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alistair23-linux/drivers/hwtracing/coresight/coresight-tmc.c
Linus Walleij 32398ef6f4 coresight: tmc: let runtime PM handle core clock 
This uses runtime PM to manage the PCLK ("amba_pclk") instead
of screwing around with the framework by going in and taking
a copy from the amba device. The amba bus core will unprepare
and disable the clock when the device is unused when
CONFIG_PM is selected, else the clock will be always on.

Prior to this patch, as the AMBA primecell bus code enables
the PCLK, it would be left on after probe as
the clk_prepare_enable() and clk_disable_unprepare() was
called and thus just increase and decreas the refcount by
one, without it reaching zero and actually disabling the
clock. Now the runtime PM callbacks will make sure the PCLK
is properly disabled after probe.

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-05-24 11:12:08 -07:00

808 lines
20 KiB
C
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/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
#include "coresight-priv.h"
#define TMC_RSZ 0x004
#define TMC_STS 0x00c
#define TMC_RRD 0x010
#define TMC_RRP 0x014
#define TMC_RWP 0x018
#define TMC_TRG 0x01c
#define TMC_CTL 0x020
#define TMC_RWD 0x024
#define TMC_MODE 0x028
#define TMC_LBUFLEVEL 0x02c
#define TMC_CBUFLEVEL 0x030
#define TMC_BUFWM 0x034
#define TMC_RRPHI 0x038
#define TMC_RWPHI 0x03c
#define TMC_AXICTL 0x110
#define TMC_DBALO 0x118
#define TMC_DBAHI 0x11c
#define TMC_FFSR 0x300
#define TMC_FFCR 0x304
#define TMC_PSCR 0x308
#define TMC_ITMISCOP0 0xee0
#define TMC_ITTRFLIN 0xee8
#define TMC_ITATBDATA0 0xeec
#define TMC_ITATBCTR2 0xef0
#define TMC_ITATBCTR1 0xef4
#define TMC_ITATBCTR0 0xef8
/* register description */
/* TMC_CTL - 0x020 */
#define TMC_CTL_CAPT_EN BIT(0)
/* TMC_STS - 0x00C */
#define TMC_STS_TRIGGERED BIT(1)
/* TMC_AXICTL - 0x110 */
#define TMC_AXICTL_PROT_CTL_B0 BIT(0)
#define TMC_AXICTL_PROT_CTL_B1 BIT(1)
#define TMC_AXICTL_SCT_GAT_MODE BIT(7)
#define TMC_AXICTL_WR_BURST_LEN 0xF00
/* TMC_FFCR - 0x304 */
#define TMC_FFCR_EN_FMT BIT(0)
#define TMC_FFCR_EN_TI BIT(1)
#define TMC_FFCR_FON_FLIN BIT(4)
#define TMC_FFCR_FON_TRIG_EVT BIT(5)
#define TMC_FFCR_FLUSHMAN BIT(6)
#define TMC_FFCR_TRIGON_TRIGIN BIT(8)
#define TMC_FFCR_STOP_ON_FLUSH BIT(12)
#define TMC_STS_TRIGGERED_BIT 2
#define TMC_FFCR_FLUSHMAN_BIT 6
enum tmc_config_type {
TMC_CONFIG_TYPE_ETB,
TMC_CONFIG_TYPE_ETR,
TMC_CONFIG_TYPE_ETF,
};
enum tmc_mode {
TMC_MODE_CIRCULAR_BUFFER,
TMC_MODE_SOFTWARE_FIFO,
TMC_MODE_HARDWARE_FIFO,
};
enum tmc_mem_intf_width {
TMC_MEM_INTF_WIDTH_32BITS = 0x2,
TMC_MEM_INTF_WIDTH_64BITS = 0x3,
TMC_MEM_INTF_WIDTH_128BITS = 0x4,
TMC_MEM_INTF_WIDTH_256BITS = 0x5,
};
/**
* struct tmc_drvdata - specifics associated to an TMC component
* @base: memory mapped base address for this component.
* @dev: the device entity associated to this component.
* @csdev: component vitals needed by the framework.
* @miscdev: specifics to handle "/dev/xyz.tmc" entry.
* @spinlock: only one at a time pls.
* @read_count: manages preparation of buffer for reading.
* @buf: area of memory where trace data get sent.
* @paddr: DMA start location in RAM.
* @vaddr: virtual representation of @paddr.
* @size: @buf size.
* @enable: this TMC is being used.
* @config_type: TMC variant, must be of type @tmc_config_type.
* @trigger_cntr: amount of words to store after a trigger.
*/
struct tmc_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
struct miscdevice miscdev;
spinlock_t spinlock;
int read_count;
bool reading;
char *buf;
dma_addr_t paddr;
void __iomem *vaddr;
u32 size;
bool enable;
enum tmc_config_type config_type;
u32 trigger_cntr;
};
static void tmc_wait_for_ready(struct tmc_drvdata *drvdata)
{
/* Ensure formatter, unformatter and hardware fifo are empty */
if (coresight_timeout(drvdata->base,
TMC_STS, TMC_STS_TRIGGERED_BIT, 1)) {
dev_err(drvdata->dev,
"timeout observed when probing at offset %#x\n",
TMC_STS);
}
}
static void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
{
u32 ffcr;
ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
ffcr |= TMC_FFCR_STOP_ON_FLUSH;
writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
ffcr |= TMC_FFCR_FLUSHMAN;
writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
/* Ensure flush completes */
if (coresight_timeout(drvdata->base,
TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
dev_err(drvdata->dev,
"timeout observed when probing at offset %#x\n",
TMC_FFCR);
}
tmc_wait_for_ready(drvdata);
}
static void tmc_enable_hw(struct tmc_drvdata *drvdata)
{
writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
}
static void tmc_disable_hw(struct tmc_drvdata *drvdata)
{
writel_relaxed(0x0, drvdata->base + TMC_CTL);
}
static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
{
/* Zero out the memory to help with debug */
memset(drvdata->buf, 0, drvdata->size);
CS_UNLOCK(drvdata->base);
writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
TMC_FFCR_TRIGON_TRIGIN,
drvdata->base + TMC_FFCR);
writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
tmc_enable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
{
u32 axictl;
/* Zero out the memory to help with debug */
memset(drvdata->vaddr, 0, drvdata->size);
CS_UNLOCK(drvdata->base);
writel_relaxed(drvdata->size / 4, drvdata->base + TMC_RSZ);
writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
axictl = readl_relaxed(drvdata->base + TMC_AXICTL);
axictl |= TMC_AXICTL_WR_BURST_LEN;
writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
axictl &= ~TMC_AXICTL_SCT_GAT_MODE;
writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
axictl = (axictl &
~(TMC_AXICTL_PROT_CTL_B0 | TMC_AXICTL_PROT_CTL_B1)) |
TMC_AXICTL_PROT_CTL_B1;
writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
writel_relaxed(drvdata->paddr, drvdata->base + TMC_DBALO);
writel_relaxed(0x0, drvdata->base + TMC_DBAHI);
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
TMC_FFCR_TRIGON_TRIGIN,
drvdata->base + TMC_FFCR);
writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
tmc_enable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
writel_relaxed(TMC_MODE_HARDWARE_FIFO, drvdata->base + TMC_MODE);
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI,
drvdata->base + TMC_FFCR);
writel_relaxed(0x0, drvdata->base + TMC_BUFWM);
tmc_enable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static int tmc_enable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
{
unsigned long flags;
pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(drvdata->dev);
return -EBUSY;
}
if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
tmc_etb_enable_hw(drvdata);
} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
tmc_etr_enable_hw(drvdata);
} else {
if (mode == TMC_MODE_CIRCULAR_BUFFER)
tmc_etb_enable_hw(drvdata);
else
tmc_etf_enable_hw(drvdata);
}
drvdata->enable = true;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
dev_info(drvdata->dev, "TMC enabled\n");
return 0;
}
static int tmc_enable_sink(struct coresight_device *csdev)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
return tmc_enable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
}
static int tmc_enable_link(struct coresight_device *csdev, int inport,
int outport)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
return tmc_enable(drvdata, TMC_MODE_HARDWARE_FIFO);
}
static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
{
enum tmc_mem_intf_width memwidth;
u8 memwords;
char *bufp;
u32 read_data;
int i;
memwidth = BMVAL(readl_relaxed(drvdata->base + CORESIGHT_DEVID), 8, 10);
if (memwidth == TMC_MEM_INTF_WIDTH_32BITS)
memwords = 1;
else if (memwidth == TMC_MEM_INTF_WIDTH_64BITS)
memwords = 2;
else if (memwidth == TMC_MEM_INTF_WIDTH_128BITS)
memwords = 4;
else
memwords = 8;
bufp = drvdata->buf;
while (1) {
for (i = 0; i < memwords; i++) {
read_data = readl_relaxed(drvdata->base + TMC_RRD);
if (read_data == 0xFFFFFFFF)
return;
memcpy(bufp, &read_data, 4);
bufp += 4;
}
}
}
static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
tmc_flush_and_stop(drvdata);
tmc_etb_dump_hw(drvdata);
tmc_disable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
{
u32 rwp, val;
rwp = readl_relaxed(drvdata->base + TMC_RWP);
val = readl_relaxed(drvdata->base + TMC_STS);
/* How much memory do we still have */
if (val & BIT(0))
drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
else
drvdata->buf = drvdata->vaddr;
}
static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
tmc_flush_and_stop(drvdata);
tmc_etr_dump_hw(drvdata);
tmc_disable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
tmc_flush_and_stop(drvdata);
tmc_disable_hw(drvdata);
CS_LOCK(drvdata->base);
}
static void tmc_disable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
{
unsigned long flags;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading)
goto out;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
tmc_etb_disable_hw(drvdata);
} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
tmc_etr_disable_hw(drvdata);
} else {
if (mode == TMC_MODE_CIRCULAR_BUFFER)
tmc_etb_disable_hw(drvdata);
else
tmc_etf_disable_hw(drvdata);
}
out:
drvdata->enable = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(drvdata->dev);
dev_info(drvdata->dev, "TMC disabled\n");
}
static void tmc_disable_sink(struct coresight_device *csdev)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
tmc_disable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
}
static void tmc_disable_link(struct coresight_device *csdev, int inport,
int outport)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
tmc_disable(drvdata, TMC_MODE_HARDWARE_FIFO);
}
static const struct coresight_ops_sink tmc_sink_ops = {
.enable = tmc_enable_sink,
.disable = tmc_disable_sink,
};
static const struct coresight_ops_link tmc_link_ops = {
.enable = tmc_enable_link,
.disable = tmc_disable_link,
};
static const struct coresight_ops tmc_etb_cs_ops = {
.sink_ops = &tmc_sink_ops,
};
static const struct coresight_ops tmc_etr_cs_ops = {
.sink_ops = &tmc_sink_ops,
};
static const struct coresight_ops tmc_etf_cs_ops = {
.sink_ops = &tmc_sink_ops,
.link_ops = &tmc_link_ops,
};
static int tmc_read_prepare(struct tmc_drvdata *drvdata)
{
int ret;
unsigned long flags;
enum tmc_mode mode;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (!drvdata->enable)
goto out;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
tmc_etb_disable_hw(drvdata);
} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
tmc_etr_disable_hw(drvdata);
} else {
mode = readl_relaxed(drvdata->base + TMC_MODE);
if (mode == TMC_MODE_CIRCULAR_BUFFER) {
tmc_etb_disable_hw(drvdata);
} else {
ret = -ENODEV;
goto err;
}
}
out:
drvdata->reading = true;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
dev_info(drvdata->dev, "TMC read start\n");
return 0;
err:
spin_unlock_irqrestore(&drvdata->spinlock, flags);
return ret;
}
static void tmc_read_unprepare(struct tmc_drvdata *drvdata)
{
unsigned long flags;
enum tmc_mode mode;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (!drvdata->enable)
goto out;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
tmc_etb_enable_hw(drvdata);
} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
tmc_etr_enable_hw(drvdata);
} else {
mode = readl_relaxed(drvdata->base + TMC_MODE);
if (mode == TMC_MODE_CIRCULAR_BUFFER)
tmc_etb_enable_hw(drvdata);
}
out:
drvdata->reading = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
dev_info(drvdata->dev, "TMC read end\n");
}
static int tmc_open(struct inode *inode, struct file *file)
{
struct tmc_drvdata *drvdata = container_of(file->private_data,
struct tmc_drvdata, miscdev);
int ret = 0;
if (drvdata->read_count++)
goto out;
ret = tmc_read_prepare(drvdata);
if (ret)
return ret;
out:
nonseekable_open(inode, file);
dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
return 0;
}
static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
loff_t *ppos)
{
struct tmc_drvdata *drvdata = container_of(file->private_data,
struct tmc_drvdata, miscdev);
char *bufp = drvdata->buf + *ppos;
if (*ppos + len > drvdata->size)
len = drvdata->size - *ppos;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
if (bufp == (char *)(drvdata->vaddr + drvdata->size))
bufp = drvdata->vaddr;
else if (bufp > (char *)(drvdata->vaddr + drvdata->size))
bufp -= drvdata->size;
if ((bufp + len) > (char *)(drvdata->vaddr + drvdata->size))
len = (char *)(drvdata->vaddr + drvdata->size) - bufp;
}
if (copy_to_user(data, bufp, len)) {
dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
return -EFAULT;
}
*ppos += len;
dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
__func__, len, (int)(drvdata->size - *ppos));
return len;
}
static int tmc_release(struct inode *inode, struct file *file)
{
struct tmc_drvdata *drvdata = container_of(file->private_data,
struct tmc_drvdata, miscdev);
if (--drvdata->read_count) {
if (drvdata->read_count < 0) {
dev_err(drvdata->dev, "mismatched close\n");
drvdata->read_count = 0;
}
goto out;
}
tmc_read_unprepare(drvdata);
out:
dev_dbg(drvdata->dev, "%s: released\n", __func__);
return 0;
}
static const struct file_operations tmc_fops = {
.owner = THIS_MODULE,
.open = tmc_open,
.read = tmc_read,
.release = tmc_release,
.llseek = no_llseek,
};
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long flags;
u32 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg;
u32 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr;
u32 devid;
struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
tmc_rsz = readl_relaxed(drvdata->base + TMC_RSZ);
tmc_sts = readl_relaxed(drvdata->base + TMC_STS);
tmc_rrp = readl_relaxed(drvdata->base + TMC_RRP);
tmc_rwp = readl_relaxed(drvdata->base + TMC_RWP);
tmc_trg = readl_relaxed(drvdata->base + TMC_TRG);
tmc_ctl = readl_relaxed(drvdata->base + TMC_CTL);
tmc_ffsr = readl_relaxed(drvdata->base + TMC_FFSR);
tmc_ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
tmc_mode = readl_relaxed(drvdata->base + TMC_MODE);
tmc_pscr = readl_relaxed(drvdata->base + TMC_PSCR);
devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(drvdata->dev);
return sprintf(buf,
"Depth:\t\t0x%x\n"
"Status:\t\t0x%x\n"
"RAM read ptr:\t0x%x\n"
"RAM wrt ptr:\t0x%x\n"
"Trigger cnt:\t0x%x\n"
"Control:\t0x%x\n"
"Flush status:\t0x%x\n"
"Flush ctrl:\t0x%x\n"
"Mode:\t\t0x%x\n"
"PSRC:\t\t0x%x\n"
"DEVID:\t\t0x%x\n",
tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg,
tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr, devid);
return -EINVAL;
}
static DEVICE_ATTR_RO(status);
static ssize_t trigger_cntr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val = drvdata->trigger_cntr;
return sprintf(buf, "%#lx\n", val);
}
static ssize_t trigger_cntr_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret;
unsigned long val;
struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
ret = kstrtoul(buf, 16, &val);
if (ret)
return ret;
drvdata->trigger_cntr = val;
return size;
}
static DEVICE_ATTR_RW(trigger_cntr);
static struct attribute *coresight_etb_attrs[] = {
&dev_attr_trigger_cntr.attr,
&dev_attr_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etb);
static struct attribute *coresight_etr_attrs[] = {
&dev_attr_trigger_cntr.attr,
&dev_attr_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etr);
static struct attribute *coresight_etf_attrs[] = {
&dev_attr_trigger_cntr.attr,
&dev_attr_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etf);
static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret = 0;
u32 devid;
void __iomem *base;
struct device *dev = &adev->dev;
struct coresight_platform_data *pdata = NULL;
struct tmc_drvdata *drvdata;
struct resource *res = &adev->res;
struct coresight_desc *desc;
struct device_node *np = adev->dev.of_node;
if (np) {
pdata = of_get_coresight_platform_data(dev, np);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
adev->dev.platform_data = pdata;
}
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->dev = &adev->dev;
dev_set_drvdata(dev, drvdata);
/* Validity for the resource is already checked by the AMBA core */
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
spin_lock_init(&drvdata->spinlock);
devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
drvdata->config_type = BMVAL(devid, 6, 7);
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
if (np)
ret = of_property_read_u32(np,
"arm,buffer-size",
&drvdata->size);
if (ret)
drvdata->size = SZ_1M;
} else {
drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
}
pm_runtime_put(&adev->dev);
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
drvdata->vaddr = dma_alloc_coherent(dev, drvdata->size,
&drvdata->paddr, GFP_KERNEL);
if (!drvdata->vaddr)
return -ENOMEM;
memset(drvdata->vaddr, 0, drvdata->size);
drvdata->buf = drvdata->vaddr;
} else {
drvdata->buf = devm_kzalloc(dev, drvdata->size, GFP_KERNEL);
if (!drvdata->buf)
return -ENOMEM;
}
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc) {
ret = -ENOMEM;
goto err_devm_kzalloc;
}
desc->pdata = pdata;
desc->dev = dev;
desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
desc->type = CORESIGHT_DEV_TYPE_SINK;
desc->ops = &tmc_etb_cs_ops;
desc->groups = coresight_etb_groups;
} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
desc->type = CORESIGHT_DEV_TYPE_SINK;
desc->ops = &tmc_etr_cs_ops;
desc->groups = coresight_etr_groups;
} else {
desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
desc->ops = &tmc_etf_cs_ops;
desc->groups = coresight_etf_groups;
}
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto err_devm_kzalloc;
}
drvdata->miscdev.name = pdata->name;
drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
drvdata->miscdev.fops = &tmc_fops;
ret = misc_register(&drvdata->miscdev);
if (ret)
goto err_misc_register;
dev_info(dev, "TMC initialized\n");
return 0;
err_misc_register:
coresight_unregister(drvdata->csdev);
err_devm_kzalloc:
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
dma_free_coherent(dev, drvdata->size,
&drvdata->paddr, GFP_KERNEL);
return ret;
}
static int tmc_remove(struct amba_device *adev)
{
struct tmc_drvdata *drvdata = amba_get_drvdata(adev);
misc_deregister(&drvdata->miscdev);
coresight_unregister(drvdata->csdev);
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
dma_free_coherent(drvdata->dev, drvdata->size,
&drvdata->paddr, GFP_KERNEL);
return 0;
}
static struct amba_id tmc_ids[] = {
{
.id = 0x0003b961,
.mask = 0x0003ffff,
},
{ 0, 0},
};
static struct amba_driver tmc_driver = {
.drv = {
.name = "coresight-tmc",
.owner = THIS_MODULE,
},
.probe = tmc_probe,
.remove = tmc_remove,
.id_table = tmc_ids,
};
module_amba_driver(tmc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Trace Memory Controller driver");
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