u-boot/arch/arm/mach-tegra/xusb-padctl-common.c

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/*
* Copyright (c) 2014-2015, NVIDIA CORPORATION. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0
*/
#define pr_fmt(fmt) "tegra-xusb-padctl: " fmt
#include <common.h>
#include <errno.h>
#include "xusb-padctl-common.h"
#include <asm/arch/clock.h>
int tegra_xusb_phy_prepare(struct tegra_xusb_phy *phy)
{
if (phy && phy->ops && phy->ops->prepare)
return phy->ops->prepare(phy);
return phy ? -ENOSYS : -EINVAL;
}
int tegra_xusb_phy_enable(struct tegra_xusb_phy *phy)
{
if (phy && phy->ops && phy->ops->enable)
return phy->ops->enable(phy);
return phy ? -ENOSYS : -EINVAL;
}
int tegra_xusb_phy_disable(struct tegra_xusb_phy *phy)
{
if (phy && phy->ops && phy->ops->disable)
return phy->ops->disable(phy);
return phy ? -ENOSYS : -EINVAL;
}
int tegra_xusb_phy_unprepare(struct tegra_xusb_phy *phy)
{
if (phy && phy->ops && phy->ops->unprepare)
return phy->ops->unprepare(phy);
return phy ? -ENOSYS : -EINVAL;
}
struct tegra_xusb_phy *tegra_xusb_phy_get(unsigned int type)
{
struct tegra_xusb_phy *phy;
int i;
for (i = 0; i < padctl.socdata->num_phys; i++) {
phy = &padctl.socdata->phys[i];
if (phy->type != type)
continue;
return phy;
}
return NULL;
}
static const struct tegra_xusb_padctl_lane *
tegra_xusb_padctl_find_lane(struct tegra_xusb_padctl *padctl, const char *name)
{
unsigned int i;
for (i = 0; i < padctl->socdata->num_lanes; i++)
if (strcmp(name, padctl->socdata->lanes[i].name) == 0)
return &padctl->socdata->lanes[i];
return NULL;
}
static int
tegra_xusb_padctl_group_parse_dt(struct tegra_xusb_padctl *padctl,
struct tegra_xusb_padctl_group *group,
ofnode node)
{
unsigned int i;
int len, ret;
group->name = ofnode_get_name(node);
len = ofnode_read_string_count(node, "nvidia,lanes");
if (len < 0) {
error("failed to parse \"nvidia,lanes\" property");
return -EINVAL;
}
group->num_pins = len;
for (i = 0; i < group->num_pins; i++) {
ret = ofnode_read_string_index(node, "nvidia,lanes", i,
&group->pins[i]);
if (ret) {
error("failed to read string from \"nvidia,lanes\" property");
return -EINVAL;
}
}
group->num_pins = len;
ret = ofnode_read_string_index(node, "nvidia,function", 0,
&group->func);
if (ret) {
error("failed to parse \"nvidia,func\" property");
return -EINVAL;
}
group->iddq = ofnode_read_u32_default(node, "nvidia,iddq", -1);
return 0;
}
static int tegra_xusb_padctl_find_function(struct tegra_xusb_padctl *padctl,
const char *name)
{
unsigned int i;
for (i = 0; i < padctl->socdata->num_functions; i++)
if (strcmp(name, padctl->socdata->functions[i]) == 0)
return i;
return -ENOENT;
}
static int
tegra_xusb_padctl_lane_find_function(struct tegra_xusb_padctl *padctl,
const struct tegra_xusb_padctl_lane *lane,
const char *name)
{
unsigned int i;
int func;
func = tegra_xusb_padctl_find_function(padctl, name);
if (func < 0)
return func;
for (i = 0; i < lane->num_funcs; i++)
if (lane->funcs[i] == func)
return i;
return -ENOENT;
}
static int
tegra_xusb_padctl_group_apply(struct tegra_xusb_padctl *padctl,
const struct tegra_xusb_padctl_group *group)
{
unsigned int i;
for (i = 0; i < group->num_pins; i++) {
const struct tegra_xusb_padctl_lane *lane;
unsigned int func;
u32 value;
lane = tegra_xusb_padctl_find_lane(padctl, group->pins[i]);
if (!lane) {
error("no lane for pin %s", group->pins[i]);
continue;
}
func = tegra_xusb_padctl_lane_find_function(padctl, lane,
group->func);
if (func < 0) {
error("function %s invalid for lane %s: %d",
group->func, lane->name, func);
continue;
}
value = padctl_readl(padctl, lane->offset);
/* set pin function */
value &= ~(lane->mask << lane->shift);
value |= func << lane->shift;
/*
* Set IDDQ if supported on the lane and specified in the
* configuration.
*/
if (lane->iddq > 0 && group->iddq >= 0) {
if (group->iddq != 0)
value &= ~(1 << lane->iddq);
else
value |= 1 << lane->iddq;
}
padctl_writel(padctl, value, lane->offset);
}
return 0;
}
static int
tegra_xusb_padctl_config_apply(struct tegra_xusb_padctl *padctl,
struct tegra_xusb_padctl_config *config)
{
unsigned int i;
for (i = 0; i < config->num_groups; i++) {
const struct tegra_xusb_padctl_group *group;
int err;
group = &config->groups[i];
err = tegra_xusb_padctl_group_apply(padctl, group);
if (err < 0) {
error("failed to apply group %s: %d",
group->name, err);
continue;
}
}
return 0;
}
static int
tegra_xusb_padctl_config_parse_dt(struct tegra_xusb_padctl *padctl,
struct tegra_xusb_padctl_config *config,
ofnode node)
{
ofnode subnode;
config->name = ofnode_get_name(node);
for (subnode = ofnode_first_subnode(node);
ofnode_valid(subnode);
subnode = ofnode_next_subnode(subnode)) {
struct tegra_xusb_padctl_group *group;
int err;
group = &config->groups[config->num_groups];
err = tegra_xusb_padctl_group_parse_dt(padctl, group, subnode);
if (err < 0) {
error("failed to parse group %s", group->name);
return err;
}
config->num_groups++;
}
return 0;
}
static int tegra_xusb_padctl_parse_dt(struct tegra_xusb_padctl *padctl,
ofnode node)
{
ofnode subnode;
int err;
err = ofnode_read_resource(node, 0, &padctl->regs);
if (err < 0) {
error("registers not found");
return err;
}
for (subnode = ofnode_first_subnode(node);
ofnode_valid(subnode);
subnode = ofnode_next_subnode(subnode)) {
struct tegra_xusb_padctl_config *config = &padctl->config;
debug("%s: subnode=%s\n", __func__, ofnode_get_name(subnode));
err = tegra_xusb_padctl_config_parse_dt(padctl, config,
subnode);
if (err < 0) {
error("failed to parse entry %s: %d",
config->name, err);
continue;
}
}
debug("%s: done\n", __func__);
return 0;
}
struct tegra_xusb_padctl padctl;
int tegra_xusb_process_nodes(ofnode nodes[], unsigned int count,
const struct tegra_xusb_padctl_soc *socdata)
{
unsigned int i;
int err;
debug("%s: count=%d\n", __func__, count);
for (i = 0; i < count; i++) {
debug("%s: i=%d, node=%p\n", __func__, i, nodes[i].np);
if (!ofnode_is_available(nodes[i]))
continue;
padctl.socdata = socdata;
err = tegra_xusb_padctl_parse_dt(&padctl, nodes[i]);
if (err < 0) {
error("failed to parse DT: %d", err);
continue;
}
/* deassert XUSB padctl reset */
reset_set_enable(PERIPH_ID_XUSB_PADCTL, 0);
err = tegra_xusb_padctl_config_apply(&padctl, &padctl.config);
if (err < 0) {
error("failed to apply pinmux: %d", err);
continue;
}
/* only a single instance is supported */
break;
}
debug("%s: done\n", __func__);
return 0;
}