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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         if (!of_machine_is_compatible("pika,warp"))
 48                 return 0;
 49 
 50         /* For __dma_alloc_coherent */
 51         ISA_DMA_THRESHOLD = ~0L;
 52 
 53         return 1;
 54 }
 55 
 56 define_machine(warp) {
 57         .name           = "Warp",
 58         .probe          = warp_probe,
 59         .progress       = udbg_progress,
 60         .init_IRQ       = uic_init_tree,
 61         .get_irq        = uic_get_irq,
 62         .restart        = ppc4xx_reset_system,
 63         .calibrate_decr = generic_calibrate_decr,
 64 };
 65 
 66 
 67 static int __init warp_post_info(void)
 68 {
 69         struct device_node *np;
 70         void __iomem *fpga;
 71         u32 post1, post2;
 72 
 73         /* Sighhhh... POST information is in the sd area. */
 74         np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
 75         if (np == NULL)
 76                 return -ENOENT;
 77 
 78         fpga = of_iomap(np, 0);
 79         of_node_put(np);
 80         if (fpga == NULL)
 81                 return -ENOENT;
 82 
 83         post1 = in_be32(fpga + 0x40);
 84         post2 = in_be32(fpga + 0x44);
 85 
 86         iounmap(fpga);
 87 
 88         if (post1 || post2)
 89                 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
 90         else
 91                 printk(KERN_INFO "Warp POST OK\n");
 92 
 93         return 0;
 94 }
 95 
 96 
 97 #ifdef CONFIG_SENSORS_AD7414
 98 
 99 static LIST_HEAD(dtm_shutdown_list);
100 static void __iomem *dtm_fpga;
101 static unsigned green_led, red_led;
102 
103 
104 struct dtm_shutdown {
105         struct list_head list;
106         void (*func)(void *arg);
107         void *arg;
108 };
109 
110 
111 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
112 {
113         struct dtm_shutdown *shutdown;
114 
115         shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
116         if (shutdown == NULL)
117                 return -ENOMEM;
118 
119         shutdown->func = func;
120         shutdown->arg = arg;
121 
122         list_add(&shutdown->list, &dtm_shutdown_list);
123 
124         return 0;
125 }
126 
127 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
128 {
129         struct dtm_shutdown *shutdown;
130 
131         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
132                 if (shutdown->func == func && shutdown->arg == arg) {
133                         list_del(&shutdown->list);
134                         kfree(shutdown);
135                         return 0;
136                 }
137 
138         return -EINVAL;
139 }
140 
141 static irqreturn_t temp_isr(int irq, void *context)
142 {
143         struct dtm_shutdown *shutdown;
144         int value = 1;
145 
146         local_irq_disable();
147 
148         gpio_set_value(green_led, 0);
149 
150         /* Run through the shutdown list. */
151         list_for_each_entry(shutdown, &dtm_shutdown_list, list)
152                 shutdown->func(shutdown->arg);
153 
154         printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
155 
156         while (1) {
157                 if (dtm_fpga) {
158                         unsigned reset = in_be32(dtm_fpga + 0x14);
159                         out_be32(dtm_fpga + 0x14, reset);
160                 }
161 
162                 gpio_set_value(red_led, value);
163                 value ^= 1;
164                 mdelay(500);
165         }
166 
167         /* Not reached */
168         return IRQ_HANDLED;
169 }
170 
171 static int pika_setup_leds(void)
172 {
173         struct device_node *np, *child;
174 
175         np = of_find_compatible_node(NULL, NULL, "gpio-leds");
176         if (!np) {
177                 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
178                 return -ENOENT;
179         }
180 
181         for_each_child_of_node(np, child)
182                 if (strcmp(child->name, "green") == 0)
183                         green_led = of_get_gpio(child, 0);
184                 else if (strcmp(child->name, "red") == 0)
185                         red_led = of_get_gpio(child, 0);
186 
187         of_node_put(np);
188 
189         return 0;
190 }
191 
192 static void pika_setup_critical_temp(struct device_node *np,
193                                      struct i2c_client *client)
194 {
195         int irq, rc;
196 
197         /* Do this before enabling critical temp interrupt since we
198          * may immediately interrupt.
199          */
200         pika_setup_leds();
201 
202         /* These registers are in 1 degree increments. */
203         i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
204         i2c_smbus_write_byte_data(client, 3,  0); /* Tlow */
205 
206         irq = irq_of_parse_and_map(np, 0);
207         if (irq  == NO_IRQ) {
208                 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
209                 return;
210         }
211 
212         rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
213         if (rc) {
214                 printk(KERN_ERR __FILE__
215                        ": Unable to request ad7414 irq %d = %d\n", irq, rc);
216                 return;
217         }
218 }
219 
220 static inline void pika_dtm_check_fan(void __iomem *fpga)
221 {
222         static int fan_state;
223         u32 fan = in_be32(fpga + 0x34) & (1 << 14);
224 
225         if (fan_state != fan) {
226                 fan_state = fan;
227                 if (fan)
228                         printk(KERN_WARNING "Fan rotation error detected."
229                                    " Please check hardware.\n");
230         }
231 }
232 
233 static int pika_dtm_thread(void __iomem *fpga)
234 {
235         struct device_node *np;
236         struct i2c_client *client;
237 
238         np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
239         if (np == NULL)
240                 return -ENOENT;
241 
242         client = of_find_i2c_device_by_node(np);
243         if (client == NULL) {
244                 of_node_put(np);
245                 return -ENOENT;
246         }
247 
248         pika_setup_critical_temp(np, client);
249 
250         of_node_put(np);
251 
252         printk(KERN_INFO "Warp DTM thread running.\n");
253 
254         while (!kthread_should_stop()) {
255                 int val;
256 
257                 val = i2c_smbus_read_word_data(client, 0);
258                 if (val < 0)
259                         dev_dbg(&client->dev, "DTM read temp failed.\n");
260                 else {
261                         s16 temp = swab16(val);
262                         out_be32(fpga + 0x20, temp);
263                 }
264 
265                 pika_dtm_check_fan(fpga);
266 
267                 set_current_state(TASK_INTERRUPTIBLE);
268                 schedule_timeout(HZ);
269         }
270 
271         return 0;
272 }
273 
274 static int __init pika_dtm_start(void)
275 {
276         struct task_struct *dtm_thread;
277         struct device_node *np;
278 
279         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
280         if (np == NULL)
281                 return -ENOENT;
282 
283         dtm_fpga = of_iomap(np, 0);
284         of_node_put(np);
285         if (dtm_fpga == NULL)
286                 return -ENOENT;
287 
288         /* Must get post info before thread starts. */
289         warp_post_info();
290 
291         dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
292         if (IS_ERR(dtm_thread)) {
293                 iounmap(dtm_fpga);
294                 return PTR_ERR(dtm_thread);
295         }
296 
297         return 0;
298 }
299 machine_late_initcall(warp, pika_dtm_start);
300 
301 #else /* !CONFIG_SENSORS_AD7414 */
302 
303 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
304 {
305         return 0;
306 }
307 
308 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
309 {
310         return 0;
311 }
312 
313 machine_late_initcall(warp, warp_post_info);
314 
315 #endif
316 
317 EXPORT_SYMBOL(pika_dtm_register_shutdown);
318 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
319 

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