OpenWrt – Rev 1
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/*
* APU2 LED/GPIO Driver
* Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
*
* Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
*
* Copyright (c) 2015 Carsten Spiess <fli4l at carsten-spiess.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/version.h>
#include <linux/dmi.h>
#include <linux/string.h>
#include <linux/leds.h>
#include <linux/input.h>
#include <linux/gpio_keys.h>
#define DEVNAME "leds-apu2"
#define FCH_ACPI_MMIO_BASE 0xFED80000
#define FCH_GPIO_BASE (FCH_ACPI_MMIO_BASE + 0x1500)
#define FCH_GPIO_SIZE 0x300
#define APU_NUM_GPIO 4
#define GPIO_BIT_DIR 23
#define GPIO_BIT_WRITE 22
#define GPIO_BIT_READ 16
/* internal variables */
static struct pci_dev *gpio_apu2_pci;
static DEFINE_SPINLOCK (gpio_lock);
/* the watchdog platform device */
static struct platform_device *gpio_apu2_platform_device;
static struct platform_device *leddev;
static struct platform_device *keydev;
static const struct pci_device_id gpio_apu2_pci_tbl[] ={
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, PCI_ANY_ID},
{ 0, } /* End of list */
};
MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);
/* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};
static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};
static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
{
u32 val;
val = ~ioread32 (gpio_addr[offset]);
return (val >> GPIO_BIT_DIR) & 1;
}
static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
{
u32 val;
spin_lock_bh (&gpio_lock);
val = ioread32 (gpio_addr[offset]);
val &= ~BIT(GPIO_BIT_DIR);
iowrite32 (val, gpio_addr[offset]);
spin_unlock_bh (&gpio_lock);
return 0;
}
static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
int value)
{
u32 val;
spin_lock_bh (&gpio_lock);
val = ioread32 (gpio_addr[offset]);
val |= BIT(GPIO_BIT_DIR);
iowrite32 (val, gpio_addr[offset]);
spin_unlock_bh (&gpio_lock);
return 0;
}
static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
{
u32 val;
val = ioread32 (gpio_addr[offset]);
return (val >> GPIO_BIT_READ) & 1;
}
static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value)
{
u32 val;
spin_lock_bh (&gpio_lock);
val = ioread32 (gpio_addr[offset]);
if (value)
val |= BIT(GPIO_BIT_WRITE);
else
val &= ~BIT(GPIO_BIT_WRITE);
iowrite32 (val, gpio_addr[offset]);
spin_unlock_bh (&gpio_lock);
}
static struct gpio_chip gpio_apu2_chip = {
.label = DEVNAME,
.owner = THIS_MODULE,
.base = -1,
.ngpio = APU_NUM_GPIO,
.get_direction = gpio_apu2_get_dir,
.direction_input = gpio_apu2_dir_in,
.direction_output = gpio_apu2_dir_out,
.get = gpio_apu2_get_data,
.set = gpio_apu2_set_data,
};
/*
*
*/
static int gpio_apu2_probe (struct platform_device *dev)
{
int ret = 0;
int i;
struct pci_dev *pci_dev = NULL;
/* Match the PCI device */
for_each_pci_dev (pci_dev) {
if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) {
gpio_apu2_pci = pci_dev;
break;
}
}
if (!gpio_apu2_pci)
return -ENODEV;
pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision);
/* Determine type of southbridge chipset */
if (gpio_apu2_pci->revision < 0x40) {
return -EACCES;
}
/* Request memory region for GPIO's */
if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE,
FCH_GPIO_SIZE, DEVNAME)){
pr_err ("%s: request GPIO mem region failed\n", DEVNAME);
return -ENXIO;
}
/* Map IO's for GPIO's */
for (i = 0; i < APU_NUM_GPIO; i++) {
gpio_addr[i] = devm_ioremap (&dev->dev,
FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof (u32));
if (!gpio_addr[i]) {
pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]);
return -ENXIO;
}
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
gpio_apu2_chip.dev = &dev->dev;
#else
gpio_apu2_chip.parent = &dev->dev;
#endif
ret = gpiochip_add (&gpio_apu2_chip);
if (ret) {
pr_err ("%s: adding gpiochip failed\n", DEVNAME);
}
return ret;
}
static int gpio_apu2_remove (struct platform_device *dev)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
int ret;
ret = gpiochip_remove (&gpio_apu2_chip);
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
gpiochip_remove (&gpio_apu2_chip);
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
return 0;
}
static struct platform_driver gpio_apu2_driver = {
.probe = gpio_apu2_probe,
.remove = gpio_apu2_remove,
.driver = {
.owner = THIS_MODULE,
.name = DEVNAME
}
};
static struct gpio_led apu2_leds_gpio[] = {
{
.name = "apu2:green:power",
.gpio = 509,
.active_low = 1,
},
{
.name = "apu2:green:led2",
.gpio = 510,
.active_low = 1,
},
{
.name = "apu2:green:led3",
.gpio = 511,
.active_low = 1,
},
};
static struct gpio_keys_button apu2_gpio_keys[] = {
{
.desc = "Reset button",
.type = EV_KEY,
.code = KEY_RESTART,
.debounce_interval = 60,
.gpio = 508,
.active_low = 1,
},
};
static void register_gpio_keys_polled(int id, unsigned poll_interval,
unsigned nbuttons,
struct gpio_keys_button *buttons)
{
struct gpio_keys_platform_data pdata = { };
int err;
keydev = platform_device_alloc("gpio-keys-polled", id);
if (!keydev) {
printk(KERN_ERR "Failed to allocate gpio-keys platform device\n");
return;
}
pdata.poll_interval = poll_interval;
pdata.nbuttons = nbuttons;
pdata.buttons = buttons;
err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
if (err) {
dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err);
goto err_put_pdev;
}
err = platform_device_add(keydev);
if (err) {
dev_err(&keydev->dev, "failed to register key platform device (%d)", err);
goto err_put_pdev;
}
return;
err_put_pdev:
platform_device_put(keydev);
keydev = NULL;
}
static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds)
{
struct gpio_led_platform_data pdata = { };
int err;
leddev = platform_device_alloc("leds-gpio", id);
if (!leddev) {
printk(KERN_ERR "Failed to allocate leds-gpio platform device\n");
return;
}
pdata.num_leds = num_leds;
pdata.leds = leds;
err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
if (err) {
dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err);
goto err_put_pdev;
}
err = platform_device_add(leddev);
if (err) {
dev_err(&leddev->dev, "failed to register key platform device (%d)", err);
goto err_put_pdev;
}
return;
err_put_pdev:
platform_device_put(leddev);
leddev = NULL;
}
static int __init gpio_apu2_init (void)
{
int err;
const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);
err = platform_driver_register (&gpio_apu2_driver);
if (err)
goto exit;
gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0);
if (IS_ERR(gpio_apu2_platform_device)) {
err = PTR_ERR(gpio_apu2_platform_device);
goto exit_driver;
}
pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);
register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys);
return 0;
exit_driver:
platform_driver_unregister (&gpio_apu2_driver);
exit:
return err;
}
static void __exit gpio_apu2_exit (void)
{
platform_device_unregister (gpio_apu2_platform_device);
platform_device_unregister (leddev);
platform_device_unregister (keydev);
platform_driver_unregister (&gpio_apu2_driver);
pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
}
MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
MODULE_LICENSE("GPL");
module_init (gpio_apu2_init);
module_exit (gpio_apu2_exit);