3 * Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
5 * Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
7 * Copyright (c) 2015 Carsten Spiess <fli4l at carsten-spiess.de>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/miscdevice.h>
27 #include <linux/gpio.h>
28 #include <linux/init.h>
29 #include <linux/pci.h>
30 #include <linux/ioport.h>
31 #include <linux/platform_device.h>
32 #include <linux/uaccess.h>
34 #include <linux/version.h>
35 #include <linux/dmi.h>
36 #include <linux/string.h>
38 #include <linux/leds.h>
39 #include <linux/input.h>
40 #include <linux/gpio_keys.h>
42 #define DEVNAME "leds-apu2"
44 #define FCH_ACPI_MMIO_BASE 0xFED80000
45 #define FCH_GPIO_BASE (FCH_ACPI_MMIO_BASE + 0x1500)
46 #define FCH_GPIO_SIZE 0x300
48 #define APU_NUM_GPIO 4
50 #define GPIO_BIT_DIR 23
51 #define GPIO_BIT_WRITE 22
52 #define GPIO_BIT_READ 16
54 /* internal variables */
55 static struct pci_dev
*gpio_apu2_pci
;
56 static DEFINE_SPINLOCK (gpio_lock
);
58 /* the watchdog platform device */
59 static struct platform_device
*gpio_apu2_platform_device
;
60 static struct platform_device
*leddev
;
61 static struct platform_device
*keydev
;
63 static const struct pci_device_id gpio_apu2_pci_tbl
[] ={
64 {PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS
, PCI_ANY_ID
, PCI_ANY_ID
},
65 { 0, } /* End of list */
67 MODULE_DEVICE_TABLE (pci
, gpio_apu2_pci_tbl
);
69 /* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
70 static u8 gpio_offset
[APU_NUM_GPIO
] = {89, 68, 69, 70};
72 static void __iomem
*gpio_addr
[APU_NUM_GPIO
] = {NULL
, NULL
, NULL
, NULL
};
74 static int gpio_apu2_get_dir (struct gpio_chip
*chip
, unsigned offset
)
78 val
= ~ioread32 (gpio_addr
[offset
]);
80 return (val
>> GPIO_BIT_DIR
) & 1;
83 static int gpio_apu2_dir_in (struct gpio_chip
*gc
, unsigned offset
)
87 spin_lock_bh (&gpio_lock
);
89 val
= ioread32 (gpio_addr
[offset
]);
90 val
&= ~BIT(GPIO_BIT_DIR
);
91 iowrite32 (val
, gpio_addr
[offset
]);
93 spin_unlock_bh (&gpio_lock
);
98 static int gpio_apu2_dir_out (struct gpio_chip
*chip
, unsigned offset
,
103 spin_lock_bh (&gpio_lock
);
105 val
= ioread32 (gpio_addr
[offset
]);
106 val
|= BIT(GPIO_BIT_DIR
);
107 iowrite32 (val
, gpio_addr
[offset
]);
109 spin_unlock_bh (&gpio_lock
);
114 static int gpio_apu2_get_data (struct gpio_chip
*chip
, unsigned offset
)
118 val
= ioread32 (gpio_addr
[offset
]);
120 return (val
>> GPIO_BIT_READ
) & 1;
123 static void gpio_apu2_set_data (struct gpio_chip
*chip
, unsigned offset
, int value
)
127 spin_lock_bh (&gpio_lock
);
129 val
= ioread32 (gpio_addr
[offset
]);
132 val
|= BIT(GPIO_BIT_WRITE
);
134 val
&= ~BIT(GPIO_BIT_WRITE
);
136 iowrite32 (val
, gpio_addr
[offset
]);
138 spin_unlock_bh (&gpio_lock
);
141 static struct gpio_chip gpio_apu2_chip
= {
143 .owner
= THIS_MODULE
,
145 .ngpio
= APU_NUM_GPIO
,
146 .get_direction
= gpio_apu2_get_dir
,
147 .direction_input
= gpio_apu2_dir_in
,
148 .direction_output
= gpio_apu2_dir_out
,
149 .get
= gpio_apu2_get_data
,
150 .set
= gpio_apu2_set_data
,
156 static int gpio_apu2_probe (struct platform_device
*dev
)
160 struct pci_dev
*pci_dev
= NULL
;
162 /* Match the PCI device */
163 for_each_pci_dev (pci_dev
) {
164 if (pci_match_id (gpio_apu2_pci_tbl
, pci_dev
) != NULL
) {
165 gpio_apu2_pci
= pci_dev
;
173 pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME
, gpio_apu2_pci
->revision
);
175 /* Determine type of southbridge chipset */
176 if (gpio_apu2_pci
->revision
< 0x40) {
180 /* Request memory region for GPIO's */
181 if (!devm_request_mem_region (&dev
->dev
, FCH_GPIO_BASE
,
182 FCH_GPIO_SIZE
, DEVNAME
)){
183 pr_err ("%s: request GPIO mem region failed\n", DEVNAME
);
187 /* Map IO's for GPIO's */
188 for (i
= 0; i
< APU_NUM_GPIO
; i
++) {
189 gpio_addr
[i
] = devm_ioremap (&dev
->dev
,
190 FCH_GPIO_BASE
+ (gpio_offset
[i
] * sizeof (u32
)), sizeof (u32
));
192 pr_err ("%s: map GPIO%d address failed\n", DEVNAME
, gpio_offset
[i
]);
197 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
198 gpio_apu2_chip
.dev
= &dev
->dev
;
200 gpio_apu2_chip
.parent
= &dev
->dev
;
202 ret
= gpiochip_add (&gpio_apu2_chip
);
204 pr_err ("%s: adding gpiochip failed\n", DEVNAME
);
210 static int gpio_apu2_remove (struct platform_device
*dev
)
212 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
214 ret
= gpiochip_remove (&gpio_apu2_chip
);
215 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
216 gpiochip_remove (&gpio_apu2_chip
);
217 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
221 static struct platform_driver gpio_apu2_driver
= {
222 .probe
= gpio_apu2_probe
,
223 .remove
= gpio_apu2_remove
,
225 .owner
= THIS_MODULE
,
230 static struct gpio_led apu2_leds_gpio
[] = {
232 .name
= "apu2:green:power",
237 .name
= "apu2:green:led2",
242 .name
= "apu2:green:led3",
248 static struct gpio_keys_button apu2_gpio_keys
[] = {
250 .desc
= "Reset button",
253 .debounce_interval
= 60,
259 static void register_gpio_keys_polled(int id
, unsigned poll_interval
,
261 struct gpio_keys_button
*buttons
)
263 struct gpio_keys_platform_data pdata
= { };
266 keydev
= platform_device_alloc("gpio-keys-polled", id
);
268 printk(KERN_ERR
"Failed to allocate gpio-keys platform device\n");
272 pdata
.poll_interval
= poll_interval
;
273 pdata
.nbuttons
= nbuttons
;
274 pdata
.buttons
= buttons
;
276 err
= platform_device_add_data(keydev
, &pdata
, sizeof(pdata
));
278 dev_err(&keydev
->dev
, "failed to add platform data to key driver (%d)", err
);
282 err
= platform_device_add(keydev
);
284 dev_err(&keydev
->dev
, "failed to register key platform device (%d)", err
);
291 platform_device_put(keydev
);
295 static void register_leds_gpio(int id
, unsigned num_leds
, struct gpio_led
*leds
)
297 struct gpio_led_platform_data pdata
= { };
300 leddev
= platform_device_alloc("leds-gpio", id
);
302 printk(KERN_ERR
"Failed to allocate leds-gpio platform device\n");
306 pdata
.num_leds
= num_leds
;
309 err
= platform_device_add_data(leddev
, &pdata
, sizeof(pdata
));
311 dev_err(&leddev
->dev
, "failed to add platform data to key driver (%d)", err
);
315 err
= platform_device_add(leddev
);
317 dev_err(&leddev
->dev
, "failed to register key platform device (%d)", err
);
324 platform_device_put(leddev
);
328 static int __init
gpio_apu2_init (void)
331 const char *board_vendor
= dmi_get_system_info(DMI_BOARD_VENDOR
);
332 const char *board_name
= dmi_get_system_info(DMI_BOARD_NAME
);
334 /* Match the device name/model */
335 if (!board_name
|| !board_vendor
|| strcasecmp(board_vendor
, "PC Engines") || strcasecmp(board_name
, "apu2")) {
340 pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME
);
342 err
= platform_driver_register (&gpio_apu2_driver
);
346 gpio_apu2_platform_device
= platform_device_register_simple (DEVNAME
, -1, NULL
, 0);
347 if (IS_ERR(gpio_apu2_platform_device
)) {
348 err
= PTR_ERR(gpio_apu2_platform_device
);
352 pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME
);
354 register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio
), apu2_leds_gpio
);
355 register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys
), apu2_gpio_keys
);
359 platform_driver_unregister (&gpio_apu2_driver
);
364 static void __exit
gpio_apu2_exit (void)
366 platform_device_unregister (gpio_apu2_platform_device
);
367 platform_device_unregister (leddev
);
368 platform_device_unregister (keydev
);
369 platform_driver_unregister (&gpio_apu2_driver
);
370 pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME
);
373 MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
374 MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
375 MODULE_LICENSE("GPL");
377 module_init (gpio_apu2_init
);
378 module_exit (gpio_apu2_exit
);