From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/arc/kernel/devtree.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 arch/arc/kernel/devtree.c (limited to 'arch/arc/kernel/devtree.c') diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c new file mode 100644 index 0000000000..4c9e61457b --- /dev/null +++ b/arch/arc/kernel/devtree.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) + * + * Based on reduced version of METAG + */ + + +#include +#include +#include +#include +#include +#include +#include + +#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)) + 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; +} -- cgit v1.2.3