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Subject[PATCH 1/3] FRV: Improve FRV's use of generic IRQ handling
Date
From: David Howells <dhowells@redhat.com>

Improve FRV's use of generic IRQ handling:

(*) Use generic_handle_irq() rather than __do_IRQ() as the latter is obsolete.

(*) Don't implement enable() and disable() ops as these will fall back to
using unmask() and mask().

(*) Provide mask_ack() functions to avoid a call each to mask() and ack().

(*) Make the cascade handlers always return IRQ_HANDLED.

(*) Implement the mask() and unmask() functions in the same order as they're
listed in the ops table.

Signed-Off-By: David Howells <dhowells@redhat.com>
---

arch/frv/kernel/irq-mb93091.c | 36 +++++++++++++++++++-----------------
arch/frv/kernel/irq-mb93093.c | 36 +++++++++++++++++++-----------------
arch/frv/kernel/irq-mb93493.c | 35 ++++++++++++++---------------------
arch/frv/kernel/irq.c | 15 +--------------
4 files changed, 53 insertions(+), 69 deletions(-)

diff --git a/arch/frv/kernel/irq-mb93091.c b/arch/frv/kernel/irq-mb93091.c
index 635d234..369bc0a 100644
--- a/arch/frv/kernel/irq-mb93091.c
+++ b/arch/frv/kernel/irq-mb93091.c
@@ -36,41 +36,45 @@ #define __clr_IFR(M) do { __reg16(0xffc0
/*
* on-motherboard FPGA PIC operations
*/
-static void frv_fpga_enable(unsigned int irq)
+static void frv_fpga_mask(unsigned int irq)
{
uint16_t imr = __get_IMR();

- imr &= ~(1 << (irq - IRQ_BASE_FPGA));
+ imr |= 1 << (irq - IRQ_BASE_FPGA);

__set_IMR(imr);
}

-static void frv_fpga_disable(unsigned int irq)
+static void frv_fpga_ack(unsigned int irq)
+{
+ __clr_IFR(1 << (irq - IRQ_BASE_FPGA));
+}
+
+static void frv_fpga_mask_ack(unsigned int irq)
{
uint16_t imr = __get_IMR();

imr |= 1 << (irq - IRQ_BASE_FPGA);
-
__set_IMR(imr);
-}

-static void frv_fpga_ack(unsigned int irq)
-{
__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
}

-static void frv_fpga_end(unsigned int irq)
+static void frv_fpga_unmask(unsigned int irq)
{
+ uint16_t imr = __get_IMR();
+
+ imr &= ~(1 << (irq - IRQ_BASE_FPGA));
+
+ __set_IMR(imr);
}

static struct irq_chip frv_fpga_pic = {
.name = "mb93091",
- .enable = frv_fpga_enable,
- .disable = frv_fpga_disable,
.ack = frv_fpga_ack,
- .mask = frv_fpga_disable,
- .unmask = frv_fpga_enable,
- .end = frv_fpga_end,
+ .mask = frv_fpga_mask,
+ .mask_ack = frv_fpga_mask_ack,
+ .unmask = frv_fpga_unmask,
};

/*
@@ -79,7 +83,6 @@ static struct irq_chip frv_fpga_pic = {
static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
{
uint16_t imr, mask = (unsigned long) _mask;
- irqreturn_t iret = 0;

imr = __get_IMR();
mask = mask & ~imr & __get_IFR();
@@ -92,11 +95,10 @@ static irqreturn_t fpga_interrupt(int ir
irq = 31 - irq;
mask &= ~(1 << irq);

- if (__do_IRQ(IRQ_BASE_FPGA + irq, regs))
- iret |= IRQ_HANDLED;
+ generic_handle_irq(IRQ_BASE_FPGA + irq, regs);
}

- return iret;
+ return IRQ_HANDLED;
}

/*
diff --git a/arch/frv/kernel/irq-mb93093.c b/arch/frv/kernel/irq-mb93093.c
index f60db79..a43a221 100644
--- a/arch/frv/kernel/irq-mb93093.c
+++ b/arch/frv/kernel/irq-mb93093.c
@@ -35,40 +35,44 @@ #define __clr_IFR(M) do { __reg16(0x02)
/*
* off-CPU FPGA PIC operations
*/
-static void frv_fpga_enable(unsigned int irq)
+static void frv_fpga_mask(unsigned int irq)
{
uint16_t imr = __get_IMR();

- imr &= ~(1 << (irq - IRQ_BASE_FPGA));
-
+ imr |= 1 << (irq - IRQ_BASE_FPGA);
__set_IMR(imr);
}

-static void frv_fpga_disable(unsigned int irq)
+static void frv_fpga_ack(unsigned int irq)
+{
+ __clr_IFR(1 << (irq - IRQ_BASE_FPGA));
+}
+
+static void frv_fpga_mask_ack(unsigned int irq)
{
uint16_t imr = __get_IMR();

imr |= 1 << (irq - IRQ_BASE_FPGA);
-
__set_IMR(imr);
-}

-static void frv_fpga_ack(unsigned int irq)
-{
__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
}

-static void frv_fpga_end(unsigned int irq)
+static void frv_fpga_unmask(unsigned int irq)
{
+ uint16_t imr = __get_IMR();
+
+ imr &= ~(1 << (irq - IRQ_BASE_FPGA));
+
+ __set_IMR(imr);
}

static struct irq_chip frv_fpga_pic = {
.name = "mb93093",
- .enable = frv_fpga_enable,
- .disable = frv_fpga_disable,
.ack = frv_fpga_ack,
- .mask = frv_fpga_disable,
- .unmask = frv_fpga_enable,
+ .mask = frv_fpga_mask,
+ .mask_ack = frv_fpga_mask_ack,
+ .unmask = frv_fpga_unmask,
.end = frv_fpga_end,
};

@@ -78,7 +82,6 @@ static struct irq_chip frv_fpga_pic = {
static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
{
uint16_t imr, mask = (unsigned long) _mask;
- irqreturn_t iret = 0;

imr = __get_IMR();
mask = mask & ~imr & __get_IFR();
@@ -91,11 +94,10 @@ static irqreturn_t fpga_interrupt(int ir
irq = 31 - irq;
mask &= ~(1 << irq);

- if (__do_IRQ(IRQ_BASE_FPGA + irq, regs))
- iret |= IRQ_HANDLED;
+ generic_irq_handle(IRQ_BASE_FPGA + irq, regs);
}

- return iret;
+ return IRQ_HANDLED;
}

/*
diff --git a/arch/frv/kernel/irq-mb93493.c b/arch/frv/kernel/irq-mb93493.c
index 8ad9abf..39c0188 100644
--- a/arch/frv/kernel/irq-mb93493.c
+++ b/arch/frv/kernel/irq-mb93493.c
@@ -43,8 +43,9 @@ #define IRQ_ROUTING \

/*
* daughter board PIC operations
+ * - there is no way to ACK interrupts in the MB93493 chip
*/
-static void frv_mb93493_enable(unsigned int irq)
+static void frv_mb93493_mask(unsigned int irq)
{
uint32_t iqsr;
volatile void *piqsr;
@@ -55,11 +56,15 @@ static void frv_mb93493_enable(unsigned
piqsr = __addr_MB93493_IQSR(0);

iqsr = readl(piqsr);
- iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
+ iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
writel(iqsr, piqsr);
}

-static void frv_mb93493_disable(unsigned int irq)
+static void frv_mb93493_ack(unsigned int irq)
+{
+}
+
+static void frv_mb93493_unmask(unsigned int irq)
{
uint32_t iqsr;
volatile void *piqsr;
@@ -70,26 +75,16 @@ static void frv_mb93493_disable(unsigned
piqsr = __addr_MB93493_IQSR(0);

iqsr = readl(piqsr);
- iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
+ iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
writel(iqsr, piqsr);
}

-static void frv_mb93493_ack(unsigned int irq)
-{
-}
-
-static void frv_mb93493_end(unsigned int irq)
-{
-}
-
static struct irq_chip frv_mb93493_pic = {
.name = "mb93093",
- .enable = frv_mb93493_enable,
- .disable = frv_mb93493_disable,
.ack = frv_mb93493_ack,
- .mask = frv_mb93493_disable,
- .unmask = frv_mb93493_enable,
- .end = frv_mb93493_end,
+ .mask = frv_mb93493_mask,
+ .mask_ack = frv_mb93493_mask,
+ .unmask = frv_mb93493_unmask,
};

/*
@@ -98,7 +93,6 @@ static struct irq_chip frv_mb93493_pic =
static irqreturn_t mb93493_interrupt(int irq, void *_piqsr, struct pt_regs *regs)
{
volatile void *piqsr = _piqsr;
- irqreturn_t iret = 0;
uint32_t iqsr;

iqsr = readl(piqsr);
@@ -112,11 +106,10 @@ static irqreturn_t mb93493_interrupt(int
irq = 31 - irq;
iqsr &= ~(1 << irq);

- if (__do_IRQ(IRQ_BASE_MB93493 + irq, regs))
- iret |= IRQ_HANDLED;
+ generic_handle_irq(IRQ_BASE_MB93493 + irq, regs);
}

- return iret;
+ return IRQ_HANDLED;
}

/*
diff --git a/arch/frv/kernel/irq.c b/arch/frv/kernel/irq.c
index e1ab9f2..5ac041c 100644
--- a/arch/frv/kernel/irq.c
+++ b/arch/frv/kernel/irq.c
@@ -97,19 +97,8 @@ int show_interrupts(struct seq_file *p,
/*
* on-CPU PIC operations
*/
-static void frv_cpupic_enable(unsigned int irqlevel)
-{
- __clr_MASK(irqlevel);
-}
-
-static void frv_cpupic_disable(unsigned int irqlevel)
-{
- __set_MASK(irqlevel);
-}
-
static void frv_cpupic_ack(unsigned int irqlevel)
{
- __set_MASK(irqlevel);
__clr_RC(irqlevel);
__clr_IRL();
}
@@ -138,8 +127,6 @@ static void frv_cpupic_end(unsigned int

static struct irq_chip frv_cpu_pic = {
.name = "cpu",
- .enable = frv_cpupic_enable,
- .disable = frv_cpupic_disable,
.ack = frv_cpupic_ack,
.mask = frv_cpupic_mask,
.mask_ack = frv_cpupic_mask_ack,
@@ -156,7 +143,7 @@ static struct irq_chip frv_cpu_pic = {
asmlinkage void do_IRQ(void)
{
irq_enter();
- __do_IRQ(__get_IRL(), __frame);
+ generic_handle_irq(__get_IRL(), __frame);
irq_exit();
}

-
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