MLK-16136-9 irqchip: imx-irqsteer: adjust irq config via 'endian'.

Change the irq configurations with adding endianness
determination for different platforms which may choose
different kinds of endianess.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>

diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index 9727445..27afb23 100644 (file)
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -31,6 +31,7 @@ struct irqsteer_irqchip_data {
        struct clk *ipg_clk;
        int irq;
        int channum;
+       int endian;     /* 0: littel endian; 1: big endian */
        struct irq_domain *domain;
        unsigned int irqstat[];
 };
@@ -42,7 +43,8 @@ static void imx_irqsteer_irq_unmask(struct irq_data *d)
        u32 val, idx;
 
        spin_lock(&irqsteer_data->lock);
-       idx = d->hwirq / 32;
+       idx = irqsteer_data->endian ? (irqsteer_data->channum - d->hwirq / 32 - 1) :
+                                     d->hwirq / 32;
        reg = irqsteer_data->regs + CHANMASK(idx);
        val = readl_relaxed(reg);
        val |= 1 << (d->hwirq % 32);
@@ -111,7 +113,9 @@ static void imx_irqsteer_update_irqstat(struct irqsteer_irqchip_data *irqsteer_d
         */
        for (i = 0; i < irqsteer_data->channum; i++)
                irqsteer_data->irqstat[i] = readl_relaxed(irqsteer_data->regs +
-                                               CHANSTATUS(i));
+                                               CHANSTATUS(irqsteer_data->endian ?
+                                                          (irqsteer_data->channum - i - 1) :
+                                                          i));
 }
 
 static void imx_irqsteer_irq_handler(struct irq_desc *desc)
@@ -145,13 +149,18 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
        struct device_node *np = pdev->dev.of_node;
        struct irqsteer_irqchip_data *irqsteer_data;
        struct resource *res;
-       int channum;
+       int channum, endian;
        int ret;
 
        ret = of_property_read_u32(np, "nxp,irqsteer_chans", &channum);
        if (ret)
                channum = 1;
 
+       ret = of_property_read_u32(np, "nxp,endian", &endian);
+       if (ret)
+               /* default is LSB */
+               endian = 0;
+
        irqsteer_data = devm_kzalloc(&pdev->dev, sizeof(*irqsteer_data) +
                                     channum *
                                     sizeof(irqsteer_data->irqstat[0]),
@@ -181,6 +190,7 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
        }
 
        irqsteer_data->channum = channum;
+       irqsteer_data->endian  = endian;
        irqsteer_data->pdev = pdev;
        spin_lock_init(&irqsteer_data->lock);