From patchwork Sat Jun 25 20:06:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar Mahadev Lad X-Patchwork-Id: 585220 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 78848CCA481 for ; Sat, 25 Jun 2022 20:07:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233241AbiFYUHF (ORCPT ); Sat, 25 Jun 2022 16:07:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233461AbiFYUHE (ORCPT ); Sat, 25 Jun 2022 16:07:04 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1C02C140C6; Sat, 25 Jun 2022 13:07:02 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.92,222,1650898800"; d="scan'208";a="125645686" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 26 Jun 2022 05:07:01 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 8D2C3400DB74; Sun, 26 Jun 2022 05:06:57 +0900 (JST) From: Lad Prabhakar To: Marc Zyngier , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Geert Uytterhoeven , Linus Walleij , Bartosz Golaszewski , Philipp Zabel , linux-gpio@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v6 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO interrupt Date: Sat, 25 Jun 2022 21:06:00 +0100 Message-Id: <20220625200600.7582-6-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220625200600.7582-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220625200600.7582-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add IRQ domain 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 a 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 | 236 ++++++++++++++++++++++++ 1 file changed, 236 insertions(+) diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c index c3cdf52b7294..ea78f992a09f 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; }; @@ -885,8 +895,14 @@ 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); + virq = irq_find_mapping(chip->irq.domain, offset); + if (virq) + irq_dispose_mapping(virq); + /* * Set the GPIO as an input to ensure that the next GPIO request won't * drive the GPIO pin as an output. @@ -1106,14 +1122,224 @@ static struct { } }; +static int rzg2l_gpio_get_gpioint(unsigned int virq) +{ + unsigned int gpioint; + unsigned int i; + u32 port, bit; + + port = virq / 8; + bit = virq % 8; + + if (port >= ARRAY_SIZE(rzg2l_gpio_configs) || + bit >= RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[port])) + return -EINVAL; + + gpioint = bit; + for (i = 0; i < port; i++) + gpioint += RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[i]); + + return gpioint; +} + +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); + + gpiochip_disable_irq(gc, hwirq); + 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; + + gpiochip_enable_irq(gc, hwirq); + + 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 void rzg2l_gpio_irq_print_chip(struct irq_data *data, struct seq_file *p) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + + seq_printf(p, dev_name(gc->parent)); +} + +static const 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, + .irq_print_chip = rzg2l_gpio_irq_print_chip, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +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 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_init_irq_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct rzg2l_pinctrl *pctrl = gpiochip_get_data(gc); + struct gpio_chip *chip = &pctrl->gpio_chip; + unsigned int offset; + + /* Forbid unused lines to be mapped as IRQs */ + for (offset = 0; offset < chip->ngpio; offset++) { + u32 port, bit; + + port = offset / 8; + bit = offset % 8; + + if (port >= ARRAY_SIZE(rzg2l_gpio_configs) || + bit >= RZG2L_GPIO_PORT_GET_PINCNT(rzg2l_gpio_configs[port])) + clear_bit(offset, valid_mask); + } +} + 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"); @@ -1140,6 +1366,15 @@ static int rzg2l_gpio_register(struct rzg2l_pinctrl *pctrl) chip->base = -1; chip->ngpio = of_args.args[2]; + girq = &chip->irq; + gpio_irq_chip_set_chip(girq, &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->init_valid_mask = rzg2l_init_irq_valid_mask; + pctrl->gpio_range.id = 0; pctrl->gpio_range.pin_base = 0; pctrl->gpio_range.base = 0; @@ -1255,6 +1490,7 @@ 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);