346 lines
7.1 KiB
C
346 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel(R) Trace Hub PTI output driver
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*
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* Copyright (C) 2014-2016 Intel Corporation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/sizes.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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#include "intel_th.h"
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#include "pti.h"
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struct pti_device {
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void __iomem *base;
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struct intel_th_device *thdev;
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unsigned int mode;
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unsigned int freeclk;
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unsigned int clkdiv;
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unsigned int patgen;
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unsigned int lpp_dest_mask;
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unsigned int lpp_dest;
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};
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/* map PTI widths to MODE settings of PTI_CTL register */
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static const unsigned int pti_mode[] = {
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0, 4, 8, 0, 12, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0,
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};
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static int pti_width_mode(unsigned int width)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pti_mode); i++)
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if (pti_mode[i] == width)
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return i;
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return -EINVAL;
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}
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static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%d\n", pti_mode[pti->mode]);
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}
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static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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ret = pti_width_mode(val);
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if (ret < 0)
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return ret;
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pti->mode = ret;
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return size;
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}
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static DEVICE_ATTR_RW(mode);
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static ssize_t
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freerunning_clock_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%d\n", pti->freeclk);
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}
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static ssize_t
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freerunning_clock_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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pti->freeclk = !!val;
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return size;
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}
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static DEVICE_ATTR_RW(freerunning_clock);
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static ssize_t
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clock_divider_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%d\n", 1u << pti->clkdiv);
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}
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static ssize_t
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clock_divider_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (!is_power_of_2(val) || val > 8 || !val)
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return -EINVAL;
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pti->clkdiv = val;
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return size;
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}
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static DEVICE_ATTR_RW(clock_divider);
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static struct attribute *pti_output_attrs[] = {
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&dev_attr_mode.attr,
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&dev_attr_freerunning_clock.attr,
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&dev_attr_clock_divider.attr,
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NULL,
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};
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static struct attribute_group pti_output_group = {
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.attrs = pti_output_attrs,
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};
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static int intel_th_pti_activate(struct intel_th_device *thdev)
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{
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struct pti_device *pti = dev_get_drvdata(&thdev->dev);
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u32 ctl = PTI_EN;
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if (pti->patgen)
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ctl |= pti->patgen << __ffs(PTI_PATGENMODE);
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if (pti->freeclk)
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ctl |= PTI_FCEN;
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ctl |= pti->mode << __ffs(PTI_MODE);
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ctl |= pti->clkdiv << __ffs(PTI_CLKDIV);
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ctl |= pti->lpp_dest << __ffs(LPP_DEST);
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iowrite32(ctl, pti->base + REG_PTI_CTL);
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intel_th_trace_enable(thdev);
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return 0;
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}
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static void intel_th_pti_deactivate(struct intel_th_device *thdev)
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{
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struct pti_device *pti = dev_get_drvdata(&thdev->dev);
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intel_th_trace_disable(thdev);
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iowrite32(0, pti->base + REG_PTI_CTL);
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}
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static void read_hw_config(struct pti_device *pti)
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{
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u32 ctl = ioread32(pti->base + REG_PTI_CTL);
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pti->mode = (ctl & PTI_MODE) >> __ffs(PTI_MODE);
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pti->clkdiv = (ctl & PTI_CLKDIV) >> __ffs(PTI_CLKDIV);
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pti->freeclk = !!(ctl & PTI_FCEN);
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if (!pti_mode[pti->mode])
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pti->mode = pti_width_mode(4);
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if (!pti->clkdiv)
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pti->clkdiv = 1;
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if (pti->thdev->output.type == GTH_LPP) {
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if (ctl & LPP_PTIPRESENT)
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pti->lpp_dest_mask |= LPP_DEST_PTI;
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if (ctl & LPP_BSSBPRESENT)
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pti->lpp_dest_mask |= LPP_DEST_EXI;
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if (ctl & LPP_DEST)
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pti->lpp_dest = 1;
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}
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}
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static int intel_th_pti_probe(struct intel_th_device *thdev)
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{
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struct device *dev = &thdev->dev;
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struct resource *res;
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struct pti_device *pti;
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void __iomem *base;
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res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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base = devm_ioremap(dev, res->start, resource_size(res));
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if (!base)
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return -ENOMEM;
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pti = devm_kzalloc(dev, sizeof(*pti), GFP_KERNEL);
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if (!pti)
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return -ENOMEM;
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pti->thdev = thdev;
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pti->base = base;
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read_hw_config(pti);
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dev_set_drvdata(dev, pti);
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return 0;
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}
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static void intel_th_pti_remove(struct intel_th_device *thdev)
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{
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}
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static struct intel_th_driver intel_th_pti_driver = {
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.probe = intel_th_pti_probe,
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.remove = intel_th_pti_remove,
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.activate = intel_th_pti_activate,
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.deactivate = intel_th_pti_deactivate,
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.attr_group = &pti_output_group,
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.driver = {
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.name = "pti",
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.owner = THIS_MODULE,
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},
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};
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static const char * const lpp_dest_str[] = { "pti", "exi" };
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static ssize_t lpp_dest_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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ssize_t ret = 0;
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int i;
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for (i = ARRAY_SIZE(lpp_dest_str) - 1; i >= 0; i--) {
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const char *fmt = pti->lpp_dest == i ? "[%s] " : "%s ";
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if (!(pti->lpp_dest_mask & BIT(i)))
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continue;
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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fmt, lpp_dest_str[i]);
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}
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if (ret)
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buf[ret - 1] = '\n';
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return ret;
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}
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static ssize_t lpp_dest_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct pti_device *pti = dev_get_drvdata(dev);
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ssize_t ret = -EINVAL;
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int i;
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for (i = 0; i < ARRAY_SIZE(lpp_dest_str); i++)
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if (sysfs_streq(buf, lpp_dest_str[i]))
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break;
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if (i < ARRAY_SIZE(lpp_dest_str) && pti->lpp_dest_mask & BIT(i)) {
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pti->lpp_dest = i;
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ret = size;
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}
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return ret;
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}
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static DEVICE_ATTR_RW(lpp_dest);
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static struct attribute *lpp_output_attrs[] = {
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&dev_attr_mode.attr,
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&dev_attr_freerunning_clock.attr,
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&dev_attr_clock_divider.attr,
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&dev_attr_lpp_dest.attr,
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NULL,
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};
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static struct attribute_group lpp_output_group = {
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.attrs = lpp_output_attrs,
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};
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static struct intel_th_driver intel_th_lpp_driver = {
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.probe = intel_th_pti_probe,
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.remove = intel_th_pti_remove,
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.activate = intel_th_pti_activate,
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.deactivate = intel_th_pti_deactivate,
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.attr_group = &lpp_output_group,
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.driver = {
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.name = "lpp",
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.owner = THIS_MODULE,
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},
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};
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static int __init intel_th_pti_lpp_init(void)
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{
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int err;
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err = intel_th_driver_register(&intel_th_pti_driver);
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if (err)
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return err;
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err = intel_th_driver_register(&intel_th_lpp_driver);
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if (err) {
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intel_th_driver_unregister(&intel_th_pti_driver);
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return err;
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}
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return 0;
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}
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module_init(intel_th_pti_lpp_init);
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static void __exit intel_th_pti_lpp_exit(void)
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{
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intel_th_driver_unregister(&intel_th_pti_driver);
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intel_th_driver_unregister(&intel_th_lpp_driver);
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}
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module_exit(intel_th_pti_lpp_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel(R) Trace Hub PTI/LPP output driver");
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MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
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