ARMV7: OMAP: Overo: Autodetect presence/absence of transceiver on mmc2

An upcoming version of Overo uses a Wifi/BT module with 1.8V signaling,
eliminating the need for an external transceiver to handle the level
shifting.  This patch detects whether an external transceiver is present
and adjusts the pinmux settings as appropriate.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

2 files changed, 80 insertions, 2 deletions

diff --git a/board/overo/overo.c b/board/overo/overo.c
index 4a60917201..1b67f1f502 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -103,6 +103,39 @@ int get_board_revision(void)
 }
 
 /*
+ * Routine: get_sdio2_config
+ * Description: Return information about the wifi module connection
+ *              Returns 0 if the module connects though a level translator
+ *              Returns 1 if the module connects directly
+ */
+int get_sdio2_config(void)
+{
+	int sdio_direct;
+
+	if (!omap_request_gpio(130) && !omap_request_gpio(139)) {
+
+		omap_set_gpio_direction(130, 0);
+		omap_set_gpio_direction(139, 1);
+
+		sdio_direct = 1;
+		omap_set_gpio_dataout(130, 0);
+		if (omap_get_gpio_datain(139) == 0) {
+			omap_set_gpio_dataout(130, 1);
+			if (omap_get_gpio_datain(139) == 1)
+				sdio_direct = 0;
+		}
+
+		omap_free_gpio(130);
+		omap_free_gpio(139);
+	} else {
+		printf("Error: unable to acquire sdio2 clk GPIOs\n");
+		sdio_direct = -1;
+	}
+
+	return sdio_direct;
+}
+
+/*
  * Routine: misc_init_r
  * Description: Configure board specific parts
  */
@@ -116,6 +149,20 @@ int misc_init_r(void)
 #endif
 
 	printf("Board revision: %d\n", get_board_revision());
+
+	switch (get_sdio2_config()) {
+	case 0:
+		printf("Tranceiver detected on mmc2\n");
+		MUX_OVERO_SDIO2_TRANSCEIVER();
+		break;
+	case 1:
+		printf("Direct connection on mmc2\n");
+		MUX_OVERO_SDIO2_DIRECT();
+		break;
+	default:
+		printf("Unable to detect mmc2 connection type\n");
+	}
+
 	dieid_num_r();
 
 	return 0;
diff --git a/board/overo/overo.h b/board/overo/overo.h
index 2744ffee69..33a92e4e12 100644
--- a/board/overo/overo.h
+++ b/board/overo/overo.h
@@ -211,7 +211,7 @@ const omap3_sysinfo sysinfo = {
 	MUX_VAL(CP(MMC1_DAT6),		(IEN  | PTU | EN  | M0)) /*MMC1_DAT6*/\
 	MUX_VAL(CP(MMC1_DAT7),		(IEN  | PTU | EN  | M0)) /*MMC1_DAT7*/\
  /*Wireless LAN */\
-	MUX_VAL(CP(MMC2_CLK),		(IEN  | PTU | EN  | M0)) /*MMC2_CLK*/\
+	MUX_VAL(CP(MMC2_CLK),		(IEN  | PTU | EN  | M4)) /*GPIO_130*/\
 	MUX_VAL(CP(MMC2_CMD),		(IEN  | PTU | EN  | M0)) /*MMC2_CMD*/\
 	MUX_VAL(CP(MMC2_DAT0),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT0*/\
 	MUX_VAL(CP(MMC2_DAT1),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT1*/\
@@ -220,7 +220,7 @@ const omap3_sysinfo sysinfo = {
 	MUX_VAL(CP(MMC2_DAT4),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_DAT0*/\
 	MUX_VAL(CP(MMC2_DAT5),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_DAT1*/\
 	MUX_VAL(CP(MMC2_DAT6),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_CMD*/\
-	MUX_VAL(CP(MMC2_DAT7),		(IEN  | PTU | EN  | M1)) /*MMC2_CLKIN*/\
+	MUX_VAL(CP(MMC2_DAT7),		(IEN  | PTU | EN  | M4)) /*GPIO_139*/\
  /*Bluetooth*/\
 	MUX_VAL(CP(MCBSP3_DX),		(IEN  | PTD | DIS | M1)) /*UART2_CTS*/\
 	MUX_VAL(CP(MCBSP3_DR),		(IDIS | PTD | DIS | M1)) /*UART2_RTS*/\
@@ -387,5 +387,36 @@ const omap3_sysinfo sysinfo = {
 	MUX_VAL(CP(SDRC_CKE0),		(IDIS | PTU | EN  | M0)) /*sdrc_cke0*/\
 	MUX_VAL(CP(SDRC_CKE1),		(IDIS | PTU | EN  | M0)) /*sdrc_cke1*/
 
+#define MUX_OVERO_SDIO2_DIRECT() \
+	MUX_VAL(CP(MMC2_CLK),		(IEN  | PTU | EN  | M0)) /*MMC2_CLK*/\
+	MUX_VAL(CP(MMC2_CMD),		(IEN  | PTU | EN  | M0)) /*MMC2_CMD*/\
+	MUX_VAL(CP(MMC2_DAT0),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT0*/\
+	MUX_VAL(CP(MMC2_DAT1),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT1*/\
+	MUX_VAL(CP(MMC2_DAT2),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT2*/\
+	MUX_VAL(CP(MMC2_DAT3),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT3*/\
+	MUX_VAL(CP(MMC2_DAT4),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT4*/\
+	MUX_VAL(CP(MMC2_DAT5),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT5*/\
+	MUX_VAL(CP(MMC2_DAT6),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT6*/\
+	MUX_VAL(CP(MMC2_DAT7),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT7*/\
+	MUX_VAL(CP(MMC1_DAT4),		(IEN  | PTD | EN  | M4)) /*GPIO_126*/\
+	MUX_VAL(CP(MMC1_DAT5),		(IEN  | PTU | EN  | M4)) /*GPIO_127*/\
+	MUX_VAL(CP(MMC1_DAT6),		(IEN  | PTU | EN  | M4)) /*GPIO_128*/\
+	MUX_VAL(CP(MMC1_DAT7),		(IEN  | PTU | EN  | M4)) /*GPIO_129*/
+
+#define MUX_OVERO_SDIO2_TRANSCEIVER() \
+	MUX_VAL(CP(MMC2_CLK),		(IEN  | PTU | EN  | M0)) /*MMC2_CLK*/\
+	MUX_VAL(CP(MMC2_CMD),		(IEN  | PTU | EN  | M0)) /*MMC2_CMD*/\
+	MUX_VAL(CP(MMC2_DAT0),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT0*/\
+	MUX_VAL(CP(MMC2_DAT1),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT1*/\
+	MUX_VAL(CP(MMC2_DAT2),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT2*/\
+	MUX_VAL(CP(MMC2_DAT3),		(IEN  | PTU | EN  | M0)) /*MMC2_DAT3*/\
+	MUX_VAL(CP(MMC2_DAT4),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_DAT0*/\
+	MUX_VAL(CP(MMC2_DAT5),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_DAT1*/\
+	MUX_VAL(CP(MMC2_DAT6),		(IEN  | PTU | EN  | M1)) /*MMC2_DIR_CMD*/\
+	MUX_VAL(CP(MMC2_DAT7),		(IEN  | PTU | EN  | M1)) /*MMC2_CLKIN*/\
+	MUX_VAL(CP(MMC1_DAT4),		(IEN  | PTU | EN  | M4)) /*GPIO_126*/\
+	MUX_VAL(CP(MMC1_DAT5),		(IEN  | PTU | EN  | M4)) /*GPIO_127*/\
+	MUX_VAL(CP(MMC1_DAT6),		(IEN  | PTU | EN  | M4)) /*GPIO_128*/\
+	MUX_VAL(CP(MMC1_DAT7),		(IEN  | PTU | EN  | M4)) /*GPIO_129*/
 
 #endif