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. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJbWmGjAAoJEHM62YSLdExeJs4P/jcy6NQJmEeFtzd2qKK+4ciQ dcZMaymLTPDWFAbhtWc8bv723NsEfMxcd91rIQdcL2331fdcxSmXpKAICCgZn73a 9p2slsgPwOPKB4NNfIGE373K8TfqmRhhDvyNfaAD/eq6T+8vj1l5eJejvt9wCL2v koa98FOv7Urp4rZWlGySAkDEvfeN06VZ8jdYN80S7Vd6fy3s5wtdzCKK66wGsESz TU+Dijaj2i4cNUGlChHD0a6ZYYhG54KeT8k/oaqjnPBfIwQJtReSn7ad6nVEHt2Q fqAEn0sPnffpwO3Ao3Z0jPTN5lyDUtNTqggT9iPUUnyLSLBe9Ab8opTzsv+xVscr D6SsVPn3I5YiN22Dxcvv7KFJ5OX4Dv4Ul/SzXb17tt95OEckJkFoH49mmpTOefdv thEiIt8PbksBjyOKpmSHdrV3rppkd9zmJUnPOA/Rj6da+ngF706VOSYASxUd6s6y VtImTCxihYzwG5MSSYVmBi+gp5T91IOFlbw8XXjad8Cf4tydzJjm5dAl920SVUzS gxN04LhIQtDL+GrAjmxDOvPC25Skcd0rRdgeDT9RHfXGHZP95uhgIsZPPGGg73i7 52AQPSJDjzeBF5EDizQlDw5RW1TDRxGlDNbgnSMd969dhoVDo8uM6KwDmq4iWPKC QTObqJg5JGtxjmfgYhPH =ho3P -----END PGP SIGNATURE----- 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.
This commit is contained in:
Greg Kroah-Hartman
commit
2d8bc61952
@ -12,6 +12,21 @@ menuconfig FSI
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if FSI
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config FSI_NEW_DEV_NODE
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bool "Create '/dev/fsi' directory for char devices"
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default n
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---help---
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This option causes char devices created for FSI devices to be
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located under a common /dev/fsi/ directory. Set to N unless your
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userspace has been updated to handle the new location.
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Additionally, it also causes the char device names to be offset
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by one so that chip 0 will have /dev/scom1 and chip1 /dev/scom2
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to match old userspace expectations.
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New userspace will use udev rules to generate predictable access
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symlinks in /dev/fsi/by-path when this option is enabled.
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config FSI_MASTER_GPIO
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tristate "GPIO-based FSI master"
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depends on GPIOLIB
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@ -11,6 +11,11 @@
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* TODO:
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* - Rework topology
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* - s/chip_id/chip_loc
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* - s/cfam/chip (cfam_id -> chip_id etc...)
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*/
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#include <linux/crc4.h>
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@ -21,6 +26,9 @@
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include "fsi-master.h"
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@ -78,8 +86,11 @@ static DEFINE_IDA(master_ida);
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struct fsi_slave {
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struct device dev;
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struct fsi_master *master;
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int id;
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int link;
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struct cdev cdev;
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int cdev_idx;
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int id; /* FSI address */
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int link; /* FSI link# */
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u32 cfam_id;
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int chip_id;
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uint32_t size; /* size of slave address space */
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u8 t_send_delay;
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@ -92,6 +103,13 @@ struct fsi_slave {
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static const int slave_retries = 2;
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static int discard_errors;
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static dev_t fsi_base_dev;
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static DEFINE_IDA(fsi_minor_ida);
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#define FSI_CHAR_MAX_DEVICES 0x1000
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/* Legacy /dev numbering: 4 devices per chip, 16 chips */
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#define FSI_CHAR_LEGACY_TOP 64
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static int fsi_master_read(struct fsi_master *master, int link,
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uint8_t slave_id, uint32_t addr, void *val, size_t size);
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static int fsi_master_write(struct fsi_master *master, int link,
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@ -600,33 +618,11 @@ static const struct bin_attribute fsi_slave_raw_attr = {
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.write = fsi_slave_sysfs_raw_write,
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};
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static ssize_t fsi_slave_sysfs_term_write(struct file *file,
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struct kobject *kobj, struct bin_attribute *attr,
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char *buf, loff_t off, size_t count)
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{
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struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj));
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struct fsi_master *master = slave->master;
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if (!master->term)
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return -ENODEV;
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master->term(master, slave->link, slave->id);
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return count;
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}
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static const struct bin_attribute fsi_slave_term_attr = {
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.attr = {
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.name = "term",
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.mode = 0200,
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},
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.size = 0,
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.write = fsi_slave_sysfs_term_write,
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};
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static void fsi_slave_release(struct device *dev)
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{
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struct fsi_slave *slave = to_fsi_slave(dev);
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fsi_free_minor(slave->dev.devt);
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of_node_put(dev->of_node);
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kfree(slave);
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}
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@ -674,6 +670,127 @@ static struct device_node *fsi_slave_find_of_node(struct fsi_master *master,
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return NULL;
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}
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static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count,
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loff_t *offset)
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{
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struct fsi_slave *slave = filep->private_data;
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size_t total_len, read_len;
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loff_t off = *offset;
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ssize_t rc;
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if (off < 0)
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return -EINVAL;
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if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
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return -EINVAL;
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for (total_len = 0; total_len < count; total_len += read_len) {
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__be32 data;
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read_len = min_t(size_t, count, 4);
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read_len -= off & 0x3;
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rc = fsi_slave_read(slave, off, &data, read_len);
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if (rc)
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goto fail;
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rc = copy_to_user(buf + total_len, &data, read_len);
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if (rc) {
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rc = -EFAULT;
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goto fail;
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}
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off += read_len;
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}
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rc = count;
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fail:
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*offset = off;
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return count;
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}
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static ssize_t cfam_write(struct file *filep, const char __user *buf,
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size_t count, loff_t *offset)
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{
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struct fsi_slave *slave = filep->private_data;
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size_t total_len, write_len;
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loff_t off = *offset;
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ssize_t rc;
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if (off < 0)
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return -EINVAL;
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if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
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return -EINVAL;
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for (total_len = 0; total_len < count; total_len += write_len) {
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__be32 data;
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write_len = min_t(size_t, count, 4);
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write_len -= off & 0x3;
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rc = copy_from_user(&data, buf + total_len, write_len);
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if (rc) {
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rc = -EFAULT;
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goto fail;
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}
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rc = fsi_slave_write(slave, off, &data, write_len);
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if (rc)
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goto fail;
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off += write_len;
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}
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rc = count;
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fail:
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*offset = off;
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return count;
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}
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static loff_t cfam_llseek(struct file *file, loff_t offset, int whence)
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{
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switch (whence) {
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case SEEK_CUR:
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break;
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case SEEK_SET:
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file->f_pos = offset;
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break;
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default:
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return -EINVAL;
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}
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return offset;
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}
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static int cfam_open(struct inode *inode, struct file *file)
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{
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struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev);
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file->private_data = slave;
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return 0;
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}
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static const struct file_operations cfam_fops = {
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.owner = THIS_MODULE,
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.open = cfam_open,
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.llseek = cfam_llseek,
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.read = cfam_read,
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.write = cfam_write,
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};
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static ssize_t send_term_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct fsi_slave *slave = to_fsi_slave(dev);
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struct fsi_master *master = slave->master;
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if (!master->term)
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return -ENODEV;
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master->term(master, slave->link, slave->id);
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return count;
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}
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static DEVICE_ATTR_WO(send_term);
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static ssize_t slave_send_echo_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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@ -729,9 +846,124 @@ static ssize_t chip_id_show(struct device *dev,
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static DEVICE_ATTR_RO(chip_id);
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static ssize_t cfam_id_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct fsi_slave *slave = to_fsi_slave(dev);
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return sprintf(buf, "0x%x\n", slave->cfam_id);
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}
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static DEVICE_ATTR_RO(cfam_id);
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static struct attribute *cfam_attr[] = {
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&dev_attr_send_echo_delays.attr,
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&dev_attr_chip_id.attr,
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&dev_attr_cfam_id.attr,
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&dev_attr_send_term.attr,
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NULL,
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};
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static const struct attribute_group cfam_attr_group = {
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.attrs = cfam_attr,
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};
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static const struct attribute_group *cfam_attr_groups[] = {
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&cfam_attr_group,
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NULL,
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};
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static char *cfam_devnode(struct device *dev, umode_t *mode,
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kuid_t *uid, kgid_t *gid)
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{
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struct fsi_slave *slave = to_fsi_slave(dev);
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#ifdef CONFIG_FSI_NEW_DEV_NODE
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return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx);
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#else
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return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx);
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#endif
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}
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static const struct device_type cfam_type = {
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.name = "cfam",
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.devnode = cfam_devnode,
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.groups = cfam_attr_groups
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};
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static char *fsi_cdev_devnode(struct device *dev, umode_t *mode,
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kuid_t *uid, kgid_t *gid)
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{
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#ifdef CONFIG_FSI_NEW_DEV_NODE
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return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev));
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#else
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return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
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#endif
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}
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const struct device_type fsi_cdev_type = {
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.name = "fsi-cdev",
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.devnode = fsi_cdev_devnode,
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};
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EXPORT_SYMBOL_GPL(fsi_cdev_type);
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/* Backward compatible /dev/ numbering in "old style" mode */
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static int fsi_adjust_index(int index)
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{
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#ifdef CONFIG_FSI_NEW_DEV_NODE
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return index;
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#else
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return index + 1;
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#endif
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}
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static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
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dev_t *out_dev, int *out_index)
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{
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int cid = slave->chip_id;
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int id;
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/* Check if we qualify for legacy numbering */
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if (cid >= 0 && cid < 16 && type < 4) {
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/* Try reserving the legacy number */
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id = (cid << 4) | type;
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id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL);
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if (id >= 0) {
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*out_index = fsi_adjust_index(cid);
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*out_dev = fsi_base_dev + id;
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return 0;
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}
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/* Other failure */
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if (id != -ENOSPC)
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return id;
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/* Fallback to non-legacy allocation */
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}
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id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP,
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FSI_CHAR_MAX_DEVICES, GFP_KERNEL);
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if (id < 0)
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return id;
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*out_index = fsi_adjust_index(id);
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*out_dev = fsi_base_dev + id;
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return 0;
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}
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int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
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dev_t *out_dev, int *out_index)
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{
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return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index);
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}
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EXPORT_SYMBOL_GPL(fsi_get_new_minor);
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void fsi_free_minor(dev_t dev)
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{
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ida_simple_remove(&fsi_minor_ida, MINOR(dev));
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}
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EXPORT_SYMBOL_GPL(fsi_free_minor);
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static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
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{
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uint32_t chip_id;
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uint32_t cfam_id;
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struct fsi_slave *slave;
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uint8_t crc;
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__be32 data, llmode;
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@ -749,17 +981,17 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
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link, id, rc);
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return -ENODEV;
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}
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chip_id = be32_to_cpu(data);
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cfam_id = be32_to_cpu(data);
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crc = crc4(0, chip_id, 32);
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crc = crc4(0, cfam_id, 32);
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if (crc) {
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dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n",
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dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n",
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link, id);
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return -EIO;
|
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}
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dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
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chip_id, master->idx, link, id);
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cfam_id, master->idx, link, id);
|
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|
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/* If we're behind a master that doesn't provide a self-running bus
|
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* clock, put the slave into async mode
|
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@ -782,10 +1014,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
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if (!slave)
|
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return -ENOMEM;
|
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|
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slave->master = master;
|
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dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
|
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slave->dev.type = &cfam_type;
|
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slave->dev.parent = &master->dev;
|
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slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
|
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slave->dev.release = fsi_slave_release;
|
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device_initialize(&slave->dev);
|
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slave->cfam_id = cfam_id;
|
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slave->master = master;
|
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slave->link = link;
|
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slave->id = id;
|
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slave->size = FSI_SLAVE_SIZE_23b;
|
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@ -800,6 +1036,21 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
|
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slave->chip_id = prop;
|
||||
|
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}
|
||||
|
||||
/* Allocate a minor in the FSI space */
|
||||
rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt,
|
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&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;
|
||||
}
|
||||
|
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rc = fsi_slave_set_smode(slave);
|
||||
if (rc) {
|
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dev_warn(&master->dev,
|
||||
@ -813,30 +1064,11 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
|
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slave->t_send_delay,
|
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slave->t_echo_delay);
|
||||
|
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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 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 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user