irqchip/mbigen: Create irq domain for each mbigen device

For peripheral devices which connect to mbigen,mbigen is a interrupt
controller. So, we create irq domain for each mbigen device and add
mbigen irq domain into irq hierarchy structure.

Signed-off-by: Ma Jun <majun258@huawei.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index 9f036c22f9b2..2ab1c2d7232c 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -16,13 +16,39 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
 #include <linux/module.h>
+#include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
+/* Interrupt numbers per mbigen node supported */
+#define IRQS_PER_MBIGEN_NODE            128
+
+/* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */
+#define RESERVED_IRQ_PER_MBIGEN_CHIP    64
+
+/* The maximum IRQ pin number of mbigen chip(start from 0) */
+#define MAXIMUM_IRQ_PIN_NUM             1407
+
+/**
+ * In mbigen vector register
+ * bit[21:12]:  event id value
+ * bit[11:0]:   device id
+ */
+#define IRQ_EVENT_ID_SHIFT              12
+#define IRQ_EVENT_ID_MASK               0x3ff
+
+/* register range of each mbigen node */
+#define MBIGEN_NODE_OFFSET              0x1000
+
+/* offset of vector register in mbigen node */
+#define REG_MBIGEN_VEC_OFFSET           0x200
+
 /**
  * struct mbigen_device - holds the information of mbigen device.
  *
@@ -34,10 +60,107 @@ struct mbigen_device {
         void __iomem            *base;
 };
 
+static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
+{
+        unsigned int nid, pin;
+
+        hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
+        nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
+        pin = hwirq % IRQS_PER_MBIGEN_NODE;
+
+        return pin * 4 + nid * MBIGEN_NODE_OFFSET
+                        + REG_MBIGEN_VEC_OFFSET;
+}
+
+static struct irq_chip mbigen_irq_chip = {
+        .name =                 "mbigen-v2",
+};
+
+static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+        struct irq_data *d = irq_get_irq_data(desc->irq);
+        void __iomem *base = d->chip_data;
+        u32 val;
+
+        base += get_mbigen_vec_reg(d->hwirq);
+        val = readl_relaxed(base);
+
+        val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
+        val |= (msg->data << IRQ_EVENT_ID_SHIFT);
+
+        /* The address of doorbell is encoded in mbigen register by default
+         * So,we don't need to program the doorbell address at here
+         */
+        writel_relaxed(val, base);
+}
+
+static int mbigen_domain_translate(struct irq_domain *d,
+                                    struct irq_fwspec *fwspec,
+                                    unsigned long *hwirq,
+                                    unsigned int *type)
+{
+        if (is_of_node(fwspec->fwnode)) {
+                if (fwspec->param_count != 2)
+                        return -EINVAL;
+
+                if ((fwspec->param[0] > MAXIMUM_IRQ_PIN_NUM) ||
+                        (fwspec->param[0] < RESERVED_IRQ_PER_MBIGEN_CHIP))
+                        return -EINVAL;
+                else
+                        *hwirq = fwspec->param[0];
+
+                /* If there is no valid irq type, just use the default type */
+                if ((fwspec->param[1] == IRQ_TYPE_EDGE_RISING) ||
+                        (fwspec->param[1] == IRQ_TYPE_LEVEL_HIGH))
+                        *type = fwspec->param[1];
+                else
+                        return -EINVAL;
+
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static int mbigen_irq_domain_alloc(struct irq_domain *domain,
+                                        unsigned int virq,
+                                        unsigned int nr_irqs,
+                                        void *args)
+{
+        struct irq_fwspec *fwspec = args;
+        irq_hw_number_t hwirq;
+        unsigned int type;
+        struct mbigen_device *mgn_chip;
+        int i, err;
+
+        err = mbigen_domain_translate(domain, fwspec, &hwirq, &type);
+        if (err)
+                return err;
+
+        err = platform_msi_domain_alloc(domain, virq, nr_irqs);
+        if (err)
+                return err;
+
+        mgn_chip = platform_msi_get_host_data(domain);
+
+        for (i = 0; i < nr_irqs; i++)
+                irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+                                      &mbigen_irq_chip, mgn_chip->base);
+
+        return 0;
+}
+
+static struct irq_domain_ops mbigen_domain_ops = {
+        .translate      = mbigen_domain_translate,
+        .alloc          = mbigen_irq_domain_alloc,
+        .free           = irq_domain_free_irqs_common,
+};
+
 static int mbigen_device_probe(struct platform_device *pdev)
 {
         struct mbigen_device *mgn_chip;
         struct resource *res;
+        struct irq_domain *domain;
+        u32 num_pins;
 
         mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
         if (!mgn_chip)
@@ -50,8 +173,23 @@ static int mbigen_device_probe(struct platform_device *pdev)
         if (IS_ERR(mgn_chip->base))
                 return PTR_ERR(mgn_chip->base);
 
+        if (of_property_read_u32(pdev->dev.of_node, "num-pins", &num_pins) < 0) {
+                dev_err(&pdev->dev, "No num-pins property\n");
+                return -EINVAL;
+        }
+
+        domain = platform_msi_create_device_domain(&pdev->dev, num_pins,
+                                                        mbigen_write_msg,
+                                                        &mbigen_domain_ops,
+                                                        mgn_chip);
+
+        if (!domain)
+                return -ENOMEM;
+
         platform_set_drvdata(pdev, mgn_chip);
 
+        dev_info(&pdev->dev, "Allocated %d MSIs\n", num_pins);
+
         return 0;
 }