arch/sparc64/kernel/auxio.c

   1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  *
   5  * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/ioport.h>
  13
  14 #include <asm/prom.h>
  15 #include <asm/of_device.h>
  16 #include <asm/io.h>
  17 #include <asm/auxio.h>
  18
  19 void __iomem *auxio_register = NULL;
  20 EXPORT_SYMBOL(auxio_register);
  21
  22 enum auxio_type {
  23         AUXIO_TYPE_NODEV,
  24         AUXIO_TYPE_SBUS,
  25         AUXIO_TYPE_EBUS
  26 };
  27
  28 static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
  29 static DEFINE_SPINLOCK(auxio_lock);
  30
  31 static void __auxio_sbus_set(u8 bits_on, u8 bits_off)
  32 {
  33         if (auxio_register) {
  34                 unsigned char regval;
  35                 unsigned long flags;
  36                 unsigned char newval;
  37
  38                 spin_lock_irqsave(&auxio_lock, flags);
  39
  40                 regval =  sbus_readb(auxio_register);
  41                 newval =  regval | bits_on;
  42                 newval &= ~bits_off;
  43                 newval &= ~AUXIO_AUX1_MASK;
  44                 sbus_writeb(newval, auxio_register);
  45
  46                 spin_unlock_irqrestore(&auxio_lock, flags);
  47         }
  48 }
  49
  50 static void __auxio_ebus_set(u8 bits_on, u8 bits_off)
  51 {
  52         if (auxio_register) {
  53                 unsigned char regval;
  54                 unsigned long flags;
  55                 unsigned char newval;
  56
  57                 spin_lock_irqsave(&auxio_lock, flags);
  58
  59                 regval =  (u8)readl(auxio_register);
  60                 newval =  regval | bits_on;
  61                 newval &= ~bits_off;
  62                 writel((u32)newval, auxio_register);
  63
  64                 spin_unlock_irqrestore(&auxio_lock, flags);
  65         }
  66 }
  67
  68 static inline void __auxio_ebus_set_led(int on)
  69 {
  70         (on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) :
  71                 __auxio_ebus_set(0, AUXIO_PCIO_LED) ;
  72 }
  73
  74 static inline void __auxio_sbus_set_led(int on)
  75 {
  76         (on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) :
  77                 __auxio_sbus_set(0, AUXIO_AUX1_LED) ;
  78 }
  79
  80 void auxio_set_led(int on)
  81 {
  82         switch(auxio_devtype) {
  83         case AUXIO_TYPE_SBUS:
  84                 __auxio_sbus_set_led(on);
  85                 break;
  86         case AUXIO_TYPE_EBUS:
  87                 __auxio_ebus_set_led(on);
  88                 break;
  89         default:
  90                 break;
  91         }
  92 }
  93
  94 static inline void __auxio_sbus_set_lte(int on)
  95 {
  96         (on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) :
  97                 __auxio_sbus_set(0, AUXIO_AUX1_LTE) ;
  98 }
  99
 100 void auxio_set_lte(int on)
 101 {
 102         switch(auxio_devtype) {
 103         case AUXIO_TYPE_SBUS:
 104                 __auxio_sbus_set_lte(on);
 105                 break;
 106         case AUXIO_TYPE_EBUS:
 107                 /* FALL-THROUGH */
 108         default:
 109                 break;
 110         }
 111 }
 112
 113 static struct of_device_id auxio_match[] = {
 114         {
 115                 .name = "auxio",
 116         },
 117         {},
 118 };
 119
 120 MODULE_DEVICE_TABLE(of, auxio_match);
 121
 122 static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
 123 {
 124         struct device_node *dp = dev->node;
 125         unsigned long size;
 126
 127         if (!strcmp(dp->parent->name, "ebus")) {
 128                 auxio_devtype = AUXIO_TYPE_EBUS;
 129                 size = sizeof(u32);
 130         } else if (!strcmp(dp->parent->name, "sbus")) {
 131                 auxio_devtype = AUXIO_TYPE_SBUS;
 132                 size = 1;
 133         } else {
 134                 printk("auxio: Unknown parent bus type [%s]\n",
 135                        dp->parent->name);
 136                 return -ENODEV;
 137         }
 138         auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
 139         if (!auxio_register)
 140                 return -ENODEV;
 141
 142         printk(KERN_INFO "AUXIO: Found device at %s\n",
 143                dp->full_name);
 144
 145         if (auxio_devtype == AUXIO_TYPE_EBUS)
 146                 auxio_set_led(AUXIO_LED_ON);
 147
 148         return 0;
 149 }
 150
 151 static struct of_platform_driver auxio_driver = {
 152         .name           = "auxio",
 153         .match_table    = auxio_match,
 154         .probe          = auxio_probe,
 155 };
 156
 157 static int __init auxio_init(void)
 158 {
 159         return of_register_driver(&auxio_driver, &of_bus_type);
 160 }
 161
 162 /* Must be after subsys_initcall() so that busses are probed.  Must
 163  * be before device_initcall() because things like the floppy driver
 164  * need to use the AUXIO register.
 165  */
 166 fs_initcall(auxio_init);