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Diffstat (limited to 'gator_events_mmaped.c')
| -rw-r--r-- | gator_events_mmaped.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/gator_events_mmaped.c b/gator_events_mmaped.c new file mode 100644 index 0000000..6884684 --- /dev/null +++ b/gator_events_mmaped.c @@ -0,0 +1,196 @@ +/* + * Example events provider + * + * Copyright (C) ARM Limited 2010-2011. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Similar entires must be present in events.xml file: + * + * <counter_set name="mmaped_cntX"> + * <counter name="mmaped_cnt0"/> + * <counter name="mmaped_cnt1"/> + * </counter_set> + * <category name="mmaped" counter_set="mmaped_cntX" per_cpu="no"> + * <event event="0x0" title="Simulated" name="Sine" description="Sort-of-sine"/> + * <event event="0x1" title="Simulated" name="Triangle" description="Triangular wave"/> + * <event event="0x2" title="Simulated" name="PWM" description="PWM Signal"/> + * </category> + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/ratelimit.h> + +#include "gator.h" + +#define MMAPED_COUNTERS_NUM 3 + +static struct { + unsigned long enabled; + unsigned long event; + unsigned long key; +} mmaped_counters[MMAPED_COUNTERS_NUM]; + +static int mmaped_buffer[MMAPED_COUNTERS_NUM * 2]; + +#ifdef TODO +static void __iomem *mmaped_base; +#endif + +/* Adds mmaped_cntX directories and enabled, event, and key files to /dev/gator/events */ +static int gator_events_mmaped_create_files(struct super_block *sb, + struct dentry *root) +{ + int i; + + for (i = 0; i < MMAPED_COUNTERS_NUM; i++) { + char buf[16]; + struct dentry *dir; + + snprintf(buf, sizeof(buf), "mmaped_cnt%d", i); + dir = gatorfs_mkdir(sb, root, buf); + if (WARN_ON(!dir)) + return -1; + gatorfs_create_ulong(sb, dir, "enabled", + &mmaped_counters[i].enabled); + gatorfs_create_ulong(sb, dir, "event", + &mmaped_counters[i].event); + gatorfs_create_ro_ulong(sb, dir, "key", + &mmaped_counters[i].key); + } + + return 0; +} + +static int gator_events_mmaped_start(void) +{ +#ifdef TODO + for (i = 0; i < MMAPED_COUNTERS_NUM; i++) + writel(mmaped_counters[i].event, + mmaped_base + COUNTERS_CONFIG_OFFSET[i]); + + writel(ENABLED, COUNTERS_CONTROL_OFFSET); +#endif + + return 0; +} + +static void gator_events_mmaped_stop(void) +{ +#ifdef TODO + writel(DISABLED, COUNTERS_CONTROL_OFFSET); +#endif +} + +#ifndef TODO +/* This function "simulates" counters, generating values of fancy + * functions like sine or triangle... */ +static int mmaped_simulate(int counter) +{ + int result = 0; + + switch (counter) { + case 0: /* sort-of-sine */ + { + static int t; + int x; + + if (t % 1024 < 512) + x = 512 - (t % 512); + else + x = t % 512; + + result = 32 * x / 512; + result = result * result; + + if (t < 1024) + result = 1922 - result; + + t = (t + 1) % 2048; + } + break; + case 1: /* triangle */ + { + static int v, d = 1; + + v += d; + if (v % 2000 == 0) + d = -d; + + result = v; + } + break; + case 2: /* PWM signal */ + { + static int t, dc; + + t = (t + 1) % 2000; + if (t % 100) + dc = (dc + 200) % 2000; + + result = t < dc ? 0 : 2000; + } + break; + } + + return result; +} +#endif + +static int gator_events_mmaped_read(int **buffer) +{ + int i; + int len = 0; + + /* System wide counters - read from one core only */ + if (smp_processor_id()) + return 0; + + for (i = 0; i < MMAPED_COUNTERS_NUM; i++) { + if (mmaped_counters[i].enabled) { + mmaped_buffer[len++] = mmaped_counters[i].key; +#ifdef TODO + mmaped_buffer[len++] = readl(mmaped_base + + COUNTERS_VALUE_OFFSET[i]); +#else + mmaped_buffer[len++] = mmaped_simulate( + mmaped_counters[i].event); +#endif + } + } + + if (buffer) + *buffer = mmaped_buffer; + + return len; +} + +static struct gator_interface gator_events_mmaped_interface = { + .create_files = gator_events_mmaped_create_files, + .start = gator_events_mmaped_start, + .stop = gator_events_mmaped_stop, + .read = gator_events_mmaped_read, +}; + +/* Must not be static! */ +int __init gator_events_mmaped_init(void) +{ + int i; + +#ifdef TODO + mmaped_base = ioremap(COUNTERS_PHYS_ADDR, SZ_4K); + if (!mmaped_base) + return -ENOMEM; +#endif + + for (i = 0; i < MMAPED_COUNTERS_NUM; i++) { + mmaped_counters[i].enabled = 0; + mmaped_counters[i].key = gator_events_get_key(); + } + + return gator_events_install(&gator_events_mmaped_interface); +} +gator_events_init(gator_events_mmaped_init); |