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irqchip/imx-irqsteer: Add multi output interrupts support

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One irqsteer channel can support up to 8 output interrupts.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Aisheng Dong 2019-02-20 11:40:51 +00:00 committed by Marc Zyngier
parent deb904e45b
commit 28528fca49
1 changed files with 68 additions and 20 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

88
drivers/irqchip/irq-imx-irqsteer.c
View file

@ -10,6 +10,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
@ -21,10 +22,13 @@
#define CHAN_MINTDIS(t) (CTRL_STRIDE_OFF(t, 3) + 0x4)
#define CHAN_MASTRSTAT(t) (CTRL_STRIDE_OFF(t, 3) + 0x8)
#define CHAN_MAX_OUTPUT_INT 0x8
struct irqsteer_data {
void __iomem *regs;
struct clk *ipg_clk;
int irq;
int irq[CHAN_MAX_OUTPUT_INT];
int irq_count;
raw_spinlock_t lock;
int reg_num;
int channel;
@ -87,23 +91,47 @@ static const struct irq_domain_ops imx_irqsteer_domain_ops = {
.xlate = irq_domain_xlate_onecell,
};
static int imx_irqsteer_get_hwirq_base(struct irqsteer_data *data, u32 irq)
{
int i;
for (i = 0; i < data->irq_count; i++) {
if (data->irq[i] == irq)
return i * 64;
}
return -EINVAL;
}
static void imx_irqsteer_irq_handler(struct irq_desc *desc)
{
struct irqsteer_data *data = irq_desc_get_handler_data(desc);
int i;
int hwirq;
int irq, i;
chained_irq_enter(irq_desc_get_chip(desc), desc);
for (i = 0; i < data->reg_num * 32; i += 32) {
int idx = imx_irqsteer_get_reg_index(data, i);
irq = irq_desc_get_irq(desc);
hwirq = imx_irqsteer_get_hwirq_base(data, irq);
if (hwirq < 0) {
pr_warn("%s: unable to get hwirq base for irq %d\n",
__func__, irq);
return;
}
for (i = 0; i < 2; i++, hwirq += 32) {
int idx = imx_irqsteer_get_reg_index(data, hwirq);
unsigned long irqmap;
int pos, virq;
if (hwirq >= data->reg_num * 32)
break;
irqmap = readl_relaxed(data->regs +
CHANSTATUS(idx, data->reg_num));
for_each_set_bit(pos, &irqmap, 32) {
virq = irq_find_mapping(data->domain, pos + i);
virq = irq_find_mapping(data->domain, pos + hwirq);
if (virq)
generic_handle_irq(virq);
}
@ -117,7 +145,8 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct irqsteer_data *data;
struct resource *res;
int ret;
u32 irqs_num;
int i, ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
@ -130,12 +159,6 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
return PTR_ERR(data->regs);
}
data->irq = platform_get_irq(pdev, 0);
if (data->irq <= 0) {
dev_err(&pdev->dev, "failed to get irq\n");
return -ENODEV;
}
data->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(data->ipg_clk)) {
ret = PTR_ERR(data->ipg_clk);
@ -146,11 +169,15 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
raw_spin_lock_init(&data->lock);
of_property_read_u32(np, "fsl,num-irqs", &data->reg_num);
of_property_read_u32(np, "fsl,num-irqs", &irqs_num);
of_property_read_u32(np, "fsl,channel", &data->channel);
/* one register bit map represents 32 input interrupts */
data->reg_num /= 32;
/*
* There is one output irq for each group of 64 inputs.
* One register bit map can represent 32 input interrupts.
*/
data->irq_count = DIV_ROUND_UP(irqs_num, 64);
data->reg_num = irqs_num / 32;
if (IS_ENABLED(CONFIG_PM_SLEEP)) {
data->saved_reg = devm_kzalloc(&pdev->dev,
@ -173,23 +200,44 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
&imx_irqsteer_domain_ops, data);
if (!data->domain) {
dev_err(&pdev->dev, "failed to create IRQ domain\n");
clk_disable_unprepare(data->ipg_clk);
return -ENOMEM;
ret = -ENOMEM;
goto out;
}
irq_set_chained_handler_and_data(data->irq, imx_irqsteer_irq_handler,
data);
if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT) {
ret = -EINVAL;
goto out;
}
for (i = 0; i < data->irq_count; i++) {
data->irq[i] = irq_of_parse_and_map(np, i);
if (!data->irq[i]) {
ret = -EINVAL;
goto out;
}
irq_set_chained_handler_and_data(data->irq[i],
imx_irqsteer_irq_handler,
data);
}
platform_set_drvdata(pdev, data);
return 0;
out:
clk_disable_unprepare(data->ipg_clk);
return ret;
}
static int imx_irqsteer_remove(struct platform_device *pdev)
{
struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev);
int i;
for (i = 0; i < irqsteer_data->irq_count; i++)
irq_set_chained_handler_and_data(irqsteer_data->irq[i],
NULL, NULL);
irq_set_chained_handler_and_data(irqsteer_data->irq, NULL, NULL);
irq_domain_remove(irqsteer_data->domain);
clk_disable_unprepare(irqsteer_data->ipg_clk);