Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/arch/powerpc/platforms/44x/warp.c

  1 /*
  2  * PIKA Warp(tm) board specific routines
  3  *
  4  * Copyright (c) 2008-2009 PIKA Technologies
  5  *   Sean MacLennan <smaclennan@pikatech.com>
  6  *
  7  * This program is free software; you can redistribute  it and/or modify it
  8  * under  the terms of  the GNU General  Public License as published by the
  9  * Free Software Foundation;  either version 2 of the  License, or (at your
 10  * option) any later version.
 11  */
 12 #include <linux/init.h>
 13 #include <linux/of_platform.h>
 14 #include <linux/kthread.h>
 15 #include <linux/i2c.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/delay.h>
 18 #include <linux/of_gpio.h>
 19 #include <linux/slab.h>
 20 #include <linux/export.h>
 21 
 22 #include <asm/machdep.h>
 23 #include <asm/prom.h>
 24 #include <asm/udbg.h>
 25 #include <asm/time.h>
 26 #include <asm/uic.h>
 27 #include <asm/ppc4xx.h>
 28 #include <asm/dma.h>
 29 
 30 
 31 static const struct of_device_id warp_of_bus[] __initconst = {
 32         { .compatible = "ibm,plb4", },
 33         { .compatible = "ibm,opb", },
 34         { .compatible = "ibm,ebc", },
 35         {},
 36 };
 37 
 38 static int __init warp_device_probe(void)
 39 {
 40         of_platform_bus_probe(NULL, warp_of_bus, NULL);
 41         return 0;
 42 }
 43 machine_device_initcall(warp, warp_device_probe);
 44 
 45 static int __init warp_probe(void)
 46 {
 47         unsigned long root = of_get_flat_dt_root();
 48 
 49         if (!of_flat_dt_is_compatible(root, "pika,warp"))
 50                 return 0;
 51 
 52         /* For __dma_alloc_coherent */
 53         ISA_DMA_THRESHOLD = ~0L;
 54 
 55         return 1;
 56 }
 57 
 58 define_machine(warp) {
 59         .name           = "Warp",
 60         .probe          = warp_probe,
 61         .progress       = udbg_progress,
 62         .init_IRQ       = uic_init_tree,
 63         .get_irq        = uic_get_irq,
 64         .restart        = ppc4xx_reset_system,
 65         .calibrate_decr = generic_calibrate_decr,
 66 };
 67 
 68 
 69 static int __init warp_post_info(void)
 70 {
 71         struct device_node *np;
 72         void __iomem *fpga;
 73         u32 post1, post2;
 74 
 75         /* Sighhhh... POST information is in the sd area. */
 76         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
 77         if (np == NULL)
 78                 return -ENOENT;
 79 
 80         fpga = of_iomap(np, 0);
 81         of_node_put(np);
 82         if (fpga == NULL)
 83                 return -ENOENT;
 84 
 85         post1 = in_be32(fpga + 0x40);
 86         post2 = in_be32(fpga + 0x44);
 87 
 88         iounmap(fpga);
 89 
 90         if (post1 || post2)
 91                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
 92         else
 93                 printk(KERN_INFO "Warp POST OK\n");
 94 
 95         return 0;
 96 }
 97 
 98 
 99 #ifdef CONFIG_SENSORS_AD7414
100 
101 static LIST_HEAD(dtm_shutdown_list);
102 static void __iomem *dtm_fpga;
103 static unsigned green_led, red_led;
104 
105 
106 struct dtm_shutdown {
107         struct list_head list;
108         void (*func)(void *arg);
109         void *arg;
110 };
111 
112 
113 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
114 {
115         struct dtm_shutdown *shutdown;
116 
117         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
118         if (shutdown == NULL)
119                 return -ENOMEM;
120 
121         shutdown->func = func;
122         shutdown->arg = arg;
123 
124         list_add(&shutdown->list, &dtm_shutdown_list);
125 
126         return 0;
127 }
128 
129 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
130 {
131         struct dtm_shutdown *shutdown;
132 
133         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
134                 if (shutdown->func == func && shutdown->arg == arg) {
135                         list_del(&shutdown->list);
136                         kfree(shutdown);
137                         return 0;
138                 }
139 
140         return -EINVAL;
141 }
142 
143 static irqreturn_t temp_isr(int irq, void *context)
144 {
145         struct dtm_shutdown *shutdown;
146         int value = 1;
147 
148         local_irq_disable();
149 
150         gpio_set_value(green_led, 0);
151 
152         /* Run through the shutdown list. */
153         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
154                 shutdown->func(shutdown->arg);
155 
156         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
157 
158         while (1) {
159                 if (dtm_fpga) {
160                         unsigned reset = in_be32(dtm_fpga + 0x14);
161                         out_be32(dtm_fpga + 0x14, reset);
162                 }
163 
164                 gpio_set_value(red_led, value);
165                 value ^= 1;
166                 mdelay(500);
167         }
168 
169         /* Not reached */
170         return IRQ_HANDLED;
171 }
172 
173 static int pika_setup_leds(void)
174 {
175         struct device_node *np, *child;
176 
177         np = of_find_compatible_node(NULL, NULL, "gpio-leds");
178         if (!np) {
179                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
180                 return -ENOENT;
181         }
182 
183         for_each_child_of_node(np, child)
184                 if (strcmp(child->name, "green") == 0)
185                         green_led = of_get_gpio(child, 0);
186                 else if (strcmp(child->name, "red") == 0)
187                         red_led = of_get_gpio(child, 0);
188 
189         of_node_put(np);
190 
191         return 0;
192 }
193 
194 static void pika_setup_critical_temp(struct device_node *np,
195                                      struct i2c_client *client)
196 {
197         int irq, rc;
198 
199         /* Do this before enabling critical temp interrupt since we
200          * may immediately interrupt.
201          */
202         pika_setup_leds();
203 
204         /* These registers are in 1 degree increments. */
205         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
206         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
207 
208         irq = irq_of_parse_and_map(np, 0);
209         if (irq  == NO_IRQ) {
210                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
211                 return;
212         }
213 
214         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
215         if (rc) {
216                 printk(KERN_ERR __FILE__
217                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
218                 return;
219         }
220 }
221 
222 static inline void pika_dtm_check_fan(void __iomem *fpga)
223 {
224         static int fan_state;
225         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
226 
227         if (fan_state != fan) {
228                 fan_state = fan;
229                 if (fan)
230                         printk(KERN_WARNING "Fan rotation error detected."
231                                    " Please check hardware.\n");
232         }
233 }
234 
235 static int pika_dtm_thread(void __iomem *fpga)
236 {
237         struct device_node *np;
238         struct i2c_client *client;
239 
240         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
241         if (np == NULL)
242                 return -ENOENT;
243 
244         client = of_find_i2c_device_by_node(np);
245         if (client == NULL) {
246                 of_node_put(np);
247                 return -ENOENT;
248         }
249 
250         pika_setup_critical_temp(np, client);
251 
252         of_node_put(np);
253 
254         printk(KERN_INFO "Warp DTM thread running.\n");
255 
256         while (!kthread_should_stop()) {
257                 int val;
258 
259                 val = i2c_smbus_read_word_data(client, 0);
260                 if (val < 0)
261                         dev_dbg(&client->dev, "DTM read temp failed.\n");
262                 else {
263                         s16 temp = swab16(val);
264                         out_be32(fpga + 0x20, temp);
265                 }
266 
267                 pika_dtm_check_fan(fpga);
268 
269                 set_current_state(TASK_INTERRUPTIBLE);
270                 schedule_timeout(HZ);
271         }
272 
273         return 0;
274 }
275 
276 static int __init pika_dtm_start(void)
277 {
278         struct task_struct *dtm_thread;
279         struct device_node *np;
280 
281         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
282         if (np == NULL)
283                 return -ENOENT;
284 
285         dtm_fpga = of_iomap(np, 0);
286         of_node_put(np);
287         if (dtm_fpga == NULL)
288                 return -ENOENT;
289 
290         /* Must get post info before thread starts. */
291         warp_post_info();
292 
293         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
294         if (IS_ERR(dtm_thread)) {
295                 iounmap(dtm_fpga);
296                 return PTR_ERR(dtm_thread);
297         }
298 
299         return 0;
300 }
301 machine_late_initcall(warp, pika_dtm_start);
302 
303 #else /* !CONFIG_SENSORS_AD7414 */
304 
305 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
306 {
307         return 0;
308 }
309 
310 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
311 {
312         return 0;
313 }
314 
315 machine_late_initcall(warp, warp_post_info);
316 
317 #endif
318 
319 EXPORT_SYMBOL(pika_dtm_register_shutdown);
320 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
321 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us