diff options
author | Simon Glass <sjg@chromium.org> | 2015-06-23 21:38:43 (GMT) |
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committer | Simon Glass <sjg@chromium.org> | 2015-07-21 23:39:24 (GMT) |
commit | 5725128507eca41bb110d702858ca2c8d7dc4085 (patch) | |
tree | 64ad9fddd8e970d2cb610b956a5a31f248e43fc4 /drivers/core/syscon-uclass.c | |
parent | 6f98b7504f7097ea36df451c58d718f3ad2aa4ea (diff) | |
download | u-boot-fsl-qoriq-5725128507eca41bb110d702858ca2c8d7dc4085.tar.xz |
dm: Add support for generic system controllers (syscon)
Many SoCs have a number of system controllers which are dealt with as a
group by a single driver. It is a pain to have to add lots of compatible
strings and/or separate drivers for each. Instead we can identify the
controllers by a number and request the address of the one we want.
Add a simple implementation of this which can be used by SoC driver code.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core/syscon-uclass.c')
-rw-r--r-- | drivers/core/syscon-uclass.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/core/syscon-uclass.c b/drivers/core/syscon-uclass.c new file mode 100644 index 0000000..4d66bb5 --- /dev/null +++ b/drivers/core/syscon-uclass.c @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2015 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <syscon.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> + +struct regmap *syscon_get_regmap(struct udevice *dev) +{ + struct syscon_uc_info *priv = dev_get_uclass_priv(dev); + + return priv->regmap; +} + +static int syscon_pre_probe(struct udevice *dev) +{ + struct syscon_uc_info *priv = dev_get_uclass_priv(dev); + + return regmap_init_mem(dev, &priv->regmap); +} + +struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data) +{ + struct udevice *dev; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_SYSCON, &uc); + if (ret) + return ERR_PTR(ret); + uclass_foreach_dev(dev, uc) { + if (dev->driver_data == driver_data) { + struct syscon_uc_info *priv; + int ret; + + ret = device_probe(dev); + if (ret) + return ERR_PTR(ret); + priv = dev_get_uclass_priv(dev); + + return priv->regmap; + } + } + + return ERR_PTR(-ENOENT); +} + +void *syscon_get_first_range(ulong driver_data) +{ + struct regmap *map; + + map = syscon_get_regmap_by_driver_data(driver_data); + if (IS_ERR(map)) + return map; + return regmap_get_range(map, 0); +} + +UCLASS_DRIVER(syscon) = { + .id = UCLASS_SYSCON, + .name = "syscon", + .per_device_auto_alloc_size = sizeof(struct syscon_uc_info), + .pre_probe = syscon_pre_probe, +}; |