/*
 * wm_adsp.c  --  Wolfson ADSP support
 *
 * Copyright 2012 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/jack.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include <linux/mfd/arizona/registers.h>

#include "wm_adsp.h"

#define adsp_crit(_dsp, fmt, ...) \
	dev_crit(_dsp->dev, "DSP%d: " fmt, _dsp->num, ##__VA_ARGS__)
#define adsp_err(_dsp, fmt, ...) \
	dev_err(_dsp->dev, "DSP%d: " fmt, _dsp->num, ##__VA_ARGS__)
#define adsp_warn(_dsp, fmt, ...) \
	dev_warn(_dsp->dev, "DSP%d: " fmt, _dsp->num, ##__VA_ARGS__)
#define adsp_info(_dsp, fmt, ...) \
	dev_info(_dsp->dev, "DSP%d: " fmt, _dsp->num, ##__VA_ARGS__)
#define adsp_dbg(_dsp, fmt, ...) \
	dev_dbg(_dsp->dev, "DSP%d: " fmt, _dsp->num, ##__VA_ARGS__)

#define ADSP1_CONTROL_1                   0x00
#define ADSP1_CONTROL_2                   0x02
#define ADSP1_CONTROL_3                   0x03
#define ADSP1_CONTROL_4                   0x04
#define ADSP1_CONTROL_5                   0x06
#define ADSP1_CONTROL_6                   0x07
#define ADSP1_CONTROL_7                   0x08
#define ADSP1_CONTROL_8                   0x09
#define ADSP1_CONTROL_9                   0x0A
#define ADSP1_CONTROL_10                  0x0B
#define ADSP1_CONTROL_11                  0x0C
#define ADSP1_CONTROL_12                  0x0D
#define ADSP1_CONTROL_13                  0x0F
#define ADSP1_CONTROL_14                  0x10
#define ADSP1_CONTROL_15                  0x11
#define ADSP1_CONTROL_16                  0x12
#define ADSP1_CONTROL_17                  0x13
#define ADSP1_CONTROL_18                  0x14
#define ADSP1_CONTROL_19                  0x16
#define ADSP1_CONTROL_20                  0x17
#define ADSP1_CONTROL_21                  0x18
#define ADSP1_CONTROL_22                  0x1A
#define ADSP1_CONTROL_23                  0x1B
#define ADSP1_CONTROL_24                  0x1C
#define ADSP1_CONTROL_25                  0x1E
#define ADSP1_CONTROL_26                  0x20
#define ADSP1_CONTROL_27                  0x21
#define ADSP1_CONTROL_28                  0x22
#define ADSP1_CONTROL_29                  0x23
#define ADSP1_CONTROL_30                  0x24
#define ADSP1_CONTROL_31                  0x26

/*
 * ADSP1 Control 19
 */
#define ADSP1_WDMA_BUFFER_LENGTH_MASK     0x00FF  /* DSP1_WDMA_BUFFER_LENGTH - [7:0] */
#define ADSP1_WDMA_BUFFER_LENGTH_SHIFT         0  /* DSP1_WDMA_BUFFER_LENGTH - [7:0] */
#define ADSP1_WDMA_BUFFER_LENGTH_WIDTH         8  /* DSP1_WDMA_BUFFER_LENGTH - [7:0] */


/*
 * ADSP1 Control 30
 */
#define ADSP1_DBG_CLK_ENA                 0x0008  /* DSP1_DBG_CLK_ENA */
#define ADSP1_DBG_CLK_ENA_MASK            0x0008  /* DSP1_DBG_CLK_ENA */
#define ADSP1_DBG_CLK_ENA_SHIFT                3  /* DSP1_DBG_CLK_ENA */
#define ADSP1_DBG_CLK_ENA_WIDTH                1  /* DSP1_DBG_CLK_ENA */
#define ADSP1_SYS_ENA                     0x0004  /* DSP1_SYS_ENA */
#define ADSP1_SYS_ENA_MASK                0x0004  /* DSP1_SYS_ENA */
#define ADSP1_SYS_ENA_SHIFT                    2  /* DSP1_SYS_ENA */
#define ADSP1_SYS_ENA_WIDTH                    1  /* DSP1_SYS_ENA */
#define ADSP1_CORE_ENA                    0x0002  /* DSP1_CORE_ENA */
#define ADSP1_CORE_ENA_MASK               0x0002  /* DSP1_CORE_ENA */
#define ADSP1_CORE_ENA_SHIFT                   1  /* DSP1_CORE_ENA */
#define ADSP1_CORE_ENA_WIDTH                   1  /* DSP1_CORE_ENA */
#define ADSP1_START                       0x0001  /* DSP1_START */
#define ADSP1_START_MASK                  0x0001  /* DSP1_START */
#define ADSP1_START_SHIFT                      0  /* DSP1_START */
#define ADSP1_START_WIDTH                      1  /* DSP1_START */

#define ADSP2_CONTROL  0
#define ADSP2_CLOCKING 1
#define ADSP2_STATUS1  4

/*
 * ADSP2 Control
 */

#define ADSP2_MEM_ENA                     0x0010  /* DSP1_MEM_ENA */
#define ADSP2_MEM_ENA_MASK                0x0010  /* DSP1_MEM_ENA */
#define ADSP2_MEM_ENA_SHIFT                    4  /* DSP1_MEM_ENA */
#define ADSP2_MEM_ENA_WIDTH                    1  /* DSP1_MEM_ENA */
#define ADSP2_SYS_ENA                     0x0004  /* DSP1_SYS_ENA */
#define ADSP2_SYS_ENA_MASK                0x0004  /* DSP1_SYS_ENA */
#define ADSP2_SYS_ENA_SHIFT                    2  /* DSP1_SYS_ENA */
#define ADSP2_SYS_ENA_WIDTH                    1  /* DSP1_SYS_ENA */
#define ADSP2_CORE_ENA                    0x0002  /* DSP1_CORE_ENA */
#define ADSP2_CORE_ENA_MASK               0x0002  /* DSP1_CORE_ENA */
#define ADSP2_CORE_ENA_SHIFT                   1  /* DSP1_CORE_ENA */
#define ADSP2_CORE_ENA_WIDTH                   1  /* DSP1_CORE_ENA */
#define ADSP2_START                       0x0001  /* DSP1_START */
#define ADSP2_START_MASK                  0x0001  /* DSP1_START */
#define ADSP2_START_SHIFT                      0  /* DSP1_START */
#define ADSP2_START_WIDTH                      1  /* DSP1_START */

/*
 * ADSP2 clocking
 */
#define ADSP2_CLK_SEL_MASK                0x0007  /* CLK_SEL_ENA */
#define ADSP2_CLK_SEL_SHIFT                    0  /* CLK_SEL_ENA */
#define ADSP2_CLK_SEL_WIDTH                    3  /* CLK_SEL_ENA */

/*
 * ADSP2 Status 1
 */
#define ADSP2_RAM_RDY                     0x0001
#define ADSP2_RAM_RDY_MASK                0x0001
#define ADSP2_RAM_RDY_SHIFT                    0
#define ADSP2_RAM_RDY_WIDTH                    1


static struct wm_adsp_region const *wm_adsp_find_region(struct wm_adsp *dsp,
							int type)
{
	int i;

	for (i = 0; i < dsp->num_mems; i++)
		if (dsp->mem[i].type == type)
			return &dsp->mem[i];

	return NULL;
}

static int wm_adsp_load(struct wm_adsp *dsp)
{
	const struct firmware *firmware;
	struct regmap *regmap = dsp->regmap;
	unsigned int pos = 0;
	const struct wmfw_header *header;
	const struct wmfw_adsp1_sizes *adsp1_sizes;
	const struct wmfw_adsp2_sizes *adsp2_sizes;
	const struct wmfw_footer *footer;
	const struct wmfw_region *region;
	const struct wm_adsp_region *mem;
	const char *region_name;
	char *file, *text;
	unsigned int reg;
	int regions = 0;
	int ret, offset, type, sizes;

	file = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (file == NULL)
		return -ENOMEM;

	snprintf(file, PAGE_SIZE, "%s-dsp%d.wmfw", dsp->part, dsp->num);
	file[PAGE_SIZE - 1] = '\0';

	ret = request_firmware(&firmware, file, dsp->dev);
	if (ret != 0) {
		adsp_err(dsp, "Failed to request '%s'\n", file);
		goto out;
	}
	ret = -EINVAL;

	pos = sizeof(*header) + sizeof(*adsp1_sizes) + sizeof(*footer);
	if (pos >= firmware->size) {
		adsp_err(dsp, "%s: file too short, %zu bytes\n",
			 file, firmware->size);
		goto out_fw;
	}

	header = (void*)&firmware->data[0];

	if (memcmp(&header->magic[0], "WMFW", 4) != 0) {
		adsp_err(dsp, "%s: invalid magic\n", file);
		goto out_fw;
	}

	if (header->ver != 0) {
		adsp_err(dsp, "%s: unknown file format %d\n",
			 file, header->ver);
		goto out_fw;
	}

	if (header->core != dsp->type) {
		adsp_err(dsp, "%s: invalid core %d != %d\n",
			 file, header->core, dsp->type);
		goto out_fw;
	}

	switch (dsp->type) {
	case WMFW_ADSP1:
		pos = sizeof(*header) + sizeof(*adsp1_sizes) + sizeof(*footer);
		adsp1_sizes = (void *)&(header[1]);
		footer = (void *)&(adsp1_sizes[1]);
		sizes = sizeof(*adsp1_sizes);

		adsp_dbg(dsp, "%s: %d DM, %d PM, %d ZM\n",
			 file, le32_to_cpu(adsp1_sizes->dm),
			 le32_to_cpu(adsp1_sizes->pm),
			 le32_to_cpu(adsp1_sizes->zm));
		break;

	case WMFW_ADSP2:
		pos = sizeof(*header) + sizeof(*adsp2_sizes) + sizeof(*footer);
		adsp2_sizes = (void *)&(header[1]);
		footer = (void *)&(adsp2_sizes[1]);
		sizes = sizeof(*adsp2_sizes);

		adsp_dbg(dsp, "%s: %d XM, %d YM %d PM, %d ZM\n",
			 file, le32_to_cpu(adsp2_sizes->xm),
			 le32_to_cpu(adsp2_sizes->ym),
			 le32_to_cpu(adsp2_sizes->pm),
			 le32_to_cpu(adsp2_sizes->zm));
		break;

	default:
		BUG_ON(NULL == "Unknown DSP type");
		goto out_fw;
	}

	if (le32_to_cpu(header->len) != sizeof(*header) +
	    sizes + sizeof(*footer)) {
		adsp_err(dsp, "%s: unexpected header length %d\n",
			 file, le32_to_cpu(header->len));
		goto out_fw;
	}

	adsp_dbg(dsp, "%s: timestamp %llu\n", file,
		 le64_to_cpu(footer->timestamp));

	while (pos < firmware->size &&
	       pos - firmware->size > sizeof(*region)) {
		region = (void *)&(firmware->data[pos]);
		region_name = "Unknown";
		reg = 0;
		text = NULL;
		offset = le32_to_cpu(region->offset) & 0xffffff;
		type = be32_to_cpu(region->type) & 0xff;
		mem = wm_adsp_find_region(dsp, type);
		
		switch (type) {
		case WMFW_NAME_TEXT:
			region_name = "Firmware name";
			text = kzalloc(le32_to_cpu(region->len) + 1,
				       GFP_KERNEL);
			break;
		case WMFW_INFO_TEXT:
			region_name = "Information";
			text = kzalloc(le32_to_cpu(region->len) + 1,
				       GFP_KERNEL);
			break;
		case WMFW_ABSOLUTE:
			region_name = "Absolute";
			reg = offset;
			break;
		case WMFW_ADSP1_PM:
			BUG_ON(!mem);
			region_name = "PM";
			reg = mem->base + (offset * 3);
			break;
		case WMFW_ADSP1_DM:
			BUG_ON(!mem);
			region_name = "DM";
			reg = mem->base + (offset * 2);
			break;
		case WMFW_ADSP2_XM:
			BUG_ON(!mem);
			region_name = "XM";
			reg = mem->base + (offset * 2);
			break;
		case WMFW_ADSP2_YM:
			BUG_ON(!mem);
			region_name = "YM";
			reg = mem->base + (offset * 2);
			break;
		case WMFW_ADSP1_ZM:
			BUG_ON(!mem);
			region_name = "ZM";
			reg = mem->base + (offset * 2);
			break;
		default:
			adsp_warn(dsp,
				  "%s.%d: Unknown region type %x at %d(%x)\n",
				  file, regions, type, pos, pos);
			break;
		}

		adsp_dbg(dsp, "%s.%d: %d bytes at %d in %s\n", file,
			 regions, le32_to_cpu(region->len), offset,
			 region_name);

		if (text) {
			memcpy(text, region->data, le32_to_cpu(region->len));
			adsp_info(dsp, "%s: %s\n", file, text);
			kfree(text);
		}

		if (reg) {
			ret = regmap_raw_write(regmap, reg, region->data,
					       le32_to_cpu(region->len));
			if (ret != 0) {
				adsp_err(dsp,
					"%s.%d: Failed to write %d bytes at %d in %s: %d\n",
					file, regions,
					le32_to_cpu(region->len), offset,
					region_name, ret);
				goto out_fw;
			}
		}

		pos += le32_to_cpu(region->len) + sizeof(*region);
		regions++;
	}
	
	if (pos > firmware->size)
		adsp_warn(dsp, "%s.%d: %zu bytes at end of file\n",
			  file, regions, pos - firmware->size);

out_fw:
	release_firmware(firmware);
out:
	kfree(file);

	return ret;
}

static int wm_adsp_load_coeff(struct wm_adsp *dsp)
{
	struct regmap *regmap = dsp->regmap;
	struct wmfw_coeff_hdr *hdr;
	struct wmfw_coeff_item *blk;
	const struct firmware *firmware;
	const char *region_name;
	int ret, pos, blocks, type, offset, reg;
	char *file;

	file = kzalloc(PAGE_SIZE, GFP_KERNEL);
	if (file == NULL)
		return -ENOMEM;

	snprintf(file, PAGE_SIZE, "%s-dsp%d.bin", dsp->part, dsp->num);
	file[PAGE_SIZE - 1] = '\0';

	ret = request_firmware(&firmware, file, dsp->dev);
	if (ret != 0) {
		adsp_warn(dsp, "Failed to request '%s'\n", file);
		ret = 0;
		goto out;
	}
	ret = -EINVAL;

	if (sizeof(*hdr) >= firmware->size) {
		adsp_err(dsp, "%s: file too short, %zu bytes\n",
			file, firmware->size);
		goto out_fw;
	}

	hdr = (void*)&firmware->data[0];
	if (memcmp(hdr->magic, "WMDR", 4) != 0) {
		adsp_err(dsp, "%s: invalid magic\n", file);
		return -EINVAL;
	}

	adsp_dbg(dsp, "%s: v%d.%d.%d\n", file,
		(le32_to_cpu(hdr->ver) >> 16) & 0xff,
		(le32_to_cpu(hdr->ver) >>  8) & 0xff,
		le32_to_cpu(hdr->ver) & 0xff);

	pos = le32_to_cpu(hdr->len);

	blocks = 0;
	while (pos < firmware->size &&
	       pos - firmware->size > sizeof(*blk)) {
		blk = (void*)(&firmware->data[pos]);

		type = be32_to_cpu(blk->type) & 0xff;
		offset = le32_to_cpu(blk->offset) & 0xffffff;

		adsp_dbg(dsp, "%s.%d: %x v%d.%d.%d\n",
			 file, blocks, le32_to_cpu(blk->id),
			 (le32_to_cpu(blk->ver) >> 16) & 0xff,
			 (le32_to_cpu(blk->ver) >>  8) & 0xff,
			 le32_to_cpu(blk->ver) & 0xff);
		adsp_dbg(dsp, "%s.%d: %d bytes at 0x%x in %x\n",
			 file, blocks, le32_to_cpu(blk->len), offset, type);

		reg = 0;
		region_name = "Unknown";
		switch (type) {
		case WMFW_NAME_TEXT:
		case WMFW_INFO_TEXT:
			break;
		case WMFW_ABSOLUTE:
			region_name = "register";
			reg = offset;
			break;
		default:
			adsp_err(dsp, "Unknown region type %x\n", type);
			break;
		}

		if (reg) {
			ret = regmap_raw_write(regmap, reg, blk->data,
					       le32_to_cpu(blk->len));
			if (ret != 0) {
				adsp_err(dsp,
					"%s.%d: Failed to write to %x in %s\n",
					file, blocks, reg, region_name);
			}
		}

		pos += le32_to_cpu(blk->len) + sizeof(*blk);
		blocks++;
	}

	if (pos > firmware->size)
		adsp_warn(dsp, "%s.%d: %zu bytes at end of file\n",
			  file, blocks, pos - firmware->size);

out_fw:
	release_firmware(firmware);
out:
	kfree(file);
	return 0;
}

int wm_adsp1_event(struct snd_soc_dapm_widget *w,
		   struct snd_kcontrol *kcontrol,
		   int event)
{
	struct snd_soc_codec *codec = w->codec;
	struct wm_adsp *dsps = snd_soc_codec_get_drvdata(codec);
	struct wm_adsp *dsp = &dsps[w->shift];
	int ret;

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_30,
				   ADSP1_SYS_ENA, ADSP1_SYS_ENA);

		ret = wm_adsp_load(dsp);
		if (ret != 0)
			goto err;

		ret = wm_adsp_load_coeff(dsp);
		if (ret != 0)
			goto err;

		/* Start the core running */
		regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_30,
				   ADSP1_CORE_ENA | ADSP1_START,
				   ADSP1_CORE_ENA | ADSP1_START);
		break;

	case SND_SOC_DAPM_PRE_PMD:
		/* Halt the core */
		regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_30,
				   ADSP1_CORE_ENA | ADSP1_START, 0);

		regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_19,
				   ADSP1_WDMA_BUFFER_LENGTH_MASK, 0);

		regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_30,
				   ADSP1_SYS_ENA, 0);
		break;

	default:
		break;
	}

	return 0;

err:
	regmap_update_bits(dsp->regmap, dsp->base + ADSP1_CONTROL_30,
			   ADSP1_SYS_ENA, 0);
	return ret;
}
EXPORT_SYMBOL_GPL(wm_adsp1_event);

static int wm_adsp2_ena(struct wm_adsp *dsp)
{
	unsigned int val;
	int ret, count;

	ret = regmap_update_bits(dsp->regmap, dsp->base + ADSP2_CONTROL,
				 ADSP2_SYS_ENA, ADSP2_SYS_ENA);
	if (ret != 0)
		return ret;

	/* Wait for the RAM to start, should be near instantaneous */
	count = 0;
	do {
		ret = regmap_read(dsp->regmap, dsp->base + ADSP2_STATUS1,
				  &val);
		if (ret != 0)
			return ret;
	} while (!(val & ADSP2_RAM_RDY) && ++count < 10);

	if (!(val & ADSP2_RAM_RDY)) {
		adsp_err(dsp, "Failed to start DSP RAM\n");
		return -EBUSY;
	}

	adsp_dbg(dsp, "RAM ready after %d polls\n", count);
	adsp_info(dsp, "RAM ready after %d polls\n", count);

	return 0;
}

int wm_adsp2_event(struct snd_soc_dapm_widget *w,
		   struct snd_kcontrol *kcontrol, int event)
{
	struct snd_soc_codec *codec = w->codec;
	struct wm_adsp *dsps = snd_soc_codec_get_drvdata(codec);
	struct wm_adsp *dsp = &dsps[w->shift];
	unsigned int val;
	int ret;

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		/*
		 * For simplicity set the DSP clock rate to be the
		 * SYSCLK rate rather than making it configurable.
		 */
		ret = regmap_read(dsp->regmap, ARIZONA_SYSTEM_CLOCK_1, &val);
		if (ret != 0) {
			adsp_err(dsp, "Failed to read SYSCLK state: %d\n",
				 ret);
			return ret;
		}
		val = (val & ARIZONA_SYSCLK_FREQ_MASK)
			>> ARIZONA_SYSCLK_FREQ_SHIFT;

		ret = regmap_update_bits(dsp->regmap,
					 dsp->base + ADSP2_CLOCKING,
					 ADSP2_CLK_SEL_MASK, val);
		if (ret != 0) {
			adsp_err(dsp, "Failed to set clock rate: %d\n",
				 ret);
			return ret;
		}

		if (dsp->dvfs) {
			ret = regmap_read(dsp->regmap,
					  dsp->base + ADSP2_CLOCKING, &val);
			if (ret != 0) {
				dev_err(dsp->dev,
					"Failed to read clocking: %d\n", ret);
				return ret;
			}

			if ((val & ADSP2_CLK_SEL_MASK) >= 3) {
				ret = regulator_enable(dsp->dvfs);
				if (ret != 0) {
					dev_err(dsp->dev,
						"Failed to enable supply: %d\n",
						ret);
					return ret;
				}

				ret = regulator_set_voltage(dsp->dvfs,
							    1800000,
							    1800000);
				if (ret != 0) {
					dev_err(dsp->dev,
						"Failed to raise supply: %d\n",
						ret);
					return ret;
				}
			}
		}

		ret = wm_adsp2_ena(dsp);
		if (ret != 0)
			return ret;

		ret = wm_adsp_load(dsp);
		if (ret != 0)
			goto err;

		ret = wm_adsp_load_coeff(dsp);
		if (ret != 0)
			goto err;

		ret = regmap_update_bits(dsp->regmap,
					 dsp->base + ADSP2_CONTROL,
					 ADSP2_CORE_ENA | ADSP2_START,
					 ADSP2_CORE_ENA | ADSP2_START);
		if (ret != 0)
			goto err;
		break;

	case SND_SOC_DAPM_PRE_PMD:
		regmap_update_bits(dsp->regmap, dsp->base + ADSP2_CONTROL,
				   ADSP2_SYS_ENA | ADSP2_CORE_ENA |
				   ADSP2_START, 0);

		if (dsp->dvfs) {
			ret = regulator_set_voltage(dsp->dvfs, 1200000,
						    1800000);
			if (ret != 0)
				dev_warn(dsp->dev,
					 "Failed to lower supply: %d\n",
					 ret);

			ret = regulator_disable(dsp->dvfs);
			if (ret != 0)
				dev_err(dsp->dev,
					"Failed to enable supply: %d\n",
					ret);
		}
		break;

	default:
		break;
	}

	return 0;
err:
	regmap_update_bits(dsp->regmap, dsp->base + ADSP2_CONTROL,
			   ADSP2_SYS_ENA | ADSP2_CORE_ENA | ADSP2_START, 0);
	return ret;
}
EXPORT_SYMBOL_GPL(wm_adsp2_event);

int wm_adsp2_init(struct wm_adsp *adsp, bool dvfs)
{
	int ret;

	/*
	 * Disable the DSP memory by default when in reset for a small
	 * power saving.
	 */
	ret = regmap_update_bits(adsp->regmap, adsp->base + ADSP2_CONTROL,
				 ADSP2_MEM_ENA, 0);
	if (ret != 0) {
		adsp_err(adsp, "Failed to clear memory retention: %d\n", ret);
		return ret;
	}

	if (dvfs) {
		adsp->dvfs = devm_regulator_get(adsp->dev, "DCVDD");
		if (IS_ERR(adsp->dvfs)) {
			ret = PTR_ERR(adsp->dvfs);
			dev_err(adsp->dev, "Failed to get DCVDD: %d\n", ret);
			return ret;
		}

		ret = regulator_enable(adsp->dvfs);
		if (ret != 0) {
			dev_err(adsp->dev, "Failed to enable DCVDD: %d\n",
				ret);
			return ret;
		}

		ret = regulator_set_voltage(adsp->dvfs, 1200000, 1800000);
		if (ret != 0) {
			dev_err(adsp->dev, "Failed to initialise DVFS: %d\n",
				ret);
			return ret;
		}

		ret = regulator_disable(adsp->dvfs);
		if (ret != 0) {
			dev_err(adsp->dev, "Failed to disable DCVDD: %d\n",
				ret);
			return ret;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(wm_adsp2_init);