2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2015 Toradex AG
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*
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* Stefan Agner <stefan@agner.ch>
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*
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* Freescale TCON device driver
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/mm.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 "fsl_tcon.h"
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void fsl_tcon_bypass_disable(struct fsl_tcon *tcon)
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{
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regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
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FSL_TCON_CTRL1_TCON_BYPASS, 0);
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}
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void fsl_tcon_bypass_enable(struct fsl_tcon *tcon)
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{
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regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
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FSL_TCON_CTRL1_TCON_BYPASS,
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FSL_TCON_CTRL1_TCON_BYPASS);
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}
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static struct regmap_config fsl_tcon_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.name = "tcon",
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};
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static int fsl_tcon_init_regmap(struct device *dev,
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struct fsl_tcon *tcon,
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struct device_node *np)
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{
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struct resource res;
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void __iomem *regs;
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if (of_address_to_resource(np, 0, &res))
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return -EINVAL;
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regs = devm_ioremap_resource(dev, &res);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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tcon->regs = devm_regmap_init_mmio(dev, regs,
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&fsl_tcon_regmap_config);
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return PTR_ERR_OR_ZERO(tcon->regs);
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}
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struct fsl_tcon *fsl_tcon_init(struct device *dev)
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{
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struct fsl_tcon *tcon;
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struct device_node *np;
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int ret;
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/* TCON node is not mandatory, some devices do not provide TCON */
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np = of_parse_phandle(dev->of_node, "fsl,tcon", 0);
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if (!np)
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return NULL;
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tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
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if (!tcon)
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goto err_node_put;
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ret = fsl_tcon_init_regmap(dev, tcon, np);
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if (ret) {
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dev_err(dev, "Couldn't create the TCON regmap\n");
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goto err_node_put;
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}
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tcon->ipg_clk = of_clk_get_by_name(np, "ipg");
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if (IS_ERR(tcon->ipg_clk)) {
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dev_err(dev, "Couldn't get the TCON bus clock\n");
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goto err_node_put;
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}
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ret = clk_prepare_enable(tcon->ipg_clk);
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if (ret) {
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dev_err(dev, "Couldn't enable the TCON clock\n");
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goto err_node_put;
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}
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of_node_put(np);
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dev_info(dev, "Using TCON in bypass mode\n");
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return tcon;
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err_node_put:
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of_node_put(np);
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return NULL;
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}
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void fsl_tcon_free(struct fsl_tcon *tcon)
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{
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clk_disable_unprepare(tcon->ipg_clk);
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clk_put(tcon->ipg_clk);
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}
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