diff options
author | Álvaro Fernández Rojas <noltari@gmail.com> | 2017-04-25 01:39:14 +0300 |
---|---|---|
committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2017-05-10 17:16:09 +0300 |
commit | e388969178a471fed636f127faa49b141bd18aab (patch) | |
tree | c736a5310821cdc533275cba90f082bef2bf7030 /drivers/sysreset/sysreset_syscon.c | |
parent | 22c2c17915ba3f18d958bbf2c2f2c7facf2194cf (diff) | |
download | u-boot-e388969178a471fed636f127faa49b141bd18aab.tar.xz |
sysreset: add syscon-reboot driver
Add a new sysreset driver based on linux/drivers/power/reset/syscon-reboot.c,
which provides a generic driver for platforms that only require writing a mask
to a regmap offset.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/sysreset/sysreset_syscon.c')
-rw-r--r-- | drivers/sysreset/sysreset_syscon.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/sysreset/sysreset_syscon.c b/drivers/sysreset/sysreset_syscon.c new file mode 100644 index 0000000000..3818faeb46 --- /dev/null +++ b/drivers/sysreset/sysreset_syscon.c @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com> + * + * Derived from linux/drivers/power/reset/syscon-reboot.c: + * Copyright (C) 2013, Applied Micro Circuits Corporation + * Author: Feng Kan <fkan@apm.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <regmap.h> +#include <sysreset.h> +#include <syscon.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct syscon_reboot_priv { + struct regmap *regmap; + unsigned int offset; + unsigned int mask; +}; + +static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type) +{ + struct syscon_reboot_priv *priv = dev_get_priv(dev); + + regmap_write(priv->regmap, priv->offset, priv->mask); + + return -EINPROGRESS; +} + +static struct sysreset_ops syscon_reboot_ops = { + .request = syscon_reboot_request, +}; + +int syscon_reboot_probe(struct udevice *dev) +{ + struct udevice *syscon; + struct syscon_reboot_priv *priv = dev_get_priv(dev); + int err; + + err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, + "regmap", &syscon); + if (err) { + error("unable to find syscon device\n"); + return err; + } + + priv->regmap = syscon_get_regmap(syscon); + if (!priv->regmap) { + error("unable to find regmap\n"); + return -ENODEV; + } + + priv->offset = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), + "offset", 0); + priv->mask = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), + "mask", 0); + + return 0; +} + +static const struct udevice_id syscon_reboot_ids[] = { + { .compatible = "syscon-reboot" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(syscon_reboot) = { + .name = "syscon_reboot", + .id = UCLASS_SYSRESET, + .of_match = syscon_reboot_ids, + .probe = syscon_reboot_probe, + .priv_auto_alloc_size = sizeof(struct syscon_reboot_priv), + .ops = &syscon_reboot_ops, +}; |