MIPS: Octeon: Add irq handlers for GPIO interrupts.

This is needed for follow-on on patches for Octeon to use the Device
Tree to configure GPIO interrupts.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc:  linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3932/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/cavium-octeon/octeon-irq.c

@@ -505,6 +505,85 @@ static void octeon_irq_ciu_enable_all_v2(struct irq_data *data)
 	}
 }
 
+static void octeon_irq_gpio_setup(struct irq_data *data)
+{
+	union cvmx_gpio_bit_cfgx cfg;
+	union octeon_ciu_chip_data cd;
+	u32 t = irqd_get_trigger_type(data);
+
+	cd.p = irq_data_get_irq_chip_data(data);
+
+	cfg.u64 = 0;
+	cfg.s.int_en = 1;
+	cfg.s.int_type = (t & IRQ_TYPE_EDGE_BOTH) != 0;
+	cfg.s.rx_xor = (t & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) != 0;
+
+	/* 140 nS glitch filter*/
+	cfg.s.fil_cnt = 7;
+	cfg.s.fil_sel = 3;
+
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), cfg.u64);
+}
+
+static void octeon_irq_ciu_enable_gpio_v2(struct irq_data *data)
+{
+	octeon_irq_gpio_setup(data);
+	octeon_irq_ciu_enable_v2(data);
+}
+
+static void octeon_irq_ciu_enable_gpio(struct irq_data *data)
+{
+	octeon_irq_gpio_setup(data);
+	octeon_irq_ciu_enable(data);
+}
+
+static int octeon_irq_ciu_gpio_set_type(struct irq_data *data, unsigned int t)
+{
+	irqd_set_trigger_type(data, t);
+	octeon_irq_gpio_setup(data);
+
+	return IRQ_SET_MASK_OK;
+}
+
+static void octeon_irq_ciu_disable_gpio_v2(struct irq_data *data)
+{
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), 0);
+
+	octeon_irq_ciu_disable_all_v2(data);
+}
+
+static void octeon_irq_ciu_disable_gpio(struct irq_data *data)
+{
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), 0);
+
+	octeon_irq_ciu_disable_all(data);
+}
+
+static void octeon_irq_ciu_gpio_ack(struct irq_data *data)
+{
+	union octeon_ciu_chip_data cd;
+	u64 mask;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit - 16);
+
+	cvmx_write_csr(CVMX_GPIO_INT_CLR, mask);
+}
+
+static void octeon_irq_handle_gpio(unsigned int irq, struct irq_desc *desc)
+{
+	if (irqd_get_trigger_type(irq_desc_get_irq_data(desc)) & IRQ_TYPE_EDGE_BOTH)
+		handle_edge_irq(irq, desc);
+	else
+		handle_level_irq(irq, desc);
+}
+
 #ifdef CONFIG_SMP
 
 static void octeon_irq_cpu_offline_ciu(struct irq_data *data)
@@ -717,6 +796,33 @@ static struct irq_chip octeon_irq_chip_ciu_mbox = {
 	.flags = IRQCHIP_ONOFFLINE_ENABLED,
 };
 
+static struct irq_chip octeon_irq_chip_ciu_gpio_v2 = {
+	.name = "CIU-GPIO",
+	.irq_enable = octeon_irq_ciu_enable_gpio_v2,
+	.irq_disable = octeon_irq_ciu_disable_gpio_v2,
+	.irq_ack = octeon_irq_ciu_gpio_ack,
+	.irq_mask = octeon_irq_ciu_disable_local_v2,
+	.irq_unmask = octeon_irq_ciu_enable_v2,
+	.irq_set_type = octeon_irq_ciu_gpio_set_type,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = octeon_irq_ciu_set_affinity_v2,
+#endif
+	.flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
+static struct irq_chip octeon_irq_chip_ciu_gpio = {
+	.name = "CIU-GPIO",
+	.irq_enable = octeon_irq_ciu_enable_gpio,
+	.irq_disable = octeon_irq_ciu_disable_gpio,
+	.irq_mask = octeon_irq_dummy_mask,
+	.irq_ack = octeon_irq_ciu_gpio_ack,
+	.irq_set_type = octeon_irq_ciu_gpio_set_type,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = octeon_irq_ciu_set_affinity,
+#endif
+	.flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
 /*
  * Watchdog interrupts are special.  They are associated with a single
  * core, so we hardwire the affinity to that core.
@@ -890,6 +996,7 @@ static void __init octeon_irq_init_ciu(void)
 	struct irq_chip *chip_edge;
 	struct irq_chip *chip_mbox;
 	struct irq_chip *chip_wd;
+	struct irq_chip *chip_gpio;
 
 	octeon_irq_init_ciu_percpu();
 	octeon_irq_setup_secondary = octeon_irq_setup_secondary_ciu;
@@ -904,13 +1011,15 @@ static void __init octeon_irq_init_ciu(void)
 		chip_edge = &octeon_irq_chip_ciu_edge_v2;
 		chip_mbox = &octeon_irq_chip_ciu_mbox_v2;
 		chip_wd = &octeon_irq_chip_ciu_wd_v2;
+		chip_gpio = &octeon_irq_chip_ciu_gpio_v2;
 	} else {
 		octeon_irq_ip2 = octeon_irq_ip2_v1;
 		octeon_irq_ip3 = octeon_irq_ip3_v1;
 		chip = &octeon_irq_chip_ciu;
 		chip_edge = &octeon_irq_chip_ciu_edge;
 		chip_mbox = &octeon_irq_chip_ciu_mbox;
 		chip_wd = &octeon_irq_chip_ciu_wd;
+		chip_gpio = &octeon_irq_chip_ciu_gpio;
 	}
 	octeon_irq_ip4 = octeon_irq_ip4_mask;
 
@@ -921,7 +1030,7 @@ static void __init octeon_irq_init_ciu(void)
 	for (i = 0; i < 16; i++)
 		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_WORKQ0, 0, i + 0, chip, handle_level_irq);
 	for (i = 0; i < 16; i++)
-		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_GPIO0, 0, i + 16, chip, handle_level_irq);
+		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_GPIO0, 0, i + 16, chip_gpio, octeon_irq_handle_gpio);
 
 	octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX0, 0, 32, chip_mbox, handle_percpu_irq);
 	octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX1, 0, 33, chip_mbox, handle_percpu_irq);