[PATCH v9 4/4] irqchip:implement the mbigen irq chip operation functions

From: MaJun
Date: Sun Nov 22 2015 - 22:19:57 EST


From: Ma Jun <majun258@xxxxxxxxxx>

Add the interrupt controller chip operation functions of mbigen chip.

Signed-off-by: Ma Jun <majun258@xxxxxxxxxx>
---
drivers/irqchip/irq-mbigen.c | 84 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 84 insertions(+), 0 deletions(-)

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index 81ae61f..540ad05 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -47,6 +47,20 @@
#define REG_MBIGEN_VEC_OFFSET 0x200

/**
+ * offset of clear register in mbigen node
+ * This register is used to clear the status
+ * of interrupt
+ */
+#define REG_MBIGEN_CLEAR_OFFSET 0xa000
+
+/**
+ * offset of interrupt type register
+ * This register is used to configure interrupt
+ * trigger type
+ */
+#define REG_MBIGEN_TYPE_OFFSET 0x0
+
+/**
* struct mbigen_device - holds the information of mbigen device.
*
* @pdev: pointer to the platform device structure of mbigen chip.
@@ -69,8 +83,78 @@ static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
+ REG_MBIGEN_VEC_OFFSET;
}

+static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
+ unsigned int *mask,
+ unsigned int *addr)
+{
+ unsigned int nid, pin, ofst;
+
+ hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
+ nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
+ pin = hwirq % IRQS_PER_MBIGEN_NODE;
+
+ *mask = 1 << (pin % 32);
+
+ ofst = pin / 32 * 4;
+ *addr = ofst + nid * MBIGEN_NODE_OFFSET
+ + REG_MBIGEN_TYPE_OFFSET;
+}
+
+static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
+ unsigned int *mask,
+ unsigned int *addr)
+{
+ unsigned int ofst;
+
+ hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
+ ofst = hwirq / 32 * 4;
+
+ *mask = 1 << (hwirq % 32);
+ *addr = ofst + REG_MBIGEN_CLEAR_OFFSET;
+}
+
+static void mbigen_eoi_irq(struct irq_data *data)
+{
+ void __iomem *base = data->chip_data;
+ unsigned int mask, addr;
+
+ get_mbigen_clear_reg(data->hwirq, &mask, &addr);
+
+ writel_relaxed(mask, base + addr);
+
+ irq_chip_eoi_parent(data);
+}
+
+static int mbigen_set_type(struct irq_data *data, unsigned int type)
+{
+ void __iomem *base = data->chip_data;
+ unsigned int mask, addr;
+ u32 val;
+
+ if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
+ return -EINVAL;
+
+ get_mbigen_type_reg(data->hwirq, &mask, &addr);
+
+ val = readl_relaxed(base + addr);
+
+ if (type == IRQ_TYPE_LEVEL_HIGH)
+ val |= mask;
+ else
+ val &= ~mask;
+
+ writel_relaxed(val, base + addr);
+
+ return 0;
+}
+
static struct irq_chip mbigen_irq_chip = {
.name = "mbigen-v2",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = mbigen_eoi_irq,
+ .irq_set_type = mbigen_set_type,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
};

static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
--
1.7.1


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/