140 lines
3.5 KiB
C
140 lines
3.5 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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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/of.h>
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#include <linux/export.h>
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#include <asm/oplib.h>
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#include <asm/io.h>
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#include <asm/auxio.h>
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#include <asm/string.h> /* memset(), Linux has no bzero() */
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#include <asm/cpu_type.h>
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#include "kernel.h"
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/* Probe and map in the Auxiliary I/O register */
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/* auxio_register is not static because it is referenced
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* in entry.S::floppy_tdone
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*/
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void __iomem *auxio_register = NULL;
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static DEFINE_SPINLOCK(auxio_lock);
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void __init auxio_probe(void)
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{
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phandle node, auxio_nd;
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struct linux_prom_registers auxregs[1];
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struct resource r;
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switch (sparc_cpu_model) {
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case sparc_leon:
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case sun4d:
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return;
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default:
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break;
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}
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node = prom_getchild(prom_root_node);
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auxio_nd = prom_searchsiblings(node, "auxiliary-io");
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if(!auxio_nd) {
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node = prom_searchsiblings(node, "obio");
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node = prom_getchild(node);
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auxio_nd = prom_searchsiblings(node, "auxio");
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if(!auxio_nd) {
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#ifdef CONFIG_PCI
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/* There may be auxio on Ebus */
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return;
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#else
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if(prom_searchsiblings(node, "leds")) {
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/* VME chassis sun4m machine, no auxio exists. */
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return;
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}
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prom_printf("Cannot find auxio node, cannot continue...\n");
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prom_halt();
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#endif
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}
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}
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if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
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return;
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prom_apply_obio_ranges(auxregs, 0x1);
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/* Map the register both read and write */
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r.flags = auxregs[0].which_io & 0xF;
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r.start = auxregs[0].phys_addr;
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r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
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auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
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/* Fix the address on sun4m. */
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if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3)
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auxio_register += (3 - ((unsigned long)auxio_register & 3));
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set_auxio(AUXIO_LED, 0);
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}
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unsigned char get_auxio(void)
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{
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if(auxio_register)
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return sbus_readb(auxio_register);
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return 0;
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}
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EXPORT_SYMBOL(get_auxio);
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void set_auxio(unsigned char bits_on, unsigned char bits_off)
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{
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unsigned char regval;
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unsigned long flags;
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spin_lock_irqsave(&auxio_lock, flags);
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switch (sparc_cpu_model) {
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case sun4m:
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if(!auxio_register)
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break; /* VME chassis sun4m, no auxio. */
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regval = sbus_readb(auxio_register);
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sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
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auxio_register);
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break;
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case sun4d:
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break;
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default:
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panic("Can't set AUXIO register on this machine.");
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}
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spin_unlock_irqrestore(&auxio_lock, flags);
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}
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EXPORT_SYMBOL(set_auxio);
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/* sun4m power control register (AUXIO2) */
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volatile u8 __iomem *auxio_power_register = NULL;
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void __init auxio_power_probe(void)
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{
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struct linux_prom_registers regs;
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phandle node;
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struct resource r;
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/* Attempt to find the sun4m power control node. */
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node = prom_getchild(prom_root_node);
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node = prom_searchsiblings(node, "obio");
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node = prom_getchild(node);
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node = prom_searchsiblings(node, "power");
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if (node == 0 || (s32)node == -1)
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return;
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/* Map the power control register. */
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if (prom_getproperty(node, "reg", (char *)®s, sizeof(regs)) <= 0)
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return;
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prom_apply_obio_ranges(®s, 1);
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memset(&r, 0, sizeof(r));
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r.flags = regs.which_io & 0xF;
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r.start = regs.phys_addr;
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r.end = regs.phys_addr + regs.reg_size - 1;
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auxio_power_register =
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(u8 __iomem *)of_ioremap(&r, 0, regs.reg_size, "auxpower");
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/* Display a quick message on the console. */
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if (auxio_power_register)
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printk(KERN_INFO "Power off control detected.\n");
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}
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