irqchip/imx-irqsteer: Add multi output interrupts support

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>

1 files changed, 68 insertions, 20 deletions

diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index 67ed86250cbf..d1098f4da6a4 100644
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -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);