From 206dd13a10119671d7f4bb3a6c90d566dda14a4f Mon Sep 17 00:00:00 2001 From: Sunil V L Date: Tue, 27 Aug 2024 19:51:35 +0200 Subject: irqchip/sifive-plic: Add ACPI support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Björn Töpel Acked-by: Thomas Gleixner Link: https://patch.msgid.link/20240812005929.113499-18-sunilvl@ventanamicro.com [ rjw: Rebase on top of recent irqchip changes ] Signed-off-by: Rafael J. Wysocki --- drivers/irqchip/irq-sifive-plic.c | 99 ++++++++++++++++++++++++++++++--------- 1 file changed, 77 insertions(+), 22 deletions(-) diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index 4d9ea718086d..2f6ef5c495bd 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -4,6 +4,7 @@ * Copyright (C) 2018 Christoph Hellwig */ #define pr_fmt(fmt) "riscv-plic: " fmt +#include #include #include #include @@ -71,6 +72,8 @@ struct plic_priv { unsigned long plic_quirks; unsigned int nr_irqs; unsigned long *prio_save; + u32 gsi_base; + int acpi_plic_id; }; struct plic_handler { @@ -325,6 +328,10 @@ static int plic_irq_domain_translate(struct irq_domain *d, { struct plic_priv *priv = d->host_data; + /* For DT, gsi_base is always zero. */ + if (fwspec->param[0] >= priv->gsi_base) + fwspec->param[0] = 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); @@ -426,17 +433,36 @@ static const struct of_device_id plic_match[] = { {} }; +#ifdef CONFIG_ACPI + +static const struct acpi_device_id plic_acpi_match[] = { + { "RSCV0001", 0 }, + {} +}; +MODULE_DEVICE_TABLE(acpi, plic_acpi_match); + +#endif static int plic_parse_nr_irqs_and_contexts(struct fwnode_handle *fwnode, - u32 *nr_irqs, u32 *nr_contexts) + u32 *nr_irqs, u32 *nr_contexts, + u32 *gsi_base, u32 *id) { int rc; - /* - * Currently, only OF fwnode is supported so extend this - * function for ACPI support. - */ - if (!is_of_node(fwnode)) - return -EINVAL; + if (!is_of_node(fwnode)) { + rc = riscv_acpi_get_gsi_info(fwnode, gsi_base, id, nr_irqs, NULL); + if (rc) { + pr_err("%pfwP: failed to find GSI mapping\n", fwnode); + return rc; + } + + *nr_contexts = acpi_rintc_get_plic_nr_contexts(*id); + if (WARN_ON(!*nr_contexts)) { + pr_err("%pfwP: no PLIC context available\n", fwnode); + return -EINVAL; + } + + return 0; + } rc = of_property_read_u32(to_of_node(fwnode), "riscv,ndev", nr_irqs); if (rc) { @@ -450,22 +476,28 @@ static int plic_parse_nr_irqs_and_contexts(struct fwnode_handle *fwnode, return -EINVAL; } + *gsi_base = 0; + *id = 0; + return 0; } static int plic_parse_context_parent(struct fwnode_handle *fwnode, u32 context, - u32 *parent_hwirq, int *parent_cpu) + u32 *parent_hwirq, int *parent_cpu, u32 id) { struct of_phandle_args parent; unsigned long hartid; int rc; - /* - * Currently, only OF fwnode is supported so extend this - * function for ACPI support. - */ - if (!is_of_node(fwnode)) - return -EINVAL; + if (!is_of_node(fwnode)) { + hartid = acpi_rintc_ext_parent_to_hartid(id, context); + if (hartid == INVALID_HARTID) + return -EINVAL; + + *parent_cpu = riscv_hartid_to_cpuid(hartid); + *parent_hwirq = RV_IRQ_EXT; + return 0; + } rc = of_irq_parse_one(to_of_node(fwnode), context, &parent); if (rc) @@ -489,6 +521,8 @@ static int plic_probe(struct fwnode_handle *fwnode) struct plic_priv *priv; irq_hw_number_t hwirq; void __iomem *regs; + int id, context_id; + u32 gsi_base; if (is_of_node(fwnode)) { const struct of_device_id *id; @@ -501,10 +535,12 @@ static int plic_probe(struct fwnode_handle *fwnode) if (!regs) return -ENOMEM; } else { - return -ENODEV; + regs = devm_platform_ioremap_resource(to_platform_device(fwnode->dev), 0); + if (IS_ERR(regs)) + return PTR_ERR(regs); } - error = plic_parse_nr_irqs_and_contexts(fwnode, &nr_irqs, &nr_contexts); + error = plic_parse_nr_irqs_and_contexts(fwnode, &nr_irqs, &nr_contexts, &gsi_base, &id); if (error) goto fail_free_regs; @@ -518,6 +554,8 @@ static int plic_probe(struct fwnode_handle *fwnode) priv->plic_quirks = plic_quirks; priv->nr_irqs = nr_irqs; priv->regs = regs; + priv->gsi_base = gsi_base; + priv->acpi_plic_id = id; priv->prio_save = bitmap_zalloc(nr_irqs, GFP_KERNEL); if (!priv->prio_save) { @@ -526,12 +564,23 @@ static int plic_probe(struct fwnode_handle *fwnode) } for (i = 0; i < nr_contexts; i++) { - error = plic_parse_context_parent(fwnode, i, &parent_hwirq, &cpu); + error = plic_parse_context_parent(fwnode, i, &parent_hwirq, &cpu, + priv->acpi_plic_id); if (error) { pr_warn("%pfwP: hwirq for context%d not found\n", fwnode, i); continue; } + if (is_of_node(fwnode)) { + context_id = i; + } else { + context_id = acpi_rintc_get_plic_context(priv->acpi_plic_id, i); + if (context_id == INVALID_CONTEXT) { + pr_warn("%pfwP: invalid context id for context%d\n", fwnode, i); + continue; + } + } + /* * Skip contexts other than external interrupts for our * privilege level. @@ -569,10 +618,10 @@ static int plic_probe(struct fwnode_handle *fwnode) cpumask_set_cpu(cpu, &priv->lmask); handler->present = true; handler->hart_base = priv->regs + CONTEXT_BASE + - i * CONTEXT_SIZE; + context_id * CONTEXT_SIZE; raw_spin_lock_init(&handler->enable_lock); handler->enable_base = priv->regs + CONTEXT_ENABLE_BASE + - i * CONTEXT_ENABLE_SIZE; + context_id * CONTEXT_ENABLE_SIZE; handler->priv = priv; handler->enable_save = kcalloc(DIV_ROUND_UP(nr_irqs, 32), @@ -588,8 +637,8 @@ done: nr_handlers++; } - priv->irqdomain = irq_domain_add_linear(to_of_node(fwnode), nr_irqs + 1, - &plic_irqdomain_ops, priv); + priv->irqdomain = irq_domain_create_linear(fwnode, nr_irqs + 1, + &plic_irqdomain_ops, priv); if (WARN_ON(!priv->irqdomain)) goto fail_cleanup_contexts; @@ -626,13 +675,18 @@ done: } } +#ifdef CONFIG_ACPI + if (!acpi_disabled) + acpi_dev_clear_dependencies(ACPI_COMPANION(fwnode->dev)); +#endif + pr_info("%pfwP: mapped %d interrupts with %d handlers for %d contexts.\n", fwnode, nr_irqs, nr_handlers, nr_contexts); return 0; fail_cleanup_contexts: for (i = 0; i < nr_contexts; i++) { - if (plic_parse_context_parent(fwnode, i, &parent_hwirq, &cpu)) + if (plic_parse_context_parent(fwnode, i, &parent_hwirq, &cpu, priv->acpi_plic_id)) continue; if (parent_hwirq != RV_IRQ_EXT || cpu < 0) continue; @@ -663,6 +717,7 @@ static struct platform_driver plic_driver = { .name = "riscv-plic", .of_match_table = plic_match, .suppress_bind_attrs = true, + .acpi_match_table = ACPI_PTR(plic_acpi_match), }, .probe = plic_platform_probe, }; -- cgit v1.2.3