--- /dev/null
+/*
+* 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;
+ }
+ }
+
+ gpio_apu2_chip.dev = &dev->dev;
+ 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);
+
+ /* Match the device name/model */
+ if (!board_name || !board_vendor || strcasecmp(board_vendor, "PC Engines") || strcasecmp(board_name, "apu2")) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ 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);
projects / openwrt / staging / chunkeey.git / commitdiff