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Date: Fri, 20 Jun 2014 12:49:43 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Jason Cooper <jason@...edaemon.net>,
Shiraz Hashim <shiraz.linux.kernel@...il.com>,
spear-devel <spear-devel@...t.st.com>
Subject: Re: [patch 08/13] irqchip: spear_shirq: Precalculate status mask
On Fri, Jun 20, 2014 at 3:04 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> Calculate the status mask at compile time, not at runtime.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> drivers/irqchip/spear-shirq.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> Index: linux/drivers/irqchip/spear-shirq.c
> ===================================================================
> --- linux.orig/drivers/irqchip/spear-shirq.c
> +++ linux/drivers/irqchip/spear-shirq.c
> @@ -49,6 +49,7 @@ struct shirq_regs {
> *
> * base: Base register address
> * regs: Register configuration for shared irq block
> + * mask: Mask to apply to the status register
> * virq_base: Base virtual interrupt number
> * nr_irqs: Number of interrupts handled by this block
> * offset: Bit offset of the first interrupt
> @@ -57,6 +58,7 @@ struct shirq_regs {
> struct spear_shirq {
> void __iomem *base;
> struct shirq_regs regs;
> + u32 mask;
> u32 virq_base;
> u32 nr_irqs;
> u32 offset;
> @@ -72,6 +74,7 @@ static DEFINE_SPINLOCK(lock);
> static struct spear_shirq spear300_shirq_ras1 = {
> .offset = 0,
> .nr_irqs = 9,
> + .mask = ((0x1 << 9) - 1) << 0,
> .regs = {
> .enb_reg = SPEAR300_INT_ENB_MASK_REG,
> .status_reg = SPEAR300_INT_STS_MASK_REG,
> @@ -89,6 +92,7 @@ static struct spear_shirq *spear300_shir
> static struct spear_shirq spear310_shirq_ras1 = {
> .offset = 0,
> .nr_irqs = 8,
> + .mask = ((0x1 << 8) - 1) << 0,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR310_INT_STS_MASK_REG,
> @@ -99,6 +103,7 @@ static struct spear_shirq spear310_shirq
> static struct spear_shirq spear310_shirq_ras2 = {
> .offset = 8,
> .nr_irqs = 5,
> + .mask = ((0x1 << 5) - 1) << 8,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR310_INT_STS_MASK_REG,
> @@ -109,6 +114,7 @@ static struct spear_shirq spear310_shirq
> static struct spear_shirq spear310_shirq_ras3 = {
> .offset = 13,
> .nr_irqs = 1,
> + .mask = ((0x1 << 1) - 1) << 13,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR310_INT_STS_MASK_REG,
> @@ -119,6 +125,7 @@ static struct spear_shirq spear310_shirq
> static struct spear_shirq spear310_shirq_intrcomm_ras = {
> .offset = 14,
> .nr_irqs = 3,
> + .mask = ((0x1 << 3) - 1) << 14,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR310_INT_STS_MASK_REG,
> @@ -141,6 +148,7 @@ static struct spear_shirq *spear310_shir
> static struct spear_shirq spear320_shirq_ras3 = {
> .offset = 0,
> .nr_irqs = 7,
> + .mask = ((0x1 << 7) - 1) << 0,
> .disabled = 1,
> .regs = {
> .enb_reg = SPEAR320_INT_ENB_MASK_REG,
> @@ -154,6 +162,7 @@ static struct spear_shirq spear320_shirq
> static struct spear_shirq spear320_shirq_ras1 = {
> .offset = 7,
> .nr_irqs = 3,
> + .mask = ((0x1 << 3) - 1) << 7,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR320_INT_STS_MASK_REG,
> @@ -165,6 +174,7 @@ static struct spear_shirq spear320_shirq
> static struct spear_shirq spear320_shirq_ras2 = {
> .offset = 10,
> .nr_irqs = 1,
> + .mask = ((0x1 << 1) - 1) << 10,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR320_INT_STS_MASK_REG,
> @@ -176,6 +186,7 @@ static struct spear_shirq spear320_shirq
> static struct spear_shirq spear320_shirq_intrcomm_ras = {
> .offset = 11,
> .nr_irqs = 11,
> + .mask = ((0x1 << 11) - 1) << 11,
> .regs = {
> .enb_reg = -1,
> .status_reg = SPEAR320_INT_STS_MASK_REG,
If you like, maybe this instead of above diff:
diff --git a/drivers/irqchip/spear-shirq.c b/drivers/irqchip/spear-shirq.c
index 3fdda3a..40c5c1b 100644
--- a/drivers/irqchip/spear-shirq.c
+++ b/drivers/irqchip/spear-shirq.c
@@ -281,6 +281,8 @@ static int __init shirq_init(struct spear_shirq
**shirq_blocks, int block_nr,
shirq_blocks[i]->base = base;
shirq_blocks[i]->irq_base = irq_find_mapping(shirq_domain,
hwirq);
+ shirq_blocks[i]->mask = ((0x1 << shirq_blocks[i]->nr_irqs) - 1)
+ << shirq_blocks[i]->offset;
shirq_blocks[i]->irq = irq_of_parse_and_map(np, i);
spear_shirq_register(shirq_blocks[i]);
> @@ -239,7 +250,7 @@ static void shirq_handler(unsigned irq,
>
> chip->irq_ack(idata);
>
> - mask = ((0x1 << shirq->nr_irqs) - 1) << shirq->offset;
> + mask = shirq->mask;
> while ((val = readl(shirq->base + shirq->regs.status_reg) &
> mask)) {
>
>
>
--
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