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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 | 130 ++++++++++++++++++++ 3 files changed, 138 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..d189819aecf7 --- /dev/null +++ b/drivers/hwtracing/rvtrace/rvtrace-encoder.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2026 Qualcomm Technologies, Inc. + */ + +#include +#include +#include + +#define RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT 2 +#define RVTRACE_COMPONENT_CTRL_INSTMODE_SHIFT 4 +#define RVTRACE_COMPONENT_CTRL_INSTMODE_OPIT 0x6 + +static int rvtrace_encoder_start(struct rvtrace_component *comp) +{ + int ret; + u32 val; + + val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val |= BIT(RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT); + rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET); + ret = rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET, + RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT, 1, + comp->pdata->control_poll_timeout_usecs); + if (ret) { + dev_err(&comp->dev, "failed to enable encoder.\n"); + return ret; + } + + /* set mode */ + val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val |= (RVTRACE_COMPONENT_CTRL_INSTMODE_OPIT << RVTRACE_COMPONENT_CTRL_INSTMODE_SHIFT); + rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET); + + 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); + ret = rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET, + RVTRACE_COMPONENT_CTRL_ITRACE_SHIFT, 1, + comp->pdata->control_poll_timeout_usecs); + if (ret) + dev_err(&comp->dev, "failed to enable tracing.\n"); + + return ret; +} + +static int rvtrace_encoder_stop(struct rvtrace_component *comp) +{ + int ret; + 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); + ret = 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; + } + + val = rvtrace_read32(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET); + val &= ~BIT(RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT); + rvtrace_write32(comp->pdata, val, RVTRACE_COMPONENT_CTRL_OFFSET); + ret = rvtrace_poll_bit(comp->pdata, RVTRACE_COMPONENT_CTRL_OFFSET, + RVTRACE_COMPONENT_CTRL_ENABLE_SHIFT, 0, + comp->pdata->control_poll_timeout_usecs); + if (ret) { + dev_err(&comp->dev, "failed to disable encoder.\n"); + return ret; + } + + return rvtrace_comp_poll_empty(comp); +} + +static int rvtrace_encoder_probe(struct rvtrace_component *comp) +{ + int ret; + + ret = rvtrace_enable_component(comp->pdata); + 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->pdata); + 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"); +MODULE_DESCRIPTION("RISC-V Trace Encoder Driver"); +MODULE_LICENSE("GPL"); -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv