[PATCH 3/6] board: ti: am62x: Add basic initialization for usb voltage, 32k crystal, debounce

[Nishanth Menon]

Do the basic configuration required for setting up the USB core voltage
configuration, setup to configure the 32k clock coming from 32k crystal
and the debounce configurations for the various pins.

Signed-off-by: Nishanth Menon <nm at ti.com>
---
 board/ti/am62x/evm.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index ad939088402e..87b1fe0a2f44 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -78,8 +78,54 @@ static int video_setup(void)
 	return 0;
 }
 
+#define CTRLMMR_USB0_PHY_CTRL	0x43004008
+#define CTRLMMR_USB1_PHY_CTRL	0x43004018
+#define CORE_VOLTAGE		0x80000000
+
+#define WKUP_CTRLMMR_DBOUNCE_CFG1 0x04504084
+#define WKUP_CTRLMMR_DBOUNCE_CFG2 0x04504088
+#define WKUP_CTRLMMR_DBOUNCE_CFG3 0x0450408c
+#define WKUP_CTRLMMR_DBOUNCE_CFG4 0x04504090
+#define WKUP_CTRLMMR_DBOUNCE_CFG5 0x04504094
+#define WKUP_CTRLMMR_DBOUNCE_CFG6 0x04504098
+
 void spl_board_init(void)
 {
+	u32 val;
+
+	/* Set USB0 PHY core voltage to 0.85V */
+	val = readl(CTRLMMR_USB0_PHY_CTRL);
+	val &= ~(CORE_VOLTAGE);
+	writel(val, CTRLMMR_USB0_PHY_CTRL);
+
+	/* Set USB1 PHY core voltage to 0.85V */
+	val = readl(CTRLMMR_USB1_PHY_CTRL);
+	val &= ~(CORE_VOLTAGE);
+	writel(val, CTRLMMR_USB1_PHY_CTRL);
+
+	/* We have 32k crystal, so lets enable it */
+	val = readl(MCU_CTRL_LFXOSC_CTRL);
+	val &= ~(MCU_CTRL_LFXOSC_32K_DISABLE_VAL);
+	writel(val, MCU_CTRL_LFXOSC_CTRL);
+	/* Add any TRIM needed for the crystal here.. */
+	/* Make sure to mux up to take the SoC 32k from the crystal */
+	writel(MCU_CTRL_DEVICE_CLKOUT_LFOSC_SELECT_VAL,
+	       MCU_CTRL_DEVICE_CLKOUT_32K_CTRL);
+
+	/* Setup debounce conf registers - arbitrary values. Times are approx */
+	/* 1.9ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG1, 0x1);
+	/* 5ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG2, 0x5);
+	/* 20ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG3, 0x14);
+	/* 46ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG4, 0x18);
+	/* 100ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG5, 0x1c);
+	/* 156ms debounce @ 32k */
+	writel(WKUP_CTRLMMR_DBOUNCE_CFG6, 0x1f);
+
 	video_setup();
 	enable_caches();
 	if (IS_ENABLED(CONFIG_SPL_SPLASH_SCREEN) && IS_ENABLED(CONFIG_SPL_BMP))
-- 
2.40.0