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/*
* Allwinner SUNXI "glue layer"
*
* Copyright © 2015 Hans de Goede <hdegoede@redhat.com>
* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* Based on the sw_usb "Allwinner OTG Dual Role Controller" code.
* Copyright 2007-2012 (C) Allwinner Technology Co., Ltd.
* javen <javen@allwinnertech.com>
*
* Based on the DA8xx "glue layer" code.
* Copyright (c) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
* Copyright (C) 2005-2006 by Texas Instruments
*
* This file is part of the Inventra Controller Driver for Linux.
*
* The Inventra Controller Driver for Linux is free software; you
* can redistribute it and/or modify it under the terms of the GNU
* General Public License version 2 as published by the Free Software
* Foundation.
*
*/
#include <common.h>
#include <asm/arch/cpu.h>
#include <asm/arch/usbc.h>
#include "linux-compat.h"
#include "musb_core.h"
/******************************************************************************
******************************************************************************
* From the Allwinner driver
******************************************************************************
******************************************************************************/
/******************************************************************************
* From include/sunxi_usb_bsp.h
******************************************************************************/
/* reg offsets */
#define USBC_REG_o_ISCR 0x0400
#define USBC_REG_o_PHYCTL 0x0404
#define USBC_REG_o_PHYBIST 0x0408
#define USBC_REG_o_PHYTUNE 0x040c
#define USBC_REG_o_VEND0 0x0043
/* Interface Status and Control */
#define USBC_BP_ISCR_VBUS_VALID_FROM_DATA 30
#define USBC_BP_ISCR_VBUS_VALID_FROM_VBUS 29
#define USBC_BP_ISCR_EXT_ID_STATUS 28
#define USBC_BP_ISCR_EXT_DM_STATUS 27
#define USBC_BP_ISCR_EXT_DP_STATUS 26
#define USBC_BP_ISCR_MERGED_VBUS_STATUS 25
#define USBC_BP_ISCR_MERGED_ID_STATUS 24
#define USBC_BP_ISCR_ID_PULLUP_EN 17
#define USBC_BP_ISCR_DPDM_PULLUP_EN 16
#define USBC_BP_ISCR_FORCE_ID 14
#define USBC_BP_ISCR_FORCE_VBUS_VALID 12
#define USBC_BP_ISCR_VBUS_VALID_SRC 10
#define USBC_BP_ISCR_HOSC_EN 7
#define USBC_BP_ISCR_VBUS_CHANGE_DETECT 6
#define USBC_BP_ISCR_ID_CHANGE_DETECT 5
#define USBC_BP_ISCR_DPDM_CHANGE_DETECT 4
#define USBC_BP_ISCR_IRQ_ENABLE 3
#define USBC_BP_ISCR_VBUS_CHANGE_DETECT_EN 2
#define USBC_BP_ISCR_ID_CHANGE_DETECT_EN 1
#define USBC_BP_ISCR_DPDM_CHANGE_DETECT_EN 0
/******************************************************************************
* From usbc/usbc.c
******************************************************************************/
static u32 USBC_WakeUp_ClearChangeDetect(u32 reg_val)
{
u32 temp = reg_val;
temp &= ~(1 << USBC_BP_ISCR_VBUS_CHANGE_DETECT);
temp &= ~(1 << USBC_BP_ISCR_ID_CHANGE_DETECT);
temp &= ~(1 << USBC_BP_ISCR_DPDM_CHANGE_DETECT);
return temp;
}
static void USBC_EnableIdPullUp(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val |= (1 << USBC_BP_ISCR_ID_PULLUP_EN);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_DisableIdPullUp(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(1 << USBC_BP_ISCR_ID_PULLUP_EN);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_EnableDpDmPullUp(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val |= (1 << USBC_BP_ISCR_DPDM_PULLUP_EN);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_DisableDpDmPullUp(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(1 << USBC_BP_ISCR_DPDM_PULLUP_EN);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_ForceIdToLow(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID);
reg_val |= (0x02 << USBC_BP_ISCR_FORCE_ID);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_ForceIdToHigh(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_ID);
reg_val |= (0x03 << USBC_BP_ISCR_FORCE_ID);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_ForceVbusValidDisable(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_ForceVbusValidToHigh(__iomem void *base)
{
u32 reg_val;
reg_val = musb_readl(base, USBC_REG_o_ISCR);
reg_val &= ~(0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID);
reg_val |= (0x03 << USBC_BP_ISCR_FORCE_VBUS_VALID);
reg_val = USBC_WakeUp_ClearChangeDetect(reg_val);
musb_writel(base, USBC_REG_o_ISCR, reg_val);
}
static void USBC_ConfigFIFO_Base(void)
{
u32 reg_value;
/* config usb fifo, 8kb mode */
reg_value = readl(SUNXI_SRAMC_BASE + 0x04);
reg_value &= ~(0x03 << 0);
reg_value |= (1 << 0);
writel(reg_value, SUNXI_SRAMC_BASE + 0x04);
}
/******************************************************************************
* MUSB Glue code
******************************************************************************/
static irqreturn_t sunxi_musb_interrupt(int irq, void *__hci)
{
struct musb *musb = __hci;
irqreturn_t retval = IRQ_NONE;
/* read and flush interrupts */
musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
if (musb->int_usb)
musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
if (musb->int_tx)
musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
if (musb->int_rx)
musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
if (musb->int_usb || musb->int_tx || musb->int_rx)
retval |= musb_interrupt(musb);
return retval;
}
static void sunxi_musb_enable(struct musb *musb)
{
pr_debug("%s():\n", __func__);
/* select PIO mode */
musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0);
if (is_host_enabled(musb)) {
/* port power on */
sunxi_usbc_vbus_enable(0);
}
}
static void sunxi_musb_disable(struct musb *musb)
{
pr_debug("%s():\n", __func__);
/* Put the controller back in a pristane state for "usb reset" */
if (musb->is_active) {
sunxi_usbc_disable(0);
sunxi_usbc_enable(0);
musb->is_active = 0;
}
}
static int sunxi_musb_init(struct musb *musb)
{
int err;
pr_debug("%s():\n", __func__);
err = sunxi_usbc_request_resources(0);
if (err)
return err;
musb->isr = sunxi_musb_interrupt;
sunxi_usbc_enable(0);
USBC_ConfigFIFO_Base();
USBC_EnableDpDmPullUp(musb->mregs);
USBC_EnableIdPullUp(musb->mregs);
if (is_host_enabled(musb)) {
/* Host mode */
USBC_ForceIdToLow(musb->mregs);
USBC_ForceVbusValidToHigh(musb->mregs);
} else {
/* Peripheral mode */
USBC_ForceIdToHigh(musb->mregs);
USBC_ForceVbusValidDisable(musb->mregs);
}
return 0;
}
static int sunxi_musb_exit(struct musb *musb)
{
pr_debug("%s():\n", __func__);
USBC_DisableDpDmPullUp(musb->mregs);
USBC_DisableIdPullUp(musb->mregs);
sunxi_usbc_vbus_disable(0);
sunxi_usbc_disable(0);
return sunxi_usbc_free_resources(0);
}
const struct musb_platform_ops sunxi_musb_ops = {
.init = sunxi_musb_init,
.exit = sunxi_musb_exit,
.enable = sunxi_musb_enable,
.disable = sunxi_musb_disable,
};
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