From patchwork Thu Mar 17 01:24:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12783397 X-Patchwork-Delegate: geert@linux-m68k.org 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 B485EC4321E for ; Thu, 17 Mar 2022 01:24:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358284AbiCQBZt (ORCPT ); Wed, 16 Mar 2022 21:25:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358285AbiCQBZp (ORCPT ); Wed, 16 Mar 2022 21:25:45 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2B1AF1E3DC; Wed, 16 Mar 2022 18:24:28 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.90,187,1643641200"; d="scan'208";a="113753459" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 17 Mar 2022 10:24:27 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 9440141A45D9; Thu, 17 Mar 2022 10:24:24 +0900 (JST) From: Lad Prabhakar To: Thomas Gleixner , Marc Zyngier , Rob Herring , Linus Walleij , Bartosz Golaszewski , Geert Uytterhoeven , Philipp Zabel Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [RFC PATCH v4 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO interrupt Date: Thu, 17 Mar 2022 01:24:04 +0000 Message-Id: <20220317012404.8069-6-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220317012404.8069-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220317012404.8069-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Add IRQ domian to RZ/G2L pinctrl driver to handle GPIO interrupt. GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be used as IRQ lines at given time. Selection of pins as IRQ lines is handled by IA55 (which is the IRQC block) which sits in between the GPIO and GIC. Signed-off-by: Lad Prabhakar --- drivers/pinctrl/renesas/pinctrl-rzg2l.c | 205 ++++++++++++++++++++++++ 1 file changed, 205 insertions(+) diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c index ccee9c9e2e22..d5bc8b73e514 100644 --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c @@ -9,8 +9,10 @@ #include #include #include +#include #include #include +#include #include #include #include @@ -89,6 +91,7 @@ #define PIN(n) (0x0800 + 0x10 + (n)) #define IOLH(n) (0x1000 + (n) * 8) #define IEN(n) (0x1800 + (n) * 8) +#define ISEL(n) (0x2C80 + (n) * 8) #define PWPR (0x3014) #define SD_CH(n) (0x3000 + (n) * 4) #define QSPI (0x3008) @@ -112,6 +115,10 @@ #define RZG2L_PIN_ID_TO_PORT_OFFSET(id) (RZG2L_PIN_ID_TO_PORT(id) + 0x10) #define RZG2L_PIN_ID_TO_PIN(id) ((id) % RZG2L_PINS_PER_PORT) +#define RZG2L_TINT_MAX_INTERRUPT 32 +#define RZG2L_TINT_IRQ_START_INDEX 9 +#define RZG2L_PACK_HWIRQ(t, i) (((t) << 16) | (i)) + struct rzg2l_dedicated_configs { const char *name; u32 config; @@ -137,6 +144,9 @@ struct rzg2l_pinctrl { struct gpio_chip gpio_chip; struct pinctrl_gpio_range gpio_range; + DECLARE_BITMAP(tint_slot, RZG2L_TINT_MAX_INTERRUPT); + spinlock_t bitmap_lock; + unsigned int hwirq[RZG2L_TINT_MAX_INTERRUPT]; spinlock_t lock; }; @@ -883,6 +893,8 @@ static int rzg2l_gpio_get(struct gpio_chip *chip, unsigned int offset) static void rzg2l_gpio_free(struct gpio_chip *chip, unsigned int offset) { + unsigned int virq; + pinctrl_gpio_free(chip->base + offset); /* @@ -890,6 +902,10 @@ static void rzg2l_gpio_free(struct gpio_chip *chip, unsigned int offset) * drive the GPIO pin as an output. */ rzg2l_gpio_direction_input(chip, offset); + + virq = irq_find_mapping(chip->irq.domain, offset); + if (virq) + irq_dispose_mapping(virq); } static const char * const rzg2l_gpio_names[] = { @@ -1075,14 +1091,193 @@ static struct rzg2l_dedicated_configs rzg2l_dedicated_pins[] = { { "RIIC1_SCL", RZG2L_SINGLE_PIN_PACK(0xe, 3, PIN_CFG_IEN) }, }; +static int rzg2l_gpio_get_gpioint(unsigned int virq) +{ + unsigned int gpioint = 0; + unsigned int i = 0; + u32 port, bit; + + port = virq / 8; + bit = virq % 8; + + if (port >= ARRAY_SIZE(rzg2l_gpio_configs)) + return -EINVAL; + + for (i = 0; i < port; i++) + gpioint += RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[i]); + + if (bit >= RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[i])) + return -EINVAL; + + gpioint += bit; + + return gpioint; +} + +static void rzg2l_gpio_irq_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *d; + + d = irq_domain_get_irq_data(domain, virq); + if (d) { + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + unsigned long flags; + unsigned int i; + + for (i = 0; i < RZG2L_TINT_MAX_INTERRUPT; i++) { + if (pctrl->hwirq[i] == hwirq) { + spin_lock_irqsave(&pctrl->bitmap_lock, flags); + bitmap_release_region(pctrl->tint_slot, i, get_order(1)); + spin_unlock_irqrestore(&pctrl->bitmap_lock, flags); + pctrl->hwirq[i] = 0; + break; + } + } + } + irq_domain_free_irqs_common(domain, virq, nr_irqs); +} + +static void rzg2l_gpio_irq_disable(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip); + unsigned int hwirq = irqd_to_hwirq(d); + unsigned long flags; + void __iomem *addr; + u32 port; + u8 bit; + + port = RZG2L_PIN_ID_TO_PORT(hwirq); + bit = RZG2L_PIN_ID_TO_PIN(hwirq); + + addr = pctrl->base + ISEL(port); + if (bit >= 4) { + bit -= 4; + addr += 4; + } + + spin_lock_irqsave(&pctrl->lock, flags); + writel(readl(addr) & ~BIT(bit * 8), addr); + spin_unlock_irqrestore(&pctrl->lock, flags); + + irq_chip_disable_parent(d); +} + +static void rzg2l_gpio_irq_enable(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct rzg2l_pinctrl *pctrl = container_of(gc, struct rzg2l_pinctrl, gpio_chip); + unsigned int hwirq = irqd_to_hwirq(d); + unsigned long flags; + void __iomem *addr; + u32 port; + u8 bit; + + port = RZG2L_PIN_ID_TO_PORT(hwirq); + bit = RZG2L_PIN_ID_TO_PIN(hwirq); + + addr = pctrl->base + ISEL(port); + if (bit >= 4) { + bit -= 4; + addr += 4; + } + + spin_lock_irqsave(&pctrl->lock, flags); + writel(readl(addr) | BIT(bit * 8), addr); + spin_unlock_irqrestore(&pctrl->lock, flags); + + irq_chip_enable_parent(d); +} + +static int rzg2l_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + return irq_chip_set_type_parent(d, type); +} + +static void rzg2l_gpio_irqc_eoi(struct irq_data *d) +{ + irq_chip_eoi_parent(d); +} + +static struct irq_chip rzg2l_gpio_irqchip = { + .name = "rzg2l-gpio", + .irq_disable = rzg2l_gpio_irq_disable, + .irq_enable = rzg2l_gpio_irq_enable, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_set_type = rzg2l_gpio_irq_set_type, + .irq_eoi = rzg2l_gpio_irqc_eoi, +}; + +static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc, + unsigned int child, + unsigned int child_type, + unsigned int *parent, + unsigned int *parent_type) +{ + struct rzg2l_pinctrl *pctrl = gpiochip_get_data(gc); + unsigned long flags; + int gpioint, irq; + + gpioint = rzg2l_gpio_get_gpioint(child); + if (gpioint < 0) + return gpioint; + + spin_lock_irqsave(&pctrl->bitmap_lock, flags); + irq = bitmap_find_free_region(pctrl->tint_slot, RZG2L_TINT_MAX_INTERRUPT, get_order(1)); + spin_unlock_irqrestore(&pctrl->bitmap_lock, flags); + if (irq < 0) + return -ENOSPC; + pctrl->hwirq[irq] = child; + irq += RZG2L_TINT_IRQ_START_INDEX; + + /* All these interrupts are level high in the CPU */ + *parent_type = IRQ_TYPE_LEVEL_HIGH; + *parent = RZG2L_PACK_HWIRQ(gpioint, irq); + return 0; +} + +static void *rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip, + unsigned int parent_hwirq, + unsigned int parent_type) +{ + struct irq_fwspec *fwspec; + + fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL); + if (!fwspec) + return NULL; + + fwspec->fwnode = chip->irq.parent_domain->fwnode; + fwspec->param_count = 2; + fwspec->param[0] = parent_hwirq; + fwspec->param[1] = parent_type; + + return fwspec; +} + static int rzg2l_gpio_register(struct rzg2l_pinctrl *pctrl) { struct device_node *np = pctrl->dev->of_node; struct gpio_chip *chip = &pctrl->gpio_chip; const char *name = dev_name(pctrl->dev); + struct irq_domain *parent_domain; struct of_phandle_args of_args; + struct device_node *parent_np; + struct gpio_irq_chip *girq; int ret; + parent_np = of_irq_find_parent(np); + 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_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &of_args); if (ret) { dev_err(pctrl->dev, "Unable to parse gpio-ranges\n"); @@ -1109,6 +1304,15 @@ static int rzg2l_gpio_register(struct rzg2l_pinctrl *pctrl) chip->base = -1; chip->ngpio = of_args.args[2]; + girq = &chip->irq; + girq->chip = &rzg2l_gpio_irqchip; + girq->fwnode = of_node_to_fwnode(np); + girq->parent_domain = parent_domain; + girq->child_to_parent_hwirq = rzg2l_gpio_child_to_parent_hwirq; + girq->populate_parent_alloc_arg = rzg2l_gpio_populate_parent_fwspec; + girq->child_irq_domain_ops.free = rzg2l_gpio_irq_domain_free; + girq->ngirq = RZG2L_TINT_MAX_INTERRUPT; + pctrl->gpio_range.id = 0; pctrl->gpio_range.pin_base = 0; pctrl->gpio_range.base = 0; @@ -1224,6 +1428,7 @@ static int rzg2l_pinctrl_probe(struct platform_device *pdev) } spin_lock_init(&pctrl->lock); + spin_lock_init(&pctrl->bitmap_lock); platform_set_drvdata(pdev, pctrl);