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alistair23-linux/drivers/pinctrl/bcm/pinctrl-bcm2835.c
Linus Torvalds 6aa2f9441f This is the bulk of GPIO changes for the v4.15 kernel cycle: 
CORE:
 - Fix the semantics of raw GPIO to actually be raw. No
   inversion semantics as before, but also no open draining,
   and allow the raw operations to affect lines used for
   interrupts as the caller supposedly knows what they are
   doing if they are getting the big hammer.
 
 - Rewrote the __inner_function() notation calls to names that
   make more sense. I just find this kind of code disturbing.
 
 - Drop the .irq_base() field from the gpiochip since now all
   IRQs are mapped dynamically. This is nice.
 
 - Support for .get_multiple() in the core driver API. This
   allows us to read several GPIO lines with a single
   register read. This has high value for some usecases: it
   can be used to create oscilloscopes and signal analyzers
   and other things that rely on reading several lines at
   exactly the same instant. Also a generally nice
   optimization. This uses the new assign_bit() macro from
   the bitops lib that was ACKed by Andrew Morton and
   is implemented for two drivers, one of them being the
   generic MMIO driver so everyone using that will be able
   to benefit from this.
 
 - Do not allow requests of Open Drain and Open Source
   setting of a GPIO line simultaneously. If the hardware
   actually supports enabling both at the same time the
   electrical result would be disastrous.
 
 - A new interrupt chip core helper. This will be helpful
   to deal with "banked" GPIOs, which means GPIO controllers
   with several logical blocks of GPIO inside them. This
   is several gpiochips per device in the device model, in
   contrast to the case when there is a 1-to-1 relationship
   between a device and a gpiochip.
 
 NEW DRIVERS:
 
 - Maxim MAX3191x industrial serializer, a very interesting
   piece of professional I/O hardware.
 
 - Uniphier GPIO driver. This is the GPIO block from the
   recent Socionext (ex Fujitsu and Panasonic) platform.
 
 - Tegra 186 driver. This is based on the new banked GPIO
   infrastructure.
 
 OTHER IMPROVEMENTS:
 
 - Some documentation improvements.
 
 - Wakeup support for the DesignWare DWAPB GPIO controller.
 
 - Reset line support on the DesignWare DWAPB GPIO controller.
 
 - Several non-critical bug fixes and improvements for the
   Broadcom BRCMSTB driver.
 
 - Misc non-critical bug fixes like exotic errorpaths, removal
   of dead code etc.
 
 - Explicit comments on fall-through switch() statements.
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 =8Mon
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Merge tag 'gpio-v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v4.15 kernel cycle:

  Core:

   - Fix the semantics of raw GPIO to actually be raw. No inversion
     semantics as before, but also no open draining, and allow the raw
     operations to affect lines used for interrupts as the caller
     supposedly knows what they are doing if they are getting the big
     hammer.

   - Rewrote the __inner_function() notation calls to names that make
     more sense. I just find this kind of code disturbing.

   - Drop the .irq_base() field from the gpiochip since now all IRQs are
     mapped dynamically. This is nice.

   - Support for .get_multiple() in the core driver API. This allows us
     to read several GPIO lines with a single register read. This has
     high value for some usecases: it can be used to create
     oscilloscopes and signal analyzers and other things that rely on
     reading several lines at exactly the same instant. Also a generally
     nice optimization. This uses the new assign_bit() macro from the
     bitops lib that was ACKed by Andrew Morton and is implemented for
     two drivers, one of them being the generic MMIO driver so everyone
     using that will be able to benefit from this.

   - Do not allow requests of Open Drain and Open Source setting of a
     GPIO line simultaneously. If the hardware actually supports
     enabling both at the same time the electrical result would be
     disastrous.

   - A new interrupt chip core helper. This will be helpful to deal with
     "banked" GPIOs, which means GPIO controllers with several logical
     blocks of GPIO inside them. This is several gpiochips per device in
     the device model, in contrast to the case when there is a 1-to-1
     relationship between a device and a gpiochip.

  New drivers:

   - Maxim MAX3191x industrial serializer, a very interesting piece of
     professional I/O hardware.

   - Uniphier GPIO driver. This is the GPIO block from the recent
     Socionext (ex Fujitsu and Panasonic) platform.

   - Tegra 186 driver. This is based on the new banked GPIO
     infrastructure.

  Other improvements:

   - Some documentation improvements.

   - Wakeup support for the DesignWare DWAPB GPIO controller.

   - Reset line support on the DesignWare DWAPB GPIO controller.

   - Several non-critical bug fixes and improvements for the Broadcom
     BRCMSTB driver.

   - Misc non-critical bug fixes like exotic errorpaths, removal of dead
     code etc.

   - Explicit comments on fall-through switch() statements"

* tag 'gpio-v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (65 commits)
  gpio: tegra186: Remove tegra186_gpio_lock_class
  gpio: rcar: Add r8a77995 (R-Car D3) support
  pinctrl: bcm2835: Fix some merge fallout
  gpio: Fix undefined lock_dep_class
  gpio: Automatically add lockdep keys
  gpio: Introduce struct gpio_irq_chip.first
  gpio: Disambiguate struct gpio_irq_chip.nested
  gpio: Add Tegra186 support
  gpio: Export gpiochip_irq_{map,unmap}()
  gpio: Implement tighter IRQ chip integration
  gpio: Move lock_key into struct gpio_irq_chip
  gpio: Move irq_valid_mask into struct gpio_irq_chip
  gpio: Move irq_nested into struct gpio_irq_chip
  gpio: Move irq_chained_parent to struct gpio_irq_chip
  gpio: Move irq_default_type to struct gpio_irq_chip
  gpio: Move irq_handler to struct gpio_irq_chip
  gpio: Move irqdomain into struct gpio_irq_chip
  gpio: Move irqchip into struct gpio_irq_chip
  gpio: Introduce struct gpio_irq_chip
  pinctrl: armada-37xx: remove unused variable
  ...
2017-11-14 17:23:44 -08:00

1087 lines
28 KiB
C
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/*
* Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
*
* Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
*
* This driver is inspired by:
* pinctrl-nomadik.c, please see original file for copyright information
* pinctrl-tegra.c, please see original file for copyright information
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitmap.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#define MODULE_NAME "pinctrl-bcm2835"
#define BCM2835_NUM_GPIOS 54
#define BCM2835_NUM_BANKS 2
#define BCM2835_NUM_IRQS 3
#define BCM2835_PIN_BITMAP_SZ \
DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
/* GPIO register offsets */
#define GPFSEL0 0x0 /* Function Select */
#define GPSET0 0x1c /* Pin Output Set */
#define GPCLR0 0x28 /* Pin Output Clear */
#define GPLEV0 0x34 /* Pin Level */
#define GPEDS0 0x40 /* Pin Event Detect Status */
#define GPREN0 0x4c /* Pin Rising Edge Detect Enable */
#define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */
#define GPHEN0 0x64 /* Pin High Detect Enable */
#define GPLEN0 0x70 /* Pin Low Detect Enable */
#define GPAREN0 0x7c /* Pin Async Rising Edge Detect */
#define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */
#define GPPUD 0x94 /* Pin Pull-up/down Enable */
#define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */
#define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4))
#define FSEL_SHIFT(p) (((p) % 10) * 3)
#define GPIO_REG_OFFSET(p) ((p) / 32)
#define GPIO_REG_SHIFT(p) ((p) % 32)
enum bcm2835_pinconf_param {
/* argument: bcm2835_pinconf_pull */
BCM2835_PINCONF_PARAM_PULL,
};
#define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
#define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
#define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
struct bcm2835_pinctrl {
struct device *dev;
void __iomem *base;
int irq[BCM2835_NUM_IRQS];
/* note: locking assumes each bank will have its own unsigned long */
unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
unsigned int irq_type[BCM2835_NUM_GPIOS];
struct pinctrl_dev *pctl_dev;
struct gpio_chip gpio_chip;
struct pinctrl_gpio_range gpio_range;
spinlock_t irq_lock[BCM2835_NUM_BANKS];
};
/* pins are just named GPIO0..GPIO53 */
#define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
BCM2835_GPIO_PIN(0),
BCM2835_GPIO_PIN(1),
BCM2835_GPIO_PIN(2),
BCM2835_GPIO_PIN(3),
BCM2835_GPIO_PIN(4),
BCM2835_GPIO_PIN(5),
BCM2835_GPIO_PIN(6),
BCM2835_GPIO_PIN(7),
BCM2835_GPIO_PIN(8),
BCM2835_GPIO_PIN(9),
BCM2835_GPIO_PIN(10),
BCM2835_GPIO_PIN(11),
BCM2835_GPIO_PIN(12),
BCM2835_GPIO_PIN(13),
BCM2835_GPIO_PIN(14),
BCM2835_GPIO_PIN(15),
BCM2835_GPIO_PIN(16),
BCM2835_GPIO_PIN(17),
BCM2835_GPIO_PIN(18),
BCM2835_GPIO_PIN(19),
BCM2835_GPIO_PIN(20),
BCM2835_GPIO_PIN(21),
BCM2835_GPIO_PIN(22),
BCM2835_GPIO_PIN(23),
BCM2835_GPIO_PIN(24),
BCM2835_GPIO_PIN(25),
BCM2835_GPIO_PIN(26),
BCM2835_GPIO_PIN(27),
BCM2835_GPIO_PIN(28),
BCM2835_GPIO_PIN(29),
BCM2835_GPIO_PIN(30),
BCM2835_GPIO_PIN(31),
BCM2835_GPIO_PIN(32),
BCM2835_GPIO_PIN(33),
BCM2835_GPIO_PIN(34),
BCM2835_GPIO_PIN(35),
BCM2835_GPIO_PIN(36),
BCM2835_GPIO_PIN(37),
BCM2835_GPIO_PIN(38),
BCM2835_GPIO_PIN(39),
BCM2835_GPIO_PIN(40),
BCM2835_GPIO_PIN(41),
BCM2835_GPIO_PIN(42),
BCM2835_GPIO_PIN(43),
BCM2835_GPIO_PIN(44),
BCM2835_GPIO_PIN(45),
BCM2835_GPIO_PIN(46),
BCM2835_GPIO_PIN(47),
BCM2835_GPIO_PIN(48),
BCM2835_GPIO_PIN(49),
BCM2835_GPIO_PIN(50),
BCM2835_GPIO_PIN(51),
BCM2835_GPIO_PIN(52),
BCM2835_GPIO_PIN(53),
};
/* one pin per group */
static const char * const bcm2835_gpio_groups[] = {
"gpio0",
"gpio1",
"gpio2",
"gpio3",
"gpio4",
"gpio5",
"gpio6",
"gpio7",
"gpio8",
"gpio9",
"gpio10",
"gpio11",
"gpio12",
"gpio13",
"gpio14",
"gpio15",
"gpio16",
"gpio17",
"gpio18",
"gpio19",
"gpio20",
"gpio21",
"gpio22",
"gpio23",
"gpio24",
"gpio25",
"gpio26",
"gpio27",
"gpio28",
"gpio29",
"gpio30",
"gpio31",
"gpio32",
"gpio33",
"gpio34",
"gpio35",
"gpio36",
"gpio37",
"gpio38",
"gpio39",
"gpio40",
"gpio41",
"gpio42",
"gpio43",
"gpio44",
"gpio45",
"gpio46",
"gpio47",
"gpio48",
"gpio49",
"gpio50",
"gpio51",
"gpio52",
"gpio53",
};
enum bcm2835_fsel {
BCM2835_FSEL_GPIO_IN = 0,
BCM2835_FSEL_GPIO_OUT = 1,
BCM2835_FSEL_ALT0 = 4,
BCM2835_FSEL_ALT1 = 5,
BCM2835_FSEL_ALT2 = 6,
BCM2835_FSEL_ALT3 = 7,
BCM2835_FSEL_ALT4 = 3,
BCM2835_FSEL_ALT5 = 2,
BCM2835_FSEL_COUNT = 8,
BCM2835_FSEL_MASK = 0x7,
};
static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
[BCM2835_FSEL_GPIO_IN] = "gpio_in",
[BCM2835_FSEL_GPIO_OUT] = "gpio_out",
[BCM2835_FSEL_ALT0] = "alt0",
[BCM2835_FSEL_ALT1] = "alt1",
[BCM2835_FSEL_ALT2] = "alt2",
[BCM2835_FSEL_ALT3] = "alt3",
[BCM2835_FSEL_ALT4] = "alt4",
[BCM2835_FSEL_ALT5] = "alt5",
};
static const char * const irq_type_names[] = {
[IRQ_TYPE_NONE] = "none",
[IRQ_TYPE_EDGE_RISING] = "edge-rising",
[IRQ_TYPE_EDGE_FALLING] = "edge-falling",
[IRQ_TYPE_EDGE_BOTH] = "edge-both",
[IRQ_TYPE_LEVEL_HIGH] = "level-high",
[IRQ_TYPE_LEVEL_LOW] = "level-low",
};
static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
{
return readl(pc->base + reg);
}
static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
u32 val)
{
writel(val, pc->base + reg);
}
static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
unsigned bit)
{
reg += GPIO_REG_OFFSET(bit) * 4;
return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
}
/* note NOT a read/modify/write cycle */
static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
unsigned reg, unsigned bit)
{
reg += GPIO_REG_OFFSET(bit) * 4;
bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
}
static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
struct bcm2835_pinctrl *pc, unsigned pin)
{
u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
bcm2835_functions[status]);
return status;
}
static inline void bcm2835_pinctrl_fsel_set(
struct bcm2835_pinctrl *pc, unsigned pin,
enum bcm2835_fsel fsel)
{
u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
bcm2835_functions[cur]);
if (cur == fsel)
return;
if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
/* always transition through GPIO_IN */
val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
}
val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
val |= fsel << FSEL_SHIFT(pin);
dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
bcm2835_functions[fsel]);
bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
}
static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
}
static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
/* Alternative function doesn't clearly provide a direction */
if (fsel > BCM2835_FSEL_GPIO_OUT)
return -EINVAL;
return (fsel == BCM2835_FSEL_GPIO_IN);
}
static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
}
static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
bcm2835_gpio_set(chip, offset, value);
return pinctrl_gpio_direction_output(chip->base + offset);
}
static const struct gpio_chip bcm2835_gpio_chip = {
.label = MODULE_NAME,
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.direction_input = bcm2835_gpio_direction_input,
.direction_output = bcm2835_gpio_direction_output,
.get_direction = bcm2835_gpio_get_direction,
.get = bcm2835_gpio_get,
.set = bcm2835_gpio_set,
.base = -1,
.ngpio = BCM2835_NUM_GPIOS,
.can_sleep = false,
};
static void bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl *pc,
unsigned int bank, u32 mask)
{
unsigned long events;
unsigned offset;
unsigned gpio;
events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
events &= mask;
events &= pc->enabled_irq_map[bank];
for_each_set_bit(offset, &events, 32) {
gpio = (32 * bank) + offset;
generic_handle_irq(irq_linear_revmap(pc->gpio_chip.irq.domain,
gpio));
}
}
static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
{
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
struct irq_chip *host_chip = irq_desc_get_chip(desc);
int irq = irq_desc_get_irq(desc);
int group;
int i;
for (i = 0; i < ARRAY_SIZE(pc->irq); i++) {
if (pc->irq[i] == irq) {
group = i;
break;
}
}
/* This should not happen, every IRQ has a bank */
if (i == ARRAY_SIZE(pc->irq))
BUG();
chained_irq_enter(host_chip, desc);
switch (group) {
case 0: /* IRQ0 covers GPIOs 0-27 */
bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff);
break;
case 1: /* IRQ1 covers GPIOs 28-45 */
bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000);
bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff);
break;
case 2: /* IRQ2 covers GPIOs 46-53 */
bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000);
break;
}
chained_irq_exit(host_chip, desc);
}
static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
unsigned reg, unsigned offset, bool enable)
{
u32 value;
reg += GPIO_REG_OFFSET(offset) * 4;
value = bcm2835_gpio_rd(pc, reg);
if (enable)
value |= BIT(GPIO_REG_SHIFT(offset));
else
value &= ~(BIT(GPIO_REG_SHIFT(offset)));
bcm2835_gpio_wr(pc, reg, value);
}
/* fast path for IRQ handler */
static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
unsigned offset, bool enable)
{
switch (pc->irq_type[offset]) {
case IRQ_TYPE_EDGE_RISING:
__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
break;
case IRQ_TYPE_EDGE_FALLING:
__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
break;
case IRQ_TYPE_EDGE_BOTH:
__bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
__bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
break;
case IRQ_TYPE_LEVEL_HIGH:
__bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
break;
case IRQ_TYPE_LEVEL_LOW:
__bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
break;
}
}
static void bcm2835_gpio_irq_enable(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
unsigned gpio = irqd_to_hwirq(data);
unsigned offset = GPIO_REG_SHIFT(gpio);
unsigned bank = GPIO_REG_OFFSET(gpio);
unsigned long flags;
spin_lock_irqsave(&pc->irq_lock[bank], flags);
set_bit(offset, &pc->enabled_irq_map[bank]);
bcm2835_gpio_irq_config(pc, gpio, true);
spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
}
static void bcm2835_gpio_irq_disable(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
unsigned gpio = irqd_to_hwirq(data);
unsigned offset = GPIO_REG_SHIFT(gpio);
unsigned bank = GPIO_REG_OFFSET(gpio);
unsigned long flags;
spin_lock_irqsave(&pc->irq_lock[bank], flags);
bcm2835_gpio_irq_config(pc, gpio, false);
/* Clear events that were latched prior to clearing event sources */
bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
clear_bit(offset, &pc->enabled_irq_map[bank]);
spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
}
static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
unsigned offset, unsigned int type)
{
switch (type) {
case IRQ_TYPE_NONE:
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_EDGE_BOTH:
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_LEVEL_LOW:
pc->irq_type[offset] = type;
break;
default:
return -EINVAL;
}
return 0;
}
/* slower path for reconfiguring IRQ type */
static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
unsigned offset, unsigned int type)
{
switch (type) {
case IRQ_TYPE_NONE:
if (pc->irq_type[offset] != type) {
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
}
break;
case IRQ_TYPE_EDGE_RISING:
if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
/* RISING already enabled, disable FALLING */
pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
} else if (pc->irq_type[offset] != type) {
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
bcm2835_gpio_irq_config(pc, offset, true);
}
break;
case IRQ_TYPE_EDGE_FALLING:
if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
/* FALLING already enabled, disable RISING */
pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
} else if (pc->irq_type[offset] != type) {
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
bcm2835_gpio_irq_config(pc, offset, true);
}
break;
case IRQ_TYPE_EDGE_BOTH:
if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
/* RISING already enabled, enable FALLING too */
pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
bcm2835_gpio_irq_config(pc, offset, true);
pc->irq_type[offset] = type;
} else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
/* FALLING already enabled, enable RISING too */
pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
bcm2835_gpio_irq_config(pc, offset, true);
pc->irq_type[offset] = type;
} else if (pc->irq_type[offset] != type) {
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
bcm2835_gpio_irq_config(pc, offset, true);
}
break;
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_LEVEL_LOW:
if (pc->irq_type[offset] != type) {
bcm2835_gpio_irq_config(pc, offset, false);
pc->irq_type[offset] = type;
bcm2835_gpio_irq_config(pc, offset, true);
}
break;
default:
return -EINVAL;
}
return 0;
}
static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
unsigned gpio = irqd_to_hwirq(data);
unsigned offset = GPIO_REG_SHIFT(gpio);
unsigned bank = GPIO_REG_OFFSET(gpio);
unsigned long flags;
int ret;
spin_lock_irqsave(&pc->irq_lock[bank], flags);
if (test_bit(offset, &pc->enabled_irq_map[bank]))
ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
else
ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(data, handle_edge_irq);
else
irq_set_handler_locked(data, handle_level_irq);
spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
return ret;
}
static void bcm2835_gpio_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
unsigned gpio = irqd_to_hwirq(data);
bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
}
static struct irq_chip bcm2835_gpio_irq_chip = {
.name = MODULE_NAME,
.irq_enable = bcm2835_gpio_irq_enable,
.irq_disable = bcm2835_gpio_irq_disable,
.irq_set_type = bcm2835_gpio_irq_set_type,
.irq_ack = bcm2835_gpio_irq_ack,
.irq_mask = bcm2835_gpio_irq_disable,
.irq_unmask = bcm2835_gpio_irq_enable,
};
static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(bcm2835_gpio_groups);
}
static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return bcm2835_gpio_groups[selector];
}
static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
*pins = &bcm2835_gpio_pins[selector].number;
*num_pins = 1;
return 0;
}
static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned offset)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
struct gpio_chip *chip = &pc->gpio_chip;
enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
const char *fname = bcm2835_functions[fsel];
int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
int irq = irq_find_mapping(chip->irq.domain, offset);
seq_printf(s, "function %s in %s; irq %d (%s)",
fname, value ? "hi" : "lo",
irq, irq_type_names[pc->irq_type[offset]]);
}
static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *maps, unsigned num_maps)
{
int i;
for (i = 0; i < num_maps; i++)
if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
kfree(maps[i].data.configs.configs);
kfree(maps);
}
static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
struct device_node *np, u32 pin, u32 fnum,
struct pinctrl_map **maps)
{
struct pinctrl_map *map = *maps;
if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
dev_err(pc->dev, "%pOF: invalid brcm,function %d\n", np, fnum);
return -EINVAL;
}
map->type = PIN_MAP_TYPE_MUX_GROUP;
map->data.mux.group = bcm2835_gpio_groups[pin];
map->data.mux.function = bcm2835_functions[fnum];
(*maps)++;
return 0;
}
static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
struct device_node *np, u32 pin, u32 pull,
struct pinctrl_map **maps)
{
struct pinctrl_map *map = *maps;
unsigned long *configs;
if (pull > 2) {
dev_err(pc->dev, "%pOF: invalid brcm,pull %d\n", np, pull);
return -EINVAL;
}
configs = kzalloc(sizeof(*configs), GFP_KERNEL);
if (!configs)
return -ENOMEM;
configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
map->type = PIN_MAP_TYPE_CONFIGS_PIN;
map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
map->data.configs.configs = configs;
map->data.configs.num_configs = 1;
(*maps)++;
return 0;
}
static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map, unsigned *num_maps)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
struct property *pins, *funcs, *pulls;
int num_pins, num_funcs, num_pulls, maps_per_pin;
struct pinctrl_map *maps, *cur_map;
int i, err;
u32 pin, func, pull;
pins = of_find_property(np, "brcm,pins", NULL);
if (!pins) {
dev_err(pc->dev, "%pOF: missing brcm,pins property\n", np);
return -EINVAL;
}
funcs = of_find_property(np, "brcm,function", NULL);
pulls = of_find_property(np, "brcm,pull", NULL);
if (!funcs && !pulls) {
dev_err(pc->dev,
"%pOF: neither brcm,function nor brcm,pull specified\n",
np);
return -EINVAL;
}
num_pins = pins->length / 4;
num_funcs = funcs ? (funcs->length / 4) : 0;
num_pulls = pulls ? (pulls->length / 4) : 0;
if (num_funcs > 1 && num_funcs != num_pins) {
dev_err(pc->dev,
"%pOF: brcm,function must have 1 or %d entries\n",
np, num_pins);
return -EINVAL;
}
if (num_pulls > 1 && num_pulls != num_pins) {
dev_err(pc->dev,
"%pOF: brcm,pull must have 1 or %d entries\n",
np, num_pins);
return -EINVAL;
}
maps_per_pin = 0;
if (num_funcs)
maps_per_pin++;
if (num_pulls)
maps_per_pin++;
cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
GFP_KERNEL);
if (!maps)
return -ENOMEM;
for (i = 0; i < num_pins; i++) {
err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
if (err)
goto out;
if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
dev_err(pc->dev, "%pOF: invalid brcm,pins value %d\n",
np, pin);
err = -EINVAL;
goto out;
}
if (num_funcs) {
err = of_property_read_u32_index(np, "brcm,function",
(num_funcs > 1) ? i : 0, &func);
if (err)
goto out;
err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
func, &cur_map);
if (err)
goto out;
}
if (num_pulls) {
err = of_property_read_u32_index(np, "brcm,pull",
(num_pulls > 1) ? i : 0, &pull);
if (err)
goto out;
err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
pull, &cur_map);
if (err)
goto out;
}
}
*map = maps;
*num_maps = num_pins * maps_per_pin;
return 0;
out:
bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
return err;
}
static const struct pinctrl_ops bcm2835_pctl_ops = {
.get_groups_count = bcm2835_pctl_get_groups_count,
.get_group_name = bcm2835_pctl_get_group_name,
.get_group_pins = bcm2835_pctl_get_group_pins,
.pin_dbg_show = bcm2835_pctl_pin_dbg_show,
.dt_node_to_map = bcm2835_pctl_dt_node_to_map,
.dt_free_map = bcm2835_pctl_dt_free_map,
};
static int bcm2835_pmx_free(struct pinctrl_dev *pctldev,
unsigned offset)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
/* disable by setting to GPIO_IN */
bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
return 0;
}
static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
{
return BCM2835_FSEL_COUNT;
}
static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return bcm2835_functions[selector];
}
static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
/* every pin can do every function */
*groups = bcm2835_gpio_groups;
*num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
return 0;
}
static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
unsigned func_selector,
unsigned group_selector)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
return 0;
}
static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
/* disable by setting to GPIO_IN */
bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
}
static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset,
bool input)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
enum bcm2835_fsel fsel = input ?
BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
bcm2835_pinctrl_fsel_set(pc, offset, fsel);
return 0;
}
static const struct pinmux_ops bcm2835_pmx_ops = {
.free = bcm2835_pmx_free,
.get_functions_count = bcm2835_pmx_get_functions_count,
.get_function_name = bcm2835_pmx_get_function_name,
.get_function_groups = bcm2835_pmx_get_function_groups,
.set_mux = bcm2835_pmx_set,
.gpio_disable_free = bcm2835_pmx_gpio_disable_free,
.gpio_set_direction = bcm2835_pmx_gpio_set_direction,
};
static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *config)
{
/* No way to read back config in HW */
return -ENOTSUPP;
}
static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin, unsigned long *configs,
unsigned num_configs)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
enum bcm2835_pinconf_param param;
u16 arg;
u32 off, bit;
int i;
for (i = 0; i < num_configs; i++) {
param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
if (param != BCM2835_PINCONF_PARAM_PULL)
return -EINVAL;
off = GPIO_REG_OFFSET(pin);
bit = GPIO_REG_SHIFT(pin);
bcm2835_gpio_wr(pc, GPPUD, arg & 3);
/*
* BCM2835 datasheet say to wait 150 cycles, but not of what.
* But the VideoCore firmware delay for this operation
* based nearly on the same amount of VPU cycles and this clock
* runs at 250 MHz.
*/
udelay(1);
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
udelay(1);
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
} /* for each config */
return 0;
}
static const struct pinconf_ops bcm2835_pinconf_ops = {
.pin_config_get = bcm2835_pinconf_get,
.pin_config_set = bcm2835_pinconf_set,
};
static struct pinctrl_desc bcm2835_pinctrl_desc = {
.name = MODULE_NAME,
.pins = bcm2835_gpio_pins,
.npins = ARRAY_SIZE(bcm2835_gpio_pins),
.pctlops = &bcm2835_pctl_ops,
.pmxops = &bcm2835_pmx_ops,
.confops = &bcm2835_pinconf_ops,
.owner = THIS_MODULE,
};
static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
.name = MODULE_NAME,
.npins = BCM2835_NUM_GPIOS,
};
static int bcm2835_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct bcm2835_pinctrl *pc;
struct resource iomem;
int err, i;
BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
if (!pc)
return -ENOMEM;
platform_set_drvdata(pdev, pc);
pc->dev = dev;
err = of_address_to_resource(np, 0, &iomem);
if (err) {
dev_err(dev, "could not get IO memory\n");
return err;
}
pc->base = devm_ioremap_resource(dev, &iomem);
if (IS_ERR(pc->base))
return PTR_ERR(pc->base);
pc->gpio_chip = bcm2835_gpio_chip;
pc->gpio_chip.parent = dev;
pc->gpio_chip.of_node = np;
for (i = 0; i < BCM2835_NUM_BANKS; i++) {
unsigned long events;
unsigned offset;
/* clear event detection flags */
bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
/* clear all the events */
events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
for_each_set_bit(offset, &events, 32)
bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
spin_lock_init(&pc->irq_lock[i]);
}
err = gpiochip_add_data(&pc->gpio_chip, pc);
if (err) {
dev_err(dev, "could not add GPIO chip\n");
return err;
}
err = gpiochip_irqchip_add(&pc->gpio_chip, &bcm2835_gpio_irq_chip,
0, handle_level_irq, IRQ_TYPE_NONE);
if (err) {
dev_info(dev, "could not add irqchip\n");
return err;
}
for (i = 0; i < BCM2835_NUM_IRQS; i++) {
pc->irq[i] = irq_of_parse_and_map(np, i);
if (pc->irq[i] == 0)
continue;
/*
* Use the same handler for all groups: this is necessary
* since we use one gpiochip to cover all lines - the
* irq handler then needs to figure out which group and
* bank that was firing the IRQ and look up the per-group
* and bank data.
*/
gpiochip_set_chained_irqchip(&pc->gpio_chip,
&bcm2835_gpio_irq_chip,
pc->irq[i],
bcm2835_gpio_irq_handler);
}
pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc);
if (IS_ERR(pc->pctl_dev)) {
gpiochip_remove(&pc->gpio_chip);
return PTR_ERR(pc->pctl_dev);
}
pc->gpio_range = bcm2835_pinctrl_gpio_range;
pc->gpio_range.base = pc->gpio_chip.base;
pc->gpio_range.gc = &pc->gpio_chip;
pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
return 0;
}
static const struct of_device_id bcm2835_pinctrl_match[] = {
{ .compatible = "brcm,bcm2835-gpio" },
{}
};
static struct platform_driver bcm2835_pinctrl_driver = {
.probe = bcm2835_pinctrl_probe,
.driver = {
.name = MODULE_NAME,
.of_match_table = bcm2835_pinctrl_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(bcm2835_pinctrl_driver);
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