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linux-sg2042/drivers/pinctrl/pinctrl-at91.c

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/*
* at91 pinctrl driver based on at91 pinmux core
*
* Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* Under GPLv2 only
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.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.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 "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 */
struct at91_pinctrl_mux_ops *ops; /* ops */
};
#define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
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 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.
*/
#define DRIVE_STRENGTH_DEFAULT (0 << DRIVE_STRENGTH_SHIFT)
#define DRIVE_STRENGTH_LOW (1 << DRIVE_STRENGTH_SHIFT)
#define DRIVE_STRENGTH_MED (2 << DRIVE_STRENGTH_SHIFT)
#define DRIVE_STRENGTH_HI (3 << DRIVE_STRENGTH_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
* @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);
/* 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;
struct at91_pinctrl_mux_ops *ops;
};
static const inline 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 %s\n",
np->name);
return -EINVAL;
}
map_num += grp->npins;
new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, 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 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_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_HI - tmp;
return tmp;
}
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_HI - setting;
set_drive_strength(pio + at91sam9x5_get_drive_register(pin), pin,
setting);
}
static 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 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 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 = container_of(chip, struct at91_gpio_chip, 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;
*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);
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_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);
} /* 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) do { \
if ((config & mask) == flag) { \
if (num_conf) \
seq_puts(s, "|"); \
seq_puts(s, #flag); \
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_LOW);
DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_MED);
DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_HI);
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_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
if (!info->mux_mask) {
dev_err(info->dev, "could not alloc mux_mask\n");
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): %s\n", index, np->name);
/* 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_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
GFP_KERNEL);
grp->pins = devm_kzalloc(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): %s\n", index, np->name);
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_kzalloc(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)
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 },
{ /* 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 = (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_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
GFP_KERNEL);
if (!info->functions)
return -ENOMEM;
info->groups = devm_kzalloc(&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");
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_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, 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 = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, 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_pinctrl_remove(struct platform_device *pdev)
{
struct at91_pinctrl *info = platform_get_drvdata(pdev);
pinctrl_unregister(info->pctl);
return 0;
}
static int at91_gpio_request(struct gpio_chip *chip, unsigned offset)
{
/*
* Map back to global GPIO space and request muxing, the direction
* parameter does not matter for this controller.
*/
int gpio = chip->base + offset;
int bank = chip->base / chip->ngpio;
dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__,
'A' + bank, offset, gpio);
return pinctrl_request_gpio(gpio);
}
static void at91_gpio_free(struct gpio_chip *chip, unsigned offset)
{
int gpio = chip->base + offset;
pinctrl_free_gpio(gpio);
}
static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
void __iomem *pio = at91_gpio->regbase;
unsigned mask = 1 << offset;
u32 osr;
osr = readl_relaxed(pio + PIO_OSR);
return !(osr & mask);
}
static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(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 = to_at91_gpio_chip(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 = to_at91_gpio_chip(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 = to_at91_gpio_chip(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 = to_at91_gpio_chip(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 = to_at91_gpio_chip(chip);
void __iomem *pio = at91_gpio->regbase;
for (i = 0; i < chip->ngpio; i++) {
unsigned mask = pin_to_mask(i);
const char *gpio_label;
gpio_label = gpiochip_is_requested(chip, i);
if (!gpio_label)
continue;
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 irq %d\n", gpio_to_irq(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 struct irq_chip gpio_irqchip = {
.name = "GPIO",
.irq_ack = gpio_irq_ack,
.irq_disable = gpio_irq_mask,
.irq_mask = gpio_irq_mask,
.irq_unmask = gpio_irq_unmask,
/* .irq_set_type is set dynamically */
.irq_set_wake = gpio_irq_set_wake,
};
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 = container_of(gpio_chip,
struct at91_gpio_chip, 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_irq(irq_find_mapping(
gpio_chip->irqdomain, 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);
int ret, i;
at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
/* Setup proper .irq_set_type function */
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.
*/
ret = gpiochip_irqchip_add(&at91_gpio->chip,
&gpio_irqchip,
0,
handle_edge_irq,
IRQ_TYPE_EDGE_BOTH);
if (ret) {
dev_err(&pdev->dev, "at91_gpio.%d: Couldn't add irqchip to gpiochip.\n",
at91_gpio->pioc_idx);
return ret;
}
/* 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) {
/* Then register the chain on the parent IRQ */
gpiochip_set_chained_irqchip(&at91_gpio->chip,
&gpio_irqchip,
at91_gpio->pioc_virq,
gpio_irq_handler);
return 0;
}
prev = container_of(gpiochip_prev, struct at91_gpio_chip, chip);
/* 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 struct gpio_chip at91_gpio_template = {
.request = at91_gpio_request,
.free = at91_gpio_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 },
{ /* sentinel */ }
};
static int at91_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct resource *res;
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;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(at91_chip->regbase)) {
ret = PTR_ERR(at91_chip->regbase);
goto err;
}
at91_chip->ops = (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(at91_chip->clock);
if (ret)
goto clk_prepare_err;
/* enable PIO controller's clock */
ret = clk_enable(at91_chip->clock);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
goto clk_enable_err;
}
at91_chip->chip = at91_gpio_template;
chip = &at91_chip->chip;
chip->of_node = np;
chip->label = dev_name(&pdev->dev);
chip->dev = &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_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
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 = gpiochip_add(chip);
if (ret)
goto gpiochip_add_err;
gpio_chips[alias_idx] = at91_chip;
gpio_banks = max(gpio_banks, alias_idx + 1);
ret = at91_gpio_of_irq_setup(pdev, at91_chip);
if (ret)
goto irq_setup_err;
dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
return 0;
irq_setup_err:
gpiochip_remove(chip);
gpiochip_add_err:
clk_disable(at91_chip->clock);
clk_enable_err:
clk_unprepare(at91_chip->clock);
clk_prepare_err:
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,
.remove = at91_pinctrl_remove,
};
static int __init at91_pinctrl_init(void)
{
int ret;
ret = platform_driver_register(&at91_gpio_driver);
if (ret)
return ret;
return platform_driver_register(&at91_pinctrl_driver);
}
arch_initcall(at91_pinctrl_init);
static void __exit at91_pinctrl_exit(void)
{
platform_driver_unregister(&at91_pinctrl_driver);
}
module_exit(at91_pinctrl_exit);
MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
MODULE_LICENSE("GPL v2");
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