linux/drivers/pinctrl/pinctrl-at91.c
Andy Shevchenko 8a8d6bbe1d pinctrl: Get rid of duplicate of_node assignment in the drivers
GPIO library does copy the of_node from the parent device of
the GPIO chip, there is no need to repeat this in the individual
drivers. Remove these assignment all at once.

For the details one may look into the of_gpio_dev_init() implementation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211214125855.33207-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2021-12-16 04:18:30 +01:00

1955 lines
52 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* at91 pinctrl driver based on at91 pinmux core
*
* Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
/* Since we request GPIOs from ourself */
#include <linux/pinctrl/consumer.h>
#include <soc/at91/pm.h>
#include "pinctrl-at91.h"
#include "core.h"
#define MAX_GPIO_BANKS 5
#define MAX_NB_GPIO_PER_BANK 32
struct at91_pinctrl_mux_ops;
struct at91_gpio_chip {
struct gpio_chip chip;
struct pinctrl_gpio_range range;
struct at91_gpio_chip *next; /* Bank sharing same clock */
int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
int pioc_virq; /* PIO bank Linux virtual interrupt */
int pioc_idx; /* PIO bank index */
void __iomem *regbase; /* PIO bank virtual address */
struct clk *clock; /* associated clock */
const struct at91_pinctrl_mux_ops *ops; /* ops */
};
static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
static int gpio_banks;
#define PULL_UP (1 << 0)
#define MULTI_DRIVE (1 << 1)
#define DEGLITCH (1 << 2)
#define PULL_DOWN (1 << 3)
#define DIS_SCHMIT (1 << 4)
#define DRIVE_STRENGTH_SHIFT 5
#define DRIVE_STRENGTH_MASK 0x3
#define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
#define OUTPUT (1 << 7)
#define OUTPUT_VAL_SHIFT 8
#define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT)
#define SLEWRATE_SHIFT 9
#define SLEWRATE_MASK 0x1
#define SLEWRATE (SLEWRATE_MASK << SLEWRATE_SHIFT)
#define DEBOUNCE (1 << 16)
#define DEBOUNCE_VAL_SHIFT 17
#define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
/*
* These defines will translated the dt binding settings to our internal
* settings. They are not necessarily the same value as the register setting.
* The actual drive strength current of low, medium and high must be looked up
* from the corresponding device datasheet. This value is different for pins
* that are even in the same banks. It is also dependent on VCC.
* DRIVE_STRENGTH_DEFAULT is just a placeholder to avoid changing the drive
* strength when there is no dt config for it.
*/
enum drive_strength_bit {
DRIVE_STRENGTH_BIT_DEF,
DRIVE_STRENGTH_BIT_LOW,
DRIVE_STRENGTH_BIT_MED,
DRIVE_STRENGTH_BIT_HI,
};
#define DRIVE_STRENGTH_BIT_MSK(name) (DRIVE_STRENGTH_BIT_##name << \
DRIVE_STRENGTH_SHIFT)
enum slewrate_bit {
SLEWRATE_BIT_ENA,
SLEWRATE_BIT_DIS,
};
#define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_SHIFT)
/**
* struct at91_pmx_func - describes AT91 pinmux functions
* @name: the name of this specific function
* @groups: corresponding pin groups
* @ngroups: the number of groups
*/
struct at91_pmx_func {
const char *name;
const char **groups;
unsigned ngroups;
};
enum at91_mux {
AT91_MUX_GPIO = 0,
AT91_MUX_PERIPH_A = 1,
AT91_MUX_PERIPH_B = 2,
AT91_MUX_PERIPH_C = 3,
AT91_MUX_PERIPH_D = 4,
};
/**
* struct at91_pmx_pin - describes an At91 pin mux
* @bank: the bank of the pin
* @pin: the pin number in the @bank
* @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
* @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
*/
struct at91_pmx_pin {
uint32_t bank;
uint32_t pin;
enum at91_mux mux;
unsigned long conf;
};
/**
* struct at91_pin_group - describes an At91 pin group
* @name: the name of this specific pin group
* @pins_conf: the mux mode for each pin in this group. The size of this
* array is the same as pins.
* @pins: an array of discrete physical pins used in this group, taken
* from the driver-local pin enumeration space
* @npins: the number of pins in this group array, i.e. the number of
* elements in .pins so we can iterate over that array
*/
struct at91_pin_group {
const char *name;
struct at91_pmx_pin *pins_conf;
unsigned int *pins;
unsigned npins;
};
/**
* struct at91_pinctrl_mux_ops - describes an AT91 mux ops group
* on new IP with support for periph C and D the way to mux in
* periph A and B has changed
* So provide the right call back
* if not present means the IP does not support it
* @get_periph: return the periph mode configured
* @mux_A_periph: mux as periph A
* @mux_B_periph: mux as periph B
* @mux_C_periph: mux as periph C
* @mux_D_periph: mux as periph D
* @get_deglitch: get deglitch status
* @set_deglitch: enable/disable deglitch
* @get_debounce: get debounce status
* @set_debounce: enable/disable debounce
* @get_pulldown: get pulldown status
* @set_pulldown: enable/disable pulldown
* @get_schmitt_trig: get schmitt trigger status
* @disable_schmitt_trig: disable schmitt trigger
* @get_drivestrength: get driver strength
* @set_drivestrength: set driver strength
* @get_slewrate: get slew rate
* @set_slewrate: set slew rate
* @irq_type: return irq type
*/
struct at91_pinctrl_mux_ops {
enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
void (*mux_A_periph)(void __iomem *pio, unsigned mask);
void (*mux_B_periph)(void __iomem *pio, unsigned mask);
void (*mux_C_periph)(void __iomem *pio, unsigned mask);
void (*mux_D_periph)(void __iomem *pio, unsigned mask);
bool (*get_deglitch)(void __iomem *pio, unsigned pin);
void (*set_deglitch)(void __iomem *pio, unsigned mask, bool is_on);
bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
bool (*get_pulldown)(void __iomem *pio, unsigned pin);
void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_on);
bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
unsigned (*get_drivestrength)(void __iomem *pio, unsigned pin);
void (*set_drivestrength)(void __iomem *pio, unsigned pin,
u32 strength);
unsigned (*get_slewrate)(void __iomem *pio, unsigned pin);
void (*set_slewrate)(void __iomem *pio, unsigned pin, u32 slewrate);
/* irq */
int (*irq_type)(struct irq_data *d, unsigned type);
};
static int gpio_irq_type(struct irq_data *d, unsigned type);
static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
struct at91_pinctrl {
struct device *dev;
struct pinctrl_dev *pctl;
int nactive_banks;
uint32_t *mux_mask;
int nmux;
struct at91_pmx_func *functions;
int nfunctions;
struct at91_pin_group *groups;
int ngroups;
const struct at91_pinctrl_mux_ops *ops;
};
static inline const struct at91_pin_group *at91_pinctrl_find_group_by_name(
const struct at91_pinctrl *info,
const char *name)
{
const struct at91_pin_group *grp = NULL;
int i;
for (i = 0; i < info->ngroups; i++) {
if (strcmp(info->groups[i].name, name))
continue;
grp = &info->groups[i];
dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
break;
}
return grp;
}
static int at91_get_groups_count(struct pinctrl_dev *pctldev)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->ngroups;
}
static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->groups[selector].name;
}
static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
const unsigned **pins,
unsigned *npins)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
if (selector >= info->ngroups)
return -EINVAL;
*pins = info->groups[selector].pins;
*npins = info->groups[selector].npins;
return 0;
}
static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned offset)
{
seq_printf(s, "%s", dev_name(pctldev->dev));
}
static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map, unsigned *num_maps)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
const struct at91_pin_group *grp;
struct pinctrl_map *new_map;
struct device_node *parent;
int map_num = 1;
int i;
/*
* first find the group of this node and check if we need to create
* config maps for pins
*/
grp = at91_pinctrl_find_group_by_name(info, np->name);
if (!grp) {
dev_err(info->dev, "unable to find group for node %pOFn\n",
np);
return -EINVAL;
}
map_num += grp->npins;
new_map = devm_kcalloc(pctldev->dev, map_num, sizeof(*new_map),
GFP_KERNEL);
if (!new_map)
return -ENOMEM;
*map = new_map;
*num_maps = map_num;
/* create mux map */
parent = of_get_parent(np);
if (!parent) {
devm_kfree(pctldev->dev, new_map);
return -EINVAL;
}
new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
new_map[0].data.mux.function = parent->name;
new_map[0].data.mux.group = np->name;
of_node_put(parent);
/* create config map */
new_map++;
for (i = 0; i < grp->npins; i++) {
new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
new_map[i].data.configs.group_or_pin =
pin_get_name(pctldev, grp->pins[i]);
new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
new_map[i].data.configs.num_configs = 1;
}
dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
(*map)->data.mux.function, (*map)->data.mux.group, map_num);
return 0;
}
static void at91_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps)
{
}
static const struct pinctrl_ops at91_pctrl_ops = {
.get_groups_count = at91_get_groups_count,
.get_group_name = at91_get_group_name,
.get_group_pins = at91_get_group_pins,
.pin_dbg_show = at91_pin_dbg_show,
.dt_node_to_map = at91_dt_node_to_map,
.dt_free_map = at91_dt_free_map,
};
static void __iomem *pin_to_controller(struct at91_pinctrl *info,
unsigned int bank)
{
if (!gpio_chips[bank])
return NULL;
return gpio_chips[bank]->regbase;
}
static inline int pin_to_bank(unsigned pin)
{
return pin /= MAX_NB_GPIO_PER_BANK;
}
static unsigned pin_to_mask(unsigned int pin)
{
return 1 << pin;
}
static unsigned two_bit_pin_value_shift_amount(unsigned int pin)
{
/* return the shift value for a pin for "two bit" per pin registers,
* i.e. drive strength */
return 2*((pin >= MAX_NB_GPIO_PER_BANK/2)
? pin - MAX_NB_GPIO_PER_BANK/2 : pin);
}
static unsigned sama5d3_get_drive_register(unsigned int pin)
{
/* drive strength is split between two registers
* with two bits per pin */
return (pin >= MAX_NB_GPIO_PER_BANK/2)
? SAMA5D3_PIO_DRIVER2 : SAMA5D3_PIO_DRIVER1;
}
static unsigned at91sam9x5_get_drive_register(unsigned int pin)
{
/* drive strength is split between two registers
* with two bits per pin */
return (pin >= MAX_NB_GPIO_PER_BANK/2)
? AT91SAM9X5_PIO_DRIVER2 : AT91SAM9X5_PIO_DRIVER1;
}
static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
{
writel_relaxed(mask, pio + PIO_IDR);
}
static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
{
return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1);
}
static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
{
if (on)
writel_relaxed(mask, pio + PIO_PPDDR);
writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
}
static bool at91_mux_get_output(void __iomem *pio, unsigned int pin, bool *val)
{
*val = (readl_relaxed(pio + PIO_ODSR) >> pin) & 0x1;
return (readl_relaxed(pio + PIO_OSR) >> pin) & 0x1;
}
static void at91_mux_set_output(void __iomem *pio, unsigned int mask,
bool is_on, bool val)
{
writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
writel_relaxed(mask, pio + (is_on ? PIO_OER : PIO_ODR));
}
static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
{
return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
}
static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
{
writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
}
static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(mask, pio + PIO_ASR);
}
static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(mask, pio + PIO_BSR);
}
static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
pio + PIO_ABCDSR1);
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
pio + PIO_ABCDSR2);
}
static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
pio + PIO_ABCDSR1);
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
pio + PIO_ABCDSR2);
}
static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
}
static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
{
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
}
static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
{
unsigned select;
if (readl_relaxed(pio + PIO_PSR) & mask)
return AT91_MUX_GPIO;
select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
return select + 1;
}
static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
{
unsigned select;
if (readl_relaxed(pio + PIO_PSR) & mask)
return AT91_MUX_GPIO;
select = readl_relaxed(pio + PIO_ABSR) & mask;
return select + 1;
}
static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
{
return (readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1;
}
static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
{
writel_relaxed(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
}
static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
{
if ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1)
return !((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
return false;
}
static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
{
if (is_on)
writel_relaxed(mask, pio + PIO_IFSCDR);
at91_mux_set_deglitch(pio, mask, is_on);
}
static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
{
*div = readl_relaxed(pio + PIO_SCDR);
return ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1) &&
((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
}
static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
bool is_on, u32 div)
{
if (is_on) {
writel_relaxed(mask, pio + PIO_IFSCER);
writel_relaxed(div & PIO_SCDR_DIV, pio + PIO_SCDR);
writel_relaxed(mask, pio + PIO_IFER);
} else
writel_relaxed(mask, pio + PIO_IFSCDR);
}
static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
{
return !((readl_relaxed(pio + PIO_PPDSR) >> pin) & 0x1);
}
static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
{
if (is_on)
writel_relaxed(mask, pio + PIO_PUDR);
writel_relaxed(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
}
static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
{
writel_relaxed(readl_relaxed(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
}
static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
{
return (readl_relaxed(pio + PIO_SCHMITT) >> pin) & 0x1;
}
static inline u32 read_drive_strength(void __iomem *reg, unsigned pin)
{
unsigned tmp = readl_relaxed(reg);
tmp = tmp >> two_bit_pin_value_shift_amount(pin);
return tmp & DRIVE_STRENGTH_MASK;
}
static unsigned at91_mux_sama5d3_get_drivestrength(void __iomem *pio,
unsigned pin)
{
unsigned tmp = read_drive_strength(pio +
sama5d3_get_drive_register(pin), pin);
/* SAMA5 strength is 1:1 with our defines,
* except 0 is equivalent to low per datasheet */
if (!tmp)
tmp = DRIVE_STRENGTH_BIT_MSK(LOW);
return tmp;
}
static unsigned at91_mux_sam9x5_get_drivestrength(void __iomem *pio,
unsigned pin)
{
unsigned tmp = read_drive_strength(pio +
at91sam9x5_get_drive_register(pin), pin);
/* strength is inverse in SAM9x5s hardware with the pinctrl defines
* hardware: 0 = hi, 1 = med, 2 = low, 3 = rsvd */
tmp = DRIVE_STRENGTH_BIT_MSK(HI) - tmp;
return tmp;
}
static unsigned at91_mux_sam9x60_get_drivestrength(void __iomem *pio,
unsigned pin)
{
unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
if (tmp & BIT(pin))
return DRIVE_STRENGTH_BIT_HI;
return DRIVE_STRENGTH_BIT_LOW;
}
static unsigned at91_mux_sam9x60_get_slewrate(void __iomem *pio, unsigned pin)
{
unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
if ((tmp & BIT(pin)))
return SLEWRATE_BIT_ENA;
return SLEWRATE_BIT_DIS;
}
static void set_drive_strength(void __iomem *reg, unsigned pin, u32 strength)
{
unsigned tmp = readl_relaxed(reg);
unsigned shift = two_bit_pin_value_shift_amount(pin);
tmp &= ~(DRIVE_STRENGTH_MASK << shift);
tmp |= strength << shift;
writel_relaxed(tmp, reg);
}
static void at91_mux_sama5d3_set_drivestrength(void __iomem *pio, unsigned pin,
u32 setting)
{
/* do nothing if setting is zero */
if (!setting)
return;
/* strength is 1 to 1 with setting for SAMA5 */
set_drive_strength(pio + sama5d3_get_drive_register(pin), pin, setting);
}
static void at91_mux_sam9x5_set_drivestrength(void __iomem *pio, unsigned pin,
u32 setting)
{
/* do nothing if setting is zero */
if (!setting)
return;
/* strength is inverse on SAM9x5s with our defines
* 0 = hi, 1 = med, 2 = low, 3 = rsvd */
setting = DRIVE_STRENGTH_BIT_MSK(HI) - setting;
set_drive_strength(pio + at91sam9x5_get_drive_register(pin), pin,
setting);
}
static void at91_mux_sam9x60_set_drivestrength(void __iomem *pio, unsigned pin,
u32 setting)
{
unsigned int tmp;
if (setting <= DRIVE_STRENGTH_BIT_DEF ||
setting == DRIVE_STRENGTH_BIT_MED ||
setting > DRIVE_STRENGTH_BIT_HI)
return;
tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
/* Strength is 0: low, 1: hi */
if (setting == DRIVE_STRENGTH_BIT_LOW)
tmp &= ~BIT(pin);
else
tmp |= BIT(pin);
writel_relaxed(tmp, pio + SAM9X60_PIO_DRIVER1);
}
static void at91_mux_sam9x60_set_slewrate(void __iomem *pio, unsigned pin,
u32 setting)
{
unsigned int tmp;
if (setting < SLEWRATE_BIT_ENA || setting > SLEWRATE_BIT_DIS)
return;
tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
if (setting == SLEWRATE_BIT_DIS)
tmp &= ~BIT(pin);
else
tmp |= BIT(pin);
writel_relaxed(tmp, pio + SAM9X60_PIO_SLEWR);
}
static const struct at91_pinctrl_mux_ops at91rm9200_ops = {
.get_periph = at91_mux_get_periph,
.mux_A_periph = at91_mux_set_A_periph,
.mux_B_periph = at91_mux_set_B_periph,
.get_deglitch = at91_mux_get_deglitch,
.set_deglitch = at91_mux_set_deglitch,
.irq_type = gpio_irq_type,
};
static const struct at91_pinctrl_mux_ops at91sam9x5_ops = {
.get_periph = at91_mux_pio3_get_periph,
.mux_A_periph = at91_mux_pio3_set_A_periph,
.mux_B_periph = at91_mux_pio3_set_B_periph,
.mux_C_periph = at91_mux_pio3_set_C_periph,
.mux_D_periph = at91_mux_pio3_set_D_periph,
.get_deglitch = at91_mux_pio3_get_deglitch,
.set_deglitch = at91_mux_pio3_set_deglitch,
.get_debounce = at91_mux_pio3_get_debounce,
.set_debounce = at91_mux_pio3_set_debounce,
.get_pulldown = at91_mux_pio3_get_pulldown,
.set_pulldown = at91_mux_pio3_set_pulldown,
.get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.get_drivestrength = at91_mux_sam9x5_get_drivestrength,
.set_drivestrength = at91_mux_sam9x5_set_drivestrength,
.irq_type = alt_gpio_irq_type,
};
static const struct at91_pinctrl_mux_ops sam9x60_ops = {
.get_periph = at91_mux_pio3_get_periph,
.mux_A_periph = at91_mux_pio3_set_A_periph,
.mux_B_periph = at91_mux_pio3_set_B_periph,
.mux_C_periph = at91_mux_pio3_set_C_periph,
.mux_D_periph = at91_mux_pio3_set_D_periph,
.get_deglitch = at91_mux_pio3_get_deglitch,
.set_deglitch = at91_mux_pio3_set_deglitch,
.get_debounce = at91_mux_pio3_get_debounce,
.set_debounce = at91_mux_pio3_set_debounce,
.get_pulldown = at91_mux_pio3_get_pulldown,
.set_pulldown = at91_mux_pio3_set_pulldown,
.get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.get_drivestrength = at91_mux_sam9x60_get_drivestrength,
.set_drivestrength = at91_mux_sam9x60_set_drivestrength,
.get_slewrate = at91_mux_sam9x60_get_slewrate,
.set_slewrate = at91_mux_sam9x60_set_slewrate,
.irq_type = alt_gpio_irq_type,
};
static const struct at91_pinctrl_mux_ops sama5d3_ops = {
.get_periph = at91_mux_pio3_get_periph,
.mux_A_periph = at91_mux_pio3_set_A_periph,
.mux_B_periph = at91_mux_pio3_set_B_periph,
.mux_C_periph = at91_mux_pio3_set_C_periph,
.mux_D_periph = at91_mux_pio3_set_D_periph,
.get_deglitch = at91_mux_pio3_get_deglitch,
.set_deglitch = at91_mux_pio3_set_deglitch,
.get_debounce = at91_mux_pio3_get_debounce,
.set_debounce = at91_mux_pio3_set_debounce,
.get_pulldown = at91_mux_pio3_get_pulldown,
.set_pulldown = at91_mux_pio3_set_pulldown,
.get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.get_drivestrength = at91_mux_sama5d3_get_drivestrength,
.set_drivestrength = at91_mux_sama5d3_set_drivestrength,
.irq_type = alt_gpio_irq_type,
};
static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
{
if (pin->mux) {
dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lx\n",
pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
} else {
dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lx\n",
pin->bank + 'A', pin->pin, pin->conf);
}
}
static int pin_check_config(struct at91_pinctrl *info, const char *name,
int index, const struct at91_pmx_pin *pin)
{
int mux;
/* check if it's a valid config */
if (pin->bank >= gpio_banks) {
dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
name, index, pin->bank, gpio_banks);
return -EINVAL;
}
if (!gpio_chips[pin->bank]) {
dev_err(info->dev, "%s: pin conf %d bank_id %d not enabled\n",
name, index, pin->bank);
return -ENXIO;
}
if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
return -EINVAL;
}
if (!pin->mux)
return 0;
mux = pin->mux - 1;
if (mux >= info->nmux) {
dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
name, index, mux, info->nmux);
return -EINVAL;
}
if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
name, index, mux, pin->bank + 'A', pin->pin);
return -EINVAL;
}
return 0;
}
static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
{
writel_relaxed(mask, pio + PIO_PDR);
}
static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
{
writel_relaxed(mask, pio + PIO_PER);
writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
}
static int at91_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
const struct at91_pmx_pin *pin;
uint32_t npins = info->groups[group].npins;
int i, ret;
unsigned mask;
void __iomem *pio;
dev_dbg(info->dev, "enable function %s group %s\n",
info->functions[selector].name, info->groups[group].name);
/* first check that all the pins of the group are valid with a valid
* parameter */
for (i = 0; i < npins; i++) {
pin = &pins_conf[i];
ret = pin_check_config(info, info->groups[group].name, i, pin);
if (ret)
return ret;
}
for (i = 0; i < npins; i++) {
pin = &pins_conf[i];
at91_pin_dbg(info->dev, pin);
pio = pin_to_controller(info, pin->bank);
if (!pio)
continue;
mask = pin_to_mask(pin->pin);
at91_mux_disable_interrupt(pio, mask);
switch (pin->mux) {
case AT91_MUX_GPIO:
at91_mux_gpio_enable(pio, mask, 1);
break;
case AT91_MUX_PERIPH_A:
info->ops->mux_A_periph(pio, mask);
break;
case AT91_MUX_PERIPH_B:
info->ops->mux_B_periph(pio, mask);
break;
case AT91_MUX_PERIPH_C:
if (!info->ops->mux_C_periph)
return -EINVAL;
info->ops->mux_C_periph(pio, mask);
break;
case AT91_MUX_PERIPH_D:
if (!info->ops->mux_D_periph)
return -EINVAL;
info->ops->mux_D_periph(pio, mask);
break;
}
if (pin->mux)
at91_mux_gpio_disable(pio, mask);
}
return 0;
}
static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->nfunctions;
}
static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
return info->functions[selector].name;
}
static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
*groups = info->functions[selector].groups;
*num_groups = info->functions[selector].ngroups;
return 0;
}
static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
struct at91_gpio_chip *at91_chip;
struct gpio_chip *chip;
unsigned mask;
if (!range) {
dev_err(npct->dev, "invalid range\n");
return -EINVAL;
}
if (!range->gc) {
dev_err(npct->dev, "missing GPIO chip in range\n");
return -EINVAL;
}
chip = range->gc;
at91_chip = gpiochip_get_data(chip);
dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
mask = 1 << (offset - chip->base);
dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
offset, 'A' + range->id, offset - chip->base, mask);
writel_relaxed(mask, at91_chip->regbase + PIO_PER);
return 0;
}
static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
/* Set the pin to some default state, GPIO is usually default */
}
static const struct pinmux_ops at91_pmx_ops = {
.get_functions_count = at91_pmx_get_funcs_count,
.get_function_name = at91_pmx_get_func_name,
.get_function_groups = at91_pmx_get_groups,
.set_mux = at91_pmx_set,
.gpio_request_enable = at91_gpio_request_enable,
.gpio_disable_free = at91_gpio_disable_free,
};
static int at91_pinconf_get(struct pinctrl_dev *pctldev,
unsigned pin_id, unsigned long *config)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
void __iomem *pio;
unsigned pin;
int div;
bool out;
*config = 0;
dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
pio = pin_to_controller(info, pin_to_bank(pin_id));
if (!pio)
return -EINVAL;
pin = pin_id % MAX_NB_GPIO_PER_BANK;
if (at91_mux_get_multidrive(pio, pin))
*config |= MULTI_DRIVE;
if (at91_mux_get_pullup(pio, pin))
*config |= PULL_UP;
if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
*config |= DEGLITCH;
if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
*config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
*config |= PULL_DOWN;
if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
*config |= DIS_SCHMIT;
if (info->ops->get_drivestrength)
*config |= (info->ops->get_drivestrength(pio, pin)
<< DRIVE_STRENGTH_SHIFT);
if (info->ops->get_slewrate)
*config |= (info->ops->get_slewrate(pio, pin) << SLEWRATE_SHIFT);
if (at91_mux_get_output(pio, pin, &out))
*config |= OUTPUT | (out << OUTPUT_VAL_SHIFT);
return 0;
}
static int at91_pinconf_set(struct pinctrl_dev *pctldev,
unsigned pin_id, unsigned long *configs,
unsigned num_configs)
{
struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
unsigned mask;
void __iomem *pio;
int i;
unsigned long config;
unsigned pin;
for (i = 0; i < num_configs; i++) {
config = configs[i];
dev_dbg(info->dev,
"%s:%d, pin_id=%d, config=0x%lx",
__func__, __LINE__, pin_id, config);
pio = pin_to_controller(info, pin_to_bank(pin_id));
if (!pio)
return -EINVAL;
pin = pin_id % MAX_NB_GPIO_PER_BANK;
mask = pin_to_mask(pin);
if (config & PULL_UP && config & PULL_DOWN)
return -EINVAL;
at91_mux_set_output(pio, mask, config & OUTPUT,
(config & OUTPUT_VAL) >> OUTPUT_VAL_SHIFT);
at91_mux_set_pullup(pio, mask, config & PULL_UP);
at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
if (info->ops->set_deglitch)
info->ops->set_deglitch(pio, mask, config & DEGLITCH);
if (info->ops->set_debounce)
info->ops->set_debounce(pio, mask, config & DEBOUNCE,
(config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
if (info->ops->set_pulldown)
info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
info->ops->disable_schmitt_trig(pio, mask);
if (info->ops->set_drivestrength)
info->ops->set_drivestrength(pio, pin,
(config & DRIVE_STRENGTH)
>> DRIVE_STRENGTH_SHIFT);
if (info->ops->set_slewrate)
info->ops->set_slewrate(pio, pin,
(config & SLEWRATE) >> SLEWRATE_SHIFT);
} /* for each config */
return 0;
}
#define DBG_SHOW_FLAG(flag) do { \
if (config & flag) { \
if (num_conf) \
seq_puts(s, "|"); \
seq_puts(s, #flag); \
num_conf++; \
} \
} while (0)
#define DBG_SHOW_FLAG_MASKED(mask, flag, name) do { \
if ((config & mask) == flag) { \
if (num_conf) \
seq_puts(s, "|"); \
seq_puts(s, #name); \
num_conf++; \
} \
} while (0)
static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin_id)
{
unsigned long config;
int val, num_conf = 0;
at91_pinconf_get(pctldev, pin_id, &config);
DBG_SHOW_FLAG(MULTI_DRIVE);
DBG_SHOW_FLAG(PULL_UP);
DBG_SHOW_FLAG(PULL_DOWN);
DBG_SHOW_FLAG(DIS_SCHMIT);
DBG_SHOW_FLAG(DEGLITCH);
DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(LOW),
DRIVE_STRENGTH_LOW);
DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(MED),
DRIVE_STRENGTH_MED);
DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(HI),
DRIVE_STRENGTH_HI);
DBG_SHOW_FLAG(SLEWRATE);
DBG_SHOW_FLAG(DEBOUNCE);
if (config & DEBOUNCE) {
val = config >> DEBOUNCE_VAL_SHIFT;
seq_printf(s, "(%d)", val);
}
return;
}
static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned group)
{
}
static const struct pinconf_ops at91_pinconf_ops = {
.pin_config_get = at91_pinconf_get,
.pin_config_set = at91_pinconf_set,
.pin_config_dbg_show = at91_pinconf_dbg_show,
.pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
};
static struct pinctrl_desc at91_pinctrl_desc = {
.pctlops = &at91_pctrl_ops,
.pmxops = &at91_pmx_ops,
.confops = &at91_pinconf_ops,
.owner = THIS_MODULE,
};
static const char *gpio_compat = "atmel,at91rm9200-gpio";
static void at91_pinctrl_child_count(struct at91_pinctrl *info,
struct device_node *np)
{
struct device_node *child;
for_each_child_of_node(np, child) {
if (of_device_is_compatible(child, gpio_compat)) {
if (of_device_is_available(child))
info->nactive_banks++;
} else {
info->nfunctions++;
info->ngroups += of_get_child_count(child);
}
}
}
static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
struct device_node *np)
{
int ret = 0;
int size;
const __be32 *list;
list = of_get_property(np, "atmel,mux-mask", &size);
if (!list) {
dev_err(info->dev, "can not read the mux-mask of %d\n", size);
return -EINVAL;
}
size /= sizeof(*list);
if (!size || size % gpio_banks) {
dev_err(info->dev, "wrong mux mask array should be by %d\n", gpio_banks);
return -EINVAL;
}
info->nmux = size / gpio_banks;
info->mux_mask = devm_kcalloc(info->dev, size, sizeof(u32),
GFP_KERNEL);
if (!info->mux_mask)
return -ENOMEM;
ret = of_property_read_u32_array(np, "atmel,mux-mask",
info->mux_mask, size);
if (ret)
dev_err(info->dev, "can not read the mux-mask of %d\n", size);
return ret;
}
static int at91_pinctrl_parse_groups(struct device_node *np,
struct at91_pin_group *grp,
struct at91_pinctrl *info, u32 index)
{
struct at91_pmx_pin *pin;
int size;
const __be32 *list;
int i, j;
dev_dbg(info->dev, "group(%d): %pOFn\n", index, np);
/* Initialise group */
grp->name = np->name;
/*
* the binding format is atmel,pins = <bank pin mux CONFIG ...>,
* do sanity check and calculate pins number
*/
list = of_get_property(np, "atmel,pins", &size);
/* we do not check return since it's safe node passed down */
size /= sizeof(*list);
if (!size || size % 4) {
dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
return -EINVAL;
}
grp->npins = size / 4;
pin = grp->pins_conf = devm_kcalloc(info->dev,
grp->npins,
sizeof(struct at91_pmx_pin),
GFP_KERNEL);
grp->pins = devm_kcalloc(info->dev, grp->npins, sizeof(unsigned int),
GFP_KERNEL);
if (!grp->pins_conf || !grp->pins)
return -ENOMEM;
for (i = 0, j = 0; i < size; i += 4, j++) {
pin->bank = be32_to_cpu(*list++);
pin->pin = be32_to_cpu(*list++);
grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
pin->mux = be32_to_cpu(*list++);
pin->conf = be32_to_cpu(*list++);
at91_pin_dbg(info->dev, pin);
pin++;
}
return 0;
}
static int at91_pinctrl_parse_functions(struct device_node *np,
struct at91_pinctrl *info, u32 index)
{
struct device_node *child;
struct at91_pmx_func *func;
struct at91_pin_group *grp;
int ret;
static u32 grp_index;
u32 i = 0;
dev_dbg(info->dev, "parse function(%d): %pOFn\n", index, np);
func = &info->functions[index];
/* Initialise function */
func->name = np->name;
func->ngroups = of_get_child_count(np);
if (func->ngroups == 0) {
dev_err(info->dev, "no groups defined\n");
return -EINVAL;
}
func->groups = devm_kcalloc(info->dev,
func->ngroups, sizeof(char *), GFP_KERNEL);
if (!func->groups)
return -ENOMEM;
for_each_child_of_node(np, child) {
func->groups[i] = child->name;
grp = &info->groups[grp_index++];
ret = at91_pinctrl_parse_groups(child, grp, info, i++);
if (ret) {
of_node_put(child);
return ret;
}
}
return 0;
}
static const struct of_device_id at91_pinctrl_of_match[] = {
{ .compatible = "atmel,sama5d3-pinctrl", .data = &sama5d3_ops },
{ .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
{ .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
{ .compatible = "microchip,sam9x60-pinctrl", .data = &sam9x60_ops },
{ /* sentinel */ }
};
static int at91_pinctrl_probe_dt(struct platform_device *pdev,
struct at91_pinctrl *info)
{
int ret = 0;
int i, j;
uint32_t *tmp;
struct device_node *np = pdev->dev.of_node;
struct device_node *child;
if (!np)
return -ENODEV;
info->dev = &pdev->dev;
info->ops = (const struct at91_pinctrl_mux_ops *)
of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
at91_pinctrl_child_count(info, np);
if (gpio_banks < 1) {
dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
return -EINVAL;
}
ret = at91_pinctrl_mux_mask(info, np);
if (ret)
return ret;
dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
dev_dbg(&pdev->dev, "mux-mask\n");
tmp = info->mux_mask;
for (i = 0; i < gpio_banks; i++) {
for (j = 0; j < info->nmux; j++, tmp++) {
dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
}
}
dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
info->functions = devm_kcalloc(&pdev->dev,
info->nfunctions,
sizeof(struct at91_pmx_func),
GFP_KERNEL);
if (!info->functions)
return -ENOMEM;
info->groups = devm_kcalloc(&pdev->dev,
info->ngroups,
sizeof(struct at91_pin_group),
GFP_KERNEL);
if (!info->groups)
return -ENOMEM;
dev_dbg(&pdev->dev, "nbanks = %d\n", gpio_banks);
dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
i = 0;
for_each_child_of_node(np, child) {
if (of_device_is_compatible(child, gpio_compat))
continue;
ret = at91_pinctrl_parse_functions(child, info, i++);
if (ret) {
dev_err(&pdev->dev, "failed to parse function\n");
of_node_put(child);
return ret;
}
}
return 0;
}
static int at91_pinctrl_probe(struct platform_device *pdev)
{
struct at91_pinctrl *info;
struct pinctrl_pin_desc *pdesc;
int ret, i, j, k, ngpio_chips_enabled = 0;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ret = at91_pinctrl_probe_dt(pdev, info);
if (ret)
return ret;
/*
* We need all the GPIO drivers to probe FIRST, or we will not be able
* to obtain references to the struct gpio_chip * for them, and we
* need this to proceed.
*/
for (i = 0; i < gpio_banks; i++)
if (gpio_chips[i])
ngpio_chips_enabled++;
if (ngpio_chips_enabled < info->nactive_banks) {
dev_warn(&pdev->dev,
"All GPIO chips are not registered yet (%d/%d)\n",
ngpio_chips_enabled, info->nactive_banks);
devm_kfree(&pdev->dev, info);
return -EPROBE_DEFER;
}
at91_pinctrl_desc.name = dev_name(&pdev->dev);
at91_pinctrl_desc.npins = gpio_banks * MAX_NB_GPIO_PER_BANK;
at91_pinctrl_desc.pins = pdesc =
devm_kcalloc(&pdev->dev,
at91_pinctrl_desc.npins, sizeof(*pdesc),
GFP_KERNEL);
if (!at91_pinctrl_desc.pins)
return -ENOMEM;
for (i = 0, k = 0; i < gpio_banks; i++) {
for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
pdesc->number = k;
pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
pdesc++;
}
}
platform_set_drvdata(pdev, info);
info->pctl = devm_pinctrl_register(&pdev->dev, &at91_pinctrl_desc,
info);
if (IS_ERR(info->pctl)) {
dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
return PTR_ERR(info->pctl);
}
/* We will handle a range of GPIO pins */
for (i = 0; i < gpio_banks; i++)
if (gpio_chips[i])
pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
return 0;
}
static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
u32 osr;
osr = readl_relaxed(pio + PIO_OSR);
if (osr & mask)
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
writel_relaxed(mask, pio + PIO_ODR);
return 0;
}
static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
u32 pdsr;
pdsr = readl_relaxed(pio + PIO_PDSR);
return (pdsr & mask) != 0;
}
static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
int val)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
}
static void at91_gpio_set_multiple(struct gpio_chip *chip,
unsigned long *mask, unsigned long *bits)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
#define BITS_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
/* Mask additionally to ngpio as not all GPIO controllers have 32 pins */
uint32_t set_mask = (*mask & *bits) & BITS_MASK(chip->ngpio);
uint32_t clear_mask = (*mask & ~(*bits)) & BITS_MASK(chip->ngpio);
writel_relaxed(set_mask, pio + PIO_SODR);
writel_relaxed(clear_mask, pio + PIO_CODR);
}
static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int val)
{
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
writel_relaxed(mask, pio + PIO_OER);
return 0;
}
#ifdef CONFIG_DEBUG_FS
static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
enum at91_mux mode;
int i;
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
void __iomem *pio = at91_gpio->regbase;
const char *gpio_label;
for_each_requested_gpio(chip, i, gpio_label) {
unsigned mask = pin_to_mask(i);
mode = at91_gpio->ops->get_periph(pio, mask);
seq_printf(s, "[%s] GPIO%s%d: ",
gpio_label, chip->label, i);
if (mode == AT91_MUX_GPIO) {
seq_printf(s, "[gpio] ");
seq_printf(s, "%s ",
readl_relaxed(pio + PIO_OSR) & mask ?
"output" : "input");
seq_printf(s, "%s\n",
readl_relaxed(pio + PIO_PDSR) & mask ?
"set" : "clear");
} else {
seq_printf(s, "[periph %c]\n",
mode + 'A' - 1);
}
}
}
#else
#define at91_gpio_dbg_show NULL
#endif
/* Several AIC controller irqs are dispatched through this GPIO handler.
* To use any AT91_PIN_* as an externally triggered IRQ, first call
* at91_set_gpio_input() then maybe enable its glitch filter.
* Then just request_irq() with the pin ID; it works like any ARM IRQ
* handler.
* First implementation always triggers on rising and falling edges
* whereas the newer PIO3 can be additionally configured to trigger on
* level, edge with any polarity.
*
* Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
* configuring them with at91_set_a_periph() or at91_set_b_periph().
* IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
*/
static void gpio_irq_mask(struct irq_data *d)
{
struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << d->hwirq;
if (pio)
writel_relaxed(mask, pio + PIO_IDR);
}
static void gpio_irq_unmask(struct irq_data *d)
{
struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << d->hwirq;
if (pio)
writel_relaxed(mask, pio + PIO_IER);
}
static int gpio_irq_type(struct irq_data *d, unsigned type)
{
switch (type) {
case IRQ_TYPE_NONE:
case IRQ_TYPE_EDGE_BOTH:
return 0;
default:
return -EINVAL;
}
}
/* Alternate irq type for PIO3 support */
static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
{
struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << d->hwirq;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
irq_set_handler_locked(d, handle_simple_irq);
writel_relaxed(mask, pio + PIO_ESR);
writel_relaxed(mask, pio + PIO_REHLSR);
break;
case IRQ_TYPE_EDGE_FALLING:
irq_set_handler_locked(d, handle_simple_irq);
writel_relaxed(mask, pio + PIO_ESR);
writel_relaxed(mask, pio + PIO_FELLSR);
break;
case IRQ_TYPE_LEVEL_LOW:
irq_set_handler_locked(d, handle_level_irq);
writel_relaxed(mask, pio + PIO_LSR);
writel_relaxed(mask, pio + PIO_FELLSR);
break;
case IRQ_TYPE_LEVEL_HIGH:
irq_set_handler_locked(d, handle_level_irq);
writel_relaxed(mask, pio + PIO_LSR);
writel_relaxed(mask, pio + PIO_REHLSR);
break;
case IRQ_TYPE_EDGE_BOTH:
/*
* disable additional interrupt modes:
* fall back to default behavior
*/
irq_set_handler_locked(d, handle_simple_irq);
writel_relaxed(mask, pio + PIO_AIMDR);
return 0;
case IRQ_TYPE_NONE:
default:
pr_warn("AT91: No type for GPIO irq offset %d\n", d->irq);
return -EINVAL;
}
/* enable additional interrupt modes */
writel_relaxed(mask, pio + PIO_AIMER);
return 0;
}
static void gpio_irq_ack(struct irq_data *d)
{
/* the interrupt is already cleared before by reading ISR */
}
#ifdef CONFIG_PM
static u32 wakeups[MAX_GPIO_BANKS];
static u32 backups[MAX_GPIO_BANKS];
static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
{
struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
unsigned bank = at91_gpio->pioc_idx;
unsigned mask = 1 << d->hwirq;
if (unlikely(bank >= MAX_GPIO_BANKS))
return -EINVAL;
if (state)
wakeups[bank] |= mask;
else
wakeups[bank] &= ~mask;
irq_set_irq_wake(at91_gpio->pioc_virq, state);
return 0;
}
void at91_pinctrl_gpio_suspend(void)
{
int i;
for (i = 0; i < gpio_banks; i++) {
void __iomem *pio;
if (!gpio_chips[i])
continue;
pio = gpio_chips[i]->regbase;
backups[i] = readl_relaxed(pio + PIO_IMR);
writel_relaxed(backups[i], pio + PIO_IDR);
writel_relaxed(wakeups[i], pio + PIO_IER);
if (!wakeups[i])
clk_disable_unprepare(gpio_chips[i]->clock);
else
printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
'A'+i, wakeups[i]);
}
}
void at91_pinctrl_gpio_resume(void)
{
int i;
for (i = 0; i < gpio_banks; i++) {
void __iomem *pio;
if (!gpio_chips[i])
continue;
pio = gpio_chips[i]->regbase;
if (!wakeups[i])
clk_prepare_enable(gpio_chips[i]->clock);
writel_relaxed(wakeups[i], pio + PIO_IDR);
writel_relaxed(backups[i], pio + PIO_IER);
}
}
#else
#define gpio_irq_set_wake NULL
#endif /* CONFIG_PM */
static void gpio_irq_handler(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct gpio_chip *gpio_chip = irq_desc_get_handler_data(desc);
struct at91_gpio_chip *at91_gpio = gpiochip_get_data(gpio_chip);
void __iomem *pio = at91_gpio->regbase;
unsigned long isr;
int n;
chained_irq_enter(chip, desc);
for (;;) {
/* Reading ISR acks pending (edge triggered) GPIO interrupts.
* When there are none pending, we're finished unless we need
* to process multiple banks (like ID_PIOCDE on sam9263).
*/
isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
if (!isr) {
if (!at91_gpio->next)
break;
at91_gpio = at91_gpio->next;
pio = at91_gpio->regbase;
gpio_chip = &at91_gpio->chip;
continue;
}
for_each_set_bit(n, &isr, BITS_PER_LONG)
generic_handle_domain_irq(gpio_chip->irq.domain, n);
}
chained_irq_exit(chip, desc);
/* now it may re-trigger */
}
static int at91_gpio_of_irq_setup(struct platform_device *pdev,
struct at91_gpio_chip *at91_gpio)
{
struct gpio_chip *gpiochip_prev = NULL;
struct at91_gpio_chip *prev = NULL;
struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
struct irq_chip *gpio_irqchip;
struct gpio_irq_chip *girq;
int i;
gpio_irqchip = devm_kzalloc(&pdev->dev, sizeof(*gpio_irqchip),
GFP_KERNEL);
if (!gpio_irqchip)
return -ENOMEM;
at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
gpio_irqchip->name = "GPIO";
gpio_irqchip->irq_ack = gpio_irq_ack;
gpio_irqchip->irq_disable = gpio_irq_mask;
gpio_irqchip->irq_mask = gpio_irq_mask;
gpio_irqchip->irq_unmask = gpio_irq_unmask;
gpio_irqchip->irq_set_wake = gpio_irq_set_wake;
gpio_irqchip->irq_set_type = at91_gpio->ops->irq_type;
/* Disable irqs of this PIO controller */
writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
/*
* Let the generic code handle this edge IRQ, the the chained
* handler will perform the actual work of handling the parent
* interrupt.
*/
girq = &at91_gpio->chip.irq;
girq->chip = gpio_irqchip;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_edge_irq;
/*
* The top level handler handles one bank of GPIOs, except
* on some SoC it can handle up to three...
* We only set up the handler for the first of the list.
*/
gpiochip_prev = irq_get_handler_data(at91_gpio->pioc_virq);
if (!gpiochip_prev) {
girq->parent_handler = gpio_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(&pdev->dev, 1,
sizeof(*girq->parents),
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
girq->parents[0] = at91_gpio->pioc_virq;
return 0;
}
prev = gpiochip_get_data(gpiochip_prev);
/* we can only have 2 banks before */
for (i = 0; i < 2; i++) {
if (prev->next) {
prev = prev->next;
} else {
prev->next = at91_gpio;
return 0;
}
}
return -EINVAL;
}
/* This structure is replicated for each GPIO block allocated at probe time */
static const struct gpio_chip at91_gpio_template = {
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get_direction = at91_gpio_get_direction,
.direction_input = at91_gpio_direction_input,
.get = at91_gpio_get,
.direction_output = at91_gpio_direction_output,
.set = at91_gpio_set,
.set_multiple = at91_gpio_set_multiple,
.dbg_show = at91_gpio_dbg_show,
.can_sleep = false,
.ngpio = MAX_NB_GPIO_PER_BANK,
};
static const struct of_device_id at91_gpio_of_match[] = {
{ .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
{ .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
{ .compatible = "microchip,sam9x60-gpio", .data = &sam9x60_ops },
{ /* sentinel */ }
};
static int at91_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct at91_gpio_chip *at91_chip = NULL;
struct gpio_chip *chip;
struct pinctrl_gpio_range *range;
int ret = 0;
int irq, i;
int alias_idx = of_alias_get_id(np, "gpio");
uint32_t ngpio;
char **names;
BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
if (gpio_chips[alias_idx]) {
ret = -EBUSY;
goto err;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = irq;
goto err;
}
at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
if (!at91_chip) {
ret = -ENOMEM;
goto err;
}
at91_chip->regbase = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(at91_chip->regbase)) {
ret = PTR_ERR(at91_chip->regbase);
goto err;
}
at91_chip->ops = (const struct at91_pinctrl_mux_ops *)
of_match_device(at91_gpio_of_match, &pdev->dev)->data;
at91_chip->pioc_virq = irq;
at91_chip->pioc_idx = alias_idx;
at91_chip->clock = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(at91_chip->clock)) {
dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
ret = PTR_ERR(at91_chip->clock);
goto err;
}
ret = clk_prepare_enable(at91_chip->clock);
if (ret) {
dev_err(&pdev->dev, "failed to prepare and enable clock, ignoring.\n");
goto clk_enable_err;
}
at91_chip->chip = at91_gpio_template;
chip = &at91_chip->chip;
chip->label = dev_name(&pdev->dev);
chip->parent = &pdev->dev;
chip->owner = THIS_MODULE;
chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
if (ngpio >= MAX_NB_GPIO_PER_BANK)
pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
else
chip->ngpio = ngpio;
}
names = devm_kcalloc(&pdev->dev, chip->ngpio, sizeof(char *),
GFP_KERNEL);
if (!names) {
ret = -ENOMEM;
goto clk_enable_err;
}
for (i = 0; i < chip->ngpio; i++)
names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
chip->names = (const char *const *)names;
range = &at91_chip->range;
range->name = chip->label;
range->id = alias_idx;
range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
range->npins = chip->ngpio;
range->gc = chip;
ret = at91_gpio_of_irq_setup(pdev, at91_chip);
if (ret)
goto gpiochip_add_err;
ret = gpiochip_add_data(chip, at91_chip);
if (ret)
goto gpiochip_add_err;
gpio_chips[alias_idx] = at91_chip;
gpio_banks = max(gpio_banks, alias_idx + 1);
dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
return 0;
gpiochip_add_err:
clk_enable_err:
clk_disable_unprepare(at91_chip->clock);
err:
dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
return ret;
}
static struct platform_driver at91_gpio_driver = {
.driver = {
.name = "gpio-at91",
.of_match_table = at91_gpio_of_match,
},
.probe = at91_gpio_probe,
};
static struct platform_driver at91_pinctrl_driver = {
.driver = {
.name = "pinctrl-at91",
.of_match_table = at91_pinctrl_of_match,
},
.probe = at91_pinctrl_probe,
};
static struct platform_driver * const drivers[] = {
&at91_gpio_driver,
&at91_pinctrl_driver,
};
static int __init at91_pinctrl_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
arch_initcall(at91_pinctrl_init);