linux/drivers/usb/phy/phy-mxs-usb.c
Felipe Balbi c139e1425f Linux 3.13-rc4
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.15 (GNU/Linux)
 
 iQEcBAABAgAGBQJSrhGrAAoJEHm+PkMAQRiGsNoH/jIK3CsQ2lbW7yRLXmfgtbzz
 i2Kep6D4SDvmaLpLYOVC8xNYTiE8jtTbSXHomwP5wMZ63MQDhBfnEWsEWqeZ9+D9
 3Q46p0QWuoBgYu2VGkoxTfygkT6hhSpwWIi3SeImbY4fg57OHiUil/+YGhORM4Qc
 K4549OCTY3sIrgmWL77gzqjRUo+pQ4C73NKqZ3+5nlOmYBZC1yugk8mFwEpQkwhK
 4NRNU760Fo+XIht/bINqRiPMddzC15p0mxvJy3cDW8bZa1tFSS9SB7AQUULBbcHL
 +2dFlFOEb5SV1sNiNPrJ0W+h2qUh2e7kPB0F8epaBppgbwVdyQoC2u4uuLV2ZN0=
 =lI2r
 -----END PGP SIGNATURE-----

Merge tag 'v3.13-rc4' into next

Linux 3.13-rc4

* tag 'v3.13-rc4': (1001 commits)
  Linux 3.13-rc4
  null_blk: mem garbage on NUMA systems during init
  radeon_pm: fix oops in hwmon_attributes_visible() and radeon_hwmon_show_temp_thresh()
  Revert "selinux: consider filesystem subtype in policies"
  igb: Fix for issue where values could be too high for udelay function.
  i40e: fix null dereference
  ARM: fix asm/memory.h build error
  dm array: fix a reference counting bug in shadow_ablock
  dm space map: disallow decrementing a reference count below zero
  mm: memcg: do not allow task about to OOM kill to bypass the limit
  mm: memcg: fix race condition between memcg teardown and swapin
  thp: move preallocated PTE page table on move_huge_pmd()
  mfd/rtc: s5m: fix register updating by adding regmap for RTC
  rtc: s5m: enable IRQ wake during suspend
  rtc: s5m: limit endless loop waiting for register update
  rtc: s5m: fix unsuccesful IRQ request during probe
  drivers/rtc/rtc-s5m.c: fix info->rtc assignment
  include/linux/kernel.h: make might_fault() a nop for !MMU
  drivers/rtc/rtc-at91rm9200.c: correct alarm over day/month wrap
  procfs: also fix proc_reg_get_unmapped_area() for !MMU case
  ...

Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-12-19 09:18:53 -06:00

223 lines
5.2 KiB
C

/*
* Copyright 2012 Freescale Semiconductor, Inc.
* Copyright (C) 2012 Marek Vasut <marex@denx.de>
* on behalf of DENX Software Engineering GmbH
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/stmp_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#define DRIVER_NAME "mxs_phy"
#define HW_USBPHY_PWD 0x00
#define HW_USBPHY_CTRL 0x30
#define HW_USBPHY_CTRL_SET 0x34
#define HW_USBPHY_CTRL_CLR 0x38
#define BM_USBPHY_CTRL_SFTRST BIT(31)
#define BM_USBPHY_CTRL_CLKGATE BIT(30)
#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
struct mxs_phy {
struct usb_phy phy;
struct clk *clk;
};
#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
{
int ret;
void __iomem *base = mxs_phy->phy.io_priv;
ret = stmp_reset_block(base + HW_USBPHY_CTRL);
if (ret)
return ret;
/* Power up the PHY */
writel(0, base + HW_USBPHY_PWD);
/* enable FS/LS device */
writel(BM_USBPHY_CTRL_ENUTMILEVEL2 |
BM_USBPHY_CTRL_ENUTMILEVEL3,
base + HW_USBPHY_CTRL_SET);
return 0;
}
static int mxs_phy_init(struct usb_phy *phy)
{
int ret;
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
ret = clk_prepare_enable(mxs_phy->clk);
if (ret)
return ret;
return mxs_phy_hw_init(mxs_phy);
}
static void mxs_phy_shutdown(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
writel(BM_USBPHY_CTRL_CLKGATE,
phy->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);
}
static int mxs_phy_suspend(struct usb_phy *x, int suspend)
{
int ret;
struct mxs_phy *mxs_phy = to_mxs_phy(x);
if (suspend) {
writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);
} else {
ret = clk_prepare_enable(mxs_phy->clk);
if (ret)
return ret;
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_CLR);
writel(0, x->io_priv + HW_USBPHY_PWD);
}
return 0;
}
static int mxs_phy_on_connect(struct usb_phy *phy,
enum usb_device_speed speed)
{
dev_dbg(phy->dev, "%s speed device has connected\n",
(speed == USB_SPEED_HIGH) ? "high" : "non-high");
if (speed == USB_SPEED_HIGH)
writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_SET);
return 0;
}
static int mxs_phy_on_disconnect(struct usb_phy *phy,
enum usb_device_speed speed)
{
dev_dbg(phy->dev, "%s speed device has disconnected\n",
(speed == USB_SPEED_HIGH) ? "high" : "non-high");
if (speed == USB_SPEED_HIGH)
writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
phy->io_priv + HW_USBPHY_CTRL_CLR);
return 0;
}
static int mxs_phy_probe(struct platform_device *pdev)
{
struct resource *res;
void __iomem *base;
struct clk *clk;
struct mxs_phy *mxs_phy;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev,
"can't get the clock, err=%ld", PTR_ERR(clk));
return PTR_ERR(clk);
}
mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
if (!mxs_phy) {
dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
return -ENOMEM;
}
mxs_phy->phy.io_priv = base;
mxs_phy->phy.dev = &pdev->dev;
mxs_phy->phy.label = DRIVER_NAME;
mxs_phy->phy.init = mxs_phy_init;
mxs_phy->phy.shutdown = mxs_phy_shutdown;
mxs_phy->phy.set_suspend = mxs_phy_suspend;
mxs_phy->phy.notify_connect = mxs_phy_on_connect;
mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
mxs_phy->phy.type = USB_PHY_TYPE_USB2;
mxs_phy->clk = clk;
platform_set_drvdata(pdev, mxs_phy);
ret = usb_add_phy_dev(&mxs_phy->phy);
if (ret)
return ret;
return 0;
}
static int mxs_phy_remove(struct platform_device *pdev)
{
struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
usb_remove_phy(&mxs_phy->phy);
return 0;
}
static const struct of_device_id mxs_phy_dt_ids[] = {
{ .compatible = "fsl,imx23-usbphy", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
static struct platform_driver mxs_phy_driver = {
.probe = mxs_phy_probe,
.remove = mxs_phy_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = mxs_phy_dt_ids,
},
};
static int __init mxs_phy_module_init(void)
{
return platform_driver_register(&mxs_phy_driver);
}
postcore_initcall(mxs_phy_module_init);
static void __exit mxs_phy_module_exit(void)
{
platform_driver_unregister(&mxs_phy_driver);
}
module_exit(mxs_phy_module_exit);
MODULE_ALIAS("platform:mxs-usb-phy");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
MODULE_LICENSE("GPL");