112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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