cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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auxio_32.c (3654B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* auxio.c: Probing for the Sparc AUXIO register at boot time.
      3 *
      4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
      5 */
      6
      7#include <linux/stddef.h>
      8#include <linux/init.h>
      9#include <linux/spinlock.h>
     10#include <linux/of.h>
     11#include <linux/of_device.h>
     12#include <linux/export.h>
     13
     14#include <asm/oplib.h>
     15#include <asm/io.h>
     16#include <asm/auxio.h>
     17#include <asm/string.h>		/* memset(), Linux has no bzero() */
     18#include <asm/cpu_type.h>
     19
     20#include "kernel.h"
     21
     22/* Probe and map in the Auxiliary I/O register */
     23
     24/* auxio_register is not static because it is referenced 
     25 * in entry.S::floppy_tdone
     26 */
     27void __iomem *auxio_register = NULL;
     28static DEFINE_SPINLOCK(auxio_lock);
     29
     30void __init auxio_probe(void)
     31{
     32	phandle node, auxio_nd;
     33	struct linux_prom_registers auxregs[1];
     34	struct resource r;
     35
     36	switch (sparc_cpu_model) {
     37	case sparc_leon:
     38	case sun4d:
     39		return;
     40	default:
     41		break;
     42	}
     43	node = prom_getchild(prom_root_node);
     44	auxio_nd = prom_searchsiblings(node, "auxiliary-io");
     45	if(!auxio_nd) {
     46		node = prom_searchsiblings(node, "obio");
     47		node = prom_getchild(node);
     48		auxio_nd = prom_searchsiblings(node, "auxio");
     49		if(!auxio_nd) {
     50#ifdef CONFIG_PCI
     51			/* There may be auxio on Ebus */
     52			return;
     53#else
     54			if(prom_searchsiblings(node, "leds")) {
     55				/* VME chassis sun4m machine, no auxio exists. */
     56				return;
     57			}
     58			prom_printf("Cannot find auxio node, cannot continue...\n");
     59			prom_halt();
     60#endif
     61		}
     62	}
     63	if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
     64		return;
     65	prom_apply_obio_ranges(auxregs, 0x1);
     66	/* Map the register both read and write */
     67	r.flags = auxregs[0].which_io & 0xF;
     68	r.start = auxregs[0].phys_addr;
     69	r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
     70	auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
     71	/* Fix the address on sun4m. */
     72	if ((((unsigned long) auxregs[0].phys_addr) & 3) == 3)
     73		auxio_register += (3 - ((unsigned long)auxio_register & 3));
     74
     75	set_auxio(AUXIO_LED, 0);
     76}
     77
     78unsigned char get_auxio(void)
     79{
     80	if(auxio_register) 
     81		return sbus_readb(auxio_register);
     82	return 0;
     83}
     84EXPORT_SYMBOL(get_auxio);
     85
     86void set_auxio(unsigned char bits_on, unsigned char bits_off)
     87{
     88	unsigned char regval;
     89	unsigned long flags;
     90	spin_lock_irqsave(&auxio_lock, flags);
     91	switch (sparc_cpu_model) {
     92	case sun4m:
     93		if(!auxio_register)
     94			break;     /* VME chassis sun4m, no auxio. */
     95		regval = sbus_readb(auxio_register);
     96		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
     97			auxio_register);
     98		break;
     99	case sun4d:
    100		break;
    101	default:
    102		panic("Can't set AUXIO register on this machine.");
    103	}
    104	spin_unlock_irqrestore(&auxio_lock, flags);
    105}
    106EXPORT_SYMBOL(set_auxio);
    107
    108/* sun4m power control register (AUXIO2) */
    109
    110volatile u8 __iomem *auxio_power_register = NULL;
    111
    112void __init auxio_power_probe(void)
    113{
    114	struct linux_prom_registers regs;
    115	phandle node;
    116	struct resource r;
    117
    118	/* Attempt to find the sun4m power control node. */
    119	node = prom_getchild(prom_root_node);
    120	node = prom_searchsiblings(node, "obio");
    121	node = prom_getchild(node);
    122	node = prom_searchsiblings(node, "power");
    123	if (node == 0 || (s32)node == -1)
    124		return;
    125
    126	/* Map the power control register. */
    127	if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
    128		return;
    129	prom_apply_obio_ranges(&regs, 1);
    130	memset(&r, 0, sizeof(r));
    131	r.flags = regs.which_io & 0xF;
    132	r.start = regs.phys_addr;
    133	r.end = regs.phys_addr + regs.reg_size - 1;
    134	auxio_power_register =
    135		(u8 __iomem *)of_ioremap(&r, 0, regs.reg_size, "auxpower");
    136
    137	/* Display a quick message on the console. */
    138	if (auxio_power_register)
    139		printk(KERN_INFO "Power off control detected.\n");
    140}