1 /* 2 * TI's Davinci platform specific USB wrapper functions. 3 * 4 * Copyright (c) 2008 Texas Instruments 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 19 * MA 02111-1307 USA 20 * 21 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments 22 */ 23 24 #include <common.h> 25 #include <asm/io.h> 26 #include "davinci.h" 27 #include <asm/arch/hardware.h> 28 29 /* MUSB platform configuration */ 30 struct musb_config musb_cfg = { 31 .regs = (struct musb_regs *)MENTOR_USB0_BASE, 32 .timeout = DAVINCI_USB_TIMEOUT, 33 .musb_speed = 0, 34 }; 35 36 /* MUSB module register overlay */ 37 struct davinci_usb_regs *dregs; 38 39 /* 40 * Enable the USB phy 41 */ 42 static u8 phy_on(void) 43 { 44 u32 timeout; 45 #ifdef DAVINCI_DM365EVM 46 u32 val; 47 #endif 48 /* Wait until the USB phy is turned on */ 49 #ifdef DAVINCI_DM365EVM 50 writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN | 51 USBPHY_VBDTCTEN, USBPHY_CTL_PADDR); 52 #else 53 writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR); 54 #endif 55 timeout = musb_cfg.timeout; 56 57 #ifdef DAVINCI_DM365EVM 58 /* Set the ownership of GIO33 to USB */ 59 val = readl(PINMUX4); 60 val &= ~(PINMUX4_USBDRVBUS_BITCLEAR); 61 val |= PINMUX4_USBDRVBUS_BITSET; 62 writel(val, PINMUX4); 63 #endif 64 while (timeout--) 65 if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD) 66 return 1; 67 68 /* USB phy was not turned on */ 69 return 0; 70 } 71 72 /* 73 * Disable the USB phy 74 */ 75 static void phy_off(void) 76 { 77 /* powerdown the on-chip PHY and its oscillator */ 78 writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR); 79 } 80 81 /* 82 * This function performs Davinci platform specific initialization for usb0. 83 */ 84 int musb_platform_init(void) 85 { 86 u32 revision; 87 88 /* enable USB VBUS */ 89 #ifndef DAVINCI_DM365EVM 90 enable_vbus(); 91 #endif 92 /* start the on-chip USB phy and its pll */ 93 if (!phy_on()) 94 return -1; 95 96 /* reset the controller */ 97 dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE; 98 writel(1, &dregs->ctrlr); 99 udelay(5000); 100 101 /* Returns zero if e.g. not clocked */ 102 revision = readl(&dregs->version); 103 if (!revision) 104 return -1; 105 106 /* Disable all interrupts */ 107 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK | 108 DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr); 109 return 0; 110 } 111 112 /* 113 * This function performs Davinci platform specific deinitialization for usb0. 114 */ 115 void musb_platform_deinit(void) 116 { 117 /* Turn of the phy */ 118 phy_off(); 119 120 /* flush any interrupts */ 121 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK | 122 DAVINCI_USB_RXINT_MASK , &dregs->intclrr); 123 } 124