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Sat, 01 Nov 2025 08:43:42 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Cc: Alexandre Ghiti , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Mark Rutland , Jiri Olsa , Adrian Hunter , Liang Kan , Mayuresh Chitale , Anup Patel , Atish Patra , Andrew Jones , Sunil V L , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mayuresh Chitale , Anup Patel Subject: [PATCH v2 05/12] rvtrace: Add trace encoder driver Date: Sat, 1 Nov 2025 21:12:38 +0530 Message-ID: <20251101154245.162492-6-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251101154245.162492-1-apatel@ventanamicro.com> References: <20251101154245.162492-1-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mayuresh Chitale 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 Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- 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 =20 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 @@ =20 obj-$(CONFIG_RVTRACE) +=3D rvtrace.o rvtrace-y :=3D rvtrace-core.o rvtrace-platform.o +obj-$(CONFIG_RVTRACE_ENCODER) +=3D rvtrace-encoder.o diff --git a/drivers/hwtracing/rvtrace/rvtrace-encoder.c b/drivers/hwtracin= g/rvtrace/rvtrace-encoder.c new file mode 100644 index 000000000000..69ceb5821709 --- /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 +#include +#include + +#define RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT 2 +#define RVTRACE_COMPONENT_CTRL_INSTMODE_SHIFT 4 + +static int rvtrace_encoder_start(struct rvtrace_component *comp) +{ + u32 val; + + val =3D rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val |=3D 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) +{ + int ret; + u32 val; + + val =3D rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val &=3D ~BIT(RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT); + rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET); + ret =3D rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET, + RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT, 0, + comp->pdata->control_poll_timeout_usecs); + if (ret) { + dev_err(&comp->dev, "failed to stop tracing.\n"); + return ret; + } + + return rvtrace_comp_is_empty(comp); +} + +static void rvtrace_encoder_setmode(struct rvtrace_component *comp, u32 mo= de) +{ + u32 val; + + val =3D rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val |=3D (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 =3D 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 =3D rvtrace_disable_component(comp); + if (ret) + dev_err(&comp->dev, "failed to disable encoder.\n"); +} + +static struct rvtrace_component_id rvtrace_encoder_ids[] =3D { + { .type =3D RVTRACE_COMPONENT_TYPE_ENCODER, + .version =3D rvtrace_component_mkversion(1, 0), }, + {}, +}; + +static struct rvtrace_driver rvtrace_encoder_driver =3D { + .id_table =3D rvtrace_encoder_ids, + .start =3D rvtrace_encoder_start, + .stop =3D rvtrace_encoder_stop, + .probe =3D rvtrace_encoder_probe, + .remove =3D rvtrace_encoder_remove, + .driver =3D { + .name =3D "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 "); +MODULE_DESCRIPTION("RISC-V Trace Encoder Driver"); +MODULE_LICENSE("GPL"); --=20 2.43.0