1 files changed, 305 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/xusb-padctl-common.c b/arch/arm/mach-tegra/xusb-padctl-common.c
new file mode 100644
index 0000000000..18ad7bfbdc
--- /dev/null
+++ b/arch/arm/mach-tegra/xusb-padctl-common.c
@@ -0,0 +1,305 @@
+/*
+ * 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,
+				 const void *fdt, int node)
+{
+	unsigned int i;
+	int len, err;
+
+	group->name = fdt_get_name(fdt, node, &len);
+
+	len = fdt_count_strings(fdt, 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++) {
+		err = fdt_get_string_index(fdt, node, "nvidia,lanes", i,
+					   &group->pins[i]);
+		if (err < 0) {
+			error("failed to read string from \"nvidia,lanes\" property");
+			return -EINVAL;
+		}
+	}
+
+	group->num_pins = len;
+
+	err = fdt_get_string(fdt, node, "nvidia,function", &group->func);
+	if (err < 0) {
+		error("failed to parse \"nvidia,func\" property");
+		return -EINVAL;
+	}
+
+	group->iddq = fdtdec_get_int(fdt, 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,
+				  const void *fdt, int node)
+{
+	int subnode;
+
+	config->name = fdt_get_name(fdt, node, NULL);
+
+	fdt_for_each_subnode(fdt, subnode, node) {
+		struct tegra_xusb_padctl_group *group;
+		int err;
+
+		group = &config->groups[config->num_groups];
+
+		err = tegra_xusb_padctl_group_parse_dt(padctl, group, fdt,
+						       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,
+				      const void *fdt, int node)
+{
+	int subnode, err;
+
+	err = fdt_get_resource(fdt, node, "reg", 0, &padctl->regs);
+	if (err < 0) {
+		error("registers not found");
+		return err;
+	}
+
+	fdt_for_each_subnode(fdt, subnode, node) {
+		struct tegra_xusb_padctl_config *config = &padctl->config;
+
+		err = tegra_xusb_padctl_config_parse_dt(padctl, config, fdt,
+							subnode);
+		if (err < 0) {
+			error("failed to parse entry %s: %d",
+			      config->name, err);
+			continue;
+		}
+	}
+
+	return 0;
+}
+
+struct tegra_xusb_padctl padctl;
+
+int tegra_xusb_process_nodes(const void *fdt, int nodes[], unsigned int count,
+	const struct tegra_xusb_padctl_soc *socdata)
+{
+	unsigned int i;
+	int err;
+
+	for (i = 0; i < count; i++) {
+		if (!fdtdec_get_is_enabled(fdt, nodes[i]))
+			continue;
+
+		padctl.socdata = socdata;
+
+		err = tegra_xusb_padctl_parse_dt(&padctl, fdt, 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;
+	}
+
+	return 0;
+}