![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
210 lines
4.2 KiB
C
210 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clocksource.h>
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#include <linux/init.h>
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#include <linux/irqchip.h>
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#include <linux/of_fdt.h>
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#include <asm/bootinfo.h>
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#include <asm/fw/fw.h>
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#include <asm/irq_cpu.h>
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#include <asm/machine.h>
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#include <asm/mips-cps.h>
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#include <asm/prom.h>
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#include <asm/smp-ops.h>
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#include <asm/time.h>
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static __initdata const void *fdt;
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static __initdata const struct mips_machine *mach;
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static __initdata const void *mach_match_data;
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void __init prom_init(void)
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{
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plat_get_fdt();
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BUG_ON(!fdt);
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}
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void __init *plat_get_fdt(void)
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{
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const struct mips_machine *check_mach;
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const struct of_device_id *match;
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if (fdt)
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/* Already set up */
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return (void *)fdt;
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if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_passed_dtb)) {
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/*
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* We booted using the UHI boot protocol, so we have been
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* provided with the appropriate device tree for the board.
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* Make use of it & search for any machine struct based upon
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* the root compatible string.
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*/
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fdt = (void *)fw_passed_dtb;
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for_each_mips_machine(check_mach) {
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match = mips_machine_is_compatible(check_mach, fdt);
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if (match) {
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mach = check_mach;
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mach_match_data = match->data;
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break;
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}
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}
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} else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
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/*
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* We weren't booted using the UHI boot protocol, but do
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* support some number of boards with legacy boot protocols.
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* Attempt to find the right one.
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*/
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for_each_mips_machine(check_mach) {
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if (!check_mach->detect)
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continue;
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if (!check_mach->detect())
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continue;
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mach = check_mach;
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}
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/*
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* If we don't recognise the machine then we can't continue, so
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* die here.
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*/
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BUG_ON(!mach);
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/* Retrieve the machine's FDT */
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fdt = mach->fdt;
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}
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return (void *)fdt;
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}
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#ifdef CONFIG_RELOCATABLE
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void __init plat_fdt_relocated(void *new_location)
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{
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/*
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* reset fdt as the cached value would point to the location
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* before relocations happened and update the location argument
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* if it was passed using UHI
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*/
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fdt = NULL;
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if (fw_arg0 == -2)
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fw_arg1 = (unsigned long)new_location;
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}
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#endif /* CONFIG_RELOCATABLE */
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void __init plat_mem_setup(void)
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{
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if (mach && mach->fixup_fdt)
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fdt = mach->fixup_fdt(fdt, mach_match_data);
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strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
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__dt_setup_arch((void *)fdt);
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}
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void __init device_tree_init(void)
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{
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int err;
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unflatten_and_copy_device_tree();
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mips_cpc_probe();
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err = register_cps_smp_ops();
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if (err)
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err = register_up_smp_ops();
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}
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int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
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const void *fdt_in,
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const struct mips_fdt_fixup *fixups)
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{
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int err;
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err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
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if (err) {
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pr_err("Failed to open FDT\n");
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return err;
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}
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for (; fixups->apply; fixups++) {
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err = fixups->apply(fdt_out);
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if (err) {
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pr_err("Failed to apply FDT fixup \"%s\"\n",
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fixups->description);
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return err;
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}
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}
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err = fdt_pack(fdt_out);
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if (err)
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pr_err("Failed to pack FDT\n");
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return err;
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}
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void __init plat_time_init(void)
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{
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struct device_node *np;
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struct clk *clk;
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of_clk_init(NULL);
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if (!cpu_has_counter) {
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mips_hpt_frequency = 0;
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} else if (mach && mach->measure_hpt_freq) {
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mips_hpt_frequency = mach->measure_hpt_freq();
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} else {
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np = of_get_cpu_node(0, NULL);
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if (!np) {
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pr_err("Failed to get CPU node\n");
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return;
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}
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clk = of_clk_get(np, 0);
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if (IS_ERR(clk)) {
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pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
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return;
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}
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mips_hpt_frequency = clk_get_rate(clk);
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clk_put(clk);
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switch (boot_cpu_type()) {
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case CPU_20KC:
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case CPU_25KF:
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/* The counter runs at the CPU clock rate */
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break;
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default:
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/* The counter runs at half the CPU clock rate */
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mips_hpt_frequency /= 2;
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break;
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}
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}
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timer_probe();
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}
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void __init arch_init_irq(void)
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{
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struct device_node *intc_node;
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intc_node = of_find_compatible_node(NULL, NULL,
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"mti,cpu-interrupt-controller");
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if (!cpu_has_veic && !intc_node)
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mips_cpu_irq_init();
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of_node_put(intc_node);
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irqchip_init();
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}
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void __init prom_free_prom_memory(void)
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{
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}
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