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   1 /*
   2  * arch/sh/oprofile/op_model_sh7750.c
   3  *
   4  * OProfile support for SH7750/SH7750S Performance Counters
   5  *
   6  * Copyright (C) 2003 - 2008  Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/oprofile.h>
  14 #include <linux/profile.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/fs.h>
  20 #include "op_impl.h"
  21
  22 #define PM_CR_BASE      0xff000084      /* 16-bit */
  23 #define PM_CTR_BASE     0xff100004      /* 32-bit */
  24
  25 #define PMCR(n)         (PM_CR_BASE + ((n) * 0x04))
  26 #define PMCTRH(n)       (PM_CTR_BASE + 0x00 + ((n) * 0x08))
  27 #define PMCTRL(n)       (PM_CTR_BASE + 0x04 + ((n) * 0x08))
  28
  29 #define PMCR_PMM_MASK   0x0000003f
  30
  31 #define PMCR_CLKF       0x00000100
  32 #define PMCR_PMCLR      0x00002000
  33 #define PMCR_PMST       0x00004000
  34 #define PMCR_PMEN       0x00008000
  35
  36 struct op_sh_model op_model_sh7750_ops;
  37
  38 #define NR_CNTRS        2
  39
  40 static struct sh7750_ppc_register_config {
  41         unsigned int ctrl;
  42         unsigned long cnt_hi;
  43         unsigned long cnt_lo;
  44 } regcache[NR_CNTRS];
  45
  46 /*
  47  * There are a number of events supported by each counter (33 in total).
  48  * Since we have 2 counters, each counter will take the event code as it
  49  * corresponds to the PMCR PMM setting. Each counter can be configured
  50  * independently.
  51  *
  52  *      Event Code      Description
  53  *      ----------      -----------
  54  *
  55  *      0x01            Operand read access
  56  *      0x02            Operand write access
  57  *      0x03            UTLB miss
  58  *      0x04            Operand cache read miss
  59  *      0x05            Operand cache write miss
  60  *      0x06            Instruction fetch (w/ cache)
  61  *      0x07            Instruction TLB miss
  62  *      0x08            Instruction cache miss
  63  *      0x09            All operand accesses
  64  *      0x0a            All instruction accesses
  65  *      0x0b            OC RAM operand access
  66  *      0x0d            On-chip I/O space access
  67  *      0x0e            Operand access (r/w)
  68  *      0x0f            Operand cache miss (r/w)
  69  *      0x10            Branch instruction
  70  *      0x11            Branch taken
  71  *      0x12            BSR/BSRF/JSR
  72  *      0x13            Instruction execution
  73  *      0x14            Instruction execution in parallel
  74  *      0x15            FPU Instruction execution
  75  *      0x16            Interrupt
  76  *      0x17            NMI
  77  *      0x18            trapa instruction execution
  78  *      0x19            UBCA match
  79  *      0x1a            UBCB match
  80  *      0x21            Instruction cache fill
  81  *      0x22            Operand cache fill
  82  *      0x23            Elapsed time
  83  *      0x24            Pipeline freeze by I-cache miss
  84  *      0x25            Pipeline freeze by D-cache miss
  85  *      0x27            Pipeline freeze by branch instruction
  86  *      0x28            Pipeline freeze by CPU register
  87  *      0x29            Pipeline freeze by FPU
  88  *
  89  * Unfortunately we don't have a native exception or interrupt for counter
  90  * overflow (although since these counters can run for 16.3 days without
  91  * overflowing, it's not really necessary).
  92  *
  93  * OProfile on the other hand likes to have samples taken periodically, so
  94  * for now we just piggyback the timer interrupt to get the expected
  95  * behavior.
  96  */
  97
  98 static int sh7750_timer_notify(struct pt_regs *regs)
  99 {
 100         oprofile_add_sample(regs, 0);
 101         return 0;
 102 }
 103
 104 static u64 sh7750_read_counter(int counter)
 105 {
 106         return (u64)((u64)(__raw_readl(PMCTRH(counter)) & 0xffff) << 32) |
 107                            __raw_readl(PMCTRL(counter));
 108 }
 109
 110 /*
 111  * Files will be in a path like:
 112  *
 113  *  /<oprofilefs mount point>/<counter number>/<file>
 114  *
 115  * So when dealing with <file>, we look to the parent dentry for the counter
 116  * number.
 117  */
 118 static inline int to_counter(struct file *file)
 119 {
 120         const unsigned char *name = file->f_path.dentry->d_parent->d_name.name;
 121
 122         return (int)simple_strtol(name, NULL, 10);
 123 }
 124
 125 /*
 126  * XXX: We have 48-bit counters, so we're probably going to want something
 127  * more along the lines of oprofilefs_ullong_to_user().. Truncating to
 128  * unsigned long works fine for now though, as long as we don't attempt to
 129  * profile for too horribly long.
 130  */
 131 static ssize_t sh7750_read_count(struct file *file, char __user *buf,
 132                                  size_t count, loff_t *ppos)
 133 {
 134         int counter = to_counter(file);
 135         u64 val = sh7750_read_counter(counter);
 136
 137         return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
 138 }
 139
 140 static ssize_t sh7750_write_count(struct file *file, const char __user *buf,
 141                                   size_t count, loff_t *ppos)
 142 {
 143         int counter = to_counter(file);
 144         unsigned long val;
 145
 146         if (oprofilefs_ulong_from_user(&val, buf, count))
 147                 return -EFAULT;
 148
 149         /*
 150          * Any write will clear the counter, although only 0 should be
 151          * written for this purpose, as we do not support setting the
 152          * counter to an arbitrary value.
 153          */
 154         WARN_ON(val != 0);
 155
 156         __raw_writew(__raw_readw(PMCR(counter)) | PMCR_PMCLR, PMCR(counter));
 157
 158         return count;
 159 }
 160
 161 static const struct file_operations count_fops = {
 162         .read           = sh7750_read_count,
 163         .write          = sh7750_write_count,
 164 };
 165
 166 static int sh7750_ppc_create_files(struct super_block *sb, struct dentry *dir)
 167 {
 168         return oprofilefs_create_file(sb, dir, "count", &count_fops);
 169 }
 170
 171 static void sh7750_ppc_reg_setup(struct op_counter_config *ctr)
 172 {
 173         unsigned int counters = op_model_sh7750_ops.num_counters;
 174         int i;
 175
 176         for (i = 0; i < counters; i++) {
 177                 regcache[i].ctrl        = 0;
 178                 regcache[i].cnt_hi      = 0;
 179                 regcache[i].cnt_lo      = 0;
 180
 181                 if (!ctr[i].enabled)
 182                         continue;
 183
 184                 regcache[i].ctrl |= ctr[i].event | PMCR_PMEN | PMCR_PMST;
 185                 regcache[i].cnt_hi = (unsigned long)((ctr->count >> 32) & 0xffff);
 186                 regcache[i].cnt_lo = (unsigned long)(ctr->count & 0xffffffff);
 187         }
 188 }
 189
 190 static void sh7750_ppc_cpu_setup(void *args)
 191 {
 192         unsigned int counters = op_model_sh7750_ops.num_counters;
 193         int i;
 194
 195         for (i = 0; i < counters; i++) {
 196                 __raw_writew(0, PMCR(i));
 197                 __raw_writel(regcache[i].cnt_hi, PMCTRH(i));
 198                 __raw_writel(regcache[i].cnt_lo, PMCTRL(i));
 199         }
 200 }
 201
 202 static void sh7750_ppc_cpu_start(void *args)
 203 {
 204         unsigned int counters = op_model_sh7750_ops.num_counters;
 205         int i;
 206
 207         for (i = 0; i < counters; i++)
 208                 __raw_writew(regcache[i].ctrl, PMCR(i));
 209 }
 210
 211 static void sh7750_ppc_cpu_stop(void *args)
 212 {
 213         unsigned int counters = op_model_sh7750_ops.num_counters;
 214         int i;
 215
 216         /* Disable the counters */
 217         for (i = 0; i < counters; i++)
 218                 __raw_writew(__raw_readw(PMCR(i)) & ~PMCR_PMEN, PMCR(i));
 219 }
 220
 221 static inline void sh7750_ppc_reset(void)
 222 {
 223         unsigned int counters = op_model_sh7750_ops.num_counters;
 224         int i;
 225
 226         /* Clear the counters */
 227         for (i = 0; i < counters; i++)
 228                 __raw_writew(__raw_readw(PMCR(i)) | PMCR_PMCLR, PMCR(i));
 229 }
 230
 231 static int sh7750_ppc_init(void)
 232 {
 233         sh7750_ppc_reset();
 234
 235         return register_timer_hook(sh7750_timer_notify);
 236 }
 237
 238 static void sh7750_ppc_exit(void)
 239 {
 240         unregister_timer_hook(sh7750_timer_notify);
 241
 242         sh7750_ppc_reset();
 243 }
 244
 245 struct op_sh_model op_model_sh7750_ops = {
 246         .cpu_type       = "sh/sh7750",
 247         .num_counters   = NR_CNTRS,
 248         .reg_setup      = sh7750_ppc_reg_setup,
 249         .cpu_setup      = sh7750_ppc_cpu_setup,
 250         .cpu_start      = sh7750_ppc_cpu_start,
 251         .cpu_stop       = sh7750_ppc_cpu_stop,
 252         .init           = sh7750_ppc_init,
 253         .exit           = sh7750_ppc_exit,
 254         .create_files   = sh7750_ppc_create_files,
 255 };