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irqchip/gic-v2m: Add workaround for APM X-Gene GICv2m erratum 

APM X-Gene GICv2m implementation has an erratum where the
MSI data needs to be the offset from the spi_start in order to
trigger the correct MSI interrupt. This is 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)
of each v2m frame.

This patch reads MSI_IIDR register (present in all GICv2m
implementations) to identify X-Gene GICv2m implementation and
apply workaround to change the data portion of MSI vector.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Duc Dang <dhdang@apm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Duc Dang 2015-10-06 15:32:38 -07:00 committed by Marc Zyngier
parent 6d32ab2d8a
commit ee5f7d6462
1 changed files with 22 additions and 0 deletions
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22
drivers/irqchip/irq-gic-v2m.c
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@ -37,12 +37,19 @@
#define V2M_MSI_SETSPI_NS 0x040
#define V2M_MIN_SPI 32
#define V2M_MAX_SPI 1019
#define V2M_MSI_IIDR 0xFCC
#define V2M_MSI_TYPER_BASE_SPI(x) \
(((x) >> V2M_MSI_TYPER_BASE_SHIFT) & V2M_MSI_TYPER_BASE_MASK)
#define V2M_MSI_TYPER_NUM_SPI(x) ((x) & V2M_MSI_TYPER_NUM_MASK)
/* APM X-Gene with GICv2m MSI_IIDR register value */
#define XGENE_GICV2M_MSI_IIDR 0x06000170
/* List of flags for specific v2m implementation */
#define GICV2M_NEEDS_SPI_OFFSET 0x00000001
struct v2m_data {
spinlock_t msi_cnt_lock;
struct resource res; /* GICv2m resource */
@ -50,6 +57,7 @@ struct v2m_data {
u32 spi_start; /* The SPI number that MSIs start */
u32 nr_spis; /* The number of SPIs for MSIs */
unsigned long *bm; /* MSI vector bitmap */
u32 flags; /* v2m flags for specific implementation */
};
static void gicv2m_mask_msi_irq(struct irq_data *d)
@ -98,6 +106,9 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
msg->address_hi = upper_32_bits(addr);
msg->address_lo = lower_32_bits(addr);
msg->data = data->hwirq;
if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
msg->data -= v2m->spi_start;
}
static struct irq_chip gicv2m_irq_chip = {
@ -266,6 +277,17 @@ static int __init gicv2m_init_one(struct device_node *node,
goto err_iounmap;
}
/*
* APM X-Gene GICv2m implementation has an erratum where
* the MSI data needs to be the offset from the spi_start
* in order to trigger the correct MSI interrupt. This is
* 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).
*/
if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis),
GFP_KERNEL);
if (!v2m->bm) {