Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753244AbbEFIjT (ORCPT ); Wed, 6 May 2015 04:39:19 -0400 Received: from mail-pa0-f49.google.com ([209.85.220.49]:36139 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753180AbbEFIjM (ORCPT ); Wed, 6 May 2015 04:39:12 -0400 From: Gregory Fong To: linux-gpio@vger.kernel.org Cc: Gregory Fong , Alexandre Courbot , bcm-kernel-feedback-list@broadcom.com, Brian Norris , devicetree@vger.kernel.org, Florian Fainelli , Ian Campbell , Kumar Gala , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , Pawel Moll , Rob Herring , Russell King Subject: [PATCH 3/3] gpio: brcmstb: Add interrupt support Date: Wed, 6 May 2015 01:37:57 -0700 Message-Id: <1430901477-10678-4-git-send-email-gregory.0xf0@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1430901477-10678-1-git-send-email-gregory.0xf0@gmail.com> References: <1430901477-10678-1-git-send-email-gregory.0xf0@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9840 Lines: 326 Create an irq_chip for each GIO block. Uses chained IRQ handling since known uses of this block have a BCM7120 L2 interrupt controller as a parent. Supports interrupts for all GPIOs. Signed-off-by: Gregory Fong --- drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-brcmstb.c | 249 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 250 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 5f79b7f..2f9b913 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -131,6 +131,7 @@ config GPIO_BRCMSTB default y if ARCH_BRCMSTB depends on OF_GPIO && (ARCH_BRCMSTB || COMPILE_TEST) select GPIO_GENERIC + select IRQ_DOMAIN help Say yes here to enable GPIO support for Broadcom STB (BCM7XXX) SoCs. diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c index c8f9014..6195838 100644 --- a/drivers/gpio/gpio-brcmstb.c +++ b/drivers/gpio/gpio-brcmstb.c @@ -17,6 +17,8 @@ #include #include #include +#include +#include #define GIO_BANK_SIZE 0x20 #define GIO_ODEN(bank) (((bank) * GIO_BANK_SIZE) + 0x00) @@ -40,7 +42,11 @@ struct brcmstb_gpio_priv { struct list_head bank_list; void __iomem *reg_base; int num_banks; + int num_gpios; struct platform_device *pdev; + struct irq_chip irq_chip; + struct irq_domain *irq_domain; + int parent_irq; int gpio_base; }; @@ -59,6 +65,226 @@ brcmstb_gpio_gc_to_priv(struct gpio_chip *gc) return bank->parent_priv; } +static void brcmstb_gpio_set_imask(struct brcmstb_gpio_bank *bank, + unsigned int offset, bool enable) +{ + struct bgpio_chip *bgc = &bank->bgc; + struct brcmstb_gpio_priv *priv = bank->parent_priv; + unsigned long mask = bgc->pin2mask(bgc, offset); + unsigned long flags; + + spin_lock_irqsave(&bgc->lock, flags); + + if (enable) + bank->imask |= mask; + else + bank->imask &= ~mask; + bgc->write_reg(priv->reg_base + GIO_MASK(bank->id), bank->imask); + + spin_unlock_irqrestore(&bgc->lock, flags); +} + +static int brcmstb_gpio_to_irq(struct gpio_chip *gc, unsigned gc_offset) +{ + struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc); + /* gc_offset is relative to this gpio_chip; want real offset */ + int offset = gc_offset + (gc->base - priv->gpio_base); + + if (offset >= priv->num_gpios) + return -ENXIO; + return irq_create_mapping(priv->irq_domain, offset); +} + +/* -------------------- IRQ chip functions -------------------- */ + +static int brcmstb_gpio_hwirq_to_offset(irq_hw_number_t hwirq, + struct brcmstb_gpio_bank *bank) +{ + return hwirq - (bank->bgc.gc.base - bank->parent_priv->gpio_base); +} + +static void brcmstb_gpio_irq_mask(struct irq_data *d) +{ + struct brcmstb_gpio_bank *bank = irq_data_get_irq_chip_data(d); + int offset = brcmstb_gpio_hwirq_to_offset(d->hwirq, bank); + + brcmstb_gpio_set_imask(bank, offset, false); +} + +static void brcmstb_gpio_irq_unmask(struct irq_data *d) +{ + struct brcmstb_gpio_bank *bank = irq_data_get_irq_chip_data(d); + int offset = brcmstb_gpio_hwirq_to_offset(d->hwirq, bank); + + brcmstb_gpio_set_imask(bank, offset, true); +} + +static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct brcmstb_gpio_bank *bank = irq_data_get_irq_chip_data(d); + struct brcmstb_gpio_priv *priv = bank->parent_priv; + u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank)); + u32 edge_insensitive, iedge_insensitive; + u32 edge_config, iedge_config; + u32 level, ilevel; + unsigned long flags; + + switch (type) { + case IRQ_TYPE_LEVEL_LOW: + level = 0; + edge_config = 0; + edge_insensitive = 0; + break; + case IRQ_TYPE_LEVEL_HIGH: + level = mask; + edge_config = 0; + edge_insensitive = 0; + break; + case IRQ_TYPE_EDGE_FALLING: + level = 0; + edge_config = 0; + edge_insensitive = 0; + break; + case IRQ_TYPE_EDGE_RISING: + level = 0; + edge_config = mask; + edge_insensitive = 0; + break; + case IRQ_TYPE_EDGE_BOTH: + level = 0; + edge_config = 0; /* don't care, but want known value */ + edge_insensitive = mask; + break; + default: + return -EINVAL; + } + + spin_lock_irqsave(&bank->bgc.lock, flags); + + iedge_config = bank->bgc.read_reg(priv->reg_base + + GIO_EC(bank->id)) & ~mask; + iedge_insensitive = bank->bgc.read_reg(priv->reg_base + + GIO_EI(bank->id)) & ~mask; + ilevel = bank->bgc.read_reg(priv->reg_base + + GIO_LEVEL(bank->id)) & ~mask; + + bank->bgc.write_reg(priv->reg_base + GIO_EC(bank->id), + iedge_config | edge_config); + bank->bgc.write_reg(priv->reg_base + GIO_EI(bank->id), + iedge_insensitive | edge_insensitive); + bank->bgc.write_reg(priv->reg_base + GIO_LEVEL(bank->id), + ilevel | level); + + spin_unlock_irqrestore(&bank->bgc.lock, flags); + return 0; +} + +static void brcmstb_gpio_irq_bank_handler(int irq, + struct brcmstb_gpio_bank *bank) +{ + void __iomem *reg_base = bank->parent_priv->reg_base; + unsigned long status; + unsigned long flags; + + spin_lock_irqsave(&bank->bgc.lock, flags); + while ((status = bank->bgc.read_reg(reg_base + GIO_STAT(bank->id)) & + bank->imask)) { + int bit; + for_each_set_bit(bit, &status, 32) { + int hwirq = bank->bgc.gc.base - + bank->parent_priv->gpio_base + bit; + int child_irq = + irq_find_mapping(bank->parent_priv->irq_domain, + hwirq); + u32 stat = bank->bgc.read_reg(reg_base + + GIO_STAT(bank->id)); + bank->bgc.write_reg(reg_base + GIO_STAT(bank->id), + stat | BIT(bit)); + generic_handle_irq(child_irq); + } + } + spin_unlock_irqrestore(&bank->bgc.lock, flags); +} + +/* Each UPG GIO block has one IRQ for all banks */ +static void brcmstb_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct brcmstb_gpio_priv *priv = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + struct list_head *pos; + + chained_irq_enter(chip, desc); + list_for_each(pos, &priv->bank_list) { + struct brcmstb_gpio_bank *bank = + list_entry(pos, struct brcmstb_gpio_bank, node); + brcmstb_gpio_irq_bank_handler(irq, bank); + } + chained_irq_exit(chip, desc); +} + +static struct brcmstb_gpio_bank *brcmstb_gpio_hwirq_to_bank( + struct brcmstb_gpio_priv *priv, irq_hw_number_t hwirq) +{ + struct list_head *pos; + int i = 0; + + /* banks are in descending order */ + list_for_each_prev(pos, &priv->bank_list) { + struct brcmstb_gpio_bank *bank = + list_entry(pos, struct brcmstb_gpio_bank, node); + i += bank->bgc.gc.ngpio; + if (hwirq < i) + return bank; + } + return NULL; +} + +/* + * This lock class tells lockdep that GPIO irqs are in a different + * category than their parents, so it won't report false recursion. + */ +static struct lock_class_key brcmstb_gpio_irq_lock_class; + + +static int brcmstb_gpio_irq_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct brcmstb_gpio_priv *priv = d->host_data; + struct brcmstb_gpio_bank *bank = + brcmstb_gpio_hwirq_to_bank(priv, hwirq); + struct platform_device *pdev = priv->pdev; + int ret; + + if (!bank) + return -EINVAL; + + dev_dbg(&pdev->dev, "Mapping irq %d for gpio line %d (bank %d)\n", + irq, (int)hwirq, bank->id); + ret = irq_set_chip_data(irq, bank); + if (ret < 0) + return ret; + irq_set_lockdep_class(irq, &brcmstb_gpio_irq_lock_class); + irq_set_chip_and_handler(irq, &priv->irq_chip, handle_simple_irq); +#ifdef CONFIG_ARM + set_irq_flags(irq, IRQF_VALID); +#else + irq_set_noprobe(irq); +#endif + return 0; +} + +static void brcmstb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) +{ + irq_set_chip_and_handler(irq, NULL, NULL); + irq_set_chip_data(irq, NULL); +} + +static struct irq_domain_ops brcmstb_gpio_irq_domain_ops = { + .map = brcmstb_gpio_irq_map, + .unmap = brcmstb_gpio_irq_unmap, + .xlate = irq_domain_xlate_twocell, +}; + /* Make sure that the number of banks matches up between properties */ static int brcmstb_gpio_sanity_check_banks(struct device *dev, struct device_node *np, struct resource *res) @@ -140,6 +366,11 @@ static int brcmstb_gpio_probe(struct platform_device *pdev) priv->gpio_base = gpio_base; priv->reg_base = reg_base; priv->pdev = pdev; + priv->parent_irq = platform_get_irq(pdev, 0); + if (priv->parent_irq < 0) { + dev_err(dev, "Couldn't get IRQ"); + return -ENOENT; + } INIT_LIST_HEAD(&priv->bank_list); if (brcmstb_gpio_sanity_check_banks(dev, np, res)) @@ -181,6 +412,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev) gc->base = gpio_base; gc->of_gpio_n_cells = 2; gc->of_xlate = brcmstb_gpio_of_xlate; + gc->to_irq = brcmstb_gpio_to_irq; if (bank_width <= 0 || bank_width > GPIO_PER_BANK) { gc->ngpio = GPIO_PER_BANK; @@ -209,6 +441,23 @@ static int brcmstb_gpio_probe(struct platform_device *pdev) priv->num_banks++; } + priv->num_gpios = gpio_base - priv->gpio_base; + priv->irq_chip.name = dev_name(dev); + priv->irq_chip.irq_mask = brcmstb_gpio_irq_mask; + priv->irq_chip.irq_unmask = brcmstb_gpio_irq_unmask; + priv->irq_chip.irq_set_type = brcmstb_gpio_irq_set_type; + priv->irq_domain = + irq_domain_add_linear(np, priv->num_gpios, + &brcmstb_gpio_irq_domain_ops, + priv); + if (!priv->irq_domain) { + dev_err(dev, "Couldn't allocate IRQ domain\n"); + err = -ENXIO; + goto fail; + } + irq_set_chained_handler(priv->parent_irq, brcmstb_gpio_irq_handler); + irq_set_handler_data(priv->parent_irq, priv); + dev_info(dev, "Registered %d banks (GPIO(s): %d-%d)\n", priv->num_banks, priv->gpio_base, gpio_base - 1); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/