1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright © 2013 Tony Breeds IBM Corporation 4 * Copyright © 2013 Alistair Popple IBM Corporation 5 * 6 * Based on earlier code: 7 * Copyright (C) Paul Mackerras 1997. 8 * 9 * Matt Porter <mporter@kernel.crashing.org> 10 * Copyright 2002-2005 MontaVista Software Inc. 11 * 12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 13 * Copyright (c) 2003, 2004 Zultys Technologies 14 * 15 * Copyright 2007 David Gibson, IBM Corporation. 16 * Copyright 2010 Ben. Herrenschmidt, IBM Corporation. 17 * Copyright © 2011 David Kleikamp IBM Corporation 18 */ 19 #include <stdarg.h> 20 #include <stddef.h> 21 #include "types.h" 22 #include "elf.h" 23 #include "string.h" 24 #include "stdlib.h" 25 #include "stdio.h" 26 #include "page.h" 27 #include "ops.h" 28 #include "reg.h" 29 #include "io.h" 30 #include "dcr.h" 31 #include "4xx.h" 32 #include "44x.h" 33 #include "libfdt.h" 34 35 BSS_STACK(4096); 36 37 #define SPRN_PIR 0x11E /* Processor Identification Register */ 38 #define USERDATA_LEN 256 /* Length of userdata passed in by PIBS */ 39 #define MAX_RANKS 0x4 40 #define DDR3_MR0CF 0x80010011U 41 #define CCTL0_MCO2 0x8000080FU 42 #define CCTL0_MCO3 0x80000810U 43 #define CCTL0_MCO4 0x80000811U 44 #define CCTL0_MCO5 0x80000812U 45 #define CCTL0_MCO6 0x80000813U 46 47 static unsigned long long ibm_akebono_memsize; 48 static long long unsigned mac_addr; 49 50 static unsigned long long ibm_akebono_detect_memsize(void) 51 { 52 u32 reg; 53 unsigned i; 54 unsigned long long memsize = 0; 55 56 for (i = 0; i < MAX_RANKS; i++) { 57 reg = mfdcrx(DDR3_MR0CF + i); 58 59 if (!(reg & 1)) 60 continue; 61 62 reg &= 0x0000f000; 63 reg >>= 12; 64 memsize += (0x800000ULL << reg); 65 } 66 67 return memsize; 68 } 69 70 static void ibm_akebono_fixups(void) 71 { 72 void *emac; 73 u32 reg; 74 75 dt_fixup_memory(0x0ULL, ibm_akebono_memsize); 76 77 /* Fixup the SD timeout frequency */ 78 mtdcrx(CCTL0_MCO4, 0x1); 79 80 /* Disable SD high-speed mode (which seems to be broken) */ 81 reg = mfdcrx(CCTL0_MCO2) & ~0x2; 82 mtdcrx(CCTL0_MCO2, reg); 83 84 /* Set the MAC address */ 85 emac = finddevice("/plb/opb/ethernet"); 86 if (emac > 0) { 87 if (mac_addr) 88 setprop(emac, "local-mac-address", 89 ((u8 *) &mac_addr) + 2 , 6); 90 } 91 } 92 93 void platform_init(char *userdata) 94 { 95 unsigned long end_of_ram, avail_ram; 96 u32 pir_reg; 97 int node, size; 98 const u32 *timebase; 99 int len, i, userdata_len; 100 char *end; 101 102 userdata[USERDATA_LEN - 1] = '\0'; 103 userdata_len = strlen(userdata); 104 for (i = 0; i < userdata_len - 15; i++) { 105 if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) { 106 if (i > 0 && userdata[i - 1] != ' ') { 107 /* We've only found a substring ending 108 * with local-mac-addr so this isn't 109 * our mac address. */ 110 continue; 111 } 112 113 mac_addr = strtoull(&userdata[i + 15], &end, 16); 114 115 /* Remove the "local-mac-addr=<...>" from the kernel 116 * command line, including the tailing space if 117 * present. */ 118 if (*end == ' ') 119 end++; 120 121 len = ((int) end) - ((int) &userdata[i]); 122 memmove(&userdata[i], end, 123 userdata_len - (len + i) + 1); 124 break; 125 } 126 } 127 128 loader_info.cmdline = userdata; 129 loader_info.cmdline_len = 256; 130 131 ibm_akebono_memsize = ibm_akebono_detect_memsize(); 132 if (ibm_akebono_memsize >> 32) 133 end_of_ram = ~0UL; 134 else 135 end_of_ram = ibm_akebono_memsize; 136 avail_ram = end_of_ram - (unsigned long)_end; 137 138 simple_alloc_init(_end, avail_ram, 128, 64); 139 platform_ops.fixups = ibm_akebono_fixups; 140 platform_ops.exit = ibm44x_dbcr_reset; 141 pir_reg = mfspr(SPRN_PIR); 142 143 /* Make sure FDT blob is sane */ 144 if (fdt_check_header(_dtb_start) != 0) 145 fatal("Invalid device tree blob\n"); 146 147 node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", 148 "cpu", sizeof("cpu")); 149 if (!node) 150 fatal("Cannot find cpu node\n"); 151 timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size); 152 if (timebase && (size == 4)) 153 timebase_period_ns = 1000000000 / *timebase; 154 155 fdt_set_boot_cpuid_phys(_dtb_start, pir_reg); 156 fdt_init(_dtb_start); 157 158 serial_console_init(); 159 } 160