| Ajay Kumar Gupta | dbea324 | 2010-07-09 11:43:48 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * am35x.c - TI's AM35x platform specific usb wrapper functions. |
| 3 | * |
| 4 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> |
| 5 | * |
| 6 | * Based on drivers/usb/musb/da8xx.c |
| 7 | * |
| 8 | * Copyright (c) 2010 Texas Instruments Incorporated |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | */ |
| 24 | #include <common.h> |
| 25 | |
| 26 | #include "am35x.h" |
| 27 | |
| 28 | /* MUSB platform configuration */ |
| 29 | struct musb_config musb_cfg = { |
| 30 | .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE, |
| 31 | .timeout = AM35X_USB_OTG_TIMEOUT, |
| 32 | .musb_speed = 0, |
| 33 | }; |
| 34 | |
| 35 | /* |
| 36 | * Enable the USB phy |
| 37 | */ |
| 38 | static u8 phy_on(void) |
| 39 | { |
| 40 | u32 devconf2; |
| 41 | u32 timeout; |
| 42 | |
| 43 | devconf2 = readl(&am35x_scm_general_regs->devconf2); |
| 44 | |
| 45 | devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN | |
| 46 | DEVCONF2_OTGMODE | DEVCONF2_REFFREQ | |
| 47 | DEVCONF2_PHY_GPIOMODE); |
| 48 | devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON | |
| 49 | DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL; |
| 50 | |
| 51 | writel(devconf2, &am35x_scm_general_regs->devconf2); |
| 52 | |
| 53 | /* wait until the USB phy is turned on */ |
| 54 | timeout = musb_cfg.timeout; |
| 55 | while (timeout--) |
| 56 | if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD) |
| 57 | return 1; |
| 58 | |
| 59 | /* USB phy was not turned on */ |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Disable the USB phy |
| 65 | */ |
| 66 | static void phy_off(void) |
| 67 | { |
| 68 | u32 devconf2; |
| 69 | |
| 70 | /* |
| 71 | * Power down the on-chip PHY. |
| 72 | */ |
| 73 | devconf2 = readl(&am35x_scm_general_regs->devconf2); |
| 74 | |
| 75 | devconf2 &= ~DEVCONF2_PHY_PLLON; |
| 76 | devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN; |
| 77 | writel(devconf2, &am35x_scm_general_regs->devconf2); |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * This function performs platform specific initialization for usb0. |
| 82 | */ |
| 83 | int musb_platform_init(void) |
| 84 | { |
| 85 | u32 revision; |
| 86 | u32 sw_reset; |
| 87 | |
| 88 | /* global usb reset */ |
| 89 | sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset); |
| 90 | sw_reset |= (1 << 0); |
| 91 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); |
| 92 | sw_reset &= ~(1 << 0); |
| 93 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); |
| 94 | |
| 95 | /* reset the controller */ |
| 96 | writel(0x1, &am35x_usb_regs->control); |
| 97 | udelay(5000); |
| 98 | |
| 99 | /* start the on-chip usb phy and its pll */ |
| 100 | if (phy_on() == 0) |
| 101 | return -1; |
| 102 | |
| 103 | /* Returns zero if e.g. not clocked */ |
| 104 | revision = readl(&am35x_usb_regs->revision); |
| 105 | if (revision == 0) |
| 106 | return -1; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * This function performs platform specific deinitialization for usb0. |
| 113 | */ |
| 114 | void musb_platform_deinit(void) |
| 115 | { |
| 116 | /* Turn off the phy */ |
| 117 | phy_off(); |
| 118 | } |