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/init.h>
9 #include <linux/of_platform.h>
10 #include <linux/kthread.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/delay.h>
14 #include <linux/of_address.h>
15 #include <linux/of_irq.h>
16 #include <linux/of_gpio.h>
17 #include <linux/slab.h>
18 #include <linux/export.h>
19
20 #include <asm/machdep.h>
21 #include <asm/udbg.h>
22 #include <asm/time.h>
23 #include <asm/uic.h>
24 #include <asm/ppc4xx.h>
25 #include <asm/dma.h>
26
27
28 static const struct of_device_id warp_of_bus[] __initconst = {
29 { .compatible = "ibm,plb4", },
30 { .compatible = "ibm,opb", },
31 { .compatible = "ibm,ebc", },
32 {},
33 };
34
warp_device_probe(void)35 static int __init warp_device_probe(void)
36 {
37 of_platform_bus_probe(NULL, warp_of_bus, NULL);
38 return 0;
39 }
40 machine_device_initcall(warp, warp_device_probe);
41
warp_probe(void)42 static int __init warp_probe(void)
43 {
44 if (!of_machine_is_compatible("pika,warp"))
45 return 0;
46
47 return 1;
48 }
49
define_machine(warp)50 define_machine(warp) {
51 .name = "Warp",
52 .probe = warp_probe,
53 .progress = udbg_progress,
54 .init_IRQ = uic_init_tree,
55 .get_irq = uic_get_irq,
56 .restart = ppc4xx_reset_system,
57 .calibrate_decr = generic_calibrate_decr,
58 };
59
60
warp_post_info(void)61 static int __init warp_post_info(void)
62 {
63 struct device_node *np;
64 void __iomem *fpga;
65 u32 post1, post2;
66
67 /* Sighhhh... POST information is in the sd area. */
68 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
69 if (np == NULL)
70 return -ENOENT;
71
72 fpga = of_iomap(np, 0);
73 of_node_put(np);
74 if (fpga == NULL)
75 return -ENOENT;
76
77 post1 = in_be32(fpga + 0x40);
78 post2 = in_be32(fpga + 0x44);
79
80 iounmap(fpga);
81
82 if (post1 || post2)
83 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
84 else
85 printk(KERN_INFO "Warp POST OK\n");
86
87 return 0;
88 }
89
90
91 #ifdef CONFIG_SENSORS_AD7414
92
93 static LIST_HEAD(dtm_shutdown_list);
94 static void __iomem *dtm_fpga;
95 static unsigned green_led, red_led;
96
97
98 struct dtm_shutdown {
99 struct list_head list;
100 void (*func)(void *arg);
101 void *arg;
102 };
103
104
pika_dtm_register_shutdown(void (* func)(void * arg),void * arg)105 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
106 {
107 struct dtm_shutdown *shutdown;
108
109 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
110 if (shutdown == NULL)
111 return -ENOMEM;
112
113 shutdown->func = func;
114 shutdown->arg = arg;
115
116 list_add(&shutdown->list, &dtm_shutdown_list);
117
118 return 0;
119 }
120
pika_dtm_unregister_shutdown(void (* func)(void * arg),void * arg)121 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
122 {
123 struct dtm_shutdown *shutdown;
124
125 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
126 if (shutdown->func == func && shutdown->arg == arg) {
127 list_del(&shutdown->list);
128 kfree(shutdown);
129 return 0;
130 }
131
132 return -EINVAL;
133 }
134
temp_isr(int irq,void * context)135 static irqreturn_t temp_isr(int irq, void *context)
136 {
137 struct dtm_shutdown *shutdown;
138 int value = 1;
139
140 local_irq_disable();
141
142 gpio_set_value(green_led, 0);
143
144 /* Run through the shutdown list. */
145 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
146 shutdown->func(shutdown->arg);
147
148 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
149
150 while (1) {
151 if (dtm_fpga) {
152 unsigned reset = in_be32(dtm_fpga + 0x14);
153 out_be32(dtm_fpga + 0x14, reset);
154 }
155
156 gpio_set_value(red_led, value);
157 value ^= 1;
158 mdelay(500);
159 }
160
161 /* Not reached */
162 return IRQ_HANDLED;
163 }
164
pika_setup_leds(void)165 static int pika_setup_leds(void)
166 {
167 struct device_node *np, *child;
168
169 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
170 if (!np) {
171 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
172 return -ENOENT;
173 }
174
175 for_each_child_of_node(np, child)
176 if (of_node_name_eq(child, "green"))
177 green_led = of_get_gpio(child, 0);
178 else if (of_node_name_eq(child, "red"))
179 red_led = of_get_gpio(child, 0);
180
181 of_node_put(np);
182
183 return 0;
184 }
185
pika_setup_critical_temp(struct device_node * np,struct i2c_client * client)186 static void pika_setup_critical_temp(struct device_node *np,
187 struct i2c_client *client)
188 {
189 int irq, rc;
190
191 /* Do this before enabling critical temp interrupt since we
192 * may immediately interrupt.
193 */
194 pika_setup_leds();
195
196 /* These registers are in 1 degree increments. */
197 i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
198 i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
199
200 irq = irq_of_parse_and_map(np, 0);
201 if (!irq) {
202 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
203 return;
204 }
205
206 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
207 if (rc) {
208 printk(KERN_ERR __FILE__
209 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
210 return;
211 }
212 }
213
pika_dtm_check_fan(void __iomem * fpga)214 static inline void pika_dtm_check_fan(void __iomem *fpga)
215 {
216 static int fan_state;
217 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
218
219 if (fan_state != fan) {
220 fan_state = fan;
221 if (fan)
222 printk(KERN_WARNING "Fan rotation error detected."
223 " Please check hardware.\n");
224 }
225 }
226
pika_dtm_thread(void __iomem * fpga)227 static int pika_dtm_thread(void __iomem *fpga)
228 {
229 struct device_node *np;
230 struct i2c_client *client;
231
232 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
233 if (np == NULL)
234 return -ENOENT;
235
236 client = of_find_i2c_device_by_node(np);
237 if (client == NULL) {
238 of_node_put(np);
239 return -ENOENT;
240 }
241
242 pika_setup_critical_temp(np, client);
243
244 of_node_put(np);
245
246 printk(KERN_INFO "Warp DTM thread running.\n");
247
248 while (!kthread_should_stop()) {
249 int val;
250
251 val = i2c_smbus_read_word_data(client, 0);
252 if (val < 0)
253 dev_dbg(&client->dev, "DTM read temp failed.\n");
254 else {
255 s16 temp = swab16(val);
256 out_be32(fpga + 0x20, temp);
257 }
258
259 pika_dtm_check_fan(fpga);
260
261 set_current_state(TASK_INTERRUPTIBLE);
262 schedule_timeout(HZ);
263 }
264
265 return 0;
266 }
267
pika_dtm_start(void)268 static int __init pika_dtm_start(void)
269 {
270 struct task_struct *dtm_thread;
271 struct device_node *np;
272
273 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
274 if (np == NULL)
275 return -ENOENT;
276
277 dtm_fpga = of_iomap(np, 0);
278 of_node_put(np);
279 if (dtm_fpga == NULL)
280 return -ENOENT;
281
282 /* Must get post info before thread starts. */
283 warp_post_info();
284
285 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
286 if (IS_ERR(dtm_thread)) {
287 iounmap(dtm_fpga);
288 return PTR_ERR(dtm_thread);
289 }
290
291 return 0;
292 }
293 machine_late_initcall(warp, pika_dtm_start);
294
295 #else /* !CONFIG_SENSORS_AD7414 */
296
pika_dtm_register_shutdown(void (* func)(void * arg),void * arg)297 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
298 {
299 return 0;
300 }
301
pika_dtm_unregister_shutdown(void (* func)(void * arg),void * arg)302 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
303 {
304 return 0;
305 }
306
307 machine_late_initcall(warp, warp_post_info);
308
309 #endif
310
311 EXPORT_SYMBOL(pika_dtm_register_shutdown);
312 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
313
