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linux-zen-server/drivers/usb/chipidea/core.c

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2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* core.c - ChipIdea USB IP core family device controller
*
* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2020 NXP
*
* Author: David Lopo
* Peter Chen <peter.chen@nxp.com>
*
* Main Features:
* - Four transfers are supported, usbtest is passed
* - USB Certification for gadget: CH9 and Mass Storage are passed
* - Low power mode
* - USB wakeup
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/extcon.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/usb/chipidea.h>
#include <linux/usb/of.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/usb/ehci_def.h>
#include "ci.h"
#include "udc.h"
#include "bits.h"
#include "host.h"
#include "otg.h"
#include "otg_fsm.h"
/* Controller register map */
static const u8 ci_regs_nolpm[] = {
[CAP_CAPLENGTH] = 0x00U,
[CAP_HCCPARAMS] = 0x08U,
[CAP_DCCPARAMS] = 0x24U,
[CAP_TESTMODE] = 0x38U,
[OP_USBCMD] = 0x00U,
[OP_USBSTS] = 0x04U,
[OP_USBINTR] = 0x08U,
[OP_FRINDEX] = 0x0CU,
[OP_DEVICEADDR] = 0x14U,
[OP_ENDPTLISTADDR] = 0x18U,
[OP_TTCTRL] = 0x1CU,
[OP_BURSTSIZE] = 0x20U,
[OP_ULPI_VIEWPORT] = 0x30U,
[OP_PORTSC] = 0x44U,
[OP_DEVLC] = 0x84U,
[OP_OTGSC] = 0x64U,
[OP_USBMODE] = 0x68U,
[OP_ENDPTSETUPSTAT] = 0x6CU,
[OP_ENDPTPRIME] = 0x70U,
[OP_ENDPTFLUSH] = 0x74U,
[OP_ENDPTSTAT] = 0x78U,
[OP_ENDPTCOMPLETE] = 0x7CU,
[OP_ENDPTCTRL] = 0x80U,
};
static const u8 ci_regs_lpm[] = {
[CAP_CAPLENGTH] = 0x00U,
[CAP_HCCPARAMS] = 0x08U,
[CAP_DCCPARAMS] = 0x24U,
[CAP_TESTMODE] = 0xFCU,
[OP_USBCMD] = 0x00U,
[OP_USBSTS] = 0x04U,
[OP_USBINTR] = 0x08U,
[OP_FRINDEX] = 0x0CU,
[OP_DEVICEADDR] = 0x14U,
[OP_ENDPTLISTADDR] = 0x18U,
[OP_TTCTRL] = 0x1CU,
[OP_BURSTSIZE] = 0x20U,
[OP_ULPI_VIEWPORT] = 0x30U,
[OP_PORTSC] = 0x44U,
[OP_DEVLC] = 0x84U,
[OP_OTGSC] = 0xC4U,
[OP_USBMODE] = 0xC8U,
[OP_ENDPTSETUPSTAT] = 0xD8U,
[OP_ENDPTPRIME] = 0xDCU,
[OP_ENDPTFLUSH] = 0xE0U,
[OP_ENDPTSTAT] = 0xE4U,
[OP_ENDPTCOMPLETE] = 0xE8U,
[OP_ENDPTCTRL] = 0xECU,
};
static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
{
int i;
for (i = 0; i < OP_ENDPTCTRL; i++)
ci->hw_bank.regmap[i] =
(i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
(is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
for (; i <= OP_LAST; i++)
ci->hw_bank.regmap[i] = ci->hw_bank.op +
4 * (i - OP_ENDPTCTRL) +
(is_lpm
? ci_regs_lpm[OP_ENDPTCTRL]
: ci_regs_nolpm[OP_ENDPTCTRL]);
}
static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
{
int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
enum ci_revision rev = CI_REVISION_UNKNOWN;
if (ver == 0x2) {
rev = hw_read_id_reg(ci, ID_ID, REVISION)
>> __ffs(REVISION);
rev += CI_REVISION_20;
} else if (ver == 0x0) {
rev = CI_REVISION_1X;
}
return rev;
}
/**
* hw_read_intr_enable: returns interrupt enable register
*
* @ci: the controller
*
* This function returns register data
*/
u32 hw_read_intr_enable(struct ci_hdrc *ci)
{
return hw_read(ci, OP_USBINTR, ~0);
}
/**
* hw_read_intr_status: returns interrupt status register
*
* @ci: the controller
*
* This function returns register data
*/
u32 hw_read_intr_status(struct ci_hdrc *ci)
{
return hw_read(ci, OP_USBSTS, ~0);
}
/**
* hw_port_test_set: writes port test mode (execute without interruption)
* @ci: the controller
* @mode: new value
*
* This function returns an error code
*/
int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
{
const u8 TEST_MODE_MAX = 7;
if (mode > TEST_MODE_MAX)
return -EINVAL;
hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
return 0;
}
/**
* hw_port_test_get: reads port test mode value
*
* @ci: the controller
*
* This function returns port test mode value
*/
u8 hw_port_test_get(struct ci_hdrc *ci)
{
return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
}
static void hw_wait_phy_stable(void)
{
/*
* The phy needs some delay to output the stable status from low
* power mode. And for OTGSC, the status inputs are debounced
* using a 1 ms time constant, so, delay 2ms for controller to get
* the stable status, like vbus and id when the phy leaves low power.
*/
usleep_range(2000, 2500);
}
/* The PHY enters/leaves low power mode */
static void ci_hdrc_enter_lpm_common(struct ci_hdrc *ci, bool enable)
{
enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
if (enable && !lpm)
hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
PORTSC_PHCD(ci->hw_bank.lpm));
else if (!enable && lpm)
hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
0);
}
static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
{
return ci->platdata->enter_lpm(ci, enable);
}
static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
{
u32 reg;
/* bank is a module variable */
ci->hw_bank.abs = base;
ci->hw_bank.cap = ci->hw_bank.abs;
ci->hw_bank.cap += ci->platdata->capoffset;
ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
hw_alloc_regmap(ci, false);
reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
__ffs(HCCPARAMS_LEN);
ci->hw_bank.lpm = reg;
if (reg)
hw_alloc_regmap(ci, !!reg);
ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
ci->hw_bank.size += OP_LAST;
ci->hw_bank.size /= sizeof(u32);
reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
__ffs(DCCPARAMS_DEN);
ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
if (ci->hw_ep_max > ENDPT_MAX)
return -ENODEV;
ci_hdrc_enter_lpm(ci, false);
/* Disable all interrupts bits */
hw_write(ci, OP_USBINTR, 0xffffffff, 0);
/* Clear all interrupts status bits*/
hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
ci->rev = ci_get_revision(ci);
dev_dbg(ci->dev,
"revision: %d, lpm: %d; cap: %px op: %px\n",
ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
/* setup lock mode ? */
/* ENDPTSETUPSTAT is '0' by default */
/* HCSPARAMS.bf.ppc SHOULD BE zero for device */
return 0;
}
void hw_phymode_configure(struct ci_hdrc *ci)
{
u32 portsc, lpm, sts = 0;
switch (ci->platdata->phy_mode) {
case USBPHY_INTERFACE_MODE_UTMI:
portsc = PORTSC_PTS(PTS_UTMI);
lpm = DEVLC_PTS(PTS_UTMI);
break;
case USBPHY_INTERFACE_MODE_UTMIW:
portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
break;
case USBPHY_INTERFACE_MODE_ULPI:
portsc = PORTSC_PTS(PTS_ULPI);
lpm = DEVLC_PTS(PTS_ULPI);
break;
case USBPHY_INTERFACE_MODE_SERIAL:
portsc = PORTSC_PTS(PTS_SERIAL);
lpm = DEVLC_PTS(PTS_SERIAL);
sts = 1;
break;
case USBPHY_INTERFACE_MODE_HSIC:
portsc = PORTSC_PTS(PTS_HSIC);
lpm = DEVLC_PTS(PTS_HSIC);
break;
default:
return;
}
if (ci->hw_bank.lpm) {
hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
if (sts)
hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
} else {
hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
if (sts)
hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
}
}
EXPORT_SYMBOL_GPL(hw_phymode_configure);
/**
* _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
* interfaces
* @ci: the controller
*
* This function returns an error code if the phy failed to init
*/
static int _ci_usb_phy_init(struct ci_hdrc *ci)
{
int ret;
if (ci->phy) {
ret = phy_init(ci->phy);
if (ret)
return ret;
ret = phy_power_on(ci->phy);
if (ret) {
phy_exit(ci->phy);
return ret;
}
} else {
ret = usb_phy_init(ci->usb_phy);
}
return ret;
}
/**
* ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
* interfaces
* @ci: the controller
*/
static void ci_usb_phy_exit(struct ci_hdrc *ci)
{
if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
return;
if (ci->phy) {
phy_power_off(ci->phy);
phy_exit(ci->phy);
} else {
usb_phy_shutdown(ci->usb_phy);
}
}
/**
* ci_usb_phy_init: initialize phy according to different phy type
* @ci: the controller
*
* This function returns an error code if usb_phy_init has failed
*/
static int ci_usb_phy_init(struct ci_hdrc *ci)
{
int ret;
if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
return 0;
switch (ci->platdata->phy_mode) {
case USBPHY_INTERFACE_MODE_UTMI:
case USBPHY_INTERFACE_MODE_UTMIW:
case USBPHY_INTERFACE_MODE_HSIC:
ret = _ci_usb_phy_init(ci);
if (!ret)
hw_wait_phy_stable();
else
return ret;
hw_phymode_configure(ci);
break;
case USBPHY_INTERFACE_MODE_ULPI:
case USBPHY_INTERFACE_MODE_SERIAL:
hw_phymode_configure(ci);
ret = _ci_usb_phy_init(ci);
if (ret)
return ret;
break;
default:
ret = _ci_usb_phy_init(ci);
if (!ret)
hw_wait_phy_stable();
}
return ret;
}
/**
* ci_platform_configure: do controller configure
* @ci: the controller
*
*/
void ci_platform_configure(struct ci_hdrc *ci)
{
bool is_device_mode, is_host_mode;
is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
if (is_device_mode) {
phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
USBMODE_CI_SDIS);
}
if (is_host_mode) {
phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
USBMODE_CI_SDIS);
}
if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
if (ci->hw_bank.lpm)
hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
else
hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
}
if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
ci->platdata->ahb_burst_config);
/* override burst size, take effect only when ahb_burst_config is 0 */
if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
ci->platdata->rx_burst_size);
}
}
/**
* hw_controller_reset: do controller reset
* @ci: the controller
*
* This function returns an error code
*/
static int hw_controller_reset(struct ci_hdrc *ci)
{
int count = 0;
hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
udelay(10);
if (count++ > 1000)
return -ETIMEDOUT;
}
return 0;
}
/**
* hw_device_reset: resets chip (execute without interruption)
* @ci: the controller
*
* This function returns an error code
*/
int hw_device_reset(struct ci_hdrc *ci)
{
int ret;
/* should flush & stop before reset */
hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
ret = hw_controller_reset(ci);
if (ret) {
dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
return ret;
}
if (ci->platdata->notify_event) {
ret = ci->platdata->notify_event(ci,
CI_HDRC_CONTROLLER_RESET_EVENT);
if (ret)
return ret;
}
/* USBMODE should be configured step by step */
hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
/* HW >= 2.3 */
hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
dev_err(ci->dev, "cannot enter in %s device mode\n",
ci_role(ci)->name);
dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
return -ENODEV;
}
ci_platform_configure(ci);
return 0;
}
static irqreturn_t ci_irq_handler(int irq, void *data)
{
struct ci_hdrc *ci = data;
irqreturn_t ret = IRQ_NONE;
u32 otgsc = 0;
if (ci->in_lpm) {
disable_irq_nosync(irq);
ci->wakeup_int = true;
pm_runtime_get(ci->dev);
return IRQ_HANDLED;
}
if (ci->is_otg) {
otgsc = hw_read_otgsc(ci, ~0);
if (ci_otg_is_fsm_mode(ci)) {
ret = ci_otg_fsm_irq(ci);
if (ret == IRQ_HANDLED)
return ret;
}
}
/*
* Handle id change interrupt, it indicates device/host function
* switch.
*/
if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
ci->id_event = true;
/* Clear ID change irq status */
hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
ci_otg_queue_work(ci);
return IRQ_HANDLED;
}
/*
* Handle vbus change interrupt, it indicates device connection
* and disconnection events.
*/
if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
ci->b_sess_valid_event = true;
/* Clear BSV irq */
hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
ci_otg_queue_work(ci);
return IRQ_HANDLED;
}
/* Handle device/host interrupt */
if (ci->role != CI_ROLE_END)
ret = ci_role(ci)->irq(ci);
return ret;
}
static void ci_irq(struct ci_hdrc *ci)
{
unsigned long flags;
local_irq_save(flags);
ci_irq_handler(ci->irq, ci);
local_irq_restore(flags);
}
static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
struct ci_hdrc *ci = cbl->ci;
cbl->connected = event;
cbl->changed = true;
ci_irq(ci);
return NOTIFY_DONE;
}
static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
{
struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
enum usb_role role;
unsigned long flags;
spin_lock_irqsave(&ci->lock, flags);
role = ci_role_to_usb_role(ci);
spin_unlock_irqrestore(&ci->lock, flags);
return role;
}
static int ci_usb_role_switch_set(struct usb_role_switch *sw,
enum usb_role role)
{
struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
struct ci_hdrc_cable *cable;
if (role == USB_ROLE_HOST) {
cable = &ci->platdata->id_extcon;
cable->changed = true;
cable->connected = true;
cable = &ci->platdata->vbus_extcon;
cable->changed = true;
cable->connected = false;
} else if (role == USB_ROLE_DEVICE) {
cable = &ci->platdata->id_extcon;
cable->changed = true;
cable->connected = false;
cable = &ci->platdata->vbus_extcon;
cable->changed = true;
cable->connected = true;
} else {
cable = &ci->platdata->id_extcon;
cable->changed = true;
cable->connected = false;
cable = &ci->platdata->vbus_extcon;
cable->changed = true;
cable->connected = false;
}
ci_irq(ci);
return 0;
}
static enum ci_role ci_get_role(struct ci_hdrc *ci)
{
enum ci_role role;
if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
if (ci->is_otg) {
role = ci_otg_role(ci);
hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
} else {
/*
* If the controller is not OTG capable, but support
* role switch, the defalt role is gadget, and the
* user can switch it through debugfs.
*/
role = CI_ROLE_GADGET;
}
} else {
role = ci->roles[CI_ROLE_HOST] ? CI_ROLE_HOST
: CI_ROLE_GADGET;
}
return role;
}
static struct usb_role_switch_desc ci_role_switch = {
.set = ci_usb_role_switch_set,
.get = ci_usb_role_switch_get,
.allow_userspace_control = true,
};
static int ci_get_platdata(struct device *dev,
struct ci_hdrc_platform_data *platdata)
{
struct extcon_dev *ext_vbus, *ext_id;
struct ci_hdrc_cable *cable;
int ret;
if (!platdata->phy_mode)
platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
if (!platdata->dr_mode)
platdata->dr_mode = usb_get_dr_mode(dev);
if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
platdata->dr_mode = USB_DR_MODE_OTG;
if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
/* Get the vbus regulator */
platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
return -EPROBE_DEFER;
} else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
/* no vbus regulator is needed */
platdata->reg_vbus = NULL;
} else if (IS_ERR(platdata->reg_vbus)) {
dev_err(dev, "Getting regulator error: %ld\n",
PTR_ERR(platdata->reg_vbus));
return PTR_ERR(platdata->reg_vbus);
}
/* Get TPL support */
if (!platdata->tpl_support)
platdata->tpl_support =
of_usb_host_tpl_support(dev->of_node);
}
if (platdata->dr_mode == USB_DR_MODE_OTG) {
/* We can support HNP and SRP of OTG 2.0 */
platdata->ci_otg_caps.otg_rev = 0x0200;
platdata->ci_otg_caps.hnp_support = true;
platdata->ci_otg_caps.srp_support = true;
/* Update otg capabilities by DT properties */
ret = of_usb_update_otg_caps(dev->of_node,
&platdata->ci_otg_caps);
if (ret)
return ret;
}
if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
&platdata->phy_clkgate_delay_us);
platdata->itc_setting = 1;
of_property_read_u32(dev->of_node, "itc-setting",
&platdata->itc_setting);
ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
&platdata->ahb_burst_config);
if (!ret) {
platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
} else if (ret != -EINVAL) {
dev_err(dev, "failed to get ahb-burst-config\n");
return ret;
}
ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
&platdata->tx_burst_size);
if (!ret) {
platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
} else if (ret != -EINVAL) {
dev_err(dev, "failed to get tx-burst-size-dword\n");
return ret;
}
ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
&platdata->rx_burst_size);
if (!ret) {
platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
} else if (ret != -EINVAL) {
dev_err(dev, "failed to get rx-burst-size-dword\n");
return ret;
}
if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
ext_id = ERR_PTR(-ENODEV);
ext_vbus = ERR_PTR(-ENODEV);
if (of_property_read_bool(dev->of_node, "extcon")) {
/* Each one of them is not mandatory */
ext_vbus = extcon_get_edev_by_phandle(dev, 0);
if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
return PTR_ERR(ext_vbus);
ext_id = extcon_get_edev_by_phandle(dev, 1);
if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
return PTR_ERR(ext_id);
}
cable = &platdata->vbus_extcon;
cable->nb.notifier_call = ci_cable_notifier;
cable->edev = ext_vbus;
if (!IS_ERR(ext_vbus)) {
ret = extcon_get_state(cable->edev, EXTCON_USB);
if (ret)
cable->connected = true;
else
cable->connected = false;
}
cable = &platdata->id_extcon;
cable->nb.notifier_call = ci_cable_notifier;
cable->edev = ext_id;
if (!IS_ERR(ext_id)) {
ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
if (ret)
cable->connected = true;
else
cable->connected = false;
}
if (device_property_read_bool(dev, "usb-role-switch"))
ci_role_switch.fwnode = dev->fwnode;
platdata->pctl = devm_pinctrl_get(dev);
if (!IS_ERR(platdata->pctl)) {
struct pinctrl_state *p;
p = pinctrl_lookup_state(platdata->pctl, "default");
if (!IS_ERR(p))
platdata->pins_default = p;
p = pinctrl_lookup_state(platdata->pctl, "host");
if (!IS_ERR(p))
platdata->pins_host = p;
p = pinctrl_lookup_state(platdata->pctl, "device");
if (!IS_ERR(p))
platdata->pins_device = p;
}
if (!platdata->enter_lpm)
platdata->enter_lpm = ci_hdrc_enter_lpm_common;
return 0;
}
static int ci_extcon_register(struct ci_hdrc *ci)
{
struct ci_hdrc_cable *id, *vbus;
int ret;
id = &ci->platdata->id_extcon;
id->ci = ci;
if (!IS_ERR_OR_NULL(id->edev)) {
ret = devm_extcon_register_notifier(ci->dev, id->edev,
EXTCON_USB_HOST, &id->nb);
if (ret < 0) {
dev_err(ci->dev, "register ID failed\n");
return ret;
}
}
vbus = &ci->platdata->vbus_extcon;
vbus->ci = ci;
if (!IS_ERR_OR_NULL(vbus->edev)) {
ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
EXTCON_USB, &vbus->nb);
if (ret < 0) {
dev_err(ci->dev, "register VBUS failed\n");
return ret;
}
}
return 0;
}
static DEFINE_IDA(ci_ida);
struct platform_device *ci_hdrc_add_device(struct device *dev,
struct resource *res, int nres,
struct ci_hdrc_platform_data *platdata)
{
struct platform_device *pdev;
int id, ret;
ret = ci_get_platdata(dev, platdata);
if (ret)
return ERR_PTR(ret);
id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
pdev = platform_device_alloc("ci_hdrc", id);
if (!pdev) {
ret = -ENOMEM;
goto put_id;
}
pdev->dev.parent = dev;
device_set_of_node_from_dev(&pdev->dev, dev);
ret = platform_device_add_resources(pdev, res, nres);
if (ret)
goto err;
ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
if (ret)
goto err;
ret = platform_device_add(pdev);
if (ret)
goto err;
return pdev;
err:
platform_device_put(pdev);
put_id:
ida_simple_remove(&ci_ida, id);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
void ci_hdrc_remove_device(struct platform_device *pdev)
{
int id = pdev->id;
platform_device_unregister(pdev);
ida_simple_remove(&ci_ida, id);
}
EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
/**
* ci_hdrc_query_available_role: get runtime available operation mode
*
* The glue layer can get current operation mode (host/peripheral/otg)
* This function should be called after ci core device has created.
*
* @pdev: the platform device of ci core.
*
* Return runtime usb_dr_mode.
*/
enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
{
struct ci_hdrc *ci = platform_get_drvdata(pdev);
if (!ci)
return USB_DR_MODE_UNKNOWN;
if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
return USB_DR_MODE_OTG;
else if (ci->roles[CI_ROLE_HOST])
return USB_DR_MODE_HOST;
else if (ci->roles[CI_ROLE_GADGET])
return USB_DR_MODE_PERIPHERAL;
else
return USB_DR_MODE_UNKNOWN;
}
EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
static inline void ci_role_destroy(struct ci_hdrc *ci)
{
ci_hdrc_gadget_destroy(ci);
ci_hdrc_host_destroy(ci);
if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
ci_hdrc_otg_destroy(ci);
}
static void ci_get_otg_capable(struct ci_hdrc *ci)
{
if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
ci->is_otg = false;
else
ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
DCCPARAMS_DC | DCCPARAMS_HC)
== (DCCPARAMS_DC | DCCPARAMS_HC));
if (ci->is_otg) {
dev_dbg(ci->dev, "It is OTG capable controller\n");
/* Disable and clear all OTG irq */
hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
OTGSC_INT_STATUS_BITS);
}
}
static ssize_t role_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (ci->role != CI_ROLE_END)
return sprintf(buf, "%s\n", ci_role(ci)->name);
return 0;
}
static ssize_t role_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
enum ci_role role;
int ret;
if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
dev_warn(dev, "Current configuration is not dual-role, quit\n");
return -EPERM;
}
for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
if (!strncmp(buf, ci->roles[role]->name,
strlen(ci->roles[role]->name)))
break;
if (role == CI_ROLE_END)
return -EINVAL;
mutex_lock(&ci->mutex);
if (role == ci->role) {
mutex_unlock(&ci->mutex);
return n;
}
pm_runtime_get_sync(dev);
disable_irq(ci->irq);
ci_role_stop(ci);
ret = ci_role_start(ci, role);
if (!ret && ci->role == CI_ROLE_GADGET)
ci_handle_vbus_change(ci);
enable_irq(ci->irq);
pm_runtime_put_sync(dev);
mutex_unlock(&ci->mutex);
return (ret == 0) ? n : ret;
}
static DEVICE_ATTR_RW(role);
static struct attribute *ci_attrs[] = {
&dev_attr_role.attr,
NULL,
};
ATTRIBUTE_GROUPS(ci);
static int ci_hdrc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ci_hdrc *ci;
struct resource *res;
void __iomem *base;
int ret;
enum usb_dr_mode dr_mode;
if (!dev_get_platdata(dev)) {
dev_err(dev, "platform data missing\n");
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
if (!ci)
return -ENOMEM;
spin_lock_init(&ci->lock);
mutex_init(&ci->mutex);
ci->dev = dev;
ci->platdata = dev_get_platdata(dev);
ci->imx28_write_fix = !!(ci->platdata->flags &
CI_HDRC_IMX28_WRITE_FIX);
ci->supports_runtime_pm = !!(ci->platdata->flags &
CI_HDRC_SUPPORTS_RUNTIME_PM);
platform_set_drvdata(pdev, ci);
ret = hw_device_init(ci, base);
if (ret < 0) {
dev_err(dev, "can't initialize hardware\n");
return -ENODEV;
}
ret = ci_ulpi_init(ci);
if (ret)
return ret;
if (ci->platdata->phy) {
ci->phy = ci->platdata->phy;
} else if (ci->platdata->usb_phy) {
ci->usb_phy = ci->platdata->usb_phy;
} else {
/* Look for a generic PHY first */
ci->phy = devm_phy_get(dev->parent, "usb-phy");
if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto ulpi_exit;
} else if (IS_ERR(ci->phy)) {
ci->phy = NULL;
}
/* Look for a legacy USB PHY from device-tree next */
if (!ci->phy) {
ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
"phys", 0);
if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto ulpi_exit;
} else if (IS_ERR(ci->usb_phy)) {
ci->usb_phy = NULL;
}
}
/* Look for any registered legacy USB PHY as last resort */
if (!ci->phy && !ci->usb_phy) {
ci->usb_phy = devm_usb_get_phy(dev->parent,
USB_PHY_TYPE_USB2);
if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto ulpi_exit;
} else if (IS_ERR(ci->usb_phy)) {
ci->usb_phy = NULL;
}
}
/* No USB PHY was found in the end */
if (!ci->phy && !ci->usb_phy) {
ret = -ENXIO;
goto ulpi_exit;
}
}
ret = ci_usb_phy_init(ci);
if (ret) {
dev_err(dev, "unable to init phy: %d\n", ret);
goto ulpi_exit;
}
ci->hw_bank.phys = res->start;
ci->irq = platform_get_irq(pdev, 0);
if (ci->irq < 0) {
ret = ci->irq;
goto deinit_phy;
}
ci_get_otg_capable(ci);
dr_mode = ci->platdata->dr_mode;
/* initialize role(s) before the interrupt is requested */
if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
ret = ci_hdrc_host_init(ci);
if (ret) {
if (ret == -ENXIO)
dev_info(dev, "doesn't support host\n");
else
goto deinit_phy;
}
}
if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
ret = ci_hdrc_gadget_init(ci);
if (ret) {
if (ret == -ENXIO)
dev_info(dev, "doesn't support gadget\n");
else
goto deinit_host;
}
}
if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
dev_err(dev, "no supported roles\n");
ret = -ENODEV;
goto deinit_gadget;
}
if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
ret = ci_hdrc_otg_init(ci);
if (ret) {
dev_err(dev, "init otg fails, ret = %d\n", ret);
goto deinit_gadget;
}
}
if (ci_role_switch.fwnode) {
ci_role_switch.driver_data = ci;
ci->role_switch = usb_role_switch_register(dev,
&ci_role_switch);
if (IS_ERR(ci->role_switch)) {
ret = PTR_ERR(ci->role_switch);
goto deinit_otg;
}
}
ci->role = ci_get_role(ci);
if (!ci_otg_is_fsm_mode(ci)) {
/* only update vbus status for peripheral */
if (ci->role == CI_ROLE_GADGET) {
/* Pull down DP for possible charger detection */
hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
ci_handle_vbus_change(ci);
}
ret = ci_role_start(ci, ci->role);
if (ret) {
dev_err(dev, "can't start %s role\n",
ci_role(ci)->name);
goto stop;
}
}
ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
ci->platdata->name, ci);
if (ret)
goto stop;
ret = ci_extcon_register(ci);
if (ret)
goto stop;
if (ci->supports_runtime_pm) {
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
pm_runtime_mark_last_busy(ci->dev);
pm_runtime_use_autosuspend(&pdev->dev);
}
if (ci_otg_is_fsm_mode(ci))
ci_hdrc_otg_fsm_start(ci);
device_set_wakeup_capable(&pdev->dev, true);
dbg_create_files(ci);
return 0;
stop:
if (ci->role_switch)
usb_role_switch_unregister(ci->role_switch);
deinit_otg:
if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
ci_hdrc_otg_destroy(ci);
deinit_gadget:
ci_hdrc_gadget_destroy(ci);
deinit_host:
ci_hdrc_host_destroy(ci);
deinit_phy:
ci_usb_phy_exit(ci);
ulpi_exit:
ci_ulpi_exit(ci);
return ret;
}
static int ci_hdrc_remove(struct platform_device *pdev)
{
struct ci_hdrc *ci = platform_get_drvdata(pdev);
if (ci->role_switch)
usb_role_switch_unregister(ci->role_switch);
if (ci->supports_runtime_pm) {
pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
}
dbg_remove_files(ci);
ci_role_destroy(ci);
ci_hdrc_enter_lpm(ci, true);
ci_usb_phy_exit(ci);
ci_ulpi_exit(ci);
return 0;
}
#ifdef CONFIG_PM
/* Prepare wakeup by SRP before suspend */
static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
{
if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
!hw_read_otgsc(ci, OTGSC_ID)) {
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
PORTSC_PP);
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
PORTSC_WKCN);
}
}
/* Handle SRP when wakeup by data pulse */
static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
{
if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
(ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
if (!hw_read_otgsc(ci, OTGSC_ID)) {
ci->fsm.a_srp_det = 1;
ci->fsm.a_bus_drop = 0;
} else {
ci->fsm.id = 1;
}
ci_otg_queue_work(ci);
}
}
static void ci_controller_suspend(struct ci_hdrc *ci)
{
disable_irq(ci->irq);
ci_hdrc_enter_lpm(ci, true);
if (ci->platdata->phy_clkgate_delay_us)
usleep_range(ci->platdata->phy_clkgate_delay_us,
ci->platdata->phy_clkgate_delay_us + 50);
usb_phy_set_suspend(ci->usb_phy, 1);
ci->in_lpm = true;
enable_irq(ci->irq);
}
/*
* Handle the wakeup interrupt triggered by extcon connector
* We need to call ci_irq again for extcon since the first
* interrupt (wakeup int) only let the controller be out of
* low power mode, but not handle any interrupts.
*/
static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
{
struct ci_hdrc_cable *cable_id, *cable_vbus;
u32 otgsc = hw_read_otgsc(ci, ~0);
cable_id = &ci->platdata->id_extcon;
cable_vbus = &ci->platdata->vbus_extcon;
if ((!IS_ERR(cable_id->edev) || ci->role_switch)
&& ci->is_otg &&
(otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
ci_irq(ci);
if ((!IS_ERR(cable_vbus->edev) || ci->role_switch)
&& ci->is_otg &&
(otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
ci_irq(ci);
}
static int ci_controller_resume(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "at %s\n", __func__);
if (!ci->in_lpm) {
WARN_ON(1);
return 0;
}
ci_hdrc_enter_lpm(ci, false);
ret = ci_ulpi_resume(ci);
if (ret)
return ret;
if (ci->usb_phy) {
usb_phy_set_suspend(ci->usb_phy, 0);
usb_phy_set_wakeup(ci->usb_phy, false);
hw_wait_phy_stable();
}
ci->in_lpm = false;
if (ci->wakeup_int) {
ci->wakeup_int = false;
pm_runtime_mark_last_busy(ci->dev);
pm_runtime_put_autosuspend(ci->dev);
enable_irq(ci->irq);
if (ci_otg_is_fsm_mode(ci))
ci_otg_fsm_wakeup_by_srp(ci);
ci_extcon_wakeup_int(ci);
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ci_suspend(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (ci->wq)
flush_workqueue(ci->wq);
/*
* Controller needs to be active during suspend, otherwise the core
* may run resume when the parent is at suspend if other driver's
* suspend fails, it occurs before parent's suspend has not started,
* but the core suspend has finished.
*/
if (ci->in_lpm)
pm_runtime_resume(dev);
if (ci->in_lpm) {
WARN_ON(1);
return 0;
}
/* Extra routine per role before system suspend */
if (ci->role != CI_ROLE_END && ci_role(ci)->suspend)
ci_role(ci)->suspend(ci);
if (device_may_wakeup(dev)) {
if (ci_otg_is_fsm_mode(ci))
ci_otg_fsm_suspend_for_srp(ci);
usb_phy_set_wakeup(ci->usb_phy, true);
enable_irq_wake(ci->irq);
}
ci_controller_suspend(ci);
return 0;
}
static void ci_handle_power_lost(struct ci_hdrc *ci)
{
enum ci_role role;
disable_irq_nosync(ci->irq);
if (!ci_otg_is_fsm_mode(ci)) {
role = ci_get_role(ci);
if (ci->role != role) {
ci_handle_id_switch(ci);
} else if (role == CI_ROLE_GADGET) {
if (ci->is_otg && hw_read_otgsc(ci, OTGSC_BSV))
usb_gadget_vbus_connect(&ci->gadget);
}
}
enable_irq(ci->irq);
}
static int ci_resume(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
bool power_lost;
int ret;
/* Since ASYNCLISTADDR (host mode) and ENDPTLISTADDR (device
* mode) share the same register address. We can check if
* controller resume from power lost based on this address
* due to this register will be reset after power lost.
*/
power_lost = !hw_read(ci, OP_ENDPTLISTADDR, ~0);
if (device_may_wakeup(dev))
disable_irq_wake(ci->irq);
ret = ci_controller_resume(dev);
if (ret)
return ret;
if (power_lost) {
/* shutdown and re-init for phy */
ci_usb_phy_exit(ci);
ci_usb_phy_init(ci);
}
/* Extra routine per role after system resume */
if (ci->role != CI_ROLE_END && ci_role(ci)->resume)
ci_role(ci)->resume(ci, power_lost);
if (power_lost)
ci_handle_power_lost(ci);
if (ci->supports_runtime_pm) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
return ret;
}
#endif /* CONFIG_PM_SLEEP */
static int ci_runtime_suspend(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
dev_dbg(dev, "at %s\n", __func__);
if (ci->in_lpm) {
WARN_ON(1);
return 0;
}
if (ci_otg_is_fsm_mode(ci))
ci_otg_fsm_suspend_for_srp(ci);
usb_phy_set_wakeup(ci->usb_phy, true);
ci_controller_suspend(ci);
return 0;
}
static int ci_runtime_resume(struct device *dev)
{
return ci_controller_resume(dev);
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops ci_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
};
static struct platform_driver ci_hdrc_driver = {
.probe = ci_hdrc_probe,
.remove = ci_hdrc_remove,
.driver = {
.name = "ci_hdrc",
.pm = &ci_pm_ops,
.dev_groups = ci_groups,
},
};
static int __init ci_hdrc_platform_register(void)
{
ci_hdrc_host_driver_init();
return platform_driver_register(&ci_hdrc_driver);
}
module_init(ci_hdrc_platform_register);
static void __exit ci_hdrc_platform_unregister(void)
{
platform_driver_unregister(&ci_hdrc_driver);
}
module_exit(ci_hdrc_platform_unregister);
MODULE_ALIAS("platform:ci_hdrc");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
MODULE_DESCRIPTION("ChipIdea HDRC Driver");