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 #if !defined(CONFIG_DV_USBPHY_CTL) 30 #define CONFIG_DV_USBPHY_CTL (USBPHY_SESNDEN | USBPHY_VBDTCTEN) 31 #endif 32 33 /* MUSB platform configuration */ 34 struct musb_config musb_cfg = { 35 .regs = (struct musb_regs *)MENTOR_USB0_BASE, 36 .timeout = DAVINCI_USB_TIMEOUT, 37 .musb_speed = 0, 38 }; 39 40 /* MUSB module register overlay */ 41 struct davinci_usb_regs *dregs; 42 43 /* 44 * Enable the USB phy 45 */ 46 static u8 phy_on(void) 47 { 48 u32 timeout; 49 #ifdef DAVINCI_DM365EVM 50 u32 val; 51 #endif 52 /* Wait until the USB phy is turned on */ 53 #ifdef DAVINCI_DM365EVM 54 writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN | 55 USBPHY_VBDTCTEN, USBPHY_CTL_PADDR); 56 #else 57 writel(CONFIG_DV_USBPHY_CTL, USBPHY_CTL_PADDR); 58 #endif 59 timeout = musb_cfg.timeout; 60 61 #ifdef DAVINCI_DM365EVM 62 /* Set the ownership of GIO33 to USB */ 63 val = readl(PINMUX4); 64 val &= ~(PINMUX4_USBDRVBUS_BITCLEAR); 65 val |= PINMUX4_USBDRVBUS_BITSET; 66 writel(val, PINMUX4); 67 #endif 68 while (timeout--) 69 if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD) 70 return 1; 71 72 /* USB phy was not turned on */ 73 return 0; 74 } 75 76 /* 77 * Disable the USB phy 78 */ 79 static void phy_off(void) 80 { 81 /* powerdown the on-chip PHY and its oscillator */ 82 writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR); 83 } 84 85 void __enable_vbus(void) 86 { 87 /* 88 * nothing to do, vbus is handled through the cpu. 89 * Define this function in board code, if it is 90 * different on your board. 91 */ 92 } 93 void enable_vbus(void) 94 __attribute__((weak, alias("__enable_vbus"))); 95 96 /* 97 * This function performs Davinci platform specific initialization for usb0. 98 */ 99 int musb_platform_init(void) 100 { 101 u32 revision; 102 103 /* enable USB VBUS */ 104 enable_vbus(); 105 106 /* start the on-chip USB phy and its pll */ 107 if (!phy_on()) 108 return -1; 109 110 /* reset the controller */ 111 dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE; 112 writel(1, &dregs->ctrlr); 113 udelay(5000); 114 115 /* Returns zero if e.g. not clocked */ 116 revision = readl(&dregs->version); 117 if (!revision) 118 return -1; 119 120 /* Disable all interrupts */ 121 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK | 122 DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr); 123 return 0; 124 } 125 126 /* 127 * This function performs Davinci platform specific deinitialization for usb0. 128 */ 129 void musb_platform_deinit(void) 130 { 131 /* Turn of the phy */ 132 phy_off(); 133 134 /* flush any interrupts */ 135 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK | 136 DAVINCI_USB_RXINT_MASK , &dregs->intclrr); 137 } 138