From f4f8bda2321d5ecbfeef878a50c996e3a32a75e6 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Thu, 5 Nov 2009 09:44:09 +0100 Subject: [PATCH] MXC: Add support for ULPI Viewports The ARC USB OTG Core has support for accessing ULPI tranceivers through so called ULPI viewports. Export a set of function for use with the USB OTG framework. Signed-off-by: Daniel Mack Cc: Greg Kroah-Hartman Cc: David Brownell Cc: linux-usb@vger.kernel.org Signed-off-by: Sascha Hauer --- arch/arm/plat-mxc/Kconfig | 3 + arch/arm/plat-mxc/Makefile | 1 + arch/arm/plat-mxc/include/mach/ulpi.h | 7 ++ arch/arm/plat-mxc/ulpi.c | 113 ++++++++++++++++++++++++++ 4 files changed, 124 insertions(+) create mode 100644 arch/arm/plat-mxc/include/mach/ulpi.h create mode 100644 arch/arm/plat-mxc/ulpi.c diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig index ca5c7c226341..e8e92cbd108c 100644 --- a/arch/arm/plat-mxc/Kconfig +++ b/arch/arm/plat-mxc/Kconfig @@ -69,6 +69,9 @@ config MXC_PWM help Enable support for the i.MX PWM controller(s). +config MXC_ULPI + bool + config ARCH_HAS_RNGA bool depends on ARCH_MXC diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile index e3212c8ff421..545412f81831 100644 --- a/arch/arm/plat-mxc/Makefile +++ b/arch/arm/plat-mxc/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o obj-$(CONFIG_MXC_PWM) += pwm.o +obj-$(CONFIG_MXC_ULPI) += ulpi.o diff --git a/arch/arm/plat-mxc/include/mach/ulpi.h b/arch/arm/plat-mxc/include/mach/ulpi.h new file mode 100644 index 000000000000..96b6ab4c40c3 --- /dev/null +++ b/arch/arm/plat-mxc/include/mach/ulpi.h @@ -0,0 +1,7 @@ +#ifndef __MACH_ULPI_H +#define __MACH_ULPI_H + +extern struct otg_io_access_ops mxc_ulpi_access_ops; + +#endif /* __MACH_ULPI_H */ + diff --git a/arch/arm/plat-mxc/ulpi.c b/arch/arm/plat-mxc/ulpi.c new file mode 100644 index 000000000000..582c6dfaba4a --- /dev/null +++ b/arch/arm/plat-mxc/ulpi.c @@ -0,0 +1,113 @@ +/* + * Copyright 2008 Sascha Hauer, Pengutronix + * Copyright 2009 Daniel Mack + * + * 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., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#include +#include +#include +#include +#include + +#include + +/* ULPIVIEW register bits */ +#define ULPIVW_WU (1 << 31) /* Wakeup */ +#define ULPIVW_RUN (1 << 30) /* read/write run */ +#define ULPIVW_WRITE (1 << 29) /* 0 = read 1 = write */ +#define ULPIVW_SS (1 << 27) /* SyncState */ +#define ULPIVW_PORT_MASK 0x07 /* Port field */ +#define ULPIVW_PORT_SHIFT 24 +#define ULPIVW_ADDR_MASK 0xff /* data address field */ +#define ULPIVW_ADDR_SHIFT 16 +#define ULPIVW_RDATA_MASK 0xff /* read data field */ +#define ULPIVW_RDATA_SHIFT 8 +#define ULPIVW_WDATA_MASK 0xff /* write data field */ +#define ULPIVW_WDATA_SHIFT 0 + +static int ulpi_poll(void __iomem *view, u32 bit) +{ + int timeout = 10000; + + while (timeout--) { + u32 data = __raw_readl(view); + + if (!(data & bit)) + return 0; + + cpu_relax(); + }; + + printk(KERN_WARNING "timeout polling for ULPI device\n"); + + return -ETIMEDOUT; +} + +static int ulpi_read(struct otg_transceiver *otg, u32 reg) +{ + int ret; + void __iomem *view = otg->io_priv; + + /* make sure interface is running */ + if (!(__raw_readl(view) & ULPIVW_SS)) { + __raw_writel(ULPIVW_WU, view); + + /* wait for wakeup */ + ret = ulpi_poll(view, ULPIVW_WU); + if (ret) + return ret; + } + + /* read the register */ + __raw_writel((ULPIVW_RUN | (reg << ULPIVW_ADDR_SHIFT)), view); + + /* wait for completion */ + ret = ulpi_poll(view, ULPIVW_RUN); + if (ret) + return ret; + + return (__raw_readl(view) >> ULPIVW_RDATA_SHIFT) & ULPIVW_RDATA_MASK; +} + +static int ulpi_write(struct otg_transceiver *otg, u32 val, u32 reg) +{ + int ret; + void __iomem *view = otg->io_priv; + + /* make sure the interface is running */ + if (!(__raw_readl(view) & ULPIVW_SS)) { + __raw_writel(ULPIVW_WU, view); + /* wait for wakeup */ + ret = ulpi_poll(view, ULPIVW_WU); + if (ret) + return ret; + } + + __raw_writel((ULPIVW_RUN | ULPIVW_WRITE | + (reg << ULPIVW_ADDR_SHIFT) | + ((val & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), view); + + /* wait for completion */ + return ulpi_poll(view, ULPIVW_RUN); +} + +struct otg_io_access_ops mxc_ulpi_access_ops = { + .read = ulpi_read, + .write = ulpi_write, +}; +EXPORT_SYMBOL_GPL(mxc_ulpi_access_ops); + -- 2.30.2