375 lines
8.6 KiB
C
375 lines
8.6 KiB
C
/*
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* exynos_ppmu.c - EXYNOS PPMU (Platform Performance Monitoring Unit) support
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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* Author : Chanwoo Choi <cw00.choi@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/suspend.h>
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#include <linux/devfreq-event.h>
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#include "exynos-ppmu.h"
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struct exynos_ppmu_data {
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void __iomem *base;
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struct clk *clk;
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};
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struct exynos_ppmu {
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struct devfreq_event_dev **edev;
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struct devfreq_event_desc *desc;
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unsigned int num_events;
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struct device *dev;
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struct mutex lock;
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struct exynos_ppmu_data ppmu;
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};
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#define PPMU_EVENT(name) \
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{ "ppmu-event0-"#name, PPMU_PMNCNT0 }, \
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{ "ppmu-event1-"#name, PPMU_PMNCNT1 }, \
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{ "ppmu-event2-"#name, PPMU_PMNCNT2 }, \
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{ "ppmu-event3-"#name, PPMU_PMNCNT3 }
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struct __exynos_ppmu_events {
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char *name;
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int id;
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} ppmu_events[] = {
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/* For Exynos3250, Exynos4 and Exynos5260 */
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PPMU_EVENT(g3d),
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PPMU_EVENT(fsys),
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/* For Exynos4 SoCs and Exynos3250 */
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PPMU_EVENT(dmc0),
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PPMU_EVENT(dmc1),
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PPMU_EVENT(cpu),
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PPMU_EVENT(rightbus),
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PPMU_EVENT(leftbus),
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PPMU_EVENT(lcd0),
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PPMU_EVENT(camif),
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/* Only for Exynos3250 and Exynos5260 */
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PPMU_EVENT(mfc),
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/* Only for Exynos4 SoCs */
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PPMU_EVENT(mfc-left),
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PPMU_EVENT(mfc-right),
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/* Only for Exynos5260 SoCs */
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PPMU_EVENT(drex0-s0),
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PPMU_EVENT(drex0-s1),
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PPMU_EVENT(drex1-s0),
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PPMU_EVENT(drex1-s1),
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PPMU_EVENT(eagle),
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PPMU_EVENT(kfc),
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PPMU_EVENT(isp),
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PPMU_EVENT(fimc),
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PPMU_EVENT(gscl),
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PPMU_EVENT(mscl),
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PPMU_EVENT(fimd0x),
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PPMU_EVENT(fimd1x),
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{ /* sentinel */ },
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};
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static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
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if (!strcmp(edev->desc->name, ppmu_events[i].name))
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return ppmu_events[i].id;
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return -EINVAL;
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}
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static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
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{
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struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
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u32 pmnc;
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/* Disable all counters */
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__raw_writel(PPMU_CCNT_MASK |
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PPMU_PMCNT0_MASK |
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PPMU_PMCNT1_MASK |
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PPMU_PMCNT2_MASK |
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PPMU_PMCNT3_MASK,
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info->ppmu.base + PPMU_CNTENC);
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/* Disable PPMU */
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pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
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pmnc &= ~PPMU_PMNC_ENABLE_MASK;
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__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
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return 0;
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}
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static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
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{
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struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
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int id = exynos_ppmu_find_ppmu_id(edev);
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u32 pmnc, cntens;
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if (id < 0)
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return id;
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/* Enable specific counter */
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cntens = __raw_readl(info->ppmu.base + PPMU_CNTENS);
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cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
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__raw_writel(cntens, info->ppmu.base + PPMU_CNTENS);
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/* Set the event of Read/Write data count */
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__raw_writel(PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT,
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info->ppmu.base + PPMU_BEVTxSEL(id));
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/* Reset cycle counter/performance counter and enable PPMU */
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pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
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pmnc &= ~(PPMU_PMNC_ENABLE_MASK
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| PPMU_PMNC_COUNTER_RESET_MASK
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| PPMU_PMNC_CC_RESET_MASK);
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pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
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pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
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pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
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__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
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return 0;
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}
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static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
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struct devfreq_event_data *edata)
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{
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struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
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int id = exynos_ppmu_find_ppmu_id(edev);
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u32 pmnc, cntenc;
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if (id < 0)
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return -EINVAL;
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/* Disable PPMU */
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pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
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pmnc &= ~PPMU_PMNC_ENABLE_MASK;
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__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
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/* Read cycle count */
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edata->total_count = __raw_readl(info->ppmu.base + PPMU_CCNT);
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/* Read performance count */
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switch (id) {
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case PPMU_PMNCNT0:
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case PPMU_PMNCNT1:
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case PPMU_PMNCNT2:
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edata->load_count
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= __raw_readl(info->ppmu.base + PPMU_PMNCT(id));
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break;
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case PPMU_PMNCNT3:
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edata->load_count =
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((__raw_readl(info->ppmu.base + PPMU_PMCNT3_HIGH) << 8)
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| __raw_readl(info->ppmu.base + PPMU_PMCNT3_LOW));
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break;
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default:
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return -EINVAL;
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}
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/* Disable specific counter */
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cntenc = __raw_readl(info->ppmu.base + PPMU_CNTENC);
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cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
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__raw_writel(cntenc, info->ppmu.base + PPMU_CNTENC);
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dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
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edata->load_count, edata->total_count);
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return 0;
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}
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static const struct devfreq_event_ops exynos_ppmu_ops = {
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.disable = exynos_ppmu_disable,
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.set_event = exynos_ppmu_set_event,
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.get_event = exynos_ppmu_get_event,
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};
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static int of_get_devfreq_events(struct device_node *np,
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struct exynos_ppmu *info)
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{
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struct devfreq_event_desc *desc;
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struct device *dev = info->dev;
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struct device_node *events_np, *node;
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int i, j, count;
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events_np = of_get_child_by_name(np, "events");
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if (!events_np) {
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dev_err(dev,
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"failed to get child node of devfreq-event devices\n");
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return -EINVAL;
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}
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count = of_get_child_count(events_np);
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desc = devm_kzalloc(dev, sizeof(*desc) * count, GFP_KERNEL);
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if (!desc)
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return -ENOMEM;
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info->num_events = count;
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j = 0;
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for_each_child_of_node(events_np, node) {
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for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
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if (!ppmu_events[i].name)
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continue;
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if (!of_node_cmp(node->name, ppmu_events[i].name))
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break;
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}
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if (i == ARRAY_SIZE(ppmu_events)) {
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dev_warn(dev,
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"don't know how to configure events : %s\n",
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node->name);
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continue;
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}
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desc[j].ops = &exynos_ppmu_ops;
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desc[j].driver_data = info;
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of_property_read_string(node, "event-name", &desc[j].name);
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j++;
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of_node_put(node);
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}
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info->desc = desc;
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of_node_put(events_np);
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return 0;
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}
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static int exynos_ppmu_parse_dt(struct exynos_ppmu *info)
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{
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struct device *dev = info->dev;
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struct device_node *np = dev->of_node;
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int ret = 0;
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if (!np) {
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dev_err(dev, "failed to find devicetree node\n");
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return -EINVAL;
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}
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/* Maps the memory mapped IO to control PPMU register */
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info->ppmu.base = of_iomap(np, 0);
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if (IS_ERR_OR_NULL(info->ppmu.base)) {
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dev_err(dev, "failed to map memory region\n");
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return -ENOMEM;
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}
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info->ppmu.clk = devm_clk_get(dev, "ppmu");
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if (IS_ERR(info->ppmu.clk)) {
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info->ppmu.clk = NULL;
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dev_warn(dev, "cannot get PPMU clock\n");
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}
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ret = of_get_devfreq_events(np, info);
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if (ret < 0) {
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dev_err(dev, "failed to parse exynos ppmu dt node\n");
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goto err;
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}
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return 0;
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err:
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iounmap(info->ppmu.base);
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return ret;
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}
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static int exynos_ppmu_probe(struct platform_device *pdev)
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{
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struct exynos_ppmu *info;
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struct devfreq_event_dev **edev;
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struct devfreq_event_desc *desc;
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int i, ret = 0, size;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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mutex_init(&info->lock);
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info->dev = &pdev->dev;
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/* Parse dt data to get resource */
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ret = exynos_ppmu_parse_dt(info);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to parse devicetree for resource\n");
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return ret;
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}
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desc = info->desc;
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size = sizeof(struct devfreq_event_dev *) * info->num_events;
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info->edev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
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if (!info->edev) {
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dev_err(&pdev->dev,
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"failed to allocate memory devfreq-event devices\n");
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return -ENOMEM;
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}
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edev = info->edev;
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platform_set_drvdata(pdev, info);
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for (i = 0; i < info->num_events; i++) {
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edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
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if (IS_ERR(edev[i])) {
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ret = PTR_ERR(edev[i]);
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dev_err(&pdev->dev,
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"failed to add devfreq-event device\n");
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goto err;
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}
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}
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clk_prepare_enable(info->ppmu.clk);
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return 0;
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err:
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iounmap(info->ppmu.base);
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return ret;
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}
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static int exynos_ppmu_remove(struct platform_device *pdev)
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{
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struct exynos_ppmu *info = platform_get_drvdata(pdev);
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clk_disable_unprepare(info->ppmu.clk);
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iounmap(info->ppmu.base);
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return 0;
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}
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static struct of_device_id exynos_ppmu_id_match[] = {
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{ .compatible = "samsung,exynos-ppmu", },
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{ /* sentinel */ },
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};
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static struct platform_driver exynos_ppmu_driver = {
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.probe = exynos_ppmu_probe,
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.remove = exynos_ppmu_remove,
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.driver = {
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.name = "exynos-ppmu",
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.of_match_table = exynos_ppmu_id_match,
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},
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};
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module_platform_driver(exynos_ppmu_driver);
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MODULE_DESCRIPTION("Exynos PPMU(Platform Performance Monitoring Unit) driver");
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MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
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MODULE_LICENSE("GPL");
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