291 lines
7.5 KiB
C
291 lines
7.5 KiB
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 version 2.
|
||
|
|
*
|
||
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
||
|
|
* kind, whether express or implied; without even the implied warranty
|
||
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/regmap.h>
|
||
|
|
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/usb/phy_companion.h>
|
||
|
|
#include <linux/clk.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/pm_runtime.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/phy/phy.h>
|
||
|
|
#include <linux/of_platform.h>
|
||
|
|
|
||
|
|
#include <linux/mfd/syscon.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TRM has two sets of USB_CTRL registers.. The correct register bits
|
||
|
|
* are in TRM section 24.9.8.2 USB_CTRL Register. The TRM documents the
|
||
|
|
* phy as being SR70LX Synopsys USB 2.0 OTG nanoPHY. It also seems at
|
||
|
|
* least dm816x rev c ignores writes to USB_CTRL register, but the TI
|
||
|
|
* kernel is writing to those so it's possible that later revisions
|
||
|
|
* have worknig USB_CTRL register.
|
||
|
|
*
|
||
|
|
* Also note that At least USB_CTRL register seems to be dm816x specific
|
||
|
|
* according to the TRM. It's possible that USBPHY_CTRL is more generic,
|
||
|
|
* but that would have to be checked against the SR70LX documentation
|
||
|
|
* which does not seem to be publicly available.
|
||
|
|
*
|
||
|
|
* Finally, the phy on dm814x and am335x is different from dm816x.
|
||
|
|
*/
|
||
|
|
#define DM816X_USB_CTRL_PHYCLKSRC BIT(8) /* 1 = PLL ref clock */
|
||
|
|
#define DM816X_USB_CTRL_PHYSLEEP1 BIT(1) /* Enable the first phy */
|
||
|
|
#define DM816X_USB_CTRL_PHYSLEEP0 BIT(0) /* Enable the second phy */
|
||
|
|
|
||
|
|
#define DM816X_USBPHY_CTRL_TXRISETUNE 1
|
||
|
|
#define DM816X_USBPHY_CTRL_TXVREFTUNE 0xc
|
||
|
|
#define DM816X_USBPHY_CTRL_TXPREEMTUNE 0x2
|
||
|
|
|
||
|
|
struct dm816x_usb_phy {
|
||
|
|
struct regmap *syscon;
|
||
|
|
struct device *dev;
|
||
|
|
unsigned int instance;
|
||
|
|
struct clk *refclk;
|
||
|
|
struct usb_phy phy;
|
||
|
|
unsigned int usb_ctrl; /* Shared between phy0 and phy1 */
|
||
|
|
unsigned int usbphy_ctrl;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int dm816x_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
|
||
|
|
{
|
||
|
|
otg->host = host;
|
||
|
|
if (!host)
|
||
|
|
otg->state = OTG_STATE_UNDEFINED;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dm816x_usb_phy_set_peripheral(struct usb_otg *otg,
|
||
|
|
struct usb_gadget *gadget)
|
||
|
|
{
|
||
|
|
otg->gadget = gadget;
|
||
|
|
if (!gadget)
|
||
|
|
otg->state = OTG_STATE_UNDEFINED;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dm816x_usb_phy_init(struct phy *x)
|
||
|
|
{
|
||
|
|
struct dm816x_usb_phy *phy = phy_get_drvdata(x);
|
||
|
|
unsigned int val;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
if (clk_get_rate(phy->refclk) != 24000000)
|
||
|
|
dev_warn(phy->dev, "nonstandard phy refclk\n");
|
||
|
|
|
||
|
|
/* Set PLL ref clock and put phys to sleep */
|
||
|
|
error = regmap_update_bits(phy->syscon, phy->usb_ctrl,
|
||
|
|
DM816X_USB_CTRL_PHYCLKSRC |
|
||
|
|
DM816X_USB_CTRL_PHYSLEEP1 |
|
||
|
|
DM816X_USB_CTRL_PHYSLEEP0,
|
||
|
|
0);
|
||
|
|
regmap_read(phy->syscon, phy->usb_ctrl, &val);
|
||
|
|
if ((val & 3) != 0)
|
||
|
|
dev_info(phy->dev,
|
||
|
|
"Working dm816x USB_CTRL! (0x%08x)\n",
|
||
|
|
val);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TI kernel sets these values for "symmetrical eye diagram and
|
||
|
|
* better signal quality" so let's assume somebody checked the
|
||
|
|
* values with a scope and set them here too.
|
||
|
|
*/
|
||
|
|
regmap_read(phy->syscon, phy->usbphy_ctrl, &val);
|
||
|
|
val |= DM816X_USBPHY_CTRL_TXRISETUNE |
|
||
|
|
DM816X_USBPHY_CTRL_TXVREFTUNE |
|
||
|
|
DM816X_USBPHY_CTRL_TXPREEMTUNE;
|
||
|
|
regmap_write(phy->syscon, phy->usbphy_ctrl, val);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct phy_ops ops = {
|
||
|
|
.init = dm816x_usb_phy_init,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __maybe_unused dm816x_usb_phy_runtime_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct dm816x_usb_phy *phy = dev_get_drvdata(dev);
|
||
|
|
unsigned int mask, val;
|
||
|
|
int error = 0;
|
||
|
|
|
||
|
|
mask = BIT(phy->instance);
|
||
|
|
val = ~BIT(phy->instance);
|
||
|
|
error = regmap_update_bits(phy->syscon, phy->usb_ctrl,
|
||
|
|
mask, val);
|
||
|
|
if (error)
|
||
|
|
dev_err(phy->dev, "phy%i failed to power off\n",
|
||
|
|
phy->instance);
|
||
|
|
clk_disable(phy->refclk);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __maybe_unused dm816x_usb_phy_runtime_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
struct dm816x_usb_phy *phy = dev_get_drvdata(dev);
|
||
|
|
unsigned int mask, val;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
error = clk_enable(phy->refclk);
|
||
|
|
if (error)
|
||
|
|
return error;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Note that at least dm816x rev c does not seem to do
|
||
|
|
* anything with the USB_CTRL register. But let's follow
|
||
|
|
* what the TI tree is doing in case later revisions use
|
||
|
|
* USB_CTRL.
|
||
|
|
*/
|
||
|
|
mask = BIT(phy->instance);
|
||
|
|
val = BIT(phy->instance);
|
||
|
|
error = regmap_update_bits(phy->syscon, phy->usb_ctrl,
|
||
|
|
mask, val);
|
||
|
|
if (error) {
|
||
|
|
dev_err(phy->dev, "phy%i failed to power on\n",
|
||
|
|
phy->instance);
|
||
|
|
clk_disable(phy->refclk);
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static UNIVERSAL_DEV_PM_OPS(dm816x_usb_phy_pm_ops,
|
||
|
|
dm816x_usb_phy_runtime_suspend,
|
||
|
|
dm816x_usb_phy_runtime_resume,
|
||
|
|
NULL);
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
static const struct of_device_id dm816x_usb_phy_id_table[] = {
|
||
|
|
{
|
||
|
|
.compatible = "ti,dm8168-usb-phy",
|
||
|
|
},
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, dm816x_usb_phy_id_table);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int dm816x_usb_phy_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct dm816x_usb_phy *phy;
|
||
|
|
struct resource *res;
|
||
|
|
struct phy *generic_phy;
|
||
|
|
struct phy_provider *phy_provider;
|
||
|
|
struct usb_otg *otg;
|
||
|
|
const struct of_device_id *of_id;
|
||
|
|
const struct usb_phy_data *phy_data;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
of_id = of_match_device(of_match_ptr(dm816x_usb_phy_id_table),
|
||
|
|
&pdev->dev);
|
||
|
|
if (!of_id)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
|
||
|
|
if (!phy)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
|
if (!res)
|
||
|
|
return -ENOENT;
|
||
|
|
|
||
|
|
phy->syscon = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
|
||
|
|
"syscon");
|
||
|
|
if (IS_ERR(phy->syscon))
|
||
|
|
return PTR_ERR(phy->syscon);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* According to sprs614e.pdf, the first usb_ctrl is shared and
|
||
|
|
* the second instance for usb_ctrl is reserved.. Also the
|
||
|
|
* register bits are different from earlier TRMs.
|
||
|
|
*/
|
||
|
|
phy->usb_ctrl = 0x20;
|
||
|
|
phy->usbphy_ctrl = (res->start & 0xff) + 4;
|
||
|
|
if (phy->usbphy_ctrl == 0x2c)
|
||
|
|
phy->instance = 1;
|
||
|
|
|
||
|
|
phy_data = of_id->data;
|
||
|
|
|
||
|
|
otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
|
||
|
|
if (!otg)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
phy->dev = &pdev->dev;
|
||
|
|
phy->phy.dev = phy->dev;
|
||
|
|
phy->phy.label = "dm8168_usb_phy";
|
||
|
|
phy->phy.otg = otg;
|
||
|
|
phy->phy.type = USB_PHY_TYPE_USB2;
|
||
|
|
otg->set_host = dm816x_usb_phy_set_host;
|
||
|
|
otg->set_peripheral = dm816x_usb_phy_set_peripheral;
|
||
|
|
otg->usb_phy = &phy->phy;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, phy);
|
||
|
|
|
||
|
|
phy->refclk = devm_clk_get(phy->dev, "refclk");
|
||
|
|
if (IS_ERR(phy->refclk))
|
||
|
|
return PTR_ERR(phy->refclk);
|
||
|
|
error = clk_prepare(phy->refclk);
|
||
|
|
if (error)
|
||
|
|
return error;
|
||
|
|
|
||
|
|
pm_runtime_enable(phy->dev);
|
||
|
|
generic_phy = devm_phy_create(phy->dev, NULL, &ops);
|
||
|
|
if (IS_ERR(generic_phy))
|
||
|
|
return PTR_ERR(generic_phy);
|
||
|
|
|
||
|
|
phy_set_drvdata(generic_phy, phy);
|
||
|
|
|
||
|
|
phy_provider = devm_of_phy_provider_register(phy->dev,
|
||
|
|
of_phy_simple_xlate);
|
||
|
|
if (IS_ERR(phy_provider))
|
||
|
|
return PTR_ERR(phy_provider);
|
||
|
|
|
||
|
|
usb_add_phy_dev(&phy->phy);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dm816x_usb_phy_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct dm816x_usb_phy *phy = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
usb_remove_phy(&phy->phy);
|
||
|
|
pm_runtime_disable(phy->dev);
|
||
|
|
clk_unprepare(phy->refclk);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver dm816x_usb_phy_driver = {
|
||
|
|
.probe = dm816x_usb_phy_probe,
|
||
|
|
.remove = dm816x_usb_phy_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "dm816x-usb-phy",
|
||
|
|
.pm = &dm816x_usb_phy_pm_ops,
|
||
|
|
.of_match_table = of_match_ptr(dm816x_usb_phy_id_table),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(dm816x_usb_phy_driver);
|
||
|
|
|
||
|
|
MODULE_ALIAS("platform:dm816x_usb");
|
||
|
|
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
|
||
|
|
MODULE_DESCRIPTION("dm816x usb phy driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|