- 根目录:
- drivers
- usb
- musb
- ux500.c
/*
* Copyright (C) 2010 ST-Ericsson AB
* Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
*
* Based on omap2430.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/musb-ux500.h>
#include "musb_core.h"
static struct musb_hdrc_config ux500_musb_hdrc_config = {
.multipoint = true,
.dyn_fifo = true,
.num_eps = 16,
.ram_bits = 16,
};
struct ux500_glue {
struct device *dev;
struct platform_device *musb;
struct clk *clk;
};
#define glue_to_musb(g) platform_get_drvdata(g->musb)
static void ux500_musb_set_vbus(struct musb *musb, int is_on)
{
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) {
/* 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) {
if (time_after(jiffies, timeout)) {
dev_err(musb->controller,
"configured as A device timeout");
break;
}
}
} else {
musb->is_active = 1;
musb->xceiv->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...
*/
musb->xceiv->otg->default_a = 0;
devctl &= ~MUSB_DEVCTL_SESSION;
MUSB_DEV_MODE(musb);
}
musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
/*
* Devctl values will be updated after vbus goes below
* session_valid. The time taken depends on the capacitance
* on VBUS line. The max discharge time can be upto 1 sec
* as per the spec. Typically on our platform, it is 200ms
*/
if (!is_on)
mdelay(200);
dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
usb_otg_state_string(musb->xceiv->state),
musb_readb(musb->mregs, MUSB_DEVCTL));
}
static int musb_otg_notifications(struct notifier_block *nb,
unsigned long event, void *unused)
{
struct musb *musb = container_of(nb, struct musb, nb);
dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
event, usb_otg_state_string(musb->xceiv->state));
switch (event) {
case UX500_MUSB_ID:
dev_dbg(musb->controller, "ID GND\n");
ux500_musb_set_vbus(musb, 1);
break;
case UX500_MUSB_VBUS:
dev_dbg(musb->controller, "VBUS Connect\n");
break;
case UX500_MUSB_NONE:
dev_dbg(musb->controller, "VBUS Disconnect\n");
if (is_host_active(musb))
ux500_musb_set_vbus(musb, 0);
else
musb->xceiv->state = OTG_STATE_B_IDLE;
break;
default:
dev_dbg(musb->controller, "ID float\n");
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static irqreturn_t ux500_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 ux500_musb_init(struct musb *musb)
{
int status;
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv)) {
pr_err("HS USB OTG: no transceiver configured\n");
return -EPROBE_DEFER;
}
musb->nb.notifier_call = musb_otg_notifications;
status = usb_register_notifier(musb->xceiv, &musb->nb);
if (status < 0) {
dev_dbg(musb->controller, "notification register failed\n");
return status;
}
musb->isr = ux500_musb_interrupt;
return 0;
}
static int ux500_musb_exit(struct musb *musb)
{
usb_unregister_notifier(musb->xceiv, &musb->nb);
usb_put_phy(musb->xceiv);
return 0;
}
static const struct musb_platform_ops ux500_ops = {
.init = ux500_musb_init,
.exit = ux500_musb_exit,
.set_vbus = ux500_musb_set_vbus,
};
static struct musb_hdrc_platform_data *
ux500_of_probe(struct platform_device *pdev, struct device_node *np)
{
struct musb_hdrc_platform_data *pdata;
const char *mode;
int strlen;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
mode = of_get_property(np, "dr_mode", &strlen);
if (!mode) {
dev_err(&pdev->dev, "No 'dr_mode' property found\n");
return NULL;
}
if (strlen > 0) {
if (!strcmp(mode, "host"))
pdata->mode = MUSB_HOST;
if (!strcmp(mode, "otg"))
pdata->mode = MUSB_OTG;
if (!strcmp(mode, "peripheral"))
pdata->mode = MUSB_PERIPHERAL;
}
return pdata;
}
static int ux500_probe(struct platform_device *pdev)
{
struct resource musb_resources[2];
struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct platform_device *musb;
struct ux500_glue *glue;
struct clk *clk;
int ret = -ENOMEM;
if (!pdata) {
if (np) {
pdata = ux500_of_probe(pdev, np);
if (!pdata)
goto err0;
pdev->dev.platform_data = pdata;
} else {
dev_err(&pdev->dev, "no pdata or device tree found\n");
goto err0;
}
}
glue = kzalloc(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 err1;
}
clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
ret = PTR_ERR(clk);
goto err3;
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
goto err4;
}
musb->dev.parent = &pdev->dev;
musb->dev.dma_mask = &pdev->dev.coherent_dma_mask;
musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
musb->dev.of_node = pdev->dev.of_node;
glue->dev = &pdev->dev;
glue->musb = musb;
glue->clk = clk;
pdata->platform_ops = &ux500_ops;
pdata->config = &ux500_musb_hdrc_config;
platform_set_drvdata(pdev, glue);
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;
ret = platform_device_add_resources(musb, musb_resources,
ARRAY_SIZE(musb_resources));
if (ret) {
dev_err(&pdev->dev, "failed to add resources\n");
goto err5;
}
ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
if (ret) {
dev_err(&pdev->dev, "failed to add platform_data\n");
goto err5;
}
ret = platform_device_add(musb);
if (ret) {
dev_err(&pdev->dev, "failed to register musb device\n");
goto err5;
}
return 0;
err5:
clk_disable_unprepare(clk);
err4:
clk_put(clk);
err3:
platform_device_put(musb);
err1:
kfree(glue);
err0:
return ret;
}
static int ux500_remove(struct platform_device *pdev)
{
struct ux500_glue *glue = platform_get_drvdata(pdev);
platform_device_unregister(glue->musb);
clk_disable_unprepare(glue->clk);
clk_put(glue->clk);
kfree(glue);
return 0;
}
#ifdef CONFIG_PM
static int ux500_suspend(struct device *dev)
{
struct ux500_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
usb_phy_set_suspend(musb->xceiv, 1);
clk_disable_unprepare(glue->clk);
return 0;
}
static int ux500_resume(struct device *dev)
{
struct ux500_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
int ret;
ret = clk_prepare_enable(glue->clk);
if (ret) {
dev_err(dev, "failed to enable clock\n");
return ret;
}
usb_phy_set_suspend(musb->xceiv, 0);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);
static const struct of_device_id ux500_match[] = {
{ .compatible = "stericsson,db8500-musb", },
{}
};
static struct platform_driver ux500_driver = {
.probe = ux500_probe,
.remove = ux500_remove,
.driver = {
.name = "musb-ux500",
.pm = &ux500_pm_ops,
.of_match_table = ux500_match,
},
};
MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
MODULE_LICENSE("GPL v2");
module_platform_driver(ux500_driver);