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 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE); 48 49 #ifdef CONFIG_EARLY_PRINTK 50 fw_init_early_console(-1); 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 void __init device_tree_init(void) 82 { 83 if (!initial_boot_params) 84 return; 85 86 unflatten_and_copy_device_tree(); 87 } 88 89 static struct pic32_sdhci_platform_data sdhci_data = { 90 .setup_dma = pic32_set_sdhci_adma_fifo_threshold, 91 }; 92 93 static struct of_dev_auxdata pic32_auxdata_lookup[] __initdata = { 94 OF_DEV_AUXDATA("microchip,pic32mzda-sdhci", 0, "sdhci", &sdhci_data), 95 { /* sentinel */} 96 }; 97 98 static int __init pic32_of_prepare_platform_data(struct of_dev_auxdata *lookup) 99 { 100 struct device_node *root, *np; 101 struct resource res; 102 103 root = of_find_node_by_path("/"); 104 105 for (; lookup->compatible; lookup++) { 106 np = of_find_compatible_node(NULL, NULL, lookup->compatible); 107 if (np) { 108 lookup->name = (char *)np->name; 109 if (lookup->phys_addr) 110 continue; 111 if (!of_address_to_resource(np, 0, &res)) 112 lookup->phys_addr = res.start; 113 } 114 } 115 116 return 0; 117 } 118 119 static int __init plat_of_setup(void) 120 { 121 if (!of_have_populated_dt()) 122 panic("Device tree not present"); 123 124 pic32_of_prepare_platform_data(pic32_auxdata_lookup); 125 if (of_platform_default_populate(NULL, pic32_auxdata_lookup, NULL)) 126 panic("Failed to populate DT"); 127 128 return 0; 129 } 130 arch_initcall(plat_of_setup); 131