mirror of
https://github.com/brain-hackers/u-boot-brain
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52defe8f65
Sending out 5V when there is a charger connected to the otg port is not a good idea, so check for this and error out. Note this commit currently breaks otg support on the q8h tablets, as we need to do some magic with the pmic there to get vbus info, this is deliberate (better safe then sorry), fixing this is on my TODO list. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
298 lines
7.8 KiB
C
298 lines
7.8 KiB
C
/*
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* Allwinner SUNXI "glue layer"
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*
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* Copyright © 2015 Hans de Goede <hdegoede@redhat.com>
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* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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*
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* Based on the sw_usb "Allwinner OTG Dual Role Controller" code.
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* Copyright 2007-2012 (C) Allwinner Technology Co., Ltd.
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* javen <javen@allwinnertech.com>
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*
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* Based on the DA8xx "glue layer" code.
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* Copyright (c) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
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* Copyright (C) 2005-2006 by Texas Instruments
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*
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* This file is part of the Inventra Controller Driver for Linux.
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*
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* The Inventra Controller Driver for Linux is free software; you
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* can redistribute it and/or modify it under the terms of the GNU
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* General Public License version 2 as published by the Free Software
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* Foundation.
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*
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*/
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#include <common.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/usbc.h>
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#include <asm-generic/gpio.h>
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#include "linux-compat.h"
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#include "musb_core.h"
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/******************************************************************************
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******************************************************************************
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* From the Allwinner driver
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******************************************************************************
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******************************************************************************/
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/******************************************************************************
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* From include/sunxi_usb_bsp.h
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******************************************************************************/
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/* reg offsets */
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#define USBC_REG_o_ISCR 0x0400
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#define USBC_REG_o_PHYCTL 0x0404
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#define USBC_REG_o_PHYBIST 0x0408
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#define USBC_REG_o_PHYTUNE 0x040c
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#define USBC_REG_o_VEND0 0x0043
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/* Interface Status and Control */
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#define USBC_BP_ISCR_VBUS_VALID_FROM_DATA 30
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#define USBC_BP_ISCR_VBUS_VALID_FROM_VBUS 29
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#define USBC_BP_ISCR_EXT_ID_STATUS 28
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#define USBC_BP_ISCR_EXT_DM_STATUS 27
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#define USBC_BP_ISCR_EXT_DP_STATUS 26
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#define USBC_BP_ISCR_MERGED_VBUS_STATUS 25
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#define USBC_BP_ISCR_MERGED_ID_STATUS 24
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#define USBC_BP_ISCR_ID_PULLUP_EN 17
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#define USBC_BP_ISCR_DPDM_PULLUP_EN 16
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#define USBC_BP_ISCR_FORCE_ID 14
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#define USBC_BP_ISCR_FORCE_VBUS_VALID 12
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#define USBC_BP_ISCR_VBUS_VALID_SRC 10
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#define USBC_BP_ISCR_HOSC_EN 7
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#define USBC_BP_ISCR_VBUS_CHANGE_DETECT 6
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#define USBC_BP_ISCR_ID_CHANGE_DETECT 5
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#define USBC_BP_ISCR_DPDM_CHANGE_DETECT 4
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#define USBC_BP_ISCR_IRQ_ENABLE 3
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#define USBC_BP_ISCR_VBUS_CHANGE_DETECT_EN 2
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#define USBC_BP_ISCR_ID_CHANGE_DETECT_EN 1
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#define USBC_BP_ISCR_DPDM_CHANGE_DETECT_EN 0
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/******************************************************************************
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* From usbc/usbc.c
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******************************************************************************/
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static u32 USBC_WakeUp_ClearChangeDetect(u32 reg_val)
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{
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u32 temp = reg_val;
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temp &= ~(1 << USBC_BP_ISCR_VBUS_CHANGE_DETECT);
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temp &= ~(1 << USBC_BP_ISCR_ID_CHANGE_DETECT);
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temp &= ~(1 << USBC_BP_ISCR_DPDM_CHANGE_DETECT);
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return temp;
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}
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static void USBC_EnableIdPullUp(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val |= (1 << USBC_BP_ISCR_ID_PULLUP_EN);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_DisableIdPullUp(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val &= ~(1 << USBC_BP_ISCR_ID_PULLUP_EN);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_EnableDpDmPullUp(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val |= (1 << USBC_BP_ISCR_DPDM_PULLUP_EN);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_DisableDpDmPullUp(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val &= ~(1 << USBC_BP_ISCR_DPDM_PULLUP_EN);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_ForceIdToLow(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID);
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reg_val |= (0x02 << USBC_BP_ISCR_FORCE_ID);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_ForceIdToHigh(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID);
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reg_val |= (0x03 << USBC_BP_ISCR_FORCE_ID);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_ForceVbusValidToHigh(__iomem void *base)
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{
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u32 reg_val;
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reg_val = musb_readl(base, USBC_REG_o_ISCR);
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reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID);
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reg_val |= (0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID);
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reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
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musb_writel(base, USBC_REG_o_ISCR, reg_val);
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}
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static void USBC_ConfigFIFO_Base(void)
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{
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u32 reg_value;
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/* config usb fifo, 8kb mode */
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reg_value = readl(SUNXI_SRAMC_BASE + 0x04);
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reg_value &= ~(0x03 << 0);
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reg_value |= (1 << 0);
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writel(reg_value, SUNXI_SRAMC_BASE + 0x04);
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}
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/******************************************************************************
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* MUSB Glue code
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******************************************************************************/
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static irqreturn_t sunxi_musb_interrupt(int irq, void *__hci)
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{
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struct musb *musb = __hci;
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irqreturn_t retval = IRQ_NONE;
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/* read and flush interrupts */
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musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
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if (musb->int_usb)
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musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
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musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
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if (musb->int_tx)
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musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
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musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
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if (musb->int_rx)
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musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
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if (musb->int_usb || musb->int_tx || musb->int_rx)
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retval |= musb_interrupt(musb);
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return retval;
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}
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static void sunxi_musb_enable(struct musb *musb)
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{
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pr_debug("%s():\n", __func__);
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/* select PIO mode */
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musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0);
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if (is_host_enabled(musb)) {
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/* port power on */
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sunxi_usbc_vbus_enable(0);
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}
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}
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static void sunxi_musb_disable(struct musb *musb)
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{
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pr_debug("%s():\n", __func__);
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/* Put the controller back in a pristane state for "usb reset" */
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if (musb->is_active) {
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sunxi_usbc_disable(0);
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sunxi_usbc_enable(0);
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musb->is_active = 0;
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}
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}
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static int sunxi_musb_init(struct musb *musb)
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{
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int err;
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pr_debug("%s():\n", __func__);
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if (is_host_enabled(musb)) {
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int vbus_det = sunxi_name_to_gpio(CONFIG_USB0_VBUS_DET);
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if (vbus_det == -1) {
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eprintf("Error invalid Vusb-det pin\n");
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return -EINVAL;
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}
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err = gpio_request(vbus_det, "vbus0_det");
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if (err)
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return err;
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err = gpio_direction_input(vbus_det);
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if (err) {
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gpio_free(vbus_det);
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return err;
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}
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err = gpio_get_value(vbus_det);
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if (err) {
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eprintf("Error: A charger is plugged into the OTG\n");
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gpio_free(vbus_det);
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return -EIO;
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}
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gpio_free(vbus_det);
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}
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err = sunxi_usbc_request_resources(0);
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if (err)
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return err;
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musb->isr = sunxi_musb_interrupt;
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sunxi_usbc_enable(0);
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USBC_ConfigFIFO_Base();
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USBC_EnableDpDmPullUp(musb->mregs);
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USBC_EnableIdPullUp(musb->mregs);
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if (is_host_enabled(musb)) {
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/* Host mode */
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USBC_ForceIdToLow(musb->mregs);
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} else {
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/* Peripheral mode */
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USBC_ForceIdToHigh(musb->mregs);
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}
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USBC_ForceVbusValidToHigh(musb->mregs);
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return 0;
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}
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static int sunxi_musb_exit(struct musb *musb)
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{
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pr_debug("%s():\n", __func__);
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USBC_DisableDpDmPullUp(musb->mregs);
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USBC_DisableIdPullUp(musb->mregs);
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sunxi_usbc_vbus_disable(0);
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sunxi_usbc_disable(0);
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return sunxi_usbc_free_resources(0);
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}
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const struct musb_platform_ops sunxi_musb_ops = {
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.init = sunxi_musb_init,
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.exit = sunxi_musb_exit,
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.enable = sunxi_musb_enable,
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.disable = sunxi_musb_disable,
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};
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