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// SPDX-License-Identifier: GPL-2.0
// Copyright 2020 NXP
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/imx_mic_epf.h>
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/pm_domain.h>
#include "imx_mic_boot.h"
#include "../common/imx_mic_common.h"
static struct imx_mic_intr *g_mintr;
void imx_mic_intr_enable(struct imx_mic_driver *mdrv, int index)
{
struct imx_mic_intr *mintr = mdrv->mintr;
u32 val;
val = readl(mintr->base + MIC_INTR_MU_CR);
val |= MIC_INTR_MU_ACR_GIEn(index);
writel(val, mintr->base + MIC_INTR_MU_CR);
}
EXPORT_SYMBOL_GPL(imx_mic_intr_enable);
void imx_mic_intr_disable(struct imx_mic_driver *mdrv, int index)
{
struct imx_mic_intr *mintr = mdrv->mintr;
u32 val;
val = readl(mintr->base + MIC_INTR_MU_CR);
val &= ~MIC_INTR_MU_ACR_GIEn(index);
writel(val, mintr->base + MIC_INTR_MU_CR);
}
EXPORT_SYMBOL_GPL(imx_mic_intr_disable);
void imx_mic_intr_ack(struct imx_mic_driver *mdrv, int index)
{
struct imx_mic_intr *mintr = mdrv->mintr;
u32 val;
val = readl(mintr->base + MIC_INTR_MU_SR);
/* clear interrupt: W1C*/
val |= MIC_INTR_MU_ASR_GIPn(index);
writel(val, mintr->base + MIC_INTR_MU_SR);
}
EXPORT_SYMBOL_GPL(imx_mic_intr_ack);
static irqreturn_t imx_mic_intr_handler(int irq, void *dev_id)
{
struct imx_mic_intr *mintr = dev_id;
u32 val;
val = readl(mintr->base + MIC_INTR_MU_SR);
if (val & MIC_INTR_MU_ASR_GIPn(MIC_CONFIG_DB))
return mintr->config_intr(irq, mintr->config_intr_priv);
else if (val & MIC_INTR_MU_ASR_GIPn(MIC_DATA_DB))
return mintr->data_intr(irq, mintr->data_intr_priv);
else {
dev_err(mintr->dev, "invalid mu channel index\n");
return IRQ_NONE;
}
}
int imx_mic_intr_init(struct imx_mic_driver *mdrv)
{
int ret, irq;
mdrv->mintr = g_mintr;
irq = mdrv->mintr->irq;
ret = request_irq(irq, imx_mic_intr_handler, IRQF_SHARED,
mdrv->name, mdrv->mintr);
if (ret) {
dev_err(mdrv->dev, "Failed to request irq handler\n");
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(imx_mic_intr_init);
void imx_mic_intr_uninit(struct imx_mic_driver *mdrv)
{
int irq;
mdrv->mintr = g_mintr;
irq = mdrv->mintr->irq;
free_irq(irq, mdrv);
}
EXPORT_SYMBOL_GPL(imx_mic_intr_uninit);
void imx_mic_get_doorbell_info(u32 *doorbell_reg_base, u32 *doorbell_reg_size)
{
struct imx_mic_intr *mintr = g_mintr;
*doorbell_reg_base = mintr->doorbell_reg_base;
*doorbell_reg_size = mintr->doorbell_reg_size;
}
EXPORT_SYMBOL_GPL(imx_mic_get_doorbell_info);
static int parse_doorbell_info(struct imx_mic_intr *mintr)
{
struct device_node *np = mintr->dev->of_node;
int ret;
u32 val;
ret = of_property_read_u32_index(np, "doorbell-reg", 0, &val);
if (ret) {
dev_err(mintr->dev, "can't get doorbell-reg address\n");
return ret;
}
mintr->doorbell_reg_base = val;
ret = of_property_read_u32_index(np, "doorbell-reg", 1, &val);
if (ret) {
dev_err(mintr->dev, "can't get doorbell-reg size\n");
return ret;
}
mintr->doorbell_reg_size = val;
return 0;
}
static int imx_mic_intr_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_link *link;
struct imx_mic_intr *intr;
int ret;
intr = devm_kzalloc(dev, sizeof(*intr), GFP_KERNEL);;
if (!intr)
return -ENOMEM;
intr->dev = dev;
g_mintr = intr;
intr->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(intr->base))
return PTR_ERR(intr->base);
intr->irq = platform_get_irq(pdev, 0);
if (intr->irq < 0)
return intr->irq;
intr->clk_aside = devm_clk_get(dev, "clk_a");
if (IS_ERR(intr->clk_aside)) {
if (PTR_ERR(intr->clk_aside) != -ENOENT)
return PTR_ERR(intr->clk_aside);
intr->clk_aside = NULL;
}
intr->clk_bside = devm_clk_get(dev, "clk_b");
if (IS_ERR(intr->clk_bside)) {
if (PTR_ERR(intr->clk_bside) != -ENOENT)
return PTR_ERR(intr->clk_bside);
intr->clk_bside = NULL;
}
ret = clk_prepare_enable(intr->clk_aside);
if (ret) {
dev_err(dev, "Failed to enable clk_a clock\n");
return ret;
}
ret = clk_prepare_enable(intr->clk_bside);
if (ret) {
dev_err(dev, "Failed to enable clk_b clock\n");
return ret;
}
intr->pd_aside = dev_pm_domain_attach_by_name(dev, "pd_a");
if (IS_ERR(intr->pd_aside)) {
if (PTR_ERR(intr->pd_aside) != -ENOENT)
return PTR_ERR(intr->pd_aside);
intr->pd_aside = NULL;
}
link = device_link_add(dev, intr->pd_aside,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (IS_ERR(link)) {
dev_err(dev, "Failed to add device_link to pd_a: %ld\n", PTR_ERR(link));
return PTR_ERR(link);
}
intr->pd_bside = dev_pm_domain_attach_by_name(dev, "pd_b");
if (IS_ERR(intr->pd_bside)) {
if (PTR_ERR(intr->pd_bside) != -ENOENT)
return PTR_ERR(intr->pd_bside);
intr->pd_bside = NULL;
}
link = device_link_add(dev, intr->pd_bside,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (IS_ERR(link)) {
dev_err(dev, "Failed to add device_link to pd_b: %ld\n", PTR_ERR(link));
return PTR_ERR(link);
}
parse_doorbell_info(intr);
platform_set_drvdata(pdev, intr);
return 0;
}
static int imx_mic_intr_remove(struct platform_device *pdev)
{
struct imx_mic_intr *intr = platform_get_drvdata(pdev);
clk_disable_unprepare(intr->clk_aside);
clk_disable_unprepare(intr->clk_bside);
return 0;
}
static const struct of_device_id imx_mic_intr_dt_ids[] = {
{ .compatible = "fsl,imx-mic-intr" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_mic_intr_dt_ids);
static struct platform_driver imx_mic_intr_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "imx-mic-intr",
.of_match_table = imx_mic_intr_dt_ids,
},
.probe = imx_mic_intr_probe,
.remove = imx_mic_intr_remove,
};
module_platform_driver(imx_mic_intr_driver);
MODULE_AUTHOR("NXP Corporation");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("i.MX MIC Interrupt based on MU");
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