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