1 files changed, 132 insertions, 5 deletions

diff --git a/drivers/gpio/gpio-realtek-otto.c b/drivers/gpio/gpio-realtek-otto.c
index bd75401b549d..c52b2cb1acae 100644
--- a/drivers/gpio/gpio-realtek-otto.c
+++ b/drivers/gpio/gpio-realtek-otto.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
 #include <linux/gpio/driver.h>
+#include <linux/cpumask.h>
 #include <linux/irq.h>
 #include <linux/minmax.h>
 #include <linux/mod_devicetable.h>
@@ -55,9 +56,13 @@
 struct realtek_gpio_ctrl {
 	struct gpio_chip gc;
 	void __iomem *base;
+	void __iomem *cpumask_base;
+	struct cpumask cpu_irq_maskable;
 	raw_spinlock_t lock;
 	u16 intr_mask[REALTEK_GPIO_PORTS_PER_BANK];
 	u16 intr_type[REALTEK_GPIO_PORTS_PER_BANK];
+	unsigned int (*port_offset_u8)(unsigned int port);
+	unsigned int (*port_offset_u16)(unsigned int port);
 };
 
 /* Expand with more flags as devices with other quirks are added */
@@ -69,6 +74,16 @@ enum realtek_gpio_flags {
 	 * line the IRQ handler was assigned to, causing uncaught interrupts.
 	 */
 	GPIO_INTERRUPTS_DISABLED = BIT(0),
+	/*
+	 * Port order is reversed, meaning DCBA register layout for 1-bit
+	 * fields, and [BA, DC] for 2-bit fields.
+	 */
+	GPIO_PORTS_REVERSED = BIT(1),
+	/*
+	 * Interrupts can be enabled per cpu. This requires a secondary IO
+	 * range, where the per-cpu enable masks are located.
+	 */
+	GPIO_INTERRUPTS_PER_CPU = BIT(2),
 };
 
 static struct realtek_gpio_ctrl *irq_data_to_ctrl(struct irq_data *data)
@@ -86,21 +101,50 @@ static struct realtek_gpio_ctrl *irq_data_to_ctrl(struct irq_data *data)
  * port. The two interrupt mask registers store two bits per GPIO, so use u16
  * values.
  */
+static unsigned int realtek_gpio_port_offset_u8(unsigned int port)
+{
+	return port;
+}
+
+static unsigned int realtek_gpio_port_offset_u16(unsigned int port)
+{
+	return 2 * port;
+}
+
+/*
+ * Reversed port order register access
+ *
+ * For registers with one bit per GPIO, all ports are stored as u8-s in one
+ * register in reversed order. The two interrupt mask registers store two bits
+ * per GPIO, so use u16 values. The first register contains ports 1 and 0, the
+ * second ports 3 and 2.
+ */
+static unsigned int realtek_gpio_port_offset_u8_rev(unsigned int port)
+{
+	return 3 - port;
+}
+
+static unsigned int realtek_gpio_port_offset_u16_rev(unsigned int port)
+{
+	return 2 * (port ^ 1);
+}
+
 static void realtek_gpio_write_imr(struct realtek_gpio_ctrl *ctrl,
 	unsigned int port, u16 irq_type, u16 irq_mask)
 {
-	iowrite16(irq_type & irq_mask, ctrl->base + REALTEK_GPIO_REG_IMR + 2 * port);
+	iowrite16(irq_type & irq_mask,
+		ctrl->base + REALTEK_GPIO_REG_IMR + ctrl->port_offset_u16(port));
 }
 
 static void realtek_gpio_clear_isr(struct realtek_gpio_ctrl *ctrl,
 	unsigned int port, u8 mask)
 {
-	iowrite8(mask, ctrl->base + REALTEK_GPIO_REG_ISR + port);
+	iowrite8(mask, ctrl->base + REALTEK_GPIO_REG_ISR + ctrl->port_offset_u8(port));
 }
 
 static u8 realtek_gpio_read_isr(struct realtek_gpio_ctrl *ctrl, unsigned int port)
 {
-	return ioread8(ctrl->base + REALTEK_GPIO_REG_ISR + port);
+	return ioread8(ctrl->base + REALTEK_GPIO_REG_ISR + ctrl->port_offset_u8(port));
 }
 
 /* Set the rising and falling edge mask bits for a GPIO port pin */
@@ -211,14 +255,61 @@ static void realtek_gpio_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(irq_chip, desc);
 }
 
+static inline void __iomem *realtek_gpio_irq_cpu_mask(struct realtek_gpio_ctrl *ctrl,
+	unsigned int port, int cpu)
+{
+	return ctrl->cpumask_base + ctrl->port_offset_u8(port) +
+		REALTEK_GPIO_PORTS_PER_BANK * cpu;
+}
+
+static int realtek_gpio_irq_set_affinity(struct irq_data *data,
+	const struct cpumask *dest, bool force)
+{
+	struct realtek_gpio_ctrl *ctrl = irq_data_to_ctrl(data);
+	unsigned int line = irqd_to_hwirq(data);
+	unsigned int port = line / 8;
+	unsigned int port_pin = line % 8;
+	void __iomem *irq_cpu_mask;
+	unsigned long flags;
+	int cpu;
+	u8 v;
+
+	if (!ctrl->cpumask_base)
+		return -ENXIO;
+
+	raw_spin_lock_irqsave(&ctrl->lock, flags);
+
+	for_each_cpu(cpu, &ctrl->cpu_irq_maskable) {
+		irq_cpu_mask = realtek_gpio_irq_cpu_mask(ctrl, port, cpu);
+		v = ioread8(irq_cpu_mask);
+
+		if (cpumask_test_cpu(cpu, dest))
+			v |= BIT(port_pin);
+		else
+			v &= ~BIT(port_pin);
+
+		iowrite8(v, irq_cpu_mask);
+	}
+
+	raw_spin_unlock_irqrestore(&ctrl->lock, flags);
+
+	irq_data_update_effective_affinity(data, dest);
+
+	return 0;
+}
+
 static int realtek_gpio_irq_init(struct gpio_chip *gc)
 {
 	struct realtek_gpio_ctrl *ctrl = gpiochip_get_data(gc);
 	unsigned int port;
+	int cpu;
 
 	for (port = 0; (port * 8) < gc->ngpio; port++) {
 		realtek_gpio_write_imr(ctrl, port, 0, 0);
 		realtek_gpio_clear_isr(ctrl, port, GENMASK(7, 0));
+
+		for_each_cpu(cpu, &ctrl->cpu_irq_maskable)
+			iowrite8(GENMASK(7, 0), realtek_gpio_irq_cpu_mask(ctrl, port, cpu));
 	}
 
 	return 0;
@@ -230,6 +321,7 @@ static struct irq_chip realtek_gpio_irq_chip = {
 	.irq_mask = realtek_gpio_irq_mask,
 	.irq_unmask = realtek_gpio_irq_unmask,
 	.irq_set_type = realtek_gpio_irq_set_type,
+	.irq_set_affinity = realtek_gpio_irq_set_affinity,
 };
 
 static const struct of_device_id realtek_gpio_of_match[] = {
@@ -243,6 +335,13 @@ static const struct of_device_id realtek_gpio_of_match[] = {
 	{
 		.compatible = "realtek,rtl8390-gpio",
 	},
+	{
+		.compatible = "realtek,rtl9300-gpio",
+		.data = (void *)(GPIO_PORTS_REVERSED | GPIO_INTERRUPTS_PER_CPU)
+	},
+	{
+		.compatible = "realtek,rtl9310-gpio",
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, realtek_gpio_of_match);
@@ -250,11 +349,14 @@ MODULE_DEVICE_TABLE(of, realtek_gpio_of_match);
 static int realtek_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	unsigned long bgpio_flags;
 	unsigned int dev_flags;
 	struct gpio_irq_chip *girq;
 	struct realtek_gpio_ctrl *ctrl;
+	struct resource *res;
 	u32 ngpios;
-	int err, irq;
+	unsigned int nr_cpus;
+	int cpu, err, irq;
 
 	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl)
@@ -277,10 +379,20 @@ static int realtek_gpio_probe(struct platform_device *pdev)
 
 	raw_spin_lock_init(&ctrl->lock);
 
+	if (dev_flags & GPIO_PORTS_REVERSED) {
+		bgpio_flags = 0;
+		ctrl->port_offset_u8 = realtek_gpio_port_offset_u8_rev;
+		ctrl->port_offset_u16 = realtek_gpio_port_offset_u16_rev;
+	} else {
+		bgpio_flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+		ctrl->port_offset_u8 = realtek_gpio_port_offset_u8;
+		ctrl->port_offset_u16 = realtek_gpio_port_offset_u16;
+	}
+
 	err = bgpio_init(&ctrl->gc, dev, 4,
 		ctrl->base + REALTEK_GPIO_REG_DATA, NULL, NULL,
 		ctrl->base + REALTEK_GPIO_REG_DIR, NULL,
-		BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+		bgpio_flags);
 	if (err) {
 		dev_err(dev, "unable to init generic GPIO");
 		return err;
@@ -305,6 +417,21 @@ static int realtek_gpio_probe(struct platform_device *pdev)
 		girq->init_hw = realtek_gpio_irq_init;
 	}
 
+	cpumask_clear(&ctrl->cpu_irq_maskable);
+
+	if ((dev_flags & GPIO_INTERRUPTS_PER_CPU) && irq > 0) {
+		ctrl->cpumask_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
+		if (IS_ERR(ctrl->cpumask_base))
+			return dev_err_probe(dev, PTR_ERR(ctrl->cpumask_base),
+				"missing CPU IRQ mask registers");
+
+		nr_cpus = resource_size(res) / REALTEK_GPIO_PORTS_PER_BANK;
+		nr_cpus = min(nr_cpus, num_present_cpus());
+
+		for (cpu = 0; cpu < nr_cpus; cpu++)
+			cpumask_set_cpu(cpu, &ctrl->cpu_irq_maskable);
+	}
+
 	return devm_gpiochip_add_data(dev, &ctrl->gc, ctrl);
 }