1 /* auxio.c: Probing for the Sparc AUXIO register at boot time.
3 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
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>
15 #include <asm/of_device.h>
17 #include <asm/auxio.h>
19 void __iomem *auxio_register = NULL;
20 EXPORT_SYMBOL(auxio_register);
28 static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
29 static DEFINE_SPINLOCK(auxio_lock);
31 static void __auxio_sbus_set(u8 bits_on, u8 bits_off)
38 spin_lock_irqsave(&auxio_lock, flags);
40 regval = sbus_readb(auxio_register);
41 newval = regval | bits_on;
43 newval &= ~AUXIO_AUX1_MASK;
44 sbus_writeb(newval, auxio_register);
46 spin_unlock_irqrestore(&auxio_lock, flags);
50 static void __auxio_ebus_set(u8 bits_on, u8 bits_off)
57 spin_lock_irqsave(&auxio_lock, flags);
59 regval = (u8)readl(auxio_register);
60 newval = regval | bits_on;
62 writel((u32)newval, auxio_register);
64 spin_unlock_irqrestore(&auxio_lock, flags);
68 static inline void __auxio_ebus_set_led(int on)
70 (on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) :
71 __auxio_ebus_set(0, AUXIO_PCIO_LED) ;
74 static inline void __auxio_sbus_set_led(int on)
76 (on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) :
77 __auxio_sbus_set(0, AUXIO_AUX1_LED) ;
80 void auxio_set_led(int on)
82 switch(auxio_devtype) {
84 __auxio_sbus_set_led(on);
87 __auxio_ebus_set_led(on);
94 static inline void __auxio_sbus_set_lte(int on)
96 (on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) :
97 __auxio_sbus_set(0, AUXIO_AUX1_LTE) ;
100 void auxio_set_lte(int on)
102 switch(auxio_devtype) {
103 case AUXIO_TYPE_SBUS:
104 __auxio_sbus_set_lte(on);
106 case AUXIO_TYPE_EBUS:
113 static struct of_device_id auxio_match[] = {
120 MODULE_DEVICE_TABLE(of, auxio_match);
122 static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
124 struct device_node *dp = dev->node;
127 if (!strcmp(dp->parent->name, "ebus")) {
128 auxio_devtype = AUXIO_TYPE_EBUS;
130 } else if (!strcmp(dp->parent->name, "sbus")) {
131 auxio_devtype = AUXIO_TYPE_SBUS;
134 printk("auxio: Unknown parent bus type [%s]\n",
138 auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
142 printk(KERN_INFO "AUXIO: Found device at %s\n",
145 if (auxio_devtype == AUXIO_TYPE_EBUS)
146 auxio_set_led(AUXIO_LED_ON);
151 static struct of_platform_driver auxio_driver = {
153 .match_table = auxio_match,
154 .probe = auxio_probe,
157 static int __init auxio_init(void)
159 return of_register_driver(&auxio_driver, &of_bus_type);
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.
166 fs_initcall(auxio_init);