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/*
* sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
*
* Copyright (C) 2015 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of.h>
#include "sdhci-pltfm.h"
#ifdef CONFIG_PM_SLEEP
static int sdhci_brcmstb_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
int res;
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
res = sdhci_suspend_host(host);
if (res)
return res;
clk_disable_unprepare(pltfm_host->clk);
return res;
}
static int sdhci_brcmstb_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
int err;
err = clk_prepare_enable(pltfm_host->clk);
if (err)
return err;
return sdhci_resume_host(host);
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend,
sdhci_brcmstb_resume);
static const struct sdhci_ops sdhci_brcmstb_ops = {
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
.ops = &sdhci_brcmstb_ops,
};
static int sdhci_brcmstb_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct clk *clk;
int res;
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "Clock not found in Device Tree\n");
clk = NULL;
}
res = clk_prepare_enable(clk);
if (res)
return res;
host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
if (IS_ERR(host)) {
res = PTR_ERR(host);
goto err_clk;
}
/* Enable MMC_CAP2_HC_ERASE_SZ for better max discard calculations */
host->mmc->caps2 |= MMC_CAP2_HC_ERASE_SZ;
sdhci_get_of_property(pdev);
res = mmc_of_parse(host->mmc);
if (res)
goto err;
/*
* Supply the existing CAPS, but clear the UHS modes. This
* will allow these modes to be specified by device tree
* properties through mmc_of_parse().
*/
host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
host->caps &= ~SDHCI_CAN_64BIT;
host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
SDHCI_SUPPORT_DDR50);
host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
res = sdhci_add_host(host);
if (res)
goto err;
pltfm_host = sdhci_priv(host);
pltfm_host->clk = clk;
return res;
err:
sdhci_pltfm_free(pdev);
err_clk:
clk_disable_unprepare(clk);
return res;
}
static const struct of_device_id sdhci_brcm_of_match[] = {
{ .compatible = "brcm,bcm7425-sdhci" },
{ .compatible = "brcm,bcm7445-sdhci" },
{},
};
MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
static struct platform_driver sdhci_brcmstb_driver = {
.driver = {
.name = "sdhci-brcmstb",
.pm = &sdhci_brcmstb_pmops,
.of_match_table = of_match_ptr(sdhci_brcm_of_match),
},
.probe = sdhci_brcmstb_probe,
.remove = sdhci_pltfm_unregister,
};
module_platform_driver(sdhci_brcmstb_driver);
MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
MODULE_AUTHOR("Broadcom");
MODULE_LICENSE("GPL v2");
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