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>
21 #include <linux/export.h>
23 #include <asm/machdep.h>
28 #include <asm/ppc4xx.h>
31 static __initdata struct of_device_id warp_of_bus[] = {
32 { .compatible = "ibm,plb4", },
33 { .compatible = "ibm,opb", },
34 { .compatible = "ibm,ebc", },
38 static int __init warp_device_probe(void)
40 of_platform_bus_probe(NULL, warp_of_bus, NULL);
43 machine_device_initcall(warp, warp_device_probe);
45 static int __init warp_probe(void)
47 unsigned long root = of_get_flat_dt_root();
49 if (!of_flat_dt_is_compatible(root, "pika,warp"))
52 /* For __dma_alloc_coherent */
53 ISA_DMA_THRESHOLD = ~0L;
58 define_machine(warp) {
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,
69 static int __init warp_post_info(void)
71 struct device_node *np;
75 /* Sighhhh... POST information is in the sd area. */
76 np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
80 fpga = of_iomap(np, 0);
85 post1 = in_be32(fpga + 0x40);
86 post2 = in_be32(fpga + 0x44);
91 printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
93 printk(KERN_INFO "Warp POST OK\n");
99 #ifdef CONFIG_SENSORS_AD7414
101 static LIST_HEAD(dtm_shutdown_list);
102 static void __iomem *dtm_fpga;
103 static unsigned green_led, red_led;
106 struct dtm_shutdown {
107 struct list_head list;
108 void (*func)(void *arg);
113 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
115 struct dtm_shutdown *shutdown;
117 shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
118 if (shutdown == NULL)
121 shutdown->func = func;
124 list_add(&shutdown->list, &dtm_shutdown_list);
129 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
131 struct dtm_shutdown *shutdown;
133 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
134 if (shutdown->func == func && shutdown->arg == arg) {
135 list_del(&shutdown->list);
143 static irqreturn_t temp_isr(int irq, void *context)
145 struct dtm_shutdown *shutdown;
150 gpio_set_value(green_led, 0);
152 /* Run through the shutdown list. */
153 list_for_each_entry(shutdown, &dtm_shutdown_list, list)
154 shutdown->func(shutdown->arg);
156 printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
160 unsigned reset = in_be32(dtm_fpga + 0x14);
161 out_be32(dtm_fpga + 0x14, reset);
164 gpio_set_value(red_led, value);
173 static int pika_setup_leds(void)
175 struct device_node *np, *child;
177 np = of_find_compatible_node(NULL, NULL, "gpio-leds");
179 printk(KERN_ERR __FILE__ ": Unable to find leds\n");
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);
194 static void pika_setup_critical_temp(struct device_node *np,
195 struct i2c_client *client)
199 /* Do this before enabling critical temp interrupt since we
200 * may immediately interrupt.
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 */
208 irq = irq_of_parse_and_map(np, 0);
210 printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
214 rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
216 printk(KERN_ERR __FILE__
217 ": Unable to request ad7414 irq %d = %d\n", irq, rc);
222 static inline void pika_dtm_check_fan(void __iomem *fpga)
224 static int fan_state;
225 u32 fan = in_be32(fpga + 0x34) & (1 << 14);
227 if (fan_state != fan) {
230 printk(KERN_WARNING "Fan rotation error detected."
231 " Please check hardware.\n");
235 static int pika_dtm_thread(void __iomem *fpga)
237 struct device_node *np;
238 struct i2c_client *client;
240 np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
244 client = of_find_i2c_device_by_node(np);
245 if (client == NULL) {
250 pika_setup_critical_temp(np, client);
254 printk(KERN_INFO "Warp DTM thread running.\n");
256 while (!kthread_should_stop()) {
259 val = i2c_smbus_read_word_data(client, 0);
261 dev_dbg(&client->dev, "DTM read temp failed.\n");
263 s16 temp = swab16(val);
264 out_be32(fpga + 0x20, temp);
267 pika_dtm_check_fan(fpga);
269 set_current_state(TASK_INTERRUPTIBLE);
270 schedule_timeout(HZ);
276 static int __init pika_dtm_start(void)
278 struct task_struct *dtm_thread;
279 struct device_node *np;
281 np = of_find_compatible_node(NULL, NULL, "pika,fpga");
285 dtm_fpga = of_iomap(np, 0);
287 if (dtm_fpga == NULL)
290 /* Must get post info before thread starts. */
293 dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
294 if (IS_ERR(dtm_thread)) {
296 return PTR_ERR(dtm_thread);
301 machine_late_initcall(warp, pika_dtm_start);
303 #else /* !CONFIG_SENSORS_AD7414 */
305 int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
310 int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
315 machine_late_initcall(warp, warp_post_info);
319 EXPORT_SYMBOL(pika_dtm_register_shutdown);
320 EXPORT_SYMBOL(pika_dtm_unregister_shutdown);