[PATCH V2 3/4] irq: imx-irqsteer: change to use reg_num instead of irq_group

Aisheng Dong
2019-01-30T13:06:52Z

One group can manage 64 interrupts by using two registers (e.g. STATUS/SET).
However, the integrated irqsteer may support only 32 interrupts which
needs only one register in a group. But the current driver assume there's
a mininum of two registers in a group which result in a wrong register map
for 32 interrupts per channel irqsteer. Let's use the reg_num caculated by
interrupts per channel instead of irq_group to cover this case.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v1->v2:
* The using of property name updated accordingly
---
drivers/irqchip/irq-imx-irqsteer.c | 35 +++++++++++++++++++----------------
1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index 5b3f1d7..67ed862 100644
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -13,7 +13,7 @@
#include <linux/of_platform.h>
#include <linux/spinlock.h>

-#define CTRL_STRIDE_OFF(_t, _r) (_t * 8 * _r)
+#define CTRL_STRIDE_OFF(_t, _r) (_t * 4 * _r)
#define CHANCTRL 0x0
#define CHANMASK(n, t) (CTRL_STRIDE_OFF(t, 0) + 0x4 * (n) + 0x4)
#define CHANSET(n, t) (CTRL_STRIDE_OFF(t, 1) + 0x4 * (n) + 0x4)
@@ -26,7 +26,7 @@ struct irqsteer_data {
struct clk *ipg_clk;
int irq;
raw_spinlock_t lock;
- int irq_groups;
+ int reg_num;
int channel;
struct irq_domain *domain;
u32 *saved_reg;
@@ -35,7 +35,7 @@ struct irqsteer_data {
static int imx_irqsteer_get_reg_index(struct irqsteer_data *data,
unsigned long irqnum)
{
- return (data->irq_groups * 2 - irqnum / 32 - 1);
+ return (data->reg_num - irqnum / 32 - 1);
}

static void imx_irqsteer_irq_unmask(struct irq_data *d)
@@ -46,9 +46,9 @@ static void imx_irqsteer_irq_unmask(struct irq_data *d)
u32 val;

raw_spin_lock_irqsave(&data->lock, flags);
- val = readl_relaxed(data->regs + CHANMASK(idx, data->irq_groups));
+ val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num));
val |= BIT(d->hwirq % 32);
- writel_relaxed(val, data->regs + CHANMASK(idx, data->irq_groups));
+ writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num));
raw_spin_unlock_irqrestore(&data->lock, flags);
}

@@ -60,9 +60,9 @@ static void imx_irqsteer_irq_mask(struct irq_data *d)
u32 val;

raw_spin_lock_irqsave(&data->lock, flags);
- val = readl_relaxed(data->regs + CHANMASK(idx, data->irq_groups));
+ val = readl_relaxed(data->regs + CHANMASK(idx, data->reg_num));
val &= ~BIT(d->hwirq % 32);
- writel_relaxed(val, data->regs + CHANMASK(idx, data->irq_groups));
+ writel_relaxed(val, data->regs + CHANMASK(idx, data->reg_num));
raw_spin_unlock_irqrestore(&data->lock, flags);
}

@@ -94,13 +94,13 @@ static void imx_irqsteer_irq_handler(struct irq_desc *desc)

chained_irq_enter(irq_desc_get_chip(desc), desc);

- for (i = 0; i < data->irq_groups * 64; i += 32) {
+ for (i = 0; i < data->reg_num * 32; i += 32) {
int idx = imx_irqsteer_get_reg_index(data, i);
unsigned long irqmap;
int pos, virq;

irqmap = readl_relaxed(data->regs +
- CHANSTATUS(idx, data->irq_groups));
+ CHANSTATUS(idx, data->reg_num));

for_each_set_bit(pos, &irqmap, 32) {
virq = irq_find_mapping(data->domain, pos + i);
@@ -146,12 +146,15 @@ static int imx_irqsteer_probe(struct platform_device *pdev)

raw_spin_lock_init(&data->lock);

- of_property_read_u32(np, "fsl,irq-groups", &data->irq_groups);
+ of_property_read_u32(np, "fsl,num-irqs", &data->reg_num);
of_property_read_u32(np, "fsl,channel", &data->channel);

+ /* one register bit map represents 32 input interrupts */
+ data->reg_num /= 32;
+
if (IS_ENABLED(CONFIG_PM_SLEEP)) {
data->saved_reg = devm_kzalloc(&pdev->dev,
- sizeof(u32) * data->irq_groups * 2,
+ sizeof(u32) * data->reg_num,
GFP_KERNEL);
if (!data->saved_reg)
return -ENOMEM;
@@ -166,7 +169,7 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
/* steer all IRQs into configured channel */
writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);

- data->domain = irq_domain_add_linear(np, data->irq_groups * 64,
+ data->domain = irq_domain_add_linear(np, data->reg_num * 32,
&imx_irqsteer_domain_ops, data);
if (!data->domain) {
dev_err(&pdev->dev, "failed to create IRQ domain\n");
@@ -199,9 +202,9 @@ static void imx_irqsteer_save_regs(struct irqsteer_data *data)
{
int i;

- for (i = 0; i < data->irq_groups * 2; i++)
+ for (i = 0; i < data->reg_num; i++)
data->saved_reg[i] = readl_relaxed(data->regs +
- CHANMASK(i, data->irq_groups));
+ CHANMASK(i, data->reg_num));
}

static void imx_irqsteer_restore_regs(struct irqsteer_data *data)
@@ -209,9 +212,9 @@ static void imx_irqsteer_restore_regs(struct irqsteer_data *data)
int i;

writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
- for (i = 0; i < data->irq_groups * 2; i++)
+ for (i = 0; i < data->reg_num; i++)
writel_relaxed(data->saved_reg[i],
- data->regs + CHANMASK(i, data->irq_groups));
+ data->regs + CHANMASK(i, data->reg_num));
}

static int imx_irqsteer_suspend(struct device *dev)
--
2.7.4