ASoC: Intel: Add DSP init and boot up functionality for SKL

This patch adds code to enable, disable and boot DSP core.
Also provide some helpers to reset and power up/down the core.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 337 insertions, 0 deletions

diff --git a/sound/soc/intel/skylake/skl-sst-dsp.c b/sound/soc/intel/skylake/skl-sst-dsp.c
new file mode 100644
index 000000000000..313ca7c6ca7f
--- /dev/null
+++ b/sound/soc/intel/skylake/skl-sst-dsp.c
@@ -0,0 +1,337 @@
+/*
+ * skl-sst-dsp.c - SKL SST library generic function
+ *
+ * Copyright (C) 2014-15, Intel Corporation.
+ * Author:Rafal Redzimski <rafal.f.redzimski@intel.com>
+ *	Jeeja KP <jeeja.kp@intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#include <sound/pcm.h>
+
+#include "../common/sst-dsp.h"
+#include "../common/sst-ipc.h"
+#include "../common/sst-dsp-priv.h"
+#include "skl-sst-ipc.h"
+
+/* various timeout values */
+#define SKL_DSP_PU_TO		50
+#define SKL_DSP_PD_TO		50
+#define SKL_DSP_RESET_TO	50
+
+void skl_dsp_set_state_locked(struct sst_dsp *ctx, int state)
+{
+	mutex_lock(&ctx->mutex);
+	ctx->sst_state = state;
+	mutex_unlock(&ctx->mutex);
+}
+
+static int skl_dsp_core_set_reset_state(struct sst_dsp  *ctx)
+{
+	int ret;
+
+	/* update bits */
+	sst_dsp_shim_update_bits_unlocked(ctx,
+			SKL_ADSP_REG_ADSPCS, SKL_ADSPCS_CRST_MASK,
+			SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK));
+
+	/* poll with timeout to check if operation successful */
+	ret = sst_dsp_register_poll(ctx,
+			SKL_ADSP_REG_ADSPCS,
+			SKL_ADSPCS_CRST_MASK,
+			SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK),
+			SKL_DSP_RESET_TO,
+			"Set reset");
+	if ((sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS) &
+				SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK)) !=
+				SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK)) {
+		dev_err(ctx->dev, "Set reset state failed\n");
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static int skl_dsp_core_unset_reset_state(struct sst_dsp  *ctx)
+{
+	int ret;
+
+	dev_dbg(ctx->dev, "In %s\n", __func__);
+
+	/* update bits */
+	sst_dsp_shim_update_bits_unlocked(ctx, SKL_ADSP_REG_ADSPCS,
+					SKL_ADSPCS_CRST_MASK, 0);
+
+	/* poll with timeout to check if operation successful */
+	ret = sst_dsp_register_poll(ctx,
+			SKL_ADSP_REG_ADSPCS,
+			SKL_ADSPCS_CRST_MASK,
+			0,
+			SKL_DSP_RESET_TO,
+			"Unset reset");
+
+	if ((sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS) &
+				 SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK)) != 0) {
+		dev_err(ctx->dev, "Unset reset state failed\n");
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static bool is_skl_dsp_core_enable(struct sst_dsp  *ctx)
+{
+	int val;
+	bool is_enable;
+
+	val = sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS);
+
+	is_enable = ((val & SKL_ADSPCS_CPA(SKL_DSP_CORES_MASK)) &&
+			(val & SKL_ADSPCS_SPA(SKL_DSP_CORES_MASK)) &&
+			!(val & SKL_ADSPCS_CRST(SKL_DSP_CORES_MASK)) &&
+			!(val & SKL_ADSPCS_CSTALL(SKL_DSP_CORES_MASK)));
+
+	dev_dbg(ctx->dev, "DSP core is enabled=%d\n", is_enable);
+	return is_enable;
+}
+
+static int skl_dsp_reset_core(struct sst_dsp *ctx)
+{
+	/* stall core */
+	sst_dsp_shim_write_unlocked(ctx, SKL_ADSP_REG_ADSPCS,
+			 sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS) &
+				SKL_ADSPCS_CSTALL(SKL_DSP_CORES_MASK));
+
+	/* set reset state */
+	return skl_dsp_core_set_reset_state(ctx);
+}
+
+static int skl_dsp_start_core(struct sst_dsp *ctx)
+{
+	int ret;
+
+	/* unset reset state */
+	ret = skl_dsp_core_unset_reset_state(ctx);
+	if (ret < 0) {
+		dev_dbg(ctx->dev, "dsp unset reset fails\n");
+		return ret;
+	}
+
+	/* run core */
+	dev_dbg(ctx->dev, "run core...\n");
+	sst_dsp_shim_write_unlocked(ctx, SKL_ADSP_REG_ADSPCS,
+			 sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS) &
+				~SKL_ADSPCS_CSTALL(SKL_DSP_CORES_MASK));
+
+	if (!is_skl_dsp_core_enable(ctx)) {
+		skl_dsp_reset_core(ctx);
+		dev_err(ctx->dev, "DSP core enable failed\n");
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static int skl_dsp_core_power_up(struct sst_dsp  *ctx)
+{
+	int ret;
+
+	/* update bits */
+	sst_dsp_shim_update_bits_unlocked(ctx, SKL_ADSP_REG_ADSPCS,
+			SKL_ADSPCS_SPA_MASK, SKL_ADSPCS_SPA(SKL_DSP_CORES_MASK));
+
+	/* poll with timeout to check if operation successful */
+	ret = sst_dsp_register_poll(ctx,
+			SKL_ADSP_REG_ADSPCS,
+			SKL_ADSPCS_CPA_MASK,
+			SKL_ADSPCS_CPA(SKL_DSP_CORES_MASK),
+			SKL_DSP_PU_TO,
+			"Power up");
+
+	if ((sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPCS) &
+			SKL_ADSPCS_CPA(SKL_DSP_CORES_MASK)) !=
+			SKL_ADSPCS_CPA(SKL_DSP_CORES_MASK)) {
+		dev_err(ctx->dev, "DSP core power up failed\n");
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+static int skl_dsp_core_power_down(struct sst_dsp  *ctx)
+{
+	/* update bits */
+	sst_dsp_shim_update_bits_unlocked(ctx, SKL_ADSP_REG_ADSPCS,
+					SKL_ADSPCS_SPA_MASK, 0);
+
+	/* poll with timeout to check if operation successful */
+	return sst_dsp_register_poll(ctx,
+			SKL_ADSP_REG_ADSPCS,
+			SKL_ADSPCS_SPA_MASK,
+			0,
+			SKL_DSP_PD_TO,
+			"Power down");
+}
+
+static int skl_dsp_enable_core(struct sst_dsp  *ctx)
+{
+	int ret;
+
+	/* power up */
+	ret = skl_dsp_core_power_up(ctx);
+	if (ret < 0) {
+		dev_dbg(ctx->dev, "dsp core power up failed\n");
+		return ret;
+	}
+
+	return skl_dsp_start_core(ctx);
+}
+
+int skl_dsp_disable_core(struct sst_dsp  *ctx)
+{
+	int ret;
+
+	ret = skl_dsp_reset_core(ctx);
+	if (ret < 0) {
+		dev_err(ctx->dev, "dsp core reset failed\n");
+		return ret;
+	}
+
+	/* power down core*/
+	ret = skl_dsp_core_power_down(ctx);
+	if (ret < 0) {
+		dev_err(ctx->dev, "dsp core power down failed\n");
+		return ret;
+	}
+
+	if (is_skl_dsp_core_enable(ctx)) {
+		dev_err(ctx->dev, "DSP core disable failed\n");
+		ret = -EIO;
+	}
+
+	return ret;
+}
+
+int skl_dsp_boot(struct sst_dsp *ctx)
+{
+	int ret;
+
+	if (is_skl_dsp_core_enable(ctx)) {
+		dev_dbg(ctx->dev, "dsp core is already enabled, so reset the dap core\n");
+		ret = skl_dsp_reset_core(ctx);
+		if (ret < 0) {
+			dev_err(ctx->dev, "dsp reset failed\n");
+			return ret;
+		}
+
+		ret = skl_dsp_start_core(ctx);
+		if (ret < 0) {
+			dev_err(ctx->dev, "dsp start failed\n");
+			return ret;
+		}
+	} else {
+		dev_dbg(ctx->dev, "disable and enable to make sure DSP is invalid state\n");
+		ret = skl_dsp_disable_core(ctx);
+
+		if (ret < 0) {
+			dev_err(ctx->dev, "dsp disable core failes\n");
+			return ret;
+		}
+		ret = skl_dsp_enable_core(ctx);
+	}
+
+	return ret;
+}
+
+irqreturn_t skl_dsp_sst_interrupt(int irq, void *dev_id)
+{
+	struct sst_dsp *ctx = dev_id;
+	u32 val;
+	irqreturn_t result = IRQ_NONE;
+
+	spin_lock(&ctx->spinlock);
+
+	val = sst_dsp_shim_read_unlocked(ctx, SKL_ADSP_REG_ADSPIS);
+	ctx->intr_status = val;
+
+	if (val & SKL_ADSPIS_IPC) {
+		skl_ipc_int_disable(ctx);
+		result = IRQ_WAKE_THREAD;
+	}
+
+	spin_unlock(&ctx->spinlock);
+
+	return result;
+}
+
+int skl_dsp_wake(struct sst_dsp *ctx)
+{
+	return ctx->fw_ops.set_state_D0(ctx);
+}
+EXPORT_SYMBOL_GPL(skl_dsp_wake);
+
+int skl_dsp_sleep(struct sst_dsp *ctx)
+{
+	return ctx->fw_ops.set_state_D3(ctx);
+}
+EXPORT_SYMBOL_GPL(skl_dsp_sleep);
+
+struct sst_dsp *skl_dsp_ctx_init(struct device *dev,
+		struct sst_dsp_device *sst_dev, int irq)
+{
+	int ret;
+	struct sst_dsp *sst;
+
+	sst = devm_kzalloc(dev, sizeof(*sst), GFP_KERNEL);
+	if (sst == NULL)
+		return NULL;
+
+	spin_lock_init(&sst->spinlock);
+	mutex_init(&sst->mutex);
+	sst->dev = dev;
+	sst->sst_dev = sst_dev;
+	sst->irq = irq;
+	sst->ops = sst_dev->ops;
+	sst->thread_context = sst_dev->thread_context;
+
+	/* Initialise SST Audio DSP */
+	if (sst->ops->init) {
+		ret = sst->ops->init(sst, NULL);
+		if (ret < 0)
+			return NULL;
+	}
+
+	/* Register the ISR */
+	ret = request_threaded_irq(sst->irq, sst->ops->irq_handler,
+		sst_dev->thread, IRQF_SHARED, "AudioDSP", sst);
+	if (ret) {
+		dev_err(sst->dev, "unable to grab threaded IRQ %d, disabling device\n",
+			       sst->irq);
+		return NULL;
+	}
+
+	return sst;
+}
+
+void skl_dsp_free(struct sst_dsp *dsp)
+{
+	skl_ipc_int_disable(dsp);
+
+	free_irq(dsp->irq, dsp);
+	skl_dsp_disable_core(dsp);
+}
+EXPORT_SYMBOL_GPL(skl_dsp_free);
+
+bool is_skl_dsp_running(struct sst_dsp *ctx)
+{
+	return (ctx->sst_state == SKL_DSP_RUNNING);
+}
+EXPORT_SYMBOL_GPL(is_skl_dsp_running);