linux-kernel - [PATCH v2 11/14] mmc: mmci: Add support to data commands via variant structure.

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Date:	Thu, 15 May 2014 10:37:40 +0100
From:	srinivas.kandagatla@...aro.org
To:	Russell King <linux@....linux.org.uk>,
	Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Cc:	Chris Ball <chris@...ntf.net>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linus.walleij@...aro.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v2 11/14] mmc: mmci: Add support to data commands via variant structure.

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

On some SOCs like Qcom there are explicit bits in the command register
to specify if its a data transfer command or not. So this patch adds
support to such bits in variant data, giving more flexibility to the
driver.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/mmc/host/mmci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 0a0fc22..05ae654 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -59,6 +59,7 @@ static unsigned int fmax = 515633;
  *	      is asserted (likewise for RX)
  * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
  *		  is asserted (likewise for RX)
+ * @data_cmd_enable: enable value for data commands.
  * @sdio: variant supports SDIO
  * @st_clkdiv: true if using a ST-specific clock divider algorithm
  * @datactrl_mask_ddrmode: ddr mode mask in datactrl register.
@@ -81,6 +82,7 @@ struct variant_data {
 	unsigned int		datalength_bits;
 	unsigned int		fifosize;
 	unsigned int		fifohalfsize;
+	unsigned int		data_cmd_enable;
 	unsigned int		datactrl_mask_ddrmode;
 	bool			sdio;
 	bool			st_clkdiv;
@@ -188,6 +190,7 @@ static struct variant_data variant_qcom = {
 	.clkreg_enable		= MCI_QCOM_CLK_FLOWENA,
 	.clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
 	.datactrl_mask_ddrmode	= MCI_QCOM_CLK_DDR_MODE,
+	.data_cmd_enable	= MCI_QCOM_CSPM_DATCMD,
 	.blksz_datactrl4	= true,
 	.datalength_bits	= 24,
 	.blksz_datactrl4	= true,
@@ -874,6 +877,9 @@ mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
 	if (/*interrupt*/0)
 		c |= MCI_CPSM_INTERRUPT;
 
+	if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+		c |= host->variant->data_cmd_enable;
+
 	host->cmd = cmd;
 
 	mmci_writel(host, cmd->arg, MMCIARGUMENT);
-- 
1.9.1

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