LXR uboot/drivers/usb/dwc3/samsung_usb

   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@samsung.com>
   8 */
   9
  10#include <common.h>
  11#include <asm/arch/power.h>
  12#include <asm/arch/xhci-exynos.h>
  13#include <linux/delay.h>
  14
  15void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
  16{
  17        u32 reg;
  18
  19        /* Reset USB 3.0 PHY */
  20        writel(0x0, &phy->phy_reg0);
  21
  22        clrbits_le32(&phy->phy_param0,
  23                        /* Select PHY CLK source */
  24                        PHYPARAM0_REF_USE_PAD |
  25                        /* Set Loss-of-Signal Detector sensitivity */
  26                        PHYPARAM0_REF_LOSLEVEL_MASK);
  27        setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
  28
  29
  30        writel(0x0, &phy->phy_resume);
  31
  32        /*
  33         * Setting the Frame length Adj value[6:1] to default 0x20
  34         * See xHCI 1.0 spec, 5.2.4
  35         */
  36        setbits_le32(&phy->link_system,
  37                        LINKSYSTEM_XHCI_VERSION_CONTROL |
  38                        LINKSYSTEM_FLADJ(0x20));
  39
  40        /* Set Tx De-Emphasis level */
  41        clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
  42        setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
  43
  44        setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
  45
  46        /* PHYTEST POWERDOWN Control */
  47        clrbits_le32(&phy->phy_test,
  48                        PHYTEST_POWERDOWN_SSP |
  49                        PHYTEST_POWERDOWN_HSP);
  50
  51        /* UTMI Power Control */
  52        writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
  53
  54                /* Use core clock from main PLL */
  55        reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
  56                /* Default 24Mhz crystal clock */
  57                PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
  58                PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
  59                PHYCLKRST_SSC_REFCLKSEL(0) |
  60                /* Force PortReset of PHY */
  61                PHYCLKRST_PORTRESET |
  62                /* Digital power supply in normal operating mode */
  63                PHYCLKRST_RETENABLEN |
  64                /* Enable ref clock for SS function */
  65                PHYCLKRST_REF_SSP_EN |
  66                /* Enable spread spectrum */
  67                PHYCLKRST_SSC_EN |
  68                /* Power down HS Bias and PLL blocks in suspend mode */
  69                PHYCLKRST_COMMONONN;
  70
  71        writel(reg, &phy->phy_clk_rst);
  72
  73        /* giving time to Phy clock to settle before resetting */
  74        udelay(10);
  75
  76        reg &= ~PHYCLKRST_PORTRESET;
  77        writel(reg, &phy->phy_clk_rst);
  78}
  79