blob: b943e59fc302437580b14f45febe569819892d44 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
//
// AMD Renoir ACP PCI Driver
//
//Copyright 2020 Advanced Micro Devices, Inc.
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include "rn_acp3x.h"
static int acp_power_gating;
module_param(acp_power_gating, int, 0644);
MODULE_PARM_DESC(acp_power_gating, "Enable acp power gating");
/**
* dmic_acpi_check = -1 - Checks ACPI method to know DMIC hardware status runtime
* = 0 - Skips the DMIC device creation and returns probe failure
* = 1 - Assumes that platform has DMIC support and skips ACPI
* method check
*/
static int dmic_acpi_check = ACP_DMIC_AUTO;
module_param(dmic_acpi_check, bint, 0644);
MODULE_PARM_DESC(dmic_acpi_check, "checks Dmic hardware runtime");
struct acp_dev_data {
void __iomem *acp_base;
struct resource *res;
struct platform_device *pdev[ACP_DEVS];
};
static int rn_acp_power_on(void __iomem *acp_base)
{
u32 val;
int timeout;
val = rn_readl(acp_base + ACP_PGFSM_STATUS);
if (val == 0)
return val;
if ((val & ACP_PGFSM_STATUS_MASK) !=
ACP_POWER_ON_IN_PROGRESS)
rn_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
acp_base + ACP_PGFSM_CONTROL);
timeout = 0;
while (++timeout < 500) {
val = rn_readl(acp_base + ACP_PGFSM_STATUS);
if (!val)
return 0;
udelay(1);
}
return -ETIMEDOUT;
}
static int rn_acp_power_off(void __iomem *acp_base)
{
u32 val;
int timeout;
rn_writel(ACP_PGFSM_CNTL_POWER_OFF_MASK,
acp_base + ACP_PGFSM_CONTROL);
timeout = 0;
while (++timeout < 500) {
val = rn_readl(acp_base + ACP_PGFSM_STATUS);
if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_OFF)
return 0;
udelay(1);
}
return -ETIMEDOUT;
}
static int rn_acp_reset(void __iomem *acp_base)
{
u32 val;
int timeout;
rn_writel(1, acp_base + ACP_SOFT_RESET);
timeout = 0;
while (++timeout < 500) {
val = rn_readl(acp_base + ACP_SOFT_RESET);
if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
break;
cpu_relax();
}
rn_writel(0, acp_base + ACP_SOFT_RESET);
timeout = 0;
while (++timeout < 500) {
val = rn_readl(acp_base + ACP_SOFT_RESET);
if (!val)
return 0;
cpu_relax();
}
return -ETIMEDOUT;
}
static void rn_acp_enable_interrupts(void __iomem *acp_base)
{
u32 ext_intr_ctrl;
rn_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);
ext_intr_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
ext_intr_ctrl |= ACP_ERROR_MASK;
rn_writel(ext_intr_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
}
static void rn_acp_disable_interrupts(void __iomem *acp_base)
{
rn_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base +
ACP_EXTERNAL_INTR_STAT);
rn_writel(0x00, acp_base + ACP_EXTERNAL_INTR_ENB);
}
static int rn_acp_init(void __iomem *acp_base)
{
int ret;
/* power on */
ret = rn_acp_power_on(acp_base);
if (ret) {
pr_err("ACP power on failed\n");
return ret;
}
rn_writel(0x01, acp_base + ACP_CONTROL);
/* Reset */
ret = rn_acp_reset(acp_base);
if (ret) {
pr_err("ACP reset failed\n");
return ret;
}
rn_writel(0x03, acp_base + ACP_CLKMUX_SEL);
rn_acp_enable_interrupts(acp_base);
return 0;
}
static int rn_acp_deinit(void __iomem *acp_base)
{
int ret;
rn_acp_disable_interrupts(acp_base);
/* Reset */
ret = rn_acp_reset(acp_base);
if (ret) {
pr_err("ACP reset failed\n");
return ret;
}
rn_writel(0x00, acp_base + ACP_CLKMUX_SEL);
rn_writel(0x00, acp_base + ACP_CONTROL);
/* power off */
if (acp_power_gating) {
ret = rn_acp_power_off(acp_base);
if (ret) {
pr_err("ACP power off failed\n");
return ret;
}
}
return 0;
}
static int snd_rn_acp_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
struct acp_dev_data *adata;
struct platform_device_info pdevinfo[ACP_DEVS];
#if defined(CONFIG_ACPI)
acpi_handle handle;
acpi_integer dmic_status;
#endif
unsigned int irqflags;
int ret, index;
u32 addr;
if (pci_enable_device(pci)) {
dev_err(&pci->dev, "pci_enable_device failed\n");
return -ENODEV;
}
ret = pci_request_regions(pci, "AMD ACP3x audio");
if (ret < 0) {
dev_err(&pci->dev, "pci_request_regions failed\n");
goto disable_pci;
}
adata = devm_kzalloc(&pci->dev, sizeof(struct acp_dev_data),
GFP_KERNEL);
if (!adata) {
ret = -ENOMEM;
goto release_regions;
}
/* check for msi interrupt support */
ret = pci_enable_msi(pci);
if (ret)
/* msi is not enabled */
irqflags = IRQF_SHARED;
else
/* msi is enabled */
irqflags = 0;
addr = pci_resource_start(pci, 0);
adata->acp_base = devm_ioremap(&pci->dev, addr,
pci_resource_len(pci, 0));
if (!adata->acp_base) {
ret = -ENOMEM;
goto disable_msi;
}
pci_set_master(pci);
pci_set_drvdata(pci, adata);
ret = rn_acp_init(adata->acp_base);
if (ret)
goto disable_msi;
if (!dmic_acpi_check) {
ret = -ENODEV;
goto de_init;
} else if (dmic_acpi_check == ACP_DMIC_AUTO) {
#if defined(CONFIG_ACPI)
handle = ACPI_HANDLE(&pci->dev);
ret = acpi_evaluate_integer(handle, "_WOV", NULL, &dmic_status);
if (ACPI_FAILURE(ret)) {
ret = -EINVAL;
goto de_init;
}
if (!dmic_status) {
ret = -ENODEV;
goto de_init;
}
#endif
}
adata->res = devm_kzalloc(&pci->dev,
sizeof(struct resource) * 2,
GFP_KERNEL);
if (!adata->res) {
ret = -ENOMEM;
goto de_init;
}
adata->res[0].name = "acp_pdm_iomem";
adata->res[0].flags = IORESOURCE_MEM;
adata->res[0].start = addr;
adata->res[0].end = addr + (ACP_REG_END - ACP_REG_START);
adata->res[1].name = "acp_pdm_irq";
adata->res[1].flags = IORESOURCE_IRQ;
adata->res[1].start = pci->irq;
adata->res[1].end = pci->irq;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo[0].name = "acp_rn_pdm_dma";
pdevinfo[0].id = 0;
pdevinfo[0].parent = &pci->dev;
pdevinfo[0].num_res = 2;
pdevinfo[0].res = adata->res;
pdevinfo[0].data = &irqflags;
pdevinfo[0].size_data = sizeof(irqflags);
pdevinfo[1].name = "dmic-codec";
pdevinfo[1].id = 0;
pdevinfo[1].parent = &pci->dev;
pdevinfo[2].name = "acp_pdm_mach";
pdevinfo[2].id = 0;
pdevinfo[2].parent = &pci->dev;
for (index = 0; index < ACP_DEVS; index++) {
adata->pdev[index] =
platform_device_register_full(&pdevinfo[index]);
if (IS_ERR(adata->pdev[index])) {
dev_err(&pci->dev, "cannot register %s device\n",
pdevinfo[index].name);
ret = PTR_ERR(adata->pdev[index]);
goto unregister_devs;
}
}
pm_runtime_set_autosuspend_delay(&pci->dev, ACP_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pci->dev);
pm_runtime_put_noidle(&pci->dev);
pm_runtime_allow(&pci->dev);
return 0;
unregister_devs:
for (index = 0; index < ACP_DEVS; index++)
platform_device_unregister(adata->pdev[index]);
de_init:
if (rn_acp_deinit(adata->acp_base))
dev_err(&pci->dev, "ACP de-init failed\n");
disable_msi:
pci_disable_msi(pci);
release_regions:
pci_release_regions(pci);
disable_pci:
pci_disable_device(pci);
return ret;
}
static int snd_rn_acp_suspend(struct device *dev)
{
int ret;
struct acp_dev_data *adata;
adata = dev_get_drvdata(dev);
ret = rn_acp_deinit(adata->acp_base);
if (ret)
dev_err(dev, "ACP de-init failed\n");
else
dev_dbg(dev, "ACP de-initialized\n");
return ret;
}
static int snd_rn_acp_resume(struct device *dev)
{
int ret;
struct acp_dev_data *adata;
adata = dev_get_drvdata(dev);
ret = rn_acp_init(adata->acp_base);
if (ret) {
dev_err(dev, "ACP init failed\n");
return ret;
}
return 0;
}
static const struct dev_pm_ops rn_acp_pm = {
.runtime_suspend = snd_rn_acp_suspend,
.runtime_resume = snd_rn_acp_resume,
.suspend = snd_rn_acp_suspend,
.resume = snd_rn_acp_resume,
};
static void snd_rn_acp_remove(struct pci_dev *pci)
{
struct acp_dev_data *adata;
int ret, index;
adata = pci_get_drvdata(pci);
for (index = 0; index < ACP_DEVS; index++)
platform_device_unregister(adata->pdev[index]);
ret = rn_acp_deinit(adata->acp_base);
if (ret)
dev_err(&pci->dev, "ACP de-init failed\n");
pm_runtime_forbid(&pci->dev);
pm_runtime_get_noresume(&pci->dev);
pci_disable_msi(pci);
pci_release_regions(pci);
pci_disable_device(pci);
}
static const struct pci_device_id snd_rn_acp_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, ACP_DEVICE_ID),
.class = PCI_CLASS_MULTIMEDIA_OTHER << 8,
.class_mask = 0xffffff },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, snd_rn_acp_ids);
static struct pci_driver rn_acp_driver = {
.name = KBUILD_MODNAME,
.id_table = snd_rn_acp_ids,
.probe = snd_rn_acp_probe,
.remove = snd_rn_acp_remove,
.driver = {
.pm = &rn_acp_pm,
}
};
module_pci_driver(rn_acp_driver);
MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
MODULE_DESCRIPTION("AMD ACP Renoir PCI driver");
MODULE_LICENSE("GPL v2");