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https://github.com/torvalds/linux
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263291fa44
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it was merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://lore.kernel.org/all/20230718143211.1066810-1-robh@kernel.org/ Signed-off-by: Rob Herring <robh@kernel.org>
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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