[U-Boot] [PATCH V2 3/3] mmc: fsl: introduce wp_enable

[Peng Fan <van.freenix@gmail.com>]

Introudce wp_enable. If want to check WPSPL, then in board code,
need to set wp_enable to 1.

Take i.MX6UL for example, to some boards, they do not use WP singal,
so they does not configure USDHC1_WP_SELECT_INPUT, and its default
value is 0(GPIO1_IO02). However GPIO1_IO02 is muxed for i2c usage and
SION bit set. So USDHC controller can always get wp signal and WPSPL
shows write protect and blocks driver continuing. This is not what
we want to see, so add wp_enable, and if set to 0, just omit the
WPSPL checking and this does not effect normal working of usdhc
controller.

To DT case, add wp_gpio, if there is wp-gpios provided in dts,
wp_enable is set to 1; if no, set to 0.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
---

V2:
 Rebased to lastest U-Boot master. Add Fabio's tested-by tag.

 drivers/mmc/fsl_esdhc.c | 21 ++++++++++++++++++---
 include/fsl_esdhc.h     |  1 +
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index d3a18c0..7ee5a24 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -91,7 +91,9 @@ struct fsl_esdhc {
  * Following is used when Driver Model is enabled for MMC
  * @dev: pointer for the device
  * @non_removable: 0: removable; 1: non-removable
+ * @wp_enable: 1: enable checking wp; 0: no check
  * @cd_gpio: gpio for card detection
+ * @wp_gpio: gpio for write protection
  */
 struct fsl_esdhc_priv {
 	struct fsl_esdhc *esdhc_regs;
@@ -101,7 +103,9 @@ struct fsl_esdhc_priv {
 	struct mmc *mmc;
 	struct udevice *dev;
 	int non_removable;
+	int wp_enable;
 	struct gpio_desc cd_gpio;
+	struct gpio_desc wp_gpio;
 };
 
 /* Return the XFERTYP flags for a given command and data packet */
@@ -245,9 +249,12 @@ static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data)
 #endif
 		if (wml_value > WML_WR_WML_MAX)
 			wml_value = WML_WR_WML_MAX_VAL;
-		if ((esdhc_read32(&regs->prsstat) & PRSSTAT_WPSPL) == 0) {
-			printf("\nThe SD card is locked. Can not write to a locked card.\n\n");
-			return TIMEOUT;
+		if (priv->wp_enable) {
+			if ((esdhc_read32(&regs->prsstat) &
+			    PRSSTAT_WPSPL) == 0) {
+				printf("\nThe SD card is locked. Can not write to a locked card.\n\n");
+				return TIMEOUT;
+			}
 		}
 
 		esdhc_clrsetbits32(&regs->wml, WML_WR_WML_MASK,
@@ -721,6 +728,7 @@ static int fsl_esdhc_cfg_to_priv(struct fsl_esdhc_cfg *cfg,
 	priv->esdhc_regs = (struct fsl_esdhc *)(unsigned long)(cfg->esdhc_base);
 	priv->bus_width = cfg->max_bus_width;
 	priv->sdhc_clk = cfg->sdhc_clk;
+	priv->wp_enable  = cfg->wp_enable;
 
 	return 0;
 };
@@ -963,6 +971,13 @@ static int fsl_esdhc_probe(struct udevice *dev)
 					   &priv->cd_gpio, GPIOD_IS_IN);
 	}
 
+	priv->wp_enable = 1;
+
+	ret = gpio_request_by_name_nodev(fdt, node, "wp-gpios", 0,
+					 &priv->wp_gpio, GPIOD_IS_IN);
+	if (ret)
+		priv->wp_enable = 0;
+
 	/*
 	 * TODO:
 	 * Because lack of clk driver, if SDHC clk is not enabled,
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
index 78c67c8..c6f4666 100644
--- a/include/fsl_esdhc.h
+++ b/include/fsl_esdhc.h
@@ -177,6 +177,7 @@ struct fsl_esdhc_cfg {
 	phys_addr_t esdhc_base;
 	u32	sdhc_clk;
 	u8	max_bus_width;
+	u8	wp_enable;
 	struct mmc_config cfg;
 };
 
-- 
2.6.2