15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 294ae9843SFelipe Balbi /* 394ae9843SFelipe Balbi * Copyright (C) 2011 Google, Inc. 494ae9843SFelipe Balbi * 594ae9843SFelipe Balbi * This software is licensed under the terms of the GNU General Public 694ae9843SFelipe Balbi * License version 2, as published by the Free Software Foundation, and 794ae9843SFelipe Balbi * may be copied, distributed, and modified under those terms. 894ae9843SFelipe Balbi * 994ae9843SFelipe Balbi * This program is distributed in the hope that it will be useful, 1094ae9843SFelipe Balbi * but WITHOUT ANY WARRANTY; without even the implied warranty of 1194ae9843SFelipe Balbi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1294ae9843SFelipe Balbi * GNU General Public License for more details. 1394ae9843SFelipe Balbi * 1494ae9843SFelipe Balbi */ 1594ae9843SFelipe Balbi 169a0e5110SManjunath Goudar #include <linux/export.h> 1794ae9843SFelipe Balbi #include <linux/kernel.h> 1894ae9843SFelipe Balbi #include <linux/usb.h> 1994ae9843SFelipe Balbi #include <linux/io.h> 2094ae9843SFelipe Balbi #include <linux/usb/otg.h> 2194ae9843SFelipe Balbi #include <linux/usb/ulpi.h> 2294ae9843SFelipe Balbi 2394ae9843SFelipe Balbi #define ULPI_VIEW_WAKEUP (1 << 31) 2494ae9843SFelipe Balbi #define ULPI_VIEW_RUN (1 << 30) 2594ae9843SFelipe Balbi #define ULPI_VIEW_WRITE (1 << 29) 2694ae9843SFelipe Balbi #define ULPI_VIEW_READ (0 << 29) 2794ae9843SFelipe Balbi #define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16) 2894ae9843SFelipe Balbi #define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff) 2994ae9843SFelipe Balbi #define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff) 3094ae9843SFelipe Balbi 3194ae9843SFelipe Balbi static int ulpi_viewport_wait(void __iomem *view, u32 mask) 3294ae9843SFelipe Balbi { 3394ae9843SFelipe Balbi unsigned long usec = 2000; 3494ae9843SFelipe Balbi 3594ae9843SFelipe Balbi while (usec--) { 3694ae9843SFelipe Balbi if (!(readl(view) & mask)) 3794ae9843SFelipe Balbi return 0; 3894ae9843SFelipe Balbi 3994ae9843SFelipe Balbi udelay(1); 402b84f92bSJoe Perches } 4194ae9843SFelipe Balbi 4294ae9843SFelipe Balbi return -ETIMEDOUT; 4394ae9843SFelipe Balbi } 4494ae9843SFelipe Balbi 4594ae9843SFelipe Balbi static int ulpi_viewport_read(struct usb_phy *otg, u32 reg) 4694ae9843SFelipe Balbi { 4794ae9843SFelipe Balbi int ret; 4894ae9843SFelipe Balbi void __iomem *view = otg->io_priv; 4994ae9843SFelipe Balbi 5094ae9843SFelipe Balbi writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); 5194ae9843SFelipe Balbi ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); 5294ae9843SFelipe Balbi if (ret) 5394ae9843SFelipe Balbi return ret; 5494ae9843SFelipe Balbi 5594ae9843SFelipe Balbi writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view); 5694ae9843SFelipe Balbi ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN); 5794ae9843SFelipe Balbi if (ret) 5894ae9843SFelipe Balbi return ret; 5994ae9843SFelipe Balbi 6094ae9843SFelipe Balbi return ULPI_VIEW_DATA_READ(readl(view)); 6194ae9843SFelipe Balbi } 6294ae9843SFelipe Balbi 6394ae9843SFelipe Balbi static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg) 6494ae9843SFelipe Balbi { 6594ae9843SFelipe Balbi int ret; 6694ae9843SFelipe Balbi void __iomem *view = otg->io_priv; 6794ae9843SFelipe Balbi 6894ae9843SFelipe Balbi writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); 6994ae9843SFelipe Balbi ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); 7094ae9843SFelipe Balbi if (ret) 7194ae9843SFelipe Balbi return ret; 7294ae9843SFelipe Balbi 7394ae9843SFelipe Balbi writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) | 7494ae9843SFelipe Balbi ULPI_VIEW_ADDR(reg), view); 7594ae9843SFelipe Balbi 7694ae9843SFelipe Balbi return ulpi_viewport_wait(view, ULPI_VIEW_RUN); 7794ae9843SFelipe Balbi } 7894ae9843SFelipe Balbi 7994ae9843SFelipe Balbi struct usb_phy_io_ops ulpi_viewport_access_ops = { 8094ae9843SFelipe Balbi .read = ulpi_viewport_read, 8194ae9843SFelipe Balbi .write = ulpi_viewport_write, 8294ae9843SFelipe Balbi }; 839a0e5110SManjunath Goudar EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops); 84