1// SPDX-License-Identifier: GPL-2.0 2/* 3 * OMAP ulpi viewport support 4 * Based on drivers/usb/ulpi/ulpi-viewport.c 5 * 6 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com 7 * Author: Govindraj R <govindraj.raja@ti.com> 8 */ 9 10#include <common.h> 11#include <log.h> 12#include <asm/io.h> 13#include <linux/delay.h> 14#include <usb/ulpi.h> 15 16#define OMAP_ULPI_WR_OPSEL (2 << 22) 17#define OMAP_ULPI_RD_OPSEL (3 << 22) 18#define OMAP_ULPI_START (1 << 31) 19 20/* 21 * Wait for having ulpi in done state 22 */ 23static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask) 24{ 25 int timeout = CFG_USB_ULPI_TIMEOUT; 26 27 while (--timeout) { 28 if (!(readl(ulpi_vp->viewport_addr) & mask)) 29 return 0; 30 31 udelay(1); 32 } 33 34 return ULPI_ERROR; 35} 36 37/* 38 * Issue a ULPI read/write request 39 */ 40static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value) 41{ 42 int err; 43 44 writel(value, ulpi_vp->viewport_addr); 45 46 err = ulpi_wait(ulpi_vp, OMAP_ULPI_START); 47 if (err) 48 debug("ULPI request timed out\n"); 49 50 return err; 51} 52 53int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value) 54{ 55 u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) | 56 OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff); 57 58 return ulpi_request(ulpi_vp, val); 59} 60 61u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg) 62{ 63 int err; 64 u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) | 65 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16); 66 67 err = ulpi_request(ulpi_vp, val); 68 if (err) 69 return err; 70 71 return readl(ulpi_vp->viewport_addr) & 0xff; 72} 73