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| author | Kristofer Jonsson <kristofer.jonsson@arm.com> | 2023-01-23 13:05:36 +0100 |
|---|---|---|
| committer | Kristofer Jonsson <kristofer.jonsson@arm.com> | 2023-02-02 16:30:40 +0100 |
| commit | 074ef905e834cff238e708f2e673e100884218ba (patch) | |
| tree | a99762832b461441b0319e984b3ecdb908efe433 /kernel/ethosu_driver.c | |
| parent | ec47704ab3fd50a9ef8339f33139ddae4caa00b6 (diff) | |
| download | ethos-u-linux-driver-stack-074ef905e834cff238e708f2e673e100884218ba.tar.gz | |
Create device for Ethos-U kernel driver
When the Ethos-U kernel driver is probed it creates a /dev/ethosu<nr>
device node, which user space use ioctl to communicate with. When
the driver is removed the Ethos-U resources must live on until all
open file handles have been closed.
The rpmsg device can be removed for a number of reasons, for example
if the firmware is stopped or the remoteproc driver is removed. To
allow the remove to complete without waiting for all file handles to
close, a new 'struct device' is created by the kernel driver. This
device will be used to memory allocations and will live on until the
last file handle has been closed.
Change-Id: I790d8219960f25fe64f58c11a865eb65c7b08974
Diffstat (limited to 'kernel/ethosu_driver.c')
| -rw-r--r-- | kernel/ethosu_driver.c | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/kernel/ethosu_driver.c b/kernel/ethosu_driver.c index 6e5bfb9..342f501 100644 --- a/kernel/ethosu_driver.c +++ b/kernel/ethosu_driver.c @@ -38,8 +38,6 @@ #define MINOR_BASE 0 /* Minor version starts at 0 */ #define MINOR_COUNT 64 /* Allocate minor versions */ -#define DMA_ADDR_BITS 32 /* Number of address bits */ - /**************************************************************************** * Variables ****************************************************************************/ @@ -48,8 +46,6 @@ static struct class *ethosu_class; static dev_t devt; -static DECLARE_BITMAP(minors, MINOR_COUNT); - /**************************************************************************** * Rpmsg driver ****************************************************************************/ @@ -57,35 +53,24 @@ static DECLARE_BITMAP(minors, MINOR_COUNT); static int ethosu_rpmsg_probe(struct rpmsg_device *rpdev) { struct device *dev = &rpdev->dev; - int minor; int ret; - /* Reserve minor number for device node */ - minor = find_first_zero_bit(minors, MINOR_COUNT); - if (minor >= MINOR_COUNT) { - dev_err(dev, "No more minor numbers."); - - return -ENOMEM; - } + dev_info(dev, "%s", __FUNCTION__); /* Initialize device */ - ret = ethosu_dev_init(rpdev, ethosu_class, MKDEV(MAJOR(devt), minor)); + ret = ethosu_dev_init(rpdev, ethosu_class, devt); if (ret) return ret; - set_bit(minor, minors); - return 0; } static void ethosu_rpmsg_remove(struct rpmsg_device *rpdev) { struct device *dev = &rpdev->dev; - struct ethosu_device *edev = dev_get_drvdata(dev); dev_info(dev, "%s", __FUNCTION__); - clear_bit(MINOR(edev->devt), minors); ethosu_dev_deinit(rpdev); } |