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    Subject[PATCH V8 06/10] irqchip/loongson-htvec: Add suspend/resume support
    Date
    Add suspend/resume support for HTVEC irqchip, which is needed for
    suspend/hibernation.

    Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
    ---
    drivers/irqchip/irq-loongson-htvec.c | 27 +++++++++++++++++++++++++++
    1 file changed, 27 insertions(+)

    diff --git a/drivers/irqchip/irq-loongson-htvec.c b/drivers/irqchip/irq-loongson-htvec.c
    index 8efb00c79b55..8c63165460f9 100644
    --- a/drivers/irqchip/irq-loongson-htvec.c
    +++ b/drivers/irqchip/irq-loongson-htvec.c
    @@ -16,6 +16,7 @@
    #include <linux/of_address.h>
    #include <linux/of_irq.h>
    #include <linux/of_platform.h>
    +#include <linux/syscore_ops.h>

    /* Registers */
    #define HTVEC_EN_OFF 0x20
    @@ -30,6 +31,7 @@ struct htvec {
    struct irq_domain *htvec_domain;
    raw_spinlock_t htvec_lock;
    struct fwnode_handle *domain_handle;
    + u32 saved_vec_en[HTVEC_MAX_PARENT_IRQ];
    };

    static struct htvec *htvec_priv;
    @@ -157,6 +159,29 @@ static void htvec_reset(struct htvec *priv)
    }
    }

    +static int htvec_suspend(void)
    +{
    + int i;
    +
    + for (i = 0; i < htvec_priv->num_parents; i++)
    + htvec_priv->saved_vec_en[i] = readl(htvec_priv->base + HTVEC_EN_OFF + 4 * i);
    +
    + return 0;
    +}
    +
    +static void htvec_resume(void)
    +{
    + int i;
    +
    + for (i = 0; i < htvec_priv->num_parents; i++)
    + writel(htvec_priv->saved_vec_en[i], htvec_priv->base + HTVEC_EN_OFF + 4 * i);
    +}
    +
    +static struct syscore_ops htvec_syscore_ops = {
    + .suspend = htvec_suspend,
    + .resume = htvec_resume,
    +};
    +
    static int htvec_init(phys_addr_t addr, unsigned long size,
    int num_parents, int parent_irq[], struct fwnode_handle *domain_handle)
    {
    @@ -190,6 +215,8 @@ static int htvec_init(phys_addr_t addr, unsigned long size,

    htvec_priv = priv;

    + register_syscore_ops(&htvec_syscore_ops);
    +
    return 0;

    iounmap_base:
    --
    2.27.0
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