linux-kernel - [PATCH 15/24] clocksource/timer-riscv: Refactor riscv_timer_init

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Message-Id: <20230130182225.2471414-16-sunilvl@ventanamicro.com>
Date:   Mon, 30 Jan 2023 23:52:16 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [PATCH 15/24] clocksource/timer-riscv: Refactor riscv_timer_init_dt()

Refactor the timer init function such that few things can be shared by
both DT and ACPI based platforms.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/clocksource/timer-riscv.c | 79 +++++++++++++++----------------
 1 file changed, 37 insertions(+), 42 deletions(-)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 1b4b36df5484..4016c065a01c 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -119,61 +119,28 @@ static irqreturn_t riscv_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int __init riscv_timer_init_dt(struct device_node *n)
+static int __init riscv_timer_init_common(void)
 {
-	int cpuid, error;
-	unsigned long hartid;
-	struct device_node *child;
-	struct irq_domain *domain;
-
-	error = riscv_of_processor_hartid(n, &hartid);
-	if (error < 0) {
-		pr_warn("Not valid hartid for node [%pOF] error = [%lu]\n",
-			n, hartid);
-		return error;
-	}
-
-	cpuid = riscv_hartid_to_cpuid(hartid);
-	if (cpuid < 0) {
-		pr_warn("Invalid cpuid for hartid [%lu]\n", hartid);
-		return cpuid;
-	}
-
-	if (cpuid != smp_processor_id())
-		return 0;
+	int error;
+	struct fwnode_handle *intc_fwnode = riscv_get_intc_hwnode();
+	struct irq_domain *domain = NULL;
 
-	child = of_find_compatible_node(NULL, NULL, "riscv,timer");
-	if (child) {
-		riscv_timer_cannot_wake_cpu = of_property_read_bool(child,
-					"riscv,timer-cannot-wake-cpu");
-		of_node_put(child);
-	}
 
-	domain = NULL;
-	child = of_get_compatible_child(n, "riscv,cpu-intc");
-	if (!child) {
-		pr_err("Failed to find INTC node [%pOF]\n", n);
-		return -ENODEV;
-	}
-	domain = irq_find_host(child);
-	of_node_put(child);
+	domain = irq_find_matching_fwnode(intc_fwnode, DOMAIN_BUS_ANY);
 	if (!domain) {
-		pr_err("Failed to find IRQ domain for node [%pOF]\n", n);
+		pr_err("Failed to find INTC node [%pfwP]\n", intc_fwnode);
 		return -ENODEV;
 	}
 
 	riscv_clock_event_irq = irq_create_mapping(domain, RV_IRQ_TIMER);
 	if (!riscv_clock_event_irq) {
-		pr_err("Failed to map timer interrupt for node [%pOF]\n", n);
-		return -ENODEV;
+		pr_err("Failed to map timer interrupt for node [%pfwP]\n",
+			intc_fwnode);
 	}
 
-	pr_info("%s: Registering clocksource cpuid [%d] hartid [%lu]\n",
-	       __func__, cpuid, hartid);
 	error = clocksource_register_hz(&riscv_clocksource, riscv_timebase);
 	if (error) {
-		pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
-		       error, cpuid);
+		pr_err("clocksource register failed [%d]\n", error);
 		return error;
 	}
 
@@ -199,7 +166,35 @@ static int __init riscv_timer_init_dt(struct device_node *n)
 		static_branch_enable(&riscv_sstc_available);
 	}
 
+	pr_info("timer registered using %s\n",
+		(static_branch_likely(&riscv_sstc_available)) ?
+		"RISC-V Sstc" : "RISC-V SBI");
+
 	return error;
 }
 
+static int __init riscv_timer_init_dt(struct device_node *n)
+{
+	int cpuid, error;
+	unsigned long hartid;
+
+	error = riscv_of_processor_hartid(n, &hartid);
+	if (error < 0) {
+		pr_warn("Not valid hartid for node [%pOF] error = [%lu]\n",
+			n, hartid);
+		return error;
+	}
+
+	cpuid = riscv_hartid_to_cpuid(hartid);
+	if (cpuid < 0) {
+		pr_warn("Invalid cpuid for hartid [%lu]\n", hartid);
+		return cpuid;
+	}
+
+	if (cpuid != smp_processor_id())
+		return 0;
+
+	return riscv_timer_init_common();
+}
+
 TIMER_OF_DECLARE(riscv_timer, "riscv", riscv_timer_init_dt);
-- 
2.38.0