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https://github.com/Fishwaldo/linux-bl808.git
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0e6e9b648d
UARTs usually have fixed clock so we're switching to use of
constant values instead of something derived from core clock
frequency.
Among other things this will allow us to get rid of
arc_{get|set}_core_freq() and switch to generic clock
framework later on.
Acked-by: Christian Ruppert <christian.ruppert@alitech.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
84 lines
2 KiB
C
84 lines
2 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/clk.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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arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x) */
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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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const void *clk;
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int len;
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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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clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
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if (clk)
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arc_set_core_freq(of_read_ulong(clk, len/4));
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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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