[PATCH 7/8] powerpc/5200: Refactor mpc5200 interrupt controller driver
Grant Likely
grant.likely at secretlab.ca
Thu Jan 22 07:55:41 EST 2009
From: Grant Likely <grant.likely at secretlab.ca>
Rework the mpc5200-pic driver to simplify it and fix up the setting
of desc->status when set_type is called for internal IRQs (so they
are reported as level, not edge). The simplification is due to
splitting off the handling of external IRQs into a separate block
so they don't need to be handled as exceptions in the normal
CRIT, MAIN and PERP paths.
Signed-off-by: Grant Likely <grant.likely at secretlab.ca>
CC: Wolfram Sang <w.sang at pengutronix.de>
---
arch/powerpc/platforms/52xx/mpc52xx_pic.c | 145 ++++++++++++-----------------
1 files changed, 58 insertions(+), 87 deletions(-)
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
index c0a9559..277c9c5 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
@@ -190,10 +190,10 @@ static void mpc52xx_extirq_ack(unsigned int virq)
static int mpc52xx_extirq_set_type(unsigned int virq, unsigned int flow_type)
{
- struct irq_desc *desc = get_irq_desc(virq);
u32 ctrl_reg, type;
int irq;
int l2irq;
+ void *handler = handle_level_irq;
irq = irq_map[virq].hwirq;
l2irq = irq & MPC52xx_IRQ_L2_MASK;
@@ -201,32 +201,21 @@ static int mpc52xx_extirq_set_type(unsigned int virq, unsigned int flow_type)
pr_debug("%s: irq=%x. l2=%d flow_type=%d\n", __func__, irq, l2irq, flow_type);
switch (flow_type) {
- case IRQF_TRIGGER_HIGH:
- type = 0;
- break;
- case IRQF_TRIGGER_RISING:
- type = 1;
- break;
- case IRQF_TRIGGER_FALLING:
- type = 2;
- break;
- case IRQF_TRIGGER_LOW:
- type = 3;
- break;
+ case IRQF_TRIGGER_HIGH: type = 0; break;
+ case IRQF_TRIGGER_RISING: type = 1; handler = handle_edge_irq; break;
+ case IRQF_TRIGGER_FALLING: type = 2; handler = handle_edge_irq; break;
+ case IRQF_TRIGGER_LOW: type = 3; break;
default:
type = 0;
}
- desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
- desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
- if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
- desc->status |= IRQ_LEVEL;
-
ctrl_reg = in_be32(&intr->ctrl);
ctrl_reg &= ~(0x3 << (22 - (l2irq * 2)));
ctrl_reg |= (type << (22 - (l2irq * 2)));
out_be32(&intr->ctrl, ctrl_reg);
+ __set_irq_handler_unlocked(virq, handler);
+
return 0;
}
@@ -241,6 +230,11 @@ static struct irq_chip mpc52xx_extirq_irqchip = {
/*
* Main interrupt irq_chip
*/
+static int mpc52xx_null_set_type(unsigned int virq, unsigned int flow_type)
+{
+ return 0; /* Do nothing so that the sense mask will get updated */
+}
+
static void mpc52xx_main_mask(unsigned int virq)
{
int irq;
@@ -268,6 +262,7 @@ static struct irq_chip mpc52xx_main_irqchip = {
.mask = mpc52xx_main_mask,
.mask_ack = mpc52xx_main_mask,
.unmask = mpc52xx_main_unmask,
+ .set_type = mpc52xx_null_set_type,
};
/*
@@ -300,6 +295,7 @@ static struct irq_chip mpc52xx_periph_irqchip = {
.mask = mpc52xx_periph_mask,
.mask_ack = mpc52xx_periph_mask,
.unmask = mpc52xx_periph_unmask,
+ .set_type = mpc52xx_null_set_type,
};
/*
@@ -343,9 +339,19 @@ static struct irq_chip mpc52xx_sdma_irqchip = {
.mask = mpc52xx_sdma_mask,
.unmask = mpc52xx_sdma_unmask,
.ack = mpc52xx_sdma_ack,
+ .set_type = mpc52xx_null_set_type,
};
/**
+ * mpc52xx_is_extirq - Returns true if hwirq number is for an external IRQ
+ */
+static int mpc52xx_is_extirq(int l1, int l2)
+{
+ return ((l1 == 0) && (l2 == 0)) ||
+ ((l1 == 1) && (l2 >= 1) && (l2 <= 3));
+}
+
+/**
* mpc52xx_irqhost_xlate - translate virq# from device tree interrupts property
*/
static int mpc52xx_irqhost_xlate(struct irq_host *h, struct device_node *ct,
@@ -363,38 +369,23 @@ static int mpc52xx_irqhost_xlate(struct irq_host *h, struct device_node *ct,
intrvect_l1 = (int)intspec[0];
intrvect_l2 = (int)intspec[1];
- intrvect_type = (int)intspec[2];
+ intrvect_type = (int)intspec[2] & 0x3;
intrvect_linux = (intrvect_l1 << MPC52xx_IRQ_L1_OFFSET) &
MPC52xx_IRQ_L1_MASK;
intrvect_linux |= intrvect_l2 & MPC52xx_IRQ_L2_MASK;
- pr_debug("return %x, l1=%d, l2=%d\n", intrvect_linux, intrvect_l1,
- intrvect_l2);
-
*out_hwirq = intrvect_linux;
- *out_flags = mpc52xx_map_senses[intrvect_type];
+ *out_flags = IRQ_TYPE_LEVEL_LOW;
+ if (mpc52xx_is_extirq(intrvect_l1, intrvect_l2))
+ *out_flags = mpc52xx_map_senses[intrvect_type];
+ pr_debug("return %x, l1=%d, l2=%d\n", intrvect_linux, intrvect_l1,
+ intrvect_l2);
return 0;
}
/**
- * mpc52xx_irqx_gettype - determine the IRQ sense type (level/edge)
- *
- * Only external IRQs need this.
- */
-static int mpc52xx_irqx_gettype(int irq)
-{
- int type;
- u32 ctrl_reg;
-
- ctrl_reg = in_be32(&intr->ctrl);
- type = (ctrl_reg >> (22 - irq * 2)) & 0x3;
-
- return mpc52xx_map_senses[type];
-}
-
-/**
* mpc52xx_irqhost_map - Hook to map from virq to an irq_chip structure
*/
static int mpc52xx_irqhost_map(struct irq_host *h, unsigned int virq,
@@ -402,68 +393,46 @@ static int mpc52xx_irqhost_map(struct irq_host *h, unsigned int virq,
{
int l1irq;
int l2irq;
- struct irq_chip *good_irqchip;
+ struct irq_chip *irqchip;
void *good_handle;
int type;
+ u32 reg;
l1irq = (irq & MPC52xx_IRQ_L1_MASK) >> MPC52xx_IRQ_L1_OFFSET;
l2irq = irq & MPC52xx_IRQ_L2_MASK;
/*
- * Most of ours IRQs will be level low
- * Only external IRQs on some platform may be others
+ * External IRQs are handled differently by the hardware so they are
+ * handled by a dedicated irq_chip structure.
*/
- type = IRQ_TYPE_LEVEL_LOW;
+ if (mpc52xx_is_extirq(l1irq, l2irq)) {
+ reg = in_be32(&intr->ctrl);
+ type = mpc52xx_map_senses[(reg >> (22 - l2irq * 2)) & 0x3];
+ if ((type == IRQ_TYPE_EDGE_FALLING) ||
+ (type == IRQ_TYPE_EDGE_RISING))
+ good_handle = handle_edge_irq;
+ else
+ good_handle = handle_level_irq;
+
+ set_irq_chip_and_handler(virq, &mpc52xx_extirq_irqchip, good_handle);
+ pr_debug("%s: External IRQ%i virq=%x, hw=%x. type=%x\n",
+ __func__, l2irq, virq, (int)irq, type);
+ return 0;
+ }
+ /* It is an internal SOC irq. Choose the correct irq_chip */
switch (l1irq) {
- case MPC52xx_IRQ_L1_CRIT:
- pr_debug("%s: Critical. l2=%x\n", __func__, l2irq);
-
- BUG_ON(l2irq != 0);
-
- type = mpc52xx_irqx_gettype(l2irq);
- good_irqchip = &mpc52xx_extirq_irqchip;
- break;
-
- case MPC52xx_IRQ_L1_MAIN:
- pr_debug("%s: Main IRQ[1-3] l2=%x\n", __func__, l2irq);
-
- if ((l2irq >= 1) && (l2irq <= 3)) {
- type = mpc52xx_irqx_gettype(l2irq);
- good_irqchip = &mpc52xx_extirq_irqchip;
- } else {
- good_irqchip = &mpc52xx_main_irqchip;
- }
- break;
-
- case MPC52xx_IRQ_L1_PERP:
- pr_debug("%s: Peripherals. l2=%x\n", __func__, l2irq);
- good_irqchip = &mpc52xx_periph_irqchip;
- break;
-
- case MPC52xx_IRQ_L1_SDMA:
- pr_debug("%s: SDMA. l2=%x\n", __func__, l2irq);
- good_irqchip = &mpc52xx_sdma_irqchip;
- break;
-
+ case MPC52xx_IRQ_L1_MAIN: irqchip = &mpc52xx_main_irqchip; break;
+ case MPC52xx_IRQ_L1_PERP: irqchip = &mpc52xx_periph_irqchip; break;
+ case MPC52xx_IRQ_L1_SDMA: irqchip = &mpc52xx_sdma_irqchip; break;
default:
- pr_err("%s: invalid virq requested (0x%x)\n", __func__, virq);
+ pr_err("%s: invalid irq: virq=%i, l1=%i, l2=%i\n",
+ __func__, virq, l1irq, l2irq);
return -EINVAL;
}
- switch (type) {
- case IRQ_TYPE_EDGE_FALLING:
- case IRQ_TYPE_EDGE_RISING:
- good_handle = handle_edge_irq;
- break;
- default:
- good_handle = handle_level_irq;
- }
-
- set_irq_chip_and_handler(virq, good_irqchip, good_handle);
-
- pr_debug("%s: virq=%x, hw=%x. type=%x\n", __func__, virq,
- (int)irq, type);
+ set_irq_chip_and_handler(virq, irqchip, handle_level_irq);
+ pr_debug("%s: virq=%x, l1=%i, l2=%i\n", __func__, virq, l1irq, l2irq);
return 0;
}
@@ -502,6 +471,8 @@ void __init mpc52xx_init_irq(void)
panic(__FILE__ ": find_and_map failed on 'mpc5200-bestcomm'. "
"Check node !");
+ pr_debug("MPC5200 IRQ controller mapped to 0x%p\n", intr);
+
/* Disable all interrupt sources. */
out_be32(&sdma->IntPend, 0xffffffff); /* 1 means clear pending */
out_be32(&sdma->IntMask, 0xffffffff); /* 1 means disabled */
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