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Wysocki" , Len Brown , Bjorn Helgaas , Anup Patel , Thomas Gleixner , Samuel Holland , Robert Moore , Conor Dooley , Haibo Xu , Andrew Jones , Atish Kumar Patra , Drew Fustini , Sunil V L , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Subject: [PATCH v8 17/17] irqchip/sifive-plic: Add ACPI support Date: Mon, 12 Aug 2024 06:29:29 +0530 Message-ID: <20240812005929.113499-18-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240812005929.113499-1-sunilvl@ventanamicro.com> References: <20240812005929.113499-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add ACPI support in PLIC driver. Use the mapping created early during boot to get details about the PLIC. Signed-off-by: Sunil V L Co-developed-by: Haibo Xu Signed-off-by: Haibo Xu Reviewed-by: Anup Patel Tested-by: Bj=C3=83=C2=B6rn T=C3=83=C2=B6pel --- drivers/irqchip/irq-sifive-plic.c | 95 ++++++++++++++++++++++++------- 1 file changed, 74 insertions(+), 21 deletions(-) diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive= -plic.c index 9e22f7e378f5..207cfe18ec7f 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -3,6 +3,7 @@ * Copyright (C) 2017 SiFive * Copyright (C) 2018 Christoph Hellwig */ +#include #include #include #include @@ -70,6 +71,8 @@ struct plic_priv { unsigned long plic_quirks; unsigned int nr_irqs; unsigned long *prio_save; + u32 gsi_base; + int acpi_plic_id; }; =20 struct plic_handler { @@ -324,6 +327,10 @@ static int plic_irq_domain_translate(struct irq_domain= *d, { struct plic_priv *priv =3D d->host_data; =20 + /* For DT, gsi_base is always zero. */ + if (fwspec->param[0] >=3D priv->gsi_base) + fwspec->param[0] =3D fwspec->param[0] - priv->gsi_base; + if (test_bit(PLIC_QUIRK_EDGE_INTERRUPT, &priv->plic_quirks)) return irq_domain_translate_twocell(d, fwspec, hwirq, type); =20 @@ -424,18 +431,37 @@ static const struct of_device_id plic_match[] =3D { {} }; =20 +#ifdef CONFIG_ACPI + +static const struct acpi_device_id plic_acpi_match[] =3D { + { "RSCV0001", 0 }, + {} +}; +MODULE_DEVICE_TABLE(acpi, plic_acpi_match); + +#endif static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev, - u32 *nr_irqs, u32 *nr_contexts) + u32 *nr_irqs, u32 *nr_contexts, + u32 *gsi_base, u32 *id) { struct device *dev =3D &pdev->dev; int rc; =20 - /* - * Currently, only OF fwnode is supported so extend this - * function for ACPI support. - */ - if (!is_of_node(dev->fwnode)) - return -EINVAL; + if (!is_of_node(dev->fwnode)) { + rc =3D riscv_acpi_get_gsi_info(dev->fwnode, gsi_base, id, nr_irqs, NULL); + if (rc) { + dev_err(dev, "failed to find GSI mapping\n"); + return rc; + } + + *nr_contexts =3D acpi_rintc_get_plic_nr_contexts(*id); + if (WARN_ON(!*nr_contexts)) { + dev_err(dev, "no PLIC context available\n"); + return -EINVAL; + } + + return 0; + } =20 rc =3D of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", nr_irq= s); if (rc) { @@ -449,23 +475,29 @@ static int plic_parse_nr_irqs_and_contexts(struct pla= tform_device *pdev, return -EINVAL; } =20 + *gsi_base =3D 0; + *id =3D 0; + return 0; } =20 static int plic_parse_context_parent(struct platform_device *pdev, u32 con= text, - u32 *parent_hwirq, int *parent_cpu) + u32 *parent_hwirq, int *parent_cpu, u32 id) { struct device *dev =3D &pdev->dev; struct of_phandle_args parent; unsigned long hartid; int rc; =20 - /* - * Currently, only OF fwnode is supported so extend this - * function for ACPI support. - */ - if (!is_of_node(dev->fwnode)) - return -EINVAL; + if (!is_of_node(dev->fwnode)) { + hartid =3D acpi_rintc_ext_parent_to_hartid(id, context); + if (hartid =3D=3D INVALID_HARTID) + return -EINVAL; + + *parent_cpu =3D riscv_hartid_to_cpuid(hartid); + *parent_hwirq =3D RV_IRQ_EXT; + return 0; + } =20 rc =3D of_irq_parse_one(to_of_node(dev->fwnode), context, &parent); if (rc) @@ -489,6 +521,8 @@ static int plic_probe(struct platform_device *pdev) u32 nr_irqs, parent_hwirq; struct plic_priv *priv; irq_hw_number_t hwirq; + int id, context_id; + u32 gsi_base; =20 if (is_of_node(dev->fwnode)) { const struct of_device_id *id; @@ -498,7 +532,7 @@ static int plic_probe(struct platform_device *pdev) plic_quirks =3D (unsigned long)id->data; } =20 - error =3D plic_parse_nr_irqs_and_contexts(pdev, &nr_irqs, &nr_contexts); + error =3D plic_parse_nr_irqs_and_contexts(pdev, &nr_irqs, &nr_contexts, &= gsi_base, &id); if (error) return error; =20 @@ -509,6 +543,8 @@ static int plic_probe(struct platform_device *pdev) priv->dev =3D dev; priv->plic_quirks =3D plic_quirks; priv->nr_irqs =3D nr_irqs; + priv->gsi_base =3D gsi_base; + priv->acpi_plic_id =3D id; =20 priv->regs =3D devm_platform_ioremap_resource(pdev, 0); if (WARN_ON(!priv->regs)) @@ -519,12 +555,23 @@ static int plic_probe(struct platform_device *pdev) return -ENOMEM; =20 for (i =3D 0; i < nr_contexts; i++) { - error =3D plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu); + error =3D plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, + priv->acpi_plic_id); if (error) { dev_warn(dev, "hwirq for context%d not found\n", i); continue; } =20 + if (is_of_node(dev->fwnode)) { + context_id =3D i; + } else { + context_id =3D acpi_rintc_get_plic_context(priv->acpi_plic_id, i); + if (context_id =3D=3D INVALID_CONTEXT) { + dev_warn(dev, "invalid context id for context%d\n", i); + continue; + } + } + /* * Skip contexts other than external interrupts for our * privilege level. @@ -562,10 +609,10 @@ static int plic_probe(struct platform_device *pdev) cpumask_set_cpu(cpu, &priv->lmask); handler->present =3D true; handler->hart_base =3D priv->regs + CONTEXT_BASE + - i * CONTEXT_SIZE; + context_id * CONTEXT_SIZE; raw_spin_lock_init(&handler->enable_lock); handler->enable_base =3D priv->regs + CONTEXT_ENABLE_BASE + - i * CONTEXT_ENABLE_SIZE; + context_id * CONTEXT_ENABLE_SIZE; handler->priv =3D priv; =20 handler->enable_save =3D devm_kcalloc(dev, DIV_ROUND_UP(nr_irqs, 32), @@ -581,8 +628,8 @@ static int plic_probe(struct platform_device *pdev) nr_handlers++; } =20 - priv->irqdomain =3D irq_domain_add_linear(to_of_node(dev->fwnode), nr_irq= s + 1, - &plic_irqdomain_ops, priv); + priv->irqdomain =3D irq_domain_create_linear(dev->fwnode, nr_irqs + 1, + &plic_irqdomain_ops, priv); if (WARN_ON(!priv->irqdomain)) goto fail_cleanup_contexts; =20 @@ -619,13 +666,18 @@ static int plic_probe(struct platform_device *pdev) } } =20 +#ifdef CONFIG_ACPI + if (!acpi_disabled) + acpi_dev_clear_dependencies(ACPI_COMPANION(dev)); +#endif + dev_info(dev, "mapped %d interrupts with %d handlers for %d contexts.\n", nr_irqs, nr_handlers, nr_contexts); return 0; =20 fail_cleanup_contexts: for (i =3D 0; i < nr_contexts; i++) { - if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu)) + if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, priv->acpi_p= lic_id)) continue; if (parent_hwirq !=3D RV_IRQ_EXT || cpu < 0) continue; @@ -644,6 +696,7 @@ static struct platform_driver plic_driver =3D { .driver =3D { .name =3D "riscv-plic", .of_match_table =3D plic_match, + .acpi_match_table =3D ACPI_PTR(plic_acpi_match), }, .probe =3D plic_probe, }; --=20 2.43.0