linux-kernel - [PATCH v2 04/16] gpio: aspeed-sgpio: 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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20230215-immutable-chips-v2-4-d6b0e3f2d991@linaro.org>
Date:   Tue, 07 Mar 2023 14:04:46 +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 v2 04/16] gpio: aspeed-sgpio: 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-aspeed-sgpio.c | 44 ++++++++++++++++++++++++++++++++--------
 1 file changed, 36 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c
index 454cefbeecf0..3c1c0fc21fc5 100644
--- a/drivers/gpio/gpio-aspeed-sgpio.c
+++ b/drivers/gpio/gpio-aspeed-sgpio.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/seq_file.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 
@@ -29,7 +30,7 @@ struct aspeed_sgpio_pdata {
 
 struct aspeed_sgpio {
 	struct gpio_chip chip;
-	struct irq_chip intc;
+	struct device *dev;
 	struct clk *pclk;
 	raw_spinlock_t lock;
 	void __iomem *base;
@@ -296,6 +297,10 @@ static void aspeed_sgpio_irq_set_mask(struct irq_data *d, bool set)
 	irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
 	addr = bank_reg(gpio, bank, reg_irq_enable);
 
+	/* Unmasking the IRQ */
+	if (set)
+		gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(d));
+
 	raw_spin_lock_irqsave(&gpio->lock, flags);
 
 	reg = ioread32(addr);
@@ -307,6 +312,12 @@ static void aspeed_sgpio_irq_set_mask(struct irq_data *d, bool set)
 	iowrite32(reg, addr);
 
 	raw_spin_unlock_irqrestore(&gpio->lock, flags);
+
+	/* Masking the IRQ */
+	if (!set)
+		gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(d));
+
+
 }
 
 static void aspeed_sgpio_irq_mask(struct irq_data *d)
@@ -401,6 +412,27 @@ static void aspeed_sgpio_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(ic, desc);
 }
 
+static void aspeed_sgpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
+{
+	const struct aspeed_sgpio_bank *bank;
+	struct aspeed_sgpio *gpio;
+	u32 bit;
+	int offset;
+
+	irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
+	seq_printf(p, dev_name(gpio->dev));
+}
+
+static const struct irq_chip aspeed_sgpio_irq_chip = {
+	.irq_ack = aspeed_sgpio_irq_ack,
+	.irq_mask = aspeed_sgpio_irq_mask,
+	.irq_unmask = aspeed_sgpio_irq_unmask,
+	.irq_set_type = aspeed_sgpio_set_type,
+	.irq_print_chip = aspeed_sgpio_irq_print_chip,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
 				   struct platform_device *pdev)
 {
@@ -423,14 +455,8 @@ static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
 		iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_status));
 	}
 
-	gpio->intc.name = dev_name(&pdev->dev);
-	gpio->intc.irq_ack = aspeed_sgpio_irq_ack;
-	gpio->intc.irq_mask = aspeed_sgpio_irq_mask;
-	gpio->intc.irq_unmask = aspeed_sgpio_irq_unmask;
-	gpio->intc.irq_set_type = aspeed_sgpio_set_type;
-
 	irq = &gpio->chip.irq;
-	irq->chip = &gpio->intc;
+	gpio_irq_chip_set_chip(irq, &aspeed_sgpio_irq_chip);
 	irq->init_valid_mask = aspeed_sgpio_irq_init_valid_mask;
 	irq->handler = handle_bad_irq;
 	irq->default_type = IRQ_TYPE_NONE;
@@ -524,6 +550,8 @@ static int __init aspeed_sgpio_probe(struct platform_device *pdev)
 	if (IS_ERR(gpio->base))
 		return PTR_ERR(gpio->base);
 
+	gpio->dev = &pdev->dev;
+
 	pdata = device_get_match_data(&pdev->dev);
 	if (!pdata)
 		return -EINVAL;

-- 
2.34.1