Message-Id: <20210714153039.28373-13-srinivas.kandagatla@linaro.org>
Date:   Wed, 14 Jul 2021 16:30:35 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     bjorn.andersson@...aro.org, broonie@...nel.org, robh@...nel.org
Cc:     plai@...eaurora.org, tiwai@...e.de, devicetree@...r.kernel.org,
        perex@...ex.cz, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, lgirdwood@...il.com,
        bgoswami@...eaurora.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v2 12/16] ASoC: qcom: audioreach: add q6prm support

Add support to q6prm (Proxy Resource Manager) module used for clock resources

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 sound/soc/qcom/Kconfig             |   4 +
 sound/soc/qcom/audioreach/Makefile |   2 +
 sound/soc/qcom/audioreach/q6prm.c  | 414 +++++++++++++++++++++++++++++
 3 files changed, 420 insertions(+)
 create mode 100644 sound/soc/qcom/audioreach/q6prm.c

diff --git a/sound/soc/qcom/Kconfig b/sound/soc/qcom/Kconfig
index eb4446206710..5f7d7d956355 100644
--- a/sound/soc/qcom/Kconfig
+++ b/sound/soc/qcom/Kconfig
@@ -109,12 +109,16 @@ config SND_SOC_QCOM_APM_DAI
 config SND_SOC_QCOM_APM_BEDAI
 	tristate
 
+config SND_SOC_QCOM_PRM
+	tristate
+
 config SND_SOC_QCOM_AUDIOREACH
 	tristate "SoC ALSA audio drives for Qualcomm AUDIOREACH"
 	depends on QCOM_GPR
 	select SND_SOC_TOPOLOGY
 	select SND_SOC_QCOM_APM_DAI
 	select SND_SOC_QCOM_APM_BEDAI
+	select SND_SOC_QCOM_PRM
 	help
 	 Support for AudioReach in QDSP
 
diff --git a/sound/soc/qcom/audioreach/Makefile b/sound/soc/qcom/audioreach/Makefile
index e8651455b206..d9904201ccf0 100644
--- a/sound/soc/qcom/audioreach/Makefile
+++ b/sound/soc/qcom/audioreach/Makefile
@@ -2,9 +2,11 @@
 snd-ar-objs := audioreach.o q6apm.o topology.o
 snd-apm-dai-objs := q6apm-dai.o
 snd-apm-bedai-objs := q6apm-bedai.o
+snd-prm-objs := q6prm.o
 
 obj-$(CONFIG_SND_SOC_QCOM_AUDIOREACH) += snd-ar.o
 obj-$(CONFIG_SND_SOC_QCOM_APM_DAI) += snd-apm-dai.o
 obj-$(CONFIG_SND_SOC_QCOM_APM_BEDAI) += snd-apm-bedai.o
+obj-$(CONFIG_SND_SOC_QCOM_PRM) += snd-prm.o
 
 
diff --git a/sound/soc/qcom/audioreach/q6prm.c b/sound/soc/qcom/audioreach/q6prm.c
new file mode 100644
index 000000000000..2cadb7b28a1c
--- /dev/null
+++ b/sound/soc/qcom/audioreach/q6prm.c
@@ -0,0 +1,414 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2021, Linaro Limited
+
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/of_platform.h>
+#include <linux/clk-provider.h>
+#include <linux/jiffies.h>
+#include <linux/soc/qcom/apr.h>
+#include <dt-bindings/soc/qcom,gpr.h>
+#include <dt-bindings/sound/qcom,q6apm.h>
+#include "audioreach.h"
+
+#define Q6PRM_MAX_CLK_ID			104
+
+#define Q6PRM_CLK(id) &(struct q6prm_clk) {		\
+		.clk_id	= id,				\
+		.afe_clk_id	= Q6PRM_##id,		\
+		.name = #id,				\
+		.attributes = LPASS_CLK_ATTRIBUTE_COUPLE_NO, \
+		.rate = 19200000,			\
+		.hw.init = &(struct clk_init_data) {	\
+			.ops = &clk_q6prm_ops,		\
+			.name = #id,			\
+		},					\
+	}
+
+#define Q6PRM_VOTE_CLK(id, blkid) &(struct q6prm_clk) { \
+		.clk_id	= id,				\
+		.afe_clk_id = blkid,			\
+		.hw.init = &(struct clk_init_data) {	\
+			.ops = &clk_vote_q6prm_ops,	\
+			.name = #id,			\
+		},					\
+	}
+
+struct q6prm_clk {
+	struct device *dev;
+	int clk_id;
+	int afe_clk_id;
+	char *name;
+	int attributes;
+	int rate;
+	uint32_t handle;
+	struct clk_hw hw;
+};
+#define to_q6prm_clk(_hw) container_of(_hw, struct q6prm_clk, hw)
+
+struct q6prm {
+	struct device *dev;
+	gpr_device_t *gdev;
+	wait_queue_head_t wait;
+	struct gpr_ibasic_rsp_result_t result;
+	struct mutex lock;
+	struct q6prm_clk **clks;
+	int num_clks;
+};
+
+#define PRM_CMD_REQUEST_HW_RSC		0x0100100F
+#define PRM_CMD_RSP_REQUEST_HW_RSC	0x02001002
+#define PRM_CMD_RELEASE_HW_RSC		0x01001010
+#define PRM_CMD_RSP_RELEASE_HW_RSC	0x02001003
+
+#define PARAM_ID_RSC_HW_CORE		0x08001032
+#define PARAM_ID_RSC_LPASS_CORE		0x0800102B
+#define PARAM_ID_RSC_AUDIO_HW_CLK	0x0800102C
+
+#define Q6PRM_LPASS_CLK_ID_WSA_CORE_MCLK			0x305
+#define Q6PRM_LPASS_CLK_ID_WSA_CORE_NPL_MCLK			0x306
+
+#define Q6PRM_LPASS_CLK_ID_VA_CORE_MCLK				0x307
+#define Q6PRM_LPASS_CLK_ID_VA_CORE_2X_MCLK			0x308
+
+#define Q6PRM_LPASS_CLK_ID_TX_CORE_MCLK				0x30c
+#define Q6PRM_LPASS_CLK_ID_TX_CORE_NPL_MCLK			0x30d
+
+#define Q6PRM_LPASS_CLK_ID_RX_CORE_MCLK				0x30e
+#define Q6PRM_LPASS_CLK_ID_RX_CORE_NPL_MCLK			0x30f
+
+#define Q6PRM_LPASS_CLK_SRC_INTERNAL	1
+#define Q6PRM_LPASS_CLK_ROOT_DEFAULT	0
+#define Q6PRM_HW_CORE_ID_LPASS		1
+#define Q6PRM_HW_CORE_ID_DCODEC		2
+
+struct prm_cmd_request_hw_core {
+	struct apm_module_param_data param_data;
+	uint32_t hw_clk_id;
+} __packed;
+
+struct prm_cmd_request_rsc {
+	struct apm_module_param_data param_data;
+	uint32_t num_clk_id;
+	struct audio_hw_clk_cfg clock_ids[1];
+} __packed;
+
+struct prm_cmd_release_rsc {
+	struct apm_module_param_data param_data;
+	uint32_t num_clk_id;
+	struct audio_hw_clk_cfg clock_ids[1];
+} __packed;
+
+static int q6prm_send_cmd_sync(struct q6prm *prm, struct gpr_pkt *pkt,
+			uint32_t rsp_opcode)
+{
+	gpr_device_t *gdev = prm->gdev;
+	struct gpr_hdr *hdr = &pkt->hdr;
+	int rc;
+
+	mutex_lock(&prm->lock);
+	prm->result.opcode = 0;
+	prm->result.status = 0;
+
+	rc = gpr_send_pkt(prm->gdev, pkt);
+	if (rc < 0)
+		goto err;
+
+	if (rsp_opcode)
+		rc = wait_event_timeout(prm->wait,
+					(prm->result.opcode == hdr->opcode) ||
+					(prm->result.opcode == rsp_opcode),
+					5 * HZ);
+	else
+		rc = wait_event_timeout(prm->wait,
+					(prm->result.opcode == hdr->opcode),
+					5 * HZ);
+
+	if (!rc) {
+		dev_err(&gdev->dev, "CMD timeout for [%x] opcode\n",
+			hdr->opcode);
+		rc = -ETIMEDOUT;
+	} else if (prm->result.status > 0) {
+		dev_err(&gdev->dev, "DSP returned error[%x] %x\n", hdr->opcode,
+			prm->result.status);
+		rc = -EINVAL;
+	} else {
+		dev_err(&gdev->dev, "DSP returned [%x]\n",
+			prm->result.status);
+		rc = 0;
+	}
+
+err:
+	mutex_unlock(&prm->lock);
+	return rc;
+}
+
+static int q6prm_set_hw_core_req(struct device *dev, uint32_t hw_block_id,   bool enable)
+{
+	struct prm_cmd_request_hw_core *req;
+	struct apm_module_param_data *param_data;
+	struct gpr_pkt *pkt;
+	struct q6prm *prm = dev_get_drvdata(dev);
+	gpr_device_t *gdev  = prm->gdev;
+	void *p;
+	int rc = 0;
+	uint32_t opcode, rsp_opcode;
+
+	if (enable) {
+		opcode = PRM_CMD_REQUEST_HW_RSC;
+		rsp_opcode = PRM_CMD_RSP_REQUEST_HW_RSC;
+	} else {
+		opcode = PRM_CMD_RELEASE_HW_RSC;
+		rsp_opcode = PRM_CMD_RSP_RELEASE_HW_RSC;
+	}
+
+	p = audioreach_alloc_cmd_pkt(sizeof(*req), opcode, 0, gdev->svc.id,
+				     GPR_PRM_MODULE_IID);
+	if (IS_ERR(p))
+		return -ENOMEM;
+
+	pkt = p;
+	req = p + GPR_HDR_SIZE + APM_CMD_HDR_SIZE;
+
+	param_data = &req->param_data;
+
+	param_data->module_instance_id = GPR_PRM_MODULE_IID;
+	param_data->error_code = 0;
+	param_data->param_id = PARAM_ID_RSC_HW_CORE;
+	param_data->param_size = sizeof(*req) - APM_MODULE_PARAM_DATA_SIZE;
+
+	req->hw_clk_id = hw_block_id;
+
+	q6prm_send_cmd_sync(prm, pkt, rsp_opcode);
+
+	kfree(pkt);
+
+	return rc;
+}
+
+static int q6prm_set_lpass_clock(struct device *dev, int clk_id, int clk_attr,
+				 int clk_root, unsigned int freq)
+{
+	struct prm_cmd_request_rsc *req;
+	struct apm_module_param_data *param_data;
+	struct gpr_pkt *pkt;
+	struct q6prm *prm = dev_get_drvdata(dev);
+	gpr_device_t *gdev  = prm->gdev;
+	void *p;
+	int rc = 0;
+
+	p = audioreach_alloc_cmd_pkt(sizeof(*req), PRM_CMD_REQUEST_HW_RSC,
+				     0, gdev->svc.id, GPR_PRM_MODULE_IID);
+	if (IS_ERR(p))
+		return -ENOMEM;
+
+	pkt = p;
+	req = p + GPR_HDR_SIZE + APM_CMD_HDR_SIZE;
+
+	param_data = &req->param_data;
+
+	param_data->module_instance_id = GPR_PRM_MODULE_IID;
+	param_data->error_code = 0;
+	param_data->param_id = PARAM_ID_RSC_AUDIO_HW_CLK;
+	param_data->param_size = sizeof(*req) - APM_MODULE_PARAM_DATA_SIZE;
+
+	req->num_clk_id = 1;
+	req->clock_ids[0].clock_id = clk_id;
+	req->clock_ids[0].clock_freq = freq;
+	req->clock_ids[0].clock_attri = clk_attr;
+	req->clock_ids[0].clock_root = clk_root;
+
+	q6prm_send_cmd_sync(prm, pkt, PRM_CMD_RSP_REQUEST_HW_RSC);
+
+	kfree(pkt);
+
+	return rc;
+}
+
+static int prm_callback(struct gpr_resp_pkt *data, void *priv, int op)
+{
+	gpr_device_t *gdev = priv;
+	struct q6prm *prm = dev_get_drvdata(&gdev->dev);
+	struct gpr_ibasic_rsp_result_t *result;
+	struct gpr_hdr *hdr = &data->hdr;
+
+	result = data->payload;
+
+	switch (hdr->opcode) {
+	case PRM_CMD_RSP_REQUEST_HW_RSC:
+	case PRM_CMD_RSP_RELEASE_HW_RSC:
+		prm->result.opcode = hdr->opcode;
+		prm->result.status = result->status;
+		wake_up(&prm->wait);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int clk_q6prm_prepare(struct clk_hw *hw)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	return q6prm_set_lpass_clock(clk->dev, clk->afe_clk_id, clk->attributes,
+				     Q6PRM_LPASS_CLK_ROOT_DEFAULT, clk->rate);
+}
+
+static void clk_q6prm_unprepare(struct clk_hw *hw)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	q6prm_set_lpass_clock(clk->dev, clk->afe_clk_id, clk->attributes,
+			      Q6PRM_LPASS_CLK_ROOT_DEFAULT, 0);
+}
+
+static int clk_q6prm_set_rate(struct clk_hw *hw, unsigned long rate,
+			      unsigned long parent_rate)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	clk->rate = rate;
+
+	return 0;
+}
+
+static unsigned long clk_q6prm_recalc_rate(struct clk_hw *hw,
+					   unsigned long parent_rate)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	return clk->rate;
+}
+
+static long clk_q6prm_round_rate(struct clk_hw *hw, unsigned long rate,
+				 unsigned long *parent_rate)
+{
+	return rate;
+}
+
+static const struct clk_ops clk_q6prm_ops = {
+	.prepare	= clk_q6prm_prepare,
+	.unprepare	= clk_q6prm_unprepare,
+	.set_rate	= clk_q6prm_set_rate,
+	.round_rate	= clk_q6prm_round_rate,
+	.recalc_rate	= clk_q6prm_recalc_rate,
+};
+
+static int clk_vote_q6prm_block(struct clk_hw *hw)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	return q6prm_set_hw_core_req(clk->dev, clk->afe_clk_id, true);
+}
+
+static void clk_unvote_q6prm_block(struct clk_hw *hw)
+{
+	struct q6prm_clk *clk = to_q6prm_clk(hw);
+
+	q6prm_set_hw_core_req(clk->dev, clk->afe_clk_id, false);
+}
+
+static const struct clk_ops clk_vote_q6prm_ops = {
+	.prepare	= clk_vote_q6prm_block,
+	.unprepare	= clk_unvote_q6prm_block,
+};
+
+static struct q6prm_clk *q6prm_clks[Q6PRM_MAX_CLK_ID] = {
+	[LPASS_CLK_ID_WSA_CORE_MCLK] = Q6PRM_CLK(LPASS_CLK_ID_WSA_CORE_MCLK),
+	[LPASS_CLK_ID_WSA_CORE_NPL_MCLK] =
+				Q6PRM_CLK(LPASS_CLK_ID_WSA_CORE_NPL_MCLK),
+	[LPASS_CLK_ID_VA_CORE_MCLK] = Q6PRM_CLK(LPASS_CLK_ID_VA_CORE_MCLK),
+	[LPASS_CLK_ID_TX_CORE_MCLK] = Q6PRM_CLK(LPASS_CLK_ID_TX_CORE_MCLK),
+	[LPASS_CLK_ID_TX_CORE_NPL_MCLK] =
+			Q6PRM_CLK(LPASS_CLK_ID_TX_CORE_NPL_MCLK),
+	[LPASS_CLK_ID_RX_CORE_MCLK] = Q6PRM_CLK(LPASS_CLK_ID_RX_CORE_MCLK),
+	[LPASS_CLK_ID_RX_CORE_NPL_MCLK] =
+				Q6PRM_CLK(LPASS_CLK_ID_RX_CORE_NPL_MCLK),
+	[LPASS_CLK_ID_VA_CORE_2X_MCLK] =
+				Q6PRM_CLK(LPASS_CLK_ID_VA_CORE_2X_MCLK),
+	[LPASS_HW_MACRO_VOTE] = Q6PRM_VOTE_CLK(LPASS_HW_MACRO_VOTE,
+						Q6PRM_HW_CORE_ID_LPASS),
+	[LPASS_HW_DCODEC_VOTE] = Q6PRM_VOTE_CLK(LPASS_HW_DCODEC_VOTE,
+						Q6PRM_HW_CORE_ID_DCODEC),
+};
+
+static struct clk_hw *q6prm_of_clk_hw_get(struct of_phandle_args *clkspec,
+					  void *data)
+{
+	struct q6prm *cc = data;
+	unsigned int idx = clkspec->args[0];
+	unsigned int attr = clkspec->args[1];
+
+	if (idx >= cc->num_clks || attr > LPASS_CLK_ATTRIBUTE_COUPLE_DIVISOR) {
+		dev_err(cc->dev, "Invalid clk specifier (%d, %d)\n", idx, attr);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (cc->clks[idx]) {
+		cc->clks[idx]->attributes = attr;
+		return &cc->clks[idx]->hw;
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+
+static int prm_probe(gpr_device_t *gdev)
+{
+	struct device *dev = &gdev->dev;
+	struct q6prm *cc;
+	int i, ret;
+
+	cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
+	if (!cc)
+		return -ENOMEM;
+
+	cc->dev = dev;
+	cc->gdev = gdev;
+	mutex_init(&cc->lock);
+	init_waitqueue_head(&cc->wait);
+	cc->clks = &q6prm_clks[0];
+	cc->num_clks = ARRAY_SIZE(q6prm_clks);
+	for (i = 0; i < ARRAY_SIZE(q6prm_clks); i++) {
+		if (!q6prm_clks[i])
+			continue;
+
+		q6prm_clks[i]->dev = dev;
+
+		ret = devm_clk_hw_register(dev, &q6prm_clks[i]->hw);
+		if (ret)
+			return ret;
+	}
+
+	ret = of_clk_add_hw_provider(dev->of_node, q6prm_of_clk_hw_get, cc);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(dev, cc);
+
+	return 0;
+}
+
+static const struct of_device_id prm_device_id[]  = {
+	{ .compatible = "qcom,q6prm" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, prm_device_id);
+
+static gpr_driver_t prm_driver = {
+	.probe = prm_probe,
+	.gpr_callback = prm_callback,
+	.driver = {
+		.name = "qcom-prm",
+		.of_match_table = of_match_ptr(prm_device_id),
+	},
+};
+
+module_gpr_driver(prm_driver);
+MODULE_DESCRIPTION("Audio Process Manager");
+MODULE_LICENSE("GPL v2");
-- 
2.21.0

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