| 1 | /* MN10300 Arch-specific initialisation |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/mm.h> |
| 15 | #include <linux/stddef.h> |
| 16 | #include <linux/unistd.h> |
| 17 | #include <linux/ptrace.h> |
| 18 | #include <linux/user.h> |
| 19 | #include <linux/tty.h> |
| 20 | #include <linux/ioport.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/bootmem.h> |
| 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/cpu.h> |
| 26 | #include <asm/processor.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/setup.h> |
| 30 | #include <asm/io.h> |
| 31 | #include <asm/smp.h> |
| 32 | #include <proc/proc.h> |
| 33 | #include <asm/fpu.h> |
| 34 | #include <asm/sections.h> |
| 35 | |
| 36 | struct mn10300_cpuinfo boot_cpu_data; |
| 37 | |
| 38 | static char __initdata cmd_line[COMMAND_LINE_SIZE]; |
| 39 | char redboot_command_line[COMMAND_LINE_SIZE] = |
| 40 | "console=ttyS0,115200 root=/dev/mtdblock3 rw"; |
| 41 | |
| 42 | char __initdata redboot_platform_name[COMMAND_LINE_SIZE]; |
| 43 | |
| 44 | static struct resource code_resource = { |
| 45 | .start = 0x100000, |
| 46 | .end = 0, |
| 47 | .name = "Kernel code", |
| 48 | }; |
| 49 | |
| 50 | static struct resource data_resource = { |
| 51 | .start = 0, |
| 52 | .end = 0, |
| 53 | .name = "Kernel data", |
| 54 | }; |
| 55 | |
| 56 | static unsigned long __initdata phys_memory_base; |
| 57 | static unsigned long __initdata phys_memory_end; |
| 58 | static unsigned long __initdata memory_end; |
| 59 | unsigned long memory_size; |
| 60 | |
| 61 | struct thread_info *__current_ti = &init_thread_union.thread_info; |
| 62 | struct task_struct *__current = &init_task; |
| 63 | |
| 64 | #define mn10300_known_cpus 5 |
| 65 | static const char *const mn10300_cputypes[] = { |
| 66 | "am33-1", |
| 67 | "am33-2", |
| 68 | "am34-1", |
| 69 | "am33-3", |
| 70 | "am34-2", |
| 71 | "unknown" |
| 72 | }; |
| 73 | |
| 74 | /* |
| 75 | * Pick out the memory size. We look for mem=size, |
| 76 | * where size is "size[KkMm]" |
| 77 | */ |
| 78 | static int __init early_mem(char *p) |
| 79 | { |
| 80 | memory_size = memparse(p, &p); |
| 81 | |
| 82 | if (memory_size == 0) |
| 83 | panic("Memory size not known\n"); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | early_param("mem", early_mem); |
| 88 | |
| 89 | /* |
| 90 | * architecture specific setup |
| 91 | */ |
| 92 | void __init setup_arch(char **cmdline_p) |
| 93 | { |
| 94 | unsigned long bootmap_size; |
| 95 | unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn; |
| 96 | |
| 97 | cpu_init(); |
| 98 | unit_setup(); |
| 99 | smp_init_cpus(); |
| 100 | |
| 101 | /* save unparsed command line copy for /proc/cmdline */ |
| 102 | strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE); |
| 103 | |
| 104 | /* populate cmd_line too for later use, preserving boot_command_line */ |
| 105 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); |
| 106 | *cmdline_p = cmd_line; |
| 107 | |
| 108 | parse_early_param(); |
| 109 | |
| 110 | memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS + |
| 111 | memory_size; |
| 112 | if (memory_end > phys_memory_end) |
| 113 | memory_end = phys_memory_end; |
| 114 | |
| 115 | init_mm.start_code = (unsigned long)&_text; |
| 116 | init_mm.end_code = (unsigned long) &_etext; |
| 117 | init_mm.end_data = (unsigned long) &_edata; |
| 118 | init_mm.brk = (unsigned long) &_end; |
| 119 | |
| 120 | code_resource.start = virt_to_bus(&_text); |
| 121 | code_resource.end = virt_to_bus(&_etext)-1; |
| 122 | data_resource.start = virt_to_bus(&_etext); |
| 123 | data_resource.end = virt_to_bus(&_edata)-1; |
| 124 | |
| 125 | start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT); |
| 126 | kstart_pfn = PFN_UP(__pa(&_text)); |
| 127 | free_pfn = PFN_UP(__pa(&_end)); |
| 128 | end_pfn = PFN_DOWN(__pa(memory_end)); |
| 129 | |
| 130 | bootmap_size = init_bootmem_node(&contig_page_data, |
| 131 | free_pfn, |
| 132 | start_pfn, |
| 133 | end_pfn); |
| 134 | |
| 135 | if (kstart_pfn > start_pfn) |
| 136 | free_bootmem(PFN_PHYS(start_pfn), |
| 137 | PFN_PHYS(kstart_pfn - start_pfn)); |
| 138 | |
| 139 | free_bootmem(PFN_PHYS(free_pfn), |
| 140 | PFN_PHYS(end_pfn - free_pfn)); |
| 141 | |
| 142 | /* If interrupt vector table is in main ram, then we need to |
| 143 | reserve the page it is occupying. */ |
| 144 | if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS && |
| 145 | CONFIG_INTERRUPT_VECTOR_BASE < memory_end) |
| 146 | reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE, |
| 147 | BOOTMEM_DEFAULT); |
| 148 | |
| 149 | reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size, |
| 150 | BOOTMEM_DEFAULT); |
| 151 | |
| 152 | #ifdef CONFIG_VT |
| 153 | #if defined(CONFIG_VGA_CONSOLE) |
| 154 | conswitchp = &vga_con; |
| 155 | #elif defined(CONFIG_DUMMY_CONSOLE) |
| 156 | conswitchp = &dummy_con; |
| 157 | #endif |
| 158 | #endif |
| 159 | |
| 160 | paging_init(); |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * perform CPU initialisation |
| 165 | */ |
| 166 | void __init cpu_init(void) |
| 167 | { |
| 168 | unsigned long cpurev = CPUREV, type; |
| 169 | |
| 170 | type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S; |
| 171 | if (type > mn10300_known_cpus) |
| 172 | type = mn10300_known_cpus; |
| 173 | |
| 174 | printk(KERN_INFO "Panasonic %s, rev %ld\n", |
| 175 | mn10300_cputypes[type], |
| 176 | (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S); |
| 177 | |
| 178 | get_mem_info(&phys_memory_base, &memory_size); |
| 179 | phys_memory_end = phys_memory_base + memory_size; |
| 180 | |
| 181 | fpu_init_state(); |
| 182 | } |
| 183 | |
| 184 | static struct cpu cpu_devices[NR_CPUS]; |
| 185 | |
| 186 | static int __init topology_init(void) |
| 187 | { |
| 188 | int i; |
| 189 | |
| 190 | for_each_present_cpu(i) |
| 191 | register_cpu(&cpu_devices[i], i); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | subsys_initcall(topology_init); |
| 197 | |
| 198 | /* |
| 199 | * Get CPU information for use by the procfs. |
| 200 | */ |
| 201 | static int show_cpuinfo(struct seq_file *m, void *v) |
| 202 | { |
| 203 | #ifdef CONFIG_SMP |
| 204 | struct mn10300_cpuinfo *c = v; |
| 205 | unsigned long cpu_id = c - cpu_data; |
| 206 | unsigned long cpurev = c->type, type, icachesz, dcachesz; |
| 207 | #else /* CONFIG_SMP */ |
| 208 | unsigned long cpu_id = 0; |
| 209 | unsigned long cpurev = CPUREV, type, icachesz, dcachesz; |
| 210 | #endif /* CONFIG_SMP */ |
| 211 | |
| 212 | #ifdef CONFIG_SMP |
| 213 | if (!cpu_online(cpu_id)) |
| 214 | return 0; |
| 215 | #endif |
| 216 | |
| 217 | type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S; |
| 218 | if (type > mn10300_known_cpus) |
| 219 | type = mn10300_known_cpus; |
| 220 | |
| 221 | icachesz = |
| 222 | ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) * |
| 223 | ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) * |
| 224 | 1024; |
| 225 | |
| 226 | dcachesz = |
| 227 | ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) * |
| 228 | ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) * |
| 229 | 1024; |
| 230 | |
| 231 | seq_printf(m, |
| 232 | "processor : %ld\n" |
| 233 | "vendor_id : " PROCESSOR_VENDOR_NAME "\n" |
| 234 | "cpu core : %s\n" |
| 235 | "cpu rev : %lu\n" |
| 236 | "model name : " PROCESSOR_MODEL_NAME "\n" |
| 237 | "icache size: %lu\n" |
| 238 | "dcache size: %lu\n", |
| 239 | cpu_id, |
| 240 | mn10300_cputypes[type], |
| 241 | (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S, |
| 242 | icachesz, |
| 243 | dcachesz |
| 244 | ); |
| 245 | |
| 246 | seq_printf(m, |
| 247 | "ioclk speed: %lu.%02luMHz\n" |
| 248 | "bogomips : %lu.%02lu\n\n", |
| 249 | MN10300_IOCLK / 1000000, |
| 250 | (MN10300_IOCLK / 10000) % 100, |
| 251 | #ifdef CONFIG_SMP |
| 252 | c->loops_per_jiffy / (500000 / HZ), |
| 253 | (c->loops_per_jiffy / (5000 / HZ)) % 100 |
| 254 | #else /* CONFIG_SMP */ |
| 255 | loops_per_jiffy / (500000 / HZ), |
| 256 | (loops_per_jiffy / (5000 / HZ)) % 100 |
| 257 | #endif /* CONFIG_SMP */ |
| 258 | ); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static void *c_start(struct seq_file *m, loff_t *pos) |
| 264 | { |
| 265 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; |
| 266 | } |
| 267 | |
| 268 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) |
| 269 | { |
| 270 | ++*pos; |
| 271 | return c_start(m, pos); |
| 272 | } |
| 273 | |
| 274 | static void c_stop(struct seq_file *m, void *v) |
| 275 | { |
| 276 | } |
| 277 | |
| 278 | const struct seq_operations cpuinfo_op = { |
| 279 | .start = c_start, |
| 280 | .next = c_next, |
| 281 | .stop = c_stop, |
| 282 | .show = show_cpuinfo, |
| 283 | }; |