// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Broadcom */
#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/kernel.h>
#include <linux/kdebug.h>
#include <linux/gpio/consumer.h>
struct out_pin {
u32 enable_mask;
u32 value_mask;
u32 changed_mask;
u32 clr_changed_mask;
struct gpio_desc *gpiod;
const char *name;
};
struct in_pin {
u32 enable_mask;
u32 value_mask;
struct gpio_desc *gpiod;
const char *name;
struct brcmstb_usb_pinmap_data *pdata;
};
struct brcmstb_usb_pinmap_data {
void __iomem *regs;
int in_count;
struct in_pin *in_pins;
int out_count;
struct out_pin *out_pins;
};
static void pinmap_set(void __iomem *reg, u32 mask)
{
u32 val;
val = readl(reg);
val |= mask;
writel(val, reg);
}
static void pinmap_unset(void __iomem *reg, u32 mask)
{
u32 val;
val = readl(reg);
val &= ~mask;
writel(val, reg);
}
static void sync_in_pin(struct in_pin *pin)
{
u32 val;
val = gpiod_get_value(pin->gpiod);
if (val)
pinmap_set(pin->pdata->regs, pin->value_mask);
else
pinmap_unset(pin->pdata->regs, pin->value_mask);
}
/*
* Interrupt from override register, propagate from override bit
* to GPIO.
*/
static irqreturn_t brcmstb_usb_pinmap_ovr_isr(int irq, void *dev_id)
{
struct brcmstb_usb_pinmap_data *pdata = dev_id;
struct out_pin *pout;
u32 val;
u32 bit;
int x;
pr_debug("%s: reg: 0x%x\n", __func__, readl(pdata->regs));
pout = pdata->out_pins;
for (x = 0; x < pdata->out_count; x++) {
val = readl(pdata->regs);
if (val & pout->changed_mask) {
pinmap_set(pdata->regs, pout->clr_changed_mask);
pinmap_unset(pdata->regs, pout->clr_changed_mask);
bit = val & pout->value_mask;
gpiod_set_value(pout->gpiod, bit ? 1 : 0);
pr_debug("%s: %s bit changed state to %d\n",
__func__, pout->name, bit ? 1 : 0);
}
}
return IRQ_HANDLED;
}
/*
* Interrupt from GPIO, propagate from GPIO to override bit.
*/
static irqreturn_t brcmstb_usb_pinmap_gpio_isr(int irq, void *dev_id)
{
struct in_pin *pin = dev_id;
pr_debug("%s: %s pin changed state\n", __func__, pin->name);
sync_in_pin(pin);
return IRQ_HANDLED;
}
static void get_pin_counts(struct device_node *dn, int *in_count,
int *out_count)
{
int in;
int out;
*in_count = 0;
*out_count = 0;
in = of_property_count_strings(dn, "brcm,in-functions");
if (in < 0)
return;
out = of_property_count_strings(dn, "brcm,out-functions");
if (out < 0)
return;
*in_count = in;
*out_count = out;
}
static int parse_pins(struct device *dev, struct device_node *dn,
struct brcmstb_usb_pinmap_data *pdata)
{
struct out_pin *pout;
struct in_pin *pin;
int index;
int res;
int x;
pin = pdata->in_pins;
for (x = 0, index = 0; x < pdata->in_count; x++) {
pin->gpiod = devm_gpiod_get_index(dev, "in", x, GPIOD_IN);
if (IS_ERR(pin->gpiod)) {
dev_err(dev, "Error getting gpio %s\n", pin->name);
return PTR_ERR(pin->gpiod);
}
res = of_property_read_string_index(dn, "brcm,in-functions", x,
&pin->name);
if (res < 0) {
dev_err(dev, "Error getting brcm,in-functions for %s\n",
pin->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
&pin->enable_mask);
if (res < 0) {
dev_err(dev, "Error getting 1st brcm,in-masks for %s\n",
pin->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,in-masks", index++,
&pin->value_mask);
if (res < 0) {
dev_err(dev, "Error getting 2nd brcm,in-masks for %s\n",
pin->name);
return res;
}
pin->pdata = pdata;
pin++;
}
pout = pdata->out_pins;
for (x = 0, index = 0; x < pdata->out_count; x++) {
pout->gpiod = devm_gpiod_get_index(dev, "out", x,
GPIOD_OUT_HIGH);
if (IS_ERR(pout->gpiod)) {
dev_err(dev, "Error getting gpio %s\n", pin->name);
return PTR_ERR(pout->gpiod);
}
res = of_property_read_string_index(dn, "brcm,out-functions", x,
&pout->name);
if (res < 0) {
dev_err(dev, "Error getting brcm,out-functions for %s\n",
pout->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
&pout->enable_mask);
if (res < 0) {
dev_err(dev, "Error getting 1st brcm,out-masks for %s\n",
pout->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
&pout->value_mask);
if (res < 0) {
dev_err(dev, "Error getting 2nd brcm,out-masks for %s\n",
pout->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
&pout->changed_mask);
if (res < 0) {
dev_err(dev, "Error getting 3rd brcm,out-masks for %s\n",
pout->name);
return res;
}
res = of_property_read_u32_index(dn, "brcm,out-masks", index++,
&pout->clr_changed_mask);
if (res < 0) {
dev_err(dev, "Error getting 4th out-masks for %s\n",
pout->name);
return res;
}
pout++;
}
return 0;
}
static void sync_all_pins(struct brcmstb_usb_pinmap_data *pdata)
{
struct out_pin *pout;
struct in_pin *pin;
int val;
int x;
/*
* Enable the override, clear any changed condition and
* propagate the state to the GPIO for all out pins.
*/
pout = pdata->out_pins;
for (x = 0; x < pdata->out_count; x++) {
pinmap_set(pdata->regs, pout->enable_mask);
pinmap_set(pdata->regs, pout->clr_changed_mask);
pinmap_unset(pdata->regs, pout->clr_changed_mask);
val = readl(pdata->regs) & pout->value_mask;
gpiod_set_value(pout->gpiod, val ? 1 : 0);
pout++;
}
/* sync and enable all in pins. */
pin = pdata->in_pins;
for (x = 0; x < pdata->in_count; x++) {
sync_in_pin(pin);
pinmap_set(pdata->regs, pin->enable_mask);
pin++;
}
}
static int __init brcmstb_usb_pinmap_probe(struct platform_device *pdev)
{
struct device_node *dn = pdev->dev.of_node;
struct brcmstb_usb_pinmap_data *pdata;
struct in_pin *pin;
struct resource *r;
int out_count;
int in_count;
int err;
int irq;
int x;
get_pin_counts(dn, &in_count, &out_count);
if ((in_count + out_count) == 0)
return -EINVAL;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -EINVAL;
pdata = devm_kzalloc(&pdev->dev,
sizeof(*pdata) +
(sizeof(struct in_pin) * in_count) +
(sizeof(struct out_pin) * out_count), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->in_count = in_count;
pdata->out_count = out_count;
pdata->in_pins = (struct in_pin *)(pdata + 1);
pdata->out_pins = (struct out_pin *)(pdata->in_pins + in_count);
pdata->regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
if (!pdata->regs)
return -ENOMEM;
platform_set_drvdata(pdev, pdata);
err = parse_pins(&pdev->dev, dn, pdata);
if (err)
return err;
sync_all_pins(pdata);
if (out_count) {
/* Enable interrupt for out pins */
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
err = devm_request_irq(&pdev->dev, irq,
brcmstb_usb_pinmap_ovr_isr,
IRQF_TRIGGER_RISING,
pdev->name, pdata);
if (err < 0) {
dev_err(&pdev->dev, "Error requesting IRQ\n");
return err;
}
}
for (x = 0, pin = pdata->in_pins; x < pdata->in_count; x++, pin++) {
irq = gpiod_to_irq(pin->gpiod);
if (irq < 0) {
dev_err(&pdev->dev, "Error getting IRQ for %s pin\n",
pin->name);
return irq;
}
err = devm_request_irq(&pdev->dev, irq,
brcmstb_usb_pinmap_gpio_isr,
IRQF_SHARED | IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING,
pdev->name, pin);
if (err < 0) {
dev_err(&pdev->dev, "Error requesting IRQ for %s pin\n",
pin->name);
return err;
}
}
dev_dbg(&pdev->dev, "Driver probe succeeded\n");
dev_dbg(&pdev->dev, "In pin count: %d, out pin count: %d\n",
pdata->in_count, pdata->out_count);
return 0;
}
static const struct of_device_id brcmstb_usb_pinmap_of_match[] = {
{ .compatible = "brcm,usb-pinmap" },
{ },
};
MODULE_DEVICE_TABLE(of, brcmstb_usb_pinmap_of_match);
static struct platform_driver brcmstb_usb_pinmap_driver = {
.driver = {
.name = "brcm-usb-pinmap",
.of_match_table = brcmstb_usb_pinmap_of_match,
},
};
static int __init brcmstb_usb_pinmap_init(void)
{
return platform_driver_probe(&brcmstb_usb_pinmap_driver,
brcmstb_usb_pinmap_probe);
}
module_init(brcmstb_usb_pinmap_init);
MODULE_AUTHOR("Al Cooper <[email protected]>");
MODULE_DESCRIPTION("Broadcom USB Pinmap Driver");
MODULE_LICENSE("GPL");
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