- 根目录:
- drivers
- usb
- musb
- omap2430.c
/*
* Copyright (C) 2005-2007 by Texas Instruments
* Some code has been taken from tusb6010.c
* Copyrights for that are attributable to:
* Copyright (C) 2006 Nokia Corporation
* Tony Lindgren <tony@atomide.com>
*
* 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.
*
* The Inventra Controller Driver for Linux is distributed in
* the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The Inventra Controller Driver for Linux ; if not,
* write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/usb/musb-omap.h>
#include <linux/phy/omap_control_phy.h>
#include <linux/of_platform.h>
#include "musb_core.h"
#include "omap2430.h"
struct omap2430_glue {
struct device *dev;
struct platform_device *musb;
enum omap_musb_vbus_id_status status;
struct work_struct omap_musb_mailbox_work;
struct device *control_otghs;
};
#define glue_to_musb(g) platform_get_drvdata(g->musb)
static struct omap2430_glue *_glue;
static struct timer_list musb_idle_timer;
static void musb_do_idle(unsigned long _musb)
{
struct musb *musb = (void *)_musb;
unsigned long flags;
u8 power;
u8 devctl;
spin_lock_irqsave(&musb->lock, flags);
switch (musb->xceiv->state) {
case OTG_STATE_A_WAIT_BCON:
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (devctl & MUSB_DEVCTL_BDEVICE) {
musb->xceiv->state = OTG_STATE_B_IDLE;
MUSB_DEV_MODE(musb);
} else {
musb->xceiv->state = OTG_STATE_A_IDLE;
MUSB_HST_MODE(musb);
}
break;
case OTG_STATE_A_SUSPEND:
/* finish RESUME signaling? */
if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
power = musb_readb(musb->mregs, MUSB_POWER);
power &= ~MUSB_POWER_RESUME;
dev_dbg(musb->controller, "root port resume stopped, power %02x\n", power);
musb_writeb(musb->mregs, MUSB_POWER, power);
musb->is_active = 1;
musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
| MUSB_PORT_STAT_RESUME);
musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
usb_hcd_poll_rh_status(musb->hcd);
/* NOTE: it might really be A_WAIT_BCON ... */
musb->xceiv->state = OTG_STATE_A_HOST;
}
break;
case OTG_STATE_A_HOST:
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (devctl & MUSB_DEVCTL_BDEVICE)
musb->xceiv->state = OTG_STATE_B_IDLE;
else
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
default:
break;
}
spin_unlock_irqrestore(&musb->lock, flags);
}
static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
{
unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
static unsigned long last_timer;
if (timeout == 0)
timeout = default_timeout;
/* Never idle if active, or when VBUS timeout is not set as host */
if (musb->is_active || ((musb->a_wait_bcon == 0)
&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
dev_dbg(musb->controller, "%s active, deleting timer\n",
usb_otg_state_string(musb->xceiv->state));
del_timer(&musb_idle_timer);
last_timer = jiffies;
return;
}
if (time_after(last_timer, timeout)) {
if (!timer_pending(&musb_idle_timer))
last_timer = timeout;
else {
dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n");
return;
}
}
last_timer = timeout;
dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n",
usb_otg_state_string(musb->xceiv->state),
(unsigned long)jiffies_to_msecs(timeout - jiffies));
mod_timer(&musb_idle_timer, timeout);
}
static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
{
struct usb_otg *otg = musb->xceiv->otg;
u8 devctl;
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
/* HDRC controls CPEN, but beware current surges during device
* connect. They can trigger transient overcurrent conditions
* that must be ignored.
*/
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (is_on) {
if (musb->xceiv->state == OTG_STATE_A_IDLE) {
int loops = 100;
/* start the session */
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
/*
* Wait for the musb to set as A device to enable the
* VBUS
*/
while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {
mdelay(5);
cpu_relax();
if (time_after(jiffies, timeout)
|| loops-- <= 0) {
dev_err(musb->controller,
"configured as A device timeout");
break;
}
}
otg_set_vbus(otg, 1);
} else {
musb->is_active = 1;
otg->default_a = 1;
musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
devctl |= MUSB_DEVCTL_SESSION;
MUSB_HST_MODE(musb);
}
} else {
musb->is_active = 0;
/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
* jumping right to B_IDLE...
*/
otg->default_a = 0;
musb->xceiv->state = OTG_STATE_B_IDLE;
devctl &= ~MUSB_DEVCTL_SESSION;
MUSB_DEV_MODE(musb);
}
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
dev_dbg(musb->controller, "VBUS %s, devctl %02x "
/* otg %3x conf %08x prcm %08x */ "\n",
usb_otg_state_string(musb->xceiv->state),
musb_readb(musb->mregs, MUSB_DEVCTL));
}
static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode)
{
u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
return 0;
}
static inline void omap2430_low_level_exit(struct musb *musb)
{
u32 l;
/* in any role */
l = musb_readl(musb->mregs, OTG_FORCESTDBY);
l |= ENABLEFORCE; /* enable MSTANDBY */
musb_writel(musb->mregs, OTG_FORCESTDBY, l);
}
static inline void omap2430_low_level_init(struct musb *musb)
{
u32 l;
l = musb_readl(musb->mregs, OTG_FORCESTDBY);
l &= ~ENABLEFORCE; /* disable MSTANDBY */
musb_writel(musb->mregs, OTG_FORCESTDBY, l);
}
void omap_musb_mailbox(enum omap_musb_vbus_id_status status)
{
struct omap2430_glue *glue = _glue;
if (!glue) {
pr_err("%s: musb core is not yet initialized\n", __func__);
return;
}
glue->status = status;
if (!glue_to_musb(glue)) {
pr_err("%s: musb core is not yet ready\n", __func__);
return;
}
schedule_work(&glue->omap_musb_mailbox_work);
}
EXPORT_SYMBOL_GPL(omap_musb_mailbox);
static void omap_musb_set_mailbox(struct omap2430_glue *glue)
{
struct musb *musb = glue_to_musb(glue);
struct device *dev = musb->controller;
struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
struct omap_musb_board_data *data = pdata->board_data;
struct usb_otg *otg = musb->xceiv->otg;
switch (glue->status) {
case OMAP_MUSB_ID_GROUND:
dev_dbg(dev, "ID GND\n");
otg->default_a = true;
musb->xceiv->state = OTG_STATE_A_IDLE;
musb->xceiv->last_event = USB_EVENT_ID;
if (musb->gadget_driver) {
pm_runtime_get_sync(dev);
omap_control_usb_set_mode(glue->control_otghs,
USB_MODE_HOST);
omap2430_musb_set_vbus(musb, 1);
}
break;
case OMAP_MUSB_VBUS_VALID:
dev_dbg(dev, "VBUS Connect\n");
otg->default_a = false;
musb->xceiv->state = OTG_STATE_B_IDLE;
musb->xceiv->last_event = USB_EVENT_VBUS;
if (musb->gadget_driver)
pm_runtime_get_sync(dev);
omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
break;
case OMAP_MUSB_ID_FLOAT:
case OMAP_MUSB_VBUS_OFF:
dev_dbg(dev, "VBUS Disconnect\n");
musb->xceiv->last_event = USB_EVENT_NONE;
if (musb->gadget_driver) {
omap2430_musb_set_vbus(musb, 0);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
if (data->interface_type == MUSB_INTERFACE_UTMI)
otg_set_vbus(musb->xceiv->otg, 0);
omap_control_usb_set_mode(glue->control_otghs,
USB_MODE_DISCONNECT);
break;
default:
dev_dbg(dev, "ID float\n");
}
atomic_notifier_call_chain(&musb->xceiv->notifier,
musb->xceiv->last_event, NULL);
}
static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
{
struct omap2430_glue *glue = container_of(mailbox_work,
struct omap2430_glue, omap_musb_mailbox_work);
struct musb *musb = glue_to_musb(glue);
struct device *dev = musb->controller;
pm_runtime_get_sync(dev);
omap_musb_set_mailbox(glue);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
spin_lock_irqsave(&musb->lock, flags);
musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
if (musb->int_usb || musb->int_tx || musb->int_rx)
retval = musb_interrupt(musb);
spin_unlock_irqrestore(&musb->lock, flags);
return retval;
}
static int omap2430_musb_init(struct musb *musb)
{
u32 l;
int status = 0;
struct device *dev = musb->controller;
struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
struct omap_musb_board_data *data = plat->board_data;
/* We require some kind of external transceiver, hooked
* up through ULPI. TWL4030-family PMICs include one,
* which needs a driver, drivers aren't always needed.
*/
if (dev->parent->of_node) {
musb->phy = devm_phy_get(dev->parent, "usb2-phy");
/* We can't totally remove musb->xceiv as of now because
* musb core uses xceiv.state and xceiv.otg. Once we have
* a separate state machine to handle otg, these can be moved
* out of xceiv and then we can start using the generic PHY
* framework
*/
musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent,
"usb-phy", 0);
} else {
musb->xceiv = devm_usb_get_phy_dev(dev, 0);
musb->phy = devm_phy_get(dev, "usb");
}
if (IS_ERR(musb->xceiv)) {
status = PTR_ERR(musb->xceiv);
if (status == -ENXIO)
return status;
pr_err("HS USB OTG: no transceiver configured\n");
return -EPROBE_DEFER;
}
if (IS_ERR(musb->phy)) {
pr_err("HS USB OTG: no PHY configured\n");
return PTR_ERR(musb->phy);
}
musb->isr = omap2430_musb_interrupt;
status = pm_runtime_get_sync(dev);
if (status < 0) {
dev_err(dev, "pm_runtime_get_sync FAILED %d\n", status);
goto err1;
}
l = musb_readl(musb->mregs, OTG_INTERFSEL);
if (data->interface_type == MUSB_INTERFACE_UTMI) {
/* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
l &= ~ULPI_12PIN; /* Disable ULPI */
l |= UTMI_8BIT; /* Enable UTMI */
} else {
l |= ULPI_12PIN;
}
musb_writel(musb->mregs, OTG_INTERFSEL, l);
pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
"sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
musb_readl(musb->mregs, OTG_REVISION),
musb_readl(musb->mregs, OTG_SYSCONFIG),
musb_readl(musb->mregs, OTG_SYSSTATUS),
musb_readl(musb->mregs, OTG_INTERFSEL),
musb_readl(musb->mregs, OTG_SIMENABLE));
setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
if (glue->status != OMAP_MUSB_UNKNOWN)
omap_musb_set_mailbox(glue);
phy_init(musb->phy);
phy_power_on(musb->phy);
pm_runtime_put_noidle(musb->controller);
return 0;
err1:
return status;
}
static void omap2430_musb_enable(struct musb *musb)
{
u8 devctl;
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
struct device *dev = musb->controller;
struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
struct omap_musb_board_data *data = pdata->board_data;
switch (glue->status) {
case OMAP_MUSB_ID_GROUND:
omap_control_usb_set_mode(glue->control_otghs, USB_MODE_HOST);
if (data->interface_type != MUSB_INTERFACE_UTMI)
break;
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
/* start the session */
devctl |= MUSB_DEVCTL_SESSION;
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
while (musb_readb(musb->mregs, MUSB_DEVCTL) &
MUSB_DEVCTL_BDEVICE) {
cpu_relax();
if (time_after(jiffies, timeout)) {
dev_err(dev, "configured as A device timeout");
break;
}
}
break;
case OMAP_MUSB_VBUS_VALID:
omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
break;
default:
break;
}
}
static void omap2430_musb_disable(struct musb *musb)
{
struct device *dev = musb->controller;
struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
if (glue->status != OMAP_MUSB_UNKNOWN)
omap_control_usb_set_mode(glue->control_otghs,
USB_MODE_DISCONNECT);
}
static int omap2430_musb_exit(struct musb *musb)
{
del_timer_sync(&musb_idle_timer);
omap2430_low_level_exit(musb);
phy_power_off(musb->phy);
phy_exit(musb->phy);
return 0;
}
static const struct musb_platform_ops omap2430_ops = {
.init = omap2430_musb_init,
.exit = omap2430_musb_exit,
.set_mode = omap2430_musb_set_mode,
.try_idle = omap2430_musb_try_idle,
.set_vbus = omap2430_musb_set_vbus,
.enable = omap2430_musb_enable,
.disable = omap2430_musb_disable,
};
static u64 omap2430_dmamask = DMA_BIT_MASK(32);
static int omap2430_probe(struct platform_device *pdev)
{
struct resource musb_resources[3];
struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct omap_musb_board_data *data;
struct platform_device *musb;
struct omap2430_glue *glue;
struct device_node *np = pdev->dev.of_node;
struct musb_hdrc_config *config;
int ret = -ENOMEM;
glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&pdev->dev, "failed to allocate glue context\n");
goto err0;
}
musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
if (!musb) {
dev_err(&pdev->dev, "failed to allocate musb device\n");
goto err0;
}
musb->dev.parent = &pdev->dev;
musb->dev.dma_mask = &omap2430_dmamask;
musb->dev.coherent_dma_mask = omap2430_dmamask;
glue->dev = &pdev->dev;
glue->musb = musb;
glue->status = OMAP_MUSB_UNKNOWN;
glue->control_otghs = ERR_PTR(-ENODEV);
if (np) {
struct device_node *control_node;
struct platform_device *control_pdev;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev,
"failed to allocate musb platform data\n");
goto err2;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev,
"failed to allocate musb board data\n");
goto err2;
}
config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
if (!config) {
dev_err(&pdev->dev,
"failed to allocate musb hdrc config\n");
goto err2;
}
of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
of_property_read_u32(np, "interface-type",
(u32 *)&data->interface_type);
of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
of_property_read_u32(np, "power", (u32 *)&pdata->power);
config->multipoint = of_property_read_bool(np, "multipoint");
pdata->board_data = data;
pdata->config = config;
control_node = of_parse_phandle(np, "ctrl-module", 0);
if (control_node) {
control_pdev = of_find_device_by_node(control_node);
if (!control_pdev) {
dev_err(&pdev->dev, "Failed to get control device\n");
ret = -EINVAL;
goto err2;
}
glue->control_otghs = &control_pdev->dev;
}
}
pdata->platform_ops = &omap2430_ops;
platform_set_drvdata(pdev, glue);
/*
* REVISIT if we ever have two instances of the wrapper, we will be
* in big trouble
*/
_glue = glue;
INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
memset(musb_resources, 0x00, sizeof(*musb_resources) *
ARRAY_SIZE(musb_resources));
musb_resources[0].name = pdev->resource[0].name;
musb_resources[0].start = pdev->resource[0].start;
musb_resources[0].end = pdev->resource[0].end;
musb_resources[0].flags = pdev->resource[0].flags;
musb_resources[1].name = pdev->resource[1].name;
musb_resources[1].start = pdev->resource[1].start;
musb_resources[1].end = pdev->resource[1].end;
musb_resources[1].flags = pdev->resource[1].flags;
musb_resources[2].name = pdev->resource[2].name;
musb_resources[2].start = pdev->resource[2].start;
musb_resources[2].end = pdev->resource[2].end;
musb_resources[2].flags = pdev->resource[2].flags;
ret = platform_device_add_resources(musb, musb_resources,
ARRAY_SIZE(musb_resources));
if (ret) {
dev_err(&pdev->dev, "failed to add resources\n");
goto err2;
}
ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
if (ret) {
dev_err(&pdev->dev, "failed to add platform_data\n");
goto err2;
}
pm_runtime_enable(&pdev->dev);
ret = platform_device_add(musb);
if (ret) {
dev_err(&pdev->dev, "failed to register musb device\n");
goto err2;
}
return 0;
err2:
platform_device_put(musb);
err0:
return ret;
}
static int omap2430_remove(struct platform_device *pdev)
{
struct omap2430_glue *glue = platform_get_drvdata(pdev);
cancel_work_sync(&glue->omap_musb_mailbox_work);
platform_device_unregister(glue->musb);
return 0;
}
#ifdef CONFIG_PM
static int omap2430_runtime_suspend(struct device *dev)
{
struct omap2430_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
if (musb) {
musb->context.otg_interfsel = musb_readl(musb->mregs,
OTG_INTERFSEL);
omap2430_low_level_exit(musb);
}
return 0;
}
static int omap2430_runtime_resume(struct device *dev)
{
struct omap2430_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
if (musb) {
omap2430_low_level_init(musb);
musb_writel(musb->mregs, OTG_INTERFSEL,
musb->context.otg_interfsel);
}
return 0;
}
static struct dev_pm_ops omap2430_pm_ops = {
.runtime_suspend = omap2430_runtime_suspend,
.runtime_resume = omap2430_runtime_resume,
};
#define DEV_PM_OPS (&omap2430_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif
#ifdef CONFIG_OF
static const struct of_device_id omap2430_id_table[] = {
{
.compatible = "ti,omap4-musb"
},
{
.compatible = "ti,omap3-musb"
},
{},
};
MODULE_DEVICE_TABLE(of, omap2430_id_table);
#endif
static struct platform_driver omap2430_driver = {
.probe = omap2430_probe,
.remove = omap2430_remove,
.driver = {
.name = "musb-omap2430",
.pm = DEV_PM_OPS,
.of_match_table = of_match_ptr(omap2430_id_table),
},
};
MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
static int __init omap2430_init(void)
{
return platform_driver_register(&omap2430_driver);
}
subsys_initcall(omap2430_init);
static void __exit omap2430_exit(void)
{
platform_driver_unregister(&omap2430_driver);
}
module_exit(omap2430_exit);