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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Marvell 88E6xxx Switch Global 2 Scratch & Misc Registers support
*
* Copyright (c) 2008 Marvell Semiconductor
*
* Copyright (c) 2017 National Instruments
* Brandon Streiff <brandon.streiff@ni.com>
*/
#include "chip.h"
#include "global2.h"
/* Offset 0x1A: Scratch and Misc. Register */
static int mv88e6xxx_g2_scratch_read(struct mv88e6xxx_chip *chip, int reg,
u8 *data)
{
u16 value;
int err;
err = mv88e6xxx_g2_write(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC,
reg << 8);
if (err)
return err;
err = mv88e6xxx_g2_read(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC, &value);
if (err)
return err;
*data = (value & MV88E6XXX_G2_SCRATCH_MISC_DATA_MASK);
return 0;
}
static int mv88e6xxx_g2_scratch_write(struct mv88e6xxx_chip *chip, int reg,
u8 data)
{
u16 value = (reg << 8) | data;
return mv88e6xxx_g2_write(chip, MV88E6XXX_G2_SCRATCH_MISC_MISC,
MV88E6XXX_G2_SCRATCH_MISC_UPDATE | value);
}
/**
* mv88e6xxx_g2_scratch_gpio_get_bit - get a bit
* @chip: chip private data
* @nr: bit index
* @set: is bit set?
*/
static int mv88e6xxx_g2_scratch_get_bit(struct mv88e6xxx_chip *chip,
int base_reg, unsigned int offset,
int *set)
{
int reg = base_reg + (offset / 8);
u8 mask = (1 << (offset & 0x7));
u8 val;
int err;
err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
if (err)
return err;
*set = !!(mask & val);
return 0;
}
/**
* mv88e6xxx_g2_scratch_gpio_set_bit - set (or clear) a bit
* @chip: chip private data
* @nr: bit index
* @set: set if true, clear if false
*
* Helper function for dealing with the direction and data registers.
*/
static int mv88e6xxx_g2_scratch_set_bit(struct mv88e6xxx_chip *chip,
int base_reg, unsigned int offset,
int set)
{
int reg = base_reg + (offset / 8);
u8 mask = (1 << (offset & 0x7));
u8 val;
int err;
err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
if (err)
return err;
if (set)
val |= mask;
else
val &= ~mask;
return mv88e6xxx_g2_scratch_write(chip, reg, val);
}
/**
* mv88e6352_g2_scratch_gpio_get_data - get data on gpio pin
* @chip: chip private data
* @pin: gpio index
*
* Return: 0 for low, 1 for high, negative error
*/
static int mv88e6352_g2_scratch_gpio_get_data(struct mv88e6xxx_chip *chip,
unsigned int pin)
{
int val = 0;
int err;
err = mv88e6xxx_g2_scratch_get_bit(chip,
MV88E6352_G2_SCRATCH_GPIO_DATA0,
pin, &val);
if (err)
return err;
return val;
}
/**
* mv88e6352_g2_scratch_gpio_set_data - set data on gpio pin
* @chip: chip private data
* @pin: gpio index
* @value: value to set
*/
static int mv88e6352_g2_scratch_gpio_set_data(struct mv88e6xxx_chip *chip,
unsigned int pin, int value)
{
u8 mask = (1 << (pin & 0x7));
int offset = (pin / 8);
int reg;
reg = MV88E6352_G2_SCRATCH_GPIO_DATA0 + offset;
if (value)
chip->gpio_data[offset] |= mask;
else
chip->gpio_data[offset] &= ~mask;
return mv88e6xxx_g2_scratch_write(chip, reg, chip->gpio_data[offset]);
}
/**
* mv88e6352_g2_scratch_gpio_get_dir - get direction of gpio pin
* @chip: chip private data
* @pin: gpio index
*
* Return: 0 for output, 1 for input (same as GPIOF_DIR_XXX).
*/
static int mv88e6352_g2_scratch_gpio_get_dir(struct mv88e6xxx_chip *chip,
unsigned int pin)
{
int val = 0;
int err;
err = mv88e6xxx_g2_scratch_get_bit(chip,
MV88E6352_G2_SCRATCH_GPIO_DIR0,
pin, &val);
if (err)
return err;
return val;
}
/**
* mv88e6352_g2_scratch_gpio_set_dir - set direction of gpio pin
* @chip: chip private data
* @pin: gpio index
*/
static int mv88e6352_g2_scratch_gpio_set_dir(struct mv88e6xxx_chip *chip,
unsigned int pin, bool input)
{
int value = (input ? MV88E6352_G2_SCRATCH_GPIO_DIR_IN :
MV88E6352_G2_SCRATCH_GPIO_DIR_OUT);
return mv88e6xxx_g2_scratch_set_bit(chip,
MV88E6352_G2_SCRATCH_GPIO_DIR0,
pin, value);
}
/**
* mv88e6352_g2_scratch_gpio_get_pctl - get pin control setting
* @chip: chip private data
* @pin: gpio index
* @func: function number
*
* Note that the function numbers themselves may vary by chipset.
*/
static int mv88e6352_g2_scratch_gpio_get_pctl(struct mv88e6xxx_chip *chip,
unsigned int pin, int *func)
{
int reg = MV88E6352_G2_SCRATCH_GPIO_PCTL0 + (pin / 2);
int offset = (pin & 0x1) ? 4 : 0;
u8 mask = (0x7 << offset);
int err;
u8 val;
err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
if (err)
return err;
*func = (val & mask) >> offset;
return 0;
}
/**
* mv88e6352_g2_scratch_gpio_set_pctl - set pin control setting
* @chip: chip private data
* @pin: gpio index
* @func: function number
*/
static int mv88e6352_g2_scratch_gpio_set_pctl(struct mv88e6xxx_chip *chip,
unsigned int pin, int func)
{
int reg = MV88E6352_G2_SCRATCH_GPIO_PCTL0 + (pin / 2);
int offset = (pin & 0x1) ? 4 : 0;
u8 mask = (0x7 << offset);
int err;
u8 val;
err = mv88e6xxx_g2_scratch_read(chip, reg, &val);
if (err)
return err;
val = (val & ~mask) | ((func & mask) << offset);
return mv88e6xxx_g2_scratch_write(chip, reg, val);
}
const struct mv88e6xxx_gpio_ops mv88e6352_gpio_ops = {
.get_data = mv88e6352_g2_scratch_gpio_get_data,
.set_data = mv88e6352_g2_scratch_gpio_set_data,
.get_dir = mv88e6352_g2_scratch_gpio_get_dir,
.set_dir = mv88e6352_g2_scratch_gpio_set_dir,
.get_pctl = mv88e6352_g2_scratch_gpio_get_pctl,
.set_pctl = mv88e6352_g2_scratch_gpio_set_pctl,
};
/**
* mv88e6xxx_g2_gpio_set_smi - set gpio muxing for external smi
* @chip: chip private data
* @external: set mux for external smi, or free for gpio usage
*
* Some mv88e6xxx models have GPIO pins that may be configured as
* an external SMI interface, or they may be made free for other
* GPIO uses.
*/
int mv88e6xxx_g2_scratch_gpio_set_smi(struct mv88e6xxx_chip *chip,
bool external)
{
int misc_cfg = MV88E6352_G2_SCRATCH_MISC_CFG;
int config_data1 = MV88E6352_G2_SCRATCH_CONFIG_DATA1;
int config_data2 = MV88E6352_G2_SCRATCH_CONFIG_DATA2;
bool no_cpu;
u8 p0_mode;
int err;
u8 val;
err = mv88e6xxx_g2_scratch_read(chip, config_data2, &val);
if (err)
return err;
p0_mode = val & MV88E6352_G2_SCRATCH_CONFIG_DATA2_P0_MODE_MASK;
if (p0_mode == 0x01 || p0_mode == 0x02)
return -EBUSY;
err = mv88e6xxx_g2_scratch_read(chip, config_data1, &val);
if (err)
return err;
no_cpu = !!(val & MV88E6352_G2_SCRATCH_CONFIG_DATA1_NO_CPU);
err = mv88e6xxx_g2_scratch_read(chip, misc_cfg, &val);
if (err)
return err;
/* NO_CPU being 0 inverts the meaning of the bit */
if (!no_cpu)
external = !external;
if (external)
val |= MV88E6352_G2_SCRATCH_MISC_CFG_NORMALSMI;
else
val &= ~MV88E6352_G2_SCRATCH_MISC_CFG_NORMALSMI;
return mv88e6xxx_g2_scratch_write(chip, misc_cfg, val);
}
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