arch/avr32/kernel/cpu.c

   1 /*
   2  * Copyright (C) 2005-2006 Atmel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/init.h>
   9 #include <linux/sysdev.h>
  10 #include <linux/seq_file.h>
  11 #include <linux/cpu.h>
  12 #include <linux/module.h>
  13 #include <linux/percpu.h>
  14 #include <linux/param.h>
  15 #include <linux/errno.h>
  16
  17 #include <asm/setup.h>
  18 #include <asm/sysreg.h>
  19
  20 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  21
  22 #ifdef CONFIG_PERFORMANCE_COUNTERS
  23
  24 /*
  25  * XXX: If/when a SMP-capable implementation of AVR32 will ever be
  26  * made, we must make sure that the code executes on the correct CPU.
  27  */
  28 static ssize_t show_pc0event(struct sys_device *dev, char *buf)
  29 {
  30         unsigned long pccr;
  31
  32         pccr = sysreg_read(PCCR);
  33         return sprintf(buf, "0x%lx\n", (pccr >> 12) & 0x3f);
  34 }
  35 static ssize_t store_pc0event(struct sys_device *dev, const char *buf,
  36                               size_t count)
  37 {
  38         unsigned long val;
  39         char *endp;
  40
  41         val = simple_strtoul(buf, &endp, 0);
  42         if (endp == buf || val > 0x3f)
  43                 return -EINVAL;
  44         val = (val << 12) | (sysreg_read(PCCR) & 0xfffc0fff);
  45         sysreg_write(PCCR, val);
  46         return count;
  47 }
  48 static ssize_t show_pc0count(struct sys_device *dev, char *buf)
  49 {
  50         unsigned long pcnt0;
  51
  52         pcnt0 = sysreg_read(PCNT0);
  53         return sprintf(buf, "%lu\n", pcnt0);
  54 }
  55 static ssize_t store_pc0count(struct sys_device *dev, const char *buf,
  56                               size_t count)
  57 {
  58         unsigned long val;
  59         char *endp;
  60
  61         val = simple_strtoul(buf, &endp, 0);
  62         if (endp == buf)
  63                 return -EINVAL;
  64         sysreg_write(PCNT0, val);
  65
  66         return count;
  67 }
  68
  69 static ssize_t show_pc1event(struct sys_device *dev, char *buf)
  70 {
  71         unsigned long pccr;
  72
  73         pccr = sysreg_read(PCCR);
  74         return sprintf(buf, "0x%lx\n", (pccr >> 18) & 0x3f);
  75 }
  76 static ssize_t store_pc1event(struct sys_device *dev, const char *buf,
  77                               size_t count)
  78 {
  79         unsigned long val;
  80         char *endp;
  81
  82         val = simple_strtoul(buf, &endp, 0);
  83         if (endp == buf || val > 0x3f)
  84                 return -EINVAL;
  85         val = (val << 18) | (sysreg_read(PCCR) & 0xff03ffff);
  86         sysreg_write(PCCR, val);
  87         return count;
  88 }
  89 static ssize_t show_pc1count(struct sys_device *dev, char *buf)
  90 {
  91         unsigned long pcnt1;
  92
  93         pcnt1 = sysreg_read(PCNT1);
  94         return sprintf(buf, "%lu\n", pcnt1);
  95 }
  96 static ssize_t store_pc1count(struct sys_device *dev, const char *buf,
  97                               size_t count)
  98 {
  99         unsigned long val;
 100         char *endp;
 101
 102         val = simple_strtoul(buf, &endp, 0);
 103         if (endp == buf)
 104                 return -EINVAL;
 105         sysreg_write(PCNT1, val);
 106
 107         return count;
 108 }
 109
 110 static ssize_t show_pccycles(struct sys_device *dev, char *buf)
 111 {
 112         unsigned long pccnt;
 113
 114         pccnt = sysreg_read(PCCNT);
 115         return sprintf(buf, "%lu\n", pccnt);
 116 }
 117 static ssize_t store_pccycles(struct sys_device *dev, const char *buf,
 118                               size_t count)
 119 {
 120         unsigned long val;
 121         char *endp;
 122
 123         val = simple_strtoul(buf, &endp, 0);
 124         if (endp == buf)
 125                 return -EINVAL;
 126         sysreg_write(PCCNT, val);
 127
 128         return count;
 129 }
 130
 131 static ssize_t show_pcenable(struct sys_device *dev, char *buf)
 132 {
 133         unsigned long pccr;
 134
 135         pccr = sysreg_read(PCCR);
 136         return sprintf(buf, "%c\n", (pccr & 1)?'1':'0');
 137 }
 138 static ssize_t store_pcenable(struct sys_device *dev, const char *buf,
 139                               size_t count)
 140 {
 141         unsigned long pccr, val;
 142         char *endp;
 143
 144         val = simple_strtoul(buf, &endp, 0);
 145         if (endp == buf)
 146                 return -EINVAL;
 147         if (val)
 148                 val = 1;
 149
 150         pccr = sysreg_read(PCCR);
 151         pccr = (pccr & ~1UL) | val;
 152         sysreg_write(PCCR, pccr);
 153
 154         return count;
 155 }
 156
 157 static SYSDEV_ATTR(pc0event, 0600, show_pc0event, store_pc0event);
 158 static SYSDEV_ATTR(pc0count, 0600, show_pc0count, store_pc0count);
 159 static SYSDEV_ATTR(pc1event, 0600, show_pc1event, store_pc1event);
 160 static SYSDEV_ATTR(pc1count, 0600, show_pc1count, store_pc1count);
 161 static SYSDEV_ATTR(pccycles, 0600, show_pccycles, store_pccycles);
 162 static SYSDEV_ATTR(pcenable, 0600, show_pcenable, store_pcenable);
 163
 164 #endif /* CONFIG_PERFORMANCE_COUNTERS */
 165
 166 static int __init topology_init(void)
 167 {
 168         int cpu;
 169
 170         for_each_possible_cpu(cpu) {
 171                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 172
 173                 register_cpu(c, cpu);
 174
 175 #ifdef CONFIG_PERFORMANCE_COUNTERS
 176                 sysdev_create_file(&c->sysdev, &attr_pc0event);
 177                 sysdev_create_file(&c->sysdev, &attr_pc0count);
 178                 sysdev_create_file(&c->sysdev, &attr_pc1event);
 179                 sysdev_create_file(&c->sysdev, &attr_pc1count);
 180                 sysdev_create_file(&c->sysdev, &attr_pccycles);
 181                 sysdev_create_file(&c->sysdev, &attr_pcenable);
 182 #endif
 183         }
 184
 185         return 0;
 186 }
 187
 188 subsys_initcall(topology_init);
 189
 190 static const char *cpu_names[] = {
 191         "Morgan",
 192         "AP7000",
 193 };
 194 #define NR_CPU_NAMES ARRAY_SIZE(cpu_names)
 195
 196 static const char *arch_names[] = {
 197         "AVR32A",
 198         "AVR32B",
 199 };
 200 #define NR_ARCH_NAMES ARRAY_SIZE(arch_names)
 201
 202 static const char *mmu_types[] = {
 203         "No MMU",
 204         "ITLB and DTLB",
 205         "Shared TLB",
 206         "MPU"
 207 };
 208
 209 void __init setup_processor(void)
 210 {
 211         unsigned long config0, config1;
 212         unsigned long features;
 213         unsigned cpu_id, cpu_rev, arch_id, arch_rev, mmu_type;
 214         unsigned tmp;
 215
 216         config0 = sysreg_read(CONFIG0);
 217         config1 = sysreg_read(CONFIG1);
 218         cpu_id = SYSREG_BFEXT(PROCESSORID, config0);
 219         cpu_rev = SYSREG_BFEXT(PROCESSORREVISION, config0);
 220         arch_id = SYSREG_BFEXT(AT, config0);
 221         arch_rev = SYSREG_BFEXT(AR, config0);
 222         mmu_type = SYSREG_BFEXT(MMUT, config0);
 223
 224         boot_cpu_data.arch_type = arch_id;
 225         boot_cpu_data.cpu_type = cpu_id;
 226         boot_cpu_data.arch_revision = arch_rev;
 227         boot_cpu_data.cpu_revision = cpu_rev;
 228         boot_cpu_data.tlb_config = mmu_type;
 229
 230         tmp = SYSREG_BFEXT(ILSZ, config1);
 231         if (tmp) {
 232                 boot_cpu_data.icache.ways = 1 << SYSREG_BFEXT(IASS, config1);
 233                 boot_cpu_data.icache.sets = 1 << SYSREG_BFEXT(ISET, config1);
 234                 boot_cpu_data.icache.linesz = 1 << (tmp + 1);
 235         }
 236         tmp = SYSREG_BFEXT(DLSZ, config1);
 237         if (tmp) {
 238                 boot_cpu_data.dcache.ways = 1 << SYSREG_BFEXT(DASS, config1);
 239                 boot_cpu_data.dcache.sets = 1 << SYSREG_BFEXT(DSET, config1);
 240                 boot_cpu_data.dcache.linesz = 1 << (tmp + 1);
 241         }
 242
 243         if ((cpu_id >= NR_CPU_NAMES) || (arch_id >= NR_ARCH_NAMES)) {
 244                 printk ("Unknown CPU configuration (ID %02x, arch %02x), "
 245                         "continuing anyway...\n",
 246                         cpu_id, arch_id);
 247                 return;
 248         }
 249
 250         printk ("CPU: %s [%02x] revision %d (%s revision %d)\n",
 251                 cpu_names[cpu_id], cpu_id, cpu_rev,
 252                 arch_names[arch_id], arch_rev);
 253         printk ("CPU: MMU configuration: %s\n", mmu_types[mmu_type]);
 254
 255         printk ("CPU: features:");
 256         features = 0;
 257         if (config0 & SYSREG_BIT(CONFIG0_R)) {
 258                 features |= AVR32_FEATURE_RMW;
 259                 printk(" rmw");
 260         }
 261         if (config0 & SYSREG_BIT(CONFIG0_D)) {
 262                 features |= AVR32_FEATURE_DSP;
 263                 printk(" dsp");
 264         }
 265         if (config0 & SYSREG_BIT(CONFIG0_S)) {
 266                 features |= AVR32_FEATURE_SIMD;
 267                 printk(" simd");
 268         }
 269         if (config0 & SYSREG_BIT(CONFIG0_O)) {
 270                 features |= AVR32_FEATURE_OCD;
 271                 printk(" ocd");
 272         }
 273         if (config0 & SYSREG_BIT(CONFIG0_P)) {
 274                 features |= AVR32_FEATURE_PCTR;
 275                 printk(" perfctr");
 276         }
 277         if (config0 & SYSREG_BIT(CONFIG0_J)) {
 278                 features |= AVR32_FEATURE_JAVA;
 279                 printk(" java");
 280         }
 281         if (config0 & SYSREG_BIT(CONFIG0_F)) {
 282                 features |= AVR32_FEATURE_FPU;
 283                 printk(" fpu");
 284         }
 285         printk("\n");
 286         boot_cpu_data.features = features;
 287 }
 288
 289 #ifdef CONFIG_PROC_FS
 290 static int c_show(struct seq_file *m, void *v)
 291 {
 292         unsigned int icache_size, dcache_size;
 293         unsigned int cpu = smp_processor_id();
 294
 295         icache_size = boot_cpu_data.icache.ways *
 296                 boot_cpu_data.icache.sets *
 297                 boot_cpu_data.icache.linesz;
 298         dcache_size = boot_cpu_data.dcache.ways *
 299                 boot_cpu_data.dcache.sets *
 300                 boot_cpu_data.dcache.linesz;
 301
 302         seq_printf(m, "processor\t: %d\n", cpu);
 303
 304         if (boot_cpu_data.arch_type < NR_ARCH_NAMES)
 305                 seq_printf(m, "cpu family\t: %s revision %d\n",
 306                            arch_names[boot_cpu_data.arch_type],
 307                            boot_cpu_data.arch_revision);
 308         if (boot_cpu_data.cpu_type < NR_CPU_NAMES)
 309                 seq_printf(m, "cpu type\t: %s revision %d\n",
 310                            cpu_names[boot_cpu_data.cpu_type],
 311                            boot_cpu_data.cpu_revision);
 312
 313         seq_printf(m, "i-cache\t\t: %dK (%u ways x %u sets x %u)\n",
 314                    icache_size >> 10,
 315                    boot_cpu_data.icache.ways,
 316                    boot_cpu_data.icache.sets,
 317                    boot_cpu_data.icache.linesz);
 318         seq_printf(m, "d-cache\t\t: %dK (%u ways x %u sets x %u)\n",
 319                    dcache_size >> 10,
 320                    boot_cpu_data.dcache.ways,
 321                    boot_cpu_data.dcache.sets,
 322                    boot_cpu_data.dcache.linesz);
 323         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 324                    boot_cpu_data.loops_per_jiffy / (500000/HZ),
 325                    (boot_cpu_data.loops_per_jiffy / (5000/HZ)) % 100);
 326
 327         return 0;
 328 }
 329
 330 static void *c_start(struct seq_file *m, loff_t *pos)
 331 {
 332         return *pos < 1 ? (void *)1 : NULL;
 333 }
 334
 335 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 336 {
 337         ++*pos;
 338         return NULL;
 339 }
 340
 341 static void c_stop(struct seq_file *m, void *v)
 342 {
 343
 344 }
 345
 346 struct seq_operations cpuinfo_op = {
 347         .start  = c_start,
 348         .next   = c_next,
 349         .stop   = c_stop,
 350         .show   = c_show
 351 };
 352 #endif /* CONFIG_PROC_FS */