mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Marek Behún](/assets/img/avatar_default.png)
The input_read function declares the size of the hex array relative to
sizeof(buf), but buf is a pointer argument of the function. The hex
array is meant to contain hexadecimal representation of the bin array.
Link: https://lore.kernel.org/r/20200215142130.22743-1-marek.behun@nic.cz
Fixes: 5bc7f990cd
("bus: Add support for Moxtet bus")
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reported-by: sohu0106 <sohu0106@126.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
884 lines
19 KiB
C
884 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Turris Mox module configuration bus driver
|
|
*
|
|
* Copyright (C) 2019 Marek Behun <marek.behun@nic.cz>
|
|
*/
|
|
|
|
#include <dt-bindings/bus/moxtet.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moxtet.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
/*
|
|
* @name: module name for sysfs
|
|
* @hwirq_base: base index for IRQ for this module (-1 if no IRQs)
|
|
* @nirqs: how many interrupts does the shift register provide
|
|
* @desc: module description for kernel log
|
|
*/
|
|
static const struct {
|
|
const char *name;
|
|
int hwirq_base;
|
|
int nirqs;
|
|
const char *desc;
|
|
} mox_module_table[] = {
|
|
/* do not change order of this array! */
|
|
{ NULL, 0, 0, NULL },
|
|
{ "sfp", -1, 0, "MOX D (SFP cage)" },
|
|
{ "pci", MOXTET_IRQ_PCI, 1, "MOX B (Mini-PCIe)" },
|
|
{ "topaz", MOXTET_IRQ_TOPAZ, 1, "MOX C (4 port switch)" },
|
|
{ "peridot", MOXTET_IRQ_PERIDOT(0), 1, "MOX E (8 port switch)" },
|
|
{ "usb3", MOXTET_IRQ_USB3, 2, "MOX F (USB 3.0)" },
|
|
{ "pci-bridge", -1, 0, "MOX G (Mini-PCIe bridge)" },
|
|
};
|
|
|
|
static inline bool mox_module_known(unsigned int id)
|
|
{
|
|
return id >= TURRIS_MOX_MODULE_FIRST && id <= TURRIS_MOX_MODULE_LAST;
|
|
}
|
|
|
|
static inline const char *mox_module_name(unsigned int id)
|
|
{
|
|
if (mox_module_known(id))
|
|
return mox_module_table[id].name;
|
|
else
|
|
return "unknown";
|
|
}
|
|
|
|
#define DEF_MODULE_ATTR(name, fmt, ...) \
|
|
static ssize_t \
|
|
module_##name##_show(struct device *dev, struct device_attribute *a, \
|
|
char *buf) \
|
|
{ \
|
|
struct moxtet_device *mdev = to_moxtet_device(dev); \
|
|
return sprintf(buf, (fmt), __VA_ARGS__); \
|
|
} \
|
|
static DEVICE_ATTR_RO(module_##name)
|
|
|
|
DEF_MODULE_ATTR(id, "0x%x\n", mdev->id);
|
|
DEF_MODULE_ATTR(name, "%s\n", mox_module_name(mdev->id));
|
|
DEF_MODULE_ATTR(description, "%s\n",
|
|
mox_module_known(mdev->id) ? mox_module_table[mdev->id].desc
|
|
: "");
|
|
|
|
static struct attribute *moxtet_dev_attrs[] = {
|
|
&dev_attr_module_id.attr,
|
|
&dev_attr_module_name.attr,
|
|
&dev_attr_module_description.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group moxtet_dev_group = {
|
|
.attrs = moxtet_dev_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *moxtet_dev_groups[] = {
|
|
&moxtet_dev_group,
|
|
NULL,
|
|
};
|
|
|
|
static int moxtet_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
struct moxtet_driver *tdrv = to_moxtet_driver(drv);
|
|
const enum turris_mox_module_id *t;
|
|
|
|
if (of_driver_match_device(dev, drv))
|
|
return 1;
|
|
|
|
if (!tdrv->id_table)
|
|
return 0;
|
|
|
|
for (t = tdrv->id_table; *t; ++t)
|
|
if (*t == mdev->id)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bus_type moxtet_bus_type = {
|
|
.name = "moxtet",
|
|
.dev_groups = moxtet_dev_groups,
|
|
.match = moxtet_match,
|
|
};
|
|
|
|
int __moxtet_register_driver(struct module *owner,
|
|
struct moxtet_driver *mdrv)
|
|
{
|
|
mdrv->driver.owner = owner;
|
|
mdrv->driver.bus = &moxtet_bus_type;
|
|
return driver_register(&mdrv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__moxtet_register_driver);
|
|
|
|
static int moxtet_dev_check(struct device *dev, void *data)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
struct moxtet_device *new_dev = data;
|
|
|
|
if (mdev->moxtet == new_dev->moxtet && mdev->id == new_dev->id &&
|
|
mdev->idx == new_dev->idx)
|
|
return -EBUSY;
|
|
return 0;
|
|
}
|
|
|
|
static void moxtet_dev_release(struct device *dev)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
|
|
put_device(mdev->moxtet->dev);
|
|
kfree(mdev);
|
|
}
|
|
|
|
static struct moxtet_device *
|
|
moxtet_alloc_device(struct moxtet *moxtet)
|
|
{
|
|
struct moxtet_device *dev;
|
|
|
|
if (!get_device(moxtet->dev))
|
|
return NULL;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
put_device(moxtet->dev);
|
|
return NULL;
|
|
}
|
|
|
|
dev->moxtet = moxtet;
|
|
dev->dev.parent = moxtet->dev;
|
|
dev->dev.bus = &moxtet_bus_type;
|
|
dev->dev.release = moxtet_dev_release;
|
|
|
|
device_initialize(&dev->dev);
|
|
|
|
return dev;
|
|
}
|
|
|
|
static int moxtet_add_device(struct moxtet_device *dev)
|
|
{
|
|
static DEFINE_MUTEX(add_mutex);
|
|
int ret;
|
|
|
|
if (dev->idx >= TURRIS_MOX_MAX_MODULES || dev->id > 0xf)
|
|
return -EINVAL;
|
|
|
|
dev_set_name(&dev->dev, "moxtet-%s.%u", mox_module_name(dev->id),
|
|
dev->idx);
|
|
|
|
mutex_lock(&add_mutex);
|
|
|
|
ret = bus_for_each_dev(&moxtet_bus_type, NULL, dev,
|
|
moxtet_dev_check);
|
|
if (ret)
|
|
goto done;
|
|
|
|
ret = device_add(&dev->dev);
|
|
if (ret < 0)
|
|
dev_err(dev->moxtet->dev, "can't add %s, status %d\n",
|
|
dev_name(dev->moxtet->dev), ret);
|
|
|
|
done:
|
|
mutex_unlock(&add_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int __unregister(struct device *dev, void *null)
|
|
{
|
|
if (dev->of_node) {
|
|
of_node_clear_flag(dev->of_node, OF_POPULATED);
|
|
of_node_put(dev->of_node);
|
|
}
|
|
|
|
device_unregister(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct moxtet_device *
|
|
of_register_moxtet_device(struct moxtet *moxtet, struct device_node *nc)
|
|
{
|
|
struct moxtet_device *dev;
|
|
u32 val;
|
|
int ret;
|
|
|
|
dev = moxtet_alloc_device(moxtet);
|
|
if (!dev) {
|
|
dev_err(moxtet->dev,
|
|
"Moxtet device alloc error for %pOF\n", nc);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ret = of_property_read_u32(nc, "reg", &val);
|
|
if (ret) {
|
|
dev_err(moxtet->dev, "%pOF has no valid 'reg' property (%d)\n",
|
|
nc, ret);
|
|
goto err_put;
|
|
}
|
|
|
|
dev->idx = val;
|
|
|
|
if (dev->idx >= TURRIS_MOX_MAX_MODULES) {
|
|
dev_err(moxtet->dev, "%pOF Moxtet address 0x%x out of range\n",
|
|
nc, dev->idx);
|
|
ret = -EINVAL;
|
|
goto err_put;
|
|
}
|
|
|
|
dev->id = moxtet->modules[dev->idx];
|
|
|
|
if (!dev->id) {
|
|
dev_err(moxtet->dev, "%pOF Moxtet address 0x%x is empty\n", nc,
|
|
dev->idx);
|
|
ret = -ENODEV;
|
|
goto err_put;
|
|
}
|
|
|
|
of_node_get(nc);
|
|
dev->dev.of_node = nc;
|
|
|
|
ret = moxtet_add_device(dev);
|
|
if (ret) {
|
|
dev_err(moxtet->dev,
|
|
"Moxtet device register error for %pOF\n", nc);
|
|
of_node_put(nc);
|
|
goto err_put;
|
|
}
|
|
|
|
return dev;
|
|
|
|
err_put:
|
|
put_device(&dev->dev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void of_register_moxtet_devices(struct moxtet *moxtet)
|
|
{
|
|
struct moxtet_device *dev;
|
|
struct device_node *nc;
|
|
|
|
if (!moxtet->dev->of_node)
|
|
return;
|
|
|
|
for_each_available_child_of_node(moxtet->dev->of_node, nc) {
|
|
if (of_node_test_and_set_flag(nc, OF_POPULATED))
|
|
continue;
|
|
dev = of_register_moxtet_device(moxtet, nc);
|
|
if (IS_ERR(dev)) {
|
|
dev_warn(moxtet->dev,
|
|
"Failed to create Moxtet device for %pOF\n",
|
|
nc);
|
|
of_node_clear_flag(nc, OF_POPULATED);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
moxtet_register_devices_from_topology(struct moxtet *moxtet)
|
|
{
|
|
struct moxtet_device *dev;
|
|
int i, ret;
|
|
|
|
for (i = 0; i < moxtet->count; ++i) {
|
|
dev = moxtet_alloc_device(moxtet);
|
|
if (!dev) {
|
|
dev_err(moxtet->dev, "Moxtet device %u alloc error\n",
|
|
i);
|
|
continue;
|
|
}
|
|
|
|
dev->idx = i;
|
|
dev->id = moxtet->modules[i];
|
|
|
|
ret = moxtet_add_device(dev);
|
|
if (ret && ret != -EBUSY) {
|
|
put_device(&dev->dev);
|
|
dev_err(moxtet->dev,
|
|
"Moxtet device %u register error: %i\n", i,
|
|
ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* @nsame: how many modules with same id are already in moxtet->modules
|
|
*/
|
|
static int moxtet_set_irq(struct moxtet *moxtet, int idx, int id, int nsame)
|
|
{
|
|
int i, first;
|
|
struct moxtet_irqpos *pos;
|
|
|
|
first = mox_module_table[id].hwirq_base +
|
|
nsame * mox_module_table[id].nirqs;
|
|
|
|
if (first + mox_module_table[id].nirqs > MOXTET_NIRQS)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < mox_module_table[id].nirqs; ++i) {
|
|
pos = &moxtet->irq.position[first + i];
|
|
pos->idx = idx;
|
|
pos->bit = i;
|
|
moxtet->irq.exists |= BIT(first + i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moxtet_find_topology(struct moxtet *moxtet)
|
|
{
|
|
u8 buf[TURRIS_MOX_MAX_MODULES];
|
|
int cnts[TURRIS_MOX_MODULE_LAST];
|
|
int i, ret;
|
|
|
|
memset(cnts, 0, sizeof(cnts));
|
|
|
|
ret = spi_read(to_spi_device(moxtet->dev), buf, TURRIS_MOX_MAX_MODULES);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (buf[0] == TURRIS_MOX_CPU_ID_EMMC) {
|
|
dev_info(moxtet->dev, "Found MOX A (eMMC CPU) module\n");
|
|
} else if (buf[0] == TURRIS_MOX_CPU_ID_SD) {
|
|
dev_info(moxtet->dev, "Found MOX A (CPU) module\n");
|
|
} else {
|
|
dev_err(moxtet->dev, "Invalid Turris MOX A CPU module 0x%02x\n",
|
|
buf[0]);
|
|
return -ENODEV;
|
|
}
|
|
|
|
moxtet->count = 0;
|
|
|
|
for (i = 1; i < TURRIS_MOX_MAX_MODULES; ++i) {
|
|
int id;
|
|
|
|
if (buf[i] == 0xff)
|
|
break;
|
|
|
|
id = buf[i] & 0xf;
|
|
|
|
moxtet->modules[i-1] = id;
|
|
++moxtet->count;
|
|
|
|
if (mox_module_known(id)) {
|
|
dev_info(moxtet->dev, "Found %s module\n",
|
|
mox_module_table[id].desc);
|
|
|
|
if (moxtet_set_irq(moxtet, i-1, id, cnts[id]++) < 0)
|
|
dev_err(moxtet->dev,
|
|
" Cannot set IRQ for module %s\n",
|
|
mox_module_table[id].desc);
|
|
} else {
|
|
dev_warn(moxtet->dev,
|
|
"Unknown Moxtet module found (ID 0x%02x)\n",
|
|
id);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moxtet_spi_read(struct moxtet *moxtet, u8 *buf)
|
|
{
|
|
struct spi_transfer xfer = {
|
|
.rx_buf = buf,
|
|
.tx_buf = moxtet->tx,
|
|
.len = moxtet->count + 1
|
|
};
|
|
int ret;
|
|
|
|
mutex_lock(&moxtet->lock);
|
|
|
|
ret = spi_sync_transfer(to_spi_device(moxtet->dev), &xfer, 1);
|
|
|
|
mutex_unlock(&moxtet->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int moxtet_device_read(struct device *dev)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
struct moxtet *moxtet = mdev->moxtet;
|
|
u8 buf[TURRIS_MOX_MAX_MODULES];
|
|
int ret;
|
|
|
|
if (mdev->idx >= moxtet->count)
|
|
return -EINVAL;
|
|
|
|
ret = moxtet_spi_read(moxtet, buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return buf[mdev->idx + 1] >> 4;
|
|
}
|
|
EXPORT_SYMBOL_GPL(moxtet_device_read);
|
|
|
|
int moxtet_device_write(struct device *dev, u8 val)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
struct moxtet *moxtet = mdev->moxtet;
|
|
int ret;
|
|
|
|
if (mdev->idx >= moxtet->count)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&moxtet->lock);
|
|
|
|
moxtet->tx[moxtet->count - mdev->idx] = val;
|
|
|
|
ret = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
|
|
moxtet->count + 1);
|
|
|
|
mutex_unlock(&moxtet->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(moxtet_device_write);
|
|
|
|
int moxtet_device_written(struct device *dev)
|
|
{
|
|
struct moxtet_device *mdev = to_moxtet_device(dev);
|
|
struct moxtet *moxtet = mdev->moxtet;
|
|
|
|
if (mdev->idx >= moxtet->count)
|
|
return -EINVAL;
|
|
|
|
return moxtet->tx[moxtet->count - mdev->idx];
|
|
}
|
|
EXPORT_SYMBOL_GPL(moxtet_device_written);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static int moxtet_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
file->private_data = inode->i_private;
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static ssize_t input_read(struct file *file, char __user *buf, size_t len,
|
|
loff_t *ppos)
|
|
{
|
|
struct moxtet *moxtet = file->private_data;
|
|
u8 bin[TURRIS_MOX_MAX_MODULES];
|
|
u8 hex[sizeof(bin) * 2 + 1];
|
|
int ret, n;
|
|
|
|
ret = moxtet_spi_read(moxtet, bin);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
n = moxtet->count + 1;
|
|
bin2hex(hex, bin, n);
|
|
|
|
hex[2*n] = '\n';
|
|
|
|
return simple_read_from_buffer(buf, len, ppos, hex, 2*n + 1);
|
|
}
|
|
|
|
static const struct file_operations input_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = moxtet_debug_open,
|
|
.read = input_read,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static ssize_t output_read(struct file *file, char __user *buf, size_t len,
|
|
loff_t *ppos)
|
|
{
|
|
struct moxtet *moxtet = file->private_data;
|
|
u8 hex[TURRIS_MOX_MAX_MODULES * 2 + 1];
|
|
u8 *p = hex;
|
|
int i;
|
|
|
|
mutex_lock(&moxtet->lock);
|
|
|
|
for (i = 0; i < moxtet->count; ++i)
|
|
p = hex_byte_pack(p, moxtet->tx[moxtet->count - i]);
|
|
|
|
mutex_unlock(&moxtet->lock);
|
|
|
|
*p++ = '\n';
|
|
|
|
return simple_read_from_buffer(buf, len, ppos, hex, p - hex);
|
|
}
|
|
|
|
static ssize_t output_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct moxtet *moxtet = file->private_data;
|
|
u8 bin[TURRIS_MOX_MAX_MODULES];
|
|
u8 hex[sizeof(bin) * 2 + 1];
|
|
ssize_t res;
|
|
loff_t dummy = 0;
|
|
int err, i;
|
|
|
|
if (len > 2 * moxtet->count + 1 || len < 2 * moxtet->count)
|
|
return -EINVAL;
|
|
|
|
res = simple_write_to_buffer(hex, sizeof(hex), &dummy, buf, len);
|
|
if (res < 0)
|
|
return res;
|
|
|
|
if (len % 2 == 1 && hex[len - 1] != '\n')
|
|
return -EINVAL;
|
|
|
|
err = hex2bin(bin, hex, moxtet->count);
|
|
if (err < 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&moxtet->lock);
|
|
|
|
for (i = 0; i < moxtet->count; ++i)
|
|
moxtet->tx[moxtet->count - i] = bin[i];
|
|
|
|
err = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
|
|
moxtet->count + 1);
|
|
|
|
mutex_unlock(&moxtet->lock);
|
|
|
|
return err < 0 ? err : len;
|
|
}
|
|
|
|
static const struct file_operations output_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = moxtet_debug_open,
|
|
.read = output_read,
|
|
.write = output_write,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static int moxtet_register_debugfs(struct moxtet *moxtet)
|
|
{
|
|
struct dentry *root, *entry;
|
|
|
|
root = debugfs_create_dir("moxtet", NULL);
|
|
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
|
|
entry = debugfs_create_file_unsafe("input", 0444, root, moxtet,
|
|
&input_fops);
|
|
if (IS_ERR(entry))
|
|
goto err_remove;
|
|
|
|
entry = debugfs_create_file_unsafe("output", 0644, root, moxtet,
|
|
&output_fops);
|
|
if (IS_ERR(entry))
|
|
goto err_remove;
|
|
|
|
moxtet->debugfs_root = root;
|
|
|
|
return 0;
|
|
err_remove:
|
|
debugfs_remove_recursive(root);
|
|
return PTR_ERR(entry);
|
|
}
|
|
|
|
static void moxtet_unregister_debugfs(struct moxtet *moxtet)
|
|
{
|
|
debugfs_remove_recursive(moxtet->debugfs_root);
|
|
}
|
|
#else
|
|
static inline int moxtet_register_debugfs(struct moxtet *moxtet)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void moxtet_unregister_debugfs(struct moxtet *moxtet)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int moxtet_irq_domain_map(struct irq_domain *d, unsigned int irq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
struct moxtet *moxtet = d->host_data;
|
|
|
|
if (hw >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(hw))) {
|
|
dev_err(moxtet->dev, "Invalid hw irq number\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
irq_set_chip_data(irq, d->host_data);
|
|
irq_set_chip_and_handler(irq, &moxtet->irq.chip, handle_level_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moxtet_irq_domain_xlate(struct irq_domain *d,
|
|
struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
unsigned long *out_hwirq,
|
|
unsigned int *out_type)
|
|
{
|
|
struct moxtet *moxtet = d->host_data;
|
|
int irq;
|
|
|
|
if (WARN_ON(intsize < 1))
|
|
return -EINVAL;
|
|
|
|
irq = intspec[0];
|
|
|
|
if (irq >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(irq)))
|
|
return -EINVAL;
|
|
|
|
*out_hwirq = irq;
|
|
*out_type = IRQ_TYPE_NONE;
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops moxtet_irq_domain = {
|
|
.map = moxtet_irq_domain_map,
|
|
.xlate = moxtet_irq_domain_xlate,
|
|
};
|
|
|
|
static void moxtet_irq_mask(struct irq_data *d)
|
|
{
|
|
struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
|
|
|
|
moxtet->irq.masked |= BIT(d->hwirq);
|
|
}
|
|
|
|
static void moxtet_irq_unmask(struct irq_data *d)
|
|
{
|
|
struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
|
|
|
|
moxtet->irq.masked &= ~BIT(d->hwirq);
|
|
}
|
|
|
|
static void moxtet_irq_print_chip(struct irq_data *d, struct seq_file *p)
|
|
{
|
|
struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
|
|
struct moxtet_irqpos *pos = &moxtet->irq.position[d->hwirq];
|
|
int id;
|
|
|
|
id = moxtet->modules[pos->idx];
|
|
|
|
seq_printf(p, " moxtet-%s.%i#%i", mox_module_name(id), pos->idx,
|
|
pos->bit);
|
|
}
|
|
|
|
static const struct irq_chip moxtet_irq_chip = {
|
|
.name = "moxtet",
|
|
.irq_mask = moxtet_irq_mask,
|
|
.irq_unmask = moxtet_irq_unmask,
|
|
.irq_print_chip = moxtet_irq_print_chip,
|
|
};
|
|
|
|
static int moxtet_irq_read(struct moxtet *moxtet, unsigned long *map)
|
|
{
|
|
struct moxtet_irqpos *pos = moxtet->irq.position;
|
|
u8 buf[TURRIS_MOX_MAX_MODULES];
|
|
int i, ret;
|
|
|
|
ret = moxtet_spi_read(moxtet, buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*map = 0;
|
|
|
|
for_each_set_bit(i, &moxtet->irq.exists, MOXTET_NIRQS) {
|
|
if (!(buf[pos[i].idx + 1] & BIT(4 + pos[i].bit)))
|
|
set_bit(i, map);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t moxtet_irq_thread_fn(int irq, void *data)
|
|
{
|
|
struct moxtet *moxtet = data;
|
|
unsigned long set;
|
|
int nhandled = 0, i, sub_irq, ret;
|
|
|
|
ret = moxtet_irq_read(moxtet, &set);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
set &= ~moxtet->irq.masked;
|
|
|
|
do {
|
|
for_each_set_bit(i, &set, MOXTET_NIRQS) {
|
|
sub_irq = irq_find_mapping(moxtet->irq.domain, i);
|
|
handle_nested_irq(sub_irq);
|
|
dev_dbg(moxtet->dev, "%i irq\n", i);
|
|
++nhandled;
|
|
}
|
|
|
|
ret = moxtet_irq_read(moxtet, &set);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
set &= ~moxtet->irq.masked;
|
|
} while (set);
|
|
|
|
out:
|
|
return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
|
|
}
|
|
|
|
static void moxtet_irq_free(struct moxtet *moxtet)
|
|
{
|
|
int i, irq;
|
|
|
|
for (i = 0; i < MOXTET_NIRQS; ++i) {
|
|
if (moxtet->irq.exists & BIT(i)) {
|
|
irq = irq_find_mapping(moxtet->irq.domain, i);
|
|
irq_dispose_mapping(irq);
|
|
}
|
|
}
|
|
|
|
irq_domain_remove(moxtet->irq.domain);
|
|
}
|
|
|
|
static int moxtet_irq_setup(struct moxtet *moxtet)
|
|
{
|
|
int i, ret;
|
|
|
|
moxtet->irq.domain = irq_domain_add_simple(moxtet->dev->of_node,
|
|
MOXTET_NIRQS, 0,
|
|
&moxtet_irq_domain, moxtet);
|
|
if (moxtet->irq.domain == NULL) {
|
|
dev_err(moxtet->dev, "Could not add IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < MOXTET_NIRQS; ++i)
|
|
if (moxtet->irq.exists & BIT(i))
|
|
irq_create_mapping(moxtet->irq.domain, i);
|
|
|
|
moxtet->irq.chip = moxtet_irq_chip;
|
|
moxtet->irq.masked = ~0;
|
|
|
|
ret = request_threaded_irq(moxtet->dev_irq, NULL, moxtet_irq_thread_fn,
|
|
IRQF_ONESHOT, "moxtet", moxtet);
|
|
if (ret < 0)
|
|
goto err_free;
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
moxtet_irq_free(moxtet);
|
|
return ret;
|
|
}
|
|
|
|
static int moxtet_probe(struct spi_device *spi)
|
|
{
|
|
struct moxtet *moxtet;
|
|
int ret;
|
|
|
|
ret = spi_setup(spi);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
moxtet = devm_kzalloc(&spi->dev, sizeof(struct moxtet),
|
|
GFP_KERNEL);
|
|
if (!moxtet)
|
|
return -ENOMEM;
|
|
|
|
moxtet->dev = &spi->dev;
|
|
spi_set_drvdata(spi, moxtet);
|
|
|
|
mutex_init(&moxtet->lock);
|
|
|
|
moxtet->dev_irq = of_irq_get(moxtet->dev->of_node, 0);
|
|
if (moxtet->dev_irq == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
if (moxtet->dev_irq <= 0) {
|
|
dev_err(moxtet->dev, "No IRQ resource found\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
ret = moxtet_find_topology(moxtet);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (moxtet->irq.exists) {
|
|
ret = moxtet_irq_setup(moxtet);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
of_register_moxtet_devices(moxtet);
|
|
moxtet_register_devices_from_topology(moxtet);
|
|
|
|
ret = moxtet_register_debugfs(moxtet);
|
|
if (ret < 0)
|
|
dev_warn(moxtet->dev, "Failed creating debugfs entries: %i\n",
|
|
ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moxtet_remove(struct spi_device *spi)
|
|
{
|
|
struct moxtet *moxtet = spi_get_drvdata(spi);
|
|
|
|
free_irq(moxtet->dev_irq, moxtet);
|
|
|
|
moxtet_irq_free(moxtet);
|
|
|
|
moxtet_unregister_debugfs(moxtet);
|
|
|
|
device_for_each_child(moxtet->dev, NULL, __unregister);
|
|
|
|
mutex_destroy(&moxtet->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id moxtet_dt_ids[] = {
|
|
{ .compatible = "cznic,moxtet" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, moxtet_dt_ids);
|
|
|
|
static struct spi_driver moxtet_spi_driver = {
|
|
.driver = {
|
|
.name = "moxtet",
|
|
.of_match_table = moxtet_dt_ids,
|
|
},
|
|
.probe = moxtet_probe,
|
|
.remove = moxtet_remove,
|
|
};
|
|
|
|
static int __init moxtet_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bus_register(&moxtet_bus_type);
|
|
if (ret < 0) {
|
|
pr_err("moxtet bus registration failed: %d\n", ret);
|
|
goto error;
|
|
}
|
|
|
|
ret = spi_register_driver(&moxtet_spi_driver);
|
|
if (ret < 0) {
|
|
pr_err("moxtet spi driver registration failed: %d\n", ret);
|
|
goto error_bus;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error_bus:
|
|
bus_unregister(&moxtet_bus_type);
|
|
error:
|
|
return ret;
|
|
}
|
|
postcore_initcall_sync(moxtet_init);
|
|
|
|
static void __exit moxtet_exit(void)
|
|
{
|
|
spi_unregister_driver(&moxtet_spi_driver);
|
|
bus_unregister(&moxtet_bus_type);
|
|
}
|
|
module_exit(moxtet_exit);
|
|
|
|
MODULE_AUTHOR("Marek Behun <marek.behun@nic.cz>");
|
|
MODULE_DESCRIPTION("CZ.NIC's Turris Mox module configuration bus");
|
|
MODULE_LICENSE("GPL v2");
|