[PATCH v6 11/12] irqchip: ti-sci-inta: Add msi domain support

[Lokesh Vutla]

Add a msi domain that is child to the INTA domain. Clients
uses the INTA msi bus layer to allocate irqs in this
msi domain.

Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com>
---
Changes since v5:
- New patch. Seperated out msi domain part from the intial patch.

Marc,
        I feel this is too simple to be a separate driver. So I am
        sticking it into the same file.

 drivers/irqchip/Kconfig           |  1 +
 drivers/irqchip/irq-ti-sci-inta.c | 39 ++++++++++++++++++++++++++++++-
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 946c062fcec0..e0a1ec55ca93 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -441,6 +441,7 @@ config TI_SCI_INTA_IRQCHIP
        depends on TI_SCI_PROTOCOL && ARCH_K3
        select IRQ_DOMAIN
        select IRQ_DOMAIN_HIERARCHY
+       select TI_SCI_INTA_MSI_DOMAIN
        help
          This enables the irqchip driver support for K3 Interrupt aggregator
          over TI System Control Interface available on some new TI's SoCs.
diff --git a/drivers/irqchip/irq-ti-sci-inta.c 
b/drivers/irqchip/irq-ti-sci-inta.c
index 3eb935ebe10f..945e635847b2 100644
--- a/drivers/irqchip/irq-ti-sci-inta.c
+++ b/drivers/irqchip/irq-ti-sci-inta.c
@@ -18,6 +18,7 @@
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/soc/ti/ti_sci_protocol.h>
+#include <linux/soc/ti/ti_sci_inta_msi.h>
 #include <linux/irqchip/chained_irq.h>
 #include <asm-generic/msi.h>
 
@@ -28,6 +29,9 @@
 #define HWIRQ_TO_DEVID(hwirq)  (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
                                 (TI_SCI_DEV_ID_MASK))
 #define HWIRQ_TO_IRQID(hwirq)  ((hwirq) & (TI_SCI_IRQ_ID_MASK))
+#define TO_HWIRQ(dev, index)   ((((dev) & TI_SCI_DEV_ID_MASK) << \
+                                TI_SCI_DEV_ID_SHIFT) | \
+                               ((index) & TI_SCI_IRQ_ID_MASK))
 
 #define MAX_EVENTS_PER_VINT    64
 #define VINT_ENABLE_SET_OFFSET 0x0
@@ -528,9 +532,32 @@ static const struct irq_domain_ops 
ti_sci_inta_irq_domain_ops = {
        .free           = ti_sci_inta_irq_domain_free,
 };
 
+static struct irq_chip ti_sci_inta_msi_irq_chip = {
+       .name                   = "MSI-INTA",
+       .flags                  = IRQCHIP_SUPPORTS_LEVEL_MSI,
+};
+
+static void ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg,
+                                    struct msi_desc *desc)
+{
+       arg->desc = desc;
+       arg->hwirq = TO_HWIRQ(desc->inta.dev_id, desc->inta.index);
+}
+
+static struct msi_domain_ops ti_sci_inta_msi_ops = {
+       .set_desc       = ti_sci_inta_msi_set_desc,
+};
+
+static struct msi_domain_info ti_sci_inta_msi_domain_info = {
+       .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+                  MSI_FLAG_LEVEL_CAPABLE),
+       .ops    = &ti_sci_inta_msi_ops,
+       .chip   = &ti_sci_inta_msi_irq_chip,
+};
+
 static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
 {
-       struct irq_domain *parent_domain, *domain;
+       struct irq_domain *parent_domain, *domain, *msi_domain;
        struct device_node *parent_node, *node;
        struct ti_sci_inta_irq_domain *inta;
        struct device *dev = &pdev->dev;
@@ -596,6 +623,16 @@ static int ti_sci_inta_irq_domain_probe(struct 
platform_device *pdev)
                return -ENOMEM;
        }
 
+       msi_domain =
+               ti_sci_inta_msi_create_irq_domain(of_node_to_fwnode(node),
+                                                 &ti_sci_inta_msi_domain_info,
+                                                 domain);
+       if (!msi_domain) {
+               irq_domain_remove(domain);
+               dev_err(dev, "Failed to allocate msi domain\n");
+               return -ENOMEM;
+       }
+
        INIT_LIST_HEAD(&inta->vint_list);
        mutex_init(&inta->vint_mutex);
 
-- 
2.21.0