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104 lines
2.5 KiB
104 lines
2.5 KiB
/* |
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* Copyright (C) 2014 Marvell Technology Group Ltd. |
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* |
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* Marvell Berlin reset driver |
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* |
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* Antoine Tenart <[email protected]> |
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* Sebastian Hesselbarth <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/reset-controller.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#define BERLIN_MAX_RESETS 32 |
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#define to_berlin_reset_priv(p) \ |
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container_of((p), struct berlin_reset_priv, rcdev) |
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struct berlin_reset_priv { |
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struct regmap *regmap; |
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struct reset_controller_dev rcdev; |
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}; |
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static int berlin_reset_reset(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev); |
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int offset = id >> 8; |
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int mask = BIT(id & 0x1f); |
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regmap_write(priv->regmap, offset, mask); |
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/* let the reset be effective */ |
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udelay(10); |
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return 0; |
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} |
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static const struct reset_control_ops berlin_reset_ops = { |
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.reset = berlin_reset_reset, |
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}; |
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static int berlin_reset_xlate(struct reset_controller_dev *rcdev, |
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const struct of_phandle_args *reset_spec) |
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{ |
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unsigned offset, bit; |
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offset = reset_spec->args[0]; |
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bit = reset_spec->args[1]; |
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if (bit >= BERLIN_MAX_RESETS) |
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return -EINVAL; |
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return (offset << 8) | bit; |
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} |
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static int berlin2_reset_probe(struct platform_device *pdev) |
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{ |
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struct device_node *parent_np = of_get_parent(pdev->dev.of_node); |
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struct berlin_reset_priv *priv; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->regmap = syscon_node_to_regmap(parent_np); |
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of_node_put(parent_np); |
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if (IS_ERR(priv->regmap)) |
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return PTR_ERR(priv->regmap); |
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priv->rcdev.owner = THIS_MODULE; |
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priv->rcdev.ops = &berlin_reset_ops; |
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priv->rcdev.of_node = pdev->dev.of_node; |
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priv->rcdev.of_reset_n_cells = 2; |
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priv->rcdev.of_xlate = berlin_reset_xlate; |
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return reset_controller_register(&priv->rcdev); |
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} |
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static const struct of_device_id berlin_reset_dt_match[] = { |
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{ .compatible = "marvell,berlin2-reset" }, |
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{ }, |
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}; |
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static struct platform_driver berlin_reset_driver = { |
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.probe = berlin2_reset_probe, |
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.driver = { |
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.name = "berlin2-reset", |
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.of_match_table = berlin_reset_dt_match, |
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}, |
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}; |
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builtin_platform_driver(berlin_reset_driver);
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