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u-boot/drivers/pinctrl/pinctrl-at91.c
Wenyou Yang 9319a756ff pinctrl: at91: add pinctrl driver 
AT91 PIO controller is a combined gpio-controller, pin-mux and
pin-config module. The peripheral's pins are assigned through
per-pin based muxing logic.

Each SoC will have to describe the its limitation and pin
configuration via device tree. This will allow to do not need
to touch the C code when adding new SoC if the IP version is
supported.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-04-13 14:44:50 -06:00

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/*
* Atmel PIO pinctrl driver
*
* Copyright (C) 2016 Atmel Corporation
* Wenyou.Yang <wenyou.yang@atmel.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm/device.h>
#include <dm/pinctrl.h>
#include <linux/io.h>
#include <linux/err.h>
#include <mach/at91_pio.h>
DECLARE_GLOBAL_DATA_PTR;
#define MAX_GPIO_BANKS 5
#define MAX_NB_GPIO_PER_BANK 32
#define MAX_PINMUX_ENTRIES 200
struct at91_pinctrl_priv {
struct at91_port *reg_base[MAX_GPIO_BANKS];
u32 nbanks;
};
#define PULL_UP BIT(0)
#define MULTI_DRIVE BIT(1)
#define DEGLITCH BIT(2)
#define PULL_DOWN BIT(3)
#define DIS_SCHMIT BIT(4)
#define DRIVE_STRENGTH_SHIFT 5
#define DRIVE_STRENGTH_MASK 0x3
#define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
#define OUTPUT BIT(7)
#define OUTPUT_VAL_SHIFT 8
#define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT)
#define DEBOUNCE BIT(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)
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_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 callbacks
* if not present means the IP does not support it
* @mux_A_periph: assign the corresponding pin to the peripheral A function.
* @mux_B_periph: assign the corresponding pin to the peripheral B function.
* @mux_C_periph: assign the corresponding pin to the peripheral C function.
* @mux_D_periph: assign the corresponding pin to the peripheral D function.
* @set_deglitch: enable/disable the deglitch feature.
* @set_debounce: enable/disable the debounce feature.
* @set_pulldown: enable/disable the pulldown feature.
* @disable_schmitt_trig: disable schmitt trigger
*/
struct at91_pinctrl_mux_ops {
void (*mux_A_periph)(struct at91_port *pio, u32 mask);
void (*mux_B_periph)(struct at91_port *pio, u32 mask);
void (*mux_C_periph)(struct at91_port *pio, u32 mask);
void (*mux_D_periph)(struct at91_port *pio, u32 mask);
void (*set_deglitch)(struct at91_port *pio, u32 mask, bool is_on);
void (*set_debounce)(struct at91_port *pio, u32 mask, bool is_on,
u32 div);
void (*set_pulldown)(struct at91_port *pio, u32 mask, bool is_on);
void (*disable_schmitt_trig)(struct at91_port *pio, u32 mask);
void (*set_drivestrength)(struct at91_port *pio, u32 pin,
u32 strength);
};
static u32 two_bit_pin_value_shift_amount(u32 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 void at91_mux_disable_interrupt(struct at91_port *pio, u32 mask)
{
writel(mask, &pio->idr);
}
static void at91_mux_set_pullup(struct at91_port *pio, u32 mask, bool on)
{
if (on)
writel(mask, &pio->mux.pio3.ppddr);
writel(mask, (on ? &pio->puer : &pio->pudr));
}
static void at91_mux_set_output(struct at91_port *pio, unsigned mask,
bool is_on, bool val)
{
writel(mask, (val ? &pio->sodr : &pio->codr));
writel(mask, (is_on ? &pio->oer : &pio->odr));
}
static void at91_mux_set_multidrive(struct at91_port *pio, u32 mask, bool on)
{
writel(mask, (on ? &pio->mder : &pio->mddr));
}
static void at91_mux_set_A_periph(struct at91_port *pio, u32 mask)
{
writel(mask, &pio->mux.pio2.asr);
}
static void at91_mux_set_B_periph(struct at91_port *pio, u32 mask)
{
writel(mask, &pio->mux.pio2.bsr);
}
static void at91_mux_pio3_set_A_periph(struct at91_port *pio, u32 mask)
{
writel(readl(&pio->mux.pio3.abcdsr1) & ~mask, &pio->mux.pio3.abcdsr1);
writel(readl(&pio->mux.pio3.abcdsr2) & ~mask, &pio->mux.pio3.abcdsr2);
}
static void at91_mux_pio3_set_B_periph(struct at91_port *pio, u32 mask)
{
writel(readl(&pio->mux.pio3.abcdsr1) | mask, &pio->mux.pio3.abcdsr1);
writel(readl(&pio->mux.pio3.abcdsr2) & ~mask, &pio->mux.pio3.abcdsr2);
}
static void at91_mux_pio3_set_C_periph(struct at91_port *pio, u32 mask)
{
writel(readl(&pio->mux.pio3.abcdsr1) & ~mask, &pio->mux.pio3.abcdsr1);
writel(readl(&pio->mux.pio3.abcdsr2) | mask, &pio->mux.pio3.abcdsr2);
}
static void at91_mux_pio3_set_D_periph(struct at91_port *pio, u32 mask)
{
writel(readl(&pio->mux.pio3.abcdsr1) | mask, &pio->mux.pio3.abcdsr1);
writel(readl(&pio->mux.pio3.abcdsr2) | mask, &pio->mux.pio3.abcdsr2);
}
static void at91_mux_set_deglitch(struct at91_port *pio, u32 mask, bool is_on)
{
writel(mask, (is_on ? &pio->ifer : &pio->ifdr));
}
static void at91_mux_pio3_set_deglitch(struct at91_port *pio,
u32 mask, bool is_on)
{
if (is_on)
writel(mask, &pio->mux.pio3.ifscdr);
at91_mux_set_deglitch(pio, mask, is_on);
}
static void at91_mux_pio3_set_debounce(struct at91_port *pio, u32 mask,
bool is_on, u32 div)
{
if (is_on) {
writel(mask, &pio->mux.pio3.ifscer);
writel(div & PIO_SCDR_DIV, &pio->mux.pio3.scdr);
writel(mask, &pio->ifer);
} else {
writel(mask, &pio->mux.pio3.ifscdr);
}
}
static void at91_mux_pio3_set_pulldown(struct at91_port *pio,
u32 mask, bool is_on)
{
if (is_on)
writel(mask, &pio->pudr);
writel(mask, (is_on ? &pio->mux.pio3.ppder : &pio->mux.pio3.ppddr));
}
static void at91_mux_pio3_disable_schmitt_trig(struct at91_port *pio,
u32 mask)
{
writel(readl(&pio->schmitt) | mask, &pio->schmitt);
}
static void set_drive_strength(void *reg, u32 pin, u32 strength)
{
u32 shift = two_bit_pin_value_shift_amount(pin);
clrsetbits_le32(reg, DRIVE_STRENGTH_MASK << shift, strength << shift);
}
static void at91_mux_sama5d3_set_drivestrength(struct at91_port *pio,
u32 pin, u32 setting)
{
void *reg;
reg = &pio->driver12;
if (pin >= MAX_NB_GPIO_PER_BANK / 2)
reg = &pio->driver2;
/* do nothing if setting is zero */
if (!setting)
return;
/* strength is 1 to 1 with setting for SAMA5 */
set_drive_strength(reg, pin, setting);
}
static void at91_mux_sam9x5_set_drivestrength(struct at91_port *pio,
u32 pin, u32 setting)
{
void *reg;
reg = &pio->driver1;
if (pin >= MAX_NB_GPIO_PER_BANK / 2)
reg = &pio->driver12;
/* 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(reg, pin, setting);
}
static struct at91_pinctrl_mux_ops at91rm9200_ops = {
.mux_A_periph = at91_mux_set_A_periph,
.mux_B_periph = at91_mux_set_B_periph,
.set_deglitch = at91_mux_set_deglitch,
};
static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
.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,
.set_deglitch = at91_mux_pio3_set_deglitch,
.set_debounce = at91_mux_pio3_set_debounce,
.set_pulldown = at91_mux_pio3_set_pulldown,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.set_drivestrength = at91_mux_sam9x5_set_drivestrength,
};
static struct at91_pinctrl_mux_ops sama5d3_ops = {
.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,
.set_deglitch = at91_mux_pio3_set_deglitch,
.set_debounce = at91_mux_pio3_set_debounce,
.set_pulldown = at91_mux_pio3_set_pulldown,
.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
.set_drivestrength = at91_mux_sama5d3_set_drivestrength,
};
static void at91_mux_gpio_disable(struct at91_port *pio, u32 mask)
{
writel(mask, &pio->pdr);
}
static void at91_mux_gpio_enable(struct at91_port *pio, u32 mask, bool input)
{
writel(mask, &pio->per);
writel(mask, (input ? &pio->odr : &pio->oer));
}
static int at91_pmx_set(struct at91_pinctrl_mux_ops *ops,
struct at91_port *pio, u32 mask, enum at91_mux mux)
{
at91_mux_disable_interrupt(pio, mask);
switch (mux) {
case AT91_MUX_GPIO:
at91_mux_gpio_enable(pio, mask, 1);
break;
case AT91_MUX_PERIPH_A:
ops->mux_A_periph(pio, mask);
break;
case AT91_MUX_PERIPH_B:
ops->mux_B_periph(pio, mask);
break;
case AT91_MUX_PERIPH_C:
if (!ops->mux_C_periph)
return -EINVAL;
ops->mux_C_periph(pio, mask);
break;
case AT91_MUX_PERIPH_D:
if (!ops->mux_D_periph)
return -EINVAL;
ops->mux_D_periph(pio, mask);
break;
}
if (mux)
at91_mux_gpio_disable(pio, mask);
return 0;
}
static int at91_pinconf_set(struct at91_pinctrl_mux_ops *ops,
struct at91_port *pio, u32 pin, u32 config)
{
u32 mask = BIT(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 (ops->set_deglitch)
ops->set_deglitch(pio, mask, config & DEGLITCH);
if (ops->set_debounce)
ops->set_debounce(pio, mask, config & DEBOUNCE,
(config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
if (ops->set_pulldown)
ops->set_pulldown(pio, mask, config & PULL_DOWN);
if (ops->disable_schmitt_trig && config & DIS_SCHMIT)
ops->disable_schmitt_trig(pio, mask);
if (ops->set_drivestrength)
ops->set_drivestrength(pio, pin,
(config & DRIVE_STRENGTH) >> DRIVE_STRENGTH_SHIFT);
return 0;
}
static int at91_pin_check_config(struct udevice *dev, u32 bank, u32 pin)
{
struct at91_pinctrl_priv *priv = dev_get_priv(dev);
if (bank >= priv->nbanks) {
debug("pin conf bank %d >= nbanks %d\n", bank, priv->nbanks);
return -EINVAL;
}
if (pin >= MAX_NB_GPIO_PER_BANK) {
debug("pin conf pin %d >= %d\n", pin, MAX_NB_GPIO_PER_BANK);
return -EINVAL;
}
return 0;
}
static int at91_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
struct at91_pinctrl_priv *priv = dev_get_priv(dev);
const void *blob = gd->fdt_blob;
int node = config->of_offset;
u32 cells[MAX_PINMUX_ENTRIES];
const u32 *list = cells;
u32 bank, pin;
u32 conf, mask, count, i;
int size;
int ret;
enum at91_mux mux;
struct at91_port *pio;
struct at91_pinctrl_mux_ops *ops =
(struct at91_pinctrl_mux_ops *)dev_get_driver_data(dev);
/*
* the binding format is atmel,pins = <bank pin mux CONFIG ...>,
* do sanity check and calculate pins number
*/
size = fdtdec_get_int_array_count(blob, node, "atmel,pins",
cells, ARRAY_SIZE(cells));
/* we do not check return since it's safe node passed down */
count = size >> 2;
if (!count)
return -EINVAL;
for (i = 0; i < count; i++) {
bank = *list++;
pin = *list++;
mux = *list++;
conf = *list++;
ret = at91_pin_check_config(dev, bank, pin);
if (ret)
return ret;
pio = priv->reg_base[bank];
mask = BIT(pin);
ret = at91_pmx_set(ops, pio, mask, mux);
if (ret)
return ret;
ret = at91_pinconf_set(ops, pio, pin, conf);
if (ret)
return ret;
}
return 0;
}
const struct pinctrl_ops at91_pinctrl_ops = {
.set_state = at91_pinctrl_set_state,
};
static int at91_pinctrl_probe(struct udevice *dev)
{
struct at91_pinctrl_priv *priv = dev_get_priv(dev);
fdt_addr_t addr_base;
int index;
for (index = 0; index < MAX_GPIO_BANKS; index++) {
addr_base = dev_get_addr_index(dev, index);
if (addr_base == FDT_ADDR_T_NONE)
break;
priv->reg_base[index] = (struct at91_port *)addr_base;
}
priv->nbanks = index;
return 0;
}
static const struct udevice_id at91_pinctrl_match[] = {
{ .compatible = "atmel,sama5d3-pinctrl", .data = (ulong)&sama5d3_ops },
{ .compatible = "atmel,at91sam9x5-pinctrl", .data = (ulong)&at91sam9x5_ops },
{ .compatible = "atmel,at91rm9200-pinctrl", .data = (ulong)&at91rm9200_ops },
{}
};
U_BOOT_DRIVER(at91_pinctrl) = {
.name = "pinctrl_at91",
.id = UCLASS_PINCTRL,
.of_match = at91_pinctrl_match,
.probe = at91_pinctrl_probe,
.priv_auto_alloc_size = sizeof(struct at91_pinctrl_priv),
.ops = &at91_pinctrl_ops,
};
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