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path: root/drivers/pinctrl/zte/pinctrl-zx.c
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Diffstat (limited to 'drivers/pinctrl/zte/pinctrl-zx.c')
-rw-r--r--drivers/pinctrl/zte/pinctrl-zx.c445
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 000000000000..787e3967bd5c
--- /dev/null
+++ b/drivers/pinctrl/zte/pinctrl-zx.c
@@ -0,0 +1,445 @@
+/*
+ * Copyright (C) 2017 Sanechips Technology Co., Ltd.
+ * Copyright 2017 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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 = data->muxes;
+ u32 mask = (1 << data->width) - 1;
+ u32 offset = data->offset;
+ u32 bitpos = data->bitpos;
+ struct function_desc *func;
+ unsigned long flags;
+ u32 val, mval;
+
+ /* Skip reserved pin */
+ if (!data)
+ return -EINVAL;
+
+ 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 caluculated 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_kzalloc(&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 = devm_kzalloc(&pdev->dev, 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_kzalloc(&pdev->dev,
+ func->num_group_names *
+ sizeof(*func->group_names),
+ GFP_KERNEL);
+ if (!func->group_names)
+ 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;
+ struct resource *res;
+ int ret;
+
+ zpctl = devm_kzalloc(&pdev->dev, sizeof(*zpctl), GFP_KERNEL);
+ if (!zpctl)
+ return -ENOMEM;
+
+ spin_lock_init(&zpctl->lock);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ zpctl->base = devm_ioremap_resource(&pdev->dev, res);
+ 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);
+ 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;
+}
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