Release 4.7 drivers/hwtracing/intel_th/sth.c
/*
* Intel(R) Trace Hub Software Trace Hub support
*
* Copyright (C) 2014-2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/stm.h>
#include "intel_th.h"
#include "sth.h"
struct sth_device {
void __iomem *base;
void __iomem *channels;
phys_addr_t channels_phys;
struct device *dev;
struct stm_data stm;
unsigned int sw_nmasters;
};
static struct intel_th_channel __iomem *
sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel)
{
struct intel_th_channel __iomem *sw_map = sth->channels;
return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels +
channel];
}
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static void sth_iowrite(void __iomem *dest, const unsigned char *payload,
unsigned int size)
{
switch (size) {
#ifdef CONFIG_64BIT
case 8:
writeq_relaxed(*(u64 *)payload, dest);
break;
#endif
case 4:
writel_relaxed(*(u32 *)payload, dest);
break;
case 2:
writew_relaxed(*(u16 *)payload, dest);
break;
case 1:
writeb_relaxed(*(u8 *)payload, dest);
break;
default:
break;
}
}
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static ssize_t sth_stm_packet(struct stm_data *stm_data, unsigned int master,
unsigned int channel, unsigned int packet,
unsigned int flags, unsigned int size,
const unsigned char *payload)
{
struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
struct intel_th_channel __iomem *out =
sth_channel(sth, master, channel);
u64 __iomem *outp = &out->Dn;
unsigned long reg = REG_STH_TRIG;
#ifndef CONFIG_64BIT
if (size > 4)
size = 4;
#endif
size = rounddown_pow_of_two(size);
switch (packet) {
/* Global packets (GERR, XSYNC, TRIG) are sent with register writes */
case STP_PACKET_GERR:
reg += 4;
case STP_PACKET_XSYNC:
reg += 8;
case STP_PACKET_TRIG:
if (flags & STP_PACKET_TIMESTAMPED)
reg += 4;
writeb_relaxed(*payload, sth->base + reg);
break;
case STP_PACKET_MERR:
if (size > 4)
size = 4;
sth_iowrite(&out->MERR, payload, size);
break;
case STP_PACKET_FLAG:
if (flags & STP_PACKET_TIMESTAMPED)
outp = (u64 __iomem *)&out->FLAG_TS;
else
outp = (u64 __iomem *)&out->FLAG;
size = 0;
writeb_relaxed(0, outp);
break;
case STP_PACKET_USER:
if (flags & STP_PACKET_TIMESTAMPED)
outp = &out->USER_TS;
else
outp = &out->USER;
sth_iowrite(outp, payload, size);
break;
case STP_PACKET_DATA:
outp = &out->Dn;
if (flags & STP_PACKET_TIMESTAMPED)
outp += 2;
if (flags & STP_PACKET_MARKED)
outp++;
sth_iowrite(outp, payload, size);
break;
default:
return -ENOTSUPP;
}
return size;
}
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static phys_addr_t
sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
unsigned int channel, unsigned int nr_chans)
{
struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
phys_addr_t addr;
master -= sth->stm.sw_start;
addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) *
sizeof(struct intel_th_channel);
if (offset_in_page(addr) ||
offset_in_page(nr_chans * sizeof(struct intel_th_channel)))
return 0;
return addr;
}
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static int sth_stm_link(struct stm_data *stm_data, unsigned int master,
unsigned int channel)
{
struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
intel_th_set_output(to_intel_th_device(sth->dev), master);
return 0;
}
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static int intel_th_sw_init(struct sth_device *sth)
{
u32 reg;
reg = ioread32(sth->base + REG_STH_STHCAP1);
sth->stm.sw_nchannels = reg & 0xff;
reg = ioread32(sth->base + REG_STH_STHCAP0);
sth->stm.sw_start = reg & 0xffff;
sth->stm.sw_end = reg >> 16;
sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start;
dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n",
sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters,
sth->stm.sw_nchannels);
return 0;
}
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static int intel_th_sth_probe(struct intel_th_device *thdev)
{
struct device *dev = &thdev->dev;
struct sth_device *sth;
struct resource *res;
void __iomem *base, *channels;
int err;
res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
base = devm_ioremap(dev, res->start, resource_size(res));
if (!base)
return -ENOMEM;
res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1);
if (!res)
return -ENODEV;
channels = devm_ioremap(dev, res->start, resource_size(res));
if (!channels)
return -ENOMEM;
sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL);
if (!sth)
return -ENOMEM;
sth->dev = dev;
sth->base = base;
sth->channels = channels;
sth->channels_phys = res->start;
sth->stm.name = dev_name(dev);
sth->stm.packet = sth_stm_packet;
sth->stm.mmio_addr = sth_stm_mmio_addr;
sth->stm.sw_mmiosz = sizeof(struct intel_th_channel);
sth->stm.link = sth_stm_link;
err = intel_th_sw_init(sth);
if (err)
return err;
err = stm_register_device(dev, &sth->stm, THIS_MODULE);
if (err) {
dev_err(dev, "stm_register_device failed\n");
return err;
}
dev_set_drvdata(dev, sth);
return 0;
}
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static void intel_th_sth_remove(struct intel_th_device *thdev)
{
struct sth_device *sth = dev_get_drvdata(&thdev->dev);
stm_unregister_device(&sth->stm);
}
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static struct intel_th_driver intel_th_sth_driver = {
.probe = intel_th_sth_probe,
.remove = intel_th_sth_remove,
.driver = {
.name = "sth",
.owner = THIS_MODULE,
},
};
module_driver(intel_th_sth_driver,
intel_th_driver_register,
intel_th_driver_unregister);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver");
MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");
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