1 /* 2 * Freescale i.MX28 USB Host driver 3 * 4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5 * on behalf of DENX Software Engineering GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <common.h> 23 #include <asm/io.h> 24 #include <asm/arch/regs-common.h> 25 #include <asm/arch/regs-base.h> 26 #include <asm/arch/regs-clkctrl-mx28.h> 27 #include <asm/arch/regs-usb.h> 28 #include <asm/arch/regs-usbphy.h> 29 30 #include "ehci-core.h" 31 #include "ehci.h" 32 33 #if (CONFIG_EHCI_MXS_PORT != 0) && (CONFIG_EHCI_MXS_PORT != 1) 34 #error "MXS EHCI: Invalid port selected!" 35 #endif 36 37 #ifndef CONFIG_EHCI_MXS_PORT 38 #error "MXS EHCI: Please define correct port using CONFIG_EHCI_MXS_PORT!" 39 #endif 40 41 static struct ehci_mxs { 42 struct mxs_usb_regs *usb_regs; 43 struct mxs_usbphy_regs *phy_regs; 44 } ehci_mxs; 45 46 int mxs_ehci_get_port(struct ehci_mxs *mxs_usb, int port) 47 { 48 uint32_t usb_base, phy_base; 49 switch (port) { 50 case 0: 51 usb_base = MXS_USBCTRL0_BASE; 52 phy_base = MXS_USBPHY0_BASE; 53 break; 54 case 1: 55 usb_base = MXS_USBCTRL1_BASE; 56 phy_base = MXS_USBPHY1_BASE; 57 break; 58 default: 59 printf("CONFIG_EHCI_MXS_PORT (port = %d)\n", port); 60 return -1; 61 } 62 63 mxs_usb->usb_regs = (struct mxs_usb_regs *)usb_base; 64 mxs_usb->phy_regs = (struct mxs_usbphy_regs *)phy_base; 65 return 0; 66 } 67 68 /* This DIGCTL register ungates clock to USB */ 69 #define HW_DIGCTL_CTRL 0x8001c000 70 #define HW_DIGCTL_CTRL_USB0_CLKGATE (1 << 2) 71 #define HW_DIGCTL_CTRL_USB1_CLKGATE (1 << 16) 72 73 int ehci_hcd_init(void) 74 { 75 76 int ret; 77 uint32_t usb_base, cap_base; 78 struct mxs_register_32 *digctl_ctrl = 79 (struct mxs_register_32 *)HW_DIGCTL_CTRL; 80 struct mxs_clkctrl_regs *clkctrl_regs = 81 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; 82 83 ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT); 84 if (ret) 85 return ret; 86 87 /* Reset the PHY block */ 88 writel(USBPHY_CTRL_SFTRST, &ehci_mxs.phy_regs->hw_usbphy_ctrl_set); 89 udelay(10); 90 writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE, 91 &ehci_mxs.phy_regs->hw_usbphy_ctrl_clr); 92 93 /* Enable USB clock */ 94 writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS | CLKCTRL_PLL0CTRL0_POWER, 95 &clkctrl_regs->hw_clkctrl_pll0ctrl0_set); 96 writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS | CLKCTRL_PLL1CTRL0_POWER, 97 &clkctrl_regs->hw_clkctrl_pll1ctrl0_set); 98 99 writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE, 100 &digctl_ctrl->reg_clr); 101 102 /* Start USB PHY */ 103 writel(0, &ehci_mxs.phy_regs->hw_usbphy_pwd); 104 105 /* Enable UTMI+ Level 2 and Level 3 compatibility */ 106 writel(USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2 | 1, 107 &ehci_mxs.phy_regs->hw_usbphy_ctrl_set); 108 109 usb_base = ((uint32_t)ehci_mxs.usb_regs) + 0x100; 110 hccr = (struct ehci_hccr *)usb_base; 111 112 cap_base = ehci_readl(&hccr->cr_capbase); 113 hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base)); 114 115 return 0; 116 } 117 118 int ehci_hcd_stop(void) 119 { 120 int ret; 121 uint32_t tmp; 122 struct mxs_register_32 *digctl_ctrl = 123 (struct mxs_register_32 *)HW_DIGCTL_CTRL; 124 struct mxs_clkctrl_regs *clkctrl_regs = 125 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; 126 127 ret = mxs_ehci_get_port(&ehci_mxs, CONFIG_EHCI_MXS_PORT); 128 if (ret) 129 return ret; 130 131 /* Stop the USB port */ 132 tmp = ehci_readl(&hcor->or_usbcmd); 133 tmp &= ~CMD_RUN; 134 ehci_writel(tmp, &hcor->or_usbcmd); 135 136 /* Disable the PHY */ 137 tmp = USBPHY_PWD_RXPWDRX | USBPHY_PWD_RXPWDDIFF | 138 USBPHY_PWD_RXPWD1PT1 | USBPHY_PWD_RXPWDENV | 139 USBPHY_PWD_TXPWDV2I | USBPHY_PWD_TXPWDIBIAS | 140 USBPHY_PWD_TXPWDFS; 141 writel(tmp, &ehci_mxs.phy_regs->hw_usbphy_pwd); 142 143 /* Disable USB clock */ 144 writel(CLKCTRL_PLL0CTRL0_EN_USB_CLKS, 145 &clkctrl_regs->hw_clkctrl_pll0ctrl0_clr); 146 writel(CLKCTRL_PLL1CTRL0_EN_USB_CLKS, 147 &clkctrl_regs->hw_clkctrl_pll1ctrl0_clr); 148 149 /* Gate off the USB clock */ 150 writel(HW_DIGCTL_CTRL_USB0_CLKGATE | HW_DIGCTL_CTRL_USB1_CLKGATE, 151 &digctl_ctrl->reg_set); 152 153 return 0; 154 } 155