[PATCH v7 13/14] irqchip: ti-sci-inta: Add msi domain support

Lokesh Vutla
2019-04-20T10:09:49Z

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 <lokeshvutla@ti.com>
---
Changes since v6:
- Updated to get device id from platform device.

drivers/irqchip/Kconfig | 1 +
drivers/irqchip/irq-ti-sci-inta.c | 40 ++++++++++++++++++++++++++++++-
2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 7c84a71bcd88..1fab40487d63 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -441,6 +441,7 @@ config TI_SCI_INTA_IRQCHIP
depends on TI_SCI_PROTOCOL
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 71e5b45ab4ce..53a356795ebf 100644
--- a/drivers/irqchip/irq-ti-sci-inta.c
+++ b/drivers/irqchip/irq-ti-sci-inta.c
@@ -18,6 +18,7 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/irqchip/chained_irq.h>
+#include <linux/soc/ti/ti_sci_inta_msi.h>
#include <linux/soc/ti/ti_sci_protocol.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
@@ -496,9 +500,34 @@ static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = {
.alloc = ti_sci_inta_irq_domain_alloc,
};

+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)
+{
+ struct platform_device *pdev = to_platform_device(desc->dev);
+
+ arg->desc = desc;
+ arg->hwirq = TO_HWIRQ(pdev->id, desc->inta.dev_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;
@@ -563,6 +592,15 @@ 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