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