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WSL2-Linux-Kernel/drivers/pinctrl/pinctrl-at91-pio4.c

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C
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// 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_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:
if (arg == 0)
conf &= (~ATMEL_PIO_OPD_MASK);
else
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;
if (atmel_pioctrl->pins[pin_id])
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");
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 */
}
};
static int atmel_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pinctrl_pin_desc *pin_desc;
const char **group_names;
const struct of_device_id *match;
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);
match = of_match_node(atmel_pctrl_of_match, dev->of_node);
if (!match) {
dev_err(dev, "unknown compatible string\n");
return -ENODEV;
}
atmel_pioctrl_data = match->data;
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(dev, NULL);
if (IS_ERR(atmel_pioctrl->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(atmel_pioctrl->clk);
}
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%d",
bank + 'A', line);
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) {
dev_err(dev, "can't add the irq domain\n");
return -ENODEV;
}
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);
dev_dbg(dev,
"atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
i, irq);
}
ret = clk_prepare_enable(atmel_pioctrl->clk);
if (ret) {
dev_err(dev, "failed to prepare and enable clock\n");
goto clk_prepare_enable_error;
}
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 clk_unprep;
}
ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
if (ret) {
dev_err(dev, "failed to add gpiochip\n");
goto clk_unprep;
}
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);
clk_unprep:
clk_disable_unprepare(atmel_pioctrl->clk);
clk_prepare_enable_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);
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