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 #include <asm/ppc4xx.h>
  22
  23 static __initdata struct of_device_id warp_of_bus[] = {
  24         { .compatible = "ibm,plb4", },
  25         { .compatible = "ibm,opb", },
  26         { .compatible = "ibm,ebc", },
  27         {},
  28 };
  29
  30 static int __init warp_device_probe(void)
  31 {
  32         of_platform_bus_probe(NULL, warp_of_bus, NULL);
  33         return 0;
  34 }
  35 machine_device_initcall(warp, warp_device_probe);
  36
  37 static int __init warp_probe(void)
  38 {
  39         unsigned long root = of_get_flat_dt_root();
  40
  41         return of_flat_dt_is_compatible(root, "pika,warp");
  42 }
  43
  44 define_machine(warp) {
  45         .name           = "Warp",
  46         .probe          = warp_probe,
  47         .progress       = udbg_progress,
  48         .init_IRQ       = uic_init_tree,
  49         .get_irq        = uic_get_irq,
  50         .restart        = ppc4xx_reset_system,
  51         .calibrate_decr = generic_calibrate_decr,
  52 };
  53
  54
  55 #define LED_GREEN (0x80000000 >> 0)
  56 #define LED_RED   (0x80000000 >> 1)
  57
  58
  59 /* This is for the power LEDs 1 = on, 0 = off, -1 = leave alone */
  60 void warp_set_power_leds(int green, int red)
  61 {
  62         static void __iomem *gpio_base = NULL;
  63         unsigned leds;
  64
  65         if (gpio_base == NULL) {
  66                 struct device_node *np;
  67
  68                 /* Power LEDS are on the second GPIO controller */
  69                 np = of_find_compatible_node(NULL, NULL, "ibm,gpio-440EP");
  70                 if (np)
  71                         np = of_find_compatible_node(np, NULL, "ibm,gpio-440EP");
  72                 if (np == NULL) {
  73                         printk(KERN_ERR __FILE__ ": Unable to find gpio\n");
  74                         return;
  75                 }
  76
  77                 gpio_base = of_iomap(np, 0);
  78                 of_node_put(np);
  79                 if (gpio_base == NULL) {
  80                         printk(KERN_ERR __FILE__ ": Unable to map gpio");
  81                         return;
  82                 }
  83         }
  84
  85         leds = in_be32(gpio_base);
  86
  87         switch (green) {
  88         case 0: leds &= ~LED_GREEN; break;
  89         case 1: leds |=  LED_GREEN; break;
  90         }
  91         switch (red) {
  92         case 0: leds &= ~LED_RED; break;
  93         case 1: leds |=  LED_RED; break;
  94         }
  95
  96         out_be32(gpio_base, leds);
  97 }
  98 EXPORT_SYMBOL(warp_set_power_leds);
  99
 100
 101 #ifdef CONFIG_SENSORS_AD7414
 102 static int pika_dtm_thread(void __iomem *fpga)
 103 {
 104         extern int ad7414_get_temp(int index);
 105
 106         while (!kthread_should_stop()) {
 107                 int temp = ad7414_get_temp(0);
 108
 109                 out_be32(fpga, temp);
 110
 111                 set_current_state(TASK_INTERRUPTIBLE);
 112                 schedule_timeout(HZ);
 113         }
 114
 115         return 0;
 116 }
 117
 118 static int __init pika_dtm_start(void)
 119 {
 120         struct task_struct *dtm_thread;
 121         struct device_node *np;
 122         struct resource res;
 123         void __iomem *fpga;
 124
 125         np = of_find_compatible_node(NULL, NULL, "pika,fpga");
 126         if (np == NULL)
 127                 return -ENOENT;
 128
 129         /* We do not call of_iomap here since it would map in the entire
 130          * fpga space, which is over 8k.
 131          */
 132         if (of_address_to_resource(np, 0, &res)) {
 133                 of_node_put(np);
 134                 return -ENOENT;
 135         }
 136         of_node_put(np);
 137
 138         fpga = ioremap(res.start, 0x24);
 139         if (fpga == NULL)
 140                 return -ENOENT;
 141
 142         dtm_thread = kthread_run(pika_dtm_thread, fpga + 0x20, "pika-dtm");
 143         if (IS_ERR(dtm_thread)) {
 144                 iounmap(fpga);
 145                 return PTR_ERR(dtm_thread);
 146         }
 147
 148         return 0;
 149 }
 150 device_initcall(pika_dtm_start);
 151 #endif