320 lines
6.4 KiB
C
320 lines
6.4 KiB
C
/*
|
|
* PIKA Warp(tm) board specific routines
|
|
*
|
|
* Copyright (c) 2008-2009 PIKA Technologies
|
|
* Sean MacLennan <smaclennan@pikatech.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/of_i2c.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/udbg.h>
|
|
#include <asm/time.h>
|
|
#include <asm/uic.h>
|
|
#include <asm/ppc4xx.h>
|
|
|
|
|
|
static __initdata struct of_device_id warp_of_bus[] = {
|
|
{ .compatible = "ibm,plb4", },
|
|
{ .compatible = "ibm,opb", },
|
|
{ .compatible = "ibm,ebc", },
|
|
{},
|
|
};
|
|
|
|
static int __init warp_device_probe(void)
|
|
{
|
|
of_platform_bus_probe(NULL, warp_of_bus, NULL);
|
|
return 0;
|
|
}
|
|
machine_device_initcall(warp, warp_device_probe);
|
|
|
|
static int __init warp_probe(void)
|
|
{
|
|
unsigned long root = of_get_flat_dt_root();
|
|
|
|
if (!of_flat_dt_is_compatible(root, "pika,warp"))
|
|
return 0;
|
|
|
|
/* For __dma_alloc_coherent */
|
|
ISA_DMA_THRESHOLD = ~0L;
|
|
|
|
return 1;
|
|
}
|
|
|
|
define_machine(warp) {
|
|
.name = "Warp",
|
|
.probe = warp_probe,
|
|
.progress = udbg_progress,
|
|
.init_IRQ = uic_init_tree,
|
|
.get_irq = uic_get_irq,
|
|
.restart = ppc4xx_reset_system,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
};
|
|
|
|
|
|
static int __init warp_post_info(void)
|
|
{
|
|
struct device_node *np;
|
|
void __iomem *fpga;
|
|
u32 post1, post2;
|
|
|
|
/* Sighhhh... POST information is in the sd area. */
|
|
np = of_find_compatible_node(NULL, NULL, "pika,fpga-sd");
|
|
if (np == NULL)
|
|
return -ENOENT;
|
|
|
|
fpga = of_iomap(np, 0);
|
|
of_node_put(np);
|
|
if (fpga == NULL)
|
|
return -ENOENT;
|
|
|
|
post1 = in_be32(fpga + 0x40);
|
|
post2 = in_be32(fpga + 0x44);
|
|
|
|
iounmap(fpga);
|
|
|
|
if (post1 || post2)
|
|
printk(KERN_INFO "Warp POST %08x %08x\n", post1, post2);
|
|
else
|
|
printk(KERN_INFO "Warp POST OK\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SENSORS_AD7414
|
|
|
|
static LIST_HEAD(dtm_shutdown_list);
|
|
static void __iomem *dtm_fpga;
|
|
static unsigned green_led, red_led;
|
|
|
|
|
|
struct dtm_shutdown {
|
|
struct list_head list;
|
|
void (*func)(void *arg);
|
|
void *arg;
|
|
};
|
|
|
|
|
|
int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
|
|
{
|
|
struct dtm_shutdown *shutdown;
|
|
|
|
shutdown = kmalloc(sizeof(struct dtm_shutdown), GFP_KERNEL);
|
|
if (shutdown == NULL)
|
|
return -ENOMEM;
|
|
|
|
shutdown->func = func;
|
|
shutdown->arg = arg;
|
|
|
|
list_add(&shutdown->list, &dtm_shutdown_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
|
|
{
|
|
struct dtm_shutdown *shutdown;
|
|
|
|
list_for_each_entry(shutdown, &dtm_shutdown_list, list)
|
|
if (shutdown->func == func && shutdown->arg == arg) {
|
|
list_del(&shutdown->list);
|
|
kfree(shutdown);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static irqreturn_t temp_isr(int irq, void *context)
|
|
{
|
|
struct dtm_shutdown *shutdown;
|
|
int value = 1;
|
|
|
|
local_irq_disable();
|
|
|
|
gpio_set_value(green_led, 0);
|
|
|
|
/* Run through the shutdown list. */
|
|
list_for_each_entry(shutdown, &dtm_shutdown_list, list)
|
|
shutdown->func(shutdown->arg);
|
|
|
|
printk(KERN_EMERG "\n\nCritical Temperature Shutdown\n\n");
|
|
|
|
while (1) {
|
|
if (dtm_fpga) {
|
|
unsigned reset = in_be32(dtm_fpga + 0x14);
|
|
out_be32(dtm_fpga + 0x14, reset);
|
|
}
|
|
|
|
gpio_set_value(red_led, value);
|
|
value ^= 1;
|
|
mdelay(500);
|
|
}
|
|
|
|
/* Not reached */
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int pika_setup_leds(void)
|
|
{
|
|
struct device_node *np, *child;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "gpio-leds");
|
|
if (!np) {
|
|
printk(KERN_ERR __FILE__ ": Unable to find leds\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
for_each_child_of_node(np, child)
|
|
if (strcmp(child->name, "green") == 0)
|
|
green_led = of_get_gpio(child, 0);
|
|
else if (strcmp(child->name, "red") == 0)
|
|
red_led = of_get_gpio(child, 0);
|
|
|
|
of_node_put(np);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pika_setup_critical_temp(struct device_node *np,
|
|
struct i2c_client *client)
|
|
{
|
|
int irq, rc;
|
|
|
|
/* Do this before enabling critical temp interrupt since we
|
|
* may immediately interrupt.
|
|
*/
|
|
pika_setup_leds();
|
|
|
|
/* These registers are in 1 degree increments. */
|
|
i2c_smbus_write_byte_data(client, 2, 65); /* Thigh */
|
|
i2c_smbus_write_byte_data(client, 3, 0); /* Tlow */
|
|
|
|
irq = irq_of_parse_and_map(np, 0);
|
|
if (irq == NO_IRQ) {
|
|
printk(KERN_ERR __FILE__ ": Unable to get ad7414 irq\n");
|
|
return;
|
|
}
|
|
|
|
rc = request_irq(irq, temp_isr, 0, "ad7414", NULL);
|
|
if (rc) {
|
|
printk(KERN_ERR __FILE__
|
|
": Unable to request ad7414 irq %d = %d\n", irq, rc);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static inline void pika_dtm_check_fan(void __iomem *fpga)
|
|
{
|
|
static int fan_state;
|
|
u32 fan = in_be32(fpga + 0x34) & (1 << 14);
|
|
|
|
if (fan_state != fan) {
|
|
fan_state = fan;
|
|
if (fan)
|
|
printk(KERN_WARNING "Fan rotation error detected."
|
|
" Please check hardware.\n");
|
|
}
|
|
}
|
|
|
|
static int pika_dtm_thread(void __iomem *fpga)
|
|
{
|
|
struct device_node *np;
|
|
struct i2c_client *client;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
|
|
if (np == NULL)
|
|
return -ENOENT;
|
|
|
|
client = of_find_i2c_device_by_node(np);
|
|
if (client == NULL) {
|
|
of_node_put(np);
|
|
return -ENOENT;
|
|
}
|
|
|
|
pika_setup_critical_temp(np, client);
|
|
|
|
of_node_put(np);
|
|
|
|
printk(KERN_INFO "Warp DTM thread running.\n");
|
|
|
|
while (!kthread_should_stop()) {
|
|
int val;
|
|
|
|
val = i2c_smbus_read_word_data(client, 0);
|
|
if (val < 0)
|
|
dev_dbg(&client->dev, "DTM read temp failed.\n");
|
|
else {
|
|
s16 temp = swab16(val);
|
|
out_be32(fpga + 0x20, temp);
|
|
}
|
|
|
|
pika_dtm_check_fan(fpga);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init pika_dtm_start(void)
|
|
{
|
|
struct task_struct *dtm_thread;
|
|
struct device_node *np;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "pika,fpga");
|
|
if (np == NULL)
|
|
return -ENOENT;
|
|
|
|
dtm_fpga = of_iomap(np, 0);
|
|
of_node_put(np);
|
|
if (dtm_fpga == NULL)
|
|
return -ENOENT;
|
|
|
|
/* Must get post info before thread starts. */
|
|
warp_post_info();
|
|
|
|
dtm_thread = kthread_run(pika_dtm_thread, dtm_fpga, "pika-dtm");
|
|
if (IS_ERR(dtm_thread)) {
|
|
iounmap(dtm_fpga);
|
|
return PTR_ERR(dtm_thread);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
machine_late_initcall(warp, pika_dtm_start);
|
|
|
|
#else /* !CONFIG_SENSORS_AD7414 */
|
|
|
|
int pika_dtm_register_shutdown(void (*func)(void *arg), void *arg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int pika_dtm_unregister_shutdown(void (*func)(void *arg), void *arg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
machine_late_initcall(warp, warp_post_info);
|
|
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(pika_dtm_register_shutdown);
|
|
EXPORT_SYMBOL(pika_dtm_unregister_shutdown);
|