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u-boot/drivers/pinctrl/pinctrl-at91.c
Walter Lozano addf358bac core: add support for U_BOOT_DRIVER_ALIAS 
Currently when using OF_PLATDATA the binding between devices and drivers
is done trying to match the compatible string in the node with a driver
name. However, usually a single driver supports multiple compatible strings
which causes that only devices which its compatible string matches a
driver name get bound.

To overcome this issue, this patch adds the U_BOOT_DRIVER_ALIAS macro,
which generates no code at all, but allows an easy way to declare driver
name aliases. Thanks to this, dtoc could be improve to look for the driver
name based on its alias when it populates the U_BOOT_DEVICE entry.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-07-09 18:57:22 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Atmel PIO pinctrl driver
*
* Copyright (C) 2016 Atmel Corporation
* Wenyou.Yang <wenyou.yang@atmel.com>
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <dm/pinctrl.h>
#include <asm/hardware.h>
#include <linux/bitops.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 SLEWRATE_SHIFT 9
#define SLEWRATE_MASK 0x1
#define SLEWRATE (SLEWRATE_MASK << SLEWRATE_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.
*/
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_DIS,
SLEWRATE_BIT_ENA,
};
#define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_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);
void (*set_slewrate)(struct at91_port *pio, u32 pin, u32 slewrate);
};
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_BIT_MSK(HI) - setting;
set_drive_strength(reg, pin, setting);
}
static void at91_mux_sam9x60_set_drivestrength(struct at91_port *pio, u32 pin,
u32 setting)
{
void *reg = &pio->driver12;
u32 tmp;
if (setting <= DRIVE_STRENGTH_BIT_DEF ||
setting == DRIVE_STRENGTH_BIT_MED ||
setting > DRIVE_STRENGTH_BIT_HI)
return;
tmp = readl(reg);
/* Strength is 0: low, 1: hi */
if (setting == DRIVE_STRENGTH_BIT_LOW)
tmp &= ~BIT(pin);
else
tmp |= BIT(pin);
writel(tmp, reg);
}
static void at91_mux_sam9x60_set_slewrate(struct at91_port *pio, u32 pin,
u32 setting)
{
void *reg = &pio->reserved12[3];
u32 tmp;
if (setting < SLEWRATE_BIT_DIS || setting > SLEWRATE_BIT_ENA)
return;
tmp = readl(reg);
if (setting == SLEWRATE_BIT_DIS)
tmp &= ~BIT(pin);
else
tmp |= BIT(pin);
writel(tmp, reg);
}
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 struct at91_pinctrl_mux_ops sam9x60_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_sam9x60_set_drivestrength,
.set_slewrate = at91_mux_sam9x60_set_slewrate,
};
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);
if (ops->set_slewrate)
ops->set_slewrate(pio, pin,
(config & SLEWRATE) >> SLEWRATE_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 = dev_of_offset(config);
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 = devfdt_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 },
{ .compatible = "microchip,sam9x60-pinctrl", .data = (ulong)&sam9x60_ops },
{}
};
U_BOOT_DRIVER(atmel_sama5d3_pinctrl) = {
.name = "atmel_sama5d3_pinctrl",
.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,
};
U_BOOT_DRIVER_ALIAS(atmel_sama5d3_pinctrl, atmel_at91rm9200_pinctrl)
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