From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sarath Ganapathiraju Date: Tue, 14 Jul 2026 01:35:33 +0530 Subject: [PATCH 2/2] ASoC: Add LPASS VA CSR heartbeat pulse clock MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260714-master-v1-2-1ebe5993225e@oss.qualcomm.com> References: <20260714-master-v1-0-1ebe5993225e@oss.qualcomm.com> In-Reply-To: <20260714-master-v1-0-1ebe5993225e@oss.qualcomm.com> To: Srinivas Kandagatla , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jaroslav Kysela , Takashi Iwai Cc: Srinivas Kandagatla , linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, prasad.kumpatla@oss.qualcomm.com, Sarath Ganapathiraju X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1783973132; l=6958; i=sarath.ganapathiraju@oss.qualcomm.com; s=default; h=from:subject:message-id; bh=ypNbWhmhzRsGcz5RvLQ5KhScCqzC7URlIIzBE8KzUXI=; b=jWXpRi8qLEsCDpGs2R6QKLBtDQk4IyUTfcDPlrAlxRTTyCCZ928q3c0qQxjMrF4WR4+pz5iXF JUKHA4nbeKHBchnSagbHeaPQ8gxJSjduHsSAb8bDp2qnSFVGguuddYQ X-Developer-Key: i=sarath.ganapathiraju@oss.qualcomm.com; a=ed25519; pk=4p2FWGXM+F2sir13Lu5stw5aKX5trUymK/ttESvgxQg= X-Endpoint-Received: by B4 Relay for sarath.ganapathiraju@oss.qualcomm.com/default with auth_id=870 List-Id: B4 Relay Submissions The HeartBeat Pulse (also known as RateGen Pulse) synchronizes the start of the DMAs and Codec Interfaces for the audio usecases and can serve as a periodic wakeup source for the DSP. Add the LPASS VA CSR driver that models the rate generator as a clock provider so it is enabled and disabled automatically alongside the other clocks during runtime PM resume and suspend. Signed-off-by: Sarath Ganapathiraju --- sound/soc/codecs/Kconfig | 13 ++++ sound/soc/codecs/Makefile | 2 + sound/soc/codecs/lpass-va-csr.c | 143 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 158 insertions(+) diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index a41d0f508..e898c34a6 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -2902,11 +2902,24 @@ config SND_SOC_LPASS_WSA_MACRO select SND_SOC_LPASS_MACRO_COMMON tristate "Qualcomm WSA Macro in LPASS(Low Power Audio SubSystem)" +config SND_SOC_LPASS_VA_CSR + depends on COMMON_CLK + select REGMAP_MMIO + tristate "Qualcomm LPASS VA CSR heartbeat pulse clock provider" + help + Qualcomm LPASS VA CSR block contains the rate generator hardware + that produces the HeartBeat Pulse (also known as RateGen Pulse). + This driver models the rate generator as a clock provider so + that consumers can enable or disable it via the common clock + framework, and it can be used to synchronize the start of DMAs + and Codec Interfaces or as a periodic wakeup source for the DSP. + config SND_SOC_LPASS_VA_MACRO depends on COMMON_CLK depends on PM_CLK select REGMAP_MMIO select SND_SOC_LPASS_MACRO_COMMON + select SND_SOC_LPASS_VA_CSR tristate "Qualcomm VA Macro in LPASS(Low Power Audio SubSystem)" config SND_SOC_LPASS_RX_MACRO diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index aa0396e5b..3e86c1bbf 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -163,6 +163,7 @@ snd-soc-lpass-rx-macro-y := lpass-rx-macro.o snd-soc-lpass-tx-macro-y := lpass-tx-macro.o snd-soc-lpass-wsa-macro-y := lpass-wsa-macro.o snd-soc-lpass-va-macro-y := lpass-va-macro.o +snd-soc-lpass-va-csr-y := lpass-va-csr.o snd-soc-madera-y := madera.o snd-soc-max9759-y := max9759.o snd-soc-max9768-y := max9768.o @@ -886,6 +887,7 @@ obj-$(CONFIG_SND_SOC_TPA6130A2) += snd-soc-tpa6130a2.o obj-$(CONFIG_SND_SOC_LPASS_MACRO_COMMON) += snd-soc-lpass-macro-common.o obj-$(CONFIG_SND_SOC_LPASS_WSA_MACRO) += snd-soc-lpass-wsa-macro.o obj-$(CONFIG_SND_SOC_LPASS_VA_MACRO) += snd-soc-lpass-va-macro.o +obj-$(CONFIG_SND_SOC_LPASS_VA_CSR) += snd-soc-lpass-va-csr.o obj-$(CONFIG_SND_SOC_LPASS_RX_MACRO) += snd-soc-lpass-rx-macro.o obj-$(CONFIG_SND_SOC_LPASS_TX_MACRO) += snd-soc-lpass-tx-macro.o diff --git a/sound/soc/codecs/lpass-va-csr.c b/sound/soc/codecs/lpass-va-csr.c new file mode 100644 index 000000000..14aec8f94 --- /dev/null +++ b/sound/soc/codecs/lpass-va-csr.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#include +#include +#include +#include +#include +#include + +#define LPASS_RATE_GEN_CTRL 0xD000 +#define LPASS_RATE_GEN_COUNTER_0 0xD004 +#define LPASS_RATE_GEN_DELAY 0xD010 + +#define LPASS_RATE_GEN_MAX_REG LPASS_RATE_GEN_DELAY + +#define LPASS_RG_CTRL_EN BIT(0) + +struct lpass_va_csr_data { + u32 counter_0; + u32 delay; +}; + +static const struct lpass_va_csr_data hawi_csr_data = { + .counter_0 = 0x960, + .delay = 0x16, +}; + +static const struct regmap_config lpass_rate_gen_regmap_config = { + .name = "lpass_rate_gen", + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = LPASS_RATE_GEN_MAX_REG, + .cache_type = REGCACHE_MAPLE, +}; + +struct lpass_va_csr { + struct regmap *regmap; + const struct lpass_va_csr_data *data; + struct clk_hw hb_hw; +}; + +#define to_lpass_va_csr(_hw) container_of(_hw, struct lpass_va_csr, hb_hw) + +static int heartbeat_pulse_enable(struct clk_hw *hw) +{ + struct lpass_va_csr *csr = to_lpass_va_csr(hw); + + regmap_write(csr->regmap, LPASS_RATE_GEN_COUNTER_0, csr->data->counter_0); + regmap_write(csr->regmap, LPASS_RATE_GEN_DELAY, csr->data->delay); + regmap_update_bits(csr->regmap, LPASS_RATE_GEN_CTRL, + LPASS_RG_CTRL_EN, LPASS_RG_CTRL_EN); + + return 0; +} + +static void heartbeat_pulse_disable(struct clk_hw *hw) +{ + struct lpass_va_csr *csr = to_lpass_va_csr(hw); + + regmap_update_bits(csr->regmap, LPASS_RATE_GEN_CTRL, + LPASS_RG_CTRL_EN, 0); +} + +static int heartbeat_pulse_is_enabled(struct clk_hw *hw) +{ + struct lpass_va_csr *csr = to_lpass_va_csr(hw); + unsigned int val; + + regmap_read(csr->regmap, LPASS_RATE_GEN_CTRL, &val); + + return !!(val & LPASS_RG_CTRL_EN); +} + +static const struct clk_ops heartbeat_pulse_ops = { + .enable = heartbeat_pulse_enable, + .disable = heartbeat_pulse_disable, + .is_enabled = heartbeat_pulse_is_enabled, +}; + +static int lpass_va_csr_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct lpass_va_csr *csr; + struct clk_init_data init = { + .name = "lpass_heartbeat_pulse", + .ops = &heartbeat_pulse_ops, + }; + void __iomem *base; + int ret; + + csr = devm_kzalloc(dev, sizeof(*csr), GFP_KERNEL); + if (!csr) + return -ENOMEM; + + csr->data = of_device_get_match_data(dev); + if (!csr->data) + return dev_err_probe(dev, -EINVAL, "no variant data for compatible\n"); + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + csr->regmap = devm_regmap_init_mmio(dev, base, + &lpass_rate_gen_regmap_config); + if (IS_ERR(csr->regmap)) + return dev_err_probe(dev, PTR_ERR(csr->regmap), + "failed to init regmap\n"); + + csr->hb_hw.init = &init; + + ret = devm_clk_hw_register(dev, &csr->hb_hw); + if (ret) + return dev_err_probe(dev, ret, "failed to register heartbeat clock\n"); + + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &csr->hb_hw); + if (ret) + return dev_err_probe(dev, ret, "failed to add clock provider\n"); + + return 0; +} + +static const struct of_device_id lpass_va_csr_dt_match[] = { + { .compatible = "qcom,hawi-lpass-va-csr", .data = &hawi_csr_data }, + {} +}; +MODULE_DEVICE_TABLE(of, lpass_va_csr_dt_match); + +static struct platform_driver lpass_va_csr_driver = { + .driver = { + .name = "qcom-lpass-va-csr", + .of_match_table = lpass_va_csr_dt_match, + }, + .probe = lpass_va_csr_probe, +}; + +module_platform_driver(lpass_va_csr_driver); + +MODULE_DESCRIPTION("Qualcomm LPASS VA CSR heartbeat pulse clock provider"); +MODULE_LICENSE("GPL"); -- 2.34.1