linux/drivers/usb/host/ehci-mxc.c
Sascha Hauer 4bd597b633 ARM i.MX ehci: do ehci init in board specific functions
The mxc-ehci driver calls SoC specific phy initialization right after
calling board specific initialization. To offer greater flexibility for
boards to setup the phy and to get rid of some unnecessary flags in
platform data this patch lets the boards call the SoC specific phy
initialization and remove it from the driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2011-02-11 08:40:45 +01:00

342 lines
7.7 KiB
C

/*
* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*
* 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/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/slab.h>
#include <mach/mxc_ehci.h>
#include <asm/mach-types.h>
#define ULPI_VIEWPORT_OFFSET 0x170
struct ehci_mxc_priv {
struct clk *usbclk, *ahbclk, *phy1clk;
struct usb_hcd *hcd;
};
/* called during probe() after chip reset completes */
static int ehci_mxc_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
hcd->has_tt = 1;
retval = ehci_halt(ehci);
if (retval)
return retval;
/* data structure init */
retval = ehci_init(hcd);
if (retval)
return retval;
ehci->sbrn = 0x20;
ehci_reset(ehci);
ehci_port_power(ehci, 0);
return 0;
}
static const struct hc_driver ehci_mxc_hc_driver = {
.description = hcd_name,
.product_desc = "Freescale On-Chip EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_USB2 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.reset = ehci_mxc_setup,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_mxc_drv_probe(struct platform_device *pdev)
{
struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
struct usb_hcd *hcd;
struct resource *res;
int irq, ret;
unsigned int flags;
struct ehci_mxc_priv *priv;
struct device *dev = &pdev->dev;
struct ehci_hcd *ehci;
dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
if (!pdata) {
dev_err(dev, "No platform data given, bailing out.\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
if (!hcd)
return -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto err_alloc;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "Found HC with no register addr. Check setup!\n");
ret = -ENODEV;
goto err_get_resource;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(dev, "controller already in use\n");
ret = -EBUSY;
goto err_request_mem;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(dev, "error mapping memory\n");
ret = -EFAULT;
goto err_ioremap;
}
/* enable clocks */
priv->usbclk = clk_get(dev, "usb");
if (IS_ERR(priv->usbclk)) {
ret = PTR_ERR(priv->usbclk);
goto err_clk;
}
clk_enable(priv->usbclk);
if (!cpu_is_mx35() && !cpu_is_mx25()) {
priv->ahbclk = clk_get(dev, "usb_ahb");
if (IS_ERR(priv->ahbclk)) {
ret = PTR_ERR(priv->ahbclk);
goto err_clk_ahb;
}
clk_enable(priv->ahbclk);
}
/* "dr" device has its own clock on i.MX51 */
if (cpu_is_mx51() && (pdev->id == 0)) {
priv->phy1clk = clk_get(dev, "usb_phy1");
if (IS_ERR(priv->phy1clk)) {
ret = PTR_ERR(priv->phy1clk);
goto err_clk_phy;
}
clk_enable(priv->phy1clk);
}
/* call platform specific init function */
if (pdata->init) {
ret = pdata->init(pdev);
if (ret) {
dev_err(dev, "platform init failed\n");
goto err_init;
}
/* platforms need some time to settle changed IO settings */
mdelay(10);
}
ehci = hcd_to_ehci(hcd);
/* EHCI registers start at offset 0x100 */
ehci->caps = hcd->regs + 0x100;
ehci->regs = hcd->regs + 0x100 +
HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
/* set up the PORTSCx register */
ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
/* is this really needed? */
msleep(10);
/* Initialize the transceiver */
if (pdata->otg) {
pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
ret = otg_init(pdata->otg);
if (ret) {
dev_err(dev, "unable to init transceiver, probably missing\n");
ret = -ENODEV;
goto err_add;
}
ret = otg_set_vbus(pdata->otg, 1);
if (ret) {
dev_err(dev, "unable to enable vbus on transceiver\n");
goto err_add;
}
}
priv->hcd = hcd;
platform_set_drvdata(pdev, priv);
ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
if (ret)
goto err_add;
if (pdata->otg) {
/*
* efikamx and efikasb have some hardware bug which is
* preventing usb to work unless CHRGVBUS is set.
* It's in violation of USB specs
*/
if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) {
flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL);
flags |= ULPI_OTG_CTRL_CHRGVBUS;
ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL);
if (ret) {
dev_err(dev, "unable to set CHRVBUS\n");
goto err_add;
}
}
}
return 0;
err_add:
if (pdata && pdata->exit)
pdata->exit(pdev);
err_init:
if (priv->phy1clk) {
clk_disable(priv->phy1clk);
clk_put(priv->phy1clk);
}
err_clk_phy:
if (priv->ahbclk) {
clk_disable(priv->ahbclk);
clk_put(priv->ahbclk);
}
err_clk_ahb:
clk_disable(priv->usbclk);
clk_put(priv->usbclk);
err_clk:
iounmap(hcd->regs);
err_ioremap:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_request_mem:
err_get_resource:
kfree(priv);
err_alloc:
usb_put_hcd(hcd);
return ret;
}
static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
{
struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
struct usb_hcd *hcd = priv->hcd;
if (pdata && pdata->exit)
pdata->exit(pdev);
if (pdata->otg)
otg_shutdown(pdata->otg);
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
platform_set_drvdata(pdev, NULL);
clk_disable(priv->usbclk);
clk_put(priv->usbclk);
if (priv->ahbclk) {
clk_disable(priv->ahbclk);
clk_put(priv->ahbclk);
}
if (priv->phy1clk) {
clk_disable(priv->phy1clk);
clk_put(priv->phy1clk);
}
kfree(priv);
return 0;
}
static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
{
struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
struct usb_hcd *hcd = priv->hcd;
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
}
MODULE_ALIAS("platform:mxc-ehci");
static struct platform_driver ehci_mxc_driver = {
.probe = ehci_mxc_drv_probe,
.remove = __exit_p(ehci_mxc_drv_remove),
.shutdown = ehci_mxc_drv_shutdown,
.driver = {
.name = "mxc-ehci",
},
};