xref: /kernel/linux/linux-5.10/arch/mips/lantiq/prom.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2010 John Crispin <john@phrozen.org>
5 */
6
7#include <linux/export.h>
8#include <linux/clk.h>
9#include <linux/memblock.h>
10#include <linux/of_fdt.h>
11
12#include <asm/bootinfo.h>
13#include <asm/time.h>
14#include <asm/prom.h>
15
16#include <lantiq.h>
17
18#include "prom.h"
19#include "clk.h"
20
21/* access to the ebu needs to be locked between different drivers */
22DEFINE_SPINLOCK(ebu_lock);
23EXPORT_SYMBOL_GPL(ebu_lock);
24
25/*
26 * this struct is filled by the soc specific detection code and holds
27 * information about the specific soc type, revision and name
28 */
29static struct ltq_soc_info soc_info;
30
31const char *get_system_type(void)
32{
33	return soc_info.sys_type;
34}
35
36int ltq_soc_type(void)
37{
38	return soc_info.type;
39}
40
41void __init prom_free_prom_memory(void)
42{
43}
44
45static void __init prom_init_cmdline(void)
46{
47	int argc = fw_arg0;
48	char **argv = (char **) KSEG1ADDR(fw_arg1);
49	int i;
50
51	arcs_cmdline[0] = '\0';
52
53	for (i = 0; i < argc; i++) {
54		char *p = (char *) KSEG1ADDR(argv[i]);
55
56		if (CPHYSADDR(p) && *p) {
57			strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
58			strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
59		}
60	}
61}
62
63void __init plat_mem_setup(void)
64{
65	void *dtb;
66
67	ioport_resource.start = IOPORT_RESOURCE_START;
68	ioport_resource.end = IOPORT_RESOURCE_END;
69	iomem_resource.start = IOMEM_RESOURCE_START;
70	iomem_resource.end = IOMEM_RESOURCE_END;
71
72	set_io_port_base((unsigned long) KSEG1);
73
74	if (fw_passed_dtb) /* UHI interface */
75		dtb = (void *)fw_passed_dtb;
76	else if (&__dtb_start != &__dtb_end)
77		dtb = (void *)__dtb_start;
78	else
79		panic("no dtb found");
80
81	/*
82	 * Load the devicetree. This causes the chosen node to be
83	 * parsed resulting in our memory appearing
84	 */
85	__dt_setup_arch(dtb);
86}
87
88void __init device_tree_init(void)
89{
90	unflatten_and_copy_device_tree();
91}
92
93void __init prom_init(void)
94{
95	/* call the soc specific detetcion code and get it to fill soc_info */
96	ltq_soc_detect(&soc_info);
97	snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
98		soc_info.name, soc_info.rev_type);
99	soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
100	pr_info("SoC: %s\n", soc_info.sys_type);
101	prom_init_cmdline();
102
103#if defined(CONFIG_MIPS_MT_SMP)
104	if (register_vsmp_smp_ops())
105		panic("failed to register_vsmp_smp_ops()");
106#endif
107}
108