1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * PIKA Warp(tm) board specific routines
4 *
5 * Copyright (c) 2008-2009 PIKA Technologies
6 * Sean MacLennan <smaclennan@pikatech.com>
7 */
8 #include <linux/err.h>
9 #include <linux/init.h>
10 #include <linux/of_platform.h>
11 #include <linux/kthread.h>
12 #include <linux/leds.h>
13 #include <linux/i2c.h>
14 #include <linux/interrupt.h>
15 #include <linux/delay.h>
16 #include <linux/of_address.h>
17 #include <linux/of_irq.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21
22 #include <asm/machdep.h>
23 #include <asm/udbg.h>
24 #include <asm/time.h>
25 #include <asm/uic.h>
26 #include <asm/ppc4xx.h>
27 #include <asm/dma.h>
28
29
30 static const struct of_device_id warp_of_bus[] __initconst = {
31 { .compatible = "ibm,plb4", },
32 { .compatible = "ibm,opb", },
33 { .compatible = "ibm,ebc", },
34 {},
35 };
36
warp_device_probe(void)37 static int __init warp_device_probe(void)
38 {
39 of_platform_bus_probe(NULL, warp_of_bus, NULL);
40 return 0;
41 }
42 machine_device_initcall(warp, warp_device_probe);
43
define_machine(warp)44 define_machine(warp) {
45 .name = "Warp",
46 .compatible = "pika,warp",
47 .progress = udbg_progress,
48 .init_IRQ = uic_init_tree,
49 .get_irq = uic_get_irq,
50 .restart = ppc4xx_reset_system,
51 };
52
53
warp_post_info(void)54 static int __init warp_post_info(void)
55 {
56 struct device_node *np;
57 void __iomem *fpga;
58 u32 post1, post2;
59
60 /* Sighhhh... POST information is in the sd area. */
61 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
62 if (np == NULL)
63 return -ENOENT;
64
65 fpga = of_iomap(np, 0);
66 of_node_put(np);
67 if (fpga == NULL)
68 return -ENOENT;
69
70 post1 = in_be32(fpga + 0x40);
71 post2 = in_be32(fpga + 0x44);
72
73 iounmap(fpga);
74
75 if (post1 || post2)
76 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
77 else
78 printk(KERN_INFO "Warp POST OK\n");
79
80 return 0;
81 }
82
83
84 #ifdef CONFIG_SENSORS_AD7414
85
86 static void __iomem *dtm_fpga;
87
88 #define WARP_GREEN_LED 0
89 #define WARP_RED_LED 1
90
91 static struct gpio_led warp_gpio_led_pins[] = {
92 [WARP_GREEN_LED] = {
93 .name = "green",
94 .default_state = LEDS_DEFSTATE_KEEP,
95 .gpiod = NULL, /* to be filled by pika_setup_leds() */
96 },
97 [WARP_RED_LED] = {
98 .name = "red",
99 .default_state = LEDS_DEFSTATE_KEEP,
100 .gpiod = NULL, /* to be filled by pika_setup_leds() */
101 },
102 };
103
104 static struct gpio_led_platform_data warp_gpio_led_data = {
105 .leds = warp_gpio_led_pins,
106 .num_leds = ARRAY_SIZE(warp_gpio_led_pins),
107 };
108
109 static struct platform_device warp_gpio_leds = {
110 .name = "leds-gpio",
111 .id = -1,
112 .dev = {
113 .platform_data = &warp_gpio_led_data,
114 },
115 };
116
temp_isr(int irq,void * context)117 static irqreturn_t temp_isr(int irq, void *context)
118 {
119 int value = 1;
120
121 local_irq_disable();
122
123 gpiod_set_value(warp_gpio_led_pins[WARP_GREEN_LED].gpiod, 0);
124
125 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
126
127 while (1) {
128 if (dtm_fpga) {
129 unsigned reset = in_be32(dtm_fpga + 0x14);
130 out_be32(dtm_fpga + 0x14, reset);
131 }
132
133 gpiod_set_value(warp_gpio_led_pins[WARP_RED_LED].gpiod, value);
134 value ^= 1;
135 mdelay(500);
136 }
137
138 /* Not reached */
139 return IRQ_HANDLED;
140 }
141
142 /*
143 * Because green and red power LEDs are normally driven by leds-gpio driver,
144 * but in case of critical temperature shutdown we want to drive them
145 * ourselves, we acquire both and then create leds-gpio platform device
146 * ourselves, instead of doing it through device tree. This way we can still
147 * keep access to the gpios and use them when needed.
148 */
pika_setup_leds(void)149 static int pika_setup_leds(void)
150 {
151 struct device_node *np, *child;
152 struct gpio_desc *gpio;
153 struct gpio_led *led;
154 int led_count = 0;
155 int error;
156 int i;
157
158 np = of_find_compatible_node(NULL, NULL, "warp-power-leds");
159 if (!np) {
160 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
161 return -ENOENT;
162 }
163
164 for_each_child_of_node(np, child) {
165 for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
166 led = &warp_gpio_led_pins[i];
167
168 if (!of_node_name_eq(child, led->name))
169 continue;
170
171 if (led->gpiod) {
172 printk(KERN_ERR __FILE__ ": %s led has already been defined\n",
173 led->name);
174 continue;
175 }
176
177 gpio = fwnode_gpiod_get_index(of_fwnode_handle(child),
178 NULL, 0, GPIOD_ASIS,
179 led->name);
180 error = PTR_ERR_OR_ZERO(gpio);
181 if (error) {
182 printk(KERN_ERR __FILE__ ": Failed to get %s led gpio: %d\n",
183 led->name, error);
184 of_node_put(child);
185 goto err_cleanup_pins;
186 }
187
188 led->gpiod = gpio;
189 led_count++;
190 }
191 }
192
193 of_node_put(np);
194
195 /* Skip device registration if no leds have been defined */
196 if (led_count) {
197 error = platform_device_register(&warp_gpio_leds);
198 if (error) {
199 printk(KERN_ERR __FILE__ ": Unable to add leds-gpio: %d\n",
200 error);
201 goto err_cleanup_pins;
202 }
203 }
204
205 return 0;
206
207 err_cleanup_pins:
208 for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
209 led = &warp_gpio_led_pins[i];
210 gpiod_put(led->gpiod);
211 led->gpiod = NULL;
212 }
213 return error;
214 }
215
pika_setup_critical_temp(struct device_node * np,struct i2c_client * client)216 static void pika_setup_critical_temp(struct device_node *np,
217 struct i2c_client *client)
218 {
219 int irq, rc;
220
221 /* Do this before enabling critical temp interrupt since we
222 * may immediately interrupt.
223 */
224 pika_setup_leds();
225
226 /* These registers are in 1 degree increments. */
227 i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
228 i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
229
230 irq = irq_of_parse_and_map(np, 0);
231 if (!irq) {
232 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
233 return;
234 }
235
236 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
237 if (rc) {
238 printk(KERN_ERR __FILE__
239 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
240 return;
241 }
242 }
243
pika_dtm_check_fan(void __iomem * fpga)244 static inline void pika_dtm_check_fan(void __iomem *fpga)
245 {
246 static int fan_state;
247 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
248
249 if (fan_state != fan) {
250 fan_state = fan;
251 if (fan)
252 printk(KERN_WARNING "Fan rotation error detected."
253 " Please check hardware.\n");
254 }
255 }
256
pika_dtm_thread(void __iomem * fpga)257 static int pika_dtm_thread(void __iomem *fpga)
258 {
259 struct device_node *np;
260 struct i2c_client *client;
261
262 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
263 if (np == NULL)
264 return -ENOENT;
265
266 client = of_find_i2c_device_by_node(np);
267 if (client == NULL) {
268 of_node_put(np);
269 return -ENOENT;
270 }
271
272 pika_setup_critical_temp(np, client);
273
274 of_node_put(np);
275
276 printk(KERN_INFO "Warp DTM thread running.\n");
277
278 while (!kthread_should_stop()) {
279 int val;
280
281 val = i2c_smbus_read_word_data(client, 0);
282 if (val < 0)
283 dev_dbg(&client->dev, "DTM read temp failed.\n");
284 else {
285 s16 temp = swab16(val);
286 out_be32(fpga + 0x20, temp);
287 }
288
289 pika_dtm_check_fan(fpga);
290
291 set_current_state(TASK_INTERRUPTIBLE);
292 schedule_timeout(HZ);
293 }
294
295 return 0;
296 }
297
pika_dtm_start(void)298 static int __init pika_dtm_start(void)
299 {
300 struct task_struct *dtm_thread;
301 struct device_node *np;
302
303 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
304 if (np == NULL)
305 return -ENOENT;
306
307 dtm_fpga = of_iomap(np, 0);
308 of_node_put(np);
309 if (dtm_fpga == NULL)
310 return -ENOENT;
311
312 /* Must get post info before thread starts. */
313 warp_post_info();
314
315 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
316 if (IS_ERR(dtm_thread)) {
317 iounmap(dtm_fpga);
318 return PTR_ERR(dtm_thread);
319 }
320
321 return 0;
322 }
323 machine_late_initcall(warp, pika_dtm_start);
324
325 #else /* !CONFIG_SENSORS_AD7414 */
326
327 machine_late_initcall(warp, warp_post_info);
328
329 #endif
330
