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7a1ca76dba
The Kconfig currently controlling compilation of this code is:
config RESET_ZX2967
bool "ZTE ZX2967 Reset Driver
...meaning that it currently is not being built as a module by anyone.
Lets remove the couple traces of modular infrastructure use, so that
when reading the driver there is no doubt it is builtin-only.
Since builtin_platform_driver() was already in use, the init ordering
remains unchanged with this commit.
Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
We don't replace module.h with init.h since the file does not appear
to use __init prefix anywhere.
Cc: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* ZTE's zx2967 family reset controller driver
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*
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* Copyright (C) 2017 ZTE Ltd.
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*
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* Author: Baoyou Xie <baoyou.xie@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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struct zx2967_reset {
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void __iomem *reg_base;
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spinlock_t lock;
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struct reset_controller_dev rcdev;
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};
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static int zx2967_reset_act(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct zx2967_reset *reset = NULL;
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int bank = id / 32;
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int offset = id % 32;
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u32 reg;
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unsigned long flags;
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reset = container_of(rcdev, struct zx2967_reset, rcdev);
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spin_lock_irqsave(&reset->lock, flags);
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reg = readl_relaxed(reset->reg_base + (bank * 4));
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if (assert)
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reg &= ~BIT(offset);
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else
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reg |= BIT(offset);
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writel_relaxed(reg, reset->reg_base + (bank * 4));
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spin_unlock_irqrestore(&reset->lock, flags);
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return 0;
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}
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static int zx2967_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return zx2967_reset_act(rcdev, id, true);
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}
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static int zx2967_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return zx2967_reset_act(rcdev, id, false);
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}
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static struct reset_control_ops zx2967_reset_ops = {
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.assert = zx2967_reset_assert,
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.deassert = zx2967_reset_deassert,
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};
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static int zx2967_reset_probe(struct platform_device *pdev)
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{
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struct zx2967_reset *reset;
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struct resource *res;
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reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
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if (!reset)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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reset->reg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(reset->reg_base))
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return PTR_ERR(reset->reg_base);
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spin_lock_init(&reset->lock);
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reset->rcdev.owner = THIS_MODULE;
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reset->rcdev.nr_resets = resource_size(res) * 8;
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reset->rcdev.ops = &zx2967_reset_ops;
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reset->rcdev.of_node = pdev->dev.of_node;
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return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
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}
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static const struct of_device_id zx2967_reset_dt_ids[] = {
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{ .compatible = "zte,zx296718-reset", },
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{},
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};
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static struct platform_driver zx2967_reset_driver = {
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.probe = zx2967_reset_probe,
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.driver = {
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.name = "zx2967-reset",
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.of_match_table = zx2967_reset_dt_ids,
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},
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};
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builtin_platform_driver(zx2967_reset_driver);
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