1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Joshua Henderson, joshua.henderson@microchip.com
4 * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
5 */
6#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/of_address.h>
9#include <linux/of_fdt.h>
10#include <linux/of_platform.h>
11#include <linux/platform_data/sdhci-pic32.h>
12
13#include <asm/fw/fw.h>
14#include <asm/mips-boards/generic.h>
15#include <asm/prom.h>
16
17#include "pic32mzda.h"
18
19const char *get_system_type(void)
20{
21	return "PIC32MZDA";
22}
23
24void __init plat_mem_setup(void)
25{
26	void *dtb;
27
28	dtb = get_fdt();
29	if (!dtb) {
30		pr_err("pic32: no DTB found.\n");
31		return;
32	}
33
34	/*
35	 * Load the builtin device tree. This causes the chosen node to be
36	 * parsed resulting in our memory appearing.
37	 */
38	__dt_setup_arch(dtb);
39
40	pr_info("Found following command lines\n");
41	pr_info(" boot_command_line: %s\n", boot_command_line);
42	pr_info(" arcs_cmdline     : %s\n", arcs_cmdline);
43#ifdef CONFIG_CMDLINE_BOOL
44	pr_info(" builtin_cmdline  : %s\n", CONFIG_CMDLINE);
45#endif
46	if (dtb != __dtb_start)
47		strscpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
48
49#ifdef CONFIG_EARLY_PRINTK
50	fw_init_early_console();
51#endif
52	pic32_config_init();
53}
54
55static __init void pic32_init_cmdline(int argc, char *argv[])
56{
57	unsigned int count = COMMAND_LINE_SIZE - 1;
58	int i;
59	char *dst = &(arcs_cmdline[0]);
60	char *src;
61
62	for (i = 1; i < argc && count; ++i) {
63		src = argv[i];
64		while (*src && count) {
65			*dst++ = *src++;
66			--count;
67		}
68		*dst++ = ' ';
69	}
70	if (i > 1)
71		--dst;
72
73	*dst = 0;
74}
75
76void __init prom_init(void)
77{
78	pic32_init_cmdline((int)fw_arg0, (char **)fw_arg1);
79}
80
81static struct pic32_sdhci_platform_data sdhci_data = {
82	.setup_dma = pic32_set_sdhci_adma_fifo_threshold,
83};
84
85static struct of_dev_auxdata pic32_auxdata_lookup[] __initdata = {
86	OF_DEV_AUXDATA("microchip,pic32mzda-sdhci", 0, "sdhci", &sdhci_data),
87	{ /* sentinel */}
88};
89
90static int __init pic32_of_prepare_platform_data(struct of_dev_auxdata *lookup)
91{
92	struct device_node *root, *np;
93	struct resource res;
94
95	root = of_find_node_by_path("/");
96
97	for (; lookup->compatible; lookup++) {
98		np = of_find_compatible_node(NULL, NULL, lookup->compatible);
99		if (np) {
100			lookup->name = (char *)np->name;
101			if (lookup->phys_addr) {
102				of_node_put(np);
103				continue;
104			}
105			if (!of_address_to_resource(np, 0, &res))
106				lookup->phys_addr = res.start;
107			of_node_put(np);
108		}
109	}
110
111	of_node_put(root);
112
113	return 0;
114}
115
116static int __init plat_of_setup(void)
117{
118	if (!of_have_populated_dt())
119		panic("Device tree not present");
120
121	pic32_of_prepare_platform_data(pic32_auxdata_lookup);
122	if (of_platform_default_populate(NULL, pic32_auxdata_lookup, NULL))
123		panic("Failed to populate DT");
124
125	return 0;
126}
127arch_initcall(plat_of_setup);
128