linux-kernel - [RFC PATCH v2 20/21] ACPI: RISC-V: Create APLIC platform device

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Date:   Thu, 26 Oct 2023 01:53:43 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-serial@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Anup Patel <anup@...infault.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Kumar Patra <atishp@...osinc.com>,
        Haibo Xu <haibo1.xu@...el.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v2 20/21] ACPI: RISC-V: Create APLIC platform device

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 <sunilvl@...tanamicro.com>
---
 drivers/acpi/riscv/init.c |  2 ++
 drivers/acpi/riscv/init.h |  5 +++
 drivers/acpi/riscv/irq.c  | 74 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 81 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 <linux/acpi.h>
+#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 <linux/init.h>
+
+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..fbccecdcbf8b 100644
--- a/drivers/acpi/riscv/irq.c
+++ b/drivers/acpi/riscv/irq.c
@@ -6,6 +6,8 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/irqdomain.h>
+#include <linux/platform_device.h>
 #include <linux/sort.h>
 
 static int irqchip_cmp_func(const void *in0, const void *in1)
@@ -30,3 +32,75 @@ 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,
+					      union acpi_subtable_headers *header)
+{
+	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;
+	}
+
+	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, header);
+}
+
+void __init riscv_acpi_aplic_platform_init(void)
+{
+	acpi_table_parse_madt(ACPI_MADT_TYPE_APLIC, aplic_parse_madt, 0);
+}
-- 
2.39.2