153 lines
3.1 KiB
C
153 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* 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/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 <linux/of_device.h>
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#include <asm/prom.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_rmw(u8 bits_on, u8 bits_off, int ebus)
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{
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if (auxio_register) {
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unsigned long flags;
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u8 regval, newval;
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spin_lock_irqsave(&auxio_lock, flags);
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regval = (ebus ?
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(u8) readl(auxio_register) :
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sbus_readb(auxio_register));
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newval = regval | bits_on;
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newval &= ~bits_off;
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if (!ebus)
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newval &= ~AUXIO_AUX1_MASK;
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if (ebus)
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writel((u32) newval, auxio_register);
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else
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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_set_bit(u8 bit, int on, int ebus)
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{
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u8 bits_on = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
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u8 bits_off = 0;
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if (!on) {
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u8 tmp = bits_off;
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bits_off = bits_on;
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bits_on = tmp;
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}
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__auxio_rmw(bits_on, bits_off, ebus);
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}
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void auxio_set_led(int on)
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{
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int ebus = auxio_devtype == AUXIO_TYPE_EBUS;
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u8 bit;
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bit = (ebus ? AUXIO_PCIO_LED : AUXIO_AUX1_LED);
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__auxio_set_bit(bit, on, ebus);
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}
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EXPORT_SYMBOL(auxio_set_led);
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static void __auxio_sbus_set_lte(int on)
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{
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__auxio_set_bit(AUXIO_AUX1_LTE, on, 0);
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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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EXPORT_SYMBOL(auxio_set_lte);
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static const 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 auxio_probe(struct platform_device *dev)
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{
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struct device_node *dp = dev->dev.of_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 platform_driver auxio_driver = {
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.probe = auxio_probe,
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.driver = {
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.name = "auxio",
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.of_match_table = auxio_match,
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},
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};
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static int __init auxio_init(void)
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{
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return platform_driver_register(&auxio_driver);
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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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