sti_usb_phy.c
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/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <bitfield.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <generic-phy.h>
#include <linux/libfdt.h>
#include <regmap.h>
#include <reset-uclass.h>
#include <syscon.h>
#include <wait_bit.h>
#include <linux/bitops.h>
#include <linux/compat.h>
DECLARE_GLOBAL_DATA_PTR;
/* Default PHY_SEL and REFCLKSEL configuration */
#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
/* ports parameters overriding */
#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
#define PHYPARAM_REG 1
#define PHYCTRL_REG 2
#define PHYPARAM_NB 3
struct sti_usb_phy {
struct regmap *regmap;
struct reset_ctl global_ctl;
struct reset_ctl port_ctl;
int param;
int ctrl;
};
static int sti_usb_phy_deassert(struct sti_usb_phy *phy)
{
int ret;
ret = reset_deassert(&phy->global_ctl);
if (ret < 0) {
pr_err("PHY global deassert failed: %d", ret);
return ret;
}
ret = reset_deassert(&phy->port_ctl);
if (ret < 0)
pr_err("PHY port deassert failed: %d", ret);
return ret;
}
static int sti_usb_phy_init(struct phy *usb_phy)
{
struct udevice *dev = usb_phy->dev;
struct sti_usb_phy *phy = dev_get_priv(dev);
void __iomem *reg;
/* set ctrl picophy value */
reg = (void __iomem *)phy->regmap->base + phy->ctrl;
/* CTRL_PORT mask is 0x1f */
clrsetbits_le32(reg, 0x1f, STIH407_USB_PICOPHY_CTRL_PORT_CONF);
/* set ports parameters overriding */
reg = (void __iomem *)phy->regmap->base + phy->param;
/* PARAM_DEF mask is 0xffffffff */
clrsetbits_le32(reg, 0xffffffff, STIH407_USB_PICOPHY_PARAM_DEF);
return sti_usb_phy_deassert(phy);
}
static int sti_usb_phy_exit(struct phy *usb_phy)
{
struct udevice *dev = usb_phy->dev;
struct sti_usb_phy *phy = dev_get_priv(dev);
int ret;
ret = reset_assert(&phy->port_ctl);
if (ret < 0) {
pr_err("PHY port assert failed: %d", ret);
return ret;
}
ret = reset_assert(&phy->global_ctl);
if (ret < 0)
pr_err("PHY global assert failed: %d", ret);
return ret;
}
struct phy_ops sti_usb_phy_ops = {
.init = sti_usb_phy_init,
.exit = sti_usb_phy_exit,
};
int sti_usb_phy_probe(struct udevice *dev)
{
struct sti_usb_phy *priv = dev_get_priv(dev);
struct udevice *syscon;
struct ofnode_phandle_args syscfg_phandle;
u32 cells[PHYPARAM_NB];
int ret, count;
/* get corresponding syscon phandle */
ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
&syscfg_phandle);
if (ret < 0) {
pr_err("Can't get syscfg phandle: %d\n", ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, syscfg_phandle.node,
&syscon);
if (ret) {
pr_err("unable to find syscon device (%d)\n", ret);
return ret;
}
priv->regmap = syscon_get_regmap(syscon);
if (!priv->regmap) {
pr_err("unable to find regmap\n");
return -ENODEV;
}
/* get phy param offset */
count = fdtdec_get_int_array_count(gd->fdt_blob, dev_of_offset(dev),
"st,syscfg", cells,
ARRAY_SIZE(cells));
if (count < 0) {
pr_err("Bad PHY st,syscfg property %d\n", count);
return -EINVAL;
}
if (count > PHYPARAM_NB) {
pr_err("Unsupported PHY param count %d\n", count);
return -EINVAL;
}
priv->param = cells[PHYPARAM_REG];
priv->ctrl = cells[PHYCTRL_REG];
/* get global reset control */
ret = reset_get_by_name(dev, "global", &priv->global_ctl);
if (ret) {
pr_err("can't get global reset for %s (%d)", dev->name, ret);
return ret;
}
/* get port reset control */
ret = reset_get_by_name(dev, "port", &priv->port_ctl);
if (ret) {
pr_err("can't get port reset for %s (%d)", dev->name, ret);
return ret;
}
return 0;
}
static const struct udevice_id sti_usb_phy_ids[] = {
{ .compatible = "st,stih407-usb2-phy" },
{ }
};
U_BOOT_DRIVER(sti_usb_phy) = {
.name = "sti_usb_phy",
.id = UCLASS_PHY,
.of_match = sti_usb_phy_ids,
.probe = sti_usb_phy_probe,
.ops = &sti_usb_phy_ops,
.priv_auto_alloc_size = sizeof(struct sti_usb_phy),
};