{ + unsigned long flags; + u32 tmp; + + spin_lock_irqsave(&priv->lock, flags); + tmp = readl(priv->regs + reg); + tmp &= ~mask; + tmp |= mask & val; + writel(tmp, priv->regs + reg); + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void uniphier_gpio_bank_write(struct gpio_chip *chip, unsigned int bank, + unsigned int reg, u32 mask, u32 val) +{ + struct uniphier_gpio_priv *priv = gpiochip_get_data(chip); + + if (!mask) + return; + + uniphier_gpio_reg_update(priv, uniphier_gpio_bank_to_reg(bank) + reg, + mask, val); +} + +static void uniphier_gpio_offset_write(struct gpio_chip *chip, + unsigned int offset, unsigned int reg, + int val) +{ + unsigned int bank; + u32 mask; + + uniphier_gpio_get_bank_and_mask(offset, &bank, &mask); + + uniphier_gpio_bank_write(chip, bank, reg, mask, val ? mask : 0); +} + +static int uniphier_gpio_offset_read(struct gpio_chip *chip, + unsigned int offset, unsigned int reg) +{ + struct uniphier_gpio_priv *priv = gpiochip_get_data(chip); + unsigned int bank, reg_offset; + u32 mask; + + uniphier_gpio_get_bank_and_mask(offset, &bank, &mask); + reg_offset = uniphier_gpio_bank_to_reg(bank) + reg; + + return !!(readl(priv->regs + reg_offset) & mask); +} + +static int uniphier_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DIR); +} + +static int uniphier_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 1); + + return 0; +} + +static int uniphier_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int val) +{ + uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val); + uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 0); + + return 0; +} + +static int uniphier_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DATA); +} + +static void uniphier_gpio_set(struct gpio_chip *chip, + unsigned int offset, int val) +{ + uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val); +} + +static void uniphier_gpio_set_multiple(struct gpio_chip *chip, + unsigned long *mask, unsigned long *bits) +{ + unsigned int bank, shift, bank_mask, bank_bits; + int i; + + for (i = 0; i < chip->ngpio; i += UNIPHIER_GPIO_LINES_PER_BANK) { + bank = i / UNIPHIER_GPIO_LINES_PER_BANK; + shift = i % BITS_PER_LONG; + bank_mask = (mask[BIT_WORD(i)] >> shift) & + UNIPHIER_GPIO_BANK_MASK; + bank_bits = bits[BIT_WORD(i)] >> shift; + + uniphier_gpio_bank_write(chip, bank, UNIPHIER_GPIO_PORT_DATA, + bank_mask, bank_bits); + } +} + +static int uniphier_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) +{ + struct irq_fwspec fwspec; + + if (offset < UNIPHIER_GPIO_IRQ_OFFSET) + return -ENXIO; + + fwspec.fwnode = of_node_to_fwnode(chip->parent->of_node); + fwspec.param_count = 2; + fwspec.param[0] = offset - UNIPHIER_GPIO_IRQ_OFFSET; + fwspec.param[1] = IRQ_TYPE_NONE; + + return irq_create_fwspec_mapping(&fwspec); +} + +static void uniphier_gpio_irq_mask(struct irq_data *data) +{ + struct uniphier_gpio_priv *priv = data->chip_data; + u32 mask = BIT(data->hwirq); + + uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, 0); + + return irq_chip_mask_parent(data); +} + +static void uniphier_gpio_irq_unmask(struct irq_data *data) +{ + struct uniphier_gpio_priv *priv = data->chip_data; + u32 mask = BIT(data->hwirq); + + uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, mask); + + return irq_chip_unmask_parent(data); +} + +static int uniphier_gpio_irq_set_type(struct irq_data *data, unsigned int type) +{ + struct uniphier_gpio_priv *priv = data->chip_data; + u32 mask = BIT(data->hwirq); + u32 val = 0; + + if (type == IRQ_TYPE_EDGE_BOTH) { + val = mask; + type = IRQ_TYPE_EDGE_FALLING; + } + + uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_MODE, mask, val); + /* To enable both edge detection, the noise filter must be enabled. */ + uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_FLT_EN, mask, val); + + return irq_chip_set_type_parent(data, type); +} + +static int uniphier_gpio_irq_get_parent_hwirq(struct uniphier_gpio_priv *priv, + unsigned int hwirq) +{ + struct device_node *np = priv->chip.parent->of_node; + const __be32 *range; + u32 base, parent_base, size; + int len; + + range = of_get_property(np, "socionext,interrupt-ranges", &len); + if (!range) + return -EINVAL; + + len /= sizeof(*range); + + for (; len >= 3; len -= 3) { + base = be32_to_cpu(*range++); + parent_base = be32_to_cpu(*range++); + size = be32_to_cpu(*range++); + + if (base <= hwirq && hwirq < base + size) + return hwirq - base + parent_base; + } + + return -ENOENT; +} + +static int uniphier_gpio_irq_domain_translate(struct irq_domain *domain, + struct irq_fwspec *fwspec, + unsigned long *out_hwirq, + unsigned int *out_type) +{ + if (WARN_ON(fwspec->param_count < 2)) + return -EINVAL; + + *out_hwirq = fwspec->param[0]; + *out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; + + return 0; +} + +static int uniphier_gpio_irq_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + struct uniphier_gpio_priv *priv = domain->host_data; + struct irq_fwspec parent_fwspec; + irq_hw_number_t hwirq; + unsigned int type; + int ret; + + if (WARN_ON(nr_irqs != 1)) + return -EINVAL; + + ret = uniphier_gpio_irq_domain_translate(domain, arg, &hwirq, &type); + if (ret) + return ret; + + ret = uniphier_gpio_irq_get_parent_hwirq(priv, hwirq); + if (ret < 0) + return ret; + + /* parent is UniPhier AIDET */ + parent_fwspec.fwnode = domain->parent->fwnode; + parent_fwspec.param_count = 2; + parent_fwspec.param[0] = ret; + parent_fwspec.param[1] = (type == IRQ_TYPE_EDGE_BOTH) ? + IRQ_TYPE_EDGE_FALLING : type; + + ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, + &priv->irq_chip, priv); + if (ret) + return ret; + + return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec); +} + +static void uniphier_gpio_irq_domain_activate(struct irq_domain *domain, + struct irq_data *data) +{ + struct uniphier_gpio_priv *priv = domain->host_data; + struct gpio_chip *chip = &priv->chip; + + gpiochip_lock_as_irq(chip, data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET); +} + +static void uniphier_gpio_irq_domain_deactivate(struct irq_domain *domain, + struct irq_data *data) +{ + struct uniphier_gpio_priv *priv = domain->host_data; + struct gpio_chip *chip = &priv->chip; + + gpiochip_unlock_as_irq(chip, data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET); +} + +static const struct irq_domain_ops uniphier_gpio_irq_domain_ops = { + .alloc = uniphier_gpio_irq_domain_alloc, + .free = irq_domain_free_irqs_common, + .activate = uniphier_gpio_irq_domain_activate, + .deactivate = uniphier_gpio_irq_domain_deactivate, + .translate = uniphier_gpio_irq_domain_translate, +}; + +static void uniphier_gpio_hw_init(struct uniphier_gpio_priv *priv) +{ + /* + * Due to the hardware design, the noise filter must be enabled to + * detect both edge interrupts. This filter is intended to remove the + * noise from the irq lines. It does not work for GPIO input, so GPIO + * debounce is not supported. Unfortunately, the filter period is + * shared among all irq lines. Just choose a sensible period here. + */ + writel(0xff, priv->regs + UNIPHIER_GPIO_IRQ_FLT_CYC); +} + +static unsigned int uniphier_gpio_get_nbanks(unsigned int ngpio) +{ + return DIV_ROUND_UP(ngpio, UNIPHIER_GPIO_LINES_PER_BANK); +} + +static int uniphier_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *parent_np; + struct irq_domain *parent_domain; + struct uniphier_gpio_priv *priv; + struct gpio_chip *chip; + struct irq_chip *irq_chip; + struct resource *regs; + unsigned int nregs; + u32 ngpios; + int ret; + + parent_np = of_irq_find_parent(dev->of_node); + if (!parent_np) + return -ENXIO; + + parent_domain = irq_find_host(parent_np); + of_node_put(parent_np); + if (!parent_domain) + return -EPROBE_DEFER; + + ret = of_property_read_u32(dev->of_node, "ngpios", &ngpios); + if (ret) + return ret; + + nregs = uniphier_gpio_get_nbanks(ngpios) * 2 + 3; + priv = devm_kzalloc(dev, + sizeof(*priv) + sizeof(priv->saved_vals[0]) * nregs, + GFP_KERNEL); + if (!priv) + return -ENOMEM; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->regs = devm_ioremap_resource(dev, regs); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + spin_lock_init(&priv->lock); + + chip = &priv->chip; + chip->label = dev_name(dev); + chip->parent = dev; + chip->request = gpiochip_generic_request; + chip->free = gpiochip_generic_free; + chip->get_direction = uniphier_gpio_get_direction; + chip->direction_input = uniphier_gpio_direction_input; + chip->direction_output = uniphier_gpio_direction_output; + chip->get = uniphier_gpio_get; + chip->set = uniphier_gpio_set; + chip->set_multiple = uniphier_gpio_set_multiple; + chip->to_irq = uniphier_gpio_to_irq; + chip->base = -1; + chip->ngpio = ngpios; + + irq_chip = &priv->irq_chip; + irq_chip->name = dev_name(dev); + irq_chip->irq_mask = uniphier_gpio_irq_mask; + irq_chip->irq_unmask = uniphier_gpio_irq_unmask; + irq_chip->irq_eoi = irq_chip_eoi_parent; + irq_chip->irq_set_affinity = irq_chip_set_affinity_parent; + irq_chip->irq_set_type = uniphier_gpio_irq_set_type; + + uniphier_gpio_hw_init(priv); + + ret = devm_gpiochip_add_data(dev, chip, priv); + if (ret) + return ret; + + priv->domain = irq_domain_create_hierarchy( + parent_domain, 0, + UNIPHIER_GPIO_IRQ_MAX_NUM, + of_node_to_fwnode(dev->of_node), + &uniphier_gpio_irq_domain_ops, priv); + if (!priv->domain) + return -ENOMEM; + + platform_set_drvdata(pdev, priv); + + return 0; +} + +static int uniphier_gpio_remove(struct platform_device *pdev) +{ + struct uniphier_gpio_priv *priv = platform_get_drvdata(pdev); + + irq_domain_remove(priv->domain); + + return 0; +} + +static int __maybe_unused uniphier_gpio_suspend(struct device *dev) +{ + struct uniphier_gpio_priv *priv = dev_get_drvdata(dev); + unsigned int nbanks = uniphier_gpio_get_nbanks(priv->chip.ngpio); + u32 *val = priv->saved_vals; + unsigned int reg; + int i; + + for (i = 0; i < nbanks; i++) { + reg = uniphier_gpio_bank_to_reg(i); + + *val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DATA); + *val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DIR); + } + + *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_EN); + *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_MODE); + *val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN); + + return 0; +} + +static int __maybe_unused uniphier_gpio_resume(struct device *dev) +{ + struct uniphier_gpio_priv *priv = dev_get_drvdata(dev); + unsigned int nbanks = uniphier_gpio_get_nbanks(priv->chip.ngpio); + const u32 *val = priv->saved_vals; + unsigned int reg; + int i; + + for (i = 0; i < nbanks; i++) { + reg = uniphier_gpio_bank_to_reg(i); + + writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DATA); + writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DIR); + } + + writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_EN); + writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_MODE); + writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN); + + uniphier_gpio_hw_init(priv); + + return 0; +} + +static const struct dev_pm_ops uniphier_gpio_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(uniphier_gpio_suspend, + uniphier_gpio_resume) +}; + +static const struct of_device_id uniphier_gpio_match[] = { + { .compatible = "socionext,uniphier-gpio" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, uniphier_gpio_match); + +static struct platform_driver uniphier_gpio_driver = { + .probe = uniphier_gpio_probe, + .remove = uniphier_gpio_remove, + .driver = { + .name = "uniphier-gpio", + .of_match_table = uniphier_gpio_match, + .pm = &uniphier_gpio_pm_ops, + }, +}; +module_platform_driver(uniphier_gpio_driver); + +MODULE_AUTHOR("Masahiro Yamada "); +MODULE_DESCRIPTION("UniPhier GPIO driver"); +MODULE_LICENSE("GPL"); diff --git a/include/dt-bindings/gpio/uniphier-gpio.h b/include/dt-bindings/gpio/uniphier-gpio.h new file mode 100644 index 0000000..9f0ad17 --- /dev/null +++ b/include/dt-bindings/gpio/uniphier-gpio.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2017 Socionext Inc. + * Author: Masahiro Yamada + */ + +#ifndef _DT_BINDINGS_GPIO_UNIPHIER_H +#define _DT_BINDINGS_GPIO_UNIPHIER_H + +#define UNIPHIER_GPIO_LINES_PER_BANK 8 + +#define UNIPHIER_GPIO_IRQ_OFFSET ((UNIPHIER_GPIO_LINES_PER_BANK) * 15) + +#define UNIPHIER_GPIO_PORT(bank, line) \ + ((UNIPHIER_GPIO_LINES_PER_BANK) * (bank) + (line)) + +#define UNIPHIER_GPIO_IRQ(n) ((UNIPHIER_GPIO_IRQ_OFFSET) + (n)) + +#endif /* _DT_BINDINGS_GPIO_UNIPHIER_H */