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warp.c

/*
 * PIKA Warp(tm) board specific routines
 *
 * Copyright (c) 2008 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 <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();

      return of_flat_dt_is_compatible(root, "pika,warp");
}

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,
};


/* I am not sure this is the best place for this... */
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;
}
machine_late_initcall(warp, warp_post_info);


#ifdef CONFIG_SENSORS_AD7414

static LIST_HEAD(dtm_shutdown_list);
static void __iomem *dtm_fpga;
static void __iomem *gpio_base;


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;

      local_irq_disable();

      /* 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");

      while (1) {
            if (dtm_fpga) {
                  unsigned reset = in_be32(dtm_fpga + 0x14);
                  out_be32(dtm_fpga + 0x14, reset);
            }

            if (gpio_base) {
                  unsigned leds = in_be32(gpio_base);

                  /* green off, red toggle */
                  leds &= ~0x80000000;
                  leds ^=  0x40000000;

                  out_be32(gpio_base, leds);
            }

            mdelay(500);
      }
}

static int pika_setup_leds(void)
{
      struct device_node *np;
      const u32 *gpios;
      int len;

      np = of_find_compatible_node(NULL, NULL, "linux,gpio-led");
      if (!np) {
            printk(KERN_ERR __FILE__ ": Unable to find gpio-led\n");
            return -ENOENT;
      }

      gpios = of_get_property(np, "gpios", &len);
      of_node_put(np);
      if (!gpios || len < 4) {
            printk(KERN_ERR __FILE__
                   ": Unable to get gpios property (%d)\n", len);
            return -ENOENT;
      }

      np = of_find_node_by_phandle(gpios[0]);
      if (!np) {
            printk(KERN_ERR __FILE__ ": Unable to find gpio\n");
            return -ENOENT;
      }

      gpio_base = of_iomap(np, 0);
      of_node_put(np);
      if (!gpio_base) {
            printk(KERN_ERR __FILE__ ": Unable to map gpio");
            return -ENOMEM;
      }

      return 0;
}

static void pika_setup_critical_temp(struct i2c_client *client)
{
      struct device_node *np;
      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 */

      np = of_find_compatible_node(NULL, NULL, "adi,ad7414");
      if (np == NULL) {
            printk(KERN_ERR __FILE__ ": Unable to find ad7414\n");
            return;
      }

      irq = irq_of_parse_and_map(np, 0);
      of_node_put(np);
      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 i2c_adapter *adap;
      struct i2c_client *client;

      /* We loop in case either driver was compiled as a module and
       * has not been insmoded yet.
       */
      while (!(adap = i2c_get_adapter(0))) {
            set_current_state(TASK_INTERRUPTIBLE);
            schedule_timeout(HZ);
      }

      while (1) {
            list_for_each_entry(client, &adap->clients, list)
                  if (client->addr == 0x4a)
                        goto found_it;

            set_current_state(TASK_INTERRUPTIBLE);
            schedule_timeout(HZ);
      }

found_it:
      i2c_put_adapter(adap);

      pika_setup_critical_temp(client);

      printk(KERN_INFO "PIKA 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;

      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;
}

#endif

EXPORT_SYMBOL(pika_dtm_register_shutdown);
EXPORT_SYMBOL(pika_dtm_unregister_shutdown);

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