MIPS: OCTEON: Add support for cn68XX interrupt controller.

The cn68XX has a new interrupt controller named CIU2, add support for
this, and use it if cn68XX detected at runtime.

Signed-off-by: David Daney <david.daney@cavium.com>

2 files changed, 547 insertions, 24 deletions

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index 274cd4f..aba085b 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -16,6 +16,7 @@
 #include <linux/of.h>
 
 #include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-ciu2-defs.h>
 
 static DEFINE_RAW_SPINLOCK(octeon_irq_ciu0_lock);
 static DEFINE_RAW_SPINLOCK(octeon_irq_ciu1_lock);
@@ -29,8 +30,9 @@ union octeon_ciu_chip_data {
 	void *p;
 	unsigned long l;
 	struct {
-		unsigned int line:6;
-		unsigned int bit:6;
+		unsigned long line:6;
+		unsigned long bit:6;
+		unsigned long gpio_line:6;
 	} s;
 };
 
@@ -45,7 +47,7 @@ struct octeon_core_chip_data {
 
 static struct octeon_core_chip_data octeon_irq_core_chip_data[MIPS_CORE_IRQ_LINES];
 
-static void octeon_irq_set_ciu_mapping(int irq, int line, int bit,
+static void octeon_irq_set_ciu_mapping(int irq, int line, int bit, int gpio_line,
 				       struct irq_chip *chip,
 				       irq_flow_handler_t handler)
 {
@@ -56,6 +58,7 @@ static void octeon_irq_set_ciu_mapping(int irq, int line, int bit,
 	cd.l = 0;
 	cd.s.line = line;
 	cd.s.bit = bit;
+	cd.s.gpio_line = gpio_line;
 
 	irq_set_chip_data(irq, cd.p);
 	octeon_irq_ciu_to_irq[line][bit] = irq;
@@ -435,7 +438,7 @@ static void octeon_irq_ciu_ack(struct irq_data *data)
 	u64 mask;
 	union octeon_ciu_chip_data cd;
 
-	cd.p = data->chip_data;
+	cd.p = irq_data_get_irq_chip_data(data);
 	mask = 1ull << (cd.s.bit);
 
 	if (cd.s.line == 0) {
@@ -458,7 +461,7 @@ static void octeon_irq_ciu_disable_all_v2(struct irq_data *data)
 
 	wmb(); /* Make sure flag changes arrive before register updates. */
 
-	cd.p = data->chip_data;
+	cd.p = irq_data_get_irq_chip_data(data);
 	mask = 1ull << (cd.s.bit);
 
 	if (cd.s.line == 0) {
@@ -486,7 +489,7 @@ static void octeon_irq_ciu_enable_all_v2(struct irq_data *data)
 	u64 mask;
 	union octeon_ciu_chip_data cd;
 
-	cd.p = data->chip_data;
+	cd.p = irq_data_get_irq_chip_data(data);
 	mask = 1ull << (cd.s.bit);
 
 	if (cd.s.line == 0) {
@@ -521,7 +524,7 @@ static void octeon_irq_gpio_setup(struct irq_data *data)
 	cfg.s.fil_cnt = 7;
 	cfg.s.fil_sel = 3;
 
-	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.bit - 16), cfg.u64);
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.gpio_line), cfg.u64);
 }
 
 static void octeon_irq_ciu_enable_gpio_v2(struct irq_data *data)
@@ -549,7 +552,7 @@ 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);
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.gpio_line), 0);
 
 	octeon_irq_ciu_disable_all_v2(data);
 }
@@ -559,7 +562,7 @@ 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);
+	cvmx_write_csr(CVMX_GPIO_BIT_CFGX(cd.s.gpio_line), 0);
 
 	octeon_irq_ciu_disable_all(data);
 }
@@ -570,7 +573,7 @@ static void octeon_irq_ciu_gpio_ack(struct irq_data *data)
 	u64 mask;
 
 	cd.p = irq_data_get_irq_chip_data(data);
-	mask = 1ull << (cd.s.bit - 16);
+	mask = 1ull << (cd.s.gpio_line);
 
 	cvmx_write_csr(CVMX_GPIO_INT_CLR, mask);
 }
@@ -616,7 +619,7 @@ static int octeon_irq_ciu_set_affinity(struct irq_data *data,
 	unsigned long flags;
 	union octeon_ciu_chip_data cd;
 
-	cd.p = data->chip_data;
+	cd.p = irq_data_get_irq_chip_data(data);
 
 	/*
 	 * For non-v2 CIU, we will allow only single CPU affinity.
@@ -679,7 +682,7 @@ static int octeon_irq_ciu_set_affinity_v2(struct irq_data *data,
 	if (!enable_one)
 		return 0;
 
-	cd.p = data->chip_data;
+	cd.p = irq_data_get_irq_chip_data(data);
 	mask = 1ull << cd.s.bit;
 
 	if (cd.s.line == 0) {
@@ -976,19 +979,20 @@ static int octeon_irq_ciu_map(struct irq_domain *d,
 		return -EINVAL;
 
 	if (octeon_irq_ciu_is_edge(line, bit))
-		octeon_irq_set_ciu_mapping(virq, line, bit,
+		octeon_irq_set_ciu_mapping(virq, line, bit, 0,
 					   octeon_irq_ciu_chip,
 					   handle_edge_irq);
 	else
-		octeon_irq_set_ciu_mapping(virq, line, bit,
+		octeon_irq_set_ciu_mapping(virq, line, bit, 0,
 					   octeon_irq_ciu_chip,
 					   handle_level_irq);
 
 	return 0;
 }
 
-static int octeon_irq_gpio_map(struct irq_domain *d,
-			       unsigned int virq, irq_hw_number_t hw)
+static int octeon_irq_gpio_map_common(struct irq_domain *d,
+				      unsigned int virq, irq_hw_number_t hw,
+				      int line_limit, struct irq_chip *chip)
 {
 	struct octeon_irq_gpio_domain_data *gpiod = d->host_data;
 	unsigned int line, bit;
@@ -999,15 +1003,20 @@ static int octeon_irq_gpio_map(struct irq_domain *d,
 	hw += gpiod->base_hwirq;
 	line = hw >> 6;
 	bit = hw & 63;
-	if (line > 1 || octeon_irq_ciu_to_irq[line][bit] != 0)
+	if (line > line_limit || octeon_irq_ciu_to_irq[line][bit] != 0)
 		return -EINVAL;
 
-	octeon_irq_set_ciu_mapping(virq, line, bit,
-				   octeon_irq_gpio_chip,
-				   octeon_irq_handle_gpio);
+	octeon_irq_set_ciu_mapping(virq, line, bit, hw,
+				   chip, octeon_irq_handle_gpio);
 	return 0;
 }
 
+static int octeon_irq_gpio_map(struct irq_domain *d,
+			       unsigned int virq, irq_hw_number_t hw)
+{
+	return octeon_irq_gpio_map_common(d, virq, hw, 1, octeon_irq_gpio_chip);
+}
+
 static struct irq_domain_ops octeon_irq_domain_ciu_ops = {
 	.map = octeon_irq_ciu_map,
 	.xlate = octeon_irq_ciu_xlat,
@@ -1091,6 +1100,13 @@ static void octeon_irq_ip3_v2(void)
 	}
 }
 
+static bool octeon_irq_use_ip4;
+
+static void __cpuinit octeon_irq_local_enable_ip4(void *arg)
+{
+	set_c0_status(STATUSF_IP4);
+}
+
 static void octeon_irq_ip4_mask(void)
 {
 	clear_c0_status(STATUSF_IP4);
@@ -1103,6 +1119,13 @@ static void (*octeon_irq_ip4)(void);
 
 void __cpuinitdata (*octeon_irq_setup_secondary)(void);
 
+void __cpuinit octeon_irq_set_ip4_handler(octeon_irq_ip4_handler_t h)
+{
+	octeon_irq_ip4 = h;
+	octeon_irq_use_ip4 = true;
+	on_each_cpu(octeon_irq_local_enable_ip4, NULL, 1);
+}
+
 static void __cpuinit octeon_irq_percpu_enable(void)
 {
 	irq_cpu_online();
@@ -1123,6 +1146,28 @@ static void __cpuinit octeon_irq_init_ciu_percpu(void)
 	cvmx_read_csr(CVMX_CIU_INTX_SUM0((coreid * 2)));
 }
 
+static void octeon_irq_init_ciu2_percpu(void)
+{
+	u64 regx, ipx;
+	int coreid = cvmx_get_core_num();
+	u64 base = CVMX_CIU2_EN_PPX_IP2_WRKQ(coreid);
+
+	/*
+	 * Disable All CIU2 Interrupts. The ones we need will be
+	 * enabled later.  Read the SUM register so we know the write
+	 * completed.
+	 *
+	 * There are 9 registers and 3 IPX levels with strides 0x1000
+	 * and 0x200 respectivly.  Use loops to clear them.
+	 */
+	for (regx = 0; regx <= 0x8000; regx += 0x1000) {
+		for (ipx = 0; ipx <= 0x400; ipx += 0x200)
+			cvmx_write_csr(base + regx + ipx, 0);
+	}
+
+	cvmx_read_csr(CVMX_CIU2_SUM_PPX_IP2(coreid));
+}
+
 static void __cpuinit octeon_irq_setup_secondary_ciu(void)
 {
 
@@ -1137,6 +1182,19 @@ static void __cpuinit octeon_irq_setup_secondary_ciu(void)
 	clear_c0_status(STATUSF_IP4);
 }
 
+static void octeon_irq_setup_secondary_ciu2(void)
+{
+	octeon_irq_init_ciu2_percpu();
+	octeon_irq_percpu_enable();
+
+	/* Enable the CIU lines */
+	set_c0_status(STATUSF_IP3 | STATUSF_IP2);
+	if (octeon_irq_use_ip4)
+		set_c0_status(STATUSF_IP4);
+	else
+		clear_c0_status(STATUSF_IP4);
+}
+
 static void __init octeon_irq_init_ciu(void)
 {
 	unsigned int i;
@@ -1200,8 +1258,8 @@ static void __init octeon_irq_init_ciu(void)
 	for (i = 0; i < 16; i++)
 		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_WORKQ0, 0, i + 0);
 
-	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);
+	octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX0, 0, 32, 0, chip_mbox, handle_percpu_irq);
+	octeon_irq_set_ciu_mapping(OCTEON_IRQ_MBOX1, 0, 33, 0, chip_mbox, handle_percpu_irq);
 
 	for (i = 0; i < 4; i++)
 		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_PCI_INT0, 0, i + 36);
@@ -1217,7 +1275,7 @@ static void __init octeon_irq_init_ciu(void)
 
 	/* CIU_1 */
 	for (i = 0; i < 16; i++)
-		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_WDOG0, 1, i + 0, chip_wd, handle_level_irq);
+		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_WDOG0, 1, i + 0, 0, chip_wd, handle_level_irq);
 
 	octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_USB1, 1, 17);
 
@@ -1226,6 +1284,465 @@ static void __init octeon_irq_init_ciu(void)
 	clear_c0_status(STATUSF_IP4);
 }
 
+/*
+ * Watchdog interrupts are special.  They are associated with a single
+ * core, so we hardwire the affinity to that core.
+ */
+static void octeon_irq_ciu2_wd_enable(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = data->irq - OCTEON_IRQ_WDOG0;
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1S(coreid) + (0x1000ull * cd.s.line);
+	cvmx_write_csr(en_addr, mask);
+
+}
+
+static void octeon_irq_ciu2_enable(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int cpu = next_cpu_for_irq(data);
+	int coreid = octeon_coreid_for_cpu(cpu);
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1S(coreid) + (0x1000ull * cd.s.line);
+	cvmx_write_csr(en_addr, mask);
+}
+
+static void octeon_irq_ciu2_enable_local(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = cvmx_get_core_num();
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1S(coreid) + (0x1000ull * cd.s.line);
+	cvmx_write_csr(en_addr, mask);
+
+}
+
+static void octeon_irq_ciu2_disable_local(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = cvmx_get_core_num();
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1C(coreid) + (0x1000ull * cd.s.line);
+	cvmx_write_csr(en_addr, mask);
+
+}
+
+static void octeon_irq_ciu2_ack(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = cvmx_get_core_num();
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	en_addr = CVMX_CIU2_RAW_PPX_IP2_WRKQ(coreid) + (0x1000ull * cd.s.line);
+	cvmx_write_csr(en_addr, mask);
+
+}
+
+static void octeon_irq_ciu2_disable_all(struct irq_data *data)
+{
+	int cpu;
+	u64 mask;
+	union octeon_ciu_chip_data cd;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << (cd.s.bit);
+
+	for_each_online_cpu(cpu) {
+		u64 en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1C(octeon_coreid_for_cpu(cpu)) + (0x1000ull * cd.s.line);
+		cvmx_write_csr(en_addr, mask);
+	}
+}
+
+static void octeon_irq_ciu2_mbox_enable_all(struct irq_data *data)
+{
+	int cpu;
+	u64 mask;
+
+	mask = 1ull << (data->irq - OCTEON_IRQ_MBOX0);
+
+	for_each_online_cpu(cpu) {
+		u64 en_addr = CVMX_CIU2_EN_PPX_IP3_MBOX_W1S(octeon_coreid_for_cpu(cpu));
+		cvmx_write_csr(en_addr, mask);
+	}
+}
+
+static void octeon_irq_ciu2_mbox_disable_all(struct irq_data *data)
+{
+	int cpu;
+	u64 mask;
+
+	mask = 1ull << (data->irq - OCTEON_IRQ_MBOX0);
+
+	for_each_online_cpu(cpu) {
+		u64 en_addr = CVMX_CIU2_EN_PPX_IP3_MBOX_W1C(octeon_coreid_for_cpu(cpu));
+		cvmx_write_csr(en_addr, mask);
+	}
+}
+
+static void octeon_irq_ciu2_mbox_enable_local(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = cvmx_get_core_num();
+
+	mask = 1ull << (data->irq - OCTEON_IRQ_MBOX0);
+	en_addr = CVMX_CIU2_EN_PPX_IP3_MBOX_W1S(coreid);
+	cvmx_write_csr(en_addr, mask);
+}
+
+static void octeon_irq_ciu2_mbox_disable_local(struct irq_data *data)
+{
+	u64 mask;
+	u64 en_addr;
+	int coreid = cvmx_get_core_num();
+
+	mask = 1ull << (data->irq - OCTEON_IRQ_MBOX0);
+	en_addr = CVMX_CIU2_EN_PPX_IP3_MBOX_W1C(coreid);
+	cvmx_write_csr(en_addr, mask);
+}
+
+#ifdef CONFIG_SMP
+static int octeon_irq_ciu2_set_affinity(struct irq_data *data,
+					const struct cpumask *dest, bool force)
+{
+	int cpu;
+	bool enable_one = !irqd_irq_disabled(data) && !irqd_irq_masked(data);
+	u64 mask;
+	union octeon_ciu_chip_data cd;
+
+	if (!enable_one)
+		return 0;
+
+	cd.p = irq_data_get_irq_chip_data(data);
+	mask = 1ull << cd.s.bit;
+
+	for_each_online_cpu(cpu) {
+		u64 en_addr;
+		if (cpumask_test_cpu(cpu, dest) && enable_one) {
+			enable_one = false;
+			en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1S(octeon_coreid_for_cpu(cpu)) + (0x1000ull * cd.s.line);
+		} else {
+			en_addr = CVMX_CIU2_EN_PPX_IP2_WRKQ_W1C(octeon_coreid_for_cpu(cpu)) + (0x1000ull * cd.s.line);
+		}
+		cvmx_write_csr(en_addr, mask);
+	}
+
+	return 0;
+}
+#endif
+
+static void octeon_irq_ciu2_enable_gpio(struct irq_data *data)
+{
+	octeon_irq_gpio_setup(data);
+	octeon_irq_ciu2_enable(data);
+}
+
+static void octeon_irq_ciu2_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.gpio_line), 0);
+
+	octeon_irq_ciu2_disable_all(data);
+}
+
+static struct irq_chip octeon_irq_chip_ciu2 = {
+	.name = "CIU2-E",
+	.irq_enable = octeon_irq_ciu2_enable,
+	.irq_disable = octeon_irq_ciu2_disable_all,
+	.irq_ack = octeon_irq_ciu2_ack,
+	.irq_mask = octeon_irq_ciu2_disable_local,
+	.irq_unmask = octeon_irq_ciu2_enable,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = octeon_irq_ciu2_set_affinity,
+	.irq_cpu_offline = octeon_irq_cpu_offline_ciu,
+#endif
+};
+
+static struct irq_chip octeon_irq_chip_ciu2_mbox = {
+	.name = "CIU2-M",
+	.irq_enable = octeon_irq_ciu2_mbox_enable_all,
+	.irq_disable = octeon_irq_ciu2_mbox_disable_all,
+	.irq_ack = octeon_irq_ciu2_mbox_disable_local,
+	.irq_eoi = octeon_irq_ciu2_mbox_enable_local,
+
+	.irq_cpu_online = octeon_irq_ciu2_mbox_enable_local,
+	.irq_cpu_offline = octeon_irq_ciu2_mbox_disable_local,
+	.flags = IRQCHIP_ONOFFLINE_ENABLED,
+};
+
+static struct irq_chip octeon_irq_chip_ciu2_wd = {
+	.name = "CIU2-W",
+	.irq_enable = octeon_irq_ciu2_wd_enable,
+	.irq_disable = octeon_irq_ciu2_disable_all,
+	.irq_mask = octeon_irq_ciu2_disable_local,
+	.irq_unmask = octeon_irq_ciu2_enable_local,
+};
+
+static struct irq_chip octeon_irq_chip_ciu2_gpio = {
+	.name = "CIU-GPIO",
+	.irq_enable = octeon_irq_ciu2_enable_gpio,
+	.irq_disable = octeon_irq_ciu2_disable_gpio,
+	.irq_ack = octeon_irq_ciu_gpio_ack,
+	.irq_mask = octeon_irq_ciu2_disable_local,
+	.irq_unmask = octeon_irq_ciu2_enable,
+	.irq_set_type = octeon_irq_ciu_gpio_set_type,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = octeon_irq_ciu2_set_affinity,
+	.irq_cpu_offline = octeon_irq_cpu_offline_ciu,
+#endif
+	.flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
+static int octeon_irq_ciu2_xlat(struct irq_domain *d,
+				struct device_node *node,
+				const u32 *intspec,
+				unsigned int intsize,
+				unsigned long *out_hwirq,
+				unsigned int *out_type)
+{
+	unsigned int ciu, bit;
+
+	ciu = intspec[0];
+	bit = intspec[1];
+
+	/* Line 7  are the GPIO lines */
+	if (ciu > 6 || bit > 63)
+		return -EINVAL;
+
+	*out_hwirq = (ciu << 6) | bit;
+	*out_type = 0;
+
+	return 0;
+}
+
+static bool octeon_irq_ciu2_is_edge(unsigned int line, unsigned int bit)
+{
+	bool edge = false;
+
+	if (line == 3) /* MIO */
+		switch (bit) {
+		case 2:  /* IPD_DRP */
+		case 8 ... 11: /* Timers */
+		case 48: /* PTP */
+			edge = true;
+			break;
+		default:
+			break;
+		}
+	else if (line == 6) /* PKT */
+		switch (bit) {
+		case 52 ... 53: /* ILK_DRP */
+		case 8 ... 12:  /* GMX_DRP */
+			edge = true;
+			break;
+		default:
+			break;
+		}
+	return edge;
+}
+
+static int octeon_irq_ciu2_map(struct irq_domain *d,
+			       unsigned int virq, irq_hw_number_t hw)
+{
+	unsigned int line = hw >> 6;
+	unsigned int bit = hw & 63;
+
+	if (!octeon_irq_virq_in_range(virq))
+		return -EINVAL;
+
+	/* Line 7  are the GPIO lines */
+	if (line > 6 || octeon_irq_ciu_to_irq[line][bit] != 0)
+		return -EINVAL;
+
+	if (octeon_irq_ciu2_is_edge(line, bit))
+		octeon_irq_set_ciu_mapping(virq, line, bit, 0,
+					   &octeon_irq_chip_ciu2,
+					   handle_edge_irq);
+	else
+		octeon_irq_set_ciu_mapping(virq, line, bit, 0,
+					   &octeon_irq_chip_ciu2,
+					   handle_level_irq);
+
+	return 0;
+}
+static int octeon_irq_ciu2_gpio_map(struct irq_domain *d,
+				    unsigned int virq, irq_hw_number_t hw)
+{
+	return octeon_irq_gpio_map_common(d, virq, hw, 7, &octeon_irq_chip_ciu2_gpio);
+}
+
+static struct irq_domain_ops octeon_irq_domain_ciu2_ops = {
+	.map = octeon_irq_ciu2_map,
+	.xlate = octeon_irq_ciu2_xlat,
+};
+
+static struct irq_domain_ops octeon_irq_domain_ciu2_gpio_ops = {
+	.map = octeon_irq_ciu2_gpio_map,
+	.xlate = octeon_irq_gpio_xlat,
+};
+
+static void octeon_irq_ciu2(void)
+{
+	int line;
+	int bit;
+	int irq;
+	u64 src_reg, src, sum;
+	const unsigned long core_id = cvmx_get_core_num();
+
+	sum = cvmx_read_csr(CVMX_CIU2_SUM_PPX_IP2(core_id)) & 0xfful;
+
+	if (unlikely(!sum))
+		goto spurious;
+
+	line = fls64(sum) - 1;
+	src_reg = CVMX_CIU2_SRC_PPX_IP2_WRKQ(core_id) + (0x1000 * line);
+	src = cvmx_read_csr(src_reg);
+
+	if (unlikely(!src))
+		goto spurious;
+
+	bit = fls64(src) - 1;
+	irq = octeon_irq_ciu_to_irq[line][bit];
+	if (unlikely(!irq))
+		goto spurious;
+
+	do_IRQ(irq);
+	goto out;
+
+spurious:
+	spurious_interrupt();
+out:
+	/* CN68XX pass 1.x has an errata that accessing the ACK registers
+		can stop interrupts from propagating */
+	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
+		cvmx_read_csr(CVMX_CIU2_INTR_CIU_READY);
+	else
+		cvmx_read_csr(CVMX_CIU2_ACK_PPX_IP2(core_id));
+	return;
+}
+
+static void octeon_irq_ciu2_mbox(void)
+{
+	int line;
+
+	const unsigned long core_id = cvmx_get_core_num();
+	u64 sum = cvmx_read_csr(CVMX_CIU2_SUM_PPX_IP3(core_id)) >> 60;
+
+	if (unlikely(!sum))
+		goto spurious;
+
+	line = fls64(sum) - 1;
+
+	do_IRQ(OCTEON_IRQ_MBOX0 + line);
+	goto out;
+
+spurious:
+	spurious_interrupt();
+out:
+	/* CN68XX pass 1.x has an errata that accessing the ACK registers
+		can stop interrupts from propagating */
+	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
+		cvmx_read_csr(CVMX_CIU2_INTR_CIU_READY);
+	else
+		cvmx_read_csr(CVMX_CIU2_ACK_PPX_IP3(core_id));
+	return;
+}
+
+static void __init octeon_irq_init_ciu2(void)
+{
+	unsigned int i;
+	struct device_node *gpio_node;
+	struct device_node *ciu_node;
+	struct irq_domain *ciu_domain = NULL;
+
+	octeon_irq_init_ciu2_percpu();
+	octeon_irq_setup_secondary = octeon_irq_setup_secondary_ciu2;
+
+	octeon_irq_ip2 = octeon_irq_ciu2;
+	octeon_irq_ip3 = octeon_irq_ciu2_mbox;
+	octeon_irq_ip4 = octeon_irq_ip4_mask;
+
+	/* Mips internal */
+	octeon_irq_init_core();
+
+	gpio_node = of_find_compatible_node(NULL, NULL, "cavium,octeon-3860-gpio");
+	if (gpio_node) {
+		struct octeon_irq_gpio_domain_data *gpiod;
+
+		gpiod = kzalloc(sizeof(*gpiod), GFP_KERNEL);
+		if (gpiod) {
+			/* gpio domain host_data is the base hwirq number. */
+			gpiod->base_hwirq = 7 << 6;
+			irq_domain_add_linear(gpio_node, 16, &octeon_irq_domain_ciu2_gpio_ops, gpiod);
+			of_node_put(gpio_node);
+		} else
+			pr_warn("Cannot allocate memory for GPIO irq_domain.\n");
+	} else
+		pr_warn("Cannot find device node for cavium,octeon-3860-gpio.\n");
+
+	ciu_node = of_find_compatible_node(NULL, NULL, "cavium,octeon-6880-ciu2");
+	if (ciu_node) {
+		ciu_domain = irq_domain_add_tree(ciu_node, &octeon_irq_domain_ciu2_ops, NULL);
+		of_node_put(ciu_node);
+	} else
+		panic("Cannot find device node for cavium,octeon-6880-ciu2.");
+
+	/* CUI2 */
+	for (i = 0; i < 64; i++)
+		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_WORKQ0, 0, i);
+
+	for (i = 0; i < 32; i++)
+		octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_WDOG0, 1, i, 0,
+					   &octeon_irq_chip_ciu2_wd, handle_level_irq);
+
+	for (i = 0; i < 4; i++)
+		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_TIMER0, 3, i + 8);
+
+	octeon_irq_force_ciu_mapping(ciu_domain, OCTEON_IRQ_USB0, 3, 44);
+
+	for (i = 0; i < 4; i++)
+		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_PCI_INT0, 4, i);
+
+	for (i = 0; i < 4; i++)
+		octeon_irq_force_ciu_mapping(ciu_domain, i + OCTEON_IRQ_PCI_MSI0, 4, i + 8);
+
+	irq_set_chip_and_handler(OCTEON_IRQ_MBOX0, &octeon_irq_chip_ciu2_mbox, handle_percpu_irq);
+	irq_set_chip_and_handler(OCTEON_IRQ_MBOX1, &octeon_irq_chip_ciu2_mbox, handle_percpu_irq);
+	irq_set_chip_and_handler(OCTEON_IRQ_MBOX2, &octeon_irq_chip_ciu2_mbox, handle_percpu_irq);
+	irq_set_chip_and_handler(OCTEON_IRQ_MBOX3, &octeon_irq_chip_ciu2_mbox, handle_percpu_irq);
+
+	/* Enable the CIU lines */
+	set_c0_status(STATUSF_IP3 | STATUSF_IP2);
+	clear_c0_status(STATUSF_IP4);
+}
+
 void __init arch_init_irq(void)
 {
 #ifdef CONFIG_SMP
@@ -1233,7 +1750,10 @@ void __init arch_init_irq(void)
 	cpumask_clear(irq_default_affinity);
 	cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
 #endif
-	octeon_irq_init_ciu();
+	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
+		octeon_irq_init_ciu2();
+	else
+		octeon_irq_init_ciu();
 }
 
 asmlinkage void plat_irq_dispatch(void)
diff --git a/arch/mips/include/asm/octeon/octeon.h b/arch/mips/include/asm/octeon/octeon.h
index 1e2486e..e937e86 100644
--- a/arch/mips/include/asm/octeon/octeon.h
+++ b/arch/mips/include/asm/octeon/octeon.h
@@ -254,4 +254,7 @@ extern uint64_t octeon_bootloader_entry_addr;
 
 extern void (*octeon_irq_setup_secondary)(void);
 
+typedef void (*octeon_irq_ip4_handler_t)(void);
+void octeon_irq_set_ip4_handler(octeon_irq_ip4_handler_t);
+
 #endif /* __ASM_OCTEON_OCTEON_H */