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