arch/powerpc/platforms/44x/warp.c

   1 /*
   2  * PIKA Warp(tm) board specific routines
   3  *
   4  * Copyright (c) 2008 PIKA Technologies
   5  *   Sean MacLennan <smaclennan@pikatech.com>
   6  *
   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.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/kthread.h>
  15
  16 #include <asm/machdep.h>
  17 #include <asm/prom.h>
  18 #include <asm/udbg.h>
  19 #include <asm/time.h>
  20 #include <asm/uic.h>
  21
  22 #include "44x.h"
  23
  24
  25 static __initdata struct of_device_id warp_of_bus[] = {
  26         { .compatible = "ibm,plb4", },
  27         { .compatible = "ibm,opb", },
  28         { .compatible = "ibm,ebc", },
  29         {},
  30 };
  31
  32 static int __init warp_device_probe(void)
  33 {
  34         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  35         return 0;
  36 }
  37 machine_device_initcall(warp, warp_device_probe);
  38
  39 static int __init warp_probe(void)
  40 {
  41         unsigned long root = of_get_flat_dt_root();
  42
  43         return of_flat_dt_is_compatible(root, "pika,warp");
  44 }
  45
  46 define_machine(warp) {
  47         .name           = "Warp",
  48         .probe          = warp_probe,
  49         .progress       = udbg_progress,
  50         .init_IRQ       = uic_init_tree,
  51         .get_irq        = uic_get_irq,
  52         .restart        = ppc44x_reset_system,
  53         .calibrate_decr = generic_calibrate_decr,
  54 };
  55
  56
  57 #define LED_GREEN (0x80000000 >> 0)
  58 #define LED_RED   (0x80000000 >> 1)
  59
  60
  61 /* This is for the power LEDs 1 = on, 0 = off, -1 = leave alone */
  62 void warp_set_power_leds(int green, int red)
  63 {
  64         static void __iomem *gpio_base = NULL;
  65         unsigned leds;
  66
  67         if (gpio_base == NULL) {
  68                 struct device_node *np;
  69
  70                 /* Power LEDS are on the second GPIO controller */
  71                 np = of_find_compatible_node(NULL, NULL, "ibm,gpio-440EP");
  72                 if (np)
  73                         np = of_find_compatible_node(np, NULL, "ibm,gpio-440EP");
  74                 if (np == NULL) {
  75                         printk(KERN_ERR __FILE__ ": Unable to find gpio\n");
  76                         return;
  77                 }
  78
  79                 gpio_base = of_iomap(np, 0);
  80                 of_node_put(np);
  81                 if (gpio_base == NULL) {
  82                         printk(KERN_ERR __FILE__ ": Unable to map gpio");
  83                         return;
  84                 }
  85         }
  86
  87         leds = in_be32(gpio_base);
  88
  89         switch (green) {
  90         case 0: leds &= ~LED_GREEN; break;
  91         case 1: leds |=  LED_GREEN; break;
  92         }
  93         switch (red) {
  94         case 0: leds &= ~LED_RED; break;
  95         case 1: leds |=  LED_RED; break;
  96         }
  97
  98         out_be32(gpio_base, leds);
  99 }
 100 EXPORT_SYMBOL(warp_set_power_leds);
 101
 102
 103 #ifdef CONFIG_SENSORS_AD7414
 104 static int pika_dtm_thread(void __iomem *fpga)
 105 {
 106         extern int ad7414_get_temp(int index);
 107
 108         while (!kthread_should_stop()) {
 109                 int temp = ad7414_get_temp(0);
 110
 111                 out_be32(fpga, temp);
 112
 113                 set_current_state(TASK_INTERRUPTIBLE);
 114                 schedule_timeout(HZ);
 115         }
 116
 117         return 0;
 118 }
 119
 120 static int __init pika_dtm_start(void)
 121 {
 122         struct task_struct *dtm_thread;
 123         struct device_node *np;
 124         struct resource res;
 125         void __iomem *fpga;
 126
 127         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 128         if (np == NULL)
 129                 return -ENOENT;
 130
 131         /* We do not call of_iomap here since it would map in the entire
 132          * fpga space, which is over 8k.
 133          */
 134         if (of_address_to_resource(np, 0, &res)) {
 135                 of_node_put(np);
 136                 return -ENOENT;
 137         }
 138         of_node_put(np);
 139
 140         fpga = ioremap(res.start, 0x24);
 141         if (fpga == NULL)
 142                 return -ENOENT;
 143
 144         dtm_thread = kthread_run(pika_dtm_thread, fpga + 0x20, "pika-dtm");
 145         if (IS_ERR(dtm_thread)) {
 146                 iounmap(fpga);
 147                 return PTR_ERR(dtm_thread);
 148         }
 149
 150         return 0;
 151 }
 152 device_initcall(pika_dtm_start);
 153 #endif