+++ /dev/null
-/*
- * arch/sh/oprofile/op_model_sh7750.c
- *
- * OProfile support for SH7750/SH7750S Performance Counters
- *
- * Copyright (C) 2003 - 2008 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/kernel.h>
-#include <linux/oprofile.h>
-#include <linux/profile.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/fs.h>
-#include "op_impl.h"
-
-#define PM_CR_BASE 0xff000084 /* 16-bit */
-#define PM_CTR_BASE 0xff100004 /* 32-bit */
-
-#define PMCR(n) (PM_CR_BASE + ((n) * 0x04))
-#define PMCTRH(n) (PM_CTR_BASE + 0x00 + ((n) * 0x08))
-#define PMCTRL(n) (PM_CTR_BASE + 0x04 + ((n) * 0x08))
-
-#define PMCR_PMM_MASK 0x0000003f
-
-#define PMCR_CLKF 0x00000100
-#define PMCR_PMCLR 0x00002000
-#define PMCR_PMST 0x00004000
-#define PMCR_PMEN 0x00008000
-
-struct op_sh_model op_model_sh7750_ops;
-
-#define NR_CNTRS 2
-
-static struct sh7750_ppc_register_config {
- unsigned int ctrl;
- unsigned long cnt_hi;
- unsigned long cnt_lo;
-} regcache[NR_CNTRS];
-
-/*
- * There are a number of events supported by each counter (33 in total).
- * Since we have 2 counters, each counter will take the event code as it
- * corresponds to the PMCR PMM setting. Each counter can be configured
- * independently.
- *
- * Event Code Description
- * ---------- -----------
- *
- * 0x01 Operand read access
- * 0x02 Operand write access
- * 0x03 UTLB miss
- * 0x04 Operand cache read miss
- * 0x05 Operand cache write miss
- * 0x06 Instruction fetch (w/ cache)
- * 0x07 Instruction TLB miss
- * 0x08 Instruction cache miss
- * 0x09 All operand accesses
- * 0x0a All instruction accesses
- * 0x0b OC RAM operand access
- * 0x0d On-chip I/O space access
- * 0x0e Operand access (r/w)
- * 0x0f Operand cache miss (r/w)
- * 0x10 Branch instruction
- * 0x11 Branch taken
- * 0x12 BSR/BSRF/JSR
- * 0x13 Instruction execution
- * 0x14 Instruction execution in parallel
- * 0x15 FPU Instruction execution
- * 0x16 Interrupt
- * 0x17 NMI
- * 0x18 trapa instruction execution
- * 0x19 UBCA match
- * 0x1a UBCB match
- * 0x21 Instruction cache fill
- * 0x22 Operand cache fill
- * 0x23 Elapsed time
- * 0x24 Pipeline freeze by I-cache miss
- * 0x25 Pipeline freeze by D-cache miss
- * 0x27 Pipeline freeze by branch instruction
- * 0x28 Pipeline freeze by CPU register
- * 0x29 Pipeline freeze by FPU
- *
- * Unfortunately we don't have a native exception or interrupt for counter
- * overflow (although since these counters can run for 16.3 days without
- * overflowing, it's not really necessary).
- *
- * OProfile on the other hand likes to have samples taken periodically, so
- * for now we just piggyback the timer interrupt to get the expected
- * behavior.
- */
-
-static int sh7750_timer_notify(struct pt_regs *regs)
-{
- oprofile_add_sample(regs, 0);
- return 0;
-}
-
-static u64 sh7750_read_counter(int counter)
-{
- return (u64)((u64)(__raw_readl(PMCTRH(counter)) & 0xffff) << 32) |
- __raw_readl(PMCTRL(counter));
-}
-
-/*
- * Files will be in a path like:
- *
- * /<oprofilefs mount point>/<counter number>/<file>
- *
- * So when dealing with <file>, we look to the parent dentry for the counter
- * number.
- */
-static inline int to_counter(struct file *file)
-{
- const unsigned char *name = file->f_path.dentry->d_parent->d_name.name;
-
- return (int)simple_strtol(name, NULL, 10);
-}
-
-/*
- * XXX: We have 48-bit counters, so we're probably going to want something
- * more along the lines of oprofilefs_ullong_to_user().. Truncating to
- * unsigned long works fine for now though, as long as we don't attempt to
- * profile for too horribly long.
- */
-static ssize_t sh7750_read_count(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- int counter = to_counter(file);
- u64 val = sh7750_read_counter(counter);
-
- return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos);
-}
-
-static ssize_t sh7750_write_count(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- int counter = to_counter(file);
- unsigned long val;
-
- if (oprofilefs_ulong_from_user(&val, buf, count))
- return -EFAULT;
-
- /*
- * Any write will clear the counter, although only 0 should be
- * written for this purpose, as we do not support setting the
- * counter to an arbitrary value.
- */
- WARN_ON(val != 0);
-
- __raw_writew(__raw_readw(PMCR(counter)) | PMCR_PMCLR, PMCR(counter));
-
- return count;
-}
-
-static const struct file_operations count_fops = {
- .read = sh7750_read_count,
- .write = sh7750_write_count,
-};
-
-static int sh7750_ppc_create_files(struct super_block *sb, struct dentry *dir)
-{
- return oprofilefs_create_file(sb, dir, "count", &count_fops);
-}
-
-static void sh7750_ppc_reg_setup(struct op_counter_config *ctr)
-{
- unsigned int counters = op_model_sh7750_ops.num_counters;
- int i;
-
- for (i = 0; i < counters; i++) {
- regcache[i].ctrl = 0;
- regcache[i].cnt_hi = 0;
- regcache[i].cnt_lo = 0;
-
- if (!ctr[i].enabled)
- continue;
-
- regcache[i].ctrl |= ctr[i].event | PMCR_PMEN | PMCR_PMST;
- regcache[i].cnt_hi = (unsigned long)((ctr->count >> 32) & 0xffff);
- regcache[i].cnt_lo = (unsigned long)(ctr->count & 0xffffffff);
- }
-}
-
-static void sh7750_ppc_cpu_setup(void *args)
-{
- unsigned int counters = op_model_sh7750_ops.num_counters;
- int i;
-
- for (i = 0; i < counters; i++) {
- __raw_writew(0, PMCR(i));
- __raw_writel(regcache[i].cnt_hi, PMCTRH(i));
- __raw_writel(regcache[i].cnt_lo, PMCTRL(i));
- }
-}
-
-static void sh7750_ppc_cpu_start(void *args)
-{
- unsigned int counters = op_model_sh7750_ops.num_counters;
- int i;
-
- for (i = 0; i < counters; i++)
- __raw_writew(regcache[i].ctrl, PMCR(i));
-}
-
-static void sh7750_ppc_cpu_stop(void *args)
-{
- unsigned int counters = op_model_sh7750_ops.num_counters;
- int i;
-
- /* Disable the counters */
- for (i = 0; i < counters; i++)
- __raw_writew(__raw_readw(PMCR(i)) & ~PMCR_PMEN, PMCR(i));
-}
-
-static inline void sh7750_ppc_reset(void)
-{
- unsigned int counters = op_model_sh7750_ops.num_counters;
- int i;
-
- /* Clear the counters */
- for (i = 0; i < counters; i++)
- __raw_writew(__raw_readw(PMCR(i)) | PMCR_PMCLR, PMCR(i));
-}
-
-static int sh7750_ppc_init(void)
-{
- sh7750_ppc_reset();
-
- return register_timer_hook(sh7750_timer_notify);
-}
-
-static void sh7750_ppc_exit(void)
-{
- unregister_timer_hook(sh7750_timer_notify);
-
- sh7750_ppc_reset();
-}
-
-struct op_sh_model op_model_sh7750_ops = {
- .cpu_type = "sh/sh7750",
- .num_counters = NR_CNTRS,
- .reg_setup = sh7750_ppc_reg_setup,
- .cpu_setup = sh7750_ppc_cpu_setup,
- .cpu_start = sh7750_ppc_cpu_start,
- .cpu_stop = sh7750_ppc_cpu_stop,
- .init = sh7750_ppc_init,
- .exit = sh7750_ppc_exit,
- .create_files = sh7750_ppc_create_files,
-};
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff