1 // SPDX-License-Identifier: GPL-2.0 2 /** 3 * samsung_usb_phy.c - DesignWare USB3 (DWC3) PHY handling file 4 * 5 * Copyright (C) 2015 Samsung Electronics 6 * 7 * Author: Joonyoung Shim <jy0922.shim (at) samsung.com> 8 */ 9 10 #include <common.h> 11 #include <asm/arch/power.h> 12 #include <asm/arch/xhci-exynos.h> 13 14 void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy) 15 { 16 u32 reg; 17 18 /* Reset USB 3.0 PHY */ 19 writel(0x0, &phy->phy_reg0); 20 21 clrbits_le32(&phy->phy_param0, 22 /* Select PHY CLK source */ 23 PHYPARAM0_REF_USE_PAD | 24 /* Set Loss-of-Signal Detector sensitivity */ 25 PHYPARAM0_REF_LOSLEVEL_MASK); 26 setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL); 27 28 29 writel(0x0, &phy->phy_resume); 30 31 /* 32 * Setting the Frame length Adj value[6:1] to default 0x20 33 * See xHCI 1.0 spec, 5.2.4 34 */ 35 setbits_le32(&phy->link_system, 36 LINKSYSTEM_XHCI_VERSION_CONTROL | 37 LINKSYSTEM_FLADJ(0x20)); 38 39 /* Set Tx De-Emphasis level */ 40 clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK); 41 setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH); 42 43 setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL); 44 45 /* PHYTEST POWERDOWN Control */ 46 clrbits_le32(&phy->phy_test, 47 PHYTEST_POWERDOWN_SSP | 48 PHYTEST_POWERDOWN_HSP); 49 50 /* UTMI Power Control */ 51 writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi); 52 53 /* Use core clock from main PLL */ 54 reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK | 55 /* Default 24Mhz crystal clock */ 56 PHYCLKRST_FSEL(FSEL_CLKSEL_24M) | 57 PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF | 58 PHYCLKRST_SSC_REFCLKSEL(0) | 59 /* Force PortReset of PHY */ 60 PHYCLKRST_PORTRESET | 61 /* Digital power supply in normal operating mode */ 62 PHYCLKRST_RETENABLEN | 63 /* Enable ref clock for SS function */ 64 PHYCLKRST_REF_SSP_EN | 65 /* Enable spread spectrum */ 66 PHYCLKRST_SSC_EN | 67 /* Power down HS Bias and PLL blocks in suspend mode */ 68 PHYCLKRST_COMMONONN; 69 70 writel(reg, &phy->phy_clk_rst); 71 72 /* giving time to Phy clock to settle before resetting */ 73 udelay(10); 74 75 reg &= ~PHYCLKRST_PORTRESET; 76 writel(reg, &phy->phy_clk_rst); 77 } 78
