1 files changed, 445 insertions, 0 deletions

diff --git a/drivers/pinctrl/zte/pinctrl-zx.c b/drivers/pinctrl/zte/pinctrl-zx.c
new file mode 100644
index 000000000..80d00ab8c
--- /dev/null
+++ b/drivers/pinctrl/zte/pinctrl-zx.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 Sanechips Technology Co., Ltd.
+ * Copyright 2017 Linaro Ltd.
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+#include "../pinmux.h"
+#include "pinctrl-zx.h"
+
+#define ZX_PULL_DOWN		BIT(0)
+#define ZX_PULL_UP		BIT(1)
+#define ZX_INPUT_ENABLE		BIT(3)
+#define ZX_DS_SHIFT		4
+#define ZX_DS_MASK		(0x7 << ZX_DS_SHIFT)
+#define ZX_DS_VALUE(x)		(((x) << ZX_DS_SHIFT) & ZX_DS_MASK)
+#define ZX_SLEW			BIT(8)
+
+struct zx_pinctrl {
+	struct pinctrl_dev *pctldev;
+	struct device *dev;
+	void __iomem *base;
+	void __iomem *aux_base;
+	spinlock_t lock;
+	struct zx_pinctrl_soc_info *info;
+};
+
+static int zx_dt_node_to_map(struct pinctrl_dev *pctldev,
+			     struct device_node *np_config,
+			     struct pinctrl_map **map, u32 *num_maps)
+{
+	return pinconf_generic_dt_node_to_map(pctldev, np_config, map,
+					      num_maps, PIN_MAP_TYPE_INVALID);
+}
+
+static const struct pinctrl_ops zx_pinctrl_ops = {
+	.dt_node_to_map = zx_dt_node_to_map,
+	.dt_free_map = pinctrl_utils_free_map,
+	.get_groups_count = pinctrl_generic_get_group_count,
+	.get_group_name = pinctrl_generic_get_group_name,
+	.get_group_pins = pinctrl_generic_get_group_pins,
+};
+
+#define NONAON_MVAL 2
+
+static int zx_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
+		      unsigned int group_selector)
+{
+	struct zx_pinctrl *zpctl = pinctrl_dev_get_drvdata(pctldev);
+	struct zx_pinctrl_soc_info *info = zpctl->info;
+	const struct pinctrl_pin_desc *pindesc = info->pins + group_selector;
+	struct zx_pin_data *data = pindesc->drv_data;
+	struct zx_mux_desc *mux;
+	u32 mask, offset, bitpos;
+	struct function_desc *func;
+	unsigned long flags;
+	u32 val, mval;
+
+	/* Skip reserved pin */
+	if (!data)
+		return -EINVAL;
+
+	mux = data->muxes;
+	mask = (1 << data->width) - 1;
+	offset = data->offset;
+	bitpos = data->bitpos;
+
+	func = pinmux_generic_get_function(pctldev, func_selector);
+	if (!func)
+		return -EINVAL;
+
+	while (mux->name) {
+		if (strcmp(mux->name, func->name) == 0)
+			break;
+		mux++;
+	}
+
+	/* Found mux value to be written */
+	mval = mux->muxval;
+
+	spin_lock_irqsave(&zpctl->lock, flags);
+
+	if (data->aon_pin) {
+		/*
+		 * It's an AON pin, whose mux register offset and bit position
+		 * can be calculated from pin number.  Each register covers 16
+		 * pins, and each pin occupies 2 bits.
+		 */
+		u16 aoffset = pindesc->number / 16 * 4;
+		u16 abitpos = (pindesc->number % 16) * 2;
+
+		if (mval & AON_MUX_FLAG) {
+			/*
+			 * This is a mux value that needs to be written into
+			 * AON pinmux register.  Write it and then we're done.
+			 */
+			val = readl(zpctl->aux_base + aoffset);
+			val &= ~(0x3 << abitpos);
+			val |= (mval & 0x3) << abitpos;
+			writel(val, zpctl->aux_base + aoffset);
+		} else {
+			/*
+			 * It's a mux value that needs to be written into TOP
+			 * pinmux register.
+			 */
+			val = readl(zpctl->base + offset);
+			val &= ~(mask << bitpos);
+			val |= (mval & mask) << bitpos;
+			writel(val, zpctl->base + offset);
+
+			/*
+			 * In this case, the AON pinmux register needs to be
+			 * set up to select non-AON function.
+			 */
+			val = readl(zpctl->aux_base + aoffset);
+			val &= ~(0x3 << abitpos);
+			val |= NONAON_MVAL << abitpos;
+			writel(val, zpctl->aux_base + aoffset);
+		}
+
+	} else {
+		/*
+		 * This is a TOP pin, and we only need to set up TOP pinmux
+		 * register and then we're done with it.
+		 */
+		val = readl(zpctl->base + offset);
+		val &= ~(mask << bitpos);
+		val |= (mval & mask) << bitpos;
+		writel(val, zpctl->base + offset);
+	}
+
+	spin_unlock_irqrestore(&zpctl->lock, flags);
+
+	return 0;
+}
+
+static const struct pinmux_ops zx_pinmux_ops = {
+	.get_functions_count = pinmux_generic_get_function_count,
+	.get_function_name = pinmux_generic_get_function_name,
+	.get_function_groups = pinmux_generic_get_function_groups,
+	.set_mux = zx_set_mux,
+};
+
+static int zx_pin_config_get(struct pinctrl_dev *pctldev, unsigned int pin,
+			     unsigned long *config)
+{
+	struct zx_pinctrl *zpctl = pinctrl_dev_get_drvdata(pctldev);
+	struct zx_pinctrl_soc_info *info = zpctl->info;
+	const struct pinctrl_pin_desc *pindesc = info->pins + pin;
+	struct zx_pin_data *data = pindesc->drv_data;
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	u32 val;
+
+	/* Skip reserved pin */
+	if (!data)
+		return -EINVAL;
+
+	val = readl(zpctl->aux_base + data->coffset);
+	val = val >> data->cbitpos;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		val &= ZX_PULL_DOWN;
+		val = !!val;
+		if (val == 0)
+			return -EINVAL;
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		val &= ZX_PULL_UP;
+		val = !!val;
+		if (val == 0)
+			return -EINVAL;
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		val &= ZX_INPUT_ENABLE;
+		val = !!val;
+		if (val == 0)
+			return -EINVAL;
+		break;
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		val &= ZX_DS_MASK;
+		val = val >> ZX_DS_SHIFT;
+		break;
+	case PIN_CONFIG_SLEW_RATE:
+		val &= ZX_SLEW;
+		val = !!val;
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	*config = pinconf_to_config_packed(param, val);
+
+	return 0;
+}
+
+static int zx_pin_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			     unsigned long *configs, unsigned int num_configs)
+{
+	struct zx_pinctrl *zpctl = pinctrl_dev_get_drvdata(pctldev);
+	struct zx_pinctrl_soc_info *info = zpctl->info;
+	const struct pinctrl_pin_desc *pindesc = info->pins + pin;
+	struct zx_pin_data *data = pindesc->drv_data;
+	enum pin_config_param param;
+	u32 val, arg;
+	int i;
+
+	/* Skip reserved pin */
+	if (!data)
+		return -EINVAL;
+
+	val = readl(zpctl->aux_base + data->coffset);
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			val |= ZX_PULL_DOWN << data->cbitpos;
+			break;
+		case PIN_CONFIG_BIAS_PULL_UP:
+			val |= ZX_PULL_UP << data->cbitpos;
+			break;
+		case PIN_CONFIG_INPUT_ENABLE:
+			val |= ZX_INPUT_ENABLE << data->cbitpos;
+			break;
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			val &= ~(ZX_DS_MASK << data->cbitpos);
+			val |= ZX_DS_VALUE(arg) << data->cbitpos;
+			break;
+		case PIN_CONFIG_SLEW_RATE:
+			if (arg)
+				val |= ZX_SLEW << data->cbitpos;
+			else
+				val &= ~ZX_SLEW << data->cbitpos;
+			break;
+		default:
+			return -ENOTSUPP;
+		}
+	}
+
+	writel(val, zpctl->aux_base + data->coffset);
+	return 0;
+}
+
+static const struct pinconf_ops zx_pinconf_ops = {
+	.pin_config_set = zx_pin_config_set,
+	.pin_config_get = zx_pin_config_get,
+	.is_generic = true,
+};
+
+static int zx_pinctrl_build_state(struct platform_device *pdev)
+{
+	struct zx_pinctrl *zpctl = platform_get_drvdata(pdev);
+	struct zx_pinctrl_soc_info *info = zpctl->info;
+	struct pinctrl_dev *pctldev = zpctl->pctldev;
+	struct function_desc *functions;
+	int nfunctions;
+	struct group_desc *groups;
+	int ngroups;
+	int i;
+
+	/* Every single pin composes a group */
+	ngroups = info->npins;
+	groups = devm_kcalloc(&pdev->dev, ngroups, sizeof(*groups),
+			      GFP_KERNEL);
+	if (!groups)
+		return -ENOMEM;
+
+	for (i = 0; i < ngroups; i++) {
+		const struct pinctrl_pin_desc *pindesc = info->pins + i;
+		struct group_desc *group = groups + i;
+
+		group->name = pindesc->name;
+		group->pins = (int *) &pindesc->number;
+		group->num_pins = 1;
+		radix_tree_insert(&pctldev->pin_group_tree, i, group);
+	}
+
+	pctldev->num_groups = ngroups;
+
+	/* Build function list from pin mux functions */
+	functions = kcalloc(info->npins, sizeof(*functions), GFP_KERNEL);
+	if (!functions)
+		return -ENOMEM;
+
+	nfunctions = 0;
+	for (i = 0; i < info->npins; i++) {
+		const struct pinctrl_pin_desc *pindesc = info->pins + i;
+		struct zx_pin_data *data = pindesc->drv_data;
+		struct zx_mux_desc *mux;
+
+		/* Reserved pins do not have a drv_data at all */
+		if (!data)
+			continue;
+
+		/* Loop over all muxes for the pin */
+		mux = data->muxes;
+		while (mux->name) {
+			struct function_desc *func = functions;
+
+			/* Search function list for given mux */
+			while (func->name) {
+				if (strcmp(mux->name, func->name) == 0) {
+					/* Function exists */
+					func->num_group_names++;
+					break;
+				}
+				func++;
+			}
+
+			if (!func->name) {
+				/* New function */
+				func->name = mux->name;
+				func->num_group_names = 1;
+				radix_tree_insert(&pctldev->pin_function_tree,
+						  nfunctions++, func);
+			}
+
+			mux++;
+		}
+	}
+
+	pctldev->num_functions = nfunctions;
+	functions = krealloc(functions, nfunctions * sizeof(*functions),
+			     GFP_KERNEL);
+
+	/* Find pin groups for every single function */
+	for (i = 0; i < info->npins; i++) {
+		const struct pinctrl_pin_desc *pindesc = info->pins + i;
+		struct zx_pin_data *data = pindesc->drv_data;
+		struct zx_mux_desc *mux;
+
+		if (!data)
+			continue;
+
+		mux = data->muxes;
+		while (mux->name) {
+			struct function_desc *func;
+			const char **group;
+			int j;
+
+			/* Find function for given mux */
+			for (j = 0; j < nfunctions; j++)
+				if (strcmp(functions[j].name, mux->name) == 0)
+					break;
+
+			func = functions + j;
+			if (!func->group_names) {
+				func->group_names = devm_kcalloc(&pdev->dev,
+						func->num_group_names,
+						sizeof(*func->group_names),
+						GFP_KERNEL);
+				if (!func->group_names) {
+					kfree(functions);
+					return -ENOMEM;
+				}
+			}
+
+			group = func->group_names;
+			while (*group)
+				group++;
+			*group = pindesc->name;
+
+			mux++;
+		}
+	}
+
+	return 0;
+}
+
+int zx_pinctrl_init(struct platform_device *pdev,
+		    struct zx_pinctrl_soc_info *info)
+{
+	struct pinctrl_desc *pctldesc;
+	struct zx_pinctrl *zpctl;
+	struct device_node *np;
+	int ret;
+
+	zpctl = devm_kzalloc(&pdev->dev, sizeof(*zpctl), GFP_KERNEL);
+	if (!zpctl)
+		return -ENOMEM;
+
+	spin_lock_init(&zpctl->lock);
+
+	zpctl->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(zpctl->base))
+		return PTR_ERR(zpctl->base);
+
+	np = of_parse_phandle(pdev->dev.of_node, "zte,auxiliary-controller", 0);
+	if (!np) {
+		dev_err(&pdev->dev, "failed to find auxiliary controller\n");
+		return -ENODEV;
+	}
+
+	zpctl->aux_base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!zpctl->aux_base)
+		return -ENOMEM;
+
+	zpctl->dev = &pdev->dev;
+	zpctl->info = info;
+
+	pctldesc = devm_kzalloc(&pdev->dev, sizeof(*pctldesc), GFP_KERNEL);
+	if (!pctldesc)
+		return -ENOMEM;
+
+	pctldesc->name = dev_name(&pdev->dev);
+	pctldesc->owner = THIS_MODULE;
+	pctldesc->pins = info->pins;
+	pctldesc->npins = info->npins;
+	pctldesc->pctlops = &zx_pinctrl_ops;
+	pctldesc->pmxops = &zx_pinmux_ops;
+	pctldesc->confops = &zx_pinconf_ops;
+
+	zpctl->pctldev = devm_pinctrl_register(&pdev->dev, pctldesc, zpctl);
+	if (IS_ERR(zpctl->pctldev)) {
+		ret = PTR_ERR(zpctl->pctldev);
+		dev_err(&pdev->dev, "failed to register pinctrl: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, zpctl);
+
+	ret = zx_pinctrl_build_state(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to build state: %d\n", ret);
+		return ret;
+	}
+
+	dev_info(&pdev->dev, "initialized pinctrl driver\n");
+	return 0;
+}