diff options
Diffstat (limited to 'drivers/misc/reset-uclass.c')
-rw-r--r-- | drivers/misc/reset-uclass.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/misc/reset-uclass.c b/drivers/misc/reset-uclass.c new file mode 100644 index 0000000000..fdb5c6fcff --- /dev/null +++ b/drivers/misc/reset-uclass.c @@ -0,0 +1,81 @@ +/* + * Copyright (C) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <reset.h> +#include <dm.h> +#include <errno.h> +#include <regmap.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/root.h> +#include <linux/err.h> + +int reset_request(struct udevice *dev, enum reset_t type) +{ + struct reset_ops *ops = reset_get_ops(dev); + + if (!ops->request) + return -ENOSYS; + + return ops->request(dev, type); +} + +int reset_walk(enum reset_t type) +{ + struct udevice *dev; + int ret = -ENOSYS; + + while (ret != -EINPROGRESS && type < RESET_COUNT) { + for (uclass_first_device(UCLASS_RESET, &dev); + dev; + uclass_next_device(&dev)) { + ret = reset_request(dev, type); + if (ret == -EINPROGRESS) + break; + } + type++; + } + + return ret; +} + +void reset_walk_halt(enum reset_t type) +{ + int ret; + + ret = reset_walk(type); + + /* Wait for the reset to take effect */ + if (ret == -EINPROGRESS) + mdelay(100); + + /* Still no reset? Give up */ + printf("Reset not supported on this platform\n"); + hang(); +} + +/** + * reset_cpu() - calls reset_walk(RESET_WARM) + */ +void reset_cpu(ulong addr) +{ + reset_walk_halt(RESET_WARM); +} + + +int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + reset_walk_halt(RESET_WARM); + + return 0; +} + +UCLASS_DRIVER(reset) = { + .id = UCLASS_RESET, + .name = "reset", +}; |