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u-boot/drivers/usb/musb-new/sunxi.c
Samuel Holland 9674c09b74 musb: sunxi: Allow host-side USB with external VBUS 
Now that the PHY driver will not try to drive VBUS if it is already
driven by an external supply, there is no need to check the VBUS voltage
before powering on the PHY.

Signed-off-by: Samuel Holland <samuel@sholland.org>
2022-07-15 14:10:39 +02:00

549 lines
14 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <generic-phy.h>
#include <log.h>
#include <malloc.h>
#include <phy-sun4i-usb.h>
#include <reset.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/usb/musb.h>
#include "linux-compat.h"
#include "musb_core.h"
#include "musb_uboot.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
******************************************************************************/
#define OFF_SUN6I_AHB_RESET0 0x2c0
struct sunxi_musb_config {
struct musb_hdrc_config *config;
};
struct sunxi_glue {
struct musb_host_data mdata;
struct clk clk;
struct reset_ctl rst;
struct sunxi_musb_config *cfg;
struct device dev;
struct phy phy;
};
#define to_sunxi_glue(d) container_of(d, struct sunxi_glue, dev)
static u32 USBC_WakeUp_ClearChangeDetect(u32 reg_val)
{
u32 temp = reg_val;
temp &= ~BIT(USBC_BP_ISCR_VBUS_CHANGE_DETECT);
temp &= ~BIT(USBC_BP_ISCR_ID_CHANGE_DETECT);
temp &= ~BIT(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 |= BIT(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 |= BIT(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_ForceVbusValidToLow(__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 |= (0x02 << 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 |= BIT(0);
writel(reg_value, SUNXI_SRAMC_BASE + 0x04);
}
/******************************************************************************
* Needed for the DFU polling magic
******************************************************************************/
static u8 last_int_usb;
bool dfu_usb_get_reset(void)
{
return !!(last_int_usb & MUSB_INTR_RESET);
}
/******************************************************************************
* 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);
last_int_usb = musb->int_usb;
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;
}
/* musb_core does not call enable / disable in a balanced manner <sigh> */
static bool enabled = false;
static int sunxi_musb_enable(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
int ret;
pr_debug("%s():\n", __func__);
musb_ep_select(musb->mregs, 0);
musb_writeb(musb->mregs, MUSB_FADDR, 0);
if (enabled)
return 0;
/* select PIO mode */
musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0);
if (is_host_enabled(musb)) {
ret = sun4i_usb_phy_id_detect(&glue->phy);
if (ret == 1) {
printf("No host cable detected: ");
return -ENODEV;
}
ret = generic_phy_power_on(&glue->phy);
if (ret) {
pr_debug("failed to power on USB PHY\n");
return ret;
}
}
USBC_ForceVbusValidToHigh(musb->mregs);
enabled = true;
return 0;
}
static void sunxi_musb_disable(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
int ret;
pr_debug("%s():\n", __func__);
if (!enabled)
return;
if (is_host_enabled(musb)) {
ret = generic_phy_power_off(&glue->phy);
if (ret) {
pr_debug("failed to power off USB PHY\n");
return;
}
}
USBC_ForceVbusValidToLow(musb->mregs);
mdelay(200); /* Wait for the current session to timeout */
enabled = false;
}
static int sunxi_musb_init(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
int ret;
pr_debug("%s():\n", __func__);
ret = clk_enable(&glue->clk);
if (ret) {
dev_err(musb->controller, "failed to enable clock\n");
return ret;
}
if (reset_valid(&glue->rst)) {
ret = reset_deassert(&glue->rst);
if (ret) {
dev_err(musb->controller, "failed to deassert reset\n");
goto err_clk;
}
}
ret = generic_phy_init(&glue->phy);
if (ret) {
dev_dbg(musb->controller, "failed to init USB PHY\n");
goto err_rst;
}
musb->isr = sunxi_musb_interrupt;
USBC_ConfigFIFO_Base();
USBC_EnableDpDmPullUp(musb->mregs);
USBC_EnableIdPullUp(musb->mregs);
if (is_host_enabled(musb)) {
/* Host mode */
USBC_ForceIdToLow(musb->mregs);
} else {
/* Peripheral mode */
USBC_ForceIdToHigh(musb->mregs);
}
USBC_ForceVbusValidToHigh(musb->mregs);
return 0;
err_rst:
if (reset_valid(&glue->rst))
reset_assert(&glue->rst);
err_clk:
clk_disable(&glue->clk);
return ret;
}
static int sunxi_musb_exit(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
int ret = 0;
if (generic_phy_valid(&glue->phy)) {
ret = generic_phy_exit(&glue->phy);
if (ret) {
dev_dbg(musb->controller,
"failed to power off usb phy\n");
return ret;
}
}
if (reset_valid(&glue->rst))
reset_assert(&glue->rst);
clk_disable(&glue->clk);
return 0;
}
static void sunxi_musb_pre_root_reset_end(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
sun4i_usb_phy_set_squelch_detect(&glue->phy, false);
}
static void sunxi_musb_post_root_reset_end(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
sun4i_usb_phy_set_squelch_detect(&glue->phy, true);
}
static const struct musb_platform_ops sunxi_musb_ops = {
.init = sunxi_musb_init,
.exit = sunxi_musb_exit,
.enable = sunxi_musb_enable,
.disable = sunxi_musb_disable,
.pre_root_reset_end = sunxi_musb_pre_root_reset_end,
.post_root_reset_end = sunxi_musb_post_root_reset_end,
};
/* Allwinner OTG supports up to 5 endpoints */
#define SUNXI_MUSB_MAX_EP_NUM 6
#define SUNXI_MUSB_RAM_BITS 11
static struct musb_fifo_cfg sunxi_musb_mode_cfg[] = {
MUSB_EP_FIFO_SINGLE(1, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(1, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(2, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(2, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(3, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(3, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(4, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(4, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(5, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(5, FIFO_RX, 512),
};
/* H3/V3s OTG supports only 4 endpoints */
#define SUNXI_MUSB_MAX_EP_NUM_H3 5
static struct musb_fifo_cfg sunxi_musb_mode_cfg_h3[] = {
MUSB_EP_FIFO_SINGLE(1, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(1, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(2, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(2, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(3, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(3, FIFO_RX, 512),
MUSB_EP_FIFO_SINGLE(4, FIFO_TX, 512),
MUSB_EP_FIFO_SINGLE(4, FIFO_RX, 512),
};
static struct musb_hdrc_config musb_config = {
.fifo_cfg = sunxi_musb_mode_cfg,
.fifo_cfg_size = ARRAY_SIZE(sunxi_musb_mode_cfg),
.multipoint = true,
.dyn_fifo = true,
.num_eps = SUNXI_MUSB_MAX_EP_NUM,
.ram_bits = SUNXI_MUSB_RAM_BITS,
};
static struct musb_hdrc_config musb_config_h3 = {
.fifo_cfg = sunxi_musb_mode_cfg_h3,
.fifo_cfg_size = ARRAY_SIZE(sunxi_musb_mode_cfg_h3),
.multipoint = true,
.dyn_fifo = true,
.soft_con = true,
.num_eps = SUNXI_MUSB_MAX_EP_NUM_H3,
.ram_bits = SUNXI_MUSB_RAM_BITS,
};
static int musb_usb_probe(struct udevice *dev)
{
struct sunxi_glue *glue = dev_get_priv(dev);
struct musb_host_data *host = &glue->mdata;
struct musb_hdrc_platform_data pdata;
void *base = dev_read_addr_ptr(dev);
int ret;
#ifdef CONFIG_USB_MUSB_HOST
struct usb_bus_priv *priv = dev_get_uclass_priv(dev);
#endif
if (!base)
return -EINVAL;
glue->cfg = (struct sunxi_musb_config *)dev_get_driver_data(dev);
if (!glue->cfg)
return -EINVAL;
ret = clk_get_by_index(dev, 0, &glue->clk);
if (ret) {
dev_err(dev, "failed to get clock\n");
return ret;
}
ret = reset_get_by_index(dev, 0, &glue->rst);
if (ret && ret != -ENOENT) {
dev_err(dev, "failed to get reset\n");
return ret;
}
ret = generic_phy_get_by_name(dev, "usb", &glue->phy);
if (ret) {
pr_err("failed to get usb PHY\n");
return ret;
}
memset(&pdata, 0, sizeof(pdata));
pdata.power = 250;
pdata.platform_ops = &sunxi_musb_ops;
pdata.config = glue->cfg->config;
#ifdef CONFIG_USB_MUSB_HOST
priv->desc_before_addr = true;
pdata.mode = MUSB_HOST;
host->host = musb_init_controller(&pdata, &glue->dev, base);
if (!host->host)
return -EIO;
ret = musb_lowlevel_init(host);
if (!ret)
printf("Allwinner mUSB OTG (Host)\n");
#else
pdata.mode = MUSB_PERIPHERAL;
host->host = musb_register(&pdata, &glue->dev, base);
if (!host->host)
return -EIO;
printf("Allwinner mUSB OTG (Peripheral)\n");
#endif
return ret;
}
static int musb_usb_remove(struct udevice *dev)
{
struct sunxi_glue *glue = dev_get_priv(dev);
struct musb_host_data *host = &glue->mdata;
musb_stop(host->host);
free(host->host);
host->host = NULL;
return 0;
}
static const struct sunxi_musb_config sun4i_a10_cfg = {
.config = &musb_config,
};
static const struct sunxi_musb_config sun6i_a31_cfg = {
.config = &musb_config,
};
static const struct sunxi_musb_config sun8i_h3_cfg = {
.config = &musb_config_h3,
};
static const struct udevice_id sunxi_musb_ids[] = {
{ .compatible = "allwinner,sun4i-a10-musb",
.data = (ulong)&sun4i_a10_cfg },
{ .compatible = "allwinner,sun6i-a31-musb",
.data = (ulong)&sun6i_a31_cfg },
{ .compatible = "allwinner,sun8i-a33-musb",
.data = (ulong)&sun6i_a31_cfg },
{ .compatible = "allwinner,sun8i-h3-musb",
.data = (ulong)&sun8i_h3_cfg },
{ }
};
U_BOOT_DRIVER(usb_musb) = {
.name = "sunxi-musb",
#ifdef CONFIG_USB_MUSB_HOST
.id = UCLASS_USB,
#else
.id = UCLASS_USB_GADGET_GENERIC,
#endif
.of_match = sunxi_musb_ids,
.probe = musb_usb_probe,
.remove = musb_usb_remove,
#ifdef CONFIG_USB_MUSB_HOST
.ops = &musb_usb_ops,
#endif
.plat_auto = sizeof(struct usb_plat),
.priv_auto = sizeof(struct sunxi_glue),
};
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