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