cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

devtree.c (1803B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
      4 *
      5 * Based on reduced version of METAG
      6 */
      7
      8
      9#include <linux/init.h>
     10#include <linux/reboot.h>
     11#include <linux/memblock.h>
     12#include <linux/of.h>
     13#include <linux/of_fdt.h>
     14#include <asm/mach_desc.h>
     15
     16#ifdef CONFIG_SERIAL_EARLYCON
     17
     18static unsigned int __initdata arc_base_baud;
     19
     20unsigned int __init arc_early_base_baud(void)
     21{
     22	return arc_base_baud/16;
     23}
     24
     25static void __init arc_set_early_base_baud(unsigned long dt_root)
     26{
     27	if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
     28		arc_base_baud = 166666666;	/* Fixed 166.6MHz clk (TB10x) */
     29	else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp") ||
     30		 of_flat_dt_is_compatible(dt_root, "snps,hsdk"))
     31		arc_base_baud = 33333333;	/* Fixed 33MHz clk (AXS10x & HSDK) */
     32	else
     33		arc_base_baud = 50000000;	/* Fixed default 50MHz */
     34}
     35#else
     36#define arc_set_early_base_baud(dt_root)
     37#endif
     38
     39static const void * __init arch_get_next_mach(const char *const **match)
     40{
     41	static const struct machine_desc *mdesc = __arch_info_begin;
     42	const struct machine_desc *m = mdesc;
     43
     44	if (m >= __arch_info_end)
     45		return NULL;
     46
     47	mdesc++;
     48	*match = m->dt_compat;
     49	return m;
     50}
     51
     52/**
     53 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
     54 * @dt:		virtual address pointer to dt blob
     55 *
     56 * If a dtb was passed to the kernel, then use it to choose the correct
     57 * machine_desc and to setup the system.
     58 */
     59const struct machine_desc * __init setup_machine_fdt(void *dt)
     60{
     61	const struct machine_desc *mdesc;
     62	unsigned long dt_root;
     63
     64	if (!early_init_dt_scan(dt))
     65		return NULL;
     66
     67	mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
     68	if (!mdesc)
     69		machine_halt();
     70
     71	dt_root = of_get_flat_dt_root();
     72	arc_set_early_base_baud(dt_root);
     73
     74	return mdesc;
     75}