linux-kernel - [PATCH v2 2/4] irqchip/meson-gpio: support more than 8 channels gpio irq line

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Date:   Wed, 19 Jan 2022 15:08:07 +0800
From:   Qianggui Song <qianggui.song@...ogic.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
CC:     Qianggui Song <qianggui.song@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>
Subject: [PATCH v2 2/4] irqchip/meson-gpio: support more than 8 channels gpio irq line

Current meson gpio irqchip driver only support 8 channels for gpio irq
line, later chips may have more then 8 channels, so need to modify code
to support more.

Signed-off-by: Qianggui Song <qianggui.song@...ogic.com>
---
 drivers/irqchip/irq-meson-gpio.c | 33 +++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-meson-gpio.c b/drivers/irqchip/irq-meson-gpio.c
index d90ff0b92480..eefe15e1b3a6 100644
--- a/drivers/irqchip/irq-meson-gpio.c
+++ b/drivers/irqchip/irq-meson-gpio.c
@@ -16,7 +16,6 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 
-#define NUM_CHANNEL 8
 #define MAX_INPUT_MUX 256
 
 #define REG_EDGE_POL	0x00
@@ -60,6 +59,7 @@ struct irq_ctl_ops {
 
 struct meson_gpio_irq_params {
 	unsigned int nr_hwirq;
+	unsigned int nr_channels;
 	bool support_edge_both;
 	unsigned int edge_both_offset;
 	unsigned int edge_single_offset;
@@ -81,6 +81,7 @@ struct meson_gpio_irq_params {
 	.edge_single_offset = 0,				\
 	.pol_low_offset = 16,					\
 	.pin_sel_mask = 0xff,					\
+	.nr_channels = 8,					\
 
 #define INIT_MESON_A1_COMMON_DATA(irqs)				\
 	INIT_MESON_COMMON(irqs, meson_a1_gpio_irq_init,		\
@@ -90,6 +91,7 @@ struct meson_gpio_irq_params {
 	.edge_single_offset = 8,				\
 	.pol_low_offset = 0,					\
 	.pin_sel_mask = 0x7f,					\
+	.nr_channels = 8,					\
 
 static const struct meson_gpio_irq_params meson8_params = {
 	INIT_MESON8_COMMON_DATA(134)
@@ -136,8 +138,8 @@ static const struct of_device_id meson_irq_gpio_matches[] = {
 struct meson_gpio_irq_controller {
 	const struct meson_gpio_irq_params *params;
 	void __iomem *base;
-	u32 channel_irqs[NUM_CHANNEL];
-	DECLARE_BITMAP(channel_map, NUM_CHANNEL);
+	u32 *channel_irqs;
+	unsigned long *channel_map;
 	spinlock_t lock;
 };
 
@@ -207,8 +209,8 @@ meson_gpio_irq_request_channel(struct meson_gpio_irq_controller *ctl,
 	spin_lock_irqsave(&ctl->lock, flags);
 
 	/* Find a free channel */
-	idx = find_first_zero_bit(ctl->channel_map, NUM_CHANNEL);
-	if (idx >= NUM_CHANNEL) {
+	idx = find_first_zero_bit(ctl->channel_map, ctl->params->nr_channels);
+	if (idx >= ctl->params->nr_channels) {
 		spin_unlock_irqrestore(&ctl->lock, flags);
 		pr_err("No channel available\n");
 		return -ENOSPC;
@@ -447,13 +449,26 @@ static int meson_gpio_irq_parse_dt(struct device_node *node, struct meson_gpio_i
 
 	ctl->params = match->data;
 
+	ctl->channel_irqs = kcalloc(ctl->params->nr_channels, sizeof(*ctl->channel_irqs),
+				    GFP_KERNEL);
+	if (!ctl->channel_irqs)
+		return -ENOMEM;
+
+	ctl->channel_map = bitmap_zalloc(ctl->params->nr_channels, GFP_KERNEL);
+	if (!ctl->channel_map) {
+		kfree(ctl->channel_irqs);
+		return -ENOMEM;
+	}
+
 	ret = of_property_read_variable_u32_array(node,
 						  "amlogic,channel-interrupts",
 						  ctl->channel_irqs,
-						  NUM_CHANNEL,
-						  NUM_CHANNEL);
+						  ctl->params->nr_channels,
+						  ctl->params->nr_channels);
 	if (ret < 0) {
-		pr_err("can't get %d channel interrupts\n", NUM_CHANNEL);
+		pr_err("can't get %d channel interrupts\n", ctl->params->nr_channels);
+		kfree(ctl->channel_map);
+		kfree(ctl->channel_irqs);
 		return ret;
 	}
 
@@ -507,7 +522,7 @@ static int meson_gpio_irq_of_init(struct device_node *node, struct device_node *
 	}
 
 	pr_info("%d to %d gpio interrupt mux initialized\n",
-		ctl->params->nr_hwirq, NUM_CHANNEL);
+		ctl->params->nr_hwirq, ctl->params->nr_channels);
 
 	return 0;
 
-- 
2.34.1