diff options
Diffstat (limited to 'drivers/usb/ulpi')
| -rw-r--r-- | drivers/usb/ulpi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/usb/ulpi/omap-ulpi-viewport.c | 105 |
2 files changed, 106 insertions, 0 deletions
diff --git a/drivers/usb/ulpi/Makefile b/drivers/usb/ulpi/Makefile index d43b2293e1..281eb1c5c1 100644 --- a/drivers/usb/ulpi/Makefile +++ b/drivers/usb/ulpi/Makefile @@ -24,6 +24,7 @@ LIB := $(obj)libusb_ulpi.o COBJS-$(CONFIG_USB_ULPI) += ulpi.o COBJS-$(CONFIG_USB_ULPI_VIEWPORT) += ulpi-viewport.o +COBJS-$(CONFIG_USB_ULPI_VIEWPORT_OMAP) += omap-ulpi-viewport.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/usb/ulpi/omap-ulpi-viewport.c b/drivers/usb/ulpi/omap-ulpi-viewport.c new file mode 100644 index 0000000000..3c1ea1a524 --- /dev/null +++ b/drivers/usb/ulpi/omap-ulpi-viewport.c @@ -0,0 +1,105 @@ +/* + * OMAP ulpi viewport support + * Based on drivers/usb/ulpi/ulpi-viewport.c + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com + * Author: Govindraj R <govindraj.raja@ti.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include <common.h> +#include <asm/io.h> +#include <usb/ulpi.h> + +#define OMAP_ULPI_WR_OPSEL (3 << 21) +#define OMAP_ULPI_ACCESS (1 << 31) + +/* + * Wait for the ULPI Access to complete + */ +static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask) +{ + int timeout = CONFIG_USB_ULPI_TIMEOUT; + + while (--timeout) { + if ((readl(ulpi_vp->viewport_addr) & mask)) + return 0; + + udelay(1); + } + + return ULPI_ERROR; +} + +/* + * Wake the ULPI PHY up for communication + * + * returns 0 on success. + */ +static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp) +{ + int err; + + if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS) + return 0; /* already awake */ + + writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr); + + err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS); + if (err) + debug("ULPI wakeup timed out\n"); + + return err; +} + +/* + * Issue a ULPI read/write request + */ +static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value) +{ + int err; + + err = ulpi_wakeup(ulpi_vp); + if (err) + return err; + + writel(value, ulpi_vp->viewport_addr); + + err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS); + if (err) + debug("ULPI request timed out\n"); + + return err; +} + +int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value) +{ + u32 val = ((ulpi_vp->port_num & 0xf) << 24) | + OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff); + + return ulpi_request(ulpi_vp, val); +} + +u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg) +{ + int err; + u32 val = ((ulpi_vp->port_num & 0xf) << 24) | + OMAP_ULPI_WR_OPSEL | ((u32)reg << 16); + + err = ulpi_request(ulpi_vp, val); + if (err) + return err; + + return readl(ulpi_vp->viewport_addr) & 0xff; +} |