/* * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com> * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il> * * Authors: Jana Rapava <fermata7@gmail.com> * Igor Grinberg <grinberg@compulab.co.il> * * Based on: * linux/drivers/usb/otg/ulpi_viewport.c * * Original Copyright follow: * Copyright (C) 2011 Google, Inc. * * SPDX-License-Identifier: GPL-2.0 */ #include <common.h> #include <asm/io.h> #include <usb/ulpi.h> /* ULPI viewport control bits */ #define ULPI_SS (1 << 27) #define ULPI_RWCTRL (1 << 29) #define ULPI_RWRUN (1 << 30) #define ULPI_WU (1 << 31) /* * Wait for the ULPI request to complete * * @ulpi_viewport - the address of the viewport * @mask - expected value to wait for * * returns 0 on mask match, ULPI_ERROR on time out. */ static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask) { int timeout = CONFIG_USB_ULPI_TIMEOUT; /* Wait for the bits in mask to become zero. */ while (--timeout) { if ((readl(ulpi_vp->viewport_addr) & mask) == 0) return 0; udelay(1); } return ULPI_ERROR; } /* * Wake the ULPI PHY up for communication * * returns 0 on success. */ static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp) { int err; if (readl(ulpi_vp->viewport_addr) & ULPI_SS) return 0; /* already awake */ writel(ULPI_WU, ulpi_vp->viewport_addr); err = ulpi_wait(ulpi_vp, ULPI_WU); if (err) printf("ULPI wakeup timed out\n"); return err; } /* * Issue a ULPI read/write request * * @value - the ULPI request */ static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value) { int err; err = ulpi_wakeup(ulpi_vp); if (err) return err; writel(value, ulpi_vp->viewport_addr); err = ulpi_wait(ulpi_vp, ULPI_RWRUN); if (err) printf("ULPI request timed out\n"); return err; } int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value) { u32 val = ULPI_RWRUN | ULPI_RWCTRL | ((u32)reg << 16) | (value & 0xff); val |= (ulpi_vp->port_num & 0x7) << 24; return ulpi_request(ulpi_vp, val); } u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg) { int err; u32 val = ULPI_RWRUN | ((u32)reg << 16); val |= (ulpi_vp->port_num & 0x7) << 24; err = ulpi_request(ulpi_vp, val); if (err) return err; return (readl(ulpi_vp->viewport_addr) >> 8) & 0xff; }