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
get_system_type(void)19 const char *get_system_type(void)
20 {
21 return "PIC32MZDA";
22 }
23
plat_mem_setup(void)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
pic32_init_cmdline(int argc,char * argv[])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
prom_init(void)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
pic32_of_prepare_platform_data(struct of_dev_auxdata * lookup)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
plat_of_setup(void)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);
128