167 lines
3.4 KiB
C
167 lines
3.4 KiB
C
/* auxio.c: Probing for the Sparc AUXIO register at boot time.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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*
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* Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <asm/prom.h>
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#include <asm/of_device.h>
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#include <asm/io.h>
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#include <asm/auxio.h>
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void __iomem *auxio_register = NULL;
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EXPORT_SYMBOL(auxio_register);
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enum auxio_type {
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AUXIO_TYPE_NODEV,
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AUXIO_TYPE_SBUS,
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AUXIO_TYPE_EBUS
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};
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static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
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static DEFINE_SPINLOCK(auxio_lock);
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static void __auxio_sbus_set(u8 bits_on, u8 bits_off)
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{
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if (auxio_register) {
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unsigned char regval;
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unsigned long flags;
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unsigned char newval;
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spin_lock_irqsave(&auxio_lock, flags);
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regval = sbus_readb(auxio_register);
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newval = regval | bits_on;
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newval &= ~bits_off;
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newval &= ~AUXIO_AUX1_MASK;
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sbus_writeb(newval, auxio_register);
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spin_unlock_irqrestore(&auxio_lock, flags);
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}
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}
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static void __auxio_ebus_set(u8 bits_on, u8 bits_off)
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{
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if (auxio_register) {
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unsigned char regval;
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unsigned long flags;
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unsigned char newval;
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spin_lock_irqsave(&auxio_lock, flags);
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regval = (u8)readl(auxio_register);
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newval = regval | bits_on;
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newval &= ~bits_off;
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writel((u32)newval, auxio_register);
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spin_unlock_irqrestore(&auxio_lock, flags);
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}
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}
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static inline void __auxio_ebus_set_led(int on)
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{
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(on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) :
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__auxio_ebus_set(0, AUXIO_PCIO_LED) ;
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}
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static inline void __auxio_sbus_set_led(int on)
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{
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(on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) :
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__auxio_sbus_set(0, AUXIO_AUX1_LED) ;
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}
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void auxio_set_led(int on)
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{
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switch(auxio_devtype) {
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case AUXIO_TYPE_SBUS:
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__auxio_sbus_set_led(on);
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break;
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case AUXIO_TYPE_EBUS:
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__auxio_ebus_set_led(on);
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break;
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default:
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break;
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}
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}
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static inline void __auxio_sbus_set_lte(int on)
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{
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(on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) :
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__auxio_sbus_set(0, AUXIO_AUX1_LTE) ;
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}
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void auxio_set_lte(int on)
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{
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switch(auxio_devtype) {
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case AUXIO_TYPE_SBUS:
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__auxio_sbus_set_lte(on);
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break;
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case AUXIO_TYPE_EBUS:
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/* FALL-THROUGH */
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default:
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break;
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}
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}
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static struct of_device_id auxio_match[] = {
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{
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.name = "auxio",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, auxio_match);
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static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
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{
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struct device_node *dp = dev->node;
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unsigned long size;
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if (!strcmp(dp->parent->name, "ebus")) {
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auxio_devtype = AUXIO_TYPE_EBUS;
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size = sizeof(u32);
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} else if (!strcmp(dp->parent->name, "sbus")) {
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auxio_devtype = AUXIO_TYPE_SBUS;
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size = 1;
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} else {
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printk("auxio: Unknown parent bus type [%s]\n",
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dp->parent->name);
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return -ENODEV;
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}
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auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
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if (!auxio_register)
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return -ENODEV;
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printk(KERN_INFO "AUXIO: Found device at %s\n",
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dp->full_name);
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if (auxio_devtype == AUXIO_TYPE_EBUS)
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auxio_set_led(AUXIO_LED_ON);
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return 0;
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}
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static struct of_platform_driver auxio_driver = {
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.name = "auxio",
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.match_table = auxio_match,
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.probe = auxio_probe,
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};
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static int __init auxio_init(void)
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{
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return of_register_driver(&auxio_driver, &of_bus_type);
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}
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/* Must be after subsys_initcall() so that busses are probed. Must
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* be before device_initcall() because things like the floppy driver
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* need to use the AUXIO register.
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*/
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fs_initcall(auxio_init);
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