Release 4.16 drivers/pinctrl/meson/pinctrl-meson-axg-pmx.c
/*
* Second generation of pinmux driver for Amlogic Meson-AXG SoC.
*
* Copyright (c) 2017 Baylibre SAS.
* Author: Jerome Brunet <jbrunet@baylibre.com>
*
* Copyright (c) 2017 Amlogic, Inc. All rights reserved.
* Author: Xingyu Chen <xingyu.chen@amlogic.com>
*
* SPDX-License-Identifier: (GPL-2.0+ or MIT)
*/
/*
* This new generation of pinctrl IP is mainly adopted by the
* Meson-AXG SoC and later series, which use 4-width continuous
* register bit to select the function for each pin.
*
* The value 0 is always selecting the GPIO mode, while other
* values (start from 1) for selecting the function mode.
*/
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include "pinctrl-meson.h"
#include "pinctrl-meson-axg-pmx.h"
static int meson_axg_pmx_get_bank(struct meson_pinctrl *pc,
unsigned int pin,
struct meson_pmx_bank **bank)
{
int i;
struct meson_axg_pmx_data *pmx = pc->data->pmx_data;
for (i = 0; i < pmx->num_pmx_banks; i++)
if (pin >= pmx->pmx_banks[i].first &&
pin <= pmx->pmx_banks[i].last) {
*bank = &pmx->pmx_banks[i];
return 0;
}
return -EINVAL;
}
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static int meson_pmx_calc_reg_and_offset(struct meson_pmx_bank *bank,
unsigned int pin, unsigned int *reg,
unsigned int *offset)
{
int shift;
shift = pin - bank->first;
*reg = bank->reg + (bank->offset + (shift << 2)) / 32;
*offset = (bank->offset + (shift << 2)) % 32;
return 0;
}
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static int meson_axg_pmx_update_function(struct meson_pinctrl *pc,
unsigned int pin, unsigned int func)
{
int ret;
int reg;
int offset;
struct meson_pmx_bank *bank;
ret = meson_axg_pmx_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_pmx_calc_reg_and_offset(bank, pin, ®, &offset);
ret = regmap_update_bits(pc->reg_mux, reg << 2,
0xf << offset, (func & 0xf) << offset);
return ret;
}
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static int meson_axg_pmx_set_mux(struct pinctrl_dev *pcdev,
unsigned int func_num, unsigned int group_num)
{
int i;
int ret;
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
struct meson_pmx_func *func = &pc->data->funcs[func_num];
struct meson_pmx_group *group = &pc->data->groups[group_num];
struct meson_pmx_axg_data *pmx_data =
(struct meson_pmx_axg_data *)group->data;
dev_dbg(pc->dev, "enable function %s, group %s\n", func->name,
group->name);
for (i = 0; i < group->num_pins; i++) {
ret = meson_axg_pmx_update_function(pc, group->pins[i],
pmx_data->func);
if (ret)
return ret;
}
return 0;
}
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static int meson_axg_pmx_request_gpio(struct pinctrl_dev *pcdev,
struct pinctrl_gpio_range *range, unsigned int offset)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return meson_axg_pmx_update_function(pc, offset, 0);
}
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const struct pinmux_ops meson_axg_pmx_ops = {
.set_mux = meson_axg_pmx_set_mux,
.get_functions_count = meson_pmx_get_funcs_count,
.get_function_name = meson_pmx_get_func_name,
.get_function_groups = meson_pmx_get_groups,
.gpio_request_enable = meson_axg_pmx_request_gpio,
};
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