GNU Linux-libre 6.7.9-gnu
[releases.git] / arch / mips / pic32 / pic32mzda / init.c
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 void __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
55 static __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
76 void __init prom_init(void)
77 {
78         pic32_init_cmdline((int)fw_arg0, (char **)fw_arg1);
79 }
80
81 static struct pic32_sdhci_platform_data sdhci_data = {
82         .setup_dma = pic32_set_sdhci_adma_fifo_threshold,
83 };
84
85 static struct of_dev_auxdata pic32_auxdata_lookup[] __initdata = {
86         OF_DEV_AUXDATA("microchip,pic32mzda-sdhci", 0, "sdhci", &sdhci_data),
87         { /* sentinel */}
88 };
89
90 static 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
116 static 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 }
127 arch_initcall(plat_of_setup);