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Date: Tue, 06 Jul 2021 14:10:55 +0100
From: Marc Zyngier <maz@...nel.org>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>,
Huacai Chen <chenhuacai@...il.com>,
Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH 3/9] irqchip/loongson-pch-pic: Add ACPI init support
On Tue, 06 Jul 2021 04:08:58 +0100,
Huacai Chen <chenhuacai@...ngson.cn> wrote:
>
> We are preparing to add new Loongson (based on LoongArch, not MIPS)
> support. LoongArch use ACPI other than DT as its boot protocol, so
> add ACPI init support.
>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
> drivers/irqchip/irq-loongson-pch-pic.c | 120 ++++++++++++++++++++++++-
> 1 file changed, 119 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
> index a4eb8a2181c7..62382611995b 100644
> --- a/drivers/irqchip/irq-loongson-pch-pic.c
> +++ b/drivers/irqchip/irq-loongson-pch-pic.c
> @@ -1,6 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0
> /*
> * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@...goat.com>
> + * Jianmin Lv <lvjianmin@...ngson.cn>
> + * Huacai Chen <chenhuacai@...ngson.cn>
Please drop this change. I'm in a position where I can verify who owns
the copyright to this code, and I seriously doubt that 100 lines of
boilerplate probing code give you any right over it.
> * Loongson PCH PIC support
> */
>
> @@ -15,6 +17,7 @@
> #include <linux/of_address.h>
> #include <linux/of_irq.h>
> #include <linux/of_platform.h>
> +#include <linux/syscore_ops.h>
>
> /* Registers */
> #define PCH_PIC_MASK 0x20
> @@ -32,14 +35,23 @@
> #define PIC_COUNT (PIC_COUNT_PER_REG * PIC_REG_COUNT)
> #define PIC_REG_IDX(irq_id) ((irq_id) / PIC_COUNT_PER_REG)
> #define PIC_REG_BIT(irq_id) ((irq_id) % PIC_COUNT_PER_REG)
> +#define PCH_PIC_SIZE 0x400
> +
> +static int nr_pch_pics;
>
> struct pch_pic {
> void __iomem *base;
> struct irq_domain *pic_domain;
> + struct fwnode_handle *domain_handle;
> u32 ht_vec_base;
> raw_spinlock_t pic_lock;
> + u32 saved_vec_en[PIC_REG_COUNT];
> + u32 saved_vec_pol[PIC_REG_COUNT];
> + u32 saved_vec_edge[PIC_REG_COUNT];
> };
>
> +struct pch_pic *pch_pic_priv[4];
> +
> static void pch_pic_bitset(struct pch_pic *priv, int offset, int bit)
> {
> u32 reg;
> @@ -137,6 +149,7 @@ static struct irq_chip pch_pic_irq_chip = {
> .irq_ack = pch_pic_ack_irq,
> .irq_set_affinity = irq_chip_set_affinity_parent,
> .irq_set_type = pch_pic_set_type,
> + .flags = IRQCHIP_SKIP_SET_WAKE,
> };
>
> static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
> @@ -180,7 +193,7 @@ static void pch_pic_reset(struct pch_pic *priv)
> int i;
>
> for (i = 0; i < PIC_COUNT; i++) {
> - /* Write vectored ID */
> + /* Write vector ID */
> writeb(priv->ht_vec_base + i, priv->base + PCH_INT_HTVEC(i));
> /* Hardcode route to HT0 Lo */
> writeb(1, priv->base + PCH_INT_ROUTE(i));
> @@ -198,6 +211,48 @@ static void pch_pic_reset(struct pch_pic *priv)
> }
> }
>
> +static int pch_pic_suspend(void)
> +{
> + int i, j;
> +
> + for (i = 0; i < nr_pch_pics; i++) {
> + for (j = 0; j < PIC_REG_COUNT; j++) {
> + pch_pic_priv[i]->saved_vec_pol[j] =
> + readl(pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
> + pch_pic_priv[i]->saved_vec_edge[j] =
> + readl(pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
> + pch_pic_priv[i]->saved_vec_en[j] =
> + readl(pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void pch_pic_resume(void)
> +{
> + int i, j;
> +
> + for (i = 0; i < nr_pch_pics; i++) {
> + pch_pic_reset(pch_pic_priv[i]);
> + for (j = 0; j < PIC_REG_COUNT; j++) {
> + writel(pch_pic_priv[i]->saved_vec_pol[j],
> + pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
> + writel(pch_pic_priv[i]->saved_vec_edge[j],
> + pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
> + writel(pch_pic_priv[i]->saved_vec_en[j],
> + pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
> + }
> + }
> +}
> +
> +static struct syscore_ops pch_pic_syscore_ops = {
> + .suspend = pch_pic_suspend,
> + .resume = pch_pic_resume,
> +};
None of this has anything to do with what is described in the commit
message. Please move this into its own patch.
> +
> +#ifdef CONFIG_OF
> +
> static int pch_pic_of_init(struct device_node *node,
> struct device_node *parent)
> {
> @@ -242,6 +297,9 @@ static int pch_pic_of_init(struct device_node *node,
> }
>
> pch_pic_reset(priv);
> + pch_pic_priv[0] = priv;
> +
> + register_syscore_ops(&pch_pic_syscore_ops);
>
> return 0;
>
> @@ -254,3 +312,63 @@ static int pch_pic_of_init(struct device_node *node,
> }
>
> IRQCHIP_DECLARE(pch_pic, "loongson,pch-pic-1.0", pch_pic_of_init);
> +
> +#endif
> +
> +#ifdef CONFIG_ACPI
> +
> +struct fwnode_handle *pch_pic_acpi_init(struct fwnode_handle *parent,
> + struct acpi_madt_bio_pic *acpi_pchpic)
> +{
> + int count;
> + struct pch_pic *priv;
> + struct irq_domain *parent_domain;
> +
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return NULL;
> +
> + raw_spin_lock_init(&priv->pic_lock);
> + priv->base = ioremap(acpi_pchpic->address, acpi_pchpic->size);
> + if (!priv->base)
> + goto free_priv;
> +
> + priv->domain_handle = irq_domain_alloc_fwnode(priv->base);
> + if (!priv->domain_handle) {
> + pr_err("Unable to allocate domain handle\n");
> + goto iounmap_base;
> + }
> +
> + priv->ht_vec_base = acpi_pchpic->gsi_base;
> + count = ((readq(priv->base) >> 48) & 0xff) + 1;
> + parent_domain = irq_find_matching_fwnode(parent, DOMAIN_BUS_ANY);
> + if (!parent_domain) {
> + pr_err("Failed to find the parent domain\n");
> + goto iounmap_base;
> + }
> +
> + priv->pic_domain = irq_domain_create_hierarchy(parent_domain, 0,
> + count, priv->domain_handle,
> + &pch_pic_domain_ops, priv);
> +
> + if (!priv->pic_domain) {
> + pr_err("Failed to create IRQ domain\n");
> + goto iounmap_base;
> + }
> +
> + pch_pic_reset(priv);
> + pch_pic_priv[nr_pch_pics++] = priv;
> +
> + register_syscore_ops(&pch_pic_syscore_ops);
> +
> + return priv->domain_handle;
> +
> +iounmap_base:
> + iounmap(priv->base);
> +free_priv:
> + kfree(priv);
> +
> + return NULL;
> +}
> +
> +#endif
A lot of this code is common with its OF counterpart. How about making
this logic common?
M.
--
Without deviation from the norm, progress is not possible.
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