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Commit 20ea26a1 authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Ulf Hansson
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mmc: sdhci-omap: Add card_busy host ops 

Add card_busy host ops in sdhci_omap to check card busy status.

The voltage switching sequence for AM572x platform is mentioned
in Figure 25-48. eMMC/SD/SDIO Power Switching Procedure of
AM572x Sitara Processors Silicon Revision 2.0, 1.1 TRM
(SPRUHZ6I - October 2014–Revised April 2017 [1]).

In the voltage switching sequence, CLKEXTFREE bit in MMCHS_CON
should also be set after switching to 1.8v which is also taken
care in the card_busy ops.

[1] -> http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf



Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 300df508

drivers/mmc/host/sdhci-omap.c

+52 −0
Original line number Diff line number Diff line
@@ -31,11 +31,17 @@ 
#define SDHCI_OMAP_CON		0x12c

#define CON_DW8			BIT(5)

#define CON_DMA_MASTER		BIT(20)

#define CON_CLKEXTFREE		BIT(16)

#define CON_PADEN		BIT(15)

#define CON_INIT		BIT(1)

#define CON_OD			BIT(0)



#define SDHCI_OMAP_CMD		0x20c



#define SDHCI_OMAP_PSTATE	0x0224

#define PSTATE_DLEV_DAT0	BIT(20)

#define PSTATE_DATI		BIT(1)



#define SDHCI_OMAP_HCTL		0x228

#define HCTL_SDBP		BIT(8)

#define HCTL_SDVS_SHIFT		9
@@ -191,6 +197,51 @@ static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host, 
	}

}



static int sdhci_omap_card_busy(struct mmc_host *mmc)

{

	u32 reg, ac12;

	int ret = false;

	struct sdhci_host *host = mmc_priv(mmc);

	struct sdhci_pltfm_host *pltfm_host;

	struct sdhci_omap_host *omap_host;

	u32 ier = host->ier;



	pltfm_host = sdhci_priv(host);

	omap_host = sdhci_pltfm_priv(pltfm_host);



	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);

	ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);

	reg &= ~CON_CLKEXTFREE;

	if (ac12 & AC12_V1V8_SIGEN)

		reg |= CON_CLKEXTFREE;

	reg |= CON_PADEN;

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);



	disable_irq(host->irq);

	ier |= SDHCI_INT_CARD_INT;

	sdhci_writel(host, ier, SDHCI_INT_ENABLE);

	sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);



	/*

	 * Delay is required for PSTATE to correctly reflect

	 * DLEV/CLEV values after PADEN is set.

	 */

	usleep_range(50, 100);

	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);

	if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))

		ret = true;



	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);

	reg &= ~(CON_CLKEXTFREE | CON_PADEN);

	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);



	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);

	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);

	enable_irq(host->irq);



	return ret;

}



static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,

						  struct mmc_ios *ios)

{
@@ -562,6 +613,7 @@ static int sdhci_omap_probe(struct platform_device *pdev) 
	host->mmc_host_ops.start_signal_voltage_switch =

					sdhci_omap_start_signal_voltage_switch;

	host->mmc_host_ops.set_ios = sdhci_omap_set_ios;

	host->mmc_host_ops.card_busy = sdhci_omap_card_busy;



	sdhci_read_caps(host);

	host->caps |= SDHCI_CAN_DO_ADMA2;