linux/drivers/pinctrl/pinctrl-at91-pio4.c
Julia Lawall 8b74c7d3e3 pinctrl: at91-pio4: account for const type of of_device_id.data
This driver creates a const structure that it stores in the data field
of an of_device_id array.

Adding const to the declaration of the location that receives the
const value from the data field ensures that the compiler will
continue to check that the value is not modified.  Furthermore, the
const-discarding cast on the extraction from the data field is no
longer needed.

Done using Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-01-08 08:15:47 +01:00

1107 lines
30 KiB
C

/*
* Driver for the Atmel PIO4 controller
*
* Copyright (C) 2015 Atmel,
* 2015 Ludovic Desroches <ludovic.desroches@atmel.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/clk.h>
#include <linux/gpio/driver.h>
/* FIXME: needed for gpio_to_irq(), get rid of this */
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.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_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_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)
struct atmel_pioctrl_data {
unsigned nbanks;
};
struct atmel_group {
const char *name;
u32 pin;
};
struct atmel_pin {
unsigned pin_id;
unsigned mux;
unsigned ioset;
unsigned bank;
unsigned 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.
* @dev: device entry for the Atmel PIO controller.
* @node: node of the Atmel PIO controller.
*/
struct atmel_pioctrl {
void __iomem *reg_base;
struct clk *clk;
unsigned nbanks;
struct pinctrl_dev *pinctrl_dev;
struct atmel_group *groups;
const char * const *group_names;
struct atmel_pin **pins;
unsigned npins;
struct gpio_chip *gpio_chip;
struct irq_domain *irq_domain;
int *irqs;
unsigned *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;
};
static const char * const atmel_functions[] = {
"GPIO", "A", "B", "C", "D", "E", "F", "G"
};
/* --- 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 type)
{
struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
unsigned 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));
}
#ifdef CONFIG_PM_SLEEP
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;
}
#else
#define atmel_gpio_irq_set_wake NULL
#endif /* CONFIG_PM_SLEEP */
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 = atmel_gpio_irq_set_wake,
};
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(gpio_to_irq(bank *
ATMEL_PIO_NPINS_PER_BANK + n));
}
chained_irq_exit(chip, desc);
}
static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned 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 offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned reg;
reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
return !!(reg & BIT(pin->line));
}
static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
struct atmel_pin *pin = atmel_pioctrl->pins[offset];
unsigned 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 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 int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
}
static struct gpio_chip atmel_gpio_chip = {
.direction_input = atmel_gpio_direction_input,
.get = atmel_gpio_get,
.direction_output = atmel_gpio_direction_output,
.set = atmel_gpio_set,
.to_irq = atmel_gpio_to_irq,
.base = 0,
};
/* --- PINCTRL --- */
static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
unsigned pin_id)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
unsigned 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 pin_id, u32 conf)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
unsigned 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 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 selector, const unsigned **pins,
unsigned *num_pins)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
*pins = (unsigned *)&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 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 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 *reserved_maps,
unsigned *num_maps)
{
unsigned num_pins, num_configs, reserve;
unsigned long *configs;
struct property *pins;
bool has_config;
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;
}
if (num_configs)
has_config = true;
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 (has_config && num_pins >= 1)
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 (has_config) {
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 *num_maps)
{
struct device_node *np;
unsigned 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)
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 selector)
{
return atmel_functions[selector];
}
static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
unsigned 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 function,
unsigned group)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned 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 group,
unsigned long *config)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
unsigned param = pinconf_to_config_param(*config), arg = 0;
struct atmel_group *grp = atmel_pioctrl->groups + group;
unsigned 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;
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 group,
unsigned long *configs,
unsigned num_configs)
{
struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
struct atmel_group *grp = atmel_pioctrl->groups + group;
unsigned bank, pin, pin_id = grp->pin;
u32 mask, conf = 0;
int i;
conf = atmel_pin_config_read(pctldev, pin_id);
for (i = 0; i < num_configs; i++) {
unsigned param = pinconf_to_config_param(configs[i]);
unsigned 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;
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 void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned 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");
}
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,
};
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 platform_device *pdev = to_platform_device(dev);
struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
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 platform_device *pdev = to_platform_device(dev);
struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
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,
};
static const struct of_device_id atmel_pctrl_of_match[] = {
{
.compatible = "atmel,sama5d2-pinctrl",
.data = &atmel_sama5d2_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 resource *res;
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;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "unable to get atmel pinctrl resource\n");
return -EINVAL;
}
atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(atmel_pioctrl->reg_base))
return -EINVAL;
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_kzalloc(dev, sizeof(*atmel_pioctrl->pins)
* atmel_pioctrl->npins, GFP_KERNEL);
if (!atmel_pioctrl->pins)
return -ENOMEM;
pin_desc = devm_kzalloc(dev, sizeof(*pin_desc)
* atmel_pioctrl->npins, GFP_KERNEL);
if (!pin_desc)
return -ENOMEM;
atmel_pinctrl_desc.pins = pin_desc;
atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
/* One pin is one group since a pin can achieve all functions. */
group_names = devm_kzalloc(dev, sizeof(*group_names)
* atmel_pioctrl->npins, GFP_KERNEL);
if (!group_names)
return -ENOMEM;
atmel_pioctrl->group_names = group_names;
atmel_pioctrl->groups = devm_kzalloc(&pdev->dev,
sizeof(*atmel_pioctrl->groups) * atmel_pioctrl->npins,
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 bank = ATMEL_PIO_BANK(i);
unsigned 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 = kasprintf(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->of_node = dev->of_node;
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->pm_wakeup_sources = devm_kzalloc(dev,
sizeof(*atmel_pioctrl->pm_wakeup_sources)
* atmel_pioctrl->nbanks, GFP_KERNEL);
if (!atmel_pioctrl->pm_wakeup_sources)
return -ENOMEM;
atmel_pioctrl->pm_suspend_backup = devm_kzalloc(dev,
sizeof(*atmel_pioctrl->pm_suspend_backup)
* atmel_pioctrl->nbanks, GFP_KERNEL);
if (!atmel_pioctrl->pm_suspend_backup)
return -ENOMEM;
atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs)
* atmel_pioctrl->nbanks, 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++) {
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
if (!res) {
dev_err(dev, "missing irq resource for group %c\n",
'A' + i);
return -EINVAL;
}
atmel_pioctrl->irqs[i] = res->start;
irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
irq_set_handler_data(res->start, atmel_pioctrl);
dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
}
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;
}
atmel_pioctrl->irq_domain->name = "atmel gpio";
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);