diff options
Diffstat (limited to 'drivers/gator/gator_events_ccn-504.c')
| -rw-r--r-- | drivers/gator/gator_events_ccn-504.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/gator/gator_events_ccn-504.c b/drivers/gator/gator_events_ccn-504.c new file mode 100644 index 00000000000..b91a9a149b9 --- /dev/null +++ b/drivers/gator/gator_events_ccn-504.c @@ -0,0 +1,306 @@ +/** + * Copyright (C) ARM Limited 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. + */ + +/******************************************************************************* + * WARNING: This code is an experimental implementation of the CCN-504 hardware + * counters which has not been tested on the hardware. Commented debug + * statements are present and can be uncommented for diagnostic purposes. + ******************************************************************************/ + +#include <linux/io.h> +#include <linux/module.h> + +#include "gator.h" + +#define PERIPHBASE 0x2E000000 + +#define NUM_REGIONS 256 +#define REGION_SIZE (64*1024) +#define REGION_DEBUG 1 +#define REGION_XP 64 + +// DT (Debug) region +#define PMEVCNTSR0 0x0150 +#define PMCCNTRSR 0x0190 +#define PMCR 0x01A8 +#define PMSR 0x01B0 +#define PMSR_REQ 0x01B8 +#define PMSR_CLR 0x01C0 + +// XP region +#define DT_CONFIG 0x0300 + +// Multiple +#define PMU_EVENT_SEL 0x0600 +#define OLY_ID 0xFF00 + +#define CCNT 4 +#define CNTMAX (4 + 1) + +#define get_pmu_event_id(event) (((event) >> 0) & 0xFF) +#define get_node_type(event) (((event) >> 8) & 0xFF) +#define get_region(event) (((event) >> 16) & 0xFF) + +MODULE_PARM_DESC(ccn504_addr, "CCN-504 physical base address"); +static unsigned long ccn504_addr = 0; +module_param(ccn504_addr, ulong, 0444); + +static void __iomem *gator_events_ccn504_base; +static unsigned long gator_events_ccn504_enabled[CNTMAX]; +static unsigned long gator_events_ccn504_event[CNTMAX]; +static unsigned long gator_events_ccn504_key[CNTMAX]; +static int gator_events_ccn504_buffer[2*CNTMAX]; + +static void gator_events_ccn504_create_shutdown(void) +{ + if (gator_events_ccn504_base != NULL) { + iounmap(gator_events_ccn504_base); + } +} + +static int gator_events_ccn504_create_files(struct super_block *sb, struct dentry *root) +{ + struct dentry *dir; + int i; + char buf[32]; + + for (i = 0; i < CNTMAX; ++i) { + if (i == CCNT) { + snprintf(buf, sizeof(buf), "CCN-504_ccnt"); + } else { + snprintf(buf, sizeof(buf), "CCN-504_cnt%i", i); + } + dir = gatorfs_mkdir(sb, root, buf); + if (!dir) { + return -1; + } + + gatorfs_create_ulong(sb, dir, "enabled", &gator_events_ccn504_enabled[i]); + if (i != CCNT) { + gatorfs_create_ulong(sb, dir, "event", &gator_events_ccn504_event[i]); + } + gatorfs_create_ro_ulong(sb, dir, "key", &gator_events_ccn504_key[i]); + } + + return 0; +} + +static void gator_events_ccn504_set_dt_config(int xp_node_id, int event_num, int value) +{ + u32 dt_config; + + dt_config = readl(gator_events_ccn504_base + (REGION_XP + xp_node_id)*REGION_SIZE + DT_CONFIG); + dt_config |= (value + event_num) << (4*event_num); + //printk(KERN_ERR "%s(%s:%i) writel %x %x\n", __FUNCTION__, __FILE__, __LINE__, dt_config, (REGION_XP + xp_node_id)*REGION_SIZE + DT_CONFIG); + writel(dt_config, gator_events_ccn504_base + (REGION_XP + xp_node_id)*REGION_SIZE + DT_CONFIG); +} + +static int gator_events_ccn504_start(void) +{ + int i; + + // Disable INTREQ on overflow + // [6] ovfl_intr_en = 0 + // perhaps set to 1? + // [5] cntr_rst = 0 + // No register paring + // [4:1] cntcfg = 0 + // Enable PMU features + // [0] pmu_en = 1 + //printk(KERN_ERR "%s(%s:%i) writel %x %x\n", __FUNCTION__, __FILE__, __LINE__, 0x1, REGION_DEBUG*REGION_SIZE + PMCR); + writel(0x1, gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + PMCR); + + // Assume no other pmu_event_sel registers are set + + // cycle counter does not need to be enabled + for (i = 0; i < CCNT; ++i) { + int pmu_event_id; + int node_type; + int region; + u32 pmu_event_sel; + u32 oly_id_whole; + u32 oly_id; + u32 node_id; + + if (!gator_events_ccn504_enabled[i]) { + continue; + } + + pmu_event_id = get_pmu_event_id(gator_events_ccn504_event[i]); + node_type = get_node_type(gator_events_ccn504_event[i]); + region = get_region(gator_events_ccn504_event[i]); + //printk(KERN_ERR "%s(%s:%i) pmu_event_id: %x node_type: %x region: %x\n", __FUNCTION__, __FILE__, __LINE__, pmu_event_id, node_type, region); + + // Verify the node_type + oly_id_whole = readl(gator_events_ccn504_base + region*REGION_SIZE + OLY_ID); + oly_id = oly_id_whole & 0x1F; + node_id = (oly_id_whole >> 8) & 0x7F; + if ((oly_id != node_type) || + ((node_type == 0x16) && ((oly_id == 0x14) || (oly_id == 0x15) || (oly_id == 0x16) || (oly_id == 0x18) || (oly_id == 0x19) || (oly_id == 0x1A)))) { + printk(KERN_ERR "%s(%s:%i) oly_id is %x expected %x\n", __FUNCTION__, __FILE__, __LINE__, oly_id, node_type); + return -1; + } + + // Set the control register + pmu_event_sel = readl(gator_events_ccn504_base + region*REGION_SIZE + PMU_EVENT_SEL); + switch (node_type) { + case 0x08: // XP + pmu_event_sel |= pmu_event_id << (7*i); + gator_events_ccn504_set_dt_config(node_id, i, 0x4); + break; + case 0x04: // HN-F + case 0x16: // RN-I + case 0x10: // SBAS + pmu_event_sel |= pmu_event_id << (4*i); + gator_events_ccn504_set_dt_config(node_id/2, i, (node_id & 1) == 0 ? 0x8 : 0xC); + break; + } + //printk(KERN_ERR "%s(%s:%i) writel %x %x\n", __FUNCTION__, __FILE__, __LINE__, pmu_event_sel, region*REGION_SIZE + PMU_EVENT_SEL); + writel(pmu_event_sel, gator_events_ccn504_base + region*REGION_SIZE + PMU_EVENT_SEL); + } + + return 0; +} + +static void gator_events_ccn504_stop(void) +{ + int i; + + // cycle counter does not need to be disabled + for (i = 0; i < CCNT; ++i) { + int node_type; + int region; + + node_type = get_node_type(gator_events_ccn504_event[i]); + region = get_region(gator_events_ccn504_event[i]); + + //printk(KERN_ERR "%s(%s:%i) writel %x %x\n", __FUNCTION__, __FILE__, __LINE__, 0, region*REGION_SIZE + PMU_EVENT_SEL); + writel(0, gator_events_ccn504_base + region*REGION_SIZE + PMU_EVENT_SEL); + } + + // Clear dt_config + for (i = 0; i < 11; ++i) { + //printk(KERN_ERR "%s(%s:%i) writel %x %x\n", __FUNCTION__, __FILE__, __LINE__, 0, (REGION_XP + i)*REGION_SIZE + DT_CONFIG); + writel(0, gator_events_ccn504_base + (REGION_XP + i)*REGION_SIZE + DT_CONFIG); + } +} + +static int gator_events_ccn504_read(int **buffer) +{ + int i; + int len = 0; + + if (!on_primary_core()) { + return 0; + } + + // Verify the pmsr register is zero + //i = 0; + while (readl(gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + PMSR) != 0) { + //++i; + } + //printk(KERN_ERR "%s(%s:%i) %i\n", __FUNCTION__, __FILE__, __LINE__, i); + + // Request a PMU snapshot + writel(1, gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + PMSR_REQ); + + // Wait for the snapshot + //i = 0; + while (readl(gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + PMSR) == 0) { + //++i; + } + //printk(KERN_ERR "%s(%s:%i) %i\n", __FUNCTION__, __FILE__, __LINE__, i); + + // Read the shadow registers + for (i = 0; i < CNTMAX; ++i) { + if (!gator_events_ccn504_enabled[i]) { + continue; + } + + gator_events_ccn504_buffer[len++] = gator_events_ccn504_key[i]; + gator_events_ccn504_buffer[len++] = readl(gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + (i == CCNT ? PMCCNTRSR : PMEVCNTSR0 + 8*i)); + + // Are the counters registers cleared when read? Is that what the cntr_rst bit on the pmcr register does? + } + + // Clear the PMU snapshot status + writel(1, gator_events_ccn504_base + REGION_DEBUG*REGION_SIZE + PMSR_CLR); + + return len; +} + +static void __maybe_unused gator_events_ccn504_enumerate(int pos, int size) +{ + int i; + u32 oly_id; + + for (i = pos; i < pos + size; ++i) { + oly_id = readl(gator_events_ccn504_base + i*REGION_SIZE + OLY_ID); + printk(KERN_ERR "%s(%s:%i) %i %08x\n", __FUNCTION__, __FILE__, __LINE__, i, oly_id); + } +} + +static struct gator_interface gator_events_ccn504_interface = { + .shutdown = gator_events_ccn504_create_shutdown, + .create_files = gator_events_ccn504_create_files, + .start = gator_events_ccn504_start, + .stop = gator_events_ccn504_stop, + .read = gator_events_ccn504_read, +}; + +int gator_events_ccn504_init(void) +{ + int i; + + if (ccn504_addr == 0) { + return -1; + } + + gator_events_ccn504_base = ioremap(ccn504_addr, NUM_REGIONS*REGION_SIZE); + if (gator_events_ccn504_base == NULL) { + printk(KERN_ERR "%s(%s:%i) ioremap returned NULL\n", __FUNCTION__, __FILE__, __LINE__); + return -1; + } + //printk(KERN_ERR "%s(%s:%i)\n", __FUNCTION__, __FILE__, __LINE__); + + // Test - can memory be read + { + //gator_events_ccn504_enumerate(0, NUM_REGIONS); + +#if 0 + // DT + gator_events_ccn504_enumerate(1, 1); + // HN-F + gator_events_ccn504_enumerate(32, 8); + // XP + gator_events_ccn504_enumerate(64, 11); + // RN-I + gator_events_ccn504_enumerate(128, 1); + gator_events_ccn504_enumerate(130, 1); + gator_events_ccn504_enumerate(134, 1); + gator_events_ccn504_enumerate(140, 1); + gator_events_ccn504_enumerate(144, 1); + gator_events_ccn504_enumerate(148, 1); + // SBAS + gator_events_ccn504_enumerate(129, 1); + gator_events_ccn504_enumerate(137, 1); + gator_events_ccn504_enumerate(139, 1); + gator_events_ccn504_enumerate(147, 1); +#endif + } + + for (i = 0; i < CNTMAX; ++i) { + gator_events_ccn504_enabled[i] = 0; + gator_events_ccn504_event[i] = 0; + gator_events_ccn504_key[i] = gator_events_get_key(); + } + + return gator_events_install(&gator_events_ccn504_interface); +} + +gator_events_init(gator_events_ccn504_init); |