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Wysocki" , Len Brown , Anup Patel , Thomas Gleixner , Bjorn Helgaas , Haibo Xu , Conor Dooley , Andrew Jones , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Marc Zyngier , Sunil V L Subject: [RFC PATCH v3 15/17] ACPI: RISC-V: Create APLIC platform device Date: Tue, 19 Dec 2023 23:15:24 +0530 Message-Id: <20231219174526.2235150-16-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231219174526.2235150-1-sunilvl@ventanamicro.com> References: <20231219174526.2235150-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785733655489825243 X-GMAIL-MSGID: 1785733655489825243 Since APLIC needs to be a platform device, probe the MADT and create platform devices for each APLIC in the system. Signed-off-by: Sunil V L --- drivers/acpi/riscv/init.c | 2 + drivers/acpi/riscv/init.h | 5 ++ drivers/acpi/riscv/irq.c | 118 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 125 insertions(+) create mode 100644 drivers/acpi/riscv/init.h diff --git a/drivers/acpi/riscv/init.c b/drivers/acpi/riscv/init.c index b5807bbdb171..e7eff7ab1474 100644 --- a/drivers/acpi/riscv/init.c +++ b/drivers/acpi/riscv/init.c @@ -6,7 +6,9 @@ */ #include +#include "init.h" void __init acpi_riscv_init(void) { + riscv_acpi_aplic_platform_init(); } diff --git a/drivers/acpi/riscv/init.h b/drivers/acpi/riscv/init.h new file mode 100644 index 000000000000..17bcf0baaadb --- /dev/null +++ b/drivers/acpi/riscv/init.h @@ -0,0 +1,5 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#include + +void __init riscv_acpi_imsic_platform_init(void); +void __init riscv_acpi_aplic_platform_init(void); diff --git a/drivers/acpi/riscv/irq.c b/drivers/acpi/riscv/irq.c index 36e0525b3235..d08a851ab6dc 100644 --- a/drivers/acpi/riscv/irq.c +++ b/drivers/acpi/riscv/irq.c @@ -6,7 +6,36 @@ */ #include +#include +#include +#include #include +#include "init.h" + +static LIST_HEAD(ext_intc_list); + +struct ext_intc_fwnode_list { + struct fwnode_handle *fwnode; + u32 gsi_base; + u32 nr_irqs; + struct list_head list; +}; + +struct fwnode_handle *ext_entc_get_gsi_domain_id(u32 gsi) +{ + struct ext_intc_fwnode_list *ext_intc_element; + struct list_head *i, *tmp; + + /* Find the External Interrupt controller that manages this GSI. */ + list_for_each_safe(i, tmp, &ext_intc_list) { + ext_intc_element = list_entry(i, struct ext_intc_fwnode_list, list); + if (gsi >= ext_intc_element->gsi_base && + gsi < (ext_intc_element->gsi_base + ext_intc_element->nr_irqs)) + return ext_intc_element->fwnode; + } + + return NULL; +} static int irqchip_cmp_func(const void *in0, const void *in1) { @@ -30,3 +59,92 @@ void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) return; sort(ape, nr, sizeof(*ape), irqchip_cmp_func, NULL); } + +static int __init irqchip_add_platform_device(char *irqchip_name, u32 irqchip_id, + resource_size_t iomem_res_start, + resource_size_t iomem_res_size, + u32 gsi_base, + u32 nr_irqs, + union acpi_subtable_headers *header) +{ + struct ext_intc_fwnode_list *ext_intc_element; + struct platform_device *pdev; + struct fwnode_handle *fn; + struct resource *res; + int ret; + + fn = irq_domain_alloc_named_id_fwnode(irqchip_name, irqchip_id); + if (!fn) + return -ENOMEM; + + pdev = platform_device_alloc(irqchip_name, irqchip_id); + if (!pdev) { + irq_domain_free_fwnode(fn); + return -ENOMEM; + } + + res = kcalloc(1, sizeof(*res), GFP_KERNEL); + if (!res) { + irq_domain_free_fwnode(fn); + platform_device_put(pdev); + return -ENOMEM; + } + + ext_intc_element = kcalloc(1, sizeof(*ext_intc_element), GFP_KERNEL); + if (!ext_intc_element) + return -ENOMEM; + + ext_intc_element->fwnode = fn; + ext_intc_element->gsi_base = gsi_base; + ext_intc_element->nr_irqs = nr_irqs; + list_add_tail(&ext_intc_element->list, &ext_intc_list); + + res->start = iomem_res_start; + res->end = res->start + iomem_res_size - 1; + res->flags = IORESOURCE_MEM; + ret = platform_device_add_resources(pdev, res, 1); + /* + * Resources are duplicated in platform_device_add_resources, + * free their allocated memory + */ + kfree(res); + + /* + * Add copy of aplic pointer so that platform driver get aplic details. + */ + ret = platform_device_add_data(pdev, &header, sizeof(header)); + if (ret) { + irq_domain_free_fwnode(fn); + platform_device_put(pdev); + return ret; + } + + pdev->dev.fwnode = fn; + ret = platform_device_add(pdev); + if (ret) { + irq_domain_free_fwnode(fn); + platform_device_put(pdev); + return ret; + } + + return 0; +} + +static int __init aplic_parse_madt(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_madt_aplic *aplic = (struct acpi_madt_aplic *)header; + + return irqchip_add_platform_device("riscv-aplic", + aplic->id, + aplic->base_addr, + aplic->size, + aplic->gsi_base, + aplic->num_sources, + header); +} + +void __init riscv_acpi_aplic_platform_init(void) +{ + acpi_table_parse_madt(ACPI_MADT_TYPE_APLIC, aplic_parse_madt, 0); +}