MIPS: ath79: Prepare moving the MISC driver to drivers/irqchip

To prepare moving out of the arch directory rework the MISC
implementation to use irq domains instead of hard coded IRQ numbers.
Also remove the uses of the ath79_reset_base global pointer in the IRQ
methods.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alexander Couzens <lynxis@fe80.eu>
Cc: Joel Porquet <joel@porquet.org>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11506/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
index 26f8d1b..511c065 100644 (file)
--- a/arch/mips/ath79/irq.c
+++ b/arch/mips/ath79/irq.c
@@ -26,9 +26,13 @@
 #include "common.h"
 #include "machtypes.h"
 
+static void __init ath79_misc_intc_domain_init(
+       struct device_node *node, int irq);
+
 static void ath79_misc_irq_handler(struct irq_desc *desc)
 {
-       void __iomem *base = ath79_reset_base;
+       struct irq_domain *domain = irq_desc_get_handler_data(desc);
+       void __iomem *base = domain->host_data;
        u32 pending;
 
        pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
@@ -42,15 +46,15 @@ static void ath79_misc_irq_handler(struct irq_desc *desc)
        while (pending) {
                int bit = __ffs(pending);
 
-               generic_handle_irq(ATH79_MISC_IRQ(bit));
+               generic_handle_irq(irq_linear_revmap(domain, bit));
                pending &= ~BIT(bit);
        }
 }
 
 static void ar71xx_misc_irq_unmask(struct irq_data *d)
 {
-       unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
-       void __iomem *base = ath79_reset_base;
+       void __iomem *base = irq_data_get_irq_chip_data(d);
+       unsigned int irq = d->hwirq;
        u32 t;
 
        t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
@@ -62,8 +66,8 @@ static void ar71xx_misc_irq_unmask(struct irq_data *d)
 
 static void ar71xx_misc_irq_mask(struct irq_data *d)
 {
-       unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
-       void __iomem *base = ath79_reset_base;
+       void __iomem *base = irq_data_get_irq_chip_data(d);
+       unsigned int irq = d->hwirq;
        u32 t;
 
        t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
@@ -75,8 +79,8 @@ static void ar71xx_misc_irq_mask(struct irq_data *d)
 
 static void ar724x_misc_irq_ack(struct irq_data *d)
 {
-       unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
-       void __iomem *base = ath79_reset_base;
+       void __iomem *base = irq_data_get_irq_chip_data(d);
+       unsigned int irq = d->hwirq;
        u32 t;
 
        t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
@@ -94,12 +98,6 @@ static struct irq_chip ath79_misc_irq_chip = {
 
 static void __init ath79_misc_irq_init(void)
 {
-       void __iomem *base = ath79_reset_base;
-       int i;
-
-       __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
-       __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
-
        if (soc_is_ar71xx() || soc_is_ar913x())
                ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
        else if (soc_is_ar724x() ||
@@ -110,13 +108,7 @@ static void __init ath79_misc_irq_init(void)
        else
                BUG();
 
-       for (i = ATH79_MISC_IRQ_BASE;
-            i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
-               irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
-                                        handle_level_irq);
-       }
-
-       irq_set_chained_handler(ATH79_CPU_IRQ(6), ath79_misc_irq_handler);
+       ath79_misc_intc_domain_init(NULL, ATH79_CPU_IRQ(6));
 }
 
 static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
@@ -259,6 +251,7 @@ asmlinkage void plat_irq_dispatch(void)
 static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
        irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);
+       irq_set_chip_data(irq, d->host_data);
        return 0;
 }
 
@@ -267,19 +260,14 @@ static const struct irq_domain_ops misc_irq_domain_ops = {
        .map = misc_map,
 };
 
-static int __init ath79_misc_intc_of_init(
-       struct device_node *node, struct device_node *parent)
+static void __init ath79_misc_intc_domain_init(
+       struct device_node *node, int irq)
 {
        void __iomem *base = ath79_reset_base;
        struct irq_domain *domain;
-       int irq;
-
-       irq = irq_of_parse_and_map(node, 0);
-       if (!irq)
-               panic("Failed to get MISC IRQ");
 
        domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,
-                       ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);
+                       ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, base);
        if (!domain)
                panic("Failed to add MISC irqdomain");
 
@@ -287,9 +275,19 @@ static int __init ath79_misc_intc_of_init(
        __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
        __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
 
+       irq_set_chained_handler_and_data(irq, ath79_misc_irq_handler, domain);
+}
 
-       irq_set_chained_handler(irq, ath79_misc_irq_handler);
+static int __init ath79_misc_intc_of_init(
+       struct device_node *node, struct device_node *parent)
+{
+       int irq;
+
+       irq = irq_of_parse_and_map(node, 0);
+       if (!irq)
+               panic("Failed to get MISC IRQ");
 
+       ath79_misc_intc_domain_init(node, irq);
        return 0;
 }