2 * PIKA Warp(tm) board specific routines
4 * Copyright (c) 2008-2009 PIKA Technologies
5 * Sean MacLennan <smaclennan@pikatech.com>
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.
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/of_i2c.h>
20 #include <linux/slab.h>
22 #include <asm/machdep.h>
27 #include <asm/ppc4xx.h>
30 static __initdata struct of_device_id warp_of_bus[] = {
31 { .compatible = "ibm,plb4", },
32 { .compatible = "ibm,opb", },
33 { .compatible = "ibm,ebc", },
37 static int __init warp_device_probe(void)
39 of_platform_bus_probe(NULL, warp_of_bus, NULL);
42 machine_device_initcall(warp, warp_device_probe);
44 static int __init warp_probe(void)
46 unsigned long root = of_get_flat_dt_root();
48 if (!of_flat_dt_is_compatible(root, "pika,warp"))
51 /* For __dma_alloc_coherent */
52 ISA_DMA_THRESHOLD = ~0L;
57 define_machine(warp) {
60 .progress = udbg_progress,
61 .init_IRQ = uic_init_tree,
62 .get_irq = uic_get_irq,
63 .restart = ppc4xx_reset_system,
64 .calibrate_decr = generic_calibrate_decr,
68 static int __init warp_post_info(void)
70 struct device_node *np;
74 /* Sighhhh... POST information is in the sd area. */
75 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
79 fpga = of_iomap(np, 0);
84 post1 = in_be32(fpga + 0x40);
85 post2 = in_be32(fpga + 0x44);
90 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
92 printk(KERN_INFO "Warp POST OK\n");
98 #ifdef CONFIG_SENSORS_AD7414
100 static LIST_HEAD(dtm_shutdown_list);
101 static void __iomem *dtm_fpga;
102 static unsigned green_led, red_led;
105 struct dtm_shutdown {
106 struct list_head list;
107 void (*func)(void *arg);
112 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
114 struct dtm_shutdown *shutdown;
116 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
117 if (shutdown == NULL)
120 shutdown->func = func;
123 list_add(&shutdown->list, &dtm_shutdown_list);
128 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
130 struct dtm_shutdown *shutdown;
132 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
133 if (shutdown->func == func && shutdown->arg == arg) {
134 list_del(&shutdown->list);
142 static irqreturn_t temp_isr(int irq, void *context)
144 struct dtm_shutdown *shutdown;
149 gpio_set_value(green_led, 0);
151 /* Run through the shutdown list. */
152 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
153 shutdown->func(shutdown->arg);
155 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
159 unsigned reset = in_be32(dtm_fpga + 0x14);
160 out_be32(dtm_fpga + 0x14, reset);
163 gpio_set_value(red_led, value);
172 static int pika_setup_leds(void)
174 struct device_node *np, *child;
176 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
178 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
182 for_each_child_of_node(np, child)
183 if (strcmp(child->name, "green") == 0)
184 green_led = of_get_gpio(child, 0);
185 else if (strcmp(child->name, "red") == 0)
186 red_led = of_get_gpio(child, 0);
193 static void pika_setup_critical_temp(struct device_node *np,
194 struct i2c_client *client)
198 /* Do this before enabling critical temp interrupt since we
199 * may immediately interrupt.
203 /* These registers are in 1 degree increments. */
204 i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
205 i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
207 irq = irq_of_parse_and_map(np, 0);
209 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
213 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
215 printk(KERN_ERR __FILE__
216 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
221 static inline void pika_dtm_check_fan(void __iomem *fpga)
223 static int fan_state;
224 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
226 if (fan_state != fan) {
229 printk(KERN_WARNING "Fan rotation error detected."
230 " Please check hardware.\n");
234 static int pika_dtm_thread(void __iomem *fpga)
236 struct device_node *np;
237 struct i2c_client *client;
239 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
243 client = of_find_i2c_device_by_node(np);
244 if (client == NULL) {
249 pika_setup_critical_temp(np, client);
253 printk(KERN_INFO "Warp DTM thread running.\n");
255 while (!kthread_should_stop()) {
258 val = i2c_smbus_read_word_data(client, 0);
260 dev_dbg(&client->dev, "DTM read temp failed.\n");
262 s16 temp = swab16(val);
263 out_be32(fpga + 0x20, temp);
266 pika_dtm_check_fan(fpga);
268 set_current_state(TASK_INTERRUPTIBLE);
269 schedule_timeout(HZ);
275 static int __init pika_dtm_start(void)
277 struct task_struct *dtm_thread;
278 struct device_node *np;
280 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
284 dtm_fpga = of_iomap(np, 0);
286 if (dtm_fpga == NULL)
289 /* Must get post info before thread starts. */
292 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
293 if (IS_ERR(dtm_thread)) {
295 return PTR_ERR(dtm_thread);
300 machine_late_initcall(warp, pika_dtm_start);
302 #else /* !CONFIG_SENSORS_AD7414 */
304 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
309 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
314 machine_late_initcall(warp, warp_post_info);
318 EXPORT_SYMBOL(pika_dtm_register_shutdown);
319 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);