Contributors: 18
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Alek Du |
940 |
47.07% |
3 |
6.67% |
| David Cohen |
284 |
14.22% |
5 |
11.11% |
| Linus Walleij |
162 |
8.11% |
7 |
15.56% |
| Kristen Carlson Accardi |
149 |
7.46% |
1 |
2.22% |
| Adrian Hunter |
146 |
7.31% |
1 |
2.22% |
| Mika Westerberg |
132 |
6.61% |
5 |
11.11% |
| Andy Shevchenko |
96 |
4.81% |
10 |
22.22% |
| Thomas Gleixner |
46 |
2.30% |
3 |
6.67% |
| Lennert Buytenhek |
12 |
0.60% |
1 |
2.22% |
| Pan Xinhui |
7 |
0.35% |
1 |
2.22% |
| Jingoo Han |
6 |
0.30% |
1 |
2.22% |
| Feng Tang |
5 |
0.25% |
1 |
2.22% |
| Tejun Heo |
3 |
0.15% |
1 |
2.22% |
| Thierry Reding |
3 |
0.15% |
1 |
2.22% |
| Geliang Tang |
2 |
0.10% |
1 |
2.22% |
| Alan Cox |
2 |
0.10% |
1 |
2.22% |
| Roel Kluin |
1 |
0.05% |
1 |
2.22% |
| Augusto Mecking Caringi |
1 |
0.05% |
1 |
2.22% |
| Total |
1997 |
|
45 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Intel MID GPIO driver
*
* Copyright (c) 2008-2014,2016 Intel Corporation.
*/
/* Supports:
* Moorestown platform Langwell chip.
* Medfield platform Penwell chip.
* Clovertrail platform Cloverview chip.
*/
#include <linux/delay.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#define INTEL_MID_IRQ_TYPE_EDGE (1 << 0)
#define INTEL_MID_IRQ_TYPE_LEVEL (1 << 1)
/*
* Langwell chip has 64 pins and thus there are 2 32bit registers to control
* each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
* registers to control them, so we only define the order here instead of a
* structure, to get a bit offset for a pin (use GPDR as an example):
*
* nreg = ngpio / 32;
* reg = offset / 32;
* bit = offset % 32;
* reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
*
* so the bit of reg_addr is to control pin offset's GPDR feature
*/
enum GPIO_REG {
GPLR = 0, /* pin level read-only */
GPDR, /* pin direction */
GPSR, /* pin set */
GPCR, /* pin clear */
GRER, /* rising edge detect */
GFER, /* falling edge detect */
GEDR, /* edge detect result */
GAFR, /* alt function */
};
/* intel_mid gpio driver data */
struct intel_mid_gpio_ddata {
u16 ngpio; /* number of gpio pins */
u32 chip_irq_type; /* chip interrupt type */
};
struct intel_mid_gpio {
struct gpio_chip chip;
void __iomem *reg_base;
spinlock_t lock;
struct pci_dev *pdev;
};
static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
enum GPIO_REG reg_type)
{
struct intel_mid_gpio *priv = gpiochip_get_data(chip);
unsigned nreg = chip->ngpio / 32;
u8 reg = offset / 32;
return priv->reg_base + reg_type * nreg * 4 + reg * 4;
}
static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset,
enum GPIO_REG reg_type)
{
struct intel_mid_gpio *priv = gpiochip_get_data(chip);
unsigned nreg = chip->ngpio / 32;
u8 reg = offset / 16;
return priv->reg_base + reg_type * nreg * 4 + reg * 4;
}
static int intel_gpio_request(struct gpio_chip *chip, unsigned offset)
{
void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR);
u32 value = readl(gafr);
int shift = (offset % 16) << 1, af = (value >> shift) & 3;
if (af) {
value &= ~(3 << shift);
writel(value, gafr);
}
return 0;
}
static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
{
void __iomem *gplr = gpio_reg(chip, offset, GPLR);
return !!(readl(gplr) & BIT(offset % 32));
}
static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
void __iomem *gpsr, *gpcr;
if (value) {
gpsr = gpio_reg(chip, offset, GPSR);
writel(BIT(offset % 32), gpsr);
} else {
gpcr = gpio_reg(chip, offset, GPCR);
writel(BIT(offset % 32), gpcr);
}
}
static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct intel_mid_gpio *priv = gpiochip_get_data(chip);
void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
u32 value;
unsigned long flags;
if (priv->pdev)
pm_runtime_get(&priv->pdev->dev);
spin_lock_irqsave(&priv->lock, flags);
value = readl(gpdr);
value &= ~BIT(offset % 32);
writel(value, gpdr);
spin_unlock_irqrestore(&priv->lock, flags);
if (priv->pdev)
pm_runtime_put(&priv->pdev->dev);
return 0;
}
static int intel_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct intel_mid_gpio *priv = gpiochip_get_data(chip);
void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
unsigned long flags;
intel_gpio_set(chip, offset, value);
if (priv->pdev)
pm_runtime_get(&priv->pdev->dev);
spin_lock_irqsave(&priv->lock, flags);
value = readl(gpdr);
value |= BIT(offset % 32);
writel(value, gpdr);
spin_unlock_irqrestore(&priv->lock, flags);
if (priv->pdev)
pm_runtime_put(&priv->pdev->dev);
return 0;
}
static int intel_mid_irq_type(struct irq_data *d, unsigned type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_mid_gpio *priv = gpiochip_get_data(gc);
u32 gpio = irqd_to_hwirq(d);
unsigned long flags;
u32 value;
void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER);
void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER);
if (gpio >= priv->chip.ngpio)
return -EINVAL;
if (priv->pdev)
pm_runtime_get(&priv->pdev->dev);
spin_lock_irqsave(&priv->lock, flags);
if (type & IRQ_TYPE_EDGE_RISING)
value = readl(grer) | BIT(gpio % 32);
else
value = readl(grer) & (~BIT(gpio % 32));
writel(value, grer);
if (type & IRQ_TYPE_EDGE_FALLING)
value = readl(gfer) | BIT(gpio % 32);
else
value = readl(gfer) & (~BIT(gpio % 32));
writel(value, gfer);
spin_unlock_irqrestore(&priv->lock, flags);
if (priv->pdev)
pm_runtime_put(&priv->pdev->dev);
return 0;
}
static void intel_mid_irq_unmask(struct irq_data *d)
{
}
static void intel_mid_irq_mask(struct irq_data *d)
{
}
static struct irq_chip intel_mid_irqchip = {
.name = "INTEL_MID-GPIO",
.irq_mask = intel_mid_irq_mask,
.irq_unmask = intel_mid_irq_unmask,
.irq_set_type = intel_mid_irq_type,
};
static const struct intel_mid_gpio_ddata gpio_lincroft = {
.ngpio = 64,
};
static const struct intel_mid_gpio_ddata gpio_penwell_aon = {
.ngpio = 96,
.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};
static const struct intel_mid_gpio_ddata gpio_penwell_core = {
.ngpio = 96,
.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};
static const struct intel_mid_gpio_ddata gpio_cloverview_aon = {
.ngpio = 96,
.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL,
};
static const struct intel_mid_gpio_ddata gpio_cloverview_core = {
.ngpio = 96,
.chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE,
};
static const struct pci_device_id intel_gpio_ids[] = {
{
/* Lincroft */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f),
.driver_data = (kernel_ulong_t)&gpio_lincroft,
},
{
/* Penwell AON */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f),
.driver_data = (kernel_ulong_t)&gpio_penwell_aon,
},
{
/* Penwell Core */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a),
.driver_data = (kernel_ulong_t)&gpio_penwell_core,
},
{
/* Cloverview Aon */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb),
.driver_data = (kernel_ulong_t)&gpio_cloverview_aon,
},
{
/* Cloverview Core */
PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7),
.driver_data = (kernel_ulong_t)&gpio_cloverview_core,
},
{ }
};
static void intel_mid_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *gc = irq_desc_get_handler_data(desc);
struct intel_mid_gpio *priv = gpiochip_get_data(gc);
struct irq_data *data = irq_desc_get_irq_data(desc);
struct irq_chip *chip = irq_data_get_irq_chip(data);
u32 base, gpio, mask;
unsigned long pending;
void __iomem *gedr;
/* check GPIO controller to check which pin triggered the interrupt */
for (base = 0; base < priv->chip.ngpio; base += 32) {
gedr = gpio_reg(&priv->chip, base, GEDR);
while ((pending = readl(gedr))) {
gpio = __ffs(pending);
mask = BIT(gpio);
/* Clear before handling so we can't lose an edge */
writel(mask, gedr);
generic_handle_irq(irq_find_mapping(gc->irq.domain,
base + gpio));
}
}
chip->irq_eoi(data);
}
static int intel_mid_irq_init_hw(struct gpio_chip *chip)
{
struct intel_mid_gpio *priv = gpiochip_get_data(chip);
void __iomem *reg;
unsigned base;
for (base = 0; base < priv->chip.ngpio; base += 32) {
/* Clear the rising-edge detect register */
reg = gpio_reg(&priv->chip, base, GRER);
writel(0, reg);
/* Clear the falling-edge detect register */
reg = gpio_reg(&priv->chip, base, GFER);
writel(0, reg);
/* Clear the edge detect status register */
reg = gpio_reg(&priv->chip, base, GEDR);
writel(~0, reg);
}
return 0;
}
static int __maybe_unused intel_gpio_runtime_idle(struct device *dev)
{
int err = pm_schedule_suspend(dev, 500);
return err ?: -EBUSY;
}
static const struct dev_pm_ops intel_gpio_pm_ops = {
SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle)
};
static int intel_gpio_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
void __iomem *base;
struct intel_mid_gpio *priv;
u32 gpio_base;
u32 irq_base;
int retval;
struct gpio_irq_chip *girq;
struct intel_mid_gpio_ddata *ddata =
(struct intel_mid_gpio_ddata *)id->driver_data;
retval = pcim_enable_device(pdev);
if (retval)
return retval;
retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, pci_name(pdev));
if (retval) {
dev_err(&pdev->dev, "I/O memory mapping error\n");
return retval;
}
base = pcim_iomap_table(pdev)[1];
irq_base = readl(base);
gpio_base = readl(sizeof(u32) + base);
/* release the IO mapping, since we already get the info from bar1 */
pcim_iounmap_regions(pdev, 1 << 1);
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->reg_base = pcim_iomap_table(pdev)[0];
priv->chip.label = dev_name(&pdev->dev);
priv->chip.parent = &pdev->dev;
priv->chip.request = intel_gpio_request;
priv->chip.direction_input = intel_gpio_direction_input;
priv->chip.direction_output = intel_gpio_direction_output;
priv->chip.get = intel_gpio_get;
priv->chip.set = intel_gpio_set;
priv->chip.base = gpio_base;
priv->chip.ngpio = ddata->ngpio;
priv->chip.can_sleep = false;
priv->pdev = pdev;
spin_lock_init(&priv->lock);
girq = &priv->chip.irq;
girq->chip = &intel_mid_irqchip;
girq->init_hw = intel_mid_irq_init_hw;
girq->parent_handler = intel_mid_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
girq->parents[0] = pdev->irq;
girq->first = irq_base;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_simple_irq;
pci_set_drvdata(pdev, priv);
retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
if (retval) {
dev_err(&pdev->dev, "gpiochip_add error %d\n", retval);
return retval;
}
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_allow(&pdev->dev);
return 0;
}
static struct pci_driver intel_gpio_driver = {
.name = "intel_mid_gpio",
.id_table = intel_gpio_ids,
.probe = intel_gpio_probe,
.driver = {
.pm = &intel_gpio_pm_ops,
},
};
builtin_pci_driver(intel_gpio_driver);