diff options
Diffstat (limited to 'drivers/reset/reset-mediatek.c')
-rw-r--r-- | drivers/reset/reset-mediatek.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/reset/reset-mediatek.c b/drivers/reset/reset-mediatek.c new file mode 100644 index 0000000000..e3614e6e2a --- /dev/null +++ b/drivers/reset/reset-mediatek.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 MediaTek Inc. + * + * Author: Ryder Lee <ryder.lee@mediatek.com> + * Weijie Gao <weijie.gao@mediatek.com> + */ + +#include <common.h> +#include <dm.h> +#include <dm/lists.h> +#include <regmap.h> +#include <reset-uclass.h> +#include <syscon.h> + +struct mediatek_reset_priv { + struct regmap *regmap; + u32 regofs; + u32 nr_resets; +}; + +static int mediatek_reset_request(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int mediatek_reset_free(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int mediatek_reset_assert(struct reset_ctl *reset_ctl) +{ + struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev); + int id = reset_ctl->id; + + if (id >= priv->nr_resets) + return -EINVAL; + + return regmap_update_bits(priv->regmap, + priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32)); +} + +static int mediatek_reset_deassert(struct reset_ctl *reset_ctl) +{ + struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev); + int id = reset_ctl->id; + + if (id >= priv->nr_resets) + return -EINVAL; + + return regmap_update_bits(priv->regmap, + priv->regofs + ((id / 32) << 2), BIT(id % 32), 0); +} + +struct reset_ops mediatek_reset_ops = { + .request = mediatek_reset_request, + .free = mediatek_reset_free, + .rst_assert = mediatek_reset_assert, + .rst_deassert = mediatek_reset_deassert, +}; + +static int mediatek_reset_probe(struct udevice *dev) +{ + struct mediatek_reset_priv *priv = dev_get_priv(dev); + + if (!priv->regofs && !priv->nr_resets) + return -EINVAL; + + priv->regmap = syscon_node_to_regmap(dev_ofnode(dev)); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + return 0; +} + +int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs) +{ + struct udevice *rst_dev; + struct mediatek_reset_priv *priv; + int ret; + + ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset", + dev_ofnode(pdev), &rst_dev); + if (ret) + return ret; + + priv = malloc(sizeof(struct mediatek_reset_priv)); + priv->regofs = regofs; + priv->nr_resets = num_regs * 32; + rst_dev->priv = priv; + + return 0; +} + +U_BOOT_DRIVER(mediatek_reset) = { + .name = "mediatek_reset", + .id = UCLASS_RESET, + .probe = mediatek_reset_probe, + .ops = &mediatek_reset_ops, + .priv_auto_alloc_size = sizeof(struct mediatek_reset_priv), +}; |