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Date: Sat, 6 Mar 2021 11:06:51 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Qing Zhang <zhangqing@...ngson.cn>
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
"open list:MIPS" <linux-mips@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>, wangming01@...ngson.cn
Subject: Re: [PATCH v3 5/7] irqchip/loongson-liointc: irqchip add 2.0 version
Hi, Qing,
On Sat, Mar 6, 2021 at 10:36 AM Qing Zhang <zhangqing@...ngson.cn> wrote:
>
> Add IO interrupt controller support for Loongson 2k1000, different
> from the 3a series is that 2K1000 has 64 interrupt sources, 0-31
> correspond to the device tree liointc0 device node, and the other
> correspond to liointc1 node.
Use the formal name (Loongson-2K1000, Loongson-3A series), please.
Huacai
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
> ---
>
> v2-v3: No change
>
> drivers/irqchip/irq-loongson-liointc.c | 55 +++++++++++++++++++++-----
> 1 file changed, 46 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
> index 09b91b81851c..1c3c80f7f9f5 100644
> --- a/drivers/irqchip/irq-loongson-liointc.c
> +++ b/drivers/irqchip/irq-loongson-liointc.c
> @@ -20,6 +20,7 @@
>
> #define LIOINTC_CHIP_IRQ 32
> #define LIOINTC_NUM_PARENT 4
> +#define LIOINTC_NUM_CORES 4
>
> #define LIOINTC_INTC_CHIP_START 0x20
>
> @@ -42,6 +43,7 @@ struct liointc_handler_data {
> struct liointc_priv {
> struct irq_chip_generic *gc;
> struct liointc_handler_data handler[LIOINTC_NUM_PARENT];
> + void __iomem *core_isr[LIOINTC_NUM_CORES];
> u8 map_cache[LIOINTC_CHIP_IRQ];
> bool has_lpc_irq_errata;
> };
> @@ -51,11 +53,12 @@ static void liointc_chained_handle_irq(struct irq_desc *desc)
> struct liointc_handler_data *handler = irq_desc_get_handler_data(desc);
> struct irq_chip *chip = irq_desc_get_chip(desc);
> struct irq_chip_generic *gc = handler->priv->gc;
> + int core = get_ebase_cpunum() % LIOINTC_NUM_CORES;
> u32 pending;
>
> chained_irq_enter(chip, desc);
>
> - pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS);
> + pending = readl(handler->priv->core_isr[core]);
>
> if (!pending) {
> /* Always blame LPC IRQ if we have that bug */
> @@ -141,6 +144,15 @@ static void liointc_resume(struct irq_chip_generic *gc)
> }
>
> static const char * const parent_names[] = {"int0", "int1", "int2", "int3"};
> +static const char * const core_reg_names[] = {"isr0", "isr1", "isr2", "isr3"};
> +
> +static void __iomem *liointc_get_reg_byname(struct device_node *node,
> + const char *name)
> +{
> + int index = of_property_match_string(node, "reg-names", name);
> +
> + return of_iomap(node, index);
> +}
>
> static int __init liointc_of_init(struct device_node *node,
> struct device_node *parent)
> @@ -159,10 +171,28 @@ static int __init liointc_of_init(struct device_node *node,
> if (!priv)
> return -ENOMEM;
>
> - base = of_iomap(node, 0);
> - if (!base) {
> - err = -ENODEV;
> - goto out_free_priv;
> + if (of_device_is_compatible(node, "loongson,liointc-2.0")) {
> + base = liointc_get_reg_byname(node, "main");
> + if (!base) {
> + err = -ENODEV;
> + goto out_free_priv;
> + }
> + for (i = 0; i < LIOINTC_NUM_CORES; i++) {
> + priv->core_isr[i] =
> + liointc_get_reg_byname(node, core_reg_names[i]);
> + }
> + if (!priv->core_isr[0]) {
> + err = -ENODEV;
> + goto out_iounmap_base;
> + }
> + } else {
> + base = of_iomap(node, 0);
> + if (!base) {
> + err = -ENODEV;
> + goto out_free_priv;
> + }
> + for (i = 0; i < LIOINTC_NUM_CORES; i++)
> + priv->core_isr[i] = base + LIOINTC_REG_INTC_STATUS;
> }
>
> for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
> @@ -172,7 +202,7 @@ static int __init liointc_of_init(struct device_node *node,
> }
> if (!have_parent) {
> err = -ENODEV;
> - goto out_iounmap;
> + goto out_iounmap_isr;
> }
>
> sz = of_property_read_variable_u32_array(node,
> @@ -183,7 +213,7 @@ static int __init liointc_of_init(struct device_node *node,
> if (sz < 4) {
> pr_err("loongson-liointc: No parent_int_map\n");
> err = -ENODEV;
> - goto out_iounmap;
> + goto out_iounmap_isr;
> }
>
> for (i = 0; i < LIOINTC_NUM_PARENT; i++)
> @@ -195,7 +225,7 @@ static int __init liointc_of_init(struct device_node *node,
> if (!domain) {
> pr_err("loongson-liointc: cannot add IRQ domain\n");
> err = -EINVAL;
> - goto out_iounmap;
> + goto out_iounmap_isr;
> }
>
> err = irq_alloc_domain_generic_chips(domain, 32, 1,
> @@ -260,7 +290,13 @@ static int __init liointc_of_init(struct device_node *node,
>
> out_free_domain:
> irq_domain_remove(domain);
> -out_iounmap:
> +out_iounmap_isr:
> + for (i = 0; i < LIOINTC_NUM_CORES; i++) {
> + if (!priv->core_isr[i])
> + continue;
> + iounmap(priv->core_isr[i]);
> + }
> +out_iounmap_base:
> iounmap(base);
> out_free_priv:
> kfree(priv);
> @@ -270,3 +306,4 @@ static int __init liointc_of_init(struct device_node *node,
>
> IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init);
> IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);
> +IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);
> --
> 2.20.1
>
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