diff options
Diffstat (limited to 'drivers/gator/gator_events_l2c-310.c')
| -rw-r--r-- | drivers/gator/gator_events_l2c-310.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/gator/gator_events_l2c-310.c b/drivers/gator/gator_events_l2c-310.c new file mode 100644 index 00000000000..21aa4a214d9 --- /dev/null +++ b/drivers/gator/gator_events_l2c-310.c @@ -0,0 +1,210 @@ +/** + * l2c310 (L2 Cache Controller) event counters for gator + * + * Copyright (C) ARM Limited 2010-2013. 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. + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#if defined(CONFIG_OF) +#include <linux/of.h> +#include <linux/of_address.h> +#endif +#include <asm/hardware/cache-l2x0.h> + +#include "gator.h" + +#define L2C310_COUNTERS_NUM 2 + +static struct { + unsigned long enabled; + unsigned long event; + unsigned long key; +} l2c310_counters[L2C310_COUNTERS_NUM]; + +static int l2c310_buffer[L2C310_COUNTERS_NUM * 2]; + +static void __iomem *l2c310_base; + +static void gator_events_l2c310_reset_counters(void) +{ + u32 val = readl(l2c310_base + L2X0_EVENT_CNT_CTRL); + + val |= ((1 << L2C310_COUNTERS_NUM) - 1) << 1; + + writel(val, l2c310_base + L2X0_EVENT_CNT_CTRL); +} + +static int gator_events_l2c310_create_files(struct super_block *sb, + struct dentry *root) +{ + int i; + + for (i = 0; i < L2C310_COUNTERS_NUM; i++) { + char buf[16]; + struct dentry *dir; + + snprintf(buf, sizeof(buf), "L2C-310_cnt%d", i); + dir = gatorfs_mkdir(sb, root, buf); + if (WARN_ON(!dir)) + return -1; + gatorfs_create_ulong(sb, dir, "enabled", + &l2c310_counters[i].enabled); + gatorfs_create_ulong(sb, dir, "event", + &l2c310_counters[i].event); + gatorfs_create_ro_ulong(sb, dir, "key", + &l2c310_counters[i].key); + } + + return 0; +} + +static int gator_events_l2c310_start(void) +{ + static const unsigned long l2x0_event_cntx_cfg[L2C310_COUNTERS_NUM] = { + L2X0_EVENT_CNT0_CFG, + L2X0_EVENT_CNT1_CFG, + }; + int i; + + /* Counter event sources */ + for (i = 0; i < L2C310_COUNTERS_NUM; i++) + writel((l2c310_counters[i].event & 0xf) << 2, + l2c310_base + l2x0_event_cntx_cfg[i]); + + gator_events_l2c310_reset_counters(); + + /* Event counter enable */ + writel(1, l2c310_base + L2X0_EVENT_CNT_CTRL); + + return 0; +} + +static void gator_events_l2c310_stop(void) +{ + /* Event counter disable */ + writel(0, l2c310_base + L2X0_EVENT_CNT_CTRL); +} + +static int gator_events_l2c310_read(int **buffer) +{ + static const unsigned long l2x0_event_cntx_val[L2C310_COUNTERS_NUM] = { + L2X0_EVENT_CNT0_VAL, + L2X0_EVENT_CNT1_VAL, + }; + int i; + int len = 0; + + if (!on_primary_core()) + return 0; + + for (i = 0; i < L2C310_COUNTERS_NUM; i++) { + if (l2c310_counters[i].enabled) { + l2c310_buffer[len++] = l2c310_counters[i].key; + l2c310_buffer[len++] = readl(l2c310_base + + l2x0_event_cntx_val[i]); + } + } + + /* l2c310 counters are saturating, not wrapping in case of overflow */ + gator_events_l2c310_reset_counters(); + + if (buffer) + *buffer = l2c310_buffer; + + return len; +} + +static struct gator_interface gator_events_l2c310_interface = { + .create_files = gator_events_l2c310_create_files, + .start = gator_events_l2c310_start, + .stop = gator_events_l2c310_stop, + .read = gator_events_l2c310_read, +}; + +#define L2C310_ADDR_PROBE (~0) + +MODULE_PARM_DESC(l2c310_addr, "L2C310 physical base address (0 to disable)"); +static unsigned long l2c310_addr = L2C310_ADDR_PROBE; +module_param(l2c310_addr, ulong, 0444); + +static void __iomem *gator_events_l2c310_probe(void) +{ + phys_addr_t variants[] = { +#if defined(CONFIG_ARCH_EXYNOS4) || defined(CONFIG_ARCH_S5PV310) + 0x10502000, +#endif +#if defined(CONFIG_ARCH_OMAP4) + 0x48242000, +#endif +#if defined(CONFIG_ARCH_TEGRA) + 0x50043000, +#endif +#if defined(CONFIG_ARCH_U8500) + 0xa0412000, +#endif +#if defined(CONFIG_ARCH_VEXPRESS) + 0x1e00a000, // A9x4 core tile (HBI-0191) + 0x2c0f0000, // New memory map tiles +#endif + }; + int i; + void __iomem *base; +#if defined(CONFIG_OF) + struct device_node *node = of_find_all_nodes(NULL); + + if (node) { + of_node_put(node); + + node = of_find_compatible_node(NULL, NULL, "arm,pl310-cache"); + base = of_iomap(node, 0); + of_node_put(node); + + return base; + } +#endif + + for (i = 0; i < ARRAY_SIZE(variants); i++) { + base = ioremap(variants[i], SZ_4K); + if (base) { + u32 cache_id = readl(base + L2X0_CACHE_ID); + + if ((cache_id & 0xff0003c0) == 0x410000c0) + return base; + + iounmap(base); + } + } + + return NULL; +} + +int gator_events_l2c310_init(void) +{ + int i; + + if (gator_cpuid() != CORTEX_A5 && gator_cpuid() != CORTEX_A9) + return -1; + + if (l2c310_addr == L2C310_ADDR_PROBE) + l2c310_base = gator_events_l2c310_probe(); + else if (l2c310_addr) + l2c310_base = ioremap(l2c310_addr, SZ_4K); + + if (!l2c310_base) + return -1; + + for (i = 0; i < L2C310_COUNTERS_NUM; i++) { + l2c310_counters[i].enabled = 0; + l2c310_counters[i].key = gator_events_get_key(); + } + + return gator_events_install(&gator_events_l2c310_interface); +} + +gator_events_init(gator_events_l2c310_init); |