ASoC: Intel: Introduce AVS driver

Declare base structures and core DSP operations for the avs solution.
The base structures describe PCI HDAudio bus device and platform-type
differentiations. First set of operations added controls the lifecycle
of any Audio DSP core: (un)powering, (un)resetting and (un)stalling.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220311153544.136854-4-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 107 insertions, 0 deletions

diff --git a/sound/soc/intel/avs/dsp.c b/sound/soc/intel/avs/dsp.c
new file mode 100644
index 000000000000..63f5ce2698a2
--- /dev/null
+++ b/sound/soc/intel/avs/dsp.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2021-2022 Intel Corporation. All rights reserved.
+//
+// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
+//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
+//
+
+#include <linux/module.h>
+#include <sound/hdaudio_ext.h>
+#include "avs.h"
+#include "registers.h"
+
+#define AVS_ADSPCS_INTERVAL_US		500
+#define AVS_ADSPCS_TIMEOUT_US		50000
+
+int avs_dsp_core_power(struct avs_dev *adev, u32 core_mask, bool power)
+{
+	u32 value, mask, reg;
+	int ret;
+
+	mask = AVS_ADSPCS_SPA_MASK(core_mask);
+	value = power ? mask : 0;
+
+	snd_hdac_adsp_updatel(adev, AVS_ADSP_REG_ADSPCS, mask, value);
+
+	mask = AVS_ADSPCS_CPA_MASK(core_mask);
+	value = power ? mask : 0;
+
+	ret = snd_hdac_adsp_readl_poll(adev, AVS_ADSP_REG_ADSPCS,
+				       reg, (reg & mask) == value,
+				       AVS_ADSPCS_INTERVAL_US,
+				       AVS_ADSPCS_TIMEOUT_US);
+	if (ret)
+		dev_err(adev->dev, "core_mask %d power %s failed: %d\n",
+			core_mask, power ? "on" : "off", ret);
+
+	return ret;
+}
+
+int avs_dsp_core_reset(struct avs_dev *adev, u32 core_mask, bool reset)
+{
+	u32 value, mask, reg;
+	int ret;
+
+	mask = AVS_ADSPCS_CRST_MASK(core_mask);
+	value = reset ? mask : 0;
+
+	snd_hdac_adsp_updatel(adev, AVS_ADSP_REG_ADSPCS, mask, value);
+
+	ret = snd_hdac_adsp_readl_poll(adev, AVS_ADSP_REG_ADSPCS,
+				       reg, (reg & mask) == value,
+				       AVS_ADSPCS_INTERVAL_US,
+				       AVS_ADSPCS_TIMEOUT_US);
+	if (ret)
+		dev_err(adev->dev, "core_mask %d %s reset failed: %d\n",
+			core_mask, reset ? "enter" : "exit", ret);
+
+	return ret;
+}
+
+int avs_dsp_core_stall(struct avs_dev *adev, u32 core_mask, bool stall)
+{
+	u32 value, mask, reg;
+	int ret;
+
+	mask = AVS_ADSPCS_CSTALL_MASK(core_mask);
+	value = stall ? mask : 0;
+
+	snd_hdac_adsp_updatel(adev, AVS_ADSP_REG_ADSPCS, mask, value);
+
+	ret = snd_hdac_adsp_readl_poll(adev, AVS_ADSP_REG_ADSPCS,
+				       reg, (reg & mask) == value,
+				       AVS_ADSPCS_INTERVAL_US,
+				       AVS_ADSPCS_TIMEOUT_US);
+	if (ret)
+		dev_err(adev->dev, "core_mask %d %sstall failed: %d\n",
+			core_mask, stall ? "" : "un", ret);
+
+	return ret;
+}
+
+int avs_dsp_core_enable(struct avs_dev *adev, u32 core_mask)
+{
+	int ret;
+
+	ret = avs_dsp_op(adev, power, core_mask, true);
+	if (ret)
+		return ret;
+
+	ret = avs_dsp_op(adev, reset, core_mask, false);
+	if (ret)
+		return ret;
+
+	return avs_dsp_op(adev, stall, core_mask, false);
+}
+
+int avs_dsp_core_disable(struct avs_dev *adev, u32 core_mask)
+{
+	/* No error checks to allow for complete DSP shutdown. */
+	avs_dsp_op(adev, stall, core_mask, true);
+	avs_dsp_op(adev, reset, core_mask, true);
+
+	return avs_dsp_op(adev, power, core_mask, false);
+}
+
+MODULE_LICENSE("GPL");