fdc522c90f
Add snapshot for coresight hwevent driver from msm-4.19 commit 64be469bda3ae ("power: smb1390-psy: Configure IREV and main's ICL to prevent IREV condition"). Make necessary change to adopt coresight framework change. Change-Id: I3f0d9259d4d0f5dd12d76b7fbdde92fcb681f4b6 Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
351 lines
7.8 KiB
C
351 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013-2017, 2019, The Linux Foundation. All rights reserved.
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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/coresight.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.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_hreg;
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struct regulator **hreg;
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int nr_hmux;
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struct hwevent_mux *hmux;
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struct coresight_csr *csr;
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const char *csr_name;
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};
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DEFINE_CORESIGHT_DEVLIST(hwevent_devs, "hwevent");
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static int hwevent_enable(struct hwevent_drvdata *drvdata)
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{
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int ret, i, j;
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ret = clk_prepare_enable(drvdata->clk);
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if (ret)
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return ret;
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for (i = 0; i < drvdata->nr_hreg; i++) {
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ret = regulator_enable(drvdata->hreg[i]);
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if (ret)
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goto err0;
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}
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for (j = 0; j < drvdata->nr_hclk; j++) {
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ret = clk_prepare_enable(drvdata->hclk[j]);
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if (ret)
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goto err1;
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}
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return 0;
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err1:
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for (j--; j >= 0; j--)
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clk_disable_unprepare(drvdata->hclk[j]);
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err0:
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for (i--; i >= 0; i--)
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regulator_disable(drvdata->hreg[i]);
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clk_disable_unprepare(drvdata->clk);
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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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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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for (i = 0; i < drvdata->nr_hreg; i++)
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regulator_disable(drvdata->hreg[i]);
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}
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static ssize_t setreg_store(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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unsigned long long addr;
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unsigned long val;
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int ret, i;
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if (sscanf(buf, "%llx %lx", &addr, &val) != 2)
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return -EINVAL;
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mutex_lock(&drvdata->mutex);
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ret = hwevent_enable(drvdata);
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if (ret) {
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mutex_unlock(&drvdata->mutex);
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return ret;
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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 = ioremap(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%llx\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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/*
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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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iounmap(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(drvdata->csr, 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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hwevent_disable(drvdata);
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mutex_unlock(&drvdata->mutex);
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return size;
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err:
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hwevent_disable(drvdata);
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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_WO(setreg);
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static struct attribute *hwevent_attrs[] = {
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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 hwevent_init_hmux(struct hwevent_drvdata *drvdata,
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struct platform_device *pdev)
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{
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int ret, i;
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struct resource *res;
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const char *hmux_name;
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struct device_node *node = drvdata->dev->of_node;
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drvdata->nr_hmux = of_property_count_strings(node,
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"reg-names");
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if (drvdata->nr_hmux < 0)
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drvdata->nr_hmux = 0;
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if (drvdata->nr_hmux > 0) {
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drvdata->hmux = devm_kzalloc(drvdata->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(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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}
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return 0;
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}
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static int hwevent_init_clk(struct hwevent_drvdata *drvdata)
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{
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int ret, i;
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const char *hclk_name, *hreg_name;
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struct device_node *node = drvdata->dev->of_node;
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drvdata->nr_hclk = of_property_count_strings(node,
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"qcom,hwevent-clks");
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drvdata->nr_hreg = of_property_count_strings(node,
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"qcom,hwevent-regs");
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if (drvdata->nr_hclk > 0) {
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drvdata->hclk = devm_kzalloc(drvdata->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(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(drvdata->dev,
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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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if (drvdata->nr_hreg > 0) {
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drvdata->hreg = devm_kzalloc(drvdata->dev, drvdata->nr_hreg *
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sizeof(*drvdata->hreg),
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GFP_KERNEL);
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if (!drvdata->hreg)
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return -ENOMEM;
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for (i = 0; i < drvdata->nr_hreg; i++) {
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ret = of_property_read_string_index(node,
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"qcom,hwevent-regs",
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i, &hreg_name);
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if (ret)
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return ret;
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drvdata->hreg[i] = devm_regulator_get(drvdata->dev,
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hreg_name);
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if (IS_ERR(drvdata->hreg[i]))
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return PTR_ERR(drvdata->hreg[i]);
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}
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}
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return 0;
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}
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static int 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 = { 0 };
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struct coresight_platform_data *pdata;
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int ret;
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desc.name = coresight_alloc_device_name(&hwevent_devs, dev);
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if (!desc.name)
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return -ENOMEM;
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pdata = coresight_get_platform_data(dev);
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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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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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mutex_init(&drvdata->mutex);
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ret = of_get_coresight_csr_name(dev->of_node, &drvdata->csr_name);
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if (ret)
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dev_err(dev, "No csr data\n");
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else {
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drvdata->csr = coresight_csr_get(drvdata->csr_name);
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if (IS_ERR(drvdata->csr)) {
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dev_dbg(dev, "failed to get csr, defer probe\n");
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return -EPROBE_DEFER;
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}
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}
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drvdata->clk = devm_clk_get(dev, "apb_pclk");
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if (IS_ERR(drvdata->clk))
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return PTR_ERR(drvdata->clk);
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ret = hwevent_init_hmux(drvdata, pdev);
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if (ret)
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return ret;
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ret = hwevent_init_clk(drvdata);
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if (ret)
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return ret;
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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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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_dbg(dev, "Hardware Event driver initialized\n");
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return 0;
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}
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static int 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 const 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 = hwevent_remove,
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.driver = {
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.name = "coresight-hwevent",
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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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