| /* |
| * Copyright 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.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 <common.h> |
| #include <asm/io.h> |
| #include <errno.h> |
| #include <usb/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, uint32_t bit) |
| { |
| uint32_t data; |
| int timeout = 10000; |
| |
| data = readl(view); |
| while (data & bit) { |
| if (!timeout--) |
| return -ETIMEDOUT; |
| |
| udelay(1); |
| data = readl(view); |
| } |
| return (data >> ULPIVW_RDATA_SHIFT) & ULPIVW_RDATA_MASK; |
| } |
| |
| int ulpi_read(int reg, void __iomem *view) |
| { |
| int ret; |
| |
| /* make sure interface is running */ |
| if (!(readl(view) && ULPIVW_SS)) { |
| writel(ULPIVW_WU, view); |
| |
| /* wait for wakeup */ |
| ret = ulpi_poll(view, ULPIVW_WU); |
| if (ret < 0) |
| return ret; |
| } |
| |
| /* read the register */ |
| writel((ULPIVW_RUN | (reg << ULPIVW_ADDR_SHIFT)), view); |
| |
| /* wait for completion */ |
| return ulpi_poll(view, ULPIVW_RUN); |
| } |
| EXPORT_SYMBOL(ulpi_read); |
| |
| int ulpi_set(u8 bits, int reg, void __iomem *view) |
| { |
| int ret; |
| |
| /* make sure the interface is running */ |
| if (!(readl(view) && ULPIVW_SS)) { |
| writel(ULPIVW_WU, view); |
| /* wait for wakeup */ |
| ret = ulpi_poll(view, ULPIVW_WU); |
| if (ret < 0) |
| return ret; |
| } |
| |
| writel((ULPIVW_RUN | ULPIVW_WRITE | |
| ((reg + ISP1504_REG_SET) << ULPIVW_ADDR_SHIFT) | |
| ((bits & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), |
| view); |
| |
| /* wait for completion */ |
| ret = ulpi_poll(view, ULPIVW_RUN); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| EXPORT_SYMBOL(ulpi_set); |
| |
| int ulpi_clear(u8 bits, int reg, void __iomem *view) |
| { |
| int ret; |
| |
| writel((ULPIVW_RUN | ULPIVW_WRITE | |
| ((reg + ISP1504_REG_CLEAR) << ULPIVW_ADDR_SHIFT) | |
| ((bits & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), |
| view); |
| |
| /* wait for completion */ |
| ret = ulpi_poll(view, ULPIVW_RUN); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| EXPORT_SYMBOL(ulpi_clear); |
| |