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Message-ID: <20251002060732.100213-6-apatel@ventanamicro.com>
Date: Thu, 2 Oct 2025 11:37:26 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Greg KH <gregkh@...uxfoundation.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>
Cc: Alexandre Ghiti <alex@...ti.fr>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Liang Kan <kan.liang@...ux.intel.com>,
Mayuresh Chitale <mchitale@...il.com>,
Anup Patel <anup@...infault.org>,
Atish Patra <atish.patra@...ux.dev>,
Andrew Jones <ajones@...tanamicro.com>,
Sunil V L <sunilvl@...tanamicro.com>,
linux-riscv@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mayuresh Chitale <mchitale@...tanamicro.com>,
Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 05/11] rvtrace: Add trace encoder driver
From: Mayuresh Chitale <mchitale@...tanamicro.com>
Add initial implementation of RISC-V trace encoder driver. The encoder
is defined in the RISC-V Trace Control Interface specification.
Co-developed-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Mayuresh Chitale <mchitale@...tanamicro.com>
---
drivers/hwtracing/rvtrace/Kconfig | 7 ++
drivers/hwtracing/rvtrace/Makefile | 1 +
drivers/hwtracing/rvtrace/rvtrace-encoder.c | 107 ++++++++++++++++++++
3 files changed, 115 insertions(+)
create mode 100644 drivers/hwtracing/rvtrace/rvtrace-encoder.c
diff --git a/drivers/hwtracing/rvtrace/Kconfig b/drivers/hwtracing/rvtrace/Kconfig
index f8f6feea1953..ba35c05f3f54 100644
--- a/drivers/hwtracing/rvtrace/Kconfig
+++ b/drivers/hwtracing/rvtrace/Kconfig
@@ -14,3 +14,10 @@ menuconfig RVTRACE
To compile this driver as a module, choose M here: the module
will be called rvtrace.
+
+config RVTRACE_ENCODER
+ tristate "RISC-V Trace Encoder driver"
+ depends on RVTRACE
+ default y
+ help
+ This driver provides support for RISC-V Trace Encoder component.
diff --git a/drivers/hwtracing/rvtrace/Makefile b/drivers/hwtracing/rvtrace/Makefile
index 988525a379cf..f320693a1fc5 100644
--- a/drivers/hwtracing/rvtrace/Makefile
+++ b/drivers/hwtracing/rvtrace/Makefile
@@ -2,3 +2,4 @@
obj-$(CONFIG_RVTRACE) += rvtrace.o
rvtrace-y := rvtrace-core.o rvtrace-platform.o
+obj-$(CONFIG_RVTRACE_ENCODER) += rvtrace-encoder.o
diff --git a/drivers/hwtracing/rvtrace/rvtrace-encoder.c b/drivers/hwtracing/rvtrace/rvtrace-encoder.c
new file mode 100644
index 000000000000..45d1c5b12c51
--- /dev/null
+++ b/drivers/hwtracing/rvtrace/rvtrace-encoder.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2025 Ventana Micro Systems Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/rvtrace.h>
+#include <linux/types.h>
+
+#define RVTRACE_COMPONENT_CTRL_ITRACE_MASK 0x1
+#define RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT 2
+#define RVTRACE_COMPONENT_CTRL_INSTMODE_MASK 0x7
+#define RVTRACE_COMPONENT_CTRL_INSTMODE_SHIFT 4
+
+static int rvtrace_encoder_start(struct rvtrace_component *comp)
+{
+ u32 val;
+
+ val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET);
+ val |= BIT(RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT);
+ rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET);
+ return rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET,
+ RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT, 1,
+ comp->pdata->control_poll_timeout_usecs);
+}
+
+static int rvtrace_encoder_stop(struct rvtrace_component *comp)
+{
+ u32 val;
+
+ val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET);
+ val &= ~BIT(RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT);
+ rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET);
+ return rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET,
+ RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT, 0,
+ comp->pdata->control_poll_timeout_usecs);
+}
+
+static void rvtrace_encoder_setmode(struct rvtrace_component *comp, u32 mode)
+{
+ u32 val;
+
+ val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET);
+ val |= (mode << RVTRACE_COMPONENT_CTRL_INSTMODE_SHIFT);
+ rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET);
+}
+
+static int rvtrace_encoder_probe(struct rvtrace_component *comp)
+{
+ int ret;
+
+ rvtrace_encoder_setmode(comp, 0x6);
+ ret = rvtrace_enable_component(comp);
+ if (ret)
+ return dev_err_probe(&comp->dev, ret, "failed to enable encoder.\n");
+
+ return 0;
+}
+
+static void rvtrace_encoder_remove(struct rvtrace_component *comp)
+{
+ int ret;
+
+ ret = rvtrace_disable_component(comp);
+ if (ret)
+ dev_err(&comp->dev, "failed to disable encoder.\n");
+}
+
+static struct rvtrace_component_id rvtrace_encoder_ids[] = {
+ { .type = RVTRACE_COMPONENT_TYPE_ENCODER,
+ .version = rvtrace_component_mkversion(1, 0), },
+ {},
+};
+
+static struct rvtrace_driver rvtrace_encoder_driver = {
+ .id_table = rvtrace_encoder_ids,
+ .start = rvtrace_encoder_start,
+ .stop = rvtrace_encoder_stop,
+ .probe = rvtrace_encoder_probe,
+ .remove = rvtrace_encoder_remove,
+ .driver = {
+ .name = "rvtrace-encoder",
+ },
+};
+
+static int __init rvtrace_encoder_init(void)
+{
+ return rvtrace_register_driver(&rvtrace_encoder_driver);
+}
+
+static void __exit rvtrace_encoder_exit(void)
+{
+ rvtrace_unregister_driver(&rvtrace_encoder_driver);
+}
+
+module_init(rvtrace_encoder_init);
+module_exit(rvtrace_encoder_exit);
+
+/* Module information */
+MODULE_AUTHOR("Mayuresh Chitale <mchitale@...tanamicro.com>");
+MODULE_DESCRIPTION("RISC-V Trace Encoder Driver");
+MODULE_LICENSE("GPL");
--
2.43.0
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