drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c - kernel/quantenna - Git at Google

 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors: AMD
  *
  */

 #include <linux/irqdomain.h>
 #include <linux/pm_domain.h>
 #include <linux/platform_device.h>
 #include <sound/designware_i2s.h>
 #include <sound/pcm.h>

 #include "amdgpu.h"
 #include "atom.h"
 #include "amdgpu_acp.h"

 #include "acp_gfx_if.h"

 #define ACP_TILE_ON_MASK                0x03
 #define ACP_TILE_OFF_MASK               0x02
 #define ACP_TILE_ON_RETAIN_REG_MASK     0x1f
 #define ACP_TILE_OFF_RETAIN_REG_MASK    0x20

 #define ACP_TILE_P1_MASK                0x3e
 #define ACP_TILE_P2_MASK                0x3d
 #define ACP_TILE_DSP0_MASK              0x3b
 #define ACP_TILE_DSP1_MASK              0x37

 #define ACP_TILE_DSP2_MASK              0x2f

 #define ACP_DMA_REGS_END		0x146c0
 #define ACP_I2S_PLAY_REGS_START		0x14840
 #define ACP_I2S_PLAY_REGS_END		0x148b4
 #define ACP_I2S_CAP_REGS_START		0x148b8
 #define ACP_I2S_CAP_REGS_END		0x1496c

 #define ACP_I2S_COMP1_CAP_REG_OFFSET	0xac
 #define ACP_I2S_COMP2_CAP_REG_OFFSET	0xa8
 #define ACP_I2S_COMP1_PLAY_REG_OFFSET	0x6c
 #define ACP_I2S_COMP2_PLAY_REG_OFFSET	0x68

 #define mmACP_PGFSM_RETAIN_REG		0x51c9
 #define mmACP_PGFSM_CONFIG_REG		0x51ca
 #define mmACP_PGFSM_READ_REG_0		0x51cc

 #define mmACP_MEM_SHUT_DOWN_REQ_LO	0x51f8
 #define mmACP_MEM_SHUT_DOWN_REQ_HI	0x51f9
 #define mmACP_MEM_SHUT_DOWN_STS_LO	0x51fa
 #define mmACP_MEM_SHUT_DOWN_STS_HI	0x51fb

 #define ACP_TIMEOUT_LOOP		0x000000FF
 #define ACP_DEVS			3
 #define ACP_SRC_ID			162

 enum {
 	ACP_TILE_P1 = 0,
 	ACP_TILE_P2,
 	ACP_TILE_DSP0,
 	ACP_TILE_DSP1,
 	ACP_TILE_DSP2,
 };

 static int acp_sw_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

 	adev->acp.parent = adev->dev;

 	adev->acp.cgs_device =
 		amdgpu_cgs_create_device(adev);
 	if (!adev->acp.cgs_device)
 		return -EINVAL;

 	return 0;
 }

 static int acp_sw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

 	if (adev->acp.cgs_device)
 		amdgpu_cgs_destroy_device(adev->acp.cgs_device);

 	return 0;
 }

 /* power off a tile/block within ACP */
 static int acp_suspend_tile(void *cgs_dev, int tile)
 {
 	u32 val = 0;
 	u32 count = 0;

 	if ((tile  < ACP_TILE_P1) || (tile > ACP_TILE_DSP2)) {
 		pr_err("Invalid ACP tile : %d to suspend\n", tile);
 		return -1;
 	}

 	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
 	val &= ACP_TILE_ON_MASK;

 	if (val == 0x0) {
 		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
 		val = val | (1 << tile);
 		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
 		cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
 					0x500 + tile);

 		count = ACP_TIMEOUT_LOOP;
 		while (true) {
 			val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
 								+ tile);
 			val = val & ACP_TILE_ON_MASK;
 			if (val == ACP_TILE_OFF_MASK)
 				break;
 			if (--count == 0) {
 				pr_err("Timeout reading ACP PGFSM status\n");
 				return -ETIMEDOUT;
 			}
 			udelay(100);
 		}

 		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);

 		val |= ACP_TILE_OFF_RETAIN_REG_MASK;
 		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
 	}
 	return 0;
 }

 /* power on a tile/block within ACP */
 static int acp_resume_tile(void *cgs_dev, int tile)
 {
 	u32 val = 0;
 	u32 count = 0;

 	if ((tile  < ACP_TILE_P1) || (tile > ACP_TILE_DSP2)) {
 		pr_err("Invalid ACP tile to resume\n");
 		return -1;
 	}

 	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
 	val = val & ACP_TILE_ON_MASK;

 	if (val != 0x0) {
 		cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
 					0x600 + tile);
 		count = ACP_TIMEOUT_LOOP;
 		while (true) {
 			val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
 							+ tile);
 			val = val & ACP_TILE_ON_MASK;
 			if (val == 0x0)
 				break;
 			if (--count == 0) {
 				pr_err("Timeout reading ACP PGFSM status\n");
 				return -ETIMEDOUT;
 			}
 			udelay(100);
 		}
 		val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
 		if (tile == ACP_TILE_P1)
 			val = val & (ACP_TILE_P1_MASK);
 		else if (tile == ACP_TILE_P2)
 			val = val & (ACP_TILE_P2_MASK);

 		cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
 	}
 	return 0;
 }

 struct acp_pm_domain {
 	void *cgs_dev;
 	struct generic_pm_domain gpd;
 };

 static int acp_poweroff(struct generic_pm_domain *genpd)
 {
 	int i, ret;
 	struct acp_pm_domain *apd;

 	apd = container_of(genpd, struct acp_pm_domain, gpd);
 	if (apd != NULL) {
 		/* Donot return abruptly if any of power tile fails to suspend.
 		 * Log it and continue powering off other tile
 		 */
 		for (i = 4; i >= 0 ; i--) {
 			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
 			if (ret)
 				pr_err("ACP tile %d tile suspend failed\n", i);
 		}
 	}
 	return 0;
 }

 static int acp_poweron(struct generic_pm_domain *genpd)
 {
 	int i, ret;
 	struct acp_pm_domain *apd;

 	apd = container_of(genpd, struct acp_pm_domain, gpd);
 	if (apd != NULL) {
 		for (i = 0; i < 2; i++) {
 			ret = acp_resume_tile(apd->cgs_dev, ACP_TILE_P1 + i);
 			if (ret) {
 				pr_err("ACP tile %d resume failed\n", i);
 				break;
 			}
 		}

 		/* Disable DSPs which are not going to be used */
 		for (i = 0; i < 3; i++) {
 			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_DSP0 + i);
 			/* Continue suspending other DSP, even if one fails */
 			if (ret)
 				pr_err("ACP DSP %d suspend failed\n", i);
 		}
 	}
 	return 0;
 }

 static struct device *get_mfd_cell_dev(const char *device_name, int r)
 {
 	char auto_dev_name[25];
 	struct device *dev;

 	snprintf(auto_dev_name, sizeof(auto_dev_name),
 		 "%s.%d.auto", device_name, r);
 	dev = bus_find_device_by_name(&platform_bus_type, NULL, auto_dev_name);
 	dev_info(dev, "device %s added to pm domain\n", auto_dev_name);

 	return dev;
 }

 /**
  * acp_hw_init - start and test ACP block
  *
  * @adev: amdgpu_device pointer
  *
  */
 static int acp_hw_init(void *handle)
 {
 	int r, i;
 	uint64_t acp_base;
 	struct device *dev;
 	struct i2s_platform_data *i2s_pdata;

 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

 	const struct amdgpu_ip_block_version *ip_version =
 		amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_ACP);

 	if (!ip_version)
 		return -EINVAL;

 	r = amd_acp_hw_init(adev->acp.cgs_device,
 			    ip_version->major, ip_version->minor);
 	/* -ENODEV means board uses AZ rather than ACP */
 	if (r == -ENODEV)
 		return 0;
 	else if (r)
 		return r;

 	r = cgs_get_pci_resource(adev->acp.cgs_device, CGS_RESOURCE_TYPE_MMIO,
 			0x5289, 0, &acp_base);
 	if (r == -ENODEV)
 		return 0;
 	else if (r)
 		return r;

 	adev->acp.acp_genpd = kzalloc(sizeof(struct acp_pm_domain), GFP_KERNEL);
 	if (adev->acp.acp_genpd == NULL)
 		return -ENOMEM;

 	adev->acp.acp_genpd->gpd.name = "ACP_AUDIO";
 	adev->acp.acp_genpd->gpd.power_off = acp_poweroff;
 	adev->acp.acp_genpd->gpd.power_on = acp_poweron;


 	adev->acp.acp_genpd->cgs_dev = adev->acp.cgs_device;

 	pm_genpd_init(&adev->acp.acp_genpd->gpd, NULL, false);

 	adev->acp.acp_cell = kzalloc(sizeof(struct mfd_cell) * ACP_DEVS,
 							GFP_KERNEL);

 	if (adev->acp.acp_cell == NULL)
 		return -ENOMEM;

 	adev->acp.acp_res = kzalloc(sizeof(struct resource) * 4, GFP_KERNEL);

 	if (adev->acp.acp_res == NULL) {
 		kfree(adev->acp.acp_cell);
 		return -ENOMEM;
 	}

 	i2s_pdata = kzalloc(sizeof(struct i2s_platform_data) * 2, GFP_KERNEL);
 	if (i2s_pdata == NULL) {
 		kfree(adev->acp.acp_res);
 		kfree(adev->acp.acp_cell);
 		return -ENOMEM;
 	}

 	i2s_pdata[0].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET;
 	i2s_pdata[0].cap = DWC_I2S_PLAY;
 	i2s_pdata[0].snd_rates = SNDRV_PCM_RATE_8000_96000;
 	i2s_pdata[0].i2s_reg_comp1 = ACP_I2S_COMP1_PLAY_REG_OFFSET;
 	i2s_pdata[0].i2s_reg_comp2 = ACP_I2S_COMP2_PLAY_REG_OFFSET;

 	i2s_pdata[1].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET |
 				DW_I2S_QUIRK_COMP_PARAM1;
 	i2s_pdata[1].cap = DWC_I2S_RECORD;
 	i2s_pdata[1].snd_rates = SNDRV_PCM_RATE_8000_96000;
 	i2s_pdata[1].i2s_reg_comp1 = ACP_I2S_COMP1_CAP_REG_OFFSET;
 	i2s_pdata[1].i2s_reg_comp2 = ACP_I2S_COMP2_CAP_REG_OFFSET;

 	adev->acp.acp_res[0].name = "acp2x_dma";
 	adev->acp.acp_res[0].flags = IORESOURCE_MEM;
 	adev->acp.acp_res[0].start = acp_base;
 	adev->acp.acp_res[0].end = acp_base + ACP_DMA_REGS_END;

 	adev->acp.acp_res[1].name = "acp2x_dw_i2s_play";
 	adev->acp.acp_res[1].flags = IORESOURCE_MEM;
 	adev->acp.acp_res[1].start = acp_base + ACP_I2S_PLAY_REGS_START;
 	adev->acp.acp_res[1].end = acp_base + ACP_I2S_PLAY_REGS_END;

 	adev->acp.acp_res[2].name = "acp2x_dw_i2s_cap";
 	adev->acp.acp_res[2].flags = IORESOURCE_MEM;
 	adev->acp.acp_res[2].start = acp_base + ACP_I2S_CAP_REGS_START;
 	adev->acp.acp_res[2].end = acp_base + ACP_I2S_CAP_REGS_END;

 	adev->acp.acp_res[3].name = "acp2x_dma_irq";
 	adev->acp.acp_res[3].flags = IORESOURCE_IRQ;
 	adev->acp.acp_res[3].start = amdgpu_irq_create_mapping(adev, 162);
 	adev->acp.acp_res[3].end = adev->acp.acp_res[3].start;

 	adev->acp.acp_cell[0].name = "acp_audio_dma";
 	adev->acp.acp_cell[0].num_resources = 4;
 	adev->acp.acp_cell[0].resources = &adev->acp.acp_res[0];

 	adev->acp.acp_cell[1].name = "designware-i2s";
 	adev->acp.acp_cell[1].num_resources = 1;
 	adev->acp.acp_cell[1].resources = &adev->acp.acp_res[1];
 	adev->acp.acp_cell[1].platform_data = &i2s_pdata[0];
 	adev->acp.acp_cell[1].pdata_size = sizeof(struct i2s_platform_data);

 	adev->acp.acp_cell[2].name = "designware-i2s";
 	adev->acp.acp_cell[2].num_resources = 1;
 	adev->acp.acp_cell[2].resources = &adev->acp.acp_res[2];
 	adev->acp.acp_cell[2].platform_data = &i2s_pdata[1];
 	adev->acp.acp_cell[2].pdata_size = sizeof(struct i2s_platform_data);

 	r = mfd_add_hotplug_devices(adev->acp.parent, adev->acp.acp_cell,
 								ACP_DEVS);
 	if (r)
 		return r;

 	for (i = 0; i < ACP_DEVS ; i++) {
 		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
 		r = pm_genpd_add_device(&adev->acp.acp_genpd->gpd, dev);
 		if (r) {
 			dev_err(dev, "Failed to add dev to genpd\n");
 			return r;
 		}
 	}

 	return 0;
 }

 /**
  * acp_hw_fini - stop the hardware block
  *
  * @adev: amdgpu_device pointer
  *
  */
 static int acp_hw_fini(void *handle)
 {
 	int i, ret;
 	struct device *dev;

 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

 	for (i = 0; i < ACP_DEVS ; i++) {
 		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
 		ret = pm_genpd_remove_device(&adev->acp.acp_genpd->gpd, dev);
 		/* If removal fails, dont giveup and try rest */
 		if (ret)
 			dev_err(dev, "remove dev from genpd failed\n");
 	}

 	mfd_remove_devices(adev->acp.parent);
 	kfree(adev->acp.acp_res);
 	kfree(adev->acp.acp_genpd);
 	kfree(adev->acp.acp_cell);

 	return 0;
 }

 static int acp_suspend(void *handle)
 {
 	return 0;
 }

 static int acp_resume(void *handle)
 {
 	int i, ret;
 	struct acp_pm_domain *apd;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;

 	/* return early if no ACP */
 	if (!adev->acp.acp_genpd)
 		return 0;

 	/* SMU block will power on ACP irrespective of ACP runtime status.
 	 * Power off explicitly based on genpd ACP runtime status so that ACP
 	 * hw and ACP-genpd status are in sync.
 	 * 'suspend_power_off' represents "Power status before system suspend"
 	*/
 	if (adev->acp.acp_genpd->gpd.suspend_power_off == true) {
 		apd = container_of(&adev->acp.acp_genpd->gpd,
 					struct acp_pm_domain, gpd);

 		for (i = 4; i >= 0 ; i--) {
 			ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
 			if (ret)
 				pr_err("ACP tile %d tile suspend failed\n", i);
 		}
 	}
 	return 0;
 }

 static int acp_early_init(void *handle)
 {
 	return 0;
 }

 static bool acp_is_idle(void *handle)
 {
 	return true;
 }

 static int acp_wait_for_idle(void *handle)
 {
 	return 0;
 }

 static int acp_soft_reset(void *handle)
 {
 	return 0;
 }

 static int acp_set_clockgating_state(void *handle,
 				     enum amd_clockgating_state state)
 {
 	return 0;
 }

 static int acp_set_powergating_state(void *handle,
 				     enum amd_powergating_state state)
 {
 	return 0;
 }

 const struct amd_ip_funcs acp_ip_funcs = {
 	.name = "acp_ip",
 	.early_init = acp_early_init,
 	.late_init = NULL,
 	.sw_init = acp_sw_init,
 	.sw_fini = acp_sw_fini,
 	.hw_init = acp_hw_init,
 	.hw_fini = acp_hw_fini,
 	.suspend = acp_suspend,
 	.resume = acp_resume,
 	.is_idle = acp_is_idle,
 	.wait_for_idle = acp_wait_for_idle,
 	.soft_reset = acp_soft_reset,
 	.set_clockgating_state = acp_set_clockgating_state,
 	.set_powergating_state = acp_set_powergating_state,
 };
	/*
	* Copyright 2015 Advanced Micro Devices, Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	* Authors: AMD
	*
	*/

	#include <linux/irqdomain.h>
	#include <linux/pm_domain.h>
	#include <linux/platform_device.h>
	#include <sound/designware_i2s.h>
	#include <sound/pcm.h>

	#include "amdgpu.h"
	#include "atom.h"
	#include "amdgpu_acp.h"

	#include "acp_gfx_if.h"

	#define ACP_TILE_ON_MASK 0x03
	#define ACP_TILE_OFF_MASK 0x02
	#define ACP_TILE_ON_RETAIN_REG_MASK 0x1f
	#define ACP_TILE_OFF_RETAIN_REG_MASK 0x20

	#define ACP_TILE_P1_MASK 0x3e
	#define ACP_TILE_P2_MASK 0x3d
	#define ACP_TILE_DSP0_MASK 0x3b
	#define ACP_TILE_DSP1_MASK 0x37

	#define ACP_TILE_DSP2_MASK 0x2f

	#define ACP_DMA_REGS_END 0x146c0
	#define ACP_I2S_PLAY_REGS_START 0x14840
	#define ACP_I2S_PLAY_REGS_END 0x148b4
	#define ACP_I2S_CAP_REGS_START 0x148b8
	#define ACP_I2S_CAP_REGS_END 0x1496c

	#define ACP_I2S_COMP1_CAP_REG_OFFSET 0xac
	#define ACP_I2S_COMP2_CAP_REG_OFFSET 0xa8
	#define ACP_I2S_COMP1_PLAY_REG_OFFSET 0x6c
	#define ACP_I2S_COMP2_PLAY_REG_OFFSET 0x68

	#define mmACP_PGFSM_RETAIN_REG 0x51c9
	#define mmACP_PGFSM_CONFIG_REG 0x51ca
	#define mmACP_PGFSM_READ_REG_0 0x51cc

	#define mmACP_MEM_SHUT_DOWN_REQ_LO 0x51f8
	#define mmACP_MEM_SHUT_DOWN_REQ_HI 0x51f9
	#define mmACP_MEM_SHUT_DOWN_STS_LO 0x51fa
	#define mmACP_MEM_SHUT_DOWN_STS_HI 0x51fb

	#define ACP_TIMEOUT_LOOP 0x000000FF
	#define ACP_DEVS 3
	#define ACP_SRC_ID 162

	enum {
	ACP_TILE_P1 = 0,
	ACP_TILE_P2,
	ACP_TILE_DSP0,
	ACP_TILE_DSP1,
	ACP_TILE_DSP2,
	};

	static int acp_sw_init(void *handle)
	{
	struct amdgpu_device adev = (struct amdgpu_device )handle;

	adev->acp.parent = adev->dev;

	adev->acp.cgs_device =
	amdgpu_cgs_create_device(adev);
	if (!adev->acp.cgs_device)
	return -EINVAL;

	return 0;
	}

	static int acp_sw_fini(void *handle)
	{
	struct amdgpu_device adev = (struct amdgpu_device )handle;

	if (adev->acp.cgs_device)
	amdgpu_cgs_destroy_device(adev->acp.cgs_device);

	return 0;
	}

	/* power off a tile/block within ACP */
	static int acp_suspend_tile(void *cgs_dev, int tile)
	{
	u32 val = 0;
	u32 count = 0;

	if ((tile < ACP_TILE_P1) \|\| (tile > ACP_TILE_DSP2)) {
	pr_err("Invalid ACP tile : %d to suspend\n", tile);
	return -1;
	}

	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
	val &= ACP_TILE_ON_MASK;

	if (val == 0x0) {
	val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
	val = val \| (1 << tile);
	cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
	cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
	0x500 + tile);

	count = ACP_TIMEOUT_LOOP;
	while (true) {
	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
	+ tile);
	val = val & ACP_TILE_ON_MASK;
	if (val == ACP_TILE_OFF_MASK)
	break;
	if (--count == 0) {
	pr_err("Timeout reading ACP PGFSM status\n");
	return -ETIMEDOUT;
	}
	udelay(100);
	}

	val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);

	val \|= ACP_TILE_OFF_RETAIN_REG_MASK;
	cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
	}
	return 0;
	}

	/* power on a tile/block within ACP */
	static int acp_resume_tile(void *cgs_dev, int tile)
	{
	u32 val = 0;
	u32 count = 0;

	if ((tile < ACP_TILE_P1) \|\| (tile > ACP_TILE_DSP2)) {
	pr_err("Invalid ACP tile to resume\n");
	return -1;
	}

	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0 + tile);
	val = val & ACP_TILE_ON_MASK;

	if (val != 0x0) {
	cgs_write_register(cgs_dev, mmACP_PGFSM_CONFIG_REG,
	0x600 + tile);
	count = ACP_TIMEOUT_LOOP;
	while (true) {
	val = cgs_read_register(cgs_dev, mmACP_PGFSM_READ_REG_0
	+ tile);
	val = val & ACP_TILE_ON_MASK;
	if (val == 0x0)
	break;
	if (--count == 0) {
	pr_err("Timeout reading ACP PGFSM status\n");
	return -ETIMEDOUT;
	}
	udelay(100);
	}
	val = cgs_read_register(cgs_dev, mmACP_PGFSM_RETAIN_REG);
	if (tile == ACP_TILE_P1)
	val = val & (ACP_TILE_P1_MASK);
	else if (tile == ACP_TILE_P2)
	val = val & (ACP_TILE_P2_MASK);

	cgs_write_register(cgs_dev, mmACP_PGFSM_RETAIN_REG, val);
	}
	return 0;
	}

	struct acp_pm_domain {
	void *cgs_dev;
	struct generic_pm_domain gpd;
	};

	static int acp_poweroff(struct generic_pm_domain *genpd)
	{
	int i, ret;
	struct acp_pm_domain *apd;

	apd = container_of(genpd, struct acp_pm_domain, gpd);
	if (apd != NULL) {
	/* Donot return abruptly if any of power tile fails to suspend.
	* Log it and continue powering off other tile
	*/
	for (i = 4; i >= 0 ; i--) {
	ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
	if (ret)
	pr_err("ACP tile %d tile suspend failed\n", i);
	}
	}
	return 0;
	}

	static int acp_poweron(struct generic_pm_domain *genpd)
	{
	int i, ret;
	struct acp_pm_domain *apd;

	apd = container_of(genpd, struct acp_pm_domain, gpd);
	if (apd != NULL) {
	for (i = 0; i < 2; i++) {
	ret = acp_resume_tile(apd->cgs_dev, ACP_TILE_P1 + i);
	if (ret) {
	pr_err("ACP tile %d resume failed\n", i);
	break;
	}
	}

	/* Disable DSPs which are not going to be used */
	for (i = 0; i < 3; i++) {
	ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_DSP0 + i);
	/* Continue suspending other DSP, even if one fails */
	if (ret)
	pr_err("ACP DSP %d suspend failed\n", i);
	}
	}
	return 0;
	}

	static struct device get_mfd_cell_dev(const char device_name, int r)
	{
	char auto_dev_name[25];
	struct device *dev;

	snprintf(auto_dev_name, sizeof(auto_dev_name),
	"%s.%d.auto", device_name, r);
	dev = bus_find_device_by_name(&platform_bus_type, NULL, auto_dev_name);
	dev_info(dev, "device %s added to pm domain\n", auto_dev_name);

	return dev;
	}

	/**
	* acp_hw_init - start and test ACP block
	*
	* @adev: amdgpu_device pointer
	*
	*/
	static int acp_hw_init(void *handle)
	{
	int r, i;
	uint64_t acp_base;
	struct device *dev;
	struct i2s_platform_data *i2s_pdata;

	struct amdgpu_device adev = (struct amdgpu_device )handle;

	const struct amdgpu_ip_block_version *ip_version =
	amdgpu_get_ip_block(adev, AMD_IP_BLOCK_TYPE_ACP);

	if (!ip_version)
	return -EINVAL;

	r = amd_acp_hw_init(adev->acp.cgs_device,
	ip_version->major, ip_version->minor);
	/* -ENODEV means board uses AZ rather than ACP */
	if (r == -ENODEV)
	return 0;
	else if (r)
	return r;

	r = cgs_get_pci_resource(adev->acp.cgs_device, CGS_RESOURCE_TYPE_MMIO,
	0x5289, 0, &acp_base);
	if (r == -ENODEV)
	return 0;
	else if (r)
	return r;

	adev->acp.acp_genpd = kzalloc(sizeof(struct acp_pm_domain), GFP_KERNEL);
	if (adev->acp.acp_genpd == NULL)
	return -ENOMEM;

	adev->acp.acp_genpd->gpd.name = "ACP_AUDIO";
	adev->acp.acp_genpd->gpd.power_off = acp_poweroff;
	adev->acp.acp_genpd->gpd.power_on = acp_poweron;


	adev->acp.acp_genpd->cgs_dev = adev->acp.cgs_device;

	pm_genpd_init(&adev->acp.acp_genpd->gpd, NULL, false);

	adev->acp.acp_cell = kzalloc(sizeof(struct mfd_cell) * ACP_DEVS,
	GFP_KERNEL);

	if (adev->acp.acp_cell == NULL)
	return -ENOMEM;

	adev->acp.acp_res = kzalloc(sizeof(struct resource) * 4, GFP_KERNEL);

	if (adev->acp.acp_res == NULL) {
	kfree(adev->acp.acp_cell);
	return -ENOMEM;
	}

	i2s_pdata = kzalloc(sizeof(struct i2s_platform_data) * 2, GFP_KERNEL);
	if (i2s_pdata == NULL) {
	kfree(adev->acp.acp_res);
	kfree(adev->acp.acp_cell);
	return -ENOMEM;
	}

	i2s_pdata[0].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET;
	i2s_pdata[0].cap = DWC_I2S_PLAY;
	i2s_pdata[0].snd_rates = SNDRV_PCM_RATE_8000_96000;
	i2s_pdata[0].i2s_reg_comp1 = ACP_I2S_COMP1_PLAY_REG_OFFSET;
	i2s_pdata[0].i2s_reg_comp2 = ACP_I2S_COMP2_PLAY_REG_OFFSET;

	i2s_pdata[1].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET \|
	DW_I2S_QUIRK_COMP_PARAM1;
	i2s_pdata[1].cap = DWC_I2S_RECORD;
	i2s_pdata[1].snd_rates = SNDRV_PCM_RATE_8000_96000;
	i2s_pdata[1].i2s_reg_comp1 = ACP_I2S_COMP1_CAP_REG_OFFSET;
	i2s_pdata[1].i2s_reg_comp2 = ACP_I2S_COMP2_CAP_REG_OFFSET;

	adev->acp.acp_res[0].name = "acp2x_dma";
	adev->acp.acp_res[0].flags = IORESOURCE_MEM;
	adev->acp.acp_res[0].start = acp_base;
	adev->acp.acp_res[0].end = acp_base + ACP_DMA_REGS_END;

	adev->acp.acp_res[1].name = "acp2x_dw_i2s_play";
	adev->acp.acp_res[1].flags = IORESOURCE_MEM;
	adev->acp.acp_res[1].start = acp_base + ACP_I2S_PLAY_REGS_START;
	adev->acp.acp_res[1].end = acp_base + ACP_I2S_PLAY_REGS_END;

	adev->acp.acp_res[2].name = "acp2x_dw_i2s_cap";
	adev->acp.acp_res[2].flags = IORESOURCE_MEM;
	adev->acp.acp_res[2].start = acp_base + ACP_I2S_CAP_REGS_START;
	adev->acp.acp_res[2].end = acp_base + ACP_I2S_CAP_REGS_END;

	adev->acp.acp_res[3].name = "acp2x_dma_irq";
	adev->acp.acp_res[3].flags = IORESOURCE_IRQ;
	adev->acp.acp_res[3].start = amdgpu_irq_create_mapping(adev, 162);
	adev->acp.acp_res[3].end = adev->acp.acp_res[3].start;

	adev->acp.acp_cell[0].name = "acp_audio_dma";
	adev->acp.acp_cell[0].num_resources = 4;
	adev->acp.acp_cell[0].resources = &adev->acp.acp_res[0];

	adev->acp.acp_cell[1].name = "designware-i2s";
	adev->acp.acp_cell[1].num_resources = 1;
	adev->acp.acp_cell[1].resources = &adev->acp.acp_res[1];
	adev->acp.acp_cell[1].platform_data = &i2s_pdata[0];
	adev->acp.acp_cell[1].pdata_size = sizeof(struct i2s_platform_data);

	adev->acp.acp_cell[2].name = "designware-i2s";
	adev->acp.acp_cell[2].num_resources = 1;
	adev->acp.acp_cell[2].resources = &adev->acp.acp_res[2];
	adev->acp.acp_cell[2].platform_data = &i2s_pdata[1];
	adev->acp.acp_cell[2].pdata_size = sizeof(struct i2s_platform_data);

	r = mfd_add_hotplug_devices(adev->acp.parent, adev->acp.acp_cell,
	ACP_DEVS);
	if (r)
	return r;

	for (i = 0; i < ACP_DEVS ; i++) {
	dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
	r = pm_genpd_add_device(&adev->acp.acp_genpd->gpd, dev);
	if (r) {
	dev_err(dev, "Failed to add dev to genpd\n");
	return r;
	}
	}

	return 0;
	}

	/**
	* acp_hw_fini - stop the hardware block
	*
	* @adev: amdgpu_device pointer
	*
	*/
	static int acp_hw_fini(void *handle)
	{
	int i, ret;
	struct device *dev;

	struct amdgpu_device adev = (struct amdgpu_device )handle;

	for (i = 0; i < ACP_DEVS ; i++) {
	dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
	ret = pm_genpd_remove_device(&adev->acp.acp_genpd->gpd, dev);
	/* If removal fails, dont giveup and try rest */
	if (ret)
	dev_err(dev, "remove dev from genpd failed\n");
	}

	mfd_remove_devices(adev->acp.parent);
	kfree(adev->acp.acp_res);
	kfree(adev->acp.acp_genpd);
	kfree(adev->acp.acp_cell);

	return 0;
	}

	static int acp_suspend(void *handle)
	{
	return 0;
	}

	static int acp_resume(void *handle)
	{
	int i, ret;
	struct acp_pm_domain *apd;
	struct amdgpu_device adev = (struct amdgpu_device )handle;

	/* return early if no ACP */
	if (!adev->acp.acp_genpd)
	return 0;

	/* SMU block will power on ACP irrespective of ACP runtime status.
	* Power off explicitly based on genpd ACP runtime status so that ACP
	* hw and ACP-genpd status are in sync.
	* 'suspend_power_off' represents "Power status before system suspend"
	*/
	if (adev->acp.acp_genpd->gpd.suspend_power_off == true) {
	apd = container_of(&adev->acp.acp_genpd->gpd,
	struct acp_pm_domain, gpd);

	for (i = 4; i >= 0 ; i--) {
	ret = acp_suspend_tile(apd->cgs_dev, ACP_TILE_P1 + i);
	if (ret)
	pr_err("ACP tile %d tile suspend failed\n", i);
	}
	}
	return 0;
	}

	static int acp_early_init(void *handle)
	{
	return 0;
	}

	static bool acp_is_idle(void *handle)
	{
	return true;
	}

	static int acp_wait_for_idle(void *handle)
	{
	return 0;
	}

	static int acp_soft_reset(void *handle)
	{
	return 0;
	}

	static int acp_set_clockgating_state(void *handle,
	enum amd_clockgating_state state)
	{
	return 0;
	}

	static int acp_set_powergating_state(void *handle,
	enum amd_powergating_state state)
	{
	return 0;
	}

	const struct amd_ip_funcs acp_ip_funcs = {
	.name = "acp_ip",
	.early_init = acp_early_init,
	.late_init = NULL,
	.sw_init = acp_sw_init,
	.sw_fini = acp_sw_fini,
	.hw_init = acp_hw_init,
	.hw_fini = acp_hw_fini,
	.suspend = acp_suspend,
	.resume = acp_resume,
	.is_idle = acp_is_idle,
	.wait_for_idle = acp_wait_for_idle,
	.soft_reset = acp_soft_reset,
	.set_clockgating_state = acp_set_clockgating_state,
	.set_powergating_state = acp_set_powergating_state,
	};