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path: root/drivers/irqchip/irq-gic-v2m.c
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Diffstat (limited to 'drivers/irqchip/irq-gic-v2m.c')
-rw-r--r--drivers/irqchip/irq-gic-v2m.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 28f047c61baa..ad0d2960b664 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -49,6 +49,9 @@
/* APM X-Gene with GICv2m MSI_IIDR register value */
#define XGENE_GICV2M_MSI_IIDR 0x06000170
+/* Broadcom NS2 GICv2m MSI_IIDR register value */
+#define BCM_NS2_GICV2M_MSI_IIDR 0x0000013f
+
/* List of flags for specific v2m implementation */
#define GICV2M_NEEDS_SPI_OFFSET 0x00000001
@@ -62,6 +65,7 @@ struct v2m_data {
void __iomem *base; /* GICv2m virt address */
u32 spi_start; /* The SPI number that MSIs start */
u32 nr_spis; /* The number of SPIs for MSIs */
+ u32 spi_offset; /* offset to be subtracted from SPI number */
unsigned long *bm; /* MSI vector bitmap */
u32 flags; /* v2m flags for specific implementation */
};
@@ -102,7 +106,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
msg->data = data->hwirq;
if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
- msg->data -= v2m->spi_start;
+ msg->data -= v2m->spi_offset;
}
static struct irq_chip gicv2m_irq_chip = {
@@ -340,9 +344,20 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
* different from the standard GICv2m implementation where
* the MSI data is the absolute value within the range from
* spi_start to (spi_start + num_spis).
+ *
+ * Broadom NS2 GICv2m implementation has an erratum where the MSI data
+ * is 'spi_number - 32'
*/
- if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
+ switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) {
+ case XGENE_GICV2M_MSI_IIDR:
+ v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+ v2m->spi_offset = v2m->spi_start;
+ break;
+ case BCM_NS2_GICV2M_MSI_IIDR:
v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+ v2m->spi_offset = 32;
+ break;
+ }
v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis),
GFP_KERNEL);