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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/arc/kernel/devtree.c | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arc/kernel/devtree.c')
-rw-r--r-- | arch/arc/kernel/devtree.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c new file mode 100644 index 000000000..521ef3521 --- /dev/null +++ b/arch/arc/kernel/devtree.c @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) + * + * Based on reduced version of METAG + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + + +#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> + +#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 if (of_flat_dt_is_compatible(dt_root, "ezchip,arc-nps")) + arc_base_baud = 800000000; /* Fixed 800MHz clk (NPS) */ + 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; +} |