| /* |
| * Copyright 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> |
| * Copyright 2009 Daniel Mack <daniel@caiaq.de> |
| * |
| * 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 <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/io.h> |
| #include <linux/delay.h> |
| #include <linux/usb/otg.h> |
| #include <linux/usb/ulpi.h> |
| |
| #include <mach/ulpi.h> |
| |
| /* 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); |
| |
| struct otg_transceiver *imx_otg_ulpi_create(unsigned int flags) |
| { |
| return otg_ulpi_create(&mxc_ulpi_access_ops, flags); |
| } |