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 void __devinit auxio_report_dev(struct device_node *dp)
 115 {
 116         printk(KERN_INFO "AUXIO: Found device at %s\n",
 117                dp->full_name);
 118 }
 119
 120 static struct of_device_id auxio_match[] = {
 121         {
 122                 .name = "auxio",
 123         },
 124         {},
 125 };
 126
 127 MODULE_DEVICE_TABLE(of, auxio_match);
 128
 129 #ifdef CONFIG_SBUS
 130 static int __devinit auxio_sbus_probe(struct of_device *dev, const struct of_device_id *match)
 131 {
 132         struct sbus_dev *sdev = to_sbus_device(&dev->dev);
 133
 134         auxio_devtype  = AUXIO_TYPE_SBUS;
 135         auxio_register = sbus_ioremap(&sdev->resource[0], 0,
 136                                       sdev->reg_addrs[0].reg_size,
 137                                       "auxiliaryIO");
 138         if (!auxio_register)
 139                 return -ENODEV;
 140
 141         auxio_report_dev(dev->node);
 142         return 0;
 143 }
 144
 145 static struct of_platform_driver auxio_sbus_driver = {
 146         .name           = "auxio",
 147         .match_table    = auxio_match,
 148         .probe          = auxio_sbus_probe,
 149 };
 150 #endif
 151
 152 #ifdef CONFIG_PCI
 153 static int __devinit auxio_ebus_probe(struct of_device *dev, const struct of_device_id *match)
 154 {
 155         struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
 156
 157         auxio_devtype  = AUXIO_TYPE_EBUS;
 158         auxio_register = ioremap(edev->resource[0].start, sizeof(u32));
 159         if (!auxio_register)
 160                 return -ENODEV;
 161
 162         auxio_report_dev(dev->node);
 163
 164         auxio_set_led(AUXIO_LED_ON);
 165
 166         return 0;
 167 }
 168
 169 static struct of_platform_driver auxio_ebus_driver = {
 170         .name           = "auxio",
 171         .match_table    = auxio_match,
 172         .probe          = auxio_ebus_probe,
 173 };
 174 #endif
 175
 176 static int __init auxio_probe(void)
 177 {
 178 #ifdef CONFIG_SBUS
 179         of_register_driver(&auxio_sbus_driver, &sbus_bus_type);
 180 #endif
 181 #ifdef CONFIG_PCI
 182         of_register_driver(&auxio_ebus_driver, &ebus_bus_type);
 183 #endif
 184
 185         return 0;
 186 }
 187
 188 /* Must be after subsys_initcall() so that busses are probed.  Must
 189  * be before device_initcall() because things like the floppy driver
 190  * need to use the AUXIO register.
 191  */
 192 fs_initcall(auxio_probe);