linux-kernel - [PATCH v3 01/17] gpio: altera: Convert to immutable irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230215-immutable-chips-v3-1-972542092a77@linaro.org>
Date:   Thu, 09 Mar 2023 08:45:49 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Mun Yew Tham <mun.yew.tham@...el.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, Alban Bedel <albeu@...e.fr>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Jay Fang <f.fangjian@...wei.com>,
        Daniel Palmer <daniel@...ngy.jp>,
        Romain Perier <romain.perier@...il.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        William Breathitt Gray <william.gray@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-omap@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>
Subject: [PATCH v3 01/17] gpio: altera: Convert to immutable irq_chip

Convert the driver to immutable irq-chip with a bit of
intuition.

Cc: Marc Zyngier <maz@...nel.org>
Acked-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/gpio/gpio-altera.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c
index b59fae993626..c1599edb3453 100644
--- a/drivers/gpio/gpio-altera.c
+++ b/drivers/gpio/gpio-altera.c
@@ -24,14 +24,12 @@
 * @interrupt_trigger	: specifies the hardware configured IRQ trigger type
 *			  (rising, falling, both, high)
 * @mapped_irq		: kernel mapped irq number.
-* @irq_chip		: IRQ chip configuration
 */
 struct altera_gpio_chip {
 	struct of_mm_gpio_chip mmchip;
 	raw_spinlock_t gpio_lock;
 	int interrupt_trigger;
 	int mapped_irq;
-	struct irq_chip irq_chip;
 };
 
 static void altera_gpio_irq_unmask(struct irq_data *d)
@@ -43,6 +41,7 @@ static void altera_gpio_irq_unmask(struct irq_data *d)
 
 	altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
 	mm_gc = &altera_gc->mmchip;
+	gpiochip_enable_irq(&mm_gc->gc, irqd_to_hwirq(d));
 
 	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 	intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
@@ -68,6 +67,7 @@ static void altera_gpio_irq_mask(struct irq_data *d)
 	intmask &= ~BIT(irqd_to_hwirq(d));
 	writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
+	gpiochip_disable_irq(&mm_gc->gc, irqd_to_hwirq(d));
 }
 
 /*
@@ -233,6 +233,17 @@ static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
+static const struct irq_chip altera_gpio_irq_chip = {
+	.name = "altera-gpio",
+	.irq_mask = altera_gpio_irq_mask,
+	.irq_unmask = altera_gpio_irq_unmask,
+	.irq_set_type = altera_gpio_irq_set_type,
+	.irq_startup  = altera_gpio_irq_startup,
+	.irq_shutdown = altera_gpio_irq_mask,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int altera_gpio_probe(struct platform_device *pdev)
 {
 	struct device_node *node = pdev->dev.of_node;
@@ -278,15 +289,9 @@ static int altera_gpio_probe(struct platform_device *pdev)
 	}
 	altera_gc->interrupt_trigger = reg;
 
-	altera_gc->irq_chip.name = "altera-gpio";
-	altera_gc->irq_chip.irq_mask     = altera_gpio_irq_mask;
-	altera_gc->irq_chip.irq_unmask   = altera_gpio_irq_unmask;
-	altera_gc->irq_chip.irq_set_type = altera_gpio_irq_set_type;
-	altera_gc->irq_chip.irq_startup  = altera_gpio_irq_startup;
-	altera_gc->irq_chip.irq_shutdown = altera_gpio_irq_mask;
-
 	girq = &altera_gc->mmchip.gc.irq;
-	girq->chip = &altera_gc->irq_chip;
+	gpio_irq_chip_set_chip(girq, &altera_gpio_irq_chip);
+
 	if (altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH)
 		girq->parent_handler = altera_gpio_irq_leveL_high_handler;
 	else

-- 
2.34.1