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linux/drivers/mmc/host/sdhci-pxa.c
Philip Rakity 756515c626 mmc: sdhci-pxa: add platform code for UHS signaling 
Marvell controller requires 1.8V bit in UHS control register 2
be set when doing UHS.  eMMC does not require 1.8V for DDR.
add platform code to handle this.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Reviewed-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-05-24 23:53:57 -04:00

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/* linux/drivers/mmc/host/sdhci-pxa.c
*
* Copyright (C) 2010 Marvell International Ltd.
* Zhangfei Gao <zhangfei.gao@marvell.com>
* Kevin Wang <dwang4@marvell.com>
* Mingwei Wang <mwwang@marvell.com>
* Philip Rakity <prakity@marvell.com>
* Mark Brown <markb@marvell.com>
*
* 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.
*/
/* Supports:
* SDHCI support for MMP2/PXA910/PXA168
*
* Refer to sdhci-s3c.c.
*/
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/mmc/host.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <plat/sdhci.h>
#include "sdhci.h"
#define DRIVER_NAME "sdhci-pxa"
#define SD_FIFO_PARAM 0x104
#define DIS_PAD_SD_CLK_GATE 0x400
struct sdhci_pxa {
struct sdhci_host *host;
struct sdhci_pxa_platdata *pdata;
struct clk *clk;
struct resource *res;
u8 clk_enable;
};
/*****************************************************************************\
* *
* SDHCI core callbacks *
* *
\*****************************************************************************/
static void set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pxa *pxa = sdhci_priv(host);
u32 tmp = 0;
if (clock == 0) {
if (pxa->clk_enable) {
clk_disable(pxa->clk);
pxa->clk_enable = 0;
}
} else {
if (0 == pxa->clk_enable) {
if (pxa->pdata->flags & PXA_FLAG_DISABLE_CLOCK_GATING) {
tmp = readl(host->ioaddr + SD_FIFO_PARAM);
tmp |= DIS_PAD_SD_CLK_GATE;
writel(tmp, host->ioaddr + SD_FIFO_PARAM);
}
clk_enable(pxa->clk);
pxa->clk_enable = 1;
}
}
}
static int set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
{
u16 ctrl_2;
/*
* Set V18_EN -- UHS modes do not work without this.
* does not change signaling voltage
*/
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
switch (uhs) {
case MMC_TIMING_UHS_SDR12:
ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
break;
case MMC_TIMING_UHS_SDR25:
ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
break;
case MMC_TIMING_UHS_SDR50:
ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
break;
case MMC_TIMING_UHS_SDR104:
ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
break;
case MMC_TIMING_UHS_DDR50:
ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
break;
}
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
pr_debug("%s:%s uhs = %d, ctrl_2 = %04X\n",
__func__, mmc_hostname(host->mmc), uhs, ctrl_2);
return 0;
}
static struct sdhci_ops sdhci_pxa_ops = {
.set_uhs_signaling = set_uhs_signaling,
.set_clock = set_clock,
};
/*****************************************************************************\
* *
* Device probing/removal *
* *
\*****************************************************************************/
static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
{
struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct sdhci_host *host = NULL;
struct resource *iomem = NULL;
struct sdhci_pxa *pxa = NULL;
int ret, irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "no irq specified\n");
return irq;
}
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iomem) {
dev_err(dev, "no memory specified\n");
return -ENOENT;
}
host = sdhci_alloc_host(&pdev->dev, sizeof(struct sdhci_pxa));
if (IS_ERR(host)) {
dev_err(dev, "failed to alloc host\n");
return PTR_ERR(host);
}
pxa = sdhci_priv(host);
pxa->host = host;
pxa->pdata = pdata;
pxa->clk_enable = 0;
pxa->clk = clk_get(dev, "PXA-SDHCLK");
if (IS_ERR(pxa->clk)) {
dev_err(dev, "failed to get io clock\n");
ret = PTR_ERR(pxa->clk);
goto out;
}
pxa->res = request_mem_region(iomem->start, resource_size(iomem),
mmc_hostname(host->mmc));
if (!pxa->res) {
dev_err(&pdev->dev, "cannot request region\n");
ret = -EBUSY;
goto out;
}
host->ioaddr = ioremap(iomem->start, resource_size(iomem));
if (!host->ioaddr) {
dev_err(&pdev->dev, "failed to remap registers\n");
ret = -ENOMEM;
goto out;
}
host->hw_name = "MMC";
host->ops = &sdhci_pxa_ops;
host->irq = irq;
host->quirks = SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
if (pdata->quirks)
host->quirks |= pdata->quirks;
/* enable 1/8V DDR capable */
host->mmc->caps |= MMC_CAP_1_8V_DDR;
/* If slot design supports 8 bit data, indicate this to MMC. */
if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
host->mmc->caps |= MMC_CAP_8_BIT_DATA;
ret = sdhci_add_host(host);
if (ret) {
dev_err(&pdev->dev, "failed to add host\n");
goto out;
}
if (pxa->pdata->max_speed)
host->mmc->f_max = pxa->pdata->max_speed;
platform_set_drvdata(pdev, host);
return 0;
out:
if (host) {
clk_put(pxa->clk);
if (host->ioaddr)
iounmap(host->ioaddr);
if (pxa->res)
release_mem_region(pxa->res->start,
resource_size(pxa->res));
sdhci_free_host(host);
}
return ret;
}
static int __devexit sdhci_pxa_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pxa *pxa = sdhci_priv(host);
int dead = 0;
u32 scratch;
if (host) {
scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
if (scratch == (u32)-1)
dead = 1;
sdhci_remove_host(host, dead);
if (host->ioaddr)
iounmap(host->ioaddr);
if (pxa->res)
release_mem_region(pxa->res->start,
resource_size(pxa->res));
if (pxa->clk_enable) {
clk_disable(pxa->clk);
pxa->clk_enable = 0;
}
clk_put(pxa->clk);
sdhci_free_host(host);
platform_set_drvdata(pdev, NULL);
}
return 0;
}
#ifdef CONFIG_PM
static int sdhci_pxa_suspend(struct platform_device *dev, pm_message_t state)
{
struct sdhci_host *host = platform_get_drvdata(dev);
return sdhci_suspend_host(host, state);
}
static int sdhci_pxa_resume(struct platform_device *dev)
{
struct sdhci_host *host = platform_get_drvdata(dev);
return sdhci_resume_host(host);
}
#else
#define sdhci_pxa_suspend NULL
#define sdhci_pxa_resume NULL
#endif
static struct platform_driver sdhci_pxa_driver = {
.probe = sdhci_pxa_probe,
.remove = __devexit_p(sdhci_pxa_remove),
.suspend = sdhci_pxa_suspend,
.resume = sdhci_pxa_resume,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
static int __init sdhci_pxa_init(void)
{
return platform_driver_register(&sdhci_pxa_driver);
}
static void __exit sdhci_pxa_exit(void)
{
platform_driver_unregister(&sdhci_pxa_driver);
}
module_init(sdhci_pxa_init);
module_exit(sdhci_pxa_exit);
MODULE_DESCRIPTION("SDH controller driver for PXA168/PXA910/MMP2");
MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");
MODULE_LICENSE("GPL v2");
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