Re: [PATCH 0/2] mmc: omap_hsmmc: support SDIO cards (#2)

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Hi Madhu,

Madhusudhan Chikkature wrote:

<snip>


You are correct!  The version of the patch in the repo indeed has
'out' in the wrong place and generates a compile error.

Could you post the patch you are using and I will try to reproduce
what you are seeing on my hardware?  Best we all work from exactly the
same patch!

Steve



Yes. I think that check breaking the compilation is not needed. How about the
below version? It just removes that check.

This version should apply fine on the latest kernel. I did a sanity test of
MMC/SD cards on OMAP4 SDP.

Steve or Mike can check if SDIO interrupts are working.


With you patch I get the same:

libertas_sdio: Libertas SDIO driver
libertas_sdio: Copyright Pierre Ossman
libertas: command 0x0003 timed out
libertas: Timeout submitting command 0x0003
libertas: PREP_CMD: command 0x0003 failed: -110
libertas_sdio: probe of mmc1:0001:1 failed with error -110
The libertas driver is expecting and interrupt from the card that signals completion of the firmware initialization. But the SDIO interrupts are disabled because every request from host to card has been completed. Moreover, if there were SDIO interrupts they would be ignored by the omap_hsmmc_do_irq handler because it returns immediately is there is not request in process.
I've tried to move the check for the SDIO interrupt to the very beginning of the ISR but to no avail.... 



Regards,
Madhu

From 08b77fd388f19f5df3758a2c59dcdec280f373c8 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@xxxxxxx>
Date: Wed, 6 Oct 2010 12:39:18 -0500
Subject: [PATCH 1/2] mmc: omap_hsmmc: enable SDIO card interrupts

Enable the use of SDIO card interrupts.

FCLK must be enabled while SDIO interrupts are enabled or the MMC
module won't wake-up (even though ENAWAKEUP in SYSCONFIG and IWE in
HTCL have been set).  Enabling the MMC module to wake-up would require
configuring the MMC module (and the mmci_dat[1] GPIO when the CORE
power domain is OFF) as wake-up sources in the PRCM.

The writes to STAT and ISE when starting a command are unnecessary and
have been removed.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxx>
---
 drivers/mmc/host/omap_hsmmc.c |   72 +++++++++++++++++++++++++++++++++++++----
 1 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 4693e62..948dd9a 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -66,6 +66,7 @@
 #define SDVS_MASK		0x00000E00
 #define SDVSCLR			0xFFFFF1FF
 #define SDVSDET			0x00000400
+#define ENAWAKEUP		(1 << 2)
 #define AUTOIDLE		0x1
 #define SDBP			(1 << 8)
 #define DTO			0xe
@@ -76,9 +77,12 @@
 #define CLKD_SHIFT		6
 #define DTO_MASK		0x000F0000
 #define DTO_SHIFT		16
+#define CIRQ_ENABLE		(1 << 8)
 #define INT_EN_MASK		0x307F0033
 #define BWR_ENABLE		(1 << 4)
 #define BRR_ENABLE		(1 << 5)
+#define CTPL			(1 << 11)
+#define CLKEXTFREE		(1 << 16)
 #define DTO_ENABLE		(1 << 20)
 #define INIT_STREAM		(1 << 1)
 #define DP_SELECT		(1 << 21)
@@ -87,10 +91,12 @@
 #define MSBS			(1 << 5)
 #define BCE			(1 << 1)
 #define FOUR_BIT		(1 << 1)
+#define IWE			(1 << 24)
 #define DW8			(1 << 5)
 #define CC			0x1
 #define TC			0x02
 #define OD			0x1
+#define CIRQ			(1 << 8)
 #define ERR			(1 << 15)
 #define CMD_TIMEOUT		(1 << 16)
 #define DATA_TIMEOUT		(1 << 20)
@@ -184,6 +190,7 @@ struct omap_hsmmc_host {
 	int			reqs_blocked;
 	int			use_reg;
 	int			req_in_progress;
+	int			sdio_int;

 	struct	omap_mmc_platform_data	*pdata;
 };
@@ -551,6 +558,9 @@ static void omap_hsmmc_enable_irq(struct omap_hsmmc_host
*host,
 	if (cmd->opcode == MMC_ERASE)
 		irq_mask &= ~DTO_ENABLE;

+	if (host->sdio_int)
+		irq_mask |= CIRQ;
+
 	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
@@ -603,7 +613,7 @@ static int omap_hsmmc_context_restore(struct
omap_hsmmc_host *host)
 		;

 	OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
-			OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
+		OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE | ENAWAKEUP);

 	if (host->id == OMAP_MMC1_DEVID) {
 		if (host->power_mode != MMC_POWER_OFF &&
@@ -618,7 +628,7 @@ static int omap_hsmmc_context_restore(struct
omap_hsmmc_host *host)
 	}

 	OMAP_HSMMC_WRITE(host->base, HCTL,
-			OMAP_HSMMC_READ(host->base, HCTL) | hctl);
+			OMAP_HSMMC_READ(host->base, HCTL) | hctl | IWE);

 	OMAP_HSMMC_WRITE(host->base, CAPA,
 			OMAP_HSMMC_READ(host->base, CAPA) | capa);
@@ -1019,6 +1029,7 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host
*host, int status)
 {
 	struct mmc_data *data;
 	int end_cmd = 0, end_trans = 0;
+	bool card_irq = false;

 	if (!host->req_in_progress) {
 		do {
@@ -1032,6 +1043,9 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host
*host, int status)
 	data = host->data;
 	dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);

+	if (status & CIRQ)
+		card_irq = true;
+
 	if (status & ERR) {
 #ifdef CONFIG_MMC_DEBUG
 		omap_hsmmc_report_irq(host, status);
@@ -1087,6 +1101,9 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host
*host, int status)
 		omap_hsmmc_cmd_done(host, host->cmd);
 	if ((end_trans || (status & TC)) && host->mrq)
 		omap_hsmmc_xfer_done(host, data);
+	if (card_irq)
+		mmc_signal_sdio_irq(host->mmc);
+
 }

 /*
@@ -1639,6 +1656,47 @@ static void omap_hsmmc_init_card(struct mmc_host *mmc,
struct mmc_card *card)
 		mmc_slot(host).init_card(card);
 }

+static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	u32 ie, con;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+
+	/*
+	 * When interrupts are enabled, CTPL must be set to enable
+	 * DAT1 input buffer (or the card interrupt is always
+	 * asserted) and FCLK must be enabled as wake-up does not
+	 * work.  Take care to disable FCLK after all the register
+	 * accesses as they might not complete if FCLK is off.
+	 *
+	 * FIXME: if the MMC module (and the mmci_dat[1] GPIO when the
+	 * CORE power domain is OFF) are configured as a wake-up
+	 * sources in the PRCM, then FCLK could be switched off.  This
+	 * might add too much latency.
+	 */
+	con = OMAP_HSMMC_READ(host->base, CON);
+	ie = OMAP_HSMMC_READ(host->base, IE);
+	if (enable) {
+		clk_enable(host->fclk);
+		ie |= CIRQ_ENABLE;
+		con |= CTPL | CLKEXTFREE;
+		host->sdio_int = 1;
+	} else {
+		ie &= ~CIRQ_ENABLE;
+		con &= ~(CTPL | CLKEXTFREE);
+		host->sdio_int = 0;
+	}
+	OMAP_HSMMC_WRITE(host->base, CON, con);
+	OMAP_HSMMC_WRITE(host->base, IE, ie);
+	OMAP_HSMMC_READ(host->base, IE); /* flush posted write */
+	if (!enable)
+		clk_disable(host->fclk);
+
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
 {
 	u32 hctl, capa, value;
@@ -1653,14 +1711,14 @@ static void omap_hsmmc_conf_bus_power(struct
omap_hsmmc_host *host)
 	}

 	value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
-	OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
+	OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl | IWE);

 	value = OMAP_HSMMC_READ(host->base, CAPA);
 	OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);

 	/* Set the controller to AUTO IDLE mode */
 	value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
-	OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
+	OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE | ENAWAKEUP);

 	/* Set SD bus power bit */
 	set_sd_bus_power(host);
@@ -1911,7 +1969,7 @@ static const struct mmc_host_ops omap_hsmmc_ops = {
 	.get_cd = omap_hsmmc_get_cd,
 	.get_ro = omap_hsmmc_get_ro,
 	.init_card = omap_hsmmc_init_card,
-	/* NYET -- enable_sdio_irq */
+	.enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
 };

 static const struct mmc_host_ops omap_hsmmc_ps_ops = {
@@ -1922,7 +1980,7 @@ static const struct mmc_host_ops omap_hsmmc_ps_ops = {
 	.get_cd = omap_hsmmc_get_cd,
 	.get_ro = omap_hsmmc_get_ro,
 	.init_card = omap_hsmmc_init_card,
-	/* NYET -- enable_sdio_irq */
+	.enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
 };

 #ifdef CONFIG_DEBUG_FS
@@ -2139,7 +2197,7 @@ static int __init omap_hsmmc_probe(struct platform_device
*pdev)
 	mmc->max_seg_size = mmc->max_req_size;

 	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
-		     MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
+		     MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE | MMC_CAP_SDIO_IRQ;

 	mmc->caps |= mmc_slot(host).caps;
 	if (mmc->caps & MMC_CAP_8_BIT_DATA)



--
Sincerely yours,
Mike.
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