mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
fef2263688
Commit [1] enabled the possibility of checking the DVST (Device State Transition) bit of INTSTS0 (Interrupt Status Register 0) and calling the irq_dev_state() handler if the DVST bit is set. But neither commit [1] nor commit [2] actually enabled the DVSE (Device State Transition Interrupt Enable) bit in the INTENB0 (Interrupt Enable Register 0). As a consequence, irq_dev_state() handler is getting called as a side effect of other (non-DVSE) interrupts being fired, which definitely can't be relied upon, if DVST notifications are of any value. Why this doesn't hurt is because usbhsg_irq_dev_state() currently doesn't do much except of a dev_dbg(). Once more work is added to the handler (e.g. detecting device "Suspended" state and notifying other USB gadget components about it), enabling DVSE becomes a hard requirement. Do it in a standalone commit for better visibility and clear explanation. [1] commitf1407d5c66("usb: renesas_usbhs: Add Renesas USBHS common code") [2] commit2f98382dcd("usb: renesas_usbhs: Add Renesas USBHS Gadget") Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com> Signed-off-by: Veeraiyan Chidambaram <veeraiyan.chidambaram@in.bosch.com> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/1568207756-22325-2-git-send-email-external.veeraiyan.c@de.adit-jv.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
388 lines
8.4 KiB
C
388 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-1.0+
|
|
/*
|
|
* Renesas USB driver
|
|
*
|
|
* Copyright (C) 2011 Renesas Solutions Corp.
|
|
* Copyright (C) 2019 Renesas Electronics Corporation
|
|
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
|
|
*/
|
|
#include <linux/interrupt.h>
|
|
|
|
#include "common.h"
|
|
#include "mod.h"
|
|
|
|
/*
|
|
* autonomy
|
|
*
|
|
* these functions are used if platform doesn't have external phy.
|
|
* -> there is no "notify_hotplug" callback from platform
|
|
* -> call "notify_hotplug" by itself
|
|
* -> use own interrupt to connect/disconnect
|
|
* -> it mean module clock is always ON
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
|
|
{
|
|
struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
|
|
|
|
return VBSTS & usbhs_read(priv, INTSTS0);
|
|
}
|
|
|
|
static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
|
|
struct usbhs_irq_state *irq_state)
|
|
{
|
|
struct platform_device *pdev = usbhs_priv_to_pdev(priv);
|
|
|
|
usbhsc_schedule_notify_hotplug(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
info->irq_vbus = usbhsm_autonomy_irq_vbus;
|
|
info->get_vbus = usbhsm_autonomy_get_vbus;
|
|
|
|
usbhs_irq_callback_update(priv, NULL);
|
|
}
|
|
|
|
void usbhs_mod_non_autonomy_mode(struct usbhs_priv *priv)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
info->get_vbus = priv->pfunc->get_vbus;
|
|
}
|
|
|
|
/*
|
|
* host / gadget functions
|
|
*
|
|
* renesas_usbhs host/gadget can register itself by below functions.
|
|
* these functions are called when probe
|
|
*
|
|
*/
|
|
void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
info->mod[id] = mod;
|
|
mod->priv = priv;
|
|
}
|
|
|
|
struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
struct usbhs_mod *ret = NULL;
|
|
|
|
switch (id) {
|
|
case USBHS_HOST:
|
|
case USBHS_GADGET:
|
|
ret = info->mod[id];
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int usbhs_mod_is_host(struct usbhs_priv *priv)
|
|
{
|
|
struct usbhs_mod *mod = usbhs_mod_get_current(priv);
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
if (!mod)
|
|
return -EINVAL;
|
|
|
|
return info->mod[USBHS_HOST] == mod;
|
|
}
|
|
|
|
struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
return info->curt;
|
|
}
|
|
|
|
int usbhs_mod_change(struct usbhs_priv *priv, int id)
|
|
{
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
struct usbhs_mod *mod = NULL;
|
|
int ret = 0;
|
|
|
|
/* id < 0 mean no current */
|
|
switch (id) {
|
|
case USBHS_HOST:
|
|
case USBHS_GADGET:
|
|
mod = info->mod[id];
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
info->curt = mod;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t usbhs_interrupt(int irq, void *data);
|
|
int usbhs_mod_probe(struct usbhs_priv *priv)
|
|
{
|
|
struct device *dev = usbhs_priv_to_dev(priv);
|
|
int ret;
|
|
|
|
/*
|
|
* install host/gadget driver
|
|
*/
|
|
ret = usbhs_mod_host_probe(priv);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = usbhs_mod_gadget_probe(priv);
|
|
if (ret < 0)
|
|
goto mod_init_host_err;
|
|
|
|
/* irq settings */
|
|
ret = devm_request_irq(dev, priv->irq, usbhs_interrupt,
|
|
priv->irqflags, dev_name(dev), priv);
|
|
if (ret) {
|
|
dev_err(dev, "irq request err\n");
|
|
goto mod_init_gadget_err;
|
|
}
|
|
|
|
return ret;
|
|
|
|
mod_init_gadget_err:
|
|
usbhs_mod_gadget_remove(priv);
|
|
mod_init_host_err:
|
|
usbhs_mod_host_remove(priv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void usbhs_mod_remove(struct usbhs_priv *priv)
|
|
{
|
|
usbhs_mod_host_remove(priv);
|
|
usbhs_mod_gadget_remove(priv);
|
|
}
|
|
|
|
/*
|
|
* status functions
|
|
*/
|
|
int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
|
|
{
|
|
return (int)irq_state->intsts0 & DVSQ_MASK;
|
|
}
|
|
|
|
int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
|
|
{
|
|
/*
|
|
* return value
|
|
*
|
|
* IDLE_SETUP_STAGE
|
|
* READ_DATA_STAGE
|
|
* READ_STATUS_STAGE
|
|
* WRITE_DATA_STAGE
|
|
* WRITE_STATUS_STAGE
|
|
* NODATA_STATUS_STAGE
|
|
* SEQUENCE_ERROR
|
|
*/
|
|
return (int)irq_state->intsts0 & CTSQ_MASK;
|
|
}
|
|
|
|
static int usbhs_status_get_each_irq(struct usbhs_priv *priv,
|
|
struct usbhs_irq_state *state)
|
|
{
|
|
struct usbhs_mod *mod = usbhs_mod_get_current(priv);
|
|
u16 intenb0, intenb1;
|
|
unsigned long flags;
|
|
|
|
/******************** spin lock ********************/
|
|
usbhs_lock(priv, flags);
|
|
state->intsts0 = usbhs_read(priv, INTSTS0);
|
|
intenb0 = usbhs_read(priv, INTENB0);
|
|
|
|
if (usbhs_mod_is_host(priv)) {
|
|
state->intsts1 = usbhs_read(priv, INTSTS1);
|
|
intenb1 = usbhs_read(priv, INTENB1);
|
|
} else {
|
|
state->intsts1 = intenb1 = 0;
|
|
}
|
|
|
|
/* mask */
|
|
if (mod) {
|
|
state->brdysts = usbhs_read(priv, BRDYSTS);
|
|
state->nrdysts = usbhs_read(priv, NRDYSTS);
|
|
state->bempsts = usbhs_read(priv, BEMPSTS);
|
|
|
|
state->bempsts &= mod->irq_bempsts;
|
|
state->brdysts &= mod->irq_brdysts;
|
|
}
|
|
usbhs_unlock(priv, flags);
|
|
/******************** spin unlock ******************/
|
|
|
|
/*
|
|
* Check whether the irq enable registers and the irq status are set
|
|
* when IRQF_SHARED is set.
|
|
*/
|
|
if (priv->irqflags & IRQF_SHARED) {
|
|
if (!(intenb0 & state->intsts0) &&
|
|
!(intenb1 & state->intsts1) &&
|
|
!(state->bempsts) &&
|
|
!(state->brdysts))
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* interrupt
|
|
*/
|
|
#define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
|
|
#define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
|
|
static irqreturn_t usbhs_interrupt(int irq, void *data)
|
|
{
|
|
struct usbhs_priv *priv = data;
|
|
struct usbhs_irq_state irq_state;
|
|
|
|
if (usbhs_status_get_each_irq(priv, &irq_state) < 0)
|
|
return IRQ_NONE;
|
|
|
|
/*
|
|
* clear interrupt
|
|
*
|
|
* The hardware is _very_ picky to clear interrupt bit.
|
|
* Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
|
|
*
|
|
* see
|
|
* "Operation"
|
|
* - "Control Transfer (DCP)"
|
|
* - Function :: VALID bit should 0
|
|
*/
|
|
usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
|
|
if (usbhs_mod_is_host(priv))
|
|
usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
|
|
|
|
/*
|
|
* The driver should not clear the xxxSTS after the line of
|
|
* "call irq callback functions" because each "if" statement is
|
|
* possible to call the callback function for avoiding any side effects.
|
|
*/
|
|
if (irq_state.intsts0 & BRDY)
|
|
usbhs_write(priv, BRDYSTS, ~irq_state.brdysts);
|
|
usbhs_write(priv, NRDYSTS, ~irq_state.nrdysts);
|
|
if (irq_state.intsts0 & BEMP)
|
|
usbhs_write(priv, BEMPSTS, ~irq_state.bempsts);
|
|
|
|
/*
|
|
* call irq callback functions
|
|
* see also
|
|
* usbhs_irq_setting_update
|
|
*/
|
|
|
|
/* INTSTS0 */
|
|
if (irq_state.intsts0 & VBINT)
|
|
usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
|
|
|
|
if (irq_state.intsts0 & DVST)
|
|
usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
|
|
|
|
if (irq_state.intsts0 & CTRT)
|
|
usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
|
|
|
|
if (irq_state.intsts0 & BEMP)
|
|
usbhs_mod_call(priv, irq_empty, priv, &irq_state);
|
|
|
|
if (irq_state.intsts0 & BRDY)
|
|
usbhs_mod_call(priv, irq_ready, priv, &irq_state);
|
|
|
|
if (usbhs_mod_is_host(priv)) {
|
|
/* INTSTS1 */
|
|
if (irq_state.intsts1 & ATTCH)
|
|
usbhs_mod_call(priv, irq_attch, priv, &irq_state);
|
|
|
|
if (irq_state.intsts1 & DTCH)
|
|
usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
|
|
|
|
if (irq_state.intsts1 & SIGN)
|
|
usbhs_mod_call(priv, irq_sign, priv, &irq_state);
|
|
|
|
if (irq_state.intsts1 & SACK)
|
|
usbhs_mod_call(priv, irq_sack, priv, &irq_state);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
|
|
{
|
|
u16 intenb0 = 0;
|
|
u16 intenb1 = 0;
|
|
struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
|
|
|
|
/*
|
|
* BEMPENB/BRDYENB are picky.
|
|
* below method is required
|
|
*
|
|
* - clear INTSTS0
|
|
* - update BEMPENB/BRDYENB
|
|
* - update INTSTS0
|
|
*/
|
|
usbhs_write(priv, INTENB0, 0);
|
|
if (usbhs_mod_is_host(priv))
|
|
usbhs_write(priv, INTENB1, 0);
|
|
|
|
usbhs_write(priv, BEMPENB, 0);
|
|
usbhs_write(priv, BRDYENB, 0);
|
|
|
|
/*
|
|
* see also
|
|
* usbhs_interrupt
|
|
*/
|
|
|
|
if (info->irq_vbus)
|
|
intenb0 |= VBSE;
|
|
|
|
if (mod) {
|
|
/*
|
|
* INTSTS0
|
|
*/
|
|
if (mod->irq_ctrl_stage)
|
|
intenb0 |= CTRE;
|
|
|
|
if (mod->irq_dev_state)
|
|
intenb0 |= DVSE;
|
|
|
|
if (mod->irq_empty && mod->irq_bempsts) {
|
|
usbhs_write(priv, BEMPENB, mod->irq_bempsts);
|
|
intenb0 |= BEMPE;
|
|
}
|
|
|
|
if (mod->irq_ready && mod->irq_brdysts) {
|
|
usbhs_write(priv, BRDYENB, mod->irq_brdysts);
|
|
intenb0 |= BRDYE;
|
|
}
|
|
|
|
if (usbhs_mod_is_host(priv)) {
|
|
/*
|
|
* INTSTS1
|
|
*/
|
|
if (mod->irq_attch)
|
|
intenb1 |= ATTCHE;
|
|
|
|
if (mod->irq_dtch)
|
|
intenb1 |= DTCHE;
|
|
|
|
if (mod->irq_sign)
|
|
intenb1 |= SIGNE;
|
|
|
|
if (mod->irq_sack)
|
|
intenb1 |= SACKE;
|
|
}
|
|
}
|
|
|
|
if (intenb0)
|
|
usbhs_write(priv, INTENB0, intenb0);
|
|
|
|
if (usbhs_mod_is_host(priv) && intenb1)
|
|
usbhs_write(priv, INTENB1, intenb1);
|
|
}
|