mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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379 lines
9.2 KiB
C
379 lines
9.2 KiB
C
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/*
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* Driver for Conexant Digicolor General Purpose Pin Mapping
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*
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* Author: Baruch Siach <baruch@tkos.co.il>
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*
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* Copyright (C) 2015 Paradox Innovation Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* TODO:
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* - GPIO interrupt support
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* - Pin pad configuration (pull up/down, strength)
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/gpio/driver.h>
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#include <linux/spinlock.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include "pinctrl-utils.h"
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#define DRIVER_NAME "pinctrl-digicolor"
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#define GP_CLIENTSEL(clct) ((clct)*8 + 0x20)
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#define GP_DRIVE0(clct) (GP_CLIENTSEL(clct) + 2)
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#define GP_OUTPUT0(clct) (GP_CLIENTSEL(clct) + 3)
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#define GP_INPUT(clct) (GP_CLIENTSEL(clct) + 6)
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#define PIN_COLLECTIONS ('R' - 'A' + 1)
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#define PINS_PER_COLLECTION 8
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#define PINS_COUNT (PIN_COLLECTIONS * PINS_PER_COLLECTION)
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struct dc_pinmap {
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void __iomem *regs;
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struct device *dev;
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struct pinctrl_dev *pctl;
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struct pinctrl_desc *desc;
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const char *pin_names[PINS_COUNT];
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struct gpio_chip chip;
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spinlock_t lock;
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};
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static int dc_get_groups_count(struct pinctrl_dev *pctldev)
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{
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return PINS_COUNT;
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}
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static const char *dc_get_group_name(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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struct dc_pinmap *pmap = pinctrl_dev_get_drvdata(pctldev);
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/* Exactly one group per pin */
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return pmap->desc->pins[selector].name;
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}
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static int dc_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
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const unsigned **pins,
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unsigned *num_pins)
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{
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struct dc_pinmap *pmap = pinctrl_dev_get_drvdata(pctldev);
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*pins = &pmap->desc->pins[selector].number;
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*num_pins = 1;
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return 0;
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}
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static struct pinctrl_ops dc_pinctrl_ops = {
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.get_groups_count = dc_get_groups_count,
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.get_group_name = dc_get_group_name,
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.get_group_pins = dc_get_group_pins,
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.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
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.dt_free_map = pinctrl_utils_dt_free_map,
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};
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static const char *const dc_functions[] = {
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"gpio",
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"client_a",
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"client_b",
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"client_c",
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};
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static int dc_get_functions_count(struct pinctrl_dev *pctldev)
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{
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return ARRAY_SIZE(dc_functions);
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}
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static const char *dc_get_fname(struct pinctrl_dev *pctldev, unsigned selector)
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{
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return dc_functions[selector];
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}
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static int dc_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct dc_pinmap *pmap = pinctrl_dev_get_drvdata(pctldev);
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*groups = pmap->pin_names;
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*num_groups = PINS_COUNT;
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return 0;
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}
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static void dc_client_sel(int pin_num, int *reg, int *bit)
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{
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*bit = (pin_num % PINS_PER_COLLECTION) * 2;
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*reg = GP_CLIENTSEL(pin_num/PINS_PER_COLLECTION);
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if (*bit >= PINS_PER_COLLECTION) {
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*bit -= PINS_PER_COLLECTION;
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*reg += 1;
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}
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}
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static int dc_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
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unsigned group)
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{
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struct dc_pinmap *pmap = pinctrl_dev_get_drvdata(pctldev);
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int bit_off, reg_off;
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u8 reg;
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dc_client_sel(group, ®_off, &bit_off);
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reg = readb_relaxed(pmap->regs + reg_off);
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reg &= ~(3 << bit_off);
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reg |= (selector << bit_off);
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writeb_relaxed(reg, pmap->regs + reg_off);
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return 0;
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}
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static int dc_pmx_request_gpio(struct pinctrl_dev *pcdev,
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struct pinctrl_gpio_range *range,
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unsigned offset)
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{
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struct dc_pinmap *pmap = pinctrl_dev_get_drvdata(pcdev);
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int bit_off, reg_off;
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u8 reg;
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dc_client_sel(offset, ®_off, &bit_off);
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reg = readb_relaxed(pmap->regs + reg_off);
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if ((reg & (3 << bit_off)) != 0)
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return -EBUSY;
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return 0;
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}
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static struct pinmux_ops dc_pmxops = {
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.get_functions_count = dc_get_functions_count,
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.get_function_name = dc_get_fname,
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.get_function_groups = dc_get_groups,
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.set_mux = dc_set_mux,
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.gpio_request_enable = dc_pmx_request_gpio,
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};
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static int dc_gpio_request(struct gpio_chip *chip, unsigned gpio)
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{
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return pinctrl_request_gpio(chip->base + gpio);
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}
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static void dc_gpio_free(struct gpio_chip *chip, unsigned gpio)
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{
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pinctrl_free_gpio(chip->base + gpio);
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}
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static int dc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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struct dc_pinmap *pmap = container_of(chip, struct dc_pinmap, chip);
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int reg_off = GP_DRIVE0(gpio/PINS_PER_COLLECTION);
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int bit_off = gpio % PINS_PER_COLLECTION;
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u8 drive;
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unsigned long flags;
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spin_lock_irqsave(&pmap->lock, flags);
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drive = readb_relaxed(pmap->regs + reg_off);
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drive &= ~BIT(bit_off);
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writeb_relaxed(drive, pmap->regs + reg_off);
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spin_unlock_irqrestore(&pmap->lock, flags);
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return 0;
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}
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static void dc_gpio_set(struct gpio_chip *chip, unsigned gpio, int value);
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static int dc_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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struct dc_pinmap *pmap = container_of(chip, struct dc_pinmap, chip);
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int reg_off = GP_DRIVE0(gpio/PINS_PER_COLLECTION);
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int bit_off = gpio % PINS_PER_COLLECTION;
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u8 drive;
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unsigned long flags;
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dc_gpio_set(chip, gpio, value);
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spin_lock_irqsave(&pmap->lock, flags);
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drive = readb_relaxed(pmap->regs + reg_off);
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drive |= BIT(bit_off);
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writeb_relaxed(drive, pmap->regs + reg_off);
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spin_unlock_irqrestore(&pmap->lock, flags);
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return 0;
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}
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static int dc_gpio_get(struct gpio_chip *chip, unsigned gpio)
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{
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struct dc_pinmap *pmap = container_of(chip, struct dc_pinmap, chip);
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int reg_off = GP_INPUT(gpio/PINS_PER_COLLECTION);
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int bit_off = gpio % PINS_PER_COLLECTION;
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u8 input;
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input = readb_relaxed(pmap->regs + reg_off);
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return !!(input & BIT(bit_off));
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}
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static void dc_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
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{
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struct dc_pinmap *pmap = container_of(chip, struct dc_pinmap, chip);
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int reg_off = GP_OUTPUT0(gpio/PINS_PER_COLLECTION);
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int bit_off = gpio % PINS_PER_COLLECTION;
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u8 output;
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unsigned long flags;
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spin_lock_irqsave(&pmap->lock, flags);
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output = readb_relaxed(pmap->regs + reg_off);
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if (value)
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output |= BIT(bit_off);
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else
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output &= ~BIT(bit_off);
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writeb_relaxed(output, pmap->regs + reg_off);
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spin_unlock_irqrestore(&pmap->lock, flags);
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}
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static int dc_gpiochip_add(struct dc_pinmap *pmap, struct device_node *np)
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{
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struct gpio_chip *chip = &pmap->chip;
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int ret;
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chip->label = DRIVER_NAME;
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chip->dev = pmap->dev;
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chip->request = dc_gpio_request;
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chip->free = dc_gpio_free;
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chip->direction_input = dc_gpio_direction_input;
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chip->direction_output = dc_gpio_direction_output;
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chip->get = dc_gpio_get;
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chip->set = dc_gpio_set;
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chip->base = -1;
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chip->ngpio = PINS_COUNT;
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chip->of_node = np;
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chip->of_gpio_n_cells = 2;
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spin_lock_init(&pmap->lock);
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ret = gpiochip_add(chip);
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if (ret < 0)
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return ret;
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ret = gpiochip_add_pin_range(chip, dev_name(pmap->dev), 0, 0,
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PINS_COUNT);
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if (ret < 0) {
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gpiochip_remove(chip);
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return ret;
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}
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return 0;
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}
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static int dc_pinctrl_probe(struct platform_device *pdev)
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{
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struct dc_pinmap *pmap;
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struct resource *r;
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struct pinctrl_pin_desc *pins;
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struct pinctrl_desc *pctl_desc;
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char *pin_names;
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int name_len = strlen("GP_xx") + 1;
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int i, j, ret;
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pmap = devm_kzalloc(&pdev->dev, sizeof(*pmap), GFP_KERNEL);
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if (!pmap)
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return -ENOMEM;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pmap->regs = devm_ioremap_resource(&pdev->dev, r);
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if (IS_ERR(pmap->regs))
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return PTR_ERR(pmap->regs);
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pins = devm_kzalloc(&pdev->dev, sizeof(*pins)*PINS_COUNT, GFP_KERNEL);
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if (!pins)
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return -ENOMEM;
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pin_names = devm_kzalloc(&pdev->dev, name_len * PINS_COUNT,
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GFP_KERNEL);
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if (!pin_names)
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return -ENOMEM;
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for (i = 0; i < PIN_COLLECTIONS; i++) {
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for (j = 0; j < PINS_PER_COLLECTION; j++) {
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int pin_id = i*PINS_PER_COLLECTION + j;
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char *name = &pin_names[pin_id * name_len];
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snprintf(name, name_len, "GP_%c%c", 'A'+i, '0'+j);
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pins[pin_id].number = pin_id;
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pins[pin_id].name = name;
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pmap->pin_names[pin_id] = name;
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}
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}
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pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
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if (!pctl_desc)
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return -ENOMEM;
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pctl_desc->name = DRIVER_NAME,
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pctl_desc->owner = THIS_MODULE,
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pctl_desc->pctlops = &dc_pinctrl_ops,
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pctl_desc->pmxops = &dc_pmxops,
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pctl_desc->npins = PINS_COUNT;
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pctl_desc->pins = pins;
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pmap->desc = pctl_desc;
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pmap->dev = &pdev->dev;
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pmap->pctl = pinctrl_register(pctl_desc, &pdev->dev, pmap);
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if (!pmap->pctl) {
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dev_err(&pdev->dev, "pinctrl driver registration failed\n");
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return -EINVAL;
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}
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ret = dc_gpiochip_add(pmap, pdev->dev.of_node);
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if (ret < 0) {
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pinctrl_unregister(pmap->pctl);
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return ret;
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}
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return 0;
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}
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static int dc_pinctrl_remove(struct platform_device *pdev)
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{
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struct dc_pinmap *pmap = platform_get_drvdata(pdev);
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pinctrl_unregister(pmap->pctl);
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gpiochip_remove(&pmap->chip);
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return 0;
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}
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static const struct of_device_id dc_pinctrl_ids[] = {
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{ .compatible = "cnxt,cx92755-pinctrl" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, dc_pinctrl_ids);
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static struct platform_driver dc_pinctrl_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = dc_pinctrl_ids,
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},
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.probe = dc_pinctrl_probe,
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.remove = dc_pinctrl_remove,
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};
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module_platform_driver(dc_pinctrl_driver);
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