diff options
Diffstat (limited to 'kernel/ethosu_driver.c')
| -rw-r--r-- | kernel/ethosu_driver.c | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/kernel/ethosu_driver.c b/kernel/ethosu_driver.c index 3fc752b..9d02431 100644 --- a/kernel/ethosu_driver.c +++ b/kernel/ethosu_driver.c @@ -18,6 +18,8 @@ * SPDX-License-Identifier: GPL-2.0-only */ +#include <linux/bitmap.h> +#include <linux/fs.h> #include <linux/module.h> #include <linux/io.h> #include <linux/of.h> @@ -33,11 +35,18 @@ #define ETHOSU_DRIVER_VERSION "1.0" #define ETHOSU_DRIVER_NAME "ethosu" +#define MINOR_BASE 0 /* Minor version starts at 0 */ +#define MINOR_COUNT 64 /* Allocate minor versions */ + /**************************************************************************** * Variables ****************************************************************************/ -struct class *ethosu_class; +static struct class *ethosu_class; + +static dev_t devt; + +static DECLARE_BITMAP(minors, MINOR_COUNT); /**************************************************************************** * Arm Ethos-U @@ -48,10 +57,18 @@ static int ethosu_pdev_probe(struct platform_device *pdev) struct ethosu_device *edev; struct resource *in_queue_res; struct resource *out_queue_res; + int minor; int ret; dev_info(&pdev->dev, "Probe\n"); + minor = find_first_zero_bit(minors, MINOR_COUNT); + if (minor >= MINOR_COUNT) { + dev_err(&pdev->dev, "No more minor numbers.\n"); + + return -ENOMEM; + } + /* Get path to TCM memory */ in_queue_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "in_queue"); @@ -77,11 +94,14 @@ static int ethosu_pdev_probe(struct platform_device *pdev) platform_set_drvdata(pdev, edev); /* Initialize device */ - ret = ethosu_dev_init(edev, &pdev->dev, ethosu_class, in_queue_res, + ret = ethosu_dev_init(edev, &pdev->dev, ethosu_class, + MKDEV(MAJOR(devt), minor), in_queue_res, out_queue_res); if (ret) goto free_dev; + set_bit(minor, minors); + return 0; free_dev: @@ -94,8 +114,7 @@ static int ethosu_pdev_remove(struct platform_device *pdev) { struct ethosu_device *edev = platform_get_drvdata(pdev); - dev_info(&pdev->dev, "Remove\n"); - + clear_bit(MINOR(edev->devt), minors); ethosu_dev_deinit(edev); return 0; @@ -133,14 +152,24 @@ static int __init ethosu_init(void) return PTR_ERR(ethosu_class); } + ret = alloc_chrdev_region(&devt, MINOR_BASE, MINOR_COUNT, + ETHOSU_DRIVER_NAME); + if (ret) { + printk("Failed to allocate chrdev region.\n"); + goto destroy_class; + } + ret = platform_driver_register(ðosu_pdev_driver); if (ret) { printk("Failed to register Arm Ethos-U platform driver.\n"); - goto destroy_class; + goto region_unregister; } return 0; +region_unregister: + unregister_chrdev_region(devt, MINOR_COUNT); + destroy_class: class_destroy(ethosu_class); @@ -150,6 +179,7 @@ destroy_class: static void __exit ethosu_exit(void) { platform_driver_unregister(ðosu_pdev_driver); + unregister_chrdev_region(devt, MINOR_COUNT); class_destroy(ethosu_class); } |