linux/drivers/pinctrl/pinctrl-at91-pio4.c
Alexis Lothoré 14694179e5 pinctrl: at91-pio4: use dedicated lock class for IRQ
Trying to suspend to RAM on SAMA5D27 EVK leads to the following lockdep
warning:

 ============================================
 WARNING: possible recursive locking detected
 6.7.0-rc5-wt+ #532 Not tainted
 --------------------------------------------
 sh/92 is trying to acquire lock:
 c3cf306c (&irq_desc_lock_class){-.-.}-{2:2}, at: __irq_get_desc_lock+0xe8/0x100

 but task is already holding lock:
 c3d7c46c (&irq_desc_lock_class){-.-.}-{2:2}, at: __irq_get_desc_lock+0xe8/0x100

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(&irq_desc_lock_class);
   lock(&irq_desc_lock_class);

  *** DEADLOCK ***

  May be due to missing lock nesting notation

 6 locks held by sh/92:
  #0: c3aa0258 (sb_writers#6){.+.+}-{0:0}, at: ksys_write+0xd8/0x178
  #1: c4c2df44 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x138/0x284
  #2: c32684a0 (kn->active){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x148/0x284
  #3: c232b6d4 (system_transition_mutex){+.+.}-{3:3}, at: pm_suspend+0x13c/0x4e8
  #4: c387b088 (&dev->mutex){....}-{3:3}, at: __device_suspend+0x1e8/0x91c
  #5: c3d7c46c (&irq_desc_lock_class){-.-.}-{2:2}, at: __irq_get_desc_lock+0xe8/0x100

 stack backtrace:
 CPU: 0 PID: 92 Comm: sh Not tainted 6.7.0-rc5-wt+ #532
 Hardware name: Atmel SAMA5
  unwind_backtrace from show_stack+0x18/0x1c
  show_stack from dump_stack_lvl+0x34/0x48
  dump_stack_lvl from __lock_acquire+0x19ec/0x3a0c
  __lock_acquire from lock_acquire.part.0+0x124/0x2d0
  lock_acquire.part.0 from _raw_spin_lock_irqsave+0x5c/0x78
  _raw_spin_lock_irqsave from __irq_get_desc_lock+0xe8/0x100
  __irq_get_desc_lock from irq_set_irq_wake+0xa8/0x204
  irq_set_irq_wake from atmel_gpio_irq_set_wake+0x58/0xb4
  atmel_gpio_irq_set_wake from irq_set_irq_wake+0x100/0x204
  irq_set_irq_wake from gpio_keys_suspend+0xec/0x2b8
  gpio_keys_suspend from dpm_run_callback+0xe4/0x248
  dpm_run_callback from __device_suspend+0x234/0x91c
  __device_suspend from dpm_suspend+0x224/0x43c
  dpm_suspend from dpm_suspend_start+0x9c/0xa8
  dpm_suspend_start from suspend_devices_and_enter+0x1e0/0xa84
  suspend_devices_and_enter from pm_suspend+0x460/0x4e8
  pm_suspend from state_store+0x78/0xe4
  state_store from kernfs_fop_write_iter+0x1a0/0x284
  kernfs_fop_write_iter from vfs_write+0x38c/0x6f4
  vfs_write from ksys_write+0xd8/0x178
  ksys_write from ret_fast_syscall+0x0/0x1c
 Exception stack(0xc52b3fa8 to 0xc52b3ff0)
 3fa0:                   00000004 005a0ae8 00000001 005a0ae8 00000004 00000001
 3fc0: 00000004 005a0ae8 00000001 00000004 00000004 b6c616c0 00000020 0059d190
 3fe0: 00000004 b6c61678 aec5a041 aebf1a26

This warning is raised because pinctrl-at91-pio4 uses chained IRQ. Whenever
a wake up source configures an IRQ through irq_set_irq_wake, it will
lock the corresponding IRQ desc, and then call irq_set_irq_wake on "parent"
IRQ which will do the same on its own IRQ desc, but since those two locks
share the same class, lockdep reports this as an issue.

Fix lockdep false positive by setting a different class for parent and
children IRQ

Fixes: 776180848b ("pinctrl: introduce driver for Atmel PIO4 controller")
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20231215-lockdep_warning-v1-1-8137b2510ed5@bootlin.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2023-12-21 09:05:02 +01:00

1275 lines
36 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Atmel PIO4 controller
*
* Copyright (C) 2015 Atmel,
* 2015 Ludovic Desroches <ludovic.desroches@atmel.com>
*/
#include <dt-bindings/pinctrl/at91.h>
#include <linux/clk.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
/*
* Warning:
* In order to not introduce confusion between Atmel PIO groups and pinctrl
* framework groups, Atmel PIO groups will be called banks, line is kept to
* designed the pin id into this bank.
*/
#define ATMEL_PIO_MSKR 0x0000
#define ATMEL_PIO_CFGR 0x0004
#define ATMEL_PIO_CFGR_FUNC_MASK GENMASK(2, 0)
#define ATMEL_PIO_DIR_MASK BIT(8)
#define ATMEL_PIO_PUEN_MASK BIT(9)
#define ATMEL_PIO_PDEN_MASK BIT(10)
#define ATMEL_PIO_SR_MASK BIT(11)
#define ATMEL_PIO_IFEN_MASK BIT(12)
#define ATMEL_PIO_IFSCEN_MASK BIT(13)
#define ATMEL_PIO_OPD_MASK BIT(14)
#define ATMEL_PIO_SCHMITT_MASK BIT(15)
#define ATMEL_PIO_DRVSTR_MASK GENMASK(17, 16)
#define ATMEL_PIO_DRVSTR_OFFSET 16
#define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24)
#define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24)
#define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24)
#define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24)
#define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24)
#define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24)
#define ATMEL_PIO_PDSR 0x0008
#define ATMEL_PIO_LOCKSR 0x000C
#define ATMEL_PIO_SODR 0x0010
#define ATMEL_PIO_CODR 0x0014
#define ATMEL_PIO_ODSR 0x0018
#define ATMEL_PIO_IER 0x0020
#define ATMEL_PIO_IDR 0x0024
#define ATMEL_PIO_IMR 0x0028
#define ATMEL_PIO_ISR 0x002C
#define ATMEL_PIO_IOFR 0x003C
#define ATMEL_PIO_NPINS_PER_BANK 32
#define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK)
#define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK)
#define ATMEL_PIO_BANK_OFFSET 0x40
#define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff)
#define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf)
#define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf)
/* Custom pinconf parameters */
#define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1)
/**
* struct atmel_pioctrl_data - Atmel PIO controller (pinmux + gpio) data struct
* @nbanks: number of PIO banks
* @last_bank_count: number of lines in the last bank (can be less than
* the rest of the banks).
* @slew_rate_support: slew rate support
*/
struct atmel_pioctrl_data {
unsigned int nbanks;
unsigned int last_bank_count;
unsigned int slew_rate_support;
};
struct atmel_group {
const char *name;
u32 pin;
};
struct atmel_pin {
unsigned int pin_id;
unsigned int mux;
unsigned int ioset;
unsigned int bank;
unsigned int line;
const char *device;
};
/**
* struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
* @reg_base: base address of the controller.
* @clk: clock of the controller.
* @nbanks: number of PIO groups, it can vary depending on the SoC.
* @pinctrl_dev: pinctrl device registered.
* @groups: groups table to provide group name and pin in the group to pinctrl.
* @group_names: group names table to provide all the group/pin names to
* pinctrl or gpio.
* @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
* fields are set at probe time. Other ones are set when parsing dt
* pinctrl.
* @npins: number of pins.
* @gpio_chip: gpio chip registered.
* @irq_domain: irq domain for the gpio controller.
* @irqs: table containing the hw irq number of the bank. The index of the
* table is the bank id.
* @pm_wakeup_sources: bitmap of wakeup sources (lines)
* @pm_suspend_backup: backup/restore register values on suspend/resume
* @dev: device entry for the Atmel PIO controller.
* @node: node of the Atmel PIO controller.
* @slew_rate_support: slew rate support
*/
struct atmel_pioctrl {
void __iomem *reg_base;
struct clk *clk;
unsigned int nbanks;
struct pinctrl_dev *pinctrl_dev;
struct atmel_group *groups;
const char * const *group_names;
struct atmel_pin **pins;
unsigned int npins;
struct gpio_chip *gpio_chip;
struct irq_domain *irq_domain;
int *irqs;
unsigned int *pm_wakeup_sources;
struct {
u32 imr;
u32 odsr;
u32 cfgr[ATMEL_PIO_NPINS_PER_BANK];
} *pm_suspend_backup;
struct device *dev;
struct device_node *node;
unsigned int slew_rate_support;
};
static const char * const atmel_functions[] = {
"GPIO", "A", "B", "C", "D", "E", "F", "G"
};
static const struct pinconf_generic_params atmel_custom_bindings[] = {
{"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
};
/* --- GPIO --- */
static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
unsigned int bank, unsigned int reg)
{
return readl_relaxed(atmel_pioctrl->reg_base
+ ATMEL_PIO_BANK_OFFSET * bank + reg);
}
static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
unsigned int bank, unsigned int reg,
unsigned int val)
{
writel_relaxed(val, atmel_pioctrl->reg_base
+ ATMEL_PIO_BANK_OFFSET * bank + reg);
}
static void atmel_gpio_irq_ack(struct irq_data *d)
{
/*
* Nothing to do, interrupt is cleared when reading the status
* register.
*/
}
static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
unsigned int reg;
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
BIT(pin->line));
reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
irq_set_handler_locked(d, handle_edge_irq);
reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
irq_set_handler_locked(d, handle_edge_irq);
reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
irq_set_handler_locked(d, handle_edge_irq);
reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
break;
case IRQ_TYPE_LEVEL_LOW:
irq_set_handler_locked(d, handle_level_irq);
reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
break;
case IRQ_TYPE_LEVEL_HIGH:
irq_set_handler_locked(d, handle_level_irq);
reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
break;
case IRQ_TYPE_NONE:
default:
return -EINVAL;
}
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
return 0;
}
static void atmel_gpio_irq_mask(struct irq_data *d)
{
struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
BIT(pin->line));
}
static void atmel_gpio_irq_unmask(struct irq_data *d)
{
struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
BIT(pin->line));
}
static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
{
struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
int bank = ATMEL_PIO_BANK(d->hwirq);
int line = ATMEL_PIO_LINE(d->hwirq);
/* The gpio controller has one interrupt line per bank. */
irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
if (on)
atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
else
atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
return 0;
}
static struct irq_chip atmel_gpio_irq_chip = {
.name = "GPIO",
.irq_ack = atmel_gpio_irq_ack,
.irq_mask = atmel_gpio_irq_mask,
.irq_unmask = atmel_gpio_irq_unmask,
.irq_set_type = atmel_gpio_irq_set_type,
.irq_set_wake = pm_sleep_ptr(atmel_gpio_irq_set_wake),
};
static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
}
static void atmel_gpio_irq_handler(struct irq_desc *desc)
{
unsigned int irq = irq_desc_get_irq(desc);
struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned long isr;
int n, bank = -1;
/* Find from which bank is the irq received. */
for (n = 0; n < atmel_pioctrl->nbanks; n++) {
if (atmel_pioctrl->irqs[n] == irq) {
bank = n;
break;
}
}
if (bank < 0) {
dev_err(atmel_pioctrl->dev,
"no bank associated to irq %u\n", irq);
return;
}
chained_irq_enter(chip, desc);
for (;;) {
isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
ATMEL_PIO_ISR);
isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
ATMEL_PIO_IMR);
if (!isr)
break;
for_each_set_bit(n, &isr, BITS_PER_LONG)
generic_handle_irq(atmel_gpio_to_irq(
atmel_pioctrl->gpio_chip,
bank * ATMEL_PIO_NPINS_PER_BANK + n));
}
chained_irq_exit(chip, desc);
}
static int atmel_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned int reg;
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
BIT(pin->line));
reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
reg &= ~ATMEL_PIO_DIR_MASK;
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
return 0;
}
static int atmel_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned int reg;
reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
return !!(reg & BIT(pin->line));
}
static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
unsigned int bank;
bitmap_zero(bits, atmel_pioctrl->npins);
for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
unsigned int word = bank;
unsigned int offset = 0;
unsigned int reg;
#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
#endif
if (!mask[word])
continue;
reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR);
bits[word] |= mask[word] & (reg << offset);
}
return 0;
}
static int atmel_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset,
int value)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned int reg;
atmel_gpio_write(atmel_pioctrl, pin->bank,
value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
BIT(pin->line));
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
BIT(pin->line));
reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
reg |= ATMEL_PIO_DIR_MASK;
atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
return 0;
}
static void atmel_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
atmel_gpio_write(atmel_pioctrl, pin->bank,
val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
BIT(pin->line));
}
static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
unsigned int bank;
for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
unsigned int bitmask;
unsigned int word = bank;
/*
* On a 64-bit platform, BITS_PER_LONG is 64 so it is necessary to iterate over
* two 32bit words to handle the whole bitmask
*/
#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
#endif
if (!mask[word])
continue;
bitmask = mask[word] & bits[word];
atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask);
bitmask = mask[word] & ~bits[word];
atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask);
#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
mask[word] >>= ATMEL_PIO_NPINS_PER_BANK;
bits[word] >>= ATMEL_PIO_NPINS_PER_BANK;
#endif
}
}
static struct gpio_chip atmel_gpio_chip = {
.direction_input = atmel_gpio_direction_input,
.get = atmel_gpio_get,
.get_multiple = atmel_gpio_get_multiple,
.direction_output = atmel_gpio_direction_output,
.set = atmel_gpio_set,
.set_multiple = atmel_gpio_set_multiple,
.to_irq = atmel_gpio_to_irq,
.base = 0,
};
/* --- PINCTRL --- */
static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
unsigned int pin_id)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
unsigned int line = atmel_pioctrl->pins[pin_id]->line;
void __iomem *addr = atmel_pioctrl->reg_base
+ bank * ATMEL_PIO_BANK_OFFSET;
writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
/* Have to set MSKR first, to access the right pin CFGR. */
wmb();
return readl_relaxed(addr + ATMEL_PIO_CFGR);
}
static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
unsigned int pin_id, u32 conf)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
unsigned int line = atmel_pioctrl->pins[pin_id]->line;
void __iomem *addr = atmel_pioctrl->reg_base
+ bank * ATMEL_PIO_BANK_OFFSET;
writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
/* Have to set MSKR first, to access the right pin CFGR. */
wmb();
writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
}
static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
return atmel_pioctrl->npins;
}
static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
return atmel_pioctrl->groups[selector].name;
}
static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
*pins = (unsigned int *)&atmel_pioctrl->groups[selector].pin;
*num_pins = 1;
return 0;
}
static struct atmel_group *
atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned int pin)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
int i;
for (i = 0; i < atmel_pioctrl->npins; i++) {
struct atmel_group *grp = atmel_pioctrl->groups + i;
if (grp->pin == pin)
return grp;
}
return NULL;
}
static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
struct device_node *np,
u32 pinfunc, const char **grp_name,
const char **func_name)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned int pin_id, func_id;
struct atmel_group *grp;
pin_id = ATMEL_GET_PIN_NO(pinfunc);
func_id = ATMEL_GET_PIN_FUNC(pinfunc);
if (func_id >= ARRAY_SIZE(atmel_functions))
return -EINVAL;
*func_name = atmel_functions[func_id];
grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
if (!grp)
return -EINVAL;
*grp_name = grp->name;
atmel_pioctrl->pins[pin_id]->mux = func_id;
atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
/* Want the device name not the group one. */
if (np->parent == atmel_pioctrl->node)
atmel_pioctrl->pins[pin_id]->device = np->name;
else
atmel_pioctrl->pins[pin_id]->device = np->parent->name;
return 0;
}
static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map,
unsigned int *reserved_maps,
unsigned int *num_maps)
{
unsigned int num_pins, num_configs, reserve;
unsigned long *configs;
struct property *pins;
u32 pinfunc;
int ret, i;
pins = of_find_property(np, "pinmux", NULL);
if (!pins)
return -EINVAL;
ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
&num_configs);
if (ret < 0) {
dev_err(pctldev->dev, "%pOF: could not parse node property\n",
np);
return ret;
}
num_pins = pins->length / sizeof(u32);
if (!num_pins) {
dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
ret = -EINVAL;
goto exit;
}
/*
* Reserve maps, at least there is a mux map and an optional conf
* map for each pin.
*/
reserve = 1;
if (num_configs)
reserve++;
reserve *= num_pins;
ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
reserve);
if (ret < 0)
goto exit;
for (i = 0; i < num_pins; i++) {
const char *group, *func;
ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
if (ret)
goto exit;
ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
&func);
if (ret)
goto exit;
pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
group, func);
if (num_configs) {
ret = pinctrl_utils_add_map_configs(pctldev, map,
reserved_maps, num_maps, group,
configs, num_configs,
PIN_MAP_TYPE_CONFIGS_GROUP);
if (ret < 0)
goto exit;
}
}
exit:
kfree(configs);
return ret;
}
static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned int *num_maps)
{
struct device_node *np;
unsigned int reserved_maps;
int ret;
*map = NULL;
*num_maps = 0;
reserved_maps = 0;
/*
* If all the pins of a device have the same configuration (or no one),
* it is useless to add a subnode, so directly parse node referenced by
* phandle.
*/
ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
&reserved_maps, num_maps);
if (ret) {
for_each_child_of_node(np_config, np) {
ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
&reserved_maps, num_maps);
if (ret < 0) {
of_node_put(np);
break;
}
}
}
if (ret < 0) {
pinctrl_utils_free_map(pctldev, *map, *num_maps);
dev_err(pctldev->dev, "can't create maps for node %pOF\n",
np_config);
}
return ret;
}
static const struct pinctrl_ops atmel_pctlops = {
.get_groups_count = atmel_pctl_get_groups_count,
.get_group_name = atmel_pctl_get_group_name,
.get_group_pins = atmel_pctl_get_group_pins,
.dt_node_to_map = atmel_pctl_dt_node_to_map,
.dt_free_map = pinctrl_utils_free_map,
};
static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(atmel_functions);
}
static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
return atmel_functions[selector];
}
static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
unsigned int selector,
const char * const **groups,
unsigned * const num_groups)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
*groups = atmel_pioctrl->group_names;
*num_groups = atmel_pioctrl->npins;
return 0;
}
static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned int function,
unsigned int group)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned int pin;
u32 conf;
dev_dbg(pctldev->dev, "enable function %s group %s\n",
atmel_functions[function], atmel_pioctrl->groups[group].name);
pin = atmel_pioctrl->groups[group].pin;
conf = atmel_pin_config_read(pctldev, pin);
conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
atmel_pin_config_write(pctldev, pin, conf);
return 0;
}
static const struct pinmux_ops atmel_pmxops = {
.get_functions_count = atmel_pmx_get_functions_count,
.get_function_name = atmel_pmx_get_function_name,
.get_function_groups = atmel_pmx_get_function_groups,
.set_mux = atmel_pmx_set_mux,
};
static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
unsigned int group,
unsigned long *config)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned int param = pinconf_to_config_param(*config), arg = 0;
struct atmel_group *grp = atmel_pioctrl->groups + group;
unsigned int pin_id = grp->pin;
u32 res;
res = atmel_pin_config_read(pctldev, pin_id);
switch (param) {
case PIN_CONFIG_BIAS_PULL_UP:
if (!(res & ATMEL_PIO_PUEN_MASK))
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if ((res & ATMEL_PIO_PUEN_MASK) ||
(!(res & ATMEL_PIO_PDEN_MASK)))
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_DISABLE:
if ((res & ATMEL_PIO_PUEN_MASK) ||
((res & ATMEL_PIO_PDEN_MASK)))
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (!(res & ATMEL_PIO_OPD_MASK))
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
if (res & ATMEL_PIO_OPD_MASK)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (!(res & ATMEL_PIO_SCHMITT_MASK))
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_SLEW_RATE:
if (!atmel_pioctrl->slew_rate_support)
return -EOPNOTSUPP;
if (!(res & ATMEL_PIO_SR_MASK))
return -EINVAL;
arg = 1;
break;
case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
if (!(res & ATMEL_PIO_DRVSTR_MASK))
return -EINVAL;
arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
break;
case PIN_CONFIG_PERSIST_STATE:
return -ENOTSUPP;
default:
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
unsigned int group,
unsigned long *configs,
unsigned int num_configs)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
struct atmel_group *grp = atmel_pioctrl->groups + group;
unsigned int bank, pin, pin_id = grp->pin;
u32 mask, conf = 0;
int i;
conf = atmel_pin_config_read(pctldev, pin_id);
/* Keep slew rate enabled by default. */
if (atmel_pioctrl->slew_rate_support)
conf |= ATMEL_PIO_SR_MASK;
for (i = 0; i < num_configs; i++) {
unsigned int param = pinconf_to_config_param(configs[i]);
unsigned int arg = pinconf_to_config_argument(configs[i]);
dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
__func__, pin_id, configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
conf &= (~ATMEL_PIO_PUEN_MASK);
conf &= (~ATMEL_PIO_PDEN_MASK);
break;
case PIN_CONFIG_BIAS_PULL_UP:
conf |= ATMEL_PIO_PUEN_MASK;
conf &= (~ATMEL_PIO_PDEN_MASK);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
conf |= ATMEL_PIO_PDEN_MASK;
conf &= (~ATMEL_PIO_PUEN_MASK);
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
conf |= ATMEL_PIO_OPD_MASK;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
conf &= ~ATMEL_PIO_OPD_MASK;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (arg == 0)
conf |= ATMEL_PIO_SCHMITT_MASK;
else
conf &= (~ATMEL_PIO_SCHMITT_MASK);
break;
case PIN_CONFIG_INPUT_DEBOUNCE:
if (arg == 0) {
conf &= (~ATMEL_PIO_IFEN_MASK);
conf &= (~ATMEL_PIO_IFSCEN_MASK);
} else {
/*
* We don't care about the debounce value for several reasons:
* - can't have different debounce periods inside a same group,
* - the register to configure this period is a secure register.
* The debouncing filter can filter a pulse with a duration of less
* than 1/2 slow clock period.
*/
conf |= ATMEL_PIO_IFEN_MASK;
conf |= ATMEL_PIO_IFSCEN_MASK;
}
break;
case PIN_CONFIG_OUTPUT:
conf |= ATMEL_PIO_DIR_MASK;
bank = ATMEL_PIO_BANK(pin_id);
pin = ATMEL_PIO_LINE(pin_id);
mask = 1 << pin;
if (arg == 0) {
writel_relaxed(mask, atmel_pioctrl->reg_base +
bank * ATMEL_PIO_BANK_OFFSET +
ATMEL_PIO_CODR);
} else {
writel_relaxed(mask, atmel_pioctrl->reg_base +
bank * ATMEL_PIO_BANK_OFFSET +
ATMEL_PIO_SODR);
}
break;
case PIN_CONFIG_SLEW_RATE:
if (!atmel_pioctrl->slew_rate_support)
break;
/* And remove it if explicitly requested. */
if (arg == 0)
conf &= ~ATMEL_PIO_SR_MASK;
break;
case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
switch (arg) {
case ATMEL_PIO_DRVSTR_LO:
case ATMEL_PIO_DRVSTR_ME:
case ATMEL_PIO_DRVSTR_HI:
conf &= (~ATMEL_PIO_DRVSTR_MASK);
conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
break;
default:
dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
}
break;
case PIN_CONFIG_PERSIST_STATE:
return -ENOTSUPP;
default:
dev_warn(pctldev->dev,
"unsupported configuration parameter: %u\n",
param);
continue;
}
}
dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
atmel_pin_config_write(pctldev, pin_id, conf);
return 0;
}
static int atmel_conf_pin_config_set(struct pinctrl_dev *pctldev,
unsigned pin,
unsigned long *configs,
unsigned num_configs)
{
struct atmel_group *grp = atmel_pctl_find_group_by_pin(pctldev, pin);
return atmel_conf_pin_config_group_set(pctldev, grp->pin, configs, num_configs);
}
static int atmel_conf_pin_config_get(struct pinctrl_dev *pctldev,
unsigned pin,
unsigned long *configs)
{
struct atmel_group *grp = atmel_pctl_find_group_by_pin(pctldev, pin);
return atmel_conf_pin_config_group_get(pctldev, grp->pin, configs);
}
static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned int pin_id)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
u32 conf;
if (!atmel_pioctrl->pins[pin_id]->device)
return;
seq_printf(s, " (%s, ioset %u) ",
atmel_pioctrl->pins[pin_id]->device,
atmel_pioctrl->pins[pin_id]->ioset);
conf = atmel_pin_config_read(pctldev, pin_id);
if (conf & ATMEL_PIO_PUEN_MASK)
seq_printf(s, "%s ", "pull-up");
if (conf & ATMEL_PIO_PDEN_MASK)
seq_printf(s, "%s ", "pull-down");
if (conf & ATMEL_PIO_IFEN_MASK)
seq_printf(s, "%s ", "debounce");
if (conf & ATMEL_PIO_OPD_MASK)
seq_printf(s, "%s ", "open-drain");
else
seq_printf(s, "%s ", "push-pull");
if (conf & ATMEL_PIO_SCHMITT_MASK)
seq_printf(s, "%s ", "schmitt");
if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
seq_printf(s, "%s ", "slew-rate");
if (conf & ATMEL_PIO_DRVSTR_MASK) {
switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
case ATMEL_PIO_DRVSTR_ME:
seq_printf(s, "%s ", "medium-drive");
break;
case ATMEL_PIO_DRVSTR_HI:
seq_printf(s, "%s ", "high-drive");
break;
/* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */
default:
seq_printf(s, "%s ", "low-drive");
}
}
}
static const struct pinconf_ops atmel_confops = {
.pin_config_group_get = atmel_conf_pin_config_group_get,
.pin_config_group_set = atmel_conf_pin_config_group_set,
.pin_config_dbg_show = atmel_conf_pin_config_dbg_show,
.pin_config_set = atmel_conf_pin_config_set,
.pin_config_get = atmel_conf_pin_config_get,
};
static struct pinctrl_desc atmel_pinctrl_desc = {
.name = "atmel_pinctrl",
.confops = &atmel_confops,
.pctlops = &atmel_pctlops,
.pmxops = &atmel_pmxops,
};
static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
{
struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
int i, j;
/*
* For each bank, save IMR to restore it later and disable all GPIO
* interrupts excepting the ones marked as wakeup sources.
*/
for (i = 0; i < atmel_pioctrl->nbanks; i++) {
atmel_pioctrl->pm_suspend_backup[i].imr =
atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
~atmel_pioctrl->pm_wakeup_sources[i]);
atmel_pioctrl->pm_suspend_backup[i].odsr =
atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
atmel_gpio_write(atmel_pioctrl, i,
ATMEL_PIO_MSKR, BIT(j));
atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
atmel_gpio_read(atmel_pioctrl, i,
ATMEL_PIO_CFGR);
}
}
return 0;
}
static int __maybe_unused atmel_pctrl_resume(struct device *dev)
{
struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
int i, j;
for (i = 0; i < atmel_pioctrl->nbanks; i++) {
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
atmel_pioctrl->pm_suspend_backup[i].imr);
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
atmel_pioctrl->pm_suspend_backup[i].odsr);
for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
atmel_gpio_write(atmel_pioctrl, i,
ATMEL_PIO_MSKR, BIT(j));
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
}
}
return 0;
}
static const struct dev_pm_ops atmel_pctrl_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
};
/*
* The number of banks can be different from a SoC to another one.
* We can have up to 16 banks.
*/
static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
.nbanks = 4,
.last_bank_count = ATMEL_PIO_NPINS_PER_BANK,
};
static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
.nbanks = 5,
.last_bank_count = 8, /* sama7g5 has only PE0 to PE7 */
.slew_rate_support = 1,
};
static const struct of_device_id atmel_pctrl_of_match[] = {
{
.compatible = "atmel,sama5d2-pinctrl",
.data = &atmel_sama5d2_pioctrl_data,
}, {
.compatible = "microchip,sama7g5-pinctrl",
.data = &microchip_sama7g5_pioctrl_data,
}, {
/* sentinel */
}
};
/*
* This lock class allows to tell lockdep that parent IRQ and children IRQ do
* not share the same class so it does not raise false positive
*/
static struct lock_class_key atmel_lock_key;
static struct lock_class_key atmel_request_key;
static int atmel_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pinctrl_pin_desc *pin_desc;
const char **group_names;
int i, ret;
struct atmel_pioctrl *atmel_pioctrl;
const struct atmel_pioctrl_data *atmel_pioctrl_data;
atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
if (!atmel_pioctrl)
return -ENOMEM;
atmel_pioctrl->dev = dev;
atmel_pioctrl->node = dev->of_node;
platform_set_drvdata(pdev, atmel_pioctrl);
atmel_pioctrl_data = device_get_match_data(dev);
if (!atmel_pioctrl_data)
return dev_err_probe(dev, -ENODEV, "Invalid device data\n");
atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
/* if last bank has limited number of pins, adjust accordingly */
if (atmel_pioctrl_data->last_bank_count != ATMEL_PIO_NPINS_PER_BANK) {
atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
}
atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(atmel_pioctrl->reg_base))
return PTR_ERR(atmel_pioctrl->reg_base);
atmel_pioctrl->clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(atmel_pioctrl->clk))
return dev_err_probe(dev, PTR_ERR(atmel_pioctrl->clk), "failed to get clock\n");
atmel_pioctrl->pins = devm_kcalloc(dev,
atmel_pioctrl->npins,
sizeof(*atmel_pioctrl->pins),
GFP_KERNEL);
if (!atmel_pioctrl->pins)
return -ENOMEM;
pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
GFP_KERNEL);
if (!pin_desc)
return -ENOMEM;
atmel_pinctrl_desc.pins = pin_desc;
atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
/* One pin is one group since a pin can achieve all functions. */
group_names = devm_kcalloc(dev,
atmel_pioctrl->npins, sizeof(*group_names),
GFP_KERNEL);
if (!group_names)
return -ENOMEM;
atmel_pioctrl->group_names = group_names;
atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
GFP_KERNEL);
if (!atmel_pioctrl->groups)
return -ENOMEM;
for (i = 0 ; i < atmel_pioctrl->npins; i++) {
struct atmel_group *group = atmel_pioctrl->groups + i;
unsigned int bank = ATMEL_PIO_BANK(i);
unsigned int line = ATMEL_PIO_LINE(i);
atmel_pioctrl->pins[i] = devm_kzalloc(dev,
sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
if (!atmel_pioctrl->pins[i])
return -ENOMEM;
atmel_pioctrl->pins[i]->pin_id = i;
atmel_pioctrl->pins[i]->bank = bank;
atmel_pioctrl->pins[i]->line = line;
pin_desc[i].number = i;
/* Pin naming convention: P(bank_name)(bank_pin_number). */
pin_desc[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "P%c%u",
bank + 'A', line);
if (!pin_desc[i].name)
return -ENOMEM;
group->name = group_names[i] = pin_desc[i].name;
group->pin = pin_desc[i].number;
dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
}
atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
atmel_pioctrl->gpio_chip->label = dev_name(dev);
atmel_pioctrl->gpio_chip->parent = dev;
atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
atmel_pioctrl->gpio_chip->set_config = gpiochip_generic_config;
atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
atmel_pioctrl->nbanks,
sizeof(*atmel_pioctrl->pm_wakeup_sources),
GFP_KERNEL);
if (!atmel_pioctrl->pm_wakeup_sources)
return -ENOMEM;
atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
atmel_pioctrl->nbanks,
sizeof(*atmel_pioctrl->pm_suspend_backup),
GFP_KERNEL);
if (!atmel_pioctrl->pm_suspend_backup)
return -ENOMEM;
atmel_pioctrl->irqs = devm_kcalloc(dev,
atmel_pioctrl->nbanks,
sizeof(*atmel_pioctrl->irqs),
GFP_KERNEL);
if (!atmel_pioctrl->irqs)
return -ENOMEM;
/* There is one controller but each bank has its own irq line. */
for (i = 0; i < atmel_pioctrl->nbanks; i++) {
ret = platform_get_irq(pdev, i);
if (ret < 0) {
dev_dbg(dev, "missing irq resource for group %c\n",
'A' + i);
return ret;
}
atmel_pioctrl->irqs[i] = ret;
irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
}
atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
atmel_pioctrl->gpio_chip->ngpio,
&irq_domain_simple_ops, NULL);
if (!atmel_pioctrl->irq_domain)
return dev_err_probe(dev, -ENODEV, "can't add the irq domain\n");
for (i = 0; i < atmel_pioctrl->npins; i++) {
int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
handle_simple_irq);
irq_set_chip_data(irq, atmel_pioctrl);
irq_set_lockdep_class(irq, &atmel_lock_key, &atmel_request_key);
dev_dbg(dev,
"atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
i, irq);
}
atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
&atmel_pinctrl_desc,
atmel_pioctrl);
if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
dev_err(dev, "pinctrl registration failed\n");
goto irq_domain_remove_error;
}
ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
if (ret) {
dev_err(dev, "failed to add gpiochip\n");
goto irq_domain_remove_error;
}
ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
0, 0, atmel_pioctrl->gpio_chip->ngpio);
if (ret) {
dev_err(dev, "failed to add gpio pin range\n");
goto gpiochip_add_pin_range_error;
}
dev_info(&pdev->dev, "atmel pinctrl initialized\n");
return 0;
gpiochip_add_pin_range_error:
gpiochip_remove(atmel_pioctrl->gpio_chip);
irq_domain_remove_error:
irq_domain_remove(atmel_pioctrl->irq_domain);
return ret;
}
static struct platform_driver atmel_pinctrl_driver = {
.driver = {
.name = "pinctrl-at91-pio4",
.of_match_table = atmel_pctrl_of_match,
.pm = &atmel_pctrl_pm_ops,
.suppress_bind_attrs = true,
},
.probe = atmel_pinctrl_probe,
};
builtin_platform_driver(atmel_pinctrl_driver);