112 строки
2.4 KiB
C
112 строки
2.4 KiB
C
/*
|
|
* Copyright 2015 Toradex AG
|
|
*
|
|
* Stefan Agner <stefan@agner.ch>
|
|
*
|
|
* Freescale TCON device driver
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "fsl_tcon.h"
|
|
|
|
void fsl_tcon_bypass_disable(struct fsl_tcon *tcon)
|
|
{
|
|
regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
|
|
FSL_TCON_CTRL1_TCON_BYPASS, 0);
|
|
}
|
|
|
|
void fsl_tcon_bypass_enable(struct fsl_tcon *tcon)
|
|
{
|
|
regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
|
|
FSL_TCON_CTRL1_TCON_BYPASS,
|
|
FSL_TCON_CTRL1_TCON_BYPASS);
|
|
}
|
|
|
|
static struct regmap_config fsl_tcon_regmap_config = {
|
|
.reg_bits = 32,
|
|
.reg_stride = 4,
|
|
.val_bits = 32,
|
|
|
|
.name = "tcon",
|
|
};
|
|
|
|
static int fsl_tcon_init_regmap(struct device *dev,
|
|
struct fsl_tcon *tcon,
|
|
struct device_node *np)
|
|
{
|
|
struct resource res;
|
|
void __iomem *regs;
|
|
|
|
if (of_address_to_resource(np, 0, &res))
|
|
return -EINVAL;
|
|
|
|
regs = devm_ioremap_resource(dev, &res);
|
|
if (IS_ERR(regs))
|
|
return PTR_ERR(regs);
|
|
|
|
tcon->regs = devm_regmap_init_mmio(dev, regs,
|
|
&fsl_tcon_regmap_config);
|
|
return PTR_ERR_OR_ZERO(tcon->regs);
|
|
}
|
|
|
|
struct fsl_tcon *fsl_tcon_init(struct device *dev)
|
|
{
|
|
struct fsl_tcon *tcon;
|
|
struct device_node *np;
|
|
int ret;
|
|
|
|
/* TCON node is not mandatory, some devices do not provide TCON */
|
|
np = of_parse_phandle(dev->of_node, "fsl,tcon", 0);
|
|
if (!np)
|
|
return NULL;
|
|
|
|
tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
|
|
if (!tcon)
|
|
goto err_node_put;
|
|
|
|
ret = fsl_tcon_init_regmap(dev, tcon, np);
|
|
if (ret) {
|
|
dev_err(dev, "Couldn't create the TCON regmap\n");
|
|
goto err_node_put;
|
|
}
|
|
|
|
tcon->ipg_clk = of_clk_get_by_name(np, "ipg");
|
|
if (IS_ERR(tcon->ipg_clk)) {
|
|
dev_err(dev, "Couldn't get the TCON bus clock\n");
|
|
goto err_node_put;
|
|
}
|
|
|
|
ret = clk_prepare_enable(tcon->ipg_clk);
|
|
if (ret) {
|
|
dev_err(dev, "Couldn't enable the TCON clock\n");
|
|
goto err_node_put;
|
|
}
|
|
|
|
of_node_put(np);
|
|
dev_info(dev, "Using TCON in bypass mode\n");
|
|
|
|
return tcon;
|
|
|
|
err_node_put:
|
|
of_node_put(np);
|
|
return NULL;
|
|
}
|
|
|
|
void fsl_tcon_free(struct fsl_tcon *tcon)
|
|
{
|
|
clk_disable_unprepare(tcon->ipg_clk);
|
|
clk_put(tcon->ipg_clk);
|
|
}
|
|
|