arch/powerpc/platforms/44x/warp.c - linux - Git at Google

 /*
  * 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);
	/*
	* 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);