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 28 /* MUSB platform configuration */ 29 struct musb_config musb_cfg = { 30 (struct musb_regs *)MENTOR_USB0_BASE, 31 DAVINCI_USB_TIMEOUT, 32 0 33 }; 34 35 /* MUSB module register overlay */ 36 struct davinci_usb_regs *dregs; 37 38 /* 39 * Enable the USB phy 40 */ 41 static u8 phy_on(void) 42 { 43 u32 timeout; 44 45 /* Wait until the USB phy is turned on */ 46 writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR); 47 timeout = musb_cfg.timeout; 48 while (timeout--) 49 if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD) 50 return 1; 51 52 /* USB phy was not turned on */ 53 return 0; 54 } 55 56 /* 57 * Disable the USB phy 58 */ 59 static void phy_off(void) 60 { 61 /* powerdown the on-chip PHY and its oscillator */ 62 writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR); 63 } 64 65 /* 66 * This function performs Davinci platform specific initialization for usb0. 67 */ 68 int musb_platform_init(void) 69 { 70 u32 revision; 71 72 /* enable USB VBUS */ 73 enable_vbus(); 74 75 /* start the on-chip USB phy and its pll */ 76 if (!phy_on()) 77 return -1; 78 79 /* reset the controller */ 80 dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE; 81 writel(1, &dregs->ctrlr); 82 udelay(5000); 83 84 /* Returns zero if e.g. not clocked */ 85 revision = readl(&dregs->version); 86 if (!revision) 87 return -1; 88 89 /* Disable all interrupts */ 90 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK | 91 DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr); 92 return 0; 93 } 94 95 /* 96 * This function performs Davinci platform specific deinitialization for usb0. 97 */ 98 void musb_platform_deinit(void) 99 { 100 /* Turn of the phy */ 101 phy_off(); 102 103 /* flush any interrupts */ 104 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK | 105 DAVINCI_USB_RXINT_MASK , &dregs->intclrr); 106 } 107