From patchwork Mon Nov 28 06:42:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinbo Zhu X-Patchwork-Id: 629087 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2DC9C4321E for ; Mon, 28 Nov 2022 06:43:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229685AbiK1GnP (ORCPT ); Mon, 28 Nov 2022 01:43:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229571AbiK1GnN (ORCPT ); Mon, 28 Nov 2022 01:43:13 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 414755580; Sun, 27 Nov 2022 22:43:10 -0800 (PST) Received: from loongson.cn (unknown [10.180.13.64]) by gateway (Coremail) with SMTP id _____8BxVPB8WIRjppgBAA--.3935S3; Mon, 28 Nov 2022 14:43:08 +0800 (CST) Received: from localhost.localdomain (unknown [10.180.13.64]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxLuJ2WIRjVQwdAA--.8588S2; Mon, 28 Nov 2022 14:43:07 +0800 (CST) From: Yinbo Zhu To: Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , WANG Xuerui , Jiaxun Yang , Thomas Bogendoerfer , Juxin Gao , Bibo Mao , Yanteng Si , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, Arnaud Patard , Huacai Chen , Yinbo Zhu Cc: Jianmin Lv , Hongchen Zhang , Liu Peibao Subject: [PATCH v8 1/2] gpio: loongson: add gpio driver support Date: Mon, 28 Nov 2022 14:42:59 +0800 Message-Id: <20221128064300.12021-1-zhuyinbo@loongson.cn> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxLuJ2WIRjVQwdAA--.8588S2 X-CM-SenderInfo: 52kx5xhqerqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBjvAXoWfGw1kWrWrWr1UZr1kJr1rCrg_yoW8XFykCo W7WFZ8WrW8Wr17JayFq3WSqF47ZFn0qF10ywnakan8Ca15tr98Jry3C3y3XFy0vF1FgFy7 ZFyfur4fGFsrtF4Dn29KB7ZKAUJUUUUf529EdanIXcx71UUUUU7KY7ZEXasCq-sGcSsGvf J3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnRJU UUBY1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFV AK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWUCVW8JwA2 z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr 1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1ln4kS14v26r126r1DM2AIxVAIcxkE cVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F4 0Ex7xfMcIj6xIIjxv20xvE14v26r126r1DMcIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC 6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2 Ij64vIr41l42xK82IY6x8ErcxFaVAv8VWrMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI 1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_Jr Wlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1I 6r4UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr 0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUv cSsGvfC2KfnxnUUI43ZEXa7IU8-4S5UUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The Loongson platforms GPIO controller contains 60 GPIO pins in total, 4 of which are dedicated GPIO pins, and the remaining 56 are reused with other functions. Each GPIO can set input/output and has the interrupt capability. This driver added support for Loongson GPIO controller and support to use DTS or ACPI to descibe GPIO device resources. Signed-off-by: Jianmin Lv Signed-off-by: Hongchen Zhang Signed-off-by: Liu Peibao Signed-off-by: Juxin Gao Signed-off-by: Yinbo Zhu --- Change in v8: 1. Return the loongson_gpio_init function directly in probe. Change in v7: 1. Add the gpio irqchip support. 2. Replace __set_direction with loongson_commit_direction. 3. Replace __set_level with loongson_commit_level. 4. Remove the parser of gsi_idx_map. 5. Add the support_irq flag. 6. Replace string platform_data with chip_data. 7. Remove the loongson_gpio_request. Change in v6: 1. Remove the bit mode keep byte mode in all function except loongson_gpio_init. 2. Use bgpio_init replace bit mode. 3. Implement the function loongson_gpio_get_direction for byte mode. 4. Set ngpios after call bgpio_init. 5. Use gpio-loongson-64bit.c as driver filename. 6. Ignore that loongson legacy drvier and remove the patch about "gpio: loongson2ef: move driver to original location". Change in v5: 1. Move legacy gpio driver to proper location. 2. Remove the "gpio_base". 3. Add of_device_id and acpi_device_id data field for platform data. 4. Remove the ACPI_PTR(). 5. Remove the gpio label judgement logic and use mode instead. 6. Drop platform_loongson_gpio_get_props. 7. Using devres for all resource. 8. Remove the loongson_gpio_remove. 9. Remove the unmatched print information. 10. Remove the loongson_gpio_exit. Change in v4: 1. Fixup name spelling about Signed-off-by. 2. Drop "series" here and everywhere else. 3. Fixup the copyright in driver. 4. Drop the "else" in loongson_gpio_request. 5. Use trinocular operation replace the related logic. 6. Remove lable judgement in context about "lgpio->chip.to_irq = loongson_gpio_to_irq" 7. Use dev_err replace pr_err in probe. 8. Make legacy platform_data should be left out of this patch. 9. Remove the mips config in gpio Kconfig. Change in v3: 1. Move the gpio platform data struct from arch/ into include/linux/ platform_data/. 2. Replace platform_gpio_data with loongson_gpio_platform_data in .c. 3. Add maintainer in MAINTAINERS file for include/linux/platform_data/ gpio-loongson.h and gpio-loongson.c Change in v2: 1. Fixup of_loongson_gpio_get_props and remove the parse logic about "loongson,conf_offset", "loongson,out_offset", "loongson,in_offset", "loongson,gpio_base", "loongson,support_irq" then kernel driver will initial them that depend compatible except "loongson,gpio_base". MAINTAINERS | 6 + drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-loongson-64bit.c | 378 +++++++++++++++++++++++++++++ 4 files changed, 397 insertions(+) create mode 100644 drivers/gpio/gpio-loongson-64bit.c diff --git a/MAINTAINERS b/MAINTAINERS index 5114db9c8f32..2854da69cabb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12051,6 +12051,12 @@ S: Maintained F: Documentation/devicetree/bindings/hwinfo/loongson,ls2k-chipid.yaml F: drivers/soc/loongson/loongson2_guts.c +LOONGSON GPIO DRIVER +M: Yinbo Zhu +L: linux-gpio@vger.kernel.org +S: Maintained +F: drivers/gpio/gpio-loongson-64bit.c + LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI) M: Sathya Prakash M: Sreekanth Reddy diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index a01af1180616..d3e2380dbacf 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -381,6 +381,18 @@ config GPIO_LOONGSON help Driver for GPIO functionality on Loongson-2F/3A/3B processors. +config GPIO_LOONGSON_64BIT + tristate "Loongson 64 bit GPIO support" + depends on LOONGARCH || COMPILE_TEST + select GPIO_GENERIC + select GPIOLIB_IRQCHIP + help + Say yes here to support the GPIO functionality of a number of + Loongson series of chips. The Loongson GPIO controller supports + up to 60 GPIOS in total, 4 of which are dedicated GPIO pins, and + the remaining 56 are reused with other functions, with edge or + level triggered interrupts. + config GPIO_LPC18XX tristate "NXP LPC18XX/43XX GPIO support" default y if ARCH_LPC18XX diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 29e3beb6548c..fc832484cc77 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -78,6 +78,7 @@ obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o +obj-$(CONFIG_GPIO_LOONGSON_64BIT) += gpio-loongson-64bit.o obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o diff --git a/drivers/gpio/gpio-loongson-64bit.c b/drivers/gpio/gpio-loongson-64bit.c new file mode 100644 index 000000000000..19a0149480f8 --- /dev/null +++ b/drivers/gpio/gpio-loongson-64bit.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Loongson GPIO Support + * + * Copyright (C) 2022 Loongson Technology Corporation Limited + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LOONGSON_GPIO_IN(x) (x->reg_base +\ + x->p_data->in_offset) +#define LOONGSON_GPIO_OUT(x) (x->reg_base +\ + x->p_data->out_offset) +#define LOONGSON_GPIO_OEN(x) (x->reg_base +\ + x->p_data->conf_offset) +#define LOONGSON_GPIO_IN_BYTE(x, gpio) (x->reg_base +\ + x->p_data->in_offset + gpio) +#define LOONGSON_GPIO_OUT_BYTE(x, gpio) (x->reg_base +\ + x->p_data->out_offset + gpio) +#define LOONGSON_GPIO_OEN_BYTE(x, gpio) (x->reg_base +\ + x->p_data->conf_offset + gpio) + +enum loongson_gpio_mode { + BIT_CTRL_MODE, + BYTE_CTRL_MODE, +}; + +struct loongson_gpio_chip_data { + const char *label; + enum loongson_gpio_mode mode; + int conf_offset; + int out_offset; + int in_offset; + bool support_irq; +}; + +struct loongson_gpio_chip { + struct gpio_chip chip; + struct fwnode_handle *fwnode; + spinlock_t lock; + void __iomem *reg_base; + const struct loongson_gpio_chip_data *p_data; +}; + +static inline void loongson_commit_direction( + struct loongson_gpio_chip *lgpio, + unsigned int pin, int input) +{ + u8 bval; + + bval = input ? 1 : 0; + writeb(bval, LOONGSON_GPIO_OEN_BYTE(lgpio, pin)); +} + +static void loongson_commit_level(struct loongson_gpio_chip *lgpio, + unsigned int pin, int high) +{ + u8 bval; + + bval = high ? 1 : 0; + writeb(bval, LOONGSON_GPIO_OUT_BYTE(lgpio, pin)); +} + +static int loongson_gpio_direction_input( + struct gpio_chip *chip, unsigned int pin) +{ + unsigned long flags; + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + + spin_lock_irqsave(&lgpio->lock, flags); + loongson_commit_direction(lgpio, pin, 1); + spin_unlock_irqrestore(&lgpio->lock, flags); + + return 0; +} + +static int loongson_gpio_direction_output( + struct gpio_chip *chip, unsigned int pin, + int value) +{ + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + unsigned long flags; + + spin_lock_irqsave(&lgpio->lock, flags); + loongson_commit_level(lgpio, pin, value); + loongson_commit_direction(lgpio, pin, 0); + spin_unlock_irqrestore(&lgpio->lock, flags); + + return 0; +} + +static int loongson_gpio_get(struct gpio_chip *chip, unsigned int pin) +{ + u8 bval; + int val; + + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + + bval = readb(LOONGSON_GPIO_IN_BYTE(lgpio, pin)); + val = bval & 1; + + return val; +} + +static int loongson_gpio_get_direction( + struct gpio_chip *chip, unsigned int pin) +{ + u8 bval; + int val; + + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + + bval = readb(LOONGSON_GPIO_OEN_BYTE(lgpio, pin)); + val = bval & 1; + + return val; +} + +static void loongson_gpio_set(struct gpio_chip *chip, unsigned int pin, + int value) +{ + unsigned long flags; + struct loongson_gpio_chip *lgpio = + container_of(chip, struct loongson_gpio_chip, chip); + + spin_lock_irqsave(&lgpio->lock, flags); + loongson_commit_level(lgpio, pin, value); + spin_unlock_irqrestore(&lgpio->lock, flags); +} + +static int loongson_gpio_to_irq( + struct gpio_chip *chip, unsigned int offset) +{ + struct platform_device *pdev = + container_of(chip->parent, struct platform_device, dev); + + if (offset >= chip->ngpio) + return -EINVAL; + + return platform_get_irq(pdev, offset); +} + +static void loongson_gpio_irq_ack(struct irq_data *d) +{ + irq_chip_ack_parent(d); +} + +static void loongson_gpio_mask_irq(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + + irq_chip_mask_parent(d); + gpiochip_disable_irq(gc, d->hwirq); +} + +static void loongson_gpio_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + + gpiochip_enable_irq(gc, d->hwirq); + irq_chip_unmask_parent(d); +} + +static int loongson_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + switch (type) { + case IRQ_TYPE_EDGE_RISING: + irq_set_handler_locked(d, handle_edge_irq); + break; + case IRQ_TYPE_EDGE_FALLING: + irq_set_handler_locked(d, handle_edge_irq); + break; + case IRQ_TYPE_LEVEL_HIGH: + irq_set_handler_locked(d, handle_level_irq); + break; + case IRQ_TYPE_LEVEL_LOW: + irq_set_handler_locked(d, handle_level_irq); + break; + case IRQ_TYPE_EDGE_BOTH: + irq_set_handler_locked(d, handle_edge_irq); + break; + case IRQ_TYPE_NONE: + default: + return -EINVAL; + } + + return irq_chip_set_type_parent(d, type); +} + +static const struct irq_chip loongson_gpio_irqchip = { + .name = "loongson-gpio-irqchip", + .irq_ack = loongson_gpio_irq_ack, + .irq_mask = loongson_gpio_mask_irq, + .irq_unmask = loongson_gpio_irq_unmask, + .irq_set_type = loongson_gpio_irq_set_type, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int loongson_gpio_child_to_parent_hwirq(struct gpio_chip *gc, + unsigned int child, + unsigned int child_type, + unsigned int *parent, + unsigned int *parent_type) +{ + *parent_type = child_type; + + /* GPIO lines 0..3 have dedicated IRQs */ + if (child >= 0 && child <= 3) { + *parent = child + 60; + return 0; + } + + if (child >= 4 && child <= 31) { + *parent = 58; + return 0; + } + + if (child >= 32 && child <= 63) { + *parent = 59; + return 0; + } + + return -EINVAL; +} + +static int loongson_gpio_init( + struct device *dev, struct loongson_gpio_chip *lgpio, + struct device_node *np, void __iomem *reg_base) +{ + int ret; + u32 ngpios; + struct irq_domain __maybe_unused *parent; + struct gpio_irq_chip __maybe_unused *girq; + struct device_node __maybe_unused *irq_parent; + + lgpio->reg_base = reg_base; + + if (lgpio->p_data->mode == BIT_CTRL_MODE) { + ret = bgpio_init(&lgpio->chip, dev, 8, + LOONGSON_GPIO_IN(lgpio), + LOONGSON_GPIO_OUT(lgpio), 0, + LOONGSON_GPIO_OEN(lgpio), NULL, 0); + if (ret) { + dev_err(dev, "unable to init generic GPIO\n"); + return ret; + } + } else { + lgpio->chip.direction_input = loongson_gpio_direction_input; + lgpio->chip.get = loongson_gpio_get; + lgpio->chip.get_direction = loongson_gpio_get_direction; + lgpio->chip.direction_output = loongson_gpio_direction_output; + lgpio->chip.set = loongson_gpio_set; + lgpio->chip.can_sleep = 0; + lgpio->chip.of_node = np; + lgpio->chip.parent = dev; + spin_lock_init(&lgpio->lock); + } + + device_property_read_u32(dev, "ngpios", &ngpios); + + lgpio->chip.ngpio = ngpios; + lgpio->chip.label = lgpio->p_data->label; + + if (lgpio->p_data->support_irq == true) { + lgpio->chip.to_irq = loongson_gpio_to_irq; + irq_parent = of_irq_find_parent(np); + if (irq_parent) + parent = irq_find_host(irq_parent); + + lgpio->fwnode = of_node_to_fwnode(np); + + girq = &lgpio->chip.irq; + gpio_irq_chip_set_chip(girq, &loongson_gpio_irqchip); + girq->fwnode = lgpio->fwnode; + girq->parent_domain = parent; + girq->child_to_parent_hwirq = loongson_gpio_child_to_parent_hwirq; + girq->handler = handle_bad_irq; + girq->default_type = IRQ_TYPE_NONE; + } + + devm_gpiochip_add_data(dev, &lgpio->chip, lgpio); + + return 0; +} + +static int loongson_gpio_probe(struct platform_device *pdev) +{ + void __iomem *reg_base; + struct loongson_gpio_chip *lgpio; + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + + lgpio = devm_kzalloc(dev, sizeof(*lgpio), GFP_KERNEL); + if (!lgpio) + return -ENOMEM; + + lgpio->p_data = device_get_match_data(&pdev->dev); + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg_base)) + return PTR_ERR(reg_base); + + return loongson_gpio_init(dev, lgpio, np, reg_base); +} + +static const struct loongson_gpio_chip_data loongson_gpio_pdata0 = { + .label = "ls2k_gpio", + .mode = BIT_CTRL_MODE, + .conf_offset = 0x0, + .in_offset = 0x10, + .out_offset = 0x20, + .support_irq = true, +}; + +static const struct loongson_gpio_chip_data loongson_gpio_pdata1 = { + .label = "ls7a_gpio", + .mode = BYTE_CTRL_MODE, + .conf_offset = 0x800, + .in_offset = 0x900, + .out_offset = 0xa00, + .support_irq = false, +}; + +static const struct of_device_id loongson_gpio_of_match[] = { + { + .compatible = "loongson,ls2k-gpio", + .data = &loongson_gpio_pdata0, + }, + { + .compatible = "loongson,ls7a-gpio", + .data = &loongson_gpio_pdata1, + }, + {} +}; +MODULE_DEVICE_TABLE(of, loongson_gpio_of_match); + +static const struct acpi_device_id loongson_gpio_acpi_match[] = { + { + .id = "LOON0002", + .driver_data = (kernel_ulong_t)&loongson_gpio_pdata1, + }, + {} +}; +MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match); + +static struct platform_driver loongson_gpio_driver = { + .driver = { + .name = "loongson-gpio", + .owner = THIS_MODULE, + .of_match_table = loongson_gpio_of_match, + .acpi_match_table = loongson_gpio_acpi_match, + }, + .probe = loongson_gpio_probe, +}; + +static int __init loongson_gpio_setup(void) +{ + return platform_driver_register(&loongson_gpio_driver); +} +postcore_initcall(loongson_gpio_setup); + +MODULE_DESCRIPTION("Loongson gpio driver"); +MODULE_LICENSE("GPL");