| Thomas Abraham | 99a3307 | 2009-01-04 09:41:13 +0530 | [diff] [blame] | 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_usb.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 | } |