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mmc: sdhci-of-arasan: Set controller to test mode when no CD bit 

The sdhci controller on xilinx zynq devices will not function unless
the CD bit is provided. http://www.xilinx.com/support/answers/61064.html
In cases where it is impossible to provide the CD bit in hardware,
setting the controller to test mode and then setting inserted to true
will get the controller to function without the CD bit.

When the device has the property xlnx,fails-without-test-cd the driver
changes the controller to test mode and sets test inserted to true to
make the controller function.

Signed-off-by: Zach Brown <zach.brown@ni.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zach Brown 2016-09-16 10:01:42 -05:00 committed by Ulf Hansson
parent ae0c12cc4e
commit 3794c54264
2 changed files with 28 additions and 1 deletions
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27
drivers/mmc/host/sdhci-of-arasan.c
View File

@ -26,6 +26,7 @@
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include "sdhci-pltfm.h"
#include <linux/of.h>
#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
@ -98,6 +99,10 @@ struct sdhci_arasan_data {
struct regmap *soc_ctl_base;
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
unsigned int quirks; /* Arasan deviations from spec */
/* Controller does not have CD wired and will not function normally without */
#define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0)
};
static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
@ -245,12 +250,27 @@ static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
}
void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
{
u8 ctrl;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
sdhci_reset(host, mask);
if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) {
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
}
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_arasan_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,
.reset = sdhci_arasan_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
@ -545,6 +565,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_arasan_data *sdhci_arasan;
struct device_node *np = pdev->dev.of_node;
host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
sizeof(*sdhci_arasan));
@ -599,6 +620,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
}
sdhci_get_of_property(pdev);
if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
pltfm_host->clk = clk_xin;
if (of_device_is_compatible(pdev->dev.of_node,

2
drivers/mmc/host/sdhci.h
View File

@ -84,6 +84,8 @@
#define SDHCI_CTRL_ADMA32 0x10
#define SDHCI_CTRL_ADMA64 0x18
#define SDHCI_CTRL_8BITBUS 0x20
#define SDHCI_CTRL_CDTEST_INS 0x40
#define SDHCI_CTRL_CDTEST_EN 0x80
#define SDHCI_POWER_CONTROL 0x29
#define SDHCI_POWER_ON 0x01