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 void __enable_vbus(void) 82 { 83 /* 84 * nothing to do, vbus is handled through the cpu. 85 * Define this function in board code, if it is 86 * different on your board. 87 */ 88 } 89 void enable_vbus(void) 90 __attribute__((weak, alias("__enable_vbus"))); 91 92 /* 93 * This function performs Davinci platform specific initialization for usb0. 94 */ 95 int musb_platform_init(void) 96 { 97 u32 revision; 98 99 /* enable USB VBUS */ 100 enable_vbus(); 101 102 /* start the on-chip USB phy and its pll */ 103 if (!phy_on()) 104 return -1; 105 106 /* reset the controller */ 107 dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE; 108 writel(1, &dregs->ctrlr); 109 udelay(5000); 110 111 /* Returns zero if e.g. not clocked */ 112 revision = readl(&dregs->version); 113 if (!revision) 114 return -1; 115 116 /* Disable all interrupts */ 117 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK | 118 DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr); 119 return 0; 120 } 121 122 /* 123 * This function performs Davinci platform specific deinitialization for usb0. 124 */ 125 void musb_platform_deinit(void) 126 { 127 /* Turn of the phy */ 128 phy_off(); 129 130 /* flush any interrupts */ 131 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK | 132 DAVINCI_USB_RXINT_MASK , &dregs->intclrr); 133 } 134