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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) * * Based on reduced version of METAG */
#include <linux/init.h>#include <linux/reboot.h>#include <linux/memblock.h>#include <linux/of.h>#include <linux/of_fdt.h>#include <asm/mach_desc.h>#include <asm/serial.h>
#ifdef CONFIG_SERIAL_EARLYCON
static unsigned int __initdata arc_base_baud;
unsigned int __init arc_early_base_baud(void){ return arc_base_baud/16;}
static void __init arc_set_early_base_baud(unsigned long dt_root){ if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x")) arc_base_baud = 166666666; /* Fixed 166.6MHz clk (TB10x) */ else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp") || of_flat_dt_is_compatible(dt_root, "snps,hsdk")) arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x & HSDK) */ else arc_base_baud = 50000000; /* Fixed default 50MHz */}#else#define arc_set_early_base_baud(dt_root)#endif
static const void * __init arch_get_next_mach(const char *const **match){ static const struct machine_desc *mdesc = __arch_info_begin; const struct machine_desc *m = mdesc;
if (m >= __arch_info_end) return NULL;
mdesc++; *match = m->dt_compat; return m;}
/** * setup_machine_fdt - Machine setup when an dtb was passed to the kernel * @dt: virtual address pointer to dt blob * * If a dtb was passed to the kernel, then use it to choose the correct * machine_desc and to setup the system. */const struct machine_desc * __init setup_machine_fdt(void *dt){ const struct machine_desc *mdesc; unsigned long dt_root;
if (!early_init_dt_scan(dt, __pa(dt))) return NULL;
mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); if (!mdesc) machine_halt();
dt_root = of_get_flat_dt_root(); arc_set_early_base_baud(dt_root);
return mdesc;}