496 lines
12 KiB
C
496 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Cadence USBSS and USBSSP DRD Driver.
|
|
*
|
|
* Copyright (C) 2018-2020 Cadence.
|
|
* Copyright (C) 2019 Texas Instruments
|
|
*
|
|
* Author: Pawel Laszczak <pawell@cadence.com>
|
|
* Roger Quadros <rogerq@ti.com>
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/iopoll.h>
|
|
#include <linux/usb/otg.h>
|
|
|
|
#include "drd.h"
|
|
#include "core.h"
|
|
|
|
/**
|
|
* cdns_set_mode - change mode of OTG Core
|
|
* @cdns: pointer to context structure
|
|
* @mode: selected mode from cdns_role
|
|
*
|
|
* Returns 0 on success otherwise negative errno
|
|
*/
|
|
static int cdns_set_mode(struct cdns *cdns, enum usb_dr_mode mode)
|
|
{
|
|
void __iomem *override_reg;
|
|
u32 reg;
|
|
|
|
switch (mode) {
|
|
case USB_DR_MODE_PERIPHERAL:
|
|
break;
|
|
case USB_DR_MODE_HOST:
|
|
break;
|
|
case USB_DR_MODE_OTG:
|
|
dev_dbg(cdns->dev, "Set controller to OTG mode\n");
|
|
|
|
if (cdns->version == CDNSP_CONTROLLER_V2)
|
|
override_reg = &cdns->otg_cdnsp_regs->override;
|
|
else if (cdns->version == CDNS3_CONTROLLER_V1)
|
|
override_reg = &cdns->otg_v1_regs->override;
|
|
else
|
|
override_reg = &cdns->otg_v0_regs->ctrl1;
|
|
|
|
reg = readl(override_reg);
|
|
|
|
if (cdns->version != CDNS3_CONTROLLER_V0)
|
|
reg |= OVERRIDE_IDPULLUP;
|
|
else
|
|
reg |= OVERRIDE_IDPULLUP_V0;
|
|
|
|
writel(reg, override_reg);
|
|
|
|
if (cdns->version == CDNS3_CONTROLLER_V1) {
|
|
/*
|
|
* Enable work around feature built into the
|
|
* controller to address issue with RX Sensitivity
|
|
* est (EL_17) for USB2 PHY. The issue only occures
|
|
* for 0x0002450D controller version.
|
|
*/
|
|
if (cdns->phyrst_a_enable) {
|
|
reg = readl(&cdns->otg_v1_regs->phyrst_cfg);
|
|
reg |= PHYRST_CFG_PHYRST_A_ENABLE;
|
|
writel(reg, &cdns->otg_v1_regs->phyrst_cfg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Hardware specification says: "ID_VALUE must be valid within
|
|
* 50ms after idpullup is set to '1" so driver must wait
|
|
* 50ms before reading this pin.
|
|
*/
|
|
usleep_range(50000, 60000);
|
|
break;
|
|
default:
|
|
dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cdns_get_id(struct cdns *cdns)
|
|
{
|
|
int id;
|
|
|
|
id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE;
|
|
dev_dbg(cdns->dev, "OTG ID: %d", id);
|
|
|
|
return id;
|
|
}
|
|
|
|
int cdns_get_vbus(struct cdns *cdns)
|
|
{
|
|
int vbus;
|
|
|
|
vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID);
|
|
dev_dbg(cdns->dev, "OTG VBUS: %d", vbus);
|
|
|
|
return vbus;
|
|
}
|
|
|
|
void cdns_clear_vbus(struct cdns *cdns)
|
|
{
|
|
u32 reg;
|
|
|
|
if (cdns->version != CDNSP_CONTROLLER_V2)
|
|
return;
|
|
|
|
reg = readl(&cdns->otg_cdnsp_regs->override);
|
|
reg |= OVERRIDE_SESS_VLD_SEL;
|
|
writel(reg, &cdns->otg_cdnsp_regs->override);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cdns_clear_vbus);
|
|
|
|
void cdns_set_vbus(struct cdns *cdns)
|
|
{
|
|
u32 reg;
|
|
|
|
if (cdns->version != CDNSP_CONTROLLER_V2)
|
|
return;
|
|
|
|
reg = readl(&cdns->otg_cdnsp_regs->override);
|
|
reg &= ~OVERRIDE_SESS_VLD_SEL;
|
|
writel(reg, &cdns->otg_cdnsp_regs->override);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cdns_set_vbus);
|
|
|
|
bool cdns_is_host(struct cdns *cdns)
|
|
{
|
|
if (cdns->dr_mode == USB_DR_MODE_HOST)
|
|
return true;
|
|
else if (cdns_get_id(cdns) == CDNS3_ID_HOST)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool cdns_is_device(struct cdns *cdns)
|
|
{
|
|
if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL)
|
|
return true;
|
|
else if (cdns->dr_mode == USB_DR_MODE_OTG)
|
|
if (cdns_get_id(cdns) == CDNS3_ID_PERIPHERAL)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* cdns_otg_disable_irq - Disable all OTG interrupts
|
|
* @cdns: Pointer to controller context structure
|
|
*/
|
|
static void cdns_otg_disable_irq(struct cdns *cdns)
|
|
{
|
|
writel(0, &cdns->otg_irq_regs->ien);
|
|
}
|
|
|
|
/**
|
|
* cdns_otg_enable_irq - enable id and sess_valid interrupts
|
|
* @cdns: Pointer to controller context structure
|
|
*/
|
|
static void cdns_otg_enable_irq(struct cdns *cdns)
|
|
{
|
|
writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT |
|
|
OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_irq_regs->ien);
|
|
}
|
|
|
|
/**
|
|
* cdns_drd_host_on - start host.
|
|
* @cdns: Pointer to controller context structure.
|
|
*
|
|
* Returns 0 on success otherwise negative errno.
|
|
*/
|
|
int cdns_drd_host_on(struct cdns *cdns)
|
|
{
|
|
u32 val, ready_bit;
|
|
int ret;
|
|
|
|
/* Enable host mode. */
|
|
writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
|
|
&cdns->otg_regs->cmd);
|
|
|
|
if (cdns->version == CDNSP_CONTROLLER_V2)
|
|
ready_bit = OTGSTS_CDNSP_XHCI_READY;
|
|
else
|
|
ready_bit = OTGSTS_CDNS3_XHCI_READY;
|
|
|
|
dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
|
|
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
|
|
val & ready_bit, 1, 100000);
|
|
|
|
if (ret)
|
|
dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
|
|
|
|
phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_HOST);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* cdns_drd_host_off - stop host.
|
|
* @cdns: Pointer to controller context structure.
|
|
*/
|
|
void cdns_drd_host_off(struct cdns *cdns)
|
|
{
|
|
u32 val;
|
|
|
|
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
|
|
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
|
|
&cdns->otg_regs->cmd);
|
|
|
|
/* Waiting till H_IDLE state.*/
|
|
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
|
|
!(val & OTGSTATE_HOST_STATE_MASK),
|
|
1, 2000000);
|
|
phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);
|
|
}
|
|
|
|
/**
|
|
* cdns_drd_gadget_on - start gadget.
|
|
* @cdns: Pointer to controller context structure.
|
|
*
|
|
* Returns 0 on success otherwise negative errno
|
|
*/
|
|
int cdns_drd_gadget_on(struct cdns *cdns)
|
|
{
|
|
u32 reg = OTGCMD_OTG_DIS;
|
|
u32 ready_bit;
|
|
int ret, val;
|
|
|
|
/* switch OTG core */
|
|
writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
|
|
|
|
dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
|
|
|
|
if (cdns->version == CDNSP_CONTROLLER_V2)
|
|
ready_bit = OTGSTS_CDNSP_DEV_READY;
|
|
else
|
|
ready_bit = OTGSTS_CDNS3_DEV_READY;
|
|
|
|
ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
|
|
val & ready_bit, 1, 100000);
|
|
if (ret) {
|
|
dev_err(cdns->dev, "timeout waiting for dev_ready\n");
|
|
return ret;
|
|
}
|
|
|
|
phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_DEVICE);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cdns_drd_gadget_on);
|
|
|
|
/**
|
|
* cdns_drd_gadget_off - stop gadget.
|
|
* @cdns: Pointer to controller context structure.
|
|
*/
|
|
void cdns_drd_gadget_off(struct cdns *cdns)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* Driver should wait at least 10us after disabling Device
|
|
* before turning-off Device (DEV_BUS_DROP).
|
|
*/
|
|
usleep_range(20, 30);
|
|
writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
|
|
OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
|
|
&cdns->otg_regs->cmd);
|
|
/* Waiting till DEV_IDLE state.*/
|
|
readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
|
|
!(val & OTGSTATE_DEV_STATE_MASK),
|
|
1, 2000000);
|
|
phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cdns_drd_gadget_off);
|
|
|
|
/**
|
|
* cdns_init_otg_mode - initialize drd controller
|
|
* @cdns: Pointer to controller context structure
|
|
*
|
|
* Returns 0 on success otherwise negative errno
|
|
*/
|
|
static int cdns_init_otg_mode(struct cdns *cdns)
|
|
{
|
|
int ret;
|
|
|
|
cdns_otg_disable_irq(cdns);
|
|
/* clear all interrupts */
|
|
writel(~0, &cdns->otg_irq_regs->ivect);
|
|
|
|
ret = cdns_set_mode(cdns, USB_DR_MODE_OTG);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cdns_otg_enable_irq(cdns);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cdns_drd_update_mode - initialize mode of operation
|
|
* @cdns: Pointer to controller context structure
|
|
*
|
|
* Returns 0 on success otherwise negative errno
|
|
*/
|
|
int cdns_drd_update_mode(struct cdns *cdns)
|
|
{
|
|
int ret;
|
|
|
|
switch (cdns->dr_mode) {
|
|
case USB_DR_MODE_PERIPHERAL:
|
|
ret = cdns_set_mode(cdns, USB_DR_MODE_PERIPHERAL);
|
|
break;
|
|
case USB_DR_MODE_HOST:
|
|
ret = cdns_set_mode(cdns, USB_DR_MODE_HOST);
|
|
break;
|
|
case USB_DR_MODE_OTG:
|
|
ret = cdns_init_otg_mode(cdns);
|
|
break;
|
|
default:
|
|
dev_err(cdns->dev, "Unsupported mode of operation %d\n",
|
|
cdns->dr_mode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t cdns_drd_thread_irq(int irq, void *data)
|
|
{
|
|
struct cdns *cdns = data;
|
|
|
|
cdns_hw_role_switch(cdns);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* cdns_drd_irq - interrupt handler for OTG events
|
|
*
|
|
* @irq: irq number for cdns core device
|
|
* @data: structure of cdns
|
|
*
|
|
* Returns IRQ_HANDLED or IRQ_NONE
|
|
*/
|
|
static irqreturn_t cdns_drd_irq(int irq, void *data)
|
|
{
|
|
irqreturn_t ret = IRQ_NONE;
|
|
struct cdns *cdns = data;
|
|
u32 reg;
|
|
|
|
if (cdns->dr_mode != USB_DR_MODE_OTG)
|
|
return IRQ_NONE;
|
|
|
|
if (cdns->in_lpm)
|
|
return ret;
|
|
|
|
reg = readl(&cdns->otg_irq_regs->ivect);
|
|
|
|
if (!reg)
|
|
return IRQ_NONE;
|
|
|
|
if (reg & OTGIEN_ID_CHANGE_INT) {
|
|
dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n",
|
|
cdns_get_id(cdns));
|
|
|
|
ret = IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
if (reg & (OTGIEN_VBUSVALID_RISE_INT | OTGIEN_VBUSVALID_FALL_INT)) {
|
|
dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n",
|
|
cdns_get_vbus(cdns));
|
|
|
|
ret = IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
writel(~0, &cdns->otg_irq_regs->ivect);
|
|
return ret;
|
|
}
|
|
|
|
int cdns_drd_init(struct cdns *cdns)
|
|
{
|
|
void __iomem *regs;
|
|
u32 state;
|
|
int ret;
|
|
|
|
regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res);
|
|
if (IS_ERR(regs))
|
|
return PTR_ERR(regs);
|
|
|
|
/* Detection of DRD version. Controller has been released
|
|
* in three versions. All are very similar and are software compatible,
|
|
* but they have same changes in register maps.
|
|
* The first register in oldest version is command register and it's
|
|
* read only. Driver should read 0 from it. On the other hand, in v1
|
|
* and v2 the first register contains device ID number which is not
|
|
* set to 0. Driver uses this fact to detect the proper version of
|
|
* controller.
|
|
*/
|
|
cdns->otg_v0_regs = regs;
|
|
if (!readl(&cdns->otg_v0_regs->cmd)) {
|
|
cdns->version = CDNS3_CONTROLLER_V0;
|
|
cdns->otg_v1_regs = NULL;
|
|
cdns->otg_cdnsp_regs = NULL;
|
|
cdns->otg_regs = regs;
|
|
cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
|
|
&cdns->otg_v0_regs->ien;
|
|
writel(1, &cdns->otg_v0_regs->simulate);
|
|
dev_dbg(cdns->dev, "DRD version v0 (%08x)\n",
|
|
readl(&cdns->otg_v0_regs->version));
|
|
} else {
|
|
cdns->otg_v0_regs = NULL;
|
|
cdns->otg_v1_regs = regs;
|
|
cdns->otg_cdnsp_regs = regs;
|
|
|
|
cdns->otg_regs = (void __iomem *)&cdns->otg_v1_regs->cmd;
|
|
|
|
if (readl(&cdns->otg_cdnsp_regs->did) == OTG_CDNSP_DID) {
|
|
cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
|
|
&cdns->otg_cdnsp_regs->ien;
|
|
cdns->version = CDNSP_CONTROLLER_V2;
|
|
} else {
|
|
cdns->otg_irq_regs = (struct cdns_otg_irq_regs __iomem *)
|
|
&cdns->otg_v1_regs->ien;
|
|
writel(1, &cdns->otg_v1_regs->simulate);
|
|
cdns->version = CDNS3_CONTROLLER_V1;
|
|
}
|
|
|
|
dev_dbg(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n",
|
|
readl(&cdns->otg_v1_regs->did),
|
|
readl(&cdns->otg_v1_regs->rid));
|
|
}
|
|
|
|
state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts));
|
|
|
|
/* Update dr_mode according to STRAP configuration. */
|
|
cdns->dr_mode = USB_DR_MODE_OTG;
|
|
|
|
if ((cdns->version == CDNSP_CONTROLLER_V2 &&
|
|
state == OTGSTS_CDNSP_STRAP_HOST) ||
|
|
(cdns->version != CDNSP_CONTROLLER_V2 &&
|
|
state == OTGSTS_STRAP_HOST)) {
|
|
dev_dbg(cdns->dev, "Controller strapped to HOST\n");
|
|
cdns->dr_mode = USB_DR_MODE_HOST;
|
|
} else if ((cdns->version == CDNSP_CONTROLLER_V2 &&
|
|
state == OTGSTS_CDNSP_STRAP_GADGET) ||
|
|
(cdns->version != CDNSP_CONTROLLER_V2 &&
|
|
state == OTGSTS_STRAP_GADGET)) {
|
|
dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n");
|
|
cdns->dr_mode = USB_DR_MODE_PERIPHERAL;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq,
|
|
cdns_drd_irq,
|
|
cdns_drd_thread_irq,
|
|
IRQF_SHARED,
|
|
dev_name(cdns->dev), cdns);
|
|
if (ret) {
|
|
dev_err(cdns->dev, "couldn't get otg_irq\n");
|
|
return ret;
|
|
}
|
|
|
|
state = readl(&cdns->otg_regs->sts);
|
|
if (OTGSTS_OTG_NRDY(state)) {
|
|
dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cdns_drd_exit(struct cdns *cdns)
|
|
{
|
|
cdns_otg_disable_irq(cdns);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Indicate the cdns3 core was power lost before */
|
|
bool cdns_power_is_lost(struct cdns *cdns)
|
|
{
|
|
if (cdns->version == CDNS3_CONTROLLER_V0) {
|
|
if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
|
|
return true;
|
|
} else {
|
|
if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cdns_power_is_lost);
|