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Merge branch 'bcm-nsp' into devel
This commit is contained in:
Linus Walleij
commit
fcb59bdf64
80
Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
Normal file
80
Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
Normal file
@ -0,0 +1,80 @@
|
||||
Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
|
||||
|
||||
Required properties:
|
||||
- compatible:
|
||||
Must be "brcm,nsp-gpio-a"
|
||||
|
||||
- reg:
|
||||
Should contain the register physical address and length for each of
|
||||
GPIO base, IO control registers
|
||||
|
||||
- #gpio-cells:
|
||||
Must be two. The first cell is the GPIO pin number (within the
|
||||
controller's pin space) and the second cell is used for the following:
|
||||
bit[0]: polarity (0 for active high and 1 for active low)
|
||||
|
||||
- gpio-controller:
|
||||
Specifies that the node is a GPIO controller
|
||||
|
||||
- ngpios:
|
||||
Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
|
||||
|
||||
Optional properties:
|
||||
- interrupts:
|
||||
Interrupt ID
|
||||
|
||||
- interrupt-controller:
|
||||
Specifies that the node is an interrupt controller
|
||||
|
||||
- gpio-ranges:
|
||||
Specifies the mapping between gpio controller and pin-controllers pins.
|
||||
This requires 4 fields in cells defined as -
|
||||
1. Phandle of pin-controller.
|
||||
2. GPIO base pin offset.
|
||||
3 Pin-control base pin offset.
|
||||
4. number of gpio pins which are linearly mapped from pin base.
|
||||
|
||||
Supported generic PINCONF properties in child nodes:
|
||||
- pins:
|
||||
The list of pins (within the controller's own pin space) that properties
|
||||
in the node apply to. Pin names are "gpio-<pin>"
|
||||
|
||||
- bias-disable:
|
||||
Disable pin bias
|
||||
|
||||
- bias-pull-up:
|
||||
Enable internal pull up resistor
|
||||
|
||||
- bias-pull-down:
|
||||
Enable internal pull down resistor
|
||||
|
||||
- drive-strength:
|
||||
Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
|
||||
|
||||
Example:
|
||||
|
||||
gpioa: gpio@18000020 {
|
||||
compatible = "brcm,nsp-gpio-a";
|
||||
reg = <0x18000020 0x100>,
|
||||
<0x1803f1c4 0x1c>;
|
||||
#gpio-cells = <2>;
|
||||
gpio-controller;
|
||||
ngpios = <32>;
|
||||
gpio-ranges = <&pinctrl 0 0 31>;
|
||||
interrupt-controller;
|
||||
interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
|
||||
|
||||
/* Hog a few default settings */
|
||||
pinctrl-names = "default";
|
||||
pinctrl-0 = <&led>;
|
||||
led: led {
|
||||
pins = "gpio-1";
|
||||
bias-pull-up;
|
||||
};
|
||||
|
||||
pwr: pwr {
|
||||
gpio-hog;
|
||||
gpios = <3 1>;
|
||||
output-high;
|
||||
};
|
||||
};
|
||||
@ -68,3 +68,20 @@ config PINCTRL_CYGNUS_MUX
|
||||
The Broadcom Cygnus IOMUX driver supports group based IOMUX
|
||||
configuration, with the exception that certain individual pins
|
||||
can be overrided to GPIO function
|
||||
|
||||
config PINCTRL_NSP_GPIO
|
||||
bool "Broadcom NSP GPIO (with PINCONF) driver"
|
||||
depends on OF_GPIO && (ARCH_BCM_NSP || COMPILE_TEST)
|
||||
select GPIOLIB_IRQCHIP
|
||||
select PINCONF
|
||||
select GENERIC_PINCONF
|
||||
default ARCH_BCM_NSP
|
||||
help
|
||||
Say yes here to enable the Broadcom NSP GPIO driver.
|
||||
|
||||
The Broadcom Northstar Plus SoC ChipcommonA GPIO controller is
|
||||
supported by this driver.
|
||||
|
||||
The ChipcommonA GPIO controller support basic PINCONF functions such
|
||||
as bias pull up, pull down, and drive strength configurations, when
|
||||
these pins are muxed to GPIO.
|
||||
|
||||
@ -4,3 +4,4 @@ obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
|
||||
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
|
||||
obj-$(CONFIG_PINCTRL_IPROC_GPIO) += pinctrl-iproc-gpio.o
|
||||
obj-$(CONFIG_PINCTRL_CYGNUS_MUX) += pinctrl-cygnus-mux.o
|
||||
obj-$(CONFIG_PINCTRL_NSP_GPIO) += pinctrl-nsp-gpio.o
|
||||
|
||||
749
drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
Normal file
749
drivers/pinctrl/bcm/pinctrl-nsp-gpio.c
Normal file
@ -0,0 +1,749 @@
|
||||
/*
|
||||
* Copyright (C) 2015 Broadcom Corporation
|
||||
*
|
||||
* 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 version 2.
|
||||
*
|
||||
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
||||
* kind, whether express or implied; without even the implied warranty
|
||||
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* This file contains the Broadcom Northstar Plus (NSP) GPIO driver that
|
||||
* supports the chipCommonA GPIO controller. Basic PINCONF such as bias,
|
||||
* pull up/down, slew and drive strength are also supported in this driver.
|
||||
*
|
||||
* Pins from the chipCommonA GPIO can be individually muxed to GPIO function,
|
||||
* through the interaction with the NSP IOMUX controller.
|
||||
*/
|
||||
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/pinctrl/pinconf.h>
|
||||
#include <linux/pinctrl/pinconf-generic.h>
|
||||
#include <linux/pinctrl/pinctrl.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include "../pinctrl-utils.h"
|
||||
|
||||
#define NSP_CHIP_A_INT_STATUS 0x00
|
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#define NSP_CHIP_A_INT_MASK 0x04
|
||||
#define NSP_GPIO_DATA_IN 0x40
|
||||
#define NSP_GPIO_DATA_OUT 0x44
|
||||
#define NSP_GPIO_OUT_EN 0x48
|
||||
#define NSP_GPIO_INT_POLARITY 0x50
|
||||
#define NSP_GPIO_INT_MASK 0x54
|
||||
#define NSP_GPIO_EVENT 0x58
|
||||
#define NSP_GPIO_EVENT_INT_MASK 0x5c
|
||||
#define NSP_GPIO_EVENT_INT_POLARITY 0x64
|
||||
#define NSP_CHIP_A_GPIO_INT_BIT 0x01
|
||||
|
||||
/* I/O parameters offset for chipcommon A GPIO */
|
||||
#define NSP_GPIO_DRV_CTRL 0x00
|
||||
#define NSP_GPIO_HYSTERESIS_EN 0x10
|
||||
#define NSP_GPIO_SLEW_RATE_EN 0x14
|
||||
#define NSP_PULL_UP_EN 0x18
|
||||
#define NSP_PULL_DOWN_EN 0x1c
|
||||
#define GPIO_DRV_STRENGTH_BITS 0x03
|
||||
|
||||
/*
|
||||
* nsp GPIO core
|
||||
*
|
||||
* @dev: pointer to device
|
||||
* @base: I/O register base for nsp GPIO controller
|
||||
* @io_ctrl: I/O register base for PINCONF support outside the GPIO block
|
||||
* @gc: GPIO chip
|
||||
* @pctl: pointer to pinctrl_dev
|
||||
* @pctldesc: pinctrl descriptor
|
||||
* @irq_domain: pointer to irq domain
|
||||
* @lock: lock to protect access to I/O registers
|
||||
*/
|
||||
struct nsp_gpio {
|
||||
struct device *dev;
|
||||
void __iomem *base;
|
||||
void __iomem *io_ctrl;
|
||||
struct gpio_chip gc;
|
||||
struct pinctrl_dev *pctl;
|
||||
struct pinctrl_desc pctldesc;
|
||||
struct irq_domain *irq_domain;
|
||||
spinlock_t lock;
|
||||
};
|
||||
|
||||
enum base_type {
|
||||
REG,
|
||||
IO_CTRL
|
||||
};
|
||||
|
||||
static inline struct nsp_gpio *to_nsp_gpio(struct gpio_chip *gc)
|
||||
{
|
||||
return container_of(gc, struct nsp_gpio, gc);
|
||||
}
|
||||
|
||||
/*
|
||||
* Mapping from PINCONF pins to GPIO pins is 1-to-1
|
||||
*/
|
||||
static inline unsigned nsp_pin_to_gpio(unsigned pin)
|
||||
{
|
||||
return pin;
|
||||
}
|
||||
|
||||
/*
|
||||
* nsp_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
|
||||
* nsp GPIO register
|
||||
*
|
||||
* @nsp_gpio: nsp GPIO device
|
||||
* @base_type: reg base to modify
|
||||
* @reg: register offset
|
||||
* @gpio: GPIO pin
|
||||
* @set: set or clear
|
||||
*/
|
||||
static inline void nsp_set_bit(struct nsp_gpio *chip, enum base_type address,
|
||||
unsigned int reg, unsigned gpio, bool set)
|
||||
{
|
||||
u32 val;
|
||||
void __iomem *base_address;
|
||||
|
||||
if (address == IO_CTRL)
|
||||
base_address = chip->io_ctrl;
|
||||
else
|
||||
base_address = chip->base;
|
||||
|
||||
val = readl(base_address + reg);
|
||||
if (set)
|
||||
val |= BIT(gpio);
|
||||
else
|
||||
val &= ~BIT(gpio);
|
||||
|
||||
writel(val, base_address + reg);
|
||||
}
|
||||
|
||||
/*
|
||||
* nsp_get_bit - get one bit (corresponding to the GPIO pin) in a
|
||||
* nsp GPIO register
|
||||
*/
|
||||
static inline bool nsp_get_bit(struct nsp_gpio *chip, enum base_type address,
|
||||
unsigned int reg, unsigned gpio)
|
||||
{
|
||||
if (address == IO_CTRL)
|
||||
return !!(readl(chip->io_ctrl + reg) & BIT(gpio));
|
||||
else
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||||
return !!(readl(chip->base + reg) & BIT(gpio));
|
||||
}
|
||||
|
||||
static irqreturn_t nsp_gpio_irq_handler(int irq, void *data)
|
||||
{
|
||||
struct nsp_gpio *chip = (struct nsp_gpio *)data;
|
||||
struct gpio_chip gc = chip->gc;
|
||||
int bit;
|
||||
unsigned long int_bits = 0;
|
||||
u32 int_status;
|
||||
|
||||
/* go through the entire GPIOs and handle all interrupts */
|
||||
int_status = readl(chip->base + NSP_CHIP_A_INT_STATUS);
|
||||
if (int_status & NSP_CHIP_A_GPIO_INT_BIT) {
|
||||
unsigned int event, level;
|
||||
|
||||
/* Get level and edge interrupts */
|
||||
event = readl(chip->base + NSP_GPIO_EVENT_INT_MASK) &
|
||||
readl(chip->base + NSP_GPIO_EVENT);
|
||||
level = readl(chip->base + NSP_GPIO_DATA_IN) ^
|
||||
readl(chip->base + NSP_GPIO_INT_POLARITY);
|
||||
level &= readl(chip->base + NSP_GPIO_INT_MASK);
|
||||
int_bits = level | event;
|
||||
|
||||
for_each_set_bit(bit, &int_bits, gc.ngpio) {
|
||||
/*
|
||||
* Clear the interrupt before invoking the
|
||||
* handler, so we do not leave any window
|
||||
*/
|
||||
writel(BIT(bit), chip->base + NSP_GPIO_EVENT);
|
||||
generic_handle_irq(
|
||||
irq_linear_revmap(chip->irq_domain, bit));
|
||||
}
|
||||
}
|
||||
|
||||
return int_bits ? IRQ_HANDLED : IRQ_NONE;
|
||||
}
|
||||
|
||||
static void nsp_gpio_irq_ack(struct irq_data *d)
|
||||
{
|
||||
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
|
||||
unsigned gpio = d->hwirq;
|
||||
u32 val = BIT(gpio);
|
||||
u32 trigger_type;
|
||||
|
||||
trigger_type = irq_get_trigger_type(d->irq);
|
||||
if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_EVENT, gpio, val);
|
||||
}
|
||||
|
||||
/*
|
||||
* nsp_gpio_irq_set_mask - mask/unmask a GPIO interrupt
|
||||
*
|
||||
* @d: IRQ chip data
|
||||
* @unmask: mask/unmask GPIO interrupt
|
||||
*/
|
||||
static void nsp_gpio_irq_set_mask(struct irq_data *d, bool unmask)
|
||||
{
|
||||
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
|
||||
unsigned gpio = d->hwirq;
|
||||
u32 trigger_type;
|
||||
|
||||
trigger_type = irq_get_trigger_type(d->irq);
|
||||
if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_MASK, gpio, unmask);
|
||||
else
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_INT_MASK, gpio, unmask);
|
||||
}
|
||||
|
||||
static void nsp_gpio_irq_mask(struct irq_data *d)
|
||||
{
|
||||
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_gpio_irq_set_mask(d, false);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
}
|
||||
|
||||
static void nsp_gpio_irq_unmask(struct irq_data *d)
|
||||
{
|
||||
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_gpio_irq_set_mask(d, true);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
}
|
||||
|
||||
static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type)
|
||||
{
|
||||
struct nsp_gpio *chip = irq_data_get_irq_chip_data(d);
|
||||
unsigned gpio = d->hwirq;
|
||||
bool level_low;
|
||||
bool falling;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
falling = nsp_get_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio);
|
||||
level_low = nsp_get_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio);
|
||||
|
||||
switch (type & IRQ_TYPE_SENSE_MASK) {
|
||||
case IRQ_TYPE_EDGE_RISING:
|
||||
falling = false;
|
||||
break;
|
||||
|
||||
case IRQ_TYPE_EDGE_FALLING:
|
||||
falling = true;
|
||||
break;
|
||||
|
||||
case IRQ_TYPE_LEVEL_HIGH:
|
||||
level_low = false;
|
||||
break;
|
||||
|
||||
case IRQ_TYPE_LEVEL_LOW:
|
||||
level_low = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
|
||||
type);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, falling);
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio, level_low);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio,
|
||||
level_low ? "true" : "false", falling ? "true" : "false");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct irq_chip nsp_gpio_irq_chip = {
|
||||
.name = "gpio-a",
|
||||
.irq_enable = nsp_gpio_irq_unmask,
|
||||
.irq_disable = nsp_gpio_irq_mask,
|
||||
.irq_ack = nsp_gpio_irq_ack,
|
||||
.irq_mask = nsp_gpio_irq_mask,
|
||||
.irq_unmask = nsp_gpio_irq_unmask,
|
||||
.irq_set_type = nsp_gpio_irq_set_type,
|
||||
};
|
||||
|
||||
/*
|
||||
* Request the nsp IOMUX pinmux controller to mux individual pins to GPIO
|
||||
*/
|
||||
static int nsp_gpio_request(struct gpio_chip *gc, unsigned offset)
|
||||
{
|
||||
unsigned gpio = gc->base + offset;
|
||||
|
||||
return pinctrl_request_gpio(gpio);
|
||||
}
|
||||
|
||||
static void nsp_gpio_free(struct gpio_chip *gc, unsigned offset)
|
||||
{
|
||||
unsigned gpio = gc->base + offset;
|
||||
|
||||
pinctrl_free_gpio(gpio);
|
||||
}
|
||||
|
||||
static int nsp_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
|
||||
{
|
||||
struct nsp_gpio *chip = to_nsp_gpio(gc);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, false);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
dev_dbg(chip->dev, "gpio:%u set input\n", gpio);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nsp_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,
|
||||
int val)
|
||||
{
|
||||
struct nsp_gpio *chip = to_nsp_gpio(gc);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true);
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nsp_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)
|
||||
{
|
||||
struct nsp_gpio *chip = to_nsp_gpio(gc);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);
|
||||
}
|
||||
|
||||
static int nsp_gpio_get(struct gpio_chip *gc, unsigned gpio)
|
||||
{
|
||||
struct nsp_gpio *chip = to_nsp_gpio(gc);
|
||||
|
||||
return !!(readl(chip->base + NSP_GPIO_DATA_IN) & BIT(gpio));
|
||||
}
|
||||
|
||||
static int nsp_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
|
||||
{
|
||||
struct nsp_gpio *chip = to_nsp_gpio(gc);
|
||||
|
||||
return irq_linear_revmap(chip->irq_domain, offset);
|
||||
}
|
||||
|
||||
static int nsp_get_groups_count(struct pinctrl_dev *pctldev)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Only one group: "gpio_grp", since this local pinctrl device only performs
|
||||
* GPIO specific PINCONF configurations
|
||||
*/
|
||||
static const char *nsp_get_group_name(struct pinctrl_dev *pctldev,
|
||||
unsigned selector)
|
||||
{
|
||||
return "gpio_grp";
|
||||
}
|
||||
|
||||
static const struct pinctrl_ops nsp_pctrl_ops = {
|
||||
.get_groups_count = nsp_get_groups_count,
|
||||
.get_group_name = nsp_get_group_name,
|
||||
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
|
||||
.dt_free_map = pinctrl_utils_dt_free_map,
|
||||
};
|
||||
|
||||
static int nsp_gpio_set_slew(struct nsp_gpio *chip, unsigned gpio, u16 slew)
|
||||
{
|
||||
if (slew)
|
||||
nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, true);
|
||||
else
|
||||
nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, false);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nsp_gpio_set_pull(struct nsp_gpio *chip, unsigned gpio,
|
||||
bool pull_up, bool pull_down)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
nsp_set_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio, pull_down);
|
||||
nsp_set_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio, pull_up);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
dev_dbg(chip->dev, "gpio:%u set pullup:%d pulldown: %d\n",
|
||||
gpio, pull_up, pull_down);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nsp_gpio_get_pull(struct nsp_gpio *chip, unsigned gpio,
|
||||
bool *pull_up, bool *pull_down)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
*pull_up = nsp_get_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio);
|
||||
*pull_down = nsp_get_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio);
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
}
|
||||
|
||||
static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio,
|
||||
u16 strength)
|
||||
{
|
||||
u32 offset, shift, i;
|
||||
u32 val;
|
||||
unsigned long flags;
|
||||
|
||||
/* make sure drive strength is supported */
|
||||
if (strength < 2 || strength > 16 || (strength % 2))
|
||||
return -ENOTSUPP;
|
||||
|
||||
shift = gpio;
|
||||
offset = NSP_GPIO_DRV_CTRL;
|
||||
dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,
|
||||
strength);
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
strength = (strength / 2) - 1;
|
||||
for (i = GPIO_DRV_STRENGTH_BITS; i > 0; i--) {
|
||||
val = readl(chip->io_ctrl + offset);
|
||||
val &= ~BIT(shift);
|
||||
val |= ((strength >> (i-1)) & 0x1) << shift;
|
||||
writel(val, chip->io_ctrl + offset);
|
||||
offset += 4;
|
||||
}
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio,
|
||||
u16 *strength)
|
||||
{
|
||||
unsigned int i, offset, shift;
|
||||
u32 val;
|
||||
unsigned long flags;
|
||||
|
||||
offset = NSP_GPIO_DRV_CTRL;
|
||||
shift = gpio;
|
||||
|
||||
spin_lock_irqsave(&chip->lock, flags);
|
||||
*strength = 0;
|
||||
for (i = (GPIO_DRV_STRENGTH_BITS - 1); i >= 0; i--) {
|
||||
val = readl(chip->io_ctrl + offset) & BIT(shift);
|
||||
val >>= shift;
|
||||
*strength += (val << i);
|
||||
offset += 4;
|
||||
}
|
||||
|
||||
/* convert to mA */
|
||||
*strength = (*strength + 1) * 2;
|
||||
spin_unlock_irqrestore(&chip->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int nsp_pin_config_group_get(struct pinctrl_dev *pctldev, unsigned selector,
|
||||
unsigned long *config)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
int nsp_pin_config_group_set(struct pinctrl_dev *pctldev, unsigned selector,
|
||||
unsigned long *configs, unsigned num_configs)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nsp_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
|
||||
unsigned long *config)
|
||||
{
|
||||
struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
|
||||
enum pin_config_param param = pinconf_to_config_param(*config);
|
||||
unsigned int gpio;
|
||||
u16 arg = 0;
|
||||
bool pull_up, pull_down;
|
||||
int ret;
|
||||
|
||||
gpio = nsp_pin_to_gpio(pin);
|
||||
switch (param) {
|
||||
case PIN_CONFIG_BIAS_DISABLE:
|
||||
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
|
||||
if ((pull_up == false) && (pull_down == false))
|
||||
return 0;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
case PIN_CONFIG_BIAS_PULL_UP:
|
||||
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
|
||||
if (pull_up)
|
||||
return 0;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
case PIN_CONFIG_BIAS_PULL_DOWN:
|
||||
nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);
|
||||
if (pull_down)
|
||||
return 0;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
case PIN_CONFIG_DRIVE_STRENGTH:
|
||||
ret = nsp_gpio_get_strength(chip, gpio, &arg);
|
||||
if (ret)
|
||||
return ret;
|
||||
*config = pinconf_to_config_packed(param, arg);
|
||||
return 0;
|
||||
|
||||
default:
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
}
|
||||
|
||||
static int nsp_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
|
||||
unsigned long *configs, unsigned num_configs)
|
||||
{
|
||||
struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);
|
||||
enum pin_config_param param;
|
||||
u16 arg;
|
||||
unsigned int i, gpio;
|
||||
int ret = -ENOTSUPP;
|
||||
|
||||
gpio = nsp_pin_to_gpio(pin);
|
||||
for (i = 0; i < num_configs; i++) {
|
||||
param = pinconf_to_config_param(configs[i]);
|
||||
arg = pinconf_to_config_argument(configs[i]);
|
||||
|
||||
switch (param) {
|
||||
case PIN_CONFIG_BIAS_DISABLE:
|
||||
ret = nsp_gpio_set_pull(chip, gpio, false, false);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
break;
|
||||
|
||||
case PIN_CONFIG_BIAS_PULL_UP:
|
||||
ret = nsp_gpio_set_pull(chip, gpio, true, false);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
break;
|
||||
|
||||
case PIN_CONFIG_BIAS_PULL_DOWN:
|
||||
ret = nsp_gpio_set_pull(chip, gpio, false, true);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
break;
|
||||
|
||||
case PIN_CONFIG_DRIVE_STRENGTH:
|
||||
ret = nsp_gpio_set_strength(chip, gpio, arg);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
break;
|
||||
|
||||
case PIN_CONFIG_SLEW_RATE:
|
||||
ret = nsp_gpio_set_slew(chip, gpio, arg);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
break;
|
||||
|
||||
default:
|
||||
dev_err(chip->dev, "invalid configuration\n");
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct pinconf_ops nsp_pconf_ops = {
|
||||
.is_generic = true,
|
||||
.pin_config_get = nsp_pin_config_get,
|
||||
.pin_config_set = nsp_pin_config_set,
|
||||
.pin_config_group_get = nsp_pin_config_group_get,
|
||||
.pin_config_group_set = nsp_pin_config_group_set,
|
||||
};
|
||||
|
||||
/*
|
||||
* NSP GPIO controller supports some PINCONF related configurations such as
|
||||
* pull up, pull down, slew and drive strength, when the pin is configured
|
||||
* to GPIO.
|
||||
*
|
||||
* Here a local pinctrl device is created with simple 1-to-1 pin mapping to the
|
||||
* local GPIO pins
|
||||
*/
|
||||
static int nsp_gpio_register_pinconf(struct nsp_gpio *chip)
|
||||
{
|
||||
struct pinctrl_desc *pctldesc = &chip->pctldesc;
|
||||
struct pinctrl_pin_desc *pins;
|
||||
struct gpio_chip *gc = &chip->gc;
|
||||
int i;
|
||||
|
||||
pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);
|
||||
if (!pins)
|
||||
return -ENOMEM;
|
||||
for (i = 0; i < gc->ngpio; i++) {
|
||||
pins[i].number = i;
|
||||
pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,
|
||||
"gpio-%d", i);
|
||||
if (!pins[i].name)
|
||||
return -ENOMEM;
|
||||
}
|
||||
pctldesc->name = dev_name(chip->dev);
|
||||
pctldesc->pctlops = &nsp_pctrl_ops;
|
||||
pctldesc->pins = pins;
|
||||
pctldesc->npins = gc->ngpio;
|
||||
pctldesc->confops = &nsp_pconf_ops;
|
||||
|
||||
chip->pctl = pinctrl_register(pctldesc, chip->dev, chip);
|
||||
if (IS_ERR(chip->pctl)) {
|
||||
dev_err(chip->dev, "unable to register pinctrl device\n");
|
||||
return PTR_ERR(chip->pctl);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id nsp_gpio_of_match[] = {
|
||||
{.compatible = "brcm,nsp-gpio-a",},
|
||||
{}
|
||||
};
|
||||
|
||||
static int nsp_gpio_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct resource *res;
|
||||
struct nsp_gpio *chip;
|
||||
struct gpio_chip *gc;
|
||||
u32 val, count;
|
||||
int irq, ret;
|
||||
|
||||
if (of_property_read_u32(pdev->dev.of_node, "ngpios", &val)) {
|
||||
dev_err(&pdev->dev, "Missing ngpios OF property\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
|
||||
if (!chip)
|
||||
return -ENOMEM;
|
||||
|
||||
chip->dev = dev;
|
||||
platform_set_drvdata(pdev, chip);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
chip->base = devm_ioremap_resource(dev, res);
|
||||
if (IS_ERR(chip->base)) {
|
||||
dev_err(dev, "unable to map I/O memory\n");
|
||||
return PTR_ERR(chip->base);
|
||||
}
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
chip->io_ctrl = devm_ioremap_resource(dev, res);
|
||||
if (IS_ERR(chip->io_ctrl)) {
|
||||
dev_err(dev, "unable to map I/O memory\n");
|
||||
return PTR_ERR(chip->io_ctrl);
|
||||
}
|
||||
|
||||
spin_lock_init(&chip->lock);
|
||||
gc = &chip->gc;
|
||||
gc->base = -1;
|
||||
gc->can_sleep = false;
|
||||
gc->ngpio = val;
|
||||
gc->label = dev_name(dev);
|
||||
gc->dev = dev;
|
||||
gc->of_node = dev->of_node;
|
||||
gc->request = nsp_gpio_request;
|
||||
gc->free = nsp_gpio_free;
|
||||
gc->direction_input = nsp_gpio_direction_input;
|
||||
gc->direction_output = nsp_gpio_direction_output;
|
||||
gc->set = nsp_gpio_set;
|
||||
gc->get = nsp_gpio_get;
|
||||
gc->to_irq = nsp_gpio_to_irq;
|
||||
|
||||
/* optional GPIO interrupt support */
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (irq > 0) {
|
||||
/* Create irq domain so that each pin can be assigned an IRQ.*/
|
||||
chip->irq_domain = irq_domain_add_linear(gc->of_node, gc->ngpio,
|
||||
&irq_domain_simple_ops,
|
||||
chip);
|
||||
if (!chip->irq_domain) {
|
||||
dev_err(&pdev->dev, "Couldn't allocate IRQ domain\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
/* Map each gpio to an IRQ and set the handler for gpiolib. */
|
||||
for (count = 0; count < gc->ngpio; count++) {
|
||||
int irq = irq_create_mapping(chip->irq_domain, count);
|
||||
|
||||
irq_set_chip_and_handler(irq, &nsp_gpio_irq_chip,
|
||||
handle_simple_irq);
|
||||
set_irq_flags(irq, IRQF_VALID);
|
||||
irq_set_chip_data(irq, chip);
|
||||
}
|
||||
|
||||
/* Install ISR for this GPIO controller. */
|
||||
ret = devm_request_irq(&pdev->dev, irq, nsp_gpio_irq_handler,
|
||||
IRQF_SHARED, "gpio-a", chip);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Unable to request IRQ%d: %d\n",
|
||||
irq, ret);
|
||||
goto err_rm_gpiochip;
|
||||
}
|
||||
|
||||
val = readl(chip->base + NSP_CHIP_A_INT_MASK);
|
||||
val = val | NSP_CHIP_A_GPIO_INT_BIT;
|
||||
writel(val, (chip->base + NSP_CHIP_A_INT_MASK));
|
||||
}
|
||||
|
||||
ret = gpiochip_add(gc);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "unable to add GPIO chip\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = nsp_gpio_register_pinconf(chip);
|
||||
if (ret) {
|
||||
dev_err(dev, "unable to register pinconf\n");
|
||||
goto err_rm_gpiochip;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_rm_gpiochip:
|
||||
gpiochip_remove(gc);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct platform_driver nsp_gpio_driver = {
|
||||
.driver = {
|
||||
.name = "nsp-gpio-a",
|
||||
.of_match_table = nsp_gpio_of_match,
|
||||
},
|
||||
.probe = nsp_gpio_probe,
|
||||
};
|
||||
|
||||
static int __init nsp_gpio_init(void)
|
||||
{
|
||||
return platform_driver_probe(&nsp_gpio_driver, nsp_gpio_probe);
|
||||
}
|
||||
arch_initcall_sync(nsp_gpio_init);
|
||||
Loading…
Reference in New Issue
Block a user