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/*
* Arasan Secure Digital Host Controller Interface.
* Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
* Copyright (c) 2012 Wind River Systems, Inc.
* Copyright (C) 2013 Pengutronix e.K.
* Copyright (C) 2013 Xilinx Inc.
*
* Based on sdhci-of-esdhc.c
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
* Copyright (c) 2009 MontaVista Software, Inc.
*
* Authors: Xiaobo Xie <X.Xie@freescale.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*
* 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/module.h>
#include "sdhci-pltfm.h"
#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
#define CLK_CTRL_TIMEOUT_SHIFT 16
#define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
#define CLK_CTRL_TIMEOUT_MIN_EXP 13
/**
* struct sdhci_arasan_data
* @clk_ahb: Pointer to the AHB clock
*/
struct sdhci_arasan_data {
struct clk *clk_ahb;
};
static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
{
u32 div;
unsigned long freq;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET);
div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT;
freq = clk_get_rate(pltfm_host->clk);
freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div);
return freq;
}
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_timeout_clock = sdhci_arasan_get_timeout_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static struct sdhci_pltfm_data sdhci_arasan_pdata = {
.ops = &sdhci_arasan_ops,
};
#ifdef CONFIG_PM_SLEEP
/**
* sdhci_arasan_suspend - Suspend method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
*
* Put the device in a low power state.
*/
static int sdhci_arasan_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
int ret;
ret = sdhci_suspend_host(host);
if (ret)
return ret;
clk_disable(pltfm_host->clk);
clk_disable(sdhci_arasan->clk_ahb);
return 0;
}
/**
* sdhci_arasan_resume - Resume method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
*
* Resume operation after suspend
*/
static int sdhci_arasan_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
int ret;
ret = clk_enable(sdhci_arasan->clk_ahb);
if (ret) {
dev_err(dev, "Cannot enable AHB clock.\n");
return ret;
}
ret = clk_enable(pltfm_host->clk);
if (ret) {
dev_err(dev, "Cannot enable SD clock.\n");
clk_disable(sdhci_arasan->clk_ahb);
return ret;
}
return sdhci_resume_host(host);
}
#endif /* ! CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
sdhci_arasan_resume);
static int sdhci_arasan_probe(struct platform_device *pdev)
{
int ret;
struct clk *clk_xin;
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_arasan_data *sdhci_arasan;
sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan),
GFP_KERNEL);
if (!sdhci_arasan)
return -ENOMEM;
sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
if (IS_ERR(sdhci_arasan->clk_ahb)) {
dev_err(&pdev->dev, "clk_ahb clock not found.\n");
return PTR_ERR(sdhci_arasan->clk_ahb);
}
clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
if (IS_ERR(clk_xin)) {
dev_err(&pdev->dev, "clk_xin clock not found.\n");
return PTR_ERR(clk_xin);
}
ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
if (ret) {
dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
return ret;
}
ret = clk_prepare_enable(clk_xin);
if (ret) {
dev_err(&pdev->dev, "Unable to enable SD clock.\n");
goto clk_dis_ahb;
}
host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto clk_disable_all;
}
sdhci_get_of_property(pdev);
pltfm_host = sdhci_priv(host);
pltfm_host->priv = sdhci_arasan;
pltfm_host->clk = clk_xin;
ret = sdhci_add_host(host);
if (ret)
goto err_pltfm_free;
return 0;
err_pltfm_free:
sdhci_pltfm_free(pdev);
clk_disable_all:
clk_disable_unprepare(clk_xin);
clk_dis_ahb:
clk_disable_unprepare(sdhci_arasan->clk_ahb);
return ret;
}
static int sdhci_arasan_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
clk_disable_unprepare(pltfm_host->clk);
clk_disable_unprepare(sdhci_arasan->clk_ahb);
return sdhci_pltfm_unregister(pdev);
}
static const struct of_device_id sdhci_arasan_of_match[] = {
{ .compatible = "arasan,sdhci-8.9a" },
{ }
};
MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
static struct platform_driver sdhci_arasan_driver = {
.driver = {
.name = "sdhci-arasan",
.of_match_table = sdhci_arasan_of_match,
.pm = &sdhci_arasan_dev_pm_ops,
},
.probe = sdhci_arasan_probe,
.remove = sdhci_arasan_remove,
};
module_platform_driver(sdhci_arasan_driver);
MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
MODULE_LICENSE("GPL");
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