| /* |
| * 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/clk.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) |
| { |
| unsigned int core_clk = arc_get_core_freq(); |
| |
| if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x")) |
| arc_base_baud = core_clk/3; |
| else |
| arc_base_baud = core_clk; |
| } |
| #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; |
| const void *clk; |
| int len; |
| |
| 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(); |
| clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); |
| if (clk) |
| arc_set_core_freq(of_read_ulong(clk, len/4)); |
| |
| arc_set_early_base_baud(dt_root); |
| |
| return mdesc; |
| } |