samsung: usb: phy: Support for DWC3 PHY
New files, namely samsung_usb_phy.c and samsung-usb-phy-uboot.h have
been added to u-boot to provide proper PHY handling at Exynos5 SoCs.
This code is used thereafter in the board_usb_init() call.
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/dwc3/samsung_usb_phy.c b/drivers/usb/dwc3/samsung_usb_phy.c
new file mode 100644
index 0000000..4220986
--- /dev/null
+++ b/drivers/usb/dwc3/samsung_usb_phy.c
@@ -0,0 +1,78 @@
+/**
+ * samsung_usb_phy.c - DesignWare USB3 (DWC3) PHY handling file
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ *
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <asm/arch/power.h>
+#include <asm/arch/xhci-exynos.h>
+
+void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
+{
+ u32 reg;
+
+ /* Reset USB 3.0 PHY */
+ writel(0x0, &phy->phy_reg0);
+
+ clrbits_le32(&phy->phy_param0,
+ /* Select PHY CLK source */
+ PHYPARAM0_REF_USE_PAD |
+ /* Set Loss-of-Signal Detector sensitivity */
+ PHYPARAM0_REF_LOSLEVEL_MASK);
+ setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
+
+
+ writel(0x0, &phy->phy_resume);
+
+ /*
+ * Setting the Frame length Adj value[6:1] to default 0x20
+ * See xHCI 1.0 spec, 5.2.4
+ */
+ setbits_le32(&phy->link_system,
+ LINKSYSTEM_XHCI_VERSION_CONTROL |
+ LINKSYSTEM_FLADJ(0x20));
+
+ /* Set Tx De-Emphasis level */
+ clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
+ setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
+
+ setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
+
+ /* PHYTEST POWERDOWN Control */
+ clrbits_le32(&phy->phy_test,
+ PHYTEST_POWERDOWN_SSP |
+ PHYTEST_POWERDOWN_HSP);
+
+ /* UTMI Power Control */
+ writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
+
+ /* Use core clock from main PLL */
+ reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
+ /* Default 24Mhz crystal clock */
+ PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
+ PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0) |
+ /* Force PortReset of PHY */
+ PHYCLKRST_PORTRESET |
+ /* Digital power supply in normal operating mode */
+ PHYCLKRST_RETENABLEN |
+ /* Enable ref clock for SS function */
+ PHYCLKRST_REF_SSP_EN |
+ /* Enable spread spectrum */
+ PHYCLKRST_SSC_EN |
+ /* Power down HS Bias and PLL blocks in suspend mode */
+ PHYCLKRST_COMMONONN;
+
+ writel(reg, &phy->phy_clk_rst);
+
+ /* giving time to Phy clock to settle before resetting */
+ udelay(10);
+
+ reg &= ~PHYCLKRST_PORTRESET;
+ writel(reg, &phy->phy_clk_rst);
+}