1503 lines
36 KiB
C
1503 lines
36 KiB
C
/*
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* Generic device tree based pinctrl driver for one register per pin
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* type pinmux controllers
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include "core.h"
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#include "pinconf.h"
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#define DRIVER_NAME "pinctrl-single"
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#define PCS_MUX_PINS_NAME "pinctrl-single,pins"
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#define PCS_MUX_BITS_NAME "pinctrl-single,bits"
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#define PCS_REG_NAME_LEN ((sizeof(unsigned long) * 2) + 1)
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#define PCS_OFF_DISABLED ~0U
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/**
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* struct pcs_pingroup - pingroups for a function
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* @np: pingroup device node pointer
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* @name: pingroup name
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* @gpins: array of the pins in the group
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* @ngpins: number of pins in the group
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* @node: list node
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*/
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struct pcs_pingroup {
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struct device_node *np;
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const char *name;
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int *gpins;
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int ngpins;
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struct list_head node;
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};
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/**
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* struct pcs_func_vals - mux function register offset and value pair
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* @reg: register virtual address
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* @val: register value
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*/
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struct pcs_func_vals {
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void __iomem *reg;
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unsigned val;
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unsigned mask;
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};
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/**
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* struct pcs_conf_vals - pinconf parameter, pinconf register offset
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* and value, enable, disable, mask
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* @param: config parameter
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* @val: user input bits in the pinconf register
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* @enable: enable bits in the pinconf register
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* @disable: disable bits in the pinconf register
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* @mask: mask bits in the register value
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*/
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struct pcs_conf_vals {
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enum pin_config_param param;
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unsigned val;
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unsigned enable;
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unsigned disable;
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unsigned mask;
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};
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/**
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* struct pcs_conf_type - pinconf property name, pinconf param pair
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* @name: property name in DTS file
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* @param: config parameter
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*/
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struct pcs_conf_type {
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const char *name;
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enum pin_config_param param;
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};
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/**
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* struct pcs_function - pinctrl function
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* @name: pinctrl function name
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* @vals: register and vals array
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* @nvals: number of entries in vals array
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* @pgnames: array of pingroup names the function uses
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* @npgnames: number of pingroup names the function uses
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* @node: list node
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*/
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struct pcs_function {
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const char *name;
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struct pcs_func_vals *vals;
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unsigned nvals;
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const char **pgnames;
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int npgnames;
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struct pcs_conf_vals *conf;
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int nconfs;
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struct list_head node;
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};
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/**
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* struct pcs_gpiofunc_range - pin ranges with same mux value of gpio function
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* @offset: offset base of pins
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* @npins: number pins with the same mux value of gpio function
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* @gpiofunc: mux value of gpio function
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* @node: list node
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*/
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struct pcs_gpiofunc_range {
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unsigned offset;
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unsigned npins;
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unsigned gpiofunc;
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struct list_head node;
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};
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/**
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* struct pcs_data - wrapper for data needed by pinctrl framework
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* @pa: pindesc array
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* @cur: index to current element
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*
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* REVISIT: We should be able to drop this eventually by adding
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* support for registering pins individually in the pinctrl
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* framework for those drivers that don't need a static array.
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*/
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struct pcs_data {
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struct pinctrl_pin_desc *pa;
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int cur;
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};
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/**
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* struct pcs_name - register name for a pin
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* @name: name of the pinctrl register
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*
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* REVISIT: We may want to make names optional in the pinctrl
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* framework as some drivers may not care about pin names to
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* avoid kernel bloat. The pin names can be deciphered by user
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* space tools using debugfs based on the register address and
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* SoC packaging information.
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*/
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struct pcs_name {
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char name[PCS_REG_NAME_LEN];
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};
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/**
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* struct pcs_device - pinctrl device instance
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* @res: resources
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* @base: virtual address of the controller
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* @size: size of the ioremapped area
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* @dev: device entry
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* @pctl: pin controller device
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* @mutex: mutex protecting the lists
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* @width: bits per mux register
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* @fmask: function register mask
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* @fshift: function register shift
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* @foff: value to turn mux off
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* @fmax: max number of functions in fmask
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* @is_pinconf: whether supports pinconf
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* @names: array of register names for pins
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* @pins: physical pins on the SoC
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* @pgtree: pingroup index radix tree
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* @ftree: function index radix tree
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* @pingroups: list of pingroups
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* @functions: list of functions
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* @gpiofuncs: list of gpio functions
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* @ngroups: number of pingroups
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* @nfuncs: number of functions
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* @desc: pin controller descriptor
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* @read: register read function to use
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* @write: register write function to use
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*/
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struct pcs_device {
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struct resource *res;
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void __iomem *base;
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unsigned size;
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struct device *dev;
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struct pinctrl_dev *pctl;
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struct mutex mutex;
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unsigned width;
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unsigned fmask;
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unsigned fshift;
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unsigned foff;
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unsigned fmax;
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bool bits_per_mux;
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bool is_pinconf;
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struct pcs_name *names;
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struct pcs_data pins;
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struct radix_tree_root pgtree;
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struct radix_tree_root ftree;
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struct list_head pingroups;
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struct list_head functions;
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struct list_head gpiofuncs;
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unsigned ngroups;
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unsigned nfuncs;
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struct pinctrl_desc desc;
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unsigned (*read)(void __iomem *reg);
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void (*write)(unsigned val, void __iomem *reg);
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};
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static int pcs_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long *config);
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static int pcs_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long config);
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static enum pin_config_param pcs_bias[] = {
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PIN_CONFIG_BIAS_PULL_DOWN,
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PIN_CONFIG_BIAS_PULL_UP,
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};
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/*
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* REVISIT: Reads and writes could eventually use regmap or something
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* generic. But at least on omaps, some mux registers are performance
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* critical as they may need to be remuxed every time before and after
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* idle. Adding tests for register access width for every read and
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* write like regmap is doing is not desired, and caching the registers
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* does not help in this case.
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*/
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static unsigned __maybe_unused pcs_readb(void __iomem *reg)
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{
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return readb(reg);
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}
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static unsigned __maybe_unused pcs_readw(void __iomem *reg)
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{
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return readw(reg);
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}
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static unsigned __maybe_unused pcs_readl(void __iomem *reg)
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{
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return readl(reg);
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}
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static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
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{
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writeb(val, reg);
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}
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static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
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{
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writew(val, reg);
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}
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static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
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{
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writel(val, reg);
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}
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static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct pcs_device *pcs;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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return pcs->ngroups;
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}
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static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
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unsigned gselector)
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{
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struct pcs_device *pcs;
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struct pcs_pingroup *group;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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group = radix_tree_lookup(&pcs->pgtree, gselector);
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if (!group) {
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dev_err(pcs->dev, "%s could not find pingroup%i\n",
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__func__, gselector);
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return NULL;
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}
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return group->name;
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}
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static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned gselector,
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const unsigned **pins,
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unsigned *npins)
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{
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struct pcs_device *pcs;
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struct pcs_pingroup *group;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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group = radix_tree_lookup(&pcs->pgtree, gselector);
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if (!group) {
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dev_err(pcs->dev, "%s could not find pingroup%i\n",
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__func__, gselector);
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return -EINVAL;
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}
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*pins = group->gpins;
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*npins = group->ngpins;
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return 0;
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}
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static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
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struct seq_file *s,
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unsigned pin)
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{
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struct pcs_device *pcs;
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unsigned val, mux_bytes;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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mux_bytes = pcs->width / BITS_PER_BYTE;
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val = pcs->read(pcs->base + pin * mux_bytes);
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seq_printf(s, "%08x %s " , val, DRIVER_NAME);
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}
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static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
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struct pinctrl_map *map, unsigned num_maps)
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{
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struct pcs_device *pcs;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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devm_kfree(pcs->dev, map);
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}
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static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np_config,
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struct pinctrl_map **map, unsigned *num_maps);
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static const struct pinctrl_ops pcs_pinctrl_ops = {
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.get_groups_count = pcs_get_groups_count,
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.get_group_name = pcs_get_group_name,
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.get_group_pins = pcs_get_group_pins,
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.pin_dbg_show = pcs_pin_dbg_show,
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.dt_node_to_map = pcs_dt_node_to_map,
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.dt_free_map = pcs_dt_free_map,
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};
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static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
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{
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struct pcs_device *pcs;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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return pcs->nfuncs;
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}
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static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
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unsigned fselector)
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{
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struct pcs_device *pcs;
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struct pcs_function *func;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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func = radix_tree_lookup(&pcs->ftree, fselector);
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if (!func) {
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dev_err(pcs->dev, "%s could not find function%i\n",
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__func__, fselector);
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return NULL;
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}
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return func->name;
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}
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static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
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unsigned fselector,
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const char * const **groups,
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unsigned * const ngroups)
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{
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struct pcs_device *pcs;
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struct pcs_function *func;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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func = radix_tree_lookup(&pcs->ftree, fselector);
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if (!func) {
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dev_err(pcs->dev, "%s could not find function%i\n",
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__func__, fselector);
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return -EINVAL;
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}
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*groups = func->pgnames;
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*ngroups = func->npgnames;
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return 0;
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}
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static int pcs_get_function(struct pinctrl_dev *pctldev, unsigned pin,
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struct pcs_function **func)
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{
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struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
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struct pin_desc *pdesc = pin_desc_get(pctldev, pin);
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const struct pinctrl_setting_mux *setting;
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unsigned fselector;
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/* If pin is not described in DTS & enabled, mux_setting is NULL. */
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setting = pdesc->mux_setting;
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if (!setting)
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return -ENOTSUPP;
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fselector = setting->func;
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*func = radix_tree_lookup(&pcs->ftree, fselector);
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if (!(*func)) {
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dev_err(pcs->dev, "%s could not find function%i\n",
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__func__, fselector);
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return -ENOTSUPP;
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}
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return 0;
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}
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static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
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unsigned group)
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{
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struct pcs_device *pcs;
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struct pcs_function *func;
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int i;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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/* If function mask is null, needn't enable it. */
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if (!pcs->fmask)
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return 0;
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func = radix_tree_lookup(&pcs->ftree, fselector);
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if (!func)
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return -EINVAL;
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dev_dbg(pcs->dev, "enabling %s function%i\n",
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func->name, fselector);
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for (i = 0; i < func->nvals; i++) {
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struct pcs_func_vals *vals;
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unsigned val, mask;
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vals = &func->vals[i];
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val = pcs->read(vals->reg);
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if (!vals->mask)
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mask = pcs->fmask;
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else
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mask = pcs->fmask & vals->mask;
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val &= ~mask;
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val |= (vals->val & mask);
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pcs->write(val, vals->reg);
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}
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return 0;
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}
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static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
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unsigned group)
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{
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struct pcs_device *pcs;
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struct pcs_function *func;
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int i;
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pcs = pinctrl_dev_get_drvdata(pctldev);
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/* If function mask is null, needn't disable it. */
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if (!pcs->fmask)
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return;
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func = radix_tree_lookup(&pcs->ftree, fselector);
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if (!func) {
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dev_err(pcs->dev, "%s could not find function%i\n",
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__func__, fselector);
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return;
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}
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/*
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* Ignore disable if function-off is not specified. Some hardware
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* does not have clearly defined disable function. For pin specific
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* off modes, you can use alternate named states as described in
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* pinctrl-bindings.txt.
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*/
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if (pcs->foff == PCS_OFF_DISABLED) {
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dev_dbg(pcs->dev, "ignoring disable for %s function%i\n",
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func->name, fselector);
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return;
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}
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dev_dbg(pcs->dev, "disabling function%i %s\n",
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fselector, func->name);
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for (i = 0; i < func->nvals; i++) {
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struct pcs_func_vals *vals;
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unsigned val;
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vals = &func->vals[i];
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val = pcs->read(vals->reg);
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val &= ~pcs->fmask;
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val |= pcs->foff << pcs->fshift;
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pcs->write(val, vals->reg);
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}
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}
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static int pcs_request_gpio(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range, unsigned pin)
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{
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struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
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struct pcs_gpiofunc_range *frange = NULL;
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struct list_head *pos, *tmp;
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int mux_bytes = 0;
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unsigned data;
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/* If function mask is null, return directly. */
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if (!pcs->fmask)
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return -ENOTSUPP;
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list_for_each_safe(pos, tmp, &pcs->gpiofuncs) {
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frange = list_entry(pos, struct pcs_gpiofunc_range, node);
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if (pin >= frange->offset + frange->npins
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|| pin < frange->offset)
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continue;
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mux_bytes = pcs->width / BITS_PER_BYTE;
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data = pcs->read(pcs->base + pin * mux_bytes) & ~pcs->fmask;
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data |= frange->gpiofunc;
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pcs->write(data, pcs->base + pin * mux_bytes);
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break;
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}
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return 0;
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}
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|
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static const struct pinmux_ops pcs_pinmux_ops = {
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.get_functions_count = pcs_get_functions_count,
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.get_function_name = pcs_get_function_name,
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.get_function_groups = pcs_get_function_groups,
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.enable = pcs_enable,
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.disable = pcs_disable,
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.gpio_request_enable = pcs_request_gpio,
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};
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/* Clear BIAS value */
|
|
static void pcs_pinconf_clear_bias(struct pinctrl_dev *pctldev, unsigned pin)
|
|
{
|
|
unsigned long config;
|
|
int i;
|
|
for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
|
|
config = pinconf_to_config_packed(pcs_bias[i], 0);
|
|
pcs_pinconf_set(pctldev, pin, config);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check whether PIN_CONFIG_BIAS_DISABLE is valid.
|
|
* It's depend on that PULL_DOWN & PULL_UP configs are all invalid.
|
|
*/
|
|
static bool pcs_pinconf_bias_disable(struct pinctrl_dev *pctldev, unsigned pin)
|
|
{
|
|
unsigned long config;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pcs_bias); i++) {
|
|
config = pinconf_to_config_packed(pcs_bias[i], 0);
|
|
if (!pcs_pinconf_get(pctldev, pin, &config))
|
|
goto out;
|
|
}
|
|
return true;
|
|
out:
|
|
return false;
|
|
}
|
|
|
|
static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
|
|
unsigned pin, unsigned long *config)
|
|
{
|
|
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
|
|
struct pcs_function *func;
|
|
enum pin_config_param param;
|
|
unsigned offset = 0, data = 0, i, j, ret;
|
|
|
|
ret = pcs_get_function(pctldev, pin, &func);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < func->nconfs; i++) {
|
|
param = pinconf_to_config_param(*config);
|
|
if (param == PIN_CONFIG_BIAS_DISABLE) {
|
|
if (pcs_pinconf_bias_disable(pctldev, pin)) {
|
|
*config = 0;
|
|
return 0;
|
|
} else {
|
|
return -ENOTSUPP;
|
|
}
|
|
} else if (param != func->conf[i].param) {
|
|
continue;
|
|
}
|
|
|
|
offset = pin * (pcs->width / BITS_PER_BYTE);
|
|
data = pcs->read(pcs->base + offset) & func->conf[i].mask;
|
|
switch (func->conf[i].param) {
|
|
/* 4 parameters */
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
|
|
if ((data != func->conf[i].enable) ||
|
|
(data == func->conf[i].disable))
|
|
return -ENOTSUPP;
|
|
*config = 0;
|
|
break;
|
|
/* 2 parameters */
|
|
case PIN_CONFIG_INPUT_SCHMITT:
|
|
for (j = 0; j < func->nconfs; j++) {
|
|
switch (func->conf[j].param) {
|
|
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
|
|
if (data != func->conf[j].enable)
|
|
return -ENOTSUPP;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
*config = data;
|
|
break;
|
|
case PIN_CONFIG_DRIVE_STRENGTH:
|
|
case PIN_CONFIG_SLEW_RATE:
|
|
default:
|
|
*config = data;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
|
|
unsigned pin, unsigned long config)
|
|
{
|
|
struct pcs_device *pcs = pinctrl_dev_get_drvdata(pctldev);
|
|
struct pcs_function *func;
|
|
unsigned offset = 0, shift = 0, arg = 0, i, data, ret;
|
|
u16 argument;
|
|
|
|
ret = pcs_get_function(pctldev, pin, &func);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < func->nconfs; i++) {
|
|
if (pinconf_to_config_param(config) == func->conf[i].param) {
|
|
offset = pin * (pcs->width / BITS_PER_BYTE);
|
|
data = pcs->read(pcs->base + offset);
|
|
argument = pinconf_to_config_argument(config);
|
|
switch (func->conf[i].param) {
|
|
/* 2 parameters */
|
|
case PIN_CONFIG_INPUT_SCHMITT:
|
|
case PIN_CONFIG_DRIVE_STRENGTH:
|
|
case PIN_CONFIG_SLEW_RATE:
|
|
shift = ffs(func->conf[i].mask) - 1;
|
|
arg = pinconf_to_config_argument(config);
|
|
data &= ~func->conf[i].mask;
|
|
data |= (arg << shift) & func->conf[i].mask;
|
|
break;
|
|
/* 4 parameters */
|
|
case PIN_CONFIG_BIAS_DISABLE:
|
|
pcs_pinconf_clear_bias(pctldev, pin);
|
|
break;
|
|
case PIN_CONFIG_BIAS_PULL_DOWN:
|
|
case PIN_CONFIG_BIAS_PULL_UP:
|
|
if (argument)
|
|
pcs_pinconf_clear_bias(pctldev, pin);
|
|
/* fall through */
|
|
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
|
|
data &= ~func->conf[i].mask;
|
|
if (argument)
|
|
data |= func->conf[i].enable;
|
|
else
|
|
data |= func->conf[i].disable;
|
|
break;
|
|
default:
|
|
return -ENOTSUPP;
|
|
}
|
|
pcs->write(data, pcs->base + offset);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
|
|
unsigned group, unsigned long *config)
|
|
{
|
|
const unsigned *pins;
|
|
unsigned npins, old = 0;
|
|
int i, ret;
|
|
|
|
ret = pcs_get_group_pins(pctldev, group, &pins, &npins);
|
|
if (ret)
|
|
return ret;
|
|
for (i = 0; i < npins; i++) {
|
|
if (pcs_pinconf_get(pctldev, pins[i], config))
|
|
return -ENOTSUPP;
|
|
/* configs do not match between two pins */
|
|
if (i && (old != *config))
|
|
return -ENOTSUPP;
|
|
old = *config;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
|
|
unsigned group, unsigned long config)
|
|
{
|
|
const unsigned *pins;
|
|
unsigned npins;
|
|
int i, ret;
|
|
|
|
ret = pcs_get_group_pins(pctldev, group, &pins, &npins);
|
|
if (ret)
|
|
return ret;
|
|
for (i = 0; i < npins; i++) {
|
|
if (pcs_pinconf_set(pctldev, pins[i], config))
|
|
return -ENOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
|
|
struct seq_file *s, unsigned pin)
|
|
{
|
|
}
|
|
|
|
static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
|
|
struct seq_file *s, unsigned selector)
|
|
{
|
|
}
|
|
|
|
static void pcs_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
|
|
struct seq_file *s,
|
|
unsigned long config)
|
|
{
|
|
pinconf_generic_dump_config(pctldev, s, config);
|
|
}
|
|
|
|
static const struct pinconf_ops pcs_pinconf_ops = {
|
|
.pin_config_get = pcs_pinconf_get,
|
|
.pin_config_set = pcs_pinconf_set,
|
|
.pin_config_group_get = pcs_pinconf_group_get,
|
|
.pin_config_group_set = pcs_pinconf_group_set,
|
|
.pin_config_dbg_show = pcs_pinconf_dbg_show,
|
|
.pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
|
|
.pin_config_config_dbg_show = pcs_pinconf_config_dbg_show,
|
|
};
|
|
|
|
/**
|
|
* pcs_add_pin() - add a pin to the static per controller pin array
|
|
* @pcs: pcs driver instance
|
|
* @offset: register offset from base
|
|
*/
|
|
static int pcs_add_pin(struct pcs_device *pcs, unsigned offset)
|
|
{
|
|
struct pinctrl_pin_desc *pin;
|
|
struct pcs_name *pn;
|
|
int i;
|
|
|
|
i = pcs->pins.cur;
|
|
if (i >= pcs->desc.npins) {
|
|
dev_err(pcs->dev, "too many pins, max %i\n",
|
|
pcs->desc.npins);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pin = &pcs->pins.pa[i];
|
|
pn = &pcs->names[i];
|
|
sprintf(pn->name, "%lx",
|
|
(unsigned long)pcs->res->start + offset);
|
|
pin->name = pn->name;
|
|
pin->number = i;
|
|
pcs->pins.cur++;
|
|
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
|
|
* @pcs: pcs driver instance
|
|
*
|
|
* In case of errors, resources are freed in pcs_free_resources.
|
|
*
|
|
* If your hardware needs holes in the address space, then just set
|
|
* up multiple driver instances.
|
|
*/
|
|
static int pcs_allocate_pin_table(struct pcs_device *pcs)
|
|
{
|
|
int mux_bytes, nr_pins, i;
|
|
|
|
mux_bytes = pcs->width / BITS_PER_BYTE;
|
|
nr_pins = pcs->size / mux_bytes;
|
|
|
|
dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
|
|
pcs->pins.pa = devm_kzalloc(pcs->dev,
|
|
sizeof(*pcs->pins.pa) * nr_pins,
|
|
GFP_KERNEL);
|
|
if (!pcs->pins.pa)
|
|
return -ENOMEM;
|
|
|
|
pcs->names = devm_kzalloc(pcs->dev,
|
|
sizeof(struct pcs_name) * nr_pins,
|
|
GFP_KERNEL);
|
|
if (!pcs->names)
|
|
return -ENOMEM;
|
|
|
|
pcs->desc.pins = pcs->pins.pa;
|
|
pcs->desc.npins = nr_pins;
|
|
|
|
for (i = 0; i < pcs->desc.npins; i++) {
|
|
unsigned offset;
|
|
int res;
|
|
|
|
offset = i * mux_bytes;
|
|
res = pcs_add_pin(pcs, offset);
|
|
if (res < 0) {
|
|
dev_err(pcs->dev, "error adding pins: %i\n", res);
|
|
return res;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcs_add_function() - adds a new function to the function list
|
|
* @pcs: pcs driver instance
|
|
* @np: device node of the mux entry
|
|
* @name: name of the function
|
|
* @vals: array of mux register value pairs used by the function
|
|
* @nvals: number of mux register value pairs
|
|
* @pgnames: array of pingroup names for the function
|
|
* @npgnames: number of pingroup names
|
|
*/
|
|
static struct pcs_function *pcs_add_function(struct pcs_device *pcs,
|
|
struct device_node *np,
|
|
const char *name,
|
|
struct pcs_func_vals *vals,
|
|
unsigned nvals,
|
|
const char **pgnames,
|
|
unsigned npgnames)
|
|
{
|
|
struct pcs_function *function;
|
|
|
|
function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
|
|
if (!function)
|
|
return NULL;
|
|
|
|
function->name = name;
|
|
function->vals = vals;
|
|
function->nvals = nvals;
|
|
function->pgnames = pgnames;
|
|
function->npgnames = npgnames;
|
|
|
|
mutex_lock(&pcs->mutex);
|
|
list_add_tail(&function->node, &pcs->functions);
|
|
radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
|
|
pcs->nfuncs++;
|
|
mutex_unlock(&pcs->mutex);
|
|
|
|
return function;
|
|
}
|
|
|
|
static void pcs_remove_function(struct pcs_device *pcs,
|
|
struct pcs_function *function)
|
|
{
|
|
int i;
|
|
|
|
mutex_lock(&pcs->mutex);
|
|
for (i = 0; i < pcs->nfuncs; i++) {
|
|
struct pcs_function *found;
|
|
|
|
found = radix_tree_lookup(&pcs->ftree, i);
|
|
if (found == function)
|
|
radix_tree_delete(&pcs->ftree, i);
|
|
}
|
|
list_del(&function->node);
|
|
mutex_unlock(&pcs->mutex);
|
|
}
|
|
|
|
/**
|
|
* pcs_add_pingroup() - add a pingroup to the pingroup list
|
|
* @pcs: pcs driver instance
|
|
* @np: device node of the mux entry
|
|
* @name: name of the pingroup
|
|
* @gpins: array of the pins that belong to the group
|
|
* @ngpins: number of pins in the group
|
|
*/
|
|
static int pcs_add_pingroup(struct pcs_device *pcs,
|
|
struct device_node *np,
|
|
const char *name,
|
|
int *gpins,
|
|
int ngpins)
|
|
{
|
|
struct pcs_pingroup *pingroup;
|
|
|
|
pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
|
|
if (!pingroup)
|
|
return -ENOMEM;
|
|
|
|
pingroup->name = name;
|
|
pingroup->np = np;
|
|
pingroup->gpins = gpins;
|
|
pingroup->ngpins = ngpins;
|
|
|
|
mutex_lock(&pcs->mutex);
|
|
list_add_tail(&pingroup->node, &pcs->pingroups);
|
|
radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
|
|
pcs->ngroups++;
|
|
mutex_unlock(&pcs->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcs_get_pin_by_offset() - get a pin index based on the register offset
|
|
* @pcs: pcs driver instance
|
|
* @offset: register offset from the base
|
|
*
|
|
* Note that this is OK as long as the pins are in a static array.
|
|
*/
|
|
static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
|
|
{
|
|
unsigned index;
|
|
|
|
if (offset >= pcs->size) {
|
|
dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
|
|
offset, pcs->size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
index = offset / (pcs->width / BITS_PER_BYTE);
|
|
|
|
return index;
|
|
}
|
|
|
|
/*
|
|
* check whether data matches enable bits or disable bits
|
|
* Return value: 1 for matching enable bits, 0 for matching disable bits,
|
|
* and negative value for matching failure.
|
|
*/
|
|
static int pcs_config_match(unsigned data, unsigned enable, unsigned disable)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
if (data == enable)
|
|
ret = 1;
|
|
else if (data == disable)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void add_config(struct pcs_conf_vals **conf, enum pin_config_param param,
|
|
unsigned value, unsigned enable, unsigned disable,
|
|
unsigned mask)
|
|
{
|
|
(*conf)->param = param;
|
|
(*conf)->val = value;
|
|
(*conf)->enable = enable;
|
|
(*conf)->disable = disable;
|
|
(*conf)->mask = mask;
|
|
(*conf)++;
|
|
}
|
|
|
|
static void add_setting(unsigned long **setting, enum pin_config_param param,
|
|
unsigned arg)
|
|
{
|
|
**setting = pinconf_to_config_packed(param, arg);
|
|
(*setting)++;
|
|
}
|
|
|
|
/* add pinconf setting with 2 parameters */
|
|
static void pcs_add_conf2(struct pcs_device *pcs, struct device_node *np,
|
|
const char *name, enum pin_config_param param,
|
|
struct pcs_conf_vals **conf, unsigned long **settings)
|
|
{
|
|
unsigned value[2];
|
|
int ret;
|
|
|
|
ret = of_property_read_u32_array(np, name, value, 2);
|
|
if (ret)
|
|
return;
|
|
/* set value & mask */
|
|
value[0] &= value[1];
|
|
/* skip enable & disable */
|
|
add_config(conf, param, value[0], 0, 0, value[1]);
|
|
add_setting(settings, param, value[0]);
|
|
}
|
|
|
|
/* add pinconf setting with 4 parameters */
|
|
static void pcs_add_conf4(struct pcs_device *pcs, struct device_node *np,
|
|
const char *name, enum pin_config_param param,
|
|
struct pcs_conf_vals **conf, unsigned long **settings)
|
|
{
|
|
unsigned value[4];
|
|
int ret;
|
|
|
|
/* value to set, enable, disable, mask */
|
|
ret = of_property_read_u32_array(np, name, value, 4);
|
|
if (ret)
|
|
return;
|
|
if (!value[3]) {
|
|
dev_err(pcs->dev, "mask field of the property can't be 0\n");
|
|
return;
|
|
}
|
|
value[0] &= value[3];
|
|
value[1] &= value[3];
|
|
value[2] &= value[3];
|
|
ret = pcs_config_match(value[0], value[1], value[2]);
|
|
if (ret < 0)
|
|
dev_dbg(pcs->dev, "failed to match enable or disable bits\n");
|
|
add_config(conf, param, value[0], value[1], value[2], value[3]);
|
|
add_setting(settings, param, ret);
|
|
}
|
|
|
|
static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np,
|
|
struct pcs_function *func,
|
|
struct pinctrl_map **map)
|
|
|
|
{
|
|
struct pinctrl_map *m = *map;
|
|
int i = 0, nconfs = 0;
|
|
unsigned long *settings = NULL, *s = NULL;
|
|
struct pcs_conf_vals *conf = NULL;
|
|
struct pcs_conf_type prop2[] = {
|
|
{ "pinctrl-single,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, },
|
|
{ "pinctrl-single,slew-rate", PIN_CONFIG_SLEW_RATE, },
|
|
{ "pinctrl-single,input-schmitt", PIN_CONFIG_INPUT_SCHMITT, },
|
|
};
|
|
struct pcs_conf_type prop4[] = {
|
|
{ "pinctrl-single,bias-pullup", PIN_CONFIG_BIAS_PULL_UP, },
|
|
{ "pinctrl-single,bias-pulldown", PIN_CONFIG_BIAS_PULL_DOWN, },
|
|
{ "pinctrl-single,input-schmitt-enable",
|
|
PIN_CONFIG_INPUT_SCHMITT_ENABLE, },
|
|
};
|
|
|
|
/* If pinconf isn't supported, don't parse properties in below. */
|
|
if (!pcs->is_pinconf)
|
|
return 0;
|
|
|
|
/* cacluate how much properties are supported in current node */
|
|
for (i = 0; i < ARRAY_SIZE(prop2); i++) {
|
|
if (of_find_property(np, prop2[i].name, NULL))
|
|
nconfs++;
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(prop4); i++) {
|
|
if (of_find_property(np, prop4[i].name, NULL))
|
|
nconfs++;
|
|
}
|
|
if (!nconfs)
|
|
return 0;
|
|
|
|
func->conf = devm_kzalloc(pcs->dev,
|
|
sizeof(struct pcs_conf_vals) * nconfs,
|
|
GFP_KERNEL);
|
|
if (!func->conf)
|
|
return -ENOMEM;
|
|
func->nconfs = nconfs;
|
|
conf = &(func->conf[0]);
|
|
m++;
|
|
settings = devm_kzalloc(pcs->dev, sizeof(unsigned long) * nconfs,
|
|
GFP_KERNEL);
|
|
if (!settings)
|
|
return -ENOMEM;
|
|
s = &settings[0];
|
|
|
|
for (i = 0; i < ARRAY_SIZE(prop2); i++)
|
|
pcs_add_conf2(pcs, np, prop2[i].name, prop2[i].param,
|
|
&conf, &s);
|
|
for (i = 0; i < ARRAY_SIZE(prop4); i++)
|
|
pcs_add_conf4(pcs, np, prop4[i].name, prop4[i].param,
|
|
&conf, &s);
|
|
m->type = PIN_MAP_TYPE_CONFIGS_GROUP;
|
|
m->data.configs.group_or_pin = np->name;
|
|
m->data.configs.configs = settings;
|
|
m->data.configs.num_configs = nconfs;
|
|
return 0;
|
|
}
|
|
|
|
static void pcs_free_pingroups(struct pcs_device *pcs);
|
|
|
|
/**
|
|
* smux_parse_one_pinctrl_entry() - parses a device tree mux entry
|
|
* @pcs: pinctrl driver instance
|
|
* @np: device node of the mux entry
|
|
* @map: map entry
|
|
* @num_maps: number of map
|
|
* @pgnames: pingroup names
|
|
*
|
|
* Note that this binding currently supports only sets of one register + value.
|
|
*
|
|
* Also note that this driver tries to avoid understanding pin and function
|
|
* names because of the extra bloat they would cause especially in the case of
|
|
* a large number of pins. This driver just sets what is specified for the board
|
|
* in the .dts file. Further user space debugging tools can be developed to
|
|
* decipher the pin and function names using debugfs.
|
|
*
|
|
* If you are concerned about the boot time, set up the static pins in
|
|
* the bootloader, and only set up selected pins as device tree entries.
|
|
*/
|
|
static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
|
|
struct device_node *np,
|
|
struct pinctrl_map **map,
|
|
unsigned *num_maps,
|
|
const char **pgnames)
|
|
{
|
|
struct pcs_func_vals *vals;
|
|
const __be32 *mux;
|
|
int size, params, rows, *pins, index = 0, found = 0, res = -ENOMEM;
|
|
struct pcs_function *function;
|
|
|
|
if (pcs->bits_per_mux) {
|
|
params = 3;
|
|
mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
|
|
} else {
|
|
params = 2;
|
|
mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
|
|
}
|
|
|
|
if (!mux) {
|
|
dev_err(pcs->dev, "no valid property for %s\n", np->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (size < (sizeof(*mux) * params)) {
|
|
dev_err(pcs->dev, "bad data for %s\n", np->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
size /= sizeof(*mux); /* Number of elements in array */
|
|
rows = size / params;
|
|
|
|
vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
|
|
if (!vals)
|
|
return -ENOMEM;
|
|
|
|
pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
|
|
if (!pins)
|
|
goto free_vals;
|
|
|
|
while (index < size) {
|
|
unsigned offset, val;
|
|
int pin;
|
|
|
|
offset = be32_to_cpup(mux + index++);
|
|
val = be32_to_cpup(mux + index++);
|
|
vals[found].reg = pcs->base + offset;
|
|
vals[found].val = val;
|
|
if (params == 3) {
|
|
val = be32_to_cpup(mux + index++);
|
|
vals[found].mask = val;
|
|
}
|
|
|
|
pin = pcs_get_pin_by_offset(pcs, offset);
|
|
if (pin < 0) {
|
|
dev_err(pcs->dev,
|
|
"could not add functions for %s %ux\n",
|
|
np->name, offset);
|
|
break;
|
|
}
|
|
pins[found++] = pin;
|
|
}
|
|
|
|
pgnames[0] = np->name;
|
|
function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
|
|
if (!function)
|
|
goto free_pins;
|
|
|
|
res = pcs_add_pingroup(pcs, np, np->name, pins, found);
|
|
if (res < 0)
|
|
goto free_function;
|
|
|
|
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
|
|
(*map)->data.mux.group = np->name;
|
|
(*map)->data.mux.function = np->name;
|
|
|
|
if (pcs->is_pinconf) {
|
|
if (pcs_parse_pinconf(pcs, np, function, map))
|
|
goto free_pingroups;
|
|
*num_maps = 2;
|
|
} else {
|
|
*num_maps = 1;
|
|
}
|
|
return 0;
|
|
|
|
free_pingroups:
|
|
pcs_free_pingroups(pcs);
|
|
*num_maps = 1;
|
|
free_function:
|
|
pcs_remove_function(pcs, function);
|
|
|
|
free_pins:
|
|
devm_kfree(pcs->dev, pins);
|
|
|
|
free_vals:
|
|
devm_kfree(pcs->dev, vals);
|
|
|
|
return res;
|
|
}
|
|
/**
|
|
* pcs_dt_node_to_map() - allocates and parses pinctrl maps
|
|
* @pctldev: pinctrl instance
|
|
* @np_config: device tree pinmux entry
|
|
* @map: array of map entries
|
|
* @num_maps: number of maps
|
|
*/
|
|
static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
|
|
struct device_node *np_config,
|
|
struct pinctrl_map **map, unsigned *num_maps)
|
|
{
|
|
struct pcs_device *pcs;
|
|
const char **pgnames;
|
|
int ret;
|
|
|
|
pcs = pinctrl_dev_get_drvdata(pctldev);
|
|
|
|
/* create 2 maps. One is for pinmux, and the other is for pinconf. */
|
|
*map = devm_kzalloc(pcs->dev, sizeof(**map) * 2, GFP_KERNEL);
|
|
if (!*map)
|
|
return -ENOMEM;
|
|
|
|
*num_maps = 0;
|
|
|
|
pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
|
|
if (!pgnames) {
|
|
ret = -ENOMEM;
|
|
goto free_map;
|
|
}
|
|
|
|
ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map, num_maps,
|
|
pgnames);
|
|
if (ret < 0) {
|
|
dev_err(pcs->dev, "no pins entries for %s\n",
|
|
np_config->name);
|
|
goto free_pgnames;
|
|
}
|
|
|
|
return 0;
|
|
|
|
free_pgnames:
|
|
devm_kfree(pcs->dev, pgnames);
|
|
free_map:
|
|
devm_kfree(pcs->dev, *map);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pcs_free_funcs() - free memory used by functions
|
|
* @pcs: pcs driver instance
|
|
*/
|
|
static void pcs_free_funcs(struct pcs_device *pcs)
|
|
{
|
|
struct list_head *pos, *tmp;
|
|
int i;
|
|
|
|
mutex_lock(&pcs->mutex);
|
|
for (i = 0; i < pcs->nfuncs; i++) {
|
|
struct pcs_function *func;
|
|
|
|
func = radix_tree_lookup(&pcs->ftree, i);
|
|
if (!func)
|
|
continue;
|
|
radix_tree_delete(&pcs->ftree, i);
|
|
}
|
|
list_for_each_safe(pos, tmp, &pcs->functions) {
|
|
struct pcs_function *function;
|
|
|
|
function = list_entry(pos, struct pcs_function, node);
|
|
list_del(&function->node);
|
|
}
|
|
mutex_unlock(&pcs->mutex);
|
|
}
|
|
|
|
/**
|
|
* pcs_free_pingroups() - free memory used by pingroups
|
|
* @pcs: pcs driver instance
|
|
*/
|
|
static void pcs_free_pingroups(struct pcs_device *pcs)
|
|
{
|
|
struct list_head *pos, *tmp;
|
|
int i;
|
|
|
|
mutex_lock(&pcs->mutex);
|
|
for (i = 0; i < pcs->ngroups; i++) {
|
|
struct pcs_pingroup *pingroup;
|
|
|
|
pingroup = radix_tree_lookup(&pcs->pgtree, i);
|
|
if (!pingroup)
|
|
continue;
|
|
radix_tree_delete(&pcs->pgtree, i);
|
|
}
|
|
list_for_each_safe(pos, tmp, &pcs->pingroups) {
|
|
struct pcs_pingroup *pingroup;
|
|
|
|
pingroup = list_entry(pos, struct pcs_pingroup, node);
|
|
list_del(&pingroup->node);
|
|
}
|
|
mutex_unlock(&pcs->mutex);
|
|
}
|
|
|
|
/**
|
|
* pcs_free_resources() - free memory used by this driver
|
|
* @pcs: pcs driver instance
|
|
*/
|
|
static void pcs_free_resources(struct pcs_device *pcs)
|
|
{
|
|
if (pcs->pctl)
|
|
pinctrl_unregister(pcs->pctl);
|
|
|
|
pcs_free_funcs(pcs);
|
|
pcs_free_pingroups(pcs);
|
|
}
|
|
|
|
#define PCS_GET_PROP_U32(name, reg, err) \
|
|
do { \
|
|
ret = of_property_read_u32(np, name, reg); \
|
|
if (ret) { \
|
|
dev_err(pcs->dev, err); \
|
|
return ret; \
|
|
} \
|
|
} while (0);
|
|
|
|
static struct of_device_id pcs_of_match[];
|
|
|
|
static int pcs_add_gpio_func(struct device_node *node, struct pcs_device *pcs)
|
|
{
|
|
const char *propname = "pinctrl-single,gpio-range";
|
|
const char *cellname = "#pinctrl-single,gpio-range-cells";
|
|
struct of_phandle_args gpiospec;
|
|
struct pcs_gpiofunc_range *range;
|
|
int ret, i;
|
|
|
|
for (i = 0; ; i++) {
|
|
ret = of_parse_phandle_with_args(node, propname, cellname,
|
|
i, &gpiospec);
|
|
/* Do not treat it as error. Only treat it as end condition. */
|
|
if (ret) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
range = devm_kzalloc(pcs->dev, sizeof(*range), GFP_KERNEL);
|
|
if (!range) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
range->offset = gpiospec.args[0];
|
|
range->npins = gpiospec.args[1];
|
|
range->gpiofunc = gpiospec.args[2];
|
|
mutex_lock(&pcs->mutex);
|
|
list_add_tail(&range->node, &pcs->gpiofuncs);
|
|
mutex_unlock(&pcs->mutex);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int pcs_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct of_device_id *match;
|
|
struct resource *res;
|
|
struct pcs_device *pcs;
|
|
int ret;
|
|
|
|
match = of_match_device(pcs_of_match, &pdev->dev);
|
|
if (!match)
|
|
return -EINVAL;
|
|
|
|
pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
|
|
if (!pcs) {
|
|
dev_err(&pdev->dev, "could not allocate\n");
|
|
return -ENOMEM;
|
|
}
|
|
pcs->dev = &pdev->dev;
|
|
mutex_init(&pcs->mutex);
|
|
INIT_LIST_HEAD(&pcs->pingroups);
|
|
INIT_LIST_HEAD(&pcs->functions);
|
|
INIT_LIST_HEAD(&pcs->gpiofuncs);
|
|
pcs->is_pinconf = match->data;
|
|
|
|
PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
|
|
"register width not specified\n");
|
|
|
|
ret = of_property_read_u32(np, "pinctrl-single,function-mask",
|
|
&pcs->fmask);
|
|
if (!ret) {
|
|
pcs->fshift = ffs(pcs->fmask) - 1;
|
|
pcs->fmax = pcs->fmask >> pcs->fshift;
|
|
} else {
|
|
/* If mask property doesn't exist, function mux is invalid. */
|
|
pcs->fmask = 0;
|
|
pcs->fshift = 0;
|
|
pcs->fmax = 0;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "pinctrl-single,function-off",
|
|
&pcs->foff);
|
|
if (ret)
|
|
pcs->foff = PCS_OFF_DISABLED;
|
|
|
|
pcs->bits_per_mux = of_property_read_bool(np,
|
|
"pinctrl-single,bit-per-mux");
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(pcs->dev, "could not get resource\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pcs->res = devm_request_mem_region(pcs->dev, res->start,
|
|
resource_size(res), DRIVER_NAME);
|
|
if (!pcs->res) {
|
|
dev_err(pcs->dev, "could not get mem_region\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
pcs->size = resource_size(pcs->res);
|
|
pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
|
|
if (!pcs->base) {
|
|
dev_err(pcs->dev, "could not ioremap\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
|
|
INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
|
|
platform_set_drvdata(pdev, pcs);
|
|
|
|
switch (pcs->width) {
|
|
case 8:
|
|
pcs->read = pcs_readb;
|
|
pcs->write = pcs_writeb;
|
|
break;
|
|
case 16:
|
|
pcs->read = pcs_readw;
|
|
pcs->write = pcs_writew;
|
|
break;
|
|
case 32:
|
|
pcs->read = pcs_readl;
|
|
pcs->write = pcs_writel;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
pcs->desc.name = DRIVER_NAME;
|
|
pcs->desc.pctlops = &pcs_pinctrl_ops;
|
|
pcs->desc.pmxops = &pcs_pinmux_ops;
|
|
pcs->desc.confops = &pcs_pinconf_ops;
|
|
pcs->desc.owner = THIS_MODULE;
|
|
if (match->data)
|
|
pcs_pinconf_ops.is_generic = true;
|
|
|
|
ret = pcs_allocate_pin_table(pcs);
|
|
if (ret < 0)
|
|
goto free;
|
|
|
|
pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
|
|
if (!pcs->pctl) {
|
|
dev_err(pcs->dev, "could not register single pinctrl driver\n");
|
|
ret = -EINVAL;
|
|
goto free;
|
|
}
|
|
|
|
ret = pcs_add_gpio_func(np, pcs);
|
|
if (ret < 0)
|
|
goto free;
|
|
|
|
dev_info(pcs->dev, "%i pins at pa %p size %u\n",
|
|
pcs->desc.npins, pcs->base, pcs->size);
|
|
|
|
return 0;
|
|
|
|
free:
|
|
pcs_free_resources(pcs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pcs_remove(struct platform_device *pdev)
|
|
{
|
|
struct pcs_device *pcs = platform_get_drvdata(pdev);
|
|
|
|
if (!pcs)
|
|
return 0;
|
|
|
|
pcs_free_resources(pcs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id pcs_of_match[] = {
|
|
{ .compatible = "pinctrl-single", .data = (void *)false },
|
|
{ .compatible = "pinconf-single", .data = (void *)true },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pcs_of_match);
|
|
|
|
static struct platform_driver pcs_driver = {
|
|
.probe = pcs_probe,
|
|
.remove = pcs_remove,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = pcs_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(pcs_driver);
|
|
|
|
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
|
|
MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
|
|
MODULE_LICENSE("GPL v2");
|