xref: /linux/arch/mips/pic32/pic32mzda/init.c (revision 1448f8acf4cc61197a228bdb7126e7eeb92760fe)
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 
19 const char *get_system_type(void)
20 {
21 	return "PIC32MZDA";
22 }
23 
24 static ulong get_fdtaddr(void)
25 {
26 	ulong ftaddr = 0;
27 
28 	if (fw_passed_dtb && !fw_arg2 && !fw_arg3)
29 		return (ulong)fw_passed_dtb;
30 
31 	if (&__dtb_start < &__dtb_end)
32 		ftaddr = (ulong)__dtb_start;
33 
34 	return ftaddr;
35 }
36 
37 void __init plat_mem_setup(void)
38 {
39 	void *dtb;
40 
41 	dtb = (void *)get_fdtaddr();
42 	if (!dtb) {
43 		pr_err("pic32: no DTB found.\n");
44 		return;
45 	}
46 
47 	/*
48 	 * Load the builtin device tree. This causes the chosen node to be
49 	 * parsed resulting in our memory appearing.
50 	 */
51 	__dt_setup_arch(dtb);
52 
53 	pr_info("Found following command lines\n");
54 	pr_info(" boot_command_line: %s\n", boot_command_line);
55 	pr_info(" arcs_cmdline     : %s\n", arcs_cmdline);
56 #ifdef CONFIG_CMDLINE_BOOL
57 	pr_info(" builtin_cmdline  : %s\n", CONFIG_CMDLINE);
58 #endif
59 	if (dtb != __dtb_start)
60 		strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
61 
62 #ifdef CONFIG_EARLY_PRINTK
63 	fw_init_early_console(-1);
64 #endif
65 	pic32_config_init();
66 }
67 
68 static __init void pic32_init_cmdline(int argc, char *argv[])
69 {
70 	unsigned int count = COMMAND_LINE_SIZE - 1;
71 	int i;
72 	char *dst = &(arcs_cmdline[0]);
73 	char *src;
74 
75 	for (i = 1; i < argc && count; ++i) {
76 		src = argv[i];
77 		while (*src && count) {
78 			*dst++ = *src++;
79 			--count;
80 		}
81 		*dst++ = ' ';
82 	}
83 	if (i > 1)
84 		--dst;
85 
86 	*dst = 0;
87 }
88 
89 void __init prom_init(void)
90 {
91 	pic32_init_cmdline((int)fw_arg0, (char **)fw_arg1);
92 }
93 
94 void __init device_tree_init(void)
95 {
96 	if (!initial_boot_params)
97 		return;
98 
99 	unflatten_and_copy_device_tree();
100 }
101 
102 static struct pic32_sdhci_platform_data sdhci_data = {
103 	.setup_dma = pic32_set_sdhci_adma_fifo_threshold,
104 };
105 
106 static struct of_dev_auxdata pic32_auxdata_lookup[] __initdata = {
107 	OF_DEV_AUXDATA("microchip,pic32mzda-sdhci", 0, "sdhci", &sdhci_data),
108 	{ /* sentinel */}
109 };
110 
111 static int __init pic32_of_prepare_platform_data(struct of_dev_auxdata *lookup)
112 {
113 	struct device_node *root, *np;
114 	struct resource res;
115 
116 	root = of_find_node_by_path("/");
117 
118 	for (; lookup->compatible; lookup++) {
119 		np = of_find_compatible_node(NULL, NULL, lookup->compatible);
120 		if (np) {
121 			lookup->name = (char *)np->name;
122 			if (lookup->phys_addr)
123 				continue;
124 			if (!of_address_to_resource(np, 0, &res))
125 				lookup->phys_addr = res.start;
126 		}
127 	}
128 
129 	return 0;
130 }
131 
132 static int __init plat_of_setup(void)
133 {
134 	if (!of_have_populated_dt())
135 		panic("Device tree not present");
136 
137 	pic32_of_prepare_platform_data(pic32_auxdata_lookup);
138 	if (of_platform_default_populate(NULL, pic32_auxdata_lookup, NULL))
139 		panic("Failed to populate DT");
140 
141 	return 0;
142 }
143 arch_initcall(plat_of_setup);
144