1/*
  2 * Copyright (C) 2016 Imagination Technologies
  3 * Author: Paul Burton <paul.burton@imgtec.com>
  4 *
  5 * This program is free software; you can redistribute it and/or modify it
  6 * under the terms of the GNU General Public License as published by the
  7 * Free Software Foundation;  either version 2 of the  License, or (at your
  8 * option) any later version.
  9 */
 10
 11#include <linux/clk.h>
 12#include <linux/clk-provider.h>
 13#include <linux/clocksource.h>
 14#include <linux/init.h>
 15#include <linux/irqchip.h>
 16#include <linux/of_fdt.h>
 17#include <linux/of_platform.h>
 18
 19#include <asm/fw/fw.h>
 20#include <asm/irq_cpu.h>
 21#include <asm/machine.h>
 22#include <asm/mips-cpc.h>
 23#include <asm/prom.h>
 24#include <asm/smp-ops.h>
 25#include <asm/time.h>
 26
 27static __initdata const void *fdt;
 28static __initdata const struct mips_machine *mach;
 29static __initdata const void *mach_match_data;
 30
 31void __init prom_init(void)
 32{
 33	plat_get_fdt();
 34	BUG_ON(!fdt);
 35}
 36
 37void __init *plat_get_fdt(void)
 38{
 39	const struct mips_machine *check_mach;
 40	const struct of_device_id *match;
 41
 42	if (fdt)
 43		/* Already set up */
 44		return (void *)fdt;
 45
 46	if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
 47		/*
 48		 * We booted using the UHI boot protocol, so we have been
 49		 * provided with the appropriate device tree for the board.
 50		 * Make use of it & search for any machine struct based upon
 51		 * the root compatible string.
 52		 */
 53		fdt = (void *)fw_arg1;
 54
 55		for_each_mips_machine(check_mach) {
 56			match = mips_machine_is_compatible(check_mach, fdt);
 57			if (match) {
 58				mach = check_mach;
 59				mach_match_data = match->data;
 60				break;
 61			}
 62		}
 63	} else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
 64		/*
 65		 * We weren't booted using the UHI boot protocol, but do
 66		 * support some number of boards with legacy boot protocols.
 67		 * Attempt to find the right one.
 68		 */
 69		for_each_mips_machine(check_mach) {
 70			if (!check_mach->detect)
 71				continue;
 72
 73			if (!check_mach->detect())
 74				continue;
 75
 76			mach = check_mach;
 77		}
 78
 79		/*
 80		 * If we don't recognise the machine then we can't continue, so
 81		 * die here.
 82		 */
 83		BUG_ON(!mach);
 84
 85		/* Retrieve the machine's FDT */
 86		fdt = mach->fdt;
 87	}
 88	return (void *)fdt;
 89}
 90
 91void __init plat_mem_setup(void)
 92{
 93	if (mach && mach->fixup_fdt)
 94		fdt = mach->fixup_fdt(fdt, mach_match_data);
 95
 96	strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 97	__dt_setup_arch((void *)fdt);
 98}
 99
100void __init device_tree_init(void)
101{
102	int err;
103
104	unflatten_and_copy_device_tree();
105	mips_cpc_probe();
106
107	err = register_cps_smp_ops();
108	if (err)
109		err = register_up_smp_ops();
110}
111
112void __init plat_time_init(void)
113{
114	struct device_node *np;
115	struct clk *clk;
116
117	of_clk_init(NULL);
118
119	if (!cpu_has_counter) {
120		mips_hpt_frequency = 0;
121	} else if (mach && mach->measure_hpt_freq) {
122		mips_hpt_frequency = mach->measure_hpt_freq();
123	} else {
124		np = of_get_cpu_node(0, NULL);
125		if (!np) {
126			pr_err("Failed to get CPU node\n");
127			return;
128		}
129
130		clk = of_clk_get(np, 0);
131		if (IS_ERR(clk)) {
132			pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
133			return;
134		}
135
136		mips_hpt_frequency = clk_get_rate(clk);
137		clk_put(clk);
138
139		switch (boot_cpu_type()) {
140		case CPU_20KC:
141		case CPU_25KF:
142			/* The counter runs at the CPU clock rate */
143			break;
144		default:
145			/* The counter runs at half the CPU clock rate */
146			mips_hpt_frequency /= 2;
147			break;
148		}
149	}
150
151	clocksource_probe();
152}
153
154void __init arch_init_irq(void)
155{
156	struct device_node *intc_node;
157
158	intc_node = of_find_compatible_node(NULL, NULL,
159					    "mti,cpu-interrupt-controller");
160	if (!cpu_has_veic && !intc_node)
161		mips_cpu_irq_init();
162
163	irqchip_init();
164}
165
166static int __init publish_devices(void)
167{
168	if (!of_have_populated_dt())
169		panic("Device-tree not present");
170
171	if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
172		panic("Failed to populate DT");
173
174	return 0;
175}
176arch_initcall(publish_devices);
177
178void __init prom_free_prom_memory(void)
179{
180}