Re: [PATCH 02/21] ASoC: amd: acp70: add acp pci driver for ACP7.0 and ACP7.1 platforms

["Mukunda,Vijendar" <vijendar.mukunda@amd.com>]

On 19/12/24 22:53, Mario Limonciello wrote:
> On 12/18/2024 23:48, Vijendar Mukunda wrote:
>> ACP is a PCI audio device.
>> This patch adds common PCI driver to bind to this device and get PCI
>> resources for ACP7.0 & ACP7.1 platforms.
>>
>> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
>> ---
>>   sound/soc/amd/acp70/acp70.h     |  33 +++++++++++
>>   sound/soc/amd/acp70/pci-acp70.c | 100 ++++++++++++++++++++++++++++++++
>>   2 files changed, 133 insertions(+)
>>   create mode 100644 sound/soc/amd/acp70/acp70.h
>>   create mode 100644 sound/soc/amd/acp70/pci-acp70.c
>>
>> diff --git a/sound/soc/amd/acp70/acp70.h b/sound/soc/amd/acp70/acp70.h
>> new file mode 100644
>> index 000000000000..28a46f0c2026
>> --- /dev/null
>> +++ b/sound/soc/amd/acp70/acp70.h
>> @@ -0,0 +1,33 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * ACP 7.0 platform Common header file
>> + *
>> + * Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
>> + */
>> +
>> +#include <sound/acp70_chip_offset_byte.h>
>> +
>> +#define ACP_DEVICE_ID        0x15E2
>> +#define ACP70_REG_START        0x1240000
>> +#define ACP70_REG_END        0x125C000
>> +#define ACP70_PCI_REV        0x70
>> +#define ACP71_PCI_REV        0x71
>> +
>> +/**
>> + * struct acp70_dev_data - acp pci driver context
>> + * @acp70_base: acp mmio base
>> + * @acp_lock: used to protect acp common registers
>> + * @addr: pci ioremap address
>> + * @reg_range: ACP reigister range
>> + * @acp_rev : ACP PCI revision id
>> + */
>> +
>> +struct acp70_dev_data {
>> +    void __iomem *acp70_base;
>> +    struct mutex acp_lock; /* protect shared registers */
>> +    u32 addr;
>> +    u32 reg_range;
>> +    u32 acp_rev;
>> +};
>> +
>> +int snd_amd_acp_find_config(struct pci_dev *pci);
>> diff --git a/sound/soc/amd/acp70/pci-acp70.c b/sound/soc/amd/acp70/pci-acp70.c
>> new file mode 100644
>> index 000000000000..23e47f619bd7
>> --- /dev/null
>> +++ b/sound/soc/amd/acp70/pci-acp70.c
>> @@ -0,0 +1,100 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * AMD common ACP PCI driver for ACP7.0 & ACP7.1 platforms
>> + *
>> + * Copyright 2024 Advanced Micro Devices, Inc.
>> + */
>> +
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/pci.h>
>> +#include "../mach-config.h"
>> +
>> +#include "acp70.h"
>> +
>> +static int snd_acp70_probe(struct pci_dev *pci,
>> +               const struct pci_device_id *pci_id)
>> +{
>> +    struct acp70_dev_data *adata;
>> +    u32 addr, flag;
>> +    int ret;
>> +
>> +    /* Return if acp config flag is defined */
>> +    flag = snd_amd_acp_find_config(pci);
>> +    if (flag)
>> +        return -ENODEV;
>> +
>> +    /* Pink Sardine device check */
>> +    switch (pci->revision) {
>> +    case ACP70_PCI_REV:
>> +    case ACP71_PCI_REV:
>> +        break;
>> +    default:
>> +        dev_dbg(&pci->dev, "acp70 pci device not found\n");
>> +        return -ENODEV;
>> +    }
>> +    if (pci_enable_device(pci)) {
>> +        dev_err(&pci->dev, "pci_enable_device failed\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    ret = pci_request_regions(pci, "AMD ACP6.2 audio");
>
> Presumably this should be "ACP7.x audio"
will fix it.
>
>> +    if (ret < 0) {
>> +        dev_err(&pci->dev, "pci_request_regions failed\n");
>> +        goto disable_pci;
>> +    }
>> +    adata = devm_kzalloc(&pci->dev, sizeof(struct acp70_dev_data),
>> +                 GFP_KERNEL);
>> +    if (!adata) {
>> +        ret = -ENOMEM;
>> +        goto release_regions;
>> +    }
>> +
>> +    addr = pci_resource_start(pci, 0);
>> +    adata->acp70_base = devm_ioremap(&pci->dev, addr,
>> +                     pci_resource_len(pci, 0));
>> +    if (!adata->acp70_base) {
>> +        ret = -ENOMEM;
>> +        goto release_regions;
>> +    }
>> +    adata->addr = addr;
>> +    adata->reg_range = ACP70_REG_END - ACP70_REG_START;
>> +    adata->acp_rev = pci->revision;
>> +    pci_set_master(pci);
>> +    pci_set_drvdata(pci, adata);
>> +    mutex_init(&adata->acp_lock);
>> +    return 0;
>> +release_regions:
>> +    pci_release_regions(pci);
>> +disable_pci:
>> +    pci_disable_device(pci);
>> +
>> +    return ret;
>> +}
>> +
>> +static void snd_acp70_remove(struct pci_dev *pci)
>> +{
>> +    pci_release_regions(pci);
>> +    pci_disable_device(pci);
>> +}
>> +
>> +static const struct pci_device_id snd_acp70_ids[] = {
>> +    { PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
>
> Do you still need to specify the device ID since you already have a class
> entry in this table below?
As per our understanding, If another driver uses the same class, in that case we
need Device ID
entries for platform distinguish. I think it's still good to go with current
implementation.
>
>> +    .class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
>> +    .class_mask = 0xffffff },
>> +    { 0, },
>> +};
>> +MODULE_DEVICE_TABLE(pci, snd_acp70_ids);
>> +
>> +static struct pci_driver ps_acp70_driver  = {
>> +    .name = KBUILD_MODNAME,
>> +    .id_table = snd_acp70_ids,
>> +    .probe = snd_acp70_probe,
>> +    .remove = snd_acp70_remove,
>> +};
>> +
>> +module_pci_driver(ps_acp70_driver);
>> +
>> +MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
>> +MODULE_DESCRIPTION("AMD ACP7.0 PCI driver");
>> +MODULE_LICENSE("GPL");
>