// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license. When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2022 Advanced Micro Devices, Inc. All rights reserved.
//
// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>

/*
 * Generic PCI interface for ACP device
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>

#include "amd.h"
#include "../mach-config.h"

#define DRV_NAME "acp_pci"

#define ACP3x_REG_START 0x1240000
#define ACP3x_REG_END   0x125C000

static irqreturn_t irq_handler(int irq, void *data)
{
        struct acp_chip_info *chip = data;

        if (chip && chip->acp_hw_ops && chip->acp_hw_ops->irq)
                return chip->acp_hw_ops->irq(irq, chip);

        return IRQ_NONE;
}
static void acp_fill_platform_dev_info(struct platform_device_info *pdevinfo,
                                       struct device *parent,
                                       struct fwnode_handle *fw_node,
                                       char *name, unsigned int id,
                                       const struct resource *res,
                                       unsigned int num_res,
                                       const void *data,
                                       size_t size_data)
{
        pdevinfo->name = name;
        pdevinfo->id = id;
        pdevinfo->parent = parent;
        pdevinfo->num_res = num_res;
        pdevinfo->res = res;
        pdevinfo->data = data;
        pdevinfo->size_data = size_data;
        pdevinfo->fwnode = fw_node;
}

static int create_acp_platform_devs(struct pci_dev *pci, struct acp_chip_info *chip, u32 addr)
{
        struct platform_device_info pdevinfo;
        struct device *parent;
        int ret;

        parent = &pci->dev;

        if (chip->is_i2s_config || chip->is_pdm_dev) {
                chip->res = devm_kzalloc(&pci->dev, sizeof(struct resource), GFP_KERNEL);
                if (!chip->res) {
                        ret = -ENOMEM;
                        goto err;
                }
                chip->res->flags = IORESOURCE_MEM;
                chip->res->start = addr;
                chip->res->end = addr + (ACP3x_REG_END - ACP3x_REG_START);
                memset(&pdevinfo, 0, sizeof(pdevinfo));
        }

        memset(&pdevinfo, 0, sizeof(pdevinfo));
        acp_fill_platform_dev_info(&pdevinfo, parent, NULL, chip->name,
                                   0, chip->res, 1, chip, sizeof(*chip));

        chip->acp_plat_dev = platform_device_register_full(&pdevinfo);
        if (IS_ERR(chip->acp_plat_dev)) {
                dev_err(&pci->dev,
                        "cannot register %s device\n", pdevinfo.name);
                ret = PTR_ERR(chip->acp_plat_dev);
                goto err;
        }
        if (chip->is_pdm_dev && chip->is_pdm_config) {
                chip->dmic_codec_dev = platform_device_register_data(&pci->dev,
                                                                     "dmic-codec",
                                                                     PLATFORM_DEVID_NONE,
                                                                     NULL, 0);
                if (IS_ERR(chip->dmic_codec_dev)) {
                        dev_err(&pci->dev, "failed to create DMIC device\n");
                        ret = PTR_ERR(chip->dmic_codec_dev);
                        goto unregister_acp_plat_dev;
                }
        }
        return 0;
unregister_acp_plat_dev:
        platform_device_unregister(chip->acp_plat_dev);
err:
        return ret;
}

static int acp_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
{
        struct device *dev = &pci->dev;
        struct acp_chip_info *chip;
        unsigned int flag, addr;
        int ret;

        flag = snd_amd_acp_find_config(pci);
        if (flag != FLAG_AMD_LEGACY && flag != FLAG_AMD_LEGACY_ONLY_DMIC)
                return -ENODEV;

        chip = devm_kzalloc(&pci->dev, sizeof(*chip), GFP_KERNEL);
        if (!chip)
                return -ENOMEM;

        if (pci_enable_device(pci))
                return dev_err_probe(&pci->dev, -ENODEV,
                                     "pci_enable_device failed\n");

        ret = pci_request_regions(pci, "AMD ACP3x audio");
        if (ret < 0) {
                dev_err(&pci->dev, "pci_request_regions failed\n");
                ret = -ENOMEM;
                goto disable_pci;
        }

        pci_set_master(pci);

        chip->acp_rev = pci->revision;
        switch (pci->revision) {
        case 0x01:
                chip->name = "acp_asoc_renoir";
                chip->rsrc = &rn_rsrc;
                chip->acp_hw_ops_init = acp31_hw_ops_init;
                chip->machines = snd_soc_acpi_amd_acp_machines;
                break;
        case 0x6f:
                chip->name = "acp_asoc_rembrandt";
                chip->rsrc = &rmb_rsrc;
                chip->acp_hw_ops_init = acp6x_hw_ops_init;
                chip->machines = snd_soc_acpi_amd_rmb_acp_machines;
                break;
        case 0x63:
                chip->name = "acp_asoc_acp63";
                chip->rsrc = &acp63_rsrc;
                chip->acp_hw_ops_init = acp63_hw_ops_init;
                chip->machines = snd_soc_acpi_amd_acp63_acp_machines;
                break;
        case 0x70:
        case 0x71:
        case 0x72:
                chip->name = "acp_asoc_acp70";
                chip->rsrc = &acp70_rsrc;
                chip->acp_hw_ops_init = acp70_hw_ops_init;
                chip->machines = snd_soc_acpi_amd_acp70_acp_machines;
                break;
        default:
                dev_err(dev, "Unsupported device revision:0x%x\n", pci->revision);
                ret = -EINVAL;
                goto release_regions;
        }
        chip->flag = flag;

        addr = pci_resource_start(pci, 0);
        chip->base = devm_ioremap(&pci->dev, addr, pci_resource_len(pci, 0));
        if (!chip->base) {
                ret = -ENOMEM;
                goto release_regions;
        }

        chip->addr = addr;

        chip->acp_hw_ops_init(chip);
        ret = acp_hw_init(chip);
        if (ret)
                goto release_regions;

        ret = devm_request_irq(dev, pci->irq, irq_handler,
                               IRQF_SHARED, "ACP_I2S_IRQ", chip);
        if (ret) {
                dev_err(&pci->dev, "ACP I2S IRQ request failed %d\n", ret);
                goto de_init;
        }

        check_acp_config(pci, chip);
        if (!chip->is_pdm_dev && !chip->is_i2s_config)
                goto skip_pdev_creation;

        ret = create_acp_platform_devs(pci, chip, addr);
        if (ret < 0) {
                dev_err(&pci->dev, "ACP platform devices creation failed\n");
                goto de_init;
        }

        chip->chip_pdev = chip->acp_plat_dev;
        chip->dev = &chip->acp_plat_dev->dev;

        acp_machine_select(chip);

        INIT_LIST_HEAD(&chip->stream_list);
        spin_lock_init(&chip->acp_lock);
skip_pdev_creation:
        dev_set_drvdata(&pci->dev, chip);
        pm_runtime_set_autosuspend_delay(&pci->dev, 2000);
        pm_runtime_use_autosuspend(&pci->dev);
        pm_runtime_put_noidle(&pci->dev);
        pm_runtime_allow(&pci->dev);
        return ret;

de_init:
        acp_hw_deinit(chip);
release_regions:
        pci_release_regions(pci);
disable_pci:
        pci_disable_device(pci);

        return ret;
};

static int snd_acp_suspend(struct device *dev)
{
        struct acp_chip_info *chip;
        int ret;

        chip = dev_get_drvdata(dev);
        ret = acp_hw_deinit(chip);
        if (ret)
                dev_err(dev, "ACP de-init failed\n");
        return ret;
}

static int snd_acp_resume(struct device *dev)
{
        struct acp_chip_info *chip;
        int ret;

        chip = dev_get_drvdata(dev);
        ret = acp_hw_init(chip);
        if (ret)
                dev_err(dev, "ACP init failed\n");

        ret = acp_hw_en_interrupts(chip);
        if (ret)
                dev_err(dev, "ACP en-interrupts failed\n");

        return ret;
}

static const struct dev_pm_ops acp_pm_ops = {
        RUNTIME_PM_OPS(snd_acp_suspend, snd_acp_resume, NULL)
        SYSTEM_SLEEP_PM_OPS(snd_acp_suspend, snd_acp_resume)
};

static void acp_pci_remove(struct pci_dev *pci)
{
        struct acp_chip_info *chip;
        int ret;

        chip = pci_get_drvdata(pci);
        pm_runtime_forbid(&pci->dev);
        pm_runtime_get_noresume(&pci->dev);
        if (chip->dmic_codec_dev)
                platform_device_unregister(chip->dmic_codec_dev);
        if (chip->acp_plat_dev)
                platform_device_unregister(chip->acp_plat_dev);
        if (chip->mach_dev)
                platform_device_unregister(chip->mach_dev);

        ret = acp_hw_deinit(chip);
        if (ret)
                dev_err(&pci->dev, "ACP de-init failed\n");
}

/* PCI IDs */
static const struct pci_device_id acp_pci_ids[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_PCI_DEV_ID)},
        { 0, }
};
MODULE_DEVICE_TABLE(pci, acp_pci_ids);

/* pci_driver definition */
static struct pci_driver snd_amd_acp_pci_driver = {
        .name = KBUILD_MODNAME,
        .id_table = acp_pci_ids,
        .probe = acp_pci_probe,
        .remove = acp_pci_remove,
        .driver = {
                .pm = pm_ptr(&acp_pm_ops),
        },
};
module_pci_driver(snd_amd_acp_pci_driver);

MODULE_DESCRIPTION("AMD ACP common PCI support");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_IMPORT_NS("SND_SOC_ACP_COMMON");
MODULE_ALIAS(DRV_NAME);