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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIKA Warp(tm) board specific routines
*
* Copyright (c) 2008-2009 PIKA Technologies
* Sean MacLennan <smaclennan@pikatech.com>
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/kthread.h>
#include <linux/leds.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <asm/machdep.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include <asm/uic.h>
#include <asm/ppc4xx.h>
#include <asm/dma.h>
static const struct of_device_id warp_of_bus[] __initconst = {
{ .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);
define_machine(warp) {
.name = "Warp",
.compatible = "pika,warp",
.progress = udbg_progress,
.init_IRQ = uic_init_tree,
.get_irq = uic_get_irq,
.restart = ppc4xx_reset_system,
};
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 void __iomem *dtm_fpga;
#define WARP_GREEN_LED 0
#define WARP_RED_LED 1
static struct gpio_led warp_gpio_led_pins[] = {
[WARP_GREEN_LED] = {
.name = "green",
.default_state = LEDS_DEFSTATE_KEEP,
.gpiod = NULL, /* to be filled by pika_setup_leds() */
},
[WARP_RED_LED] = {
.name = "red",
.default_state = LEDS_DEFSTATE_KEEP,
.gpiod = NULL, /* to be filled by pika_setup_leds() */
},
};
static struct gpio_led_platform_data warp_gpio_led_data = {
.leds = warp_gpio_led_pins,
.num_leds = ARRAY_SIZE(warp_gpio_led_pins),
};
static struct platform_device warp_gpio_leds = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = &warp_gpio_led_data,
},
};
static irqreturn_t temp_isr(int irq, void *context)
{
int value = 1;
local_irq_disable();
gpiod_set_value(warp_gpio_led_pins[WARP_GREEN_LED].gpiod, 0);
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);
}
gpiod_set_value(warp_gpio_led_pins[WARP_RED_LED].gpiod, value);
value ^= 1;
mdelay(500);
}
/* Not reached */
return IRQ_HANDLED;
}
/*
* Because green and red power LEDs are normally driven by leds-gpio driver,
* but in case of critical temperature shutdown we want to drive them
* ourselves, we acquire both and then create leds-gpio platform device
* ourselves, instead of doing it through device tree. This way we can still
* keep access to the gpios and use them when needed.
*/
static int pika_setup_leds(void)
{
struct device_node *np, *child;
struct gpio_desc *gpio;
struct gpio_led *led;
int led_count = 0;
int error;
int i;
np = of_find_compatible_node(NULL, NULL, "warp-power-leds");
if (!np) {
printk(KERN_ERR __FILE__ ": Unable to find leds\n");
return -ENOENT;
}
for_each_child_of_node(np, child) {
for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
led = &warp_gpio_led_pins[i];
if (!of_node_name_eq(child, led->name))
continue;
if (led->gpiod) {
printk(KERN_ERR __FILE__ ": %s led has already been defined\n",
led->name);
continue;
}
gpio = fwnode_gpiod_get_index(of_fwnode_handle(child),
NULL, 0, GPIOD_ASIS,
led->name);
error = PTR_ERR_OR_ZERO(gpio);
if (error) {
printk(KERN_ERR __FILE__ ": Failed to get %s led gpio: %d\n",
led->name, error);
of_node_put(child);
goto err_cleanup_pins;
}
led->gpiod = gpio;
led_count++;
}
}
of_node_put(np);
/* Skip device registration if no leds have been defined */
if (led_count) {
error = platform_device_register(&warp_gpio_leds);
if (error) {
printk(KERN_ERR __FILE__ ": Unable to add leds-gpio: %d\n",
error);
goto err_cleanup_pins;
}
}
return 0;
err_cleanup_pins:
for (i = 0; i < ARRAY_SIZE(warp_gpio_led_pins); i++) {
led = &warp_gpio_led_pins[i];
gpiod_put(led->gpiod);
led->gpiod = NULL;
}
return error;
}
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) {
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 */
machine_late_initcall(warp, warp_post_info);
#endif