342 lines
8.0 KiB
C
342 lines
8.0 KiB
C
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/clk.h>
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#include <linux/of_coresight.h>
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#include <linux/coresight.h>
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#include <linux/of.h>
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#include "coresight-priv.h"
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struct hwevent_mux {
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phys_addr_t start;
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phys_addr_t end;
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};
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struct hwevent_drvdata {
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struct device *dev;
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struct coresight_device *csdev;
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struct clk *clk;
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struct mutex mutex;
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int nr_hclk;
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struct clk **hclk;
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int nr_hmux;
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struct hwevent_mux *hmux;
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bool enable;
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};
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static int hwevent_enable(struct hwevent_drvdata *drvdata)
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{
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int ret, i;
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mutex_lock(&drvdata->mutex);
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if (drvdata->enable)
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goto out;
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ret = clk_prepare_enable(drvdata->clk);
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if (ret)
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goto err0;
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for (i = 0; i < drvdata->nr_hclk; i++) {
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ret = clk_prepare_enable(drvdata->hclk[i]);
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if (ret)
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goto err1;
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}
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drvdata->enable = true;
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dev_info(drvdata->dev, "Hardware Event driver enabled\n");
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out:
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mutex_unlock(&drvdata->mutex);
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return 0;
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err1:
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clk_disable_unprepare(drvdata->clk);
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for (i--; i >= 0; i--)
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clk_disable_unprepare(drvdata->hclk[i]);
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err0:
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mutex_unlock(&drvdata->mutex);
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return ret;
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}
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static void hwevent_disable(struct hwevent_drvdata *drvdata)
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{
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int i;
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mutex_lock(&drvdata->mutex);
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if (!drvdata->enable)
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goto out;
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drvdata->enable = false;
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clk_disable_unprepare(drvdata->clk);
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for (i = 0; i < drvdata->nr_hclk; i++)
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clk_disable_unprepare(drvdata->hclk[i]);
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dev_info(drvdata->dev, "Hardware Event driver disabled\n");
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out:
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mutex_unlock(&drvdata->mutex);
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}
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static ssize_t hwevent_show_enable(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
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unsigned long val = drvdata->enable;
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return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
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}
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static ssize_t hwevent_store_enable(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
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unsigned long val;
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int ret = 0;
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if (sscanf(buf, "%lx", &val) != 1)
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return -EINVAL;
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if (val)
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ret = hwevent_enable(drvdata);
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else
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hwevent_disable(drvdata);
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if (ret)
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return ret;
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return size;
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}
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static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, hwevent_show_enable,
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hwevent_store_enable);
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static ssize_t hwevent_store_setreg(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
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void *hwereg;
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phys_addr_t addr;
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uint32_t val;
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int ret, i;
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if (sscanf(buf, "%x %x", &addr, &val) != 2)
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return -EINVAL;
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mutex_lock(&drvdata->mutex);
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if (!drvdata->enable) {
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dev_err(dev, "Hardware Event driver not enabled\n");
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ret = -EINVAL;
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goto err;
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}
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for (i = 0; i < drvdata->nr_hmux; i++) {
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if ((addr >= drvdata->hmux[i].start) &&
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(addr < drvdata->hmux[i].end)) {
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hwereg = devm_ioremap(dev,
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drvdata->hmux[i].start,
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drvdata->hmux[i].end -
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drvdata->hmux[i].start);
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if (!hwereg) {
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dev_err(dev, "unable to map address 0x%x\n",
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addr);
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ret = -ENOMEM;
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goto err;
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}
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writel_relaxed(val, hwereg + addr -
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drvdata->hmux[i].start);
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/* Ensure writes to hwevent control registers
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are completed before unmapping the address
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*/
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mb();
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devm_iounmap(dev, hwereg);
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break;
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}
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}
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if (i == drvdata->nr_hmux) {
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ret = coresight_csr_hwctrl_set(addr, val);
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if (ret) {
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dev_err(dev, "invalid mux control register address\n");
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ret = -EINVAL;
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goto err;
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}
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}
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mutex_unlock(&drvdata->mutex);
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return size;
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err:
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mutex_unlock(&drvdata->mutex);
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return ret;
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}
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static DEVICE_ATTR(setreg, S_IWUSR, NULL, hwevent_store_setreg);
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static struct attribute *hwevent_attrs[] = {
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&dev_attr_enable.attr,
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&dev_attr_setreg.attr,
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NULL,
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};
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static struct attribute_group hwevent_attr_grp = {
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.attrs = hwevent_attrs,
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};
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static const struct attribute_group *hwevent_attr_grps[] = {
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&hwevent_attr_grp,
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NULL,
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};
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static int __devinit hwevent_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct hwevent_drvdata *drvdata;
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struct coresight_desc *desc;
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struct coresight_platform_data *pdata;
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struct resource *res;
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int ret, i;
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const char *hmux_name, *hclk_name;
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if (pdev->dev.of_node) {
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pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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pdev->dev.platform_data = pdata;
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}
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->dev = &pdev->dev;
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platform_set_drvdata(pdev, drvdata);
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if (pdev->dev.of_node)
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drvdata->nr_hmux = of_property_count_strings(pdev->dev.of_node,
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"reg-names");
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if (drvdata->nr_hmux > 0) {
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drvdata->hmux = devm_kzalloc(dev, drvdata->nr_hmux *
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sizeof(*drvdata->hmux),
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GFP_KERNEL);
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if (!drvdata->hmux)
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return -ENOMEM;
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for (i = 0; i < drvdata->nr_hmux; i++) {
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ret = of_property_read_string_index(pdev->dev.of_node,
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"reg-names", i,
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&hmux_name);
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if (ret)
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return ret;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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hmux_name);
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if (!res)
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return -ENODEV;
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drvdata->hmux[i].start = res->start;
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drvdata->hmux[i].end = res->end;
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}
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} else if (drvdata->nr_hmux < 0) {
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return drvdata->nr_hmux;
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} else {
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/* return error if reg-names in dt node is empty string */
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return -ENODEV;
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}
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mutex_init(&drvdata->mutex);
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drvdata->clk = devm_clk_get(dev, "core_clk");
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if (IS_ERR(drvdata->clk))
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return PTR_ERR(drvdata->clk);
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ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
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if (ret)
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return ret;
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if (pdev->dev.of_node)
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drvdata->nr_hclk = of_property_count_strings(pdev->dev.of_node,
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"qcom,hwevent-clks");
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if (drvdata->nr_hclk > 0) {
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drvdata->hclk = devm_kzalloc(dev, drvdata->nr_hclk *
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sizeof(*drvdata->hclk),
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GFP_KERNEL);
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if (!drvdata->hclk)
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return -ENOMEM;
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for (i = 0; i < drvdata->nr_hclk; i++) {
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ret = of_property_read_string_index(pdev->dev.of_node,
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"qcom,hwevent-clks",
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i, &hclk_name);
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if (ret)
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return ret;
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drvdata->hclk[i] = devm_clk_get(dev, hclk_name);
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if (IS_ERR(drvdata->hclk[i]))
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return PTR_ERR(drvdata->hclk[i]);
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}
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}
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desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return -ENOMEM;
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desc->type = CORESIGHT_DEV_TYPE_NONE;
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desc->pdata = pdev->dev.platform_data;
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desc->dev = &pdev->dev;
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desc->groups = hwevent_attr_grps;
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desc->owner = THIS_MODULE;
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drvdata->csdev = coresight_register(desc);
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if (IS_ERR(drvdata->csdev))
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return PTR_ERR(drvdata->csdev);
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dev_info(dev, "Hardware Event driver initialized\n");
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return 0;
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}
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static int __devexit hwevent_remove(struct platform_device *pdev)
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{
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struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static struct of_device_id hwevent_match[] = {
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{.compatible = "qcom,coresight-hwevent"},
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{}
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};
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static struct platform_driver hwevent_driver = {
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.probe = hwevent_probe,
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.remove = __devexit_p(hwevent_remove),
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.driver = {
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.name = "coresight-hwevent",
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.owner = THIS_MODULE,
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.of_match_table = hwevent_match,
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},
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};
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static int __init hwevent_init(void)
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{
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return platform_driver_register(&hwevent_driver);
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}
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module_init(hwevent_init);
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static void __exit hwevent_exit(void)
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{
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platform_driver_unregister(&hwevent_driver);
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}
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module_exit(hwevent_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("CoreSight Hardware Event driver");
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