diff options
author | Ajay Kumar Gupta <ajay.gupta@ti.com> | 2010-07-09 11:43:48 +0530 |
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committer | Remy Bohmer <linux@bohmer.net> | 2010-08-12 16:40:00 +0200 |
commit | dbea32420022be62116e1c49222be4d64af62c38 (patch) | |
tree | d4327e56bc84cd20947c0bf1cf9d1d3bf9d3a2a5 /drivers/usb/musb/am35x.c | |
parent | a7e9c513b61b3c0fea2bc76046f4b9470e8e2851 (diff) |
musb: MSC host support for AM35x
Tested MSC Host on AM3517EVM.
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Diffstat (limited to 'drivers/usb/musb/am35x.c')
-rw-r--r-- | drivers/usb/musb/am35x.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c new file mode 100644 index 00000000000..2024940cdd8 --- /dev/null +++ b/drivers/usb/musb/am35x.c @@ -0,0 +1,118 @@ +/* + * am35x.c - TI's AM35x platform specific usb wrapper functions. + * + * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> + * + * Based on drivers/usb/musb/da8xx.c + * + * Copyright (c) 2010 Texas Instruments Incorporated + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <common.h> + +#include "am35x.h" + +/* MUSB platform configuration */ +struct musb_config musb_cfg = { + .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE, + .timeout = AM35X_USB_OTG_TIMEOUT, + .musb_speed = 0, +}; + +/* + * Enable the USB phy + */ +static u8 phy_on(void) +{ + u32 devconf2; + u32 timeout; + + devconf2 = readl(&am35x_scm_general_regs->devconf2); + + devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN | + DEVCONF2_OTGMODE | DEVCONF2_REFFREQ | + DEVCONF2_PHY_GPIOMODE); + devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON | + DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL; + + writel(devconf2, &am35x_scm_general_regs->devconf2); + + /* wait until the USB phy is turned on */ + timeout = musb_cfg.timeout; + while (timeout--) + if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD) + return 1; + + /* USB phy was not turned on */ + return 0; +} + +/* + * Disable the USB phy + */ +static void phy_off(void) +{ + u32 devconf2; + + /* + * Power down the on-chip PHY. + */ + devconf2 = readl(&am35x_scm_general_regs->devconf2); + + devconf2 &= ~DEVCONF2_PHY_PLLON; + devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN; + writel(devconf2, &am35x_scm_general_regs->devconf2); +} + +/* + * This function performs platform specific initialization for usb0. + */ +int musb_platform_init(void) +{ + u32 revision; + u32 sw_reset; + + /* global usb reset */ + sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset); + sw_reset |= (1 << 0); + writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); + sw_reset &= ~(1 << 0); + writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); + + /* reset the controller */ + writel(0x1, &am35x_usb_regs->control); + udelay(5000); + + /* start the on-chip usb phy and its pll */ + if (phy_on() == 0) + return -1; + + /* Returns zero if e.g. not clocked */ + revision = readl(&am35x_usb_regs->revision); + if (revision == 0) + return -1; + + return 0; +} + +/* + * This function performs platform specific deinitialization for usb0. + */ +void musb_platform_deinit(void) +{ + /* Turn off the phy */ + phy_off(); +} |