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(path: "/" ); |
96 | |
97 | for (; lookup->compatible; lookup++) { |
98 | np = of_find_compatible_node(NULL, NULL, compat: lookup->compatible); |
99 | if (np) { |
100 | lookup->name = (char *)np->name; |
101 | if (lookup->phys_addr) { |
102 | of_node_put(node: np); |
103 | continue; |
104 | } |
105 | if (!of_address_to_resource(dev: np, index: 0, r: &res)) |
106 | lookup->phys_addr = res.start; |
107 | of_node_put(node: np); |
108 | } |
109 | } |
110 | |
111 | of_node_put(node: root); |
112 | |
113 | return 0; |
114 | } |
115 | |
116 | static int __init plat_of_setup(void) |
117 | { |
118 | if (!of_have_populated_dt()) |
119 | panic(fmt: "Device tree not present" ); |
120 | |
121 | pic32_of_prepare_platform_data(lookup: pic32_auxdata_lookup); |
122 | if (of_platform_default_populate(NULL, lookup: pic32_auxdata_lookup, NULL)) |
123 | panic(fmt: "Failed to populate DT" ); |
124 | |
125 | return 0; |
126 | } |
127 | arch_initcall(plat_of_setup); |
128 | |