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1 office 1 /*
2 * APU2 LED/GPIO Driver
3 * Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
4 *
5 * Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
6 *
7 * Copyright (c) 2015 Carsten Spiess <fli4l at carsten-spiess.de>
8 *
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.
13 *
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.
18 *
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.
22 */
23  
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>
33 #include <linux/io.h>
34 #include <linux/version.h>
35 #include <linux/dmi.h>
36 #include <linux/string.h>
37  
38 #include <linux/leds.h>
39 #include <linux/input.h>
40 #include <linux/gpio_keys.h>
41  
42 #define DEVNAME "leds-apu2"
43  
44 #define FCH_ACPI_MMIO_BASE 0xFED80000
45 #define FCH_GPIO_BASE (FCH_ACPI_MMIO_BASE + 0x1500)
46 #define FCH_GPIO_SIZE 0x300
47  
48 #define APU_NUM_GPIO 4
49  
50 #define GPIO_BIT_DIR 23
51 #define GPIO_BIT_WRITE 22
52 #define GPIO_BIT_READ 16
53  
54 /* internal variables */
55 static struct pci_dev *gpio_apu2_pci;
56 static DEFINE_SPINLOCK (gpio_lock);
57  
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;
62  
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 */
66 };
67 MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);
68  
69 /* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
70 static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};
71  
72 static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};
73  
74 static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
75 {
76 u32 val;
77  
78 val = ~ioread32 (gpio_addr[offset]);
79  
80 return (val >> GPIO_BIT_DIR) & 1;
81 }
82  
83 static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
84 {
85 u32 val;
86  
87 spin_lock_bh (&gpio_lock);
88  
89 val = ioread32 (gpio_addr[offset]);
90 val &= ~BIT(GPIO_BIT_DIR);
91 iowrite32 (val, gpio_addr[offset]);
92  
93 spin_unlock_bh (&gpio_lock);
94  
95 return 0;
96 }
97  
98 static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
99 int value)
100 {
101 u32 val;
102  
103 spin_lock_bh (&gpio_lock);
104  
105 val = ioread32 (gpio_addr[offset]);
106 val |= BIT(GPIO_BIT_DIR);
107 iowrite32 (val, gpio_addr[offset]);
108  
109 spin_unlock_bh (&gpio_lock);
110  
111 return 0;
112 }
113  
114 static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
115 {
116 u32 val;
117  
118 val = ioread32 (gpio_addr[offset]);
119  
120 return (val >> GPIO_BIT_READ) & 1;
121 }
122  
123 static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value)
124 {
125 u32 val;
126  
127 spin_lock_bh (&gpio_lock);
128  
129 val = ioread32 (gpio_addr[offset]);
130  
131 if (value)
132 val |= BIT(GPIO_BIT_WRITE);
133 else
134 val &= ~BIT(GPIO_BIT_WRITE);
135  
136 iowrite32 (val, gpio_addr[offset]);
137  
138 spin_unlock_bh (&gpio_lock);
139 }
140  
141 static struct gpio_chip gpio_apu2_chip = {
142 .label = DEVNAME,
143 .owner = THIS_MODULE,
144 .base = -1,
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,
151 };
152  
153 /*
154 *
155 */
156 static int gpio_apu2_probe (struct platform_device *dev)
157 {
158 int ret = 0;
159 int i;
160 struct pci_dev *pci_dev = NULL;
161  
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;
166 break;
167 }
168 }
169  
170 if (!gpio_apu2_pci)
171 return -ENODEV;
172  
173 pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision);
174  
175 /* Determine type of southbridge chipset */
176 if (gpio_apu2_pci->revision < 0x40) {
177 return -EACCES;
178 }
179  
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);
184 return -ENXIO;
185 }
186  
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));
191 if (!gpio_addr[i]) {
192 pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]);
193 return -ENXIO;
194 }
195 }
196  
197 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
198 gpio_apu2_chip.dev = &dev->dev;
199 #else
200 gpio_apu2_chip.parent = &dev->dev;
201 #endif
202 ret = gpiochip_add (&gpio_apu2_chip);
203 if (ret) {
204 pr_err ("%s: adding gpiochip failed\n", DEVNAME);
205 }
206  
207 return ret;
208 }
209  
210 static int gpio_apu2_remove (struct platform_device *dev)
211 {
212 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
213 int ret;
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) */
218 return 0;
219 }
220  
221 static struct platform_driver gpio_apu2_driver = {
222 .probe = gpio_apu2_probe,
223 .remove = gpio_apu2_remove,
224 .driver = {
225 .owner = THIS_MODULE,
226 .name = DEVNAME
227 }
228 };
229  
230 static struct gpio_led apu2_leds_gpio[] = {
231 {
232 .name = "apu2:green:power",
233 .gpio = 509,
234 .active_low = 1,
235 },
236 {
237 .name = "apu2:green:led2",
238 .gpio = 510,
239 .active_low = 1,
240 },
241 {
242 .name = "apu2:green:led3",
243 .gpio = 511,
244 .active_low = 1,
245 },
246 };
247  
248 static struct gpio_keys_button apu2_gpio_keys[] = {
249 {
250 .desc = "Reset button",
251 .type = EV_KEY,
252 .code = KEY_RESTART,
253 .debounce_interval = 60,
254 .gpio = 508,
255 .active_low = 1,
256 },
257 };
258  
259 static void register_gpio_keys_polled(int id, unsigned poll_interval,
260 unsigned nbuttons,
261 struct gpio_keys_button *buttons)
262 {
263 struct gpio_keys_platform_data pdata = { };
264 int err;
265  
266 keydev = platform_device_alloc("gpio-keys-polled", id);
267 if (!keydev) {
268 printk(KERN_ERR "Failed to allocate gpio-keys platform device\n");
269 return;
270 }
271  
272 pdata.poll_interval = poll_interval;
273 pdata.nbuttons = nbuttons;
274 pdata.buttons = buttons;
275  
276 err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
277 if (err) {
278 dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err);
279 goto err_put_pdev;
280 }
281  
282 err = platform_device_add(keydev);
283 if (err) {
284 dev_err(&keydev->dev, "failed to register key platform device (%d)", err);
285 goto err_put_pdev;
286 }
287  
288 return;
289  
290 err_put_pdev:
291 platform_device_put(keydev);
292 keydev = NULL;
293 }
294  
295 static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds)
296 {
297 struct gpio_led_platform_data pdata = { };
298 int err;
299  
300 leddev = platform_device_alloc("leds-gpio", id);
301 if (!leddev) {
302 printk(KERN_ERR "Failed to allocate leds-gpio platform device\n");
303 return;
304 }
305  
306 pdata.num_leds = num_leds;
307 pdata.leds = leds;
308  
309 err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
310 if (err) {
311 dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err);
312 goto err_put_pdev;
313 }
314  
315 err = platform_device_add(leddev);
316 if (err) {
317 dev_err(&leddev->dev, "failed to register key platform device (%d)", err);
318 goto err_put_pdev;
319 }
320  
321 return;
322  
323 err_put_pdev:
324 platform_device_put(leddev);
325 leddev = NULL;
326 }
327  
328 static int __init gpio_apu2_init (void)
329 {
330 int err;
331 const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
332 const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
333  
334 pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);
335  
336 err = platform_driver_register (&gpio_apu2_driver);
337 if (err)
338 goto exit;
339  
340 gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0);
341 if (IS_ERR(gpio_apu2_platform_device)) {
342 err = PTR_ERR(gpio_apu2_platform_device);
343 goto exit_driver;
344 }
345  
346 pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);
347  
348 register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
349 register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys);
350 return 0;
351  
352 exit_driver:
353 platform_driver_unregister (&gpio_apu2_driver);
354 exit:
355 return err;
356 }
357  
358 static void __exit gpio_apu2_exit (void)
359 {
360 platform_device_unregister (gpio_apu2_platform_device);
361 platform_device_unregister (leddev);
362 platform_device_unregister (keydev);
363 platform_driver_unregister (&gpio_apu2_driver);
364 pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
365 }
366  
367 MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
368 MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
369 MODULE_LICENSE("GPL");
370  
371 module_init (gpio_apu2_init);
372 module_exit (gpio_apu2_exit);