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