Commit 2d8bc619 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman

Merge tag 'fsi-updates-2018-07-27' of...

Merge tag 'fsi-updates-2018-07-27' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/linux-fsi into char-misc-next

Ben writes:

Last round of FSI updates for 4.19

This adds a few fixes for things reported since the last merge,
and the latch batch of changes pending for FSI for 4.19.

That batch is a rather mechanical conversion of the misc devices
into proper char devices.

The misc devices were ill suited, the minor space for them is
limited and we can have a lot of chips in a system creating FSI
devices.

This also allows us to better control (and fix) object lifetime
getting rid of the bad devm_kzalloc() of the structures containing
the devices etc...

Finally, we add a chardev to the core FSI that provides raw CFAM
access to FSI slaves as a replacement for the current "raw" binary
sysfs file which will be ultimately deprecated and removed.
parents 2d8ff0b5 9840fcd8
......@@ -12,6 +12,21 @@ menuconfig FSI
if FSI
config FSI_NEW_DEV_NODE
bool "Create '/dev/fsi' directory for char devices"
default n
---help---
This option causes char devices created for FSI devices to be
located under a common /dev/fsi/ directory. Set to N unless your
userspace has been updated to handle the new location.
Additionally, it also causes the char device names to be offset
by one so that chip 0 will have /dev/scom1 and chip1 /dev/scom2
to match old userspace expectations.
New userspace will use udev rules to generate predictable access
symlinks in /dev/fsi/by-path when this option is enabled.
config FSI_MASTER_GPIO
tristate "GPIO-based FSI master"
depends on GPIOLIB
......
......@@ -11,6 +11,11 @@
* 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.
*
* TODO:
* - Rework topology
* - s/chip_id/chip_loc
* - s/cfam/chip (cfam_id -> chip_id etc...)
*/
#include <linux/crc4.h>
......@@ -21,6 +26,9 @@
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include "fsi-master.h"
......@@ -78,8 +86,11 @@ static DEFINE_IDA(master_ida);
struct fsi_slave {
struct device dev;
struct fsi_master *master;
int id;
int link;
struct cdev cdev;
int cdev_idx;
int id; /* FSI address */
int link; /* FSI link# */
u32 cfam_id;
int chip_id;
uint32_t size; /* size of slave address space */
u8 t_send_delay;
......@@ -92,6 +103,13 @@ struct fsi_slave {
static const int slave_retries = 2;
static int discard_errors;
static dev_t fsi_base_dev;
static DEFINE_IDA(fsi_minor_ida);
#define FSI_CHAR_MAX_DEVICES 0x1000
/* Legacy /dev numbering: 4 devices per chip, 16 chips */
#define FSI_CHAR_LEGACY_TOP 64
static int fsi_master_read(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, void *val, size_t size);
static int fsi_master_write(struct fsi_master *master, int link,
......@@ -600,33 +618,11 @@ static const struct bin_attribute fsi_slave_raw_attr = {
.write = fsi_slave_sysfs_raw_write,
};
static ssize_t fsi_slave_sysfs_term_write(struct file *file,
struct kobject *kobj, struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
struct fsi_master *master = slave->master;
if (!master->term)
return -ENODEV;
master->term(master, slave->link, slave->id);
return count;
}
static const struct bin_attribute fsi_slave_term_attr = {
.attr = {
.name = "term",
.mode = 0200,
},
.size = 0,
.write = fsi_slave_sysfs_term_write,
};
static void fsi_slave_release(struct device *dev)
{
struct fsi_slave *slave = to_fsi_slave(dev);
fsi_free_minor(slave->dev.devt);
of_node_put(dev->of_node);
kfree(slave);
}
......@@ -674,6 +670,127 @@ static struct device_node *fsi_slave_find_of_node(struct fsi_master *master,
return NULL;
}
static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count,
loff_t *offset)
{
struct fsi_slave *slave = filep->private_data;
size_t total_len, read_len;
loff_t off = *offset;
ssize_t rc;
if (off < 0)
return -EINVAL;
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
return -EINVAL;
for (total_len = 0; total_len < count; total_len += read_len) {
__be32 data;
read_len = min_t(size_t, count, 4);
read_len -= off & 0x3;
rc = fsi_slave_read(slave, off, &data, read_len);
if (rc)
goto fail;
rc = copy_to_user(buf + total_len, &data, read_len);
if (rc) {
rc = -EFAULT;
goto fail;
}
off += read_len;
}
rc = count;
fail:
*offset = off;
return count;
}
static ssize_t cfam_write(struct file *filep, const char __user *buf,
size_t count, loff_t *offset)
{
struct fsi_slave *slave = filep->private_data;
size_t total_len, write_len;
loff_t off = *offset;
ssize_t rc;
if (off < 0)
return -EINVAL;
if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
return -EINVAL;
for (total_len = 0; total_len < count; total_len += write_len) {
__be32 data;
write_len = min_t(size_t, count, 4);
write_len -= off & 0x3;
rc = copy_from_user(&data, buf + total_len, write_len);
if (rc) {
rc = -EFAULT;
goto fail;
}
rc = fsi_slave_write(slave, off, &data, write_len);
if (rc)
goto fail;
off += write_len;
}
rc = count;
fail:
*offset = off;
return count;
}
static loff_t cfam_llseek(struct file *file, loff_t offset, int whence)
{
switch (whence) {
case SEEK_CUR:
break;
case SEEK_SET:
file->f_pos = offset;
break;
default:
return -EINVAL;
}
return offset;
}
static int cfam_open(struct inode *inode, struct file *file)
{
struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev);
file->private_data = slave;
return 0;
}
static const struct file_operations cfam_fops = {
.owner = THIS_MODULE,
.open = cfam_open,
.llseek = cfam_llseek,
.read = cfam_read,
.write = cfam_write,
};
static ssize_t send_term_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct fsi_slave *slave = to_fsi_slave(dev);
struct fsi_master *master = slave->master;
if (!master->term)
return -ENODEV;
master->term(master, slave->link, slave->id);
return count;
}
static DEVICE_ATTR_WO(send_term);
static ssize_t slave_send_echo_show(struct device *dev,
struct device_attribute *attr,
char *buf)
......@@ -729,9 +846,124 @@ static ssize_t chip_id_show(struct device *dev,
static DEVICE_ATTR_RO(chip_id);
static ssize_t cfam_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct fsi_slave *slave = to_fsi_slave(dev);
return sprintf(buf, "0x%x\n", slave->cfam_id);
}
static DEVICE_ATTR_RO(cfam_id);
static struct attribute *cfam_attr[] = {
&dev_attr_send_echo_delays.attr,
&dev_attr_chip_id.attr,
&dev_attr_cfam_id.attr,
&dev_attr_send_term.attr,
NULL,
};
static const struct attribute_group cfam_attr_group = {
.attrs = cfam_attr,
};
static const struct attribute_group *cfam_attr_groups[] = {
&cfam_attr_group,
NULL,
};
static char *cfam_devnode(struct device *dev, umode_t *mode,
kuid_t *uid, kgid_t *gid)
{
struct fsi_slave *slave = to_fsi_slave(dev);
#ifdef CONFIG_FSI_NEW_DEV_NODE
return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx);
#else
return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx);
#endif
}
static const struct device_type cfam_type = {
.name = "cfam",
.devnode = cfam_devnode,
.groups = cfam_attr_groups
};
static char *fsi_cdev_devnode(struct device *dev, umode_t *mode,
kuid_t *uid, kgid_t *gid)
{
#ifdef CONFIG_FSI_NEW_DEV_NODE
return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev));
#else
return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
#endif
}
const struct device_type fsi_cdev_type = {
.name = "fsi-cdev",
.devnode = fsi_cdev_devnode,
};
EXPORT_SYMBOL_GPL(fsi_cdev_type);
/* Backward compatible /dev/ numbering in "old style" mode */
static int fsi_adjust_index(int index)
{
#ifdef CONFIG_FSI_NEW_DEV_NODE
return index;
#else
return index + 1;
#endif
}
static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
dev_t *out_dev, int *out_index)
{
int cid = slave->chip_id;
int id;
/* Check if we qualify for legacy numbering */
if (cid >= 0 && cid < 16 && type < 4) {
/* Try reserving the legacy number */
id = (cid << 4) | type;
id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL);
if (id >= 0) {
*out_index = fsi_adjust_index(cid);
*out_dev = fsi_base_dev + id;
return 0;
}
/* Other failure */
if (id != -ENOSPC)
return id;
/* Fallback to non-legacy allocation */
}
id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP,
FSI_CHAR_MAX_DEVICES, GFP_KERNEL);
if (id < 0)
return id;
*out_index = fsi_adjust_index(id);
*out_dev = fsi_base_dev + id;
return 0;
}
int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
dev_t *out_dev, int *out_index)
{
return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index);
}
EXPORT_SYMBOL_GPL(fsi_get_new_minor);
void fsi_free_minor(dev_t dev)
{
ida_simple_remove(&fsi_minor_ida, MINOR(dev));
}
EXPORT_SYMBOL_GPL(fsi_free_minor);
static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
{
uint32_t chip_id;
uint32_t cfam_id;
struct fsi_slave *slave;
uint8_t crc;
__be32 data, llmode;
......@@ -749,17 +981,17 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
link, id, rc);
return -ENODEV;
}
chip_id = be32_to_cpu(data);
cfam_id = be32_to_cpu(data);
crc = crc4(0, chip_id, 32);
crc = crc4(0, cfam_id, 32);
if (crc) {
dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n",
dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n",
link, id);
return -EIO;
}
dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
chip_id, master->idx, link, id);
cfam_id, master->idx, link, id);
/* If we're behind a master that doesn't provide a self-running bus
* clock, put the slave into async mode
......@@ -782,10 +1014,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
if (!slave)
return -ENOMEM;
slave->master = master;
dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
slave->dev.type = &cfam_type;
slave->dev.parent = &master->dev;
slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
slave->dev.release = fsi_slave_release;
device_initialize(&slave->dev);
slave->cfam_id = cfam_id;
slave->master = master;
slave->link = link;
slave->id = id;
slave->size = FSI_SLAVE_SIZE_23b;
......@@ -800,6 +1036,21 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
slave->chip_id = prop;
}
/* Allocate a minor in the FSI space */
rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt,
&slave->cdev_idx);
if (rc)
goto err_free;
/* Create chardev for userspace access */
cdev_init(&slave->cdev, &cfam_fops);
rc = cdev_device_add(&slave->cdev, &slave->dev);
if (rc) {
dev_err(&slave->dev, "Error %d creating slave device\n", rc);
goto err_free;
}
rc = fsi_slave_set_smode(slave);
if (rc) {
dev_warn(&master->dev,
......@@ -813,30 +1064,11 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
slave->t_send_delay,
slave->t_echo_delay);
dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
rc = device_register(&slave->dev);
if (rc < 0) {
dev_warn(&master->dev, "failed to create slave device: %d\n",
rc);
put_device(&slave->dev);
return rc;
}
/* Legacy raw file -> to be removed */
rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr);
if (rc)
dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc);
rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr);
if (rc)
dev_warn(&slave->dev, "failed to create term attr: %d\n", rc);
rc = device_create_file(&slave->dev, &dev_attr_send_echo_delays);
if (rc)
dev_warn(&slave->dev, "failed to create delay attr: %d\n", rc);
rc = device_create_file(&slave->dev, &dev_attr_chip_id);
if (rc)
dev_warn(&slave->dev, "failed to create chip id: %d\n", rc);
rc = fsi_slave_scan(slave);
if (rc)
......@@ -844,6 +1076,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
rc);
return rc;
err_free:
put_device(&slave->dev);
return rc;
}
/* FSI master support */
......@@ -952,8 +1188,11 @@ static int fsi_slave_remove_device(struct device *dev, void *arg)
static int fsi_master_remove_slave(struct device *dev, void *arg)
{
struct fsi_slave *slave = to_fsi_slave(dev);
device_for_each_child(dev, NULL, fsi_slave_remove_device);
device_unregister(dev);
cdev_device_del(&slave->cdev, &slave->dev);
put_device(dev);
return 0;
}
......@@ -964,8 +1203,14 @@ static void fsi_master_unscan(struct fsi_master *master)
int fsi_master_rescan(struct fsi_master *master)
{
int rc;
mutex_lock(&master->scan_lock);
fsi_master_unscan(master);
return fsi_master_scan(master);
rc = fsi_master_scan(master);
mutex_unlock(&master->scan_lock);
return rc;
}
EXPORT_SYMBOL_GPL(fsi_master_rescan);
......@@ -1001,6 +1246,7 @@ int fsi_master_register(struct fsi_master *master)
int rc;
struct device_node *np;
mutex_init(&master->scan_lock);
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
dev_set_name(&master->dev, "fsi%d", master->idx);
......@@ -1025,8 +1271,11 @@ int fsi_master_register(struct fsi_master *master)
}
np = dev_of_node(&master->dev);
if (!of_property_read_bool(np, "no-scan-on-init"))
if (!of_property_read_bool(np, "no-scan-on-init")) {
mutex_lock(&master->scan_lock);
fsi_master_scan(master);
mutex_unlock(&master->scan_lock);
}
return 0;
}
......@@ -1039,7 +1288,9 @@ void fsi_master_unregister(struct fsi_master *master)
master->idx = -1;
}
mutex_lock(&master->scan_lock);
fsi_master_unscan(master);
mutex_unlock(&master->scan_lock);
device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(fsi_master_unregister);
......@@ -1091,13 +1342,27 @@ EXPORT_SYMBOL_GPL(fsi_bus_type);
static int __init fsi_init(void)
{
return bus_register(&fsi_bus_type);
int rc;
rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi");
if (rc)
return rc;
rc = bus_register(&fsi_bus_type);
if (rc)
goto fail_bus;
return 0;
fail_bus:
unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
return rc;
}
postcore_initcall(fsi_init);
static void fsi_exit(void)
{
bus_unregister(&fsi_bus_type);
unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES);
ida_destroy(&fsi_minor_ida);
}
module_exit(fsi_exit);
module_param(discard_errors, int, 0664);
......
......@@ -377,8 +377,8 @@ static int send_request(struct fsi_master_acf *master, struct fsi_msg *cmd,
static int read_copro_response(struct fsi_master_acf *master, uint8_t size,
uint32_t *response, u8 *tag)
{
uint8_t rtag = ioread8(master->sram + STAT_RTAG);
uint8_t rcrc = ioread8(master->sram + STAT_RCRC);
uint8_t rtag = ioread8(master->sram + STAT_RTAG) & 0xf;
uint8_t rcrc = ioread8(master->sram + STAT_RCRC) & 0xf;
uint32_t rdata = 0;
uint32_t crc;
uint8_t ack;
......@@ -437,7 +437,7 @@ static int send_term(struct fsi_master_acf *master, uint8_t slave)
return 0;
}
static void dump_trace(struct fsi_master_acf *master)
static void dump_ucode_trace(struct fsi_master_acf *master)
{
char trbuf[52];
char *p;
......@@ -488,7 +488,7 @@ static int handle_response(struct fsi_master_acf *master,
}
trace_fsi_master_acf_crc_rsp_error(master, crc_err_retries);
if (master->trace_enabled)
dump_trace(master);
dump_ucode_trace(master);
rc = clock_zeros(master, FSI_MASTER_EPOLL_CLOCKS);
if (rc) {
dev_warn(master->dev,
......@@ -525,7 +525,7 @@ static int handle_response(struct fsi_master_acf *master,
*/
dev_dbg(master->dev, "Busy, retrying...\n");
if (master->trace_enabled)
dump_trace(master);
dump_ucode_trace(master);
rc = clock_zeros(master, FSI_MASTER_DPOLL_CLOCKS);
if (rc) {
dev_warn(master->dev,
......@@ -550,13 +550,13 @@ static int handle_response(struct fsi_master_acf *master,
case FSI_RESP_ERRA:
dev_dbg(master->dev, "ERRA received\n");
if (master->trace_enabled)
dump_trace(master);
dump_ucode_trace(master);
rc = -EIO;
break;
case FSI_RESP_ERRC:
dev_dbg(master->dev, "ERRC received\n");
if (master->trace_enabled)
dump_trace(master);
dump_ucode_trace(master);
rc = -EAGAIN;
break;
}
......@@ -606,7 +606,7 @@ static int fsi_master_acf_read(struct fsi_master *_master, int link,
return -ENODEV;
mutex_lock(&master->lock);
dev_dbg(master->dev, "read id %d addr %x size %ud\n", id, addr, size);
dev_dbg(master->dev, "read id %d addr %x size %zd\n", id, addr, size);
build_ar_command(master, &cmd, id, addr, size, NULL);
rc = fsi_master_acf_xfer(master, id, &cmd, size, val);
last_address_update(master, id, rc == 0, addr);
......@@ -631,7 +631,7 @@ static int fsi_master_acf_write(struct fsi_master *_master, int link,
mutex_lock(&master->lock);
build_ar_command(master, &cmd, id, addr, size, val);
dev_dbg(master->dev, "write id %d addr %x size %ud raw_data: %08x\n",
dev_dbg(master->dev, "write id %d addr %x size %zd raw_data: %08x\n",
id, addr, size, *(uint32_t *)val);
rc = fsi_master_acf_xfer(master, id, &cmd, 0, NULL);
last_address_update(master, id, rc == 0, addr);
......@@ -861,7 +861,8 @@ static int load_copro_firmware(struct fsi_master_acf *master)
if (sig != wanted_sig) {
dev_err(master->dev, "Failed to locate image sig %04x in FW blob\n",
wanted_sig);
return -ENODEV;
rc = -ENODEV;
goto release_fw;
}
if (size > master->cf_mem_size) {
dev_err(master->dev, "FW size (%zd) bigger than memory reserve (%zd)\n",
......@@ -870,8 +871,9 @@ static int load_copro_firmware(struct fsi_master_acf *master)
} else {
memcpy_toio(master->cf_mem, data, size);
}
release_firmware(fw);
release_fw:
release_firmware(fw);
return rc;
}
......
......@@ -18,6 +18,7 @@
#define DRIVERS_FSI_MASTER_H
#include <linux/device.h>
#include <linux/mutex.h>
/* Various protocol delays */
#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
......@@ -59,6 +60,7 @@ struct fsi_master {
int idx;
int n_links;
int flags;
struct mutex scan_lock;
int (*read)(struct fsi_master *, int link, uint8_t id,
uint32_t addr, void *val, size_t size);
int (*write)(struct fsi_master *, int link, uint8_t id,
......
......@@ -17,9 +17,8 @@
#include <linux/fs.h>
#include <linux/fsi.h>
#include <linux/fsi-sbefifo.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/cdev.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
......@@ -118,11 +117,11 @@ struct sbefifo {
uint32_t magic;
#define SBEFIFO_MAGIC 0x53424546 /* "SBEF" */
struct fsi_device *fsi_dev;
struct miscdevice mdev;
struct device dev;
struct cdev cdev;
struct mutex lock;
char name[32];
int idx;
bool broken;
bool dead;
bool async_ffdc;
};
......@@ -133,9 +132,9 @@ struct sbefifo_user {
size_t pending_len;
};
static DEFINE_IDA(sbefifo_ida);
static DEFINE_MUTEX(sbefifo_ffdc_mutex);
static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc,
size_t ffdc_sz, bool internal)
{
......@@ -667,6 +666,9 @@ static int __sbefifo_submit(struct sbefifo *sbefifo,
struct device *dev = &sbefifo->fsi_dev->dev;
int rc;
if (sbefifo->dead)
return -ENODEV;
if (cmd_len < 2 || be32_to_cpu(command[0]) != cmd_len) {
dev_vdbg(dev, "Invalid command len %zd (header: %d)\n",
cmd_len, be32_to_cpu(command[0]));
......@@ -751,8 +753,7 @@ EXPORT_SYMBOL_GPL(sbefifo_submit);
*/
static int sbefifo_user_open(struct inode *inode, struct file *file)
{
struct sbefifo *sbefifo = container_of(file->private_data,
struct sbefifo, mdev);
struct sbefifo *sbefifo = container_of(inode->i_cdev, struct sbefifo, cdev);
struct sbefifo_user *user;
user = kzalloc(sizeof(struct sbefifo_user), GFP_KERNEL);
......@@ -889,6 +890,14 @@ static const struct file_operations sbefifo_fops = {
.release = sbefifo_user_release,
};
static void sbefifo_free(struct device *dev)
{
struct sbefifo *sbefifo = container_of(dev, struct sbefifo, dev);
put_device(&sbefifo->fsi_dev->dev);
kfree(sbefifo);
}
/*
* Probe/remove
*/
......@@ -900,15 +909,23 @@ static int sbefifo_probe(struct device *dev)
struct device_node *np;
struct platform_device *child;
char child_name[32];
int rc, child_idx = 0;
int rc, didx, child_idx = 0;
dev_dbg(dev, "Found sbefifo device\n");
sbefifo = devm_kzalloc(dev, sizeof(*sbefifo), GFP_KERNEL);
sbefifo = kzalloc(sizeof(*sbefifo), GFP_KERNEL);
if (!sbefifo)
return -ENOMEM;
/* Grab a reference to the device (parent of our cdev), we'll drop it later */
if (!get_device(dev)) {
kfree(sbefifo);
return -ENODEV;
}
sbefifo->magic = SBEFIFO_MAGIC;
sbefifo->fsi_dev = fsi_dev;
dev_set_drvdata(dev, sbefifo);
mutex_init(&sbefifo->lock);
/*
......@@ -919,28 +936,30 @@ static int sbefifo_probe(struct device *dev)
if (rc && rc != -ESHUTDOWN)
dev_err(dev, "Initial HW cleanup failed, will retry later\n");
sbefifo->idx = ida_simple_get(&sbefifo_ida, 1, INT_MAX, GFP_KERNEL);
snprintf(sbefifo->name, sizeof(sbefifo->name), "sbefifo%d",
sbefifo->idx);
/* Create chardev for userspace access */
sbefifo->dev.type = &fsi_cdev_type;
sbefifo->dev.parent = dev;
sbefifo->dev.release = sbefifo_free;
device_initialize(&sbefifo->dev);
dev_set_drvdata(dev, sbefifo);
/* Allocate a minor in the FSI space */
rc = fsi_get_new_minor(fsi_dev, fsi_dev_sbefifo, &sbefifo->dev.devt, &didx);
if (rc)
goto err;
/* Create misc chardev for userspace access */
sbefifo->mdev.minor = MISC_DYNAMIC_MINOR;
sbefifo->mdev.fops = &sbefifo_fops;
sbefifo->mdev.name = sbefifo->name;
sbefifo->mdev.parent = dev;
rc = misc_register(&sbefifo->mdev);
dev_set_name(&sbefifo->dev, "sbefifo%d", didx);
cdev_init(&sbefifo->cdev, &sbefifo_fops);
rc = cdev_device_add(&sbefifo->cdev, &sbefifo->dev);
if (rc) {
dev_err(dev, "Failed to register miscdevice: %d\n", rc);
ida_simple_remove(&sbefifo_ida, sbefifo->idx);
return rc;
dev_err(dev, "Error %d creating char device %s\n",
rc, dev_name(&sbefifo->dev));
goto err_free_minor;
}
/* Create platform devs for dts child nodes (occ, etc) */
for_each_available_child_of_node(dev->of_node, np) {
snprintf(child_name, sizeof(child_name), "%s-dev%d",
sbefifo->name, child_idx++);
dev_name(&sbefifo->dev), child_idx++);
child = of_platform_device_create(np, child_name, dev);
if (!child)
dev_warn(dev, "failed to create child %s dev\n",
......@@ -948,6 +967,11 @@ static int sbefifo_probe(struct device *dev)
}
return 0;
err_free_minor:
fsi_free_minor(sbefifo->dev.devt);
err:
put_device(&sbefifo->dev);
return rc;
}
static int sbefifo_unregister_child(struct device *dev, void *data)
......@@ -967,10 +991,14 @@ static int sbefifo_remove(struct device *dev)
dev_dbg(dev, "Removing sbefifo device...\n");
misc_deregister(&sbefifo->mdev);
device_for_each_child(dev, NULL, sbefifo_unregister_child);
mutex_lock(&sbefifo->lock);
sbefifo->dead = true;
mutex_unlock(&sbefifo->lock);
ida_simple_remove(&sbefifo_ida, sbefifo->idx);
cdev_device_del(&sbefifo->cdev, &sbefifo->dev);
fsi_free_minor(sbefifo->dev.devt);
device_for_each_child(dev, NULL, sbefifo_unregister_child);
put_device(&sbefifo->dev);
return 0;
}
......@@ -1001,8 +1029,6 @@ static int sbefifo_init(void)
static void sbefifo_exit(void)
{
fsi_driver_unregister(&sbefifo_drv);
ida_destroy(&sbefifo_ida);
}
module_init(sbefifo_init);
......
......@@ -20,9 +20,8 @@
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <linux/idr.h>
#include <uapi/linux/fsi.h>
......@@ -77,18 +76,12 @@
struct scom_device {
struct list_head link;
struct fsi_device *fsi_dev;
struct miscdevice mdev;
struct device dev;
struct cdev cdev;
struct mutex lock;
char name[32];
int idx;
bool dead;
};
#define to_scom_dev(x) container_of((x), struct scom_device, mdev)
static struct list_head scom_devices;
static DEFINE_IDA(scom_ida);
static int __put_scom(struct scom_device *scom_dev, uint64_t value,
uint32_t addr, uint32_t *status)
{
......@@ -374,9 +367,7 @@ static int get_scom(struct scom_device *scom, uint64_t *value,
static ssize_t scom_read(struct file *filep, char __user *buf, size_t len,
loff_t *offset)
{
struct miscdevice *mdev =
(struct miscdevice *)filep->private_data;
struct scom_device *scom = to_scom_dev(mdev);
struct scom_device *scom = filep->private_data;
struct device *dev = &scom->fsi_dev->dev;
uint64_t val;
int rc;
......@@ -385,7 +376,10 @@ static ssize_t scom_read(struct file *filep, char __user *buf, size_t len,
return -EINVAL;
mutex_lock(&scom->lock);
rc = get_scom(scom, &val, *offset);
if (scom->dead)
rc = -ENODEV;
else
rc = get_scom(scom, &val, *offset);
mutex_unlock(&scom->lock);
if (rc) {
dev_dbg(dev, "get_scom fail:%d\n", rc);
......@@ -403,8 +397,7 @@ static ssize_t scom_write(struct file *filep, const char __user *buf,
size_t len, loff_t *offset)
{
int rc;
struct miscdevice *mdev = filep->private_data;
struct scom_device *scom = to_scom_dev(mdev);
struct scom_device *scom = filep->private_data;
struct device *dev = &scom->fsi_dev->dev;
uint64_t val;
......@@ -418,7 +411,10 @@ static ssize_t scom_write(struct file *filep, const char __user *buf,
}
mutex_lock(&scom->lock);
rc = put_scom(scom, val, *offset);
if (scom->dead)
rc = -ENODEV;
else
rc = put_scom(scom, val, *offset);
mutex_unlock(&scom->lock);
if (rc) {
dev_dbg(dev, "put_scom failed with:%d\n", rc);
......@@ -532,12 +528,15 @@ static int scom_check(struct scom_device *scom, void __user *argp)
static long scom_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct miscdevice *mdev = file->private_data;
struct scom_device *scom = to_scom_dev(mdev);
struct scom_device *scom = file->private_data;
void __user *argp = (void __user *)arg;
int rc = -ENOTTY;
mutex_lock(&scom->lock);
if (scom->dead) {
mutex_unlock(&scom->lock);
return -ENODEV;
}
switch(cmd) {
case FSI_SCOM_CHECK:
rc = scom_check(scom, argp);
......@@ -556,48 +555,88 @@ static long scom_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return rc;
}
static int scom_open(struct inode *inode, struct file *file)
{
struct scom_device *scom = container_of(inode->i_cdev, struct scom_device, cdev);
file->private_data = scom;
return 0;
}
static const struct file_operations scom_fops = {
.owner = THIS_MODULE,
.open = scom_open,
.llseek = scom_llseek,
.read = scom_read,
.write = scom_write,
.unlocked_ioctl = scom_ioctl,
};
static void scom_free(struct device *dev)
{
struct scom_device *scom = container_of(dev, struct scom_device, dev);
put_device(&scom->fsi_dev->dev);
kfree(scom);
}
static int scom_probe(struct device *dev)
{
struct fsi_device *fsi_dev = to_fsi_dev(dev);
struct scom_device *scom;
int rc, didx;
scom = devm_kzalloc(dev, sizeof(*scom), GFP_KERNEL);
scom = kzalloc(sizeof(*scom), GFP_KERNEL);
if (!scom)
return -ENOMEM;
dev_set_drvdata(dev, scom);
mutex_init(&scom->lock);
scom->idx = ida_simple_get(&scom_ida, 1, INT_MAX, GFP_KERNEL);
snprintf(scom->name, sizeof(scom->name), "scom%d", scom->idx);
scom->fsi_dev = fsi_dev;
scom->mdev.minor = MISC_DYNAMIC_MINOR;
scom->mdev.fops = &scom_fops;
scom->mdev.name = scom->name;
scom->mdev.parent = dev;
list_add(&scom->link, &scom_devices);
return misc_register(&scom->mdev);
/* Grab a reference to the device (parent of our cdev), we'll drop it later */
if (!get_device(dev)) {
kfree(scom);
return -ENODEV;
}
/* Create chardev for userspace access */
scom->dev.type = &fsi_cdev_type;
scom->dev.parent = dev;
scom->dev.release = scom_free;
device_initialize(&scom->dev);
/* Allocate a minor in the FSI space */
rc = fsi_get_new_minor(fsi_dev, fsi_dev_scom, &scom->dev.devt, &didx);
if (rc)
goto err;
dev_set_name(&scom->dev, "scom%d", didx);
cdev_init(&scom->cdev, &scom_fops);
rc = cdev_device_add(&scom->cdev, &scom->dev);
if (rc) {
dev_err(dev, "Error %d creating char device %s\n",
rc, dev_name(&scom->dev));
goto err_free_minor;
}
return 0;
err_free_minor:
fsi_free_minor(scom->dev.devt);
err:
put_device(&scom->dev);
return rc;
}
static int scom_remove(struct device *dev)
{
struct scom_device *scom, *scom_tmp;
struct fsi_device *fsi_dev = to_fsi_dev(dev);
struct scom_device *scom = dev_get_drvdata(dev);
list_for_each_entry_safe(scom, scom_tmp, &scom_devices, link) {
if (scom->fsi_dev == fsi_dev) {
list_del(&scom->link);
ida_simple_remove(&scom_ida, scom->idx);
misc_deregister(&scom->mdev);
}
}
mutex_lock(&scom->lock);
scom->dead = true;
mutex_unlock(&scom->lock);
cdev_device_del(&scom->cdev, &scom->dev);
fsi_free_minor(scom->dev.devt);
put_device(&scom->dev);
return 0;
}
......@@ -622,20 +661,11 @@ static struct fsi_driver scom_drv = {
static int scom_init(void)
{
INIT_LIST_HEAD(&scom_devices);
return fsi_driver_register(&scom_drv);
}
static void scom_exit(void)
{
struct list_head *pos;
struct scom_device *scom;
list_for_each(pos, &scom_devices) {
scom = list_entry(pos, struct scom_device, link);
misc_deregister(&scom->mdev);
devm_kfree(&scom->fsi_dev->dev, scom);
}
fsi_driver_unregister(&scom_drv);
}
......
......@@ -76,8 +76,18 @@ extern int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
extern int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
const void *val, size_t size);
extern struct bus_type fsi_bus_type;
extern const struct device_type fsi_cdev_type;
enum fsi_dev_type {
fsi_dev_cfam,
fsi_dev_sbefifo,
fsi_dev_scom,
fsi_dev_occ
};
extern struct bus_type fsi_bus_type;
extern int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
dev_t *out_dev, int *out_index);
extern void fsi_free_minor(dev_t dev);
#endif /* LINUX_FSI_H */
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