--- /dev/null
+/*
+ * Marvell MVEBU pinctrl driver
+ *
+ * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __PINCTRL_MVEBU_H__
+#define __PINCTRL_MVEBU_H__
+
+/**
+ * struct mvebu_mpp_ctrl - describe a mpp control
+ * @name: name of the control group
+ * @pid: first pin id handled by this control
+ * @npins: number of pins controlled by this control
+ * @mpp_get: (optional) special function to get mpp setting
+ * @mpp_set: (optional) special function to set mpp setting
+ * @mpp_gpio_req: (optional) special function to request gpio
+ * @mpp_gpio_dir: (optional) special function to set gpio direction
+ *
+ * A mpp_ctrl describes a muxable unit, e.g. pin, group of pins, or
+ * internal function, inside the SoC. Each muxable unit can be switched
+ * between two or more different settings, e.g. assign mpp pin 13 to
+ * uart1 or sata.
+ *
+ * The mpp_get/_set functions are mandatory and are used to get/set a
+ * specific mode. The optional mpp_gpio_req/_dir functions can be used
+ * to allow pin settings with varying gpio pins.
+ */
+struct mvebu_mpp_ctrl {
+ const char *name;
+ u8 pid;
+ u8 npins;
+ unsigned *pins;
+ int (*mpp_get)(unsigned pid, unsigned long *config);
+ int (*mpp_set)(unsigned pid, unsigned long config);
+ int (*mpp_gpio_req)(unsigned pid);
+ int (*mpp_gpio_dir)(unsigned pid, bool input);
+};
+
+/**
+ * struct mvebu_mpp_ctrl_setting - describe a mpp ctrl setting
+ * @val: ctrl setting value
+ * @name: ctrl setting name, e.g. uart2, spi0 - unique per mpp_mode
+ * @subname: (optional) additional ctrl setting name, e.g. rts, cts
+ * @variant: (optional) variant identifier mask
+ * @flags: (private) flags to store gpi/gpo/gpio capabilities
+ *
+ * A ctrl_setting describes a specific internal mux function that a mpp pin
+ * can be switched to. The value (val) will be written in the corresponding
+ * register for common mpp pin configuration registers on MVEBU. SoC specific
+ * mpp_get/_set function may use val to distinguish between different settings.
+ *
+ * The name will be used to switch to this setting in DT description, e.g.
+ * marvell,function = "uart2". subname is only for debugging purposes.
+ *
+ * If name is one of "gpi", "gpo", "gpio" gpio capabilities are
+ * parsed during initialization and stored in flags.
+ *
+ * The variant can be used to combine different revisions of one SoC to a
+ * common pinctrl driver. It is matched (AND) with variant of soc_info to
+ * determine if a setting is available on the current SoC revision.
+ */
+struct mvebu_mpp_ctrl_setting {
+ u8 val;
+ const char *name;
+ const char *subname;
+ u8 variant;
+ u8 flags;
+#define MVEBU_SETTING_GPO (1 << 0)
+#define MVEBU_SETTING_GPI (1 << 1)
+};
+
+/**
+ * struct mvebu_mpp_mode - link ctrl and settings
+ * @pid: first pin id handled by this mode
+ * @settings: list of settings available for this mode
+ *
+ * A mode connects all available settings with the corresponding mpp_ctrl
+ * given by pid.
+ */
+struct mvebu_mpp_mode {
+ u8 pid;
+ struct mvebu_mpp_ctrl_setting *settings;
+};
+
+/**
+ * struct mvebu_pinctrl_soc_info - SoC specific info passed to pinctrl-mvebu
+ * @variant: variant mask of soc_info
+ * @controls: list of available mvebu_mpp_ctrls
+ * @ncontrols: number of available mvebu_mpp_ctrls
+ * @modes: list of available mvebu_mpp_modes
+ * @nmodes: number of available mvebu_mpp_modes
+ * @gpioranges: list of pinctrl_gpio_ranges
+ * @ngpioranges: number of available pinctrl_gpio_ranges
+ *
+ * This struct describes all pinctrl related information for a specific SoC.
+ * If variant is unequal 0 it will be matched (AND) with variant of each
+ * setting and allows to distinguish between different revisions of one SoC.
+ */
+struct mvebu_pinctrl_soc_info {
+ u8 variant;
+ struct mvebu_mpp_ctrl *controls;
+ int ncontrols;
+ struct mvebu_mpp_mode *modes;
+ int nmodes;
+ struct pinctrl_gpio_range *gpioranges;
+ int ngpioranges;
+};
+
+#define MPP_FUNC_CTRL(_idl, _idh, _name, _func) \
+ { \
+ .name = _name, \
+ .pid = _idl, \
+ .npins = _idh - _idl + 1, \
+ .pins = (unsigned[_idh - _idl + 1]) { }, \
+ .mpp_get = _func ## _get, \
+ .mpp_set = _func ## _set, \
+ .mpp_gpio_req = NULL, \
+ .mpp_gpio_dir = NULL, \
+ }
+
+#define MPP_FUNC_GPIO_CTRL(_idl, _idh, _name, _func) \
+ { \
+ .name = _name, \
+ .pid = _idl, \
+ .npins = _idh - _idl + 1, \
+ .pins = (unsigned[_idh - _idl + 1]) { }, \
+ .mpp_get = _func ## _get, \
+ .mpp_set = _func ## _set, \
+ .mpp_gpio_req = _func ## _gpio_req, \
+ .mpp_gpio_dir = _func ## _gpio_dir, \
+ }
+
+#define _MPP_VAR_FUNCTION(_val, _name, _subname, _mask) \
+ { \
+ .val = _val, \
+ .name = _name, \
+ .subname = _subname, \
+ .variant = _mask, \
+ .flags = 0, \
+ }
+
+#if defined(CONFIG_DEBUG_FS)
+#define MPP_VAR_FUNCTION(_val, _name, _subname, _mask) \
+ _MPP_VAR_FUNCTION(_val, _name, _subname, _mask)
+#else
+#define MPP_VAR_FUNCTION(_val, _name, _subname, _mask) \
+ _MPP_VAR_FUNCTION(_val, _name, NULL, _mask)
+#endif
+
+#define MPP_FUNCTION(_val, _name, _subname) \
+ MPP_VAR_FUNCTION(_val, _name, _subname, (u8)-1)
+
+#define MPP_MODE(_id, ...) \
+ { \
+ .pid = _id, \
+ .settings = (struct mvebu_mpp_ctrl_setting[]){ \
+ __VA_ARGS__, { } }, \
+ }
+
+#define MPP_GPIO_RANGE(_id, _pinbase, _gpiobase, _npins) \
+ { \
+ .name = "mvebu-gpio", \
+ .id = _id, \
+ .pin_base = _pinbase, \
+ .base = _gpiobase, \
+ .npins = _npins, \
+ }
+
+#define MVEBU_MPPS_PER_REG 8
+#define MVEBU_MPP_BITS 4
+#define MVEBU_MPP_MASK 0xf
+
+static inline int default_mpp_ctrl_get(void __iomem *base, unsigned int pid,
+ unsigned long *config)
+{
+ unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+ unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+
+ *config = (readl(base + off) >> shift) & MVEBU_MPP_MASK;
+
+ return 0;
+}
+
+static inline int default_mpp_ctrl_set(void __iomem *base, unsigned int pid,
+ unsigned long config)
+{
+ unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+ unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
+ unsigned long reg;
+
+ reg = readl(base + off) & ~(MVEBU_MPP_MASK << shift);
+ writel(reg | (config << shift), base + off);
+
+ return 0;
+}
+
+int mvebu_pinctrl_probe(struct platform_device *pdev);
+int mvebu_pinctrl_remove(struct platform_device *pdev);
+
+#endif
Code Review / kvmfornfv.git / blobdiff