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Message-ID: <0381c4f0-1588-45a6-9742-d291a5d18c0f@amd.com>
Date: Wed, 25 Dec 2024 11:30:21 +0530
From: "Mukunda,Vijendar" <vijendar.mukunda@....com>
To: Mario Limonciello <mario.limonciello@....com>, broonie@...nel.org
Cc: alsa-devel@...a-project.org, lgirdwood@...il.com, perex@...ex.cz,
tiwai@...e.com, Basavaraj.Hiregoudar@....com, Sunil-kumar.Dommati@....com,
venkataprasad.potturu@....com, linux-sound@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/21] ASoC: amd: acp70: add acp pci driver for ACP7.0 and
ACP7.1 platforms
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@....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@....com");
>> +MODULE_DESCRIPTION("AMD ACP7.0 PCI driver");
>> +MODULE_LICENSE("GPL");
>
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