// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for BCM6328 GPIO unit (pinctrl + GPIO)
*
* Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
* Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
*/
#include <linux/bits.h>
#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "../pinctrl-utils.h"
#include "pinctrl-bcm63xx.h"
#define BCM6328_NUM_GPIOS 32
#define BCM6328_MODE_REG 0 x18
#define BCM6328_MUX_HI_REG 0 x1c
#define BCM6328_MUX_LO_REG 0 x20
#define BCM6328_MUX_OTHER_REG 0 x24
#define BCM6328_MUX_MASK GENMASK(1 , 0 )
struct bcm6328_function {
const char *name;
const char * const *groups;
const unsigned num_groups;
unsigned mode_val:1 ;
unsigned mux_val:2 ;
};
static const unsigned int bcm6328_mux[] = {
BCM6328_MUX_LO_REG,
BCM6328_MUX_HI_REG,
BCM6328_MUX_OTHER_REG
};
static const struct pinctrl_pin_desc bcm6328_pins[] = {
PINCTRL_PIN(0 , "gpio0" ),
PINCTRL_PIN(1 , "gpio1" ),
PINCTRL_PIN(2 , "gpio2" ),
PINCTRL_PIN(3 , "gpio3" ),
PINCTRL_PIN(4 , "gpio4" ),
PINCTRL_PIN(5 , "gpio5" ),
PINCTRL_PIN(6 , "gpio6" ),
PINCTRL_PIN(7 , "gpio7" ),
PINCTRL_PIN(8 , "gpio8" ),
PINCTRL_PIN(9 , "gpio9" ),
PINCTRL_PIN(10 , "gpio10" ),
PINCTRL_PIN(11 , "gpio11" ),
PINCTRL_PIN(12 , "gpio12" ),
PINCTRL_PIN(13 , "gpio13" ),
PINCTRL_PIN(14 , "gpio14" ),
PINCTRL_PIN(15 , "gpio15" ),
PINCTRL_PIN(16 , "gpio16" ),
PINCTRL_PIN(17 , "gpio17" ),
PINCTRL_PIN(18 , "gpio18" ),
PINCTRL_PIN(19 , "gpio19" ),
PINCTRL_PIN(20 , "gpio20" ),
PINCTRL_PIN(21 , "gpio21" ),
PINCTRL_PIN(22 , "gpio22" ),
PINCTRL_PIN(23 , "gpio23" ),
PINCTRL_PIN(24 , "gpio24" ),
PINCTRL_PIN(25 , "gpio25" ),
PINCTRL_PIN(26 , "gpio26" ),
PINCTRL_PIN(27 , "gpio27" ),
PINCTRL_PIN(28 , "gpio28" ),
PINCTRL_PIN(29 , "gpio29" ),
PINCTRL_PIN(30 , "gpio30" ),
PINCTRL_PIN(31 , "gpio31" ),
/*
* No idea where they really are; so let's put them according
* to their mux offsets.
*/
PINCTRL_PIN(36 , "hsspi_cs1" ),
PINCTRL_PIN(38 , "usb_p2" ),
};
static unsigned gpio0_pins[] = { 0 };
static unsigned gpio1_pins[] = { 1 };
static unsigned gpio2_pins[] = { 2 };
static unsigned gpio3_pins[] = { 3 };
static unsigned gpio4_pins[] = { 4 };
static unsigned gpio5_pins[] = { 5 };
static unsigned gpio6_pins[] = { 6 };
static unsigned gpio7_pins[] = { 7 };
static unsigned gpio8_pins[] = { 8 };
static unsigned gpio9_pins[] = { 9 };
static unsigned gpio10_pins[] = { 10 };
static unsigned gpio11_pins[] = { 11 };
static unsigned gpio12_pins[] = { 12 };
static unsigned gpio13_pins[] = { 13 };
static unsigned gpio14_pins[] = { 14 };
static unsigned gpio15_pins[] = { 15 };
static unsigned gpio16_pins[] = { 16 };
static unsigned gpio17_pins[] = { 17 };
static unsigned gpio18_pins[] = { 18 };
static unsigned gpio19_pins[] = { 19 };
static unsigned gpio20_pins[] = { 20 };
static unsigned gpio21_pins[] = { 21 };
static unsigned gpio22_pins[] = { 22 };
static unsigned gpio23_pins[] = { 23 };
static unsigned gpio24_pins[] = { 24 };
static unsigned gpio25_pins[] = { 25 };
static unsigned gpio26_pins[] = { 26 };
static unsigned gpio27_pins[] = { 27 };
static unsigned gpio28_pins[] = { 28 };
static unsigned gpio29_pins[] = { 29 };
static unsigned gpio30_pins[] = { 30 };
static unsigned gpio31_pins[] = { 31 };
static unsigned hsspi_cs1_pins[] = { 36 };
static unsigned usb_port1_pins[] = { 38 };
static struct pingroup bcm6328_groups[] = {
BCM_PIN_GROUP(gpio0),
BCM_PIN_GROUP(gpio1),
BCM_PIN_GROUP(gpio2),
BCM_PIN_GROUP(gpio3),
BCM_PIN_GROUP(gpio4),
BCM_PIN_GROUP(gpio5),
BCM_PIN_GROUP(gpio6),
BCM_PIN_GROUP(gpio7),
BCM_PIN_GROUP(gpio8),
BCM_PIN_GROUP(gpio9),
BCM_PIN_GROUP(gpio10),
BCM_PIN_GROUP(gpio11),
BCM_PIN_GROUP(gpio12),
BCM_PIN_GROUP(gpio13),
BCM_PIN_GROUP(gpio14),
BCM_PIN_GROUP(gpio15),
BCM_PIN_GROUP(gpio16),
BCM_PIN_GROUP(gpio17),
BCM_PIN_GROUP(gpio18),
BCM_PIN_GROUP(gpio19),
BCM_PIN_GROUP(gpio20),
BCM_PIN_GROUP(gpio21),
BCM_PIN_GROUP(gpio22),
BCM_PIN_GROUP(gpio23),
BCM_PIN_GROUP(gpio24),
BCM_PIN_GROUP(gpio25),
BCM_PIN_GROUP(gpio26),
BCM_PIN_GROUP(gpio27),
BCM_PIN_GROUP(gpio28),
BCM_PIN_GROUP(gpio29),
BCM_PIN_GROUP(gpio30),
BCM_PIN_GROUP(gpio31),
BCM_PIN_GROUP(hsspi_cs1),
BCM_PIN_GROUP(usb_port1),
};
/* GPIO_MODE */
static const char * const led_groups[] = {
"gpio0" ,
"gpio1" ,
"gpio2" ,
"gpio3" ,
"gpio4" ,
"gpio5" ,
"gpio6" ,
"gpio7" ,
"gpio8" ,
"gpio9" ,
"gpio10" ,
"gpio11" ,
"gpio12" ,
"gpio13" ,
"gpio14" ,
"gpio15" ,
"gpio16" ,
"gpio17" ,
"gpio18" ,
"gpio19" ,
"gpio20" ,
"gpio21" ,
"gpio22" ,
"gpio23" ,
};
/* PINMUX_SEL */
static const char * const serial_led_data_groups[] = {
"gpio6" ,
};
static const char * const serial_led_clk_groups[] = {
"gpio7" ,
};
static const char * const inet_act_led_groups[] = {
"gpio11" ,
};
static const char * const pcie_clkreq_groups[] = {
"gpio16" ,
};
static const char * const ephy0_act_led_groups[] = {
"gpio25" ,
};
static const char * const ephy1_act_led_groups[] = {
"gpio26" ,
};
static const char * const ephy2_act_led_groups[] = {
"gpio27" ,
};
static const char * const ephy3_act_led_groups[] = {
"gpio28" ,
};
static const char * const hsspi_cs1_groups[] = {
"hsspi_cs1"
};
static const char * const usb_host_port_groups[] = {
"usb_port1" ,
};
static const char * const usb_device_port_groups[] = {
"usb_port1" ,
};
#define BCM6328_MODE_FUN(n) \
{ \
.name = #n , \
.groups = n## _groups, \
.num_groups = ARRAY_SIZE(n## _groups), \
.mode_val = 1 , \
}
#define BCM6328_MUX_FUN(n, mux) \
{ \
.name = #n , \
.groups = n## _groups, \
.num_groups = ARRAY_SIZE(n## _groups), \
.mux_val = mux, \
}
static const struct bcm6328_function bcm6328_funcs[] = {
BCM6328_MODE_FUN(led),
BCM6328_MUX_FUN(serial_led_data, 2 ),
BCM6328_MUX_FUN(serial_led_clk, 2 ),
BCM6328_MUX_FUN(inet_act_led, 1 ),
BCM6328_MUX_FUN(pcie_clkreq, 2 ),
BCM6328_MUX_FUN(ephy0_act_led, 1 ),
BCM6328_MUX_FUN(ephy1_act_led, 1 ),
BCM6328_MUX_FUN(ephy2_act_led, 1 ),
BCM6328_MUX_FUN(ephy3_act_led, 1 ),
BCM6328_MUX_FUN(hsspi_cs1, 2 ),
BCM6328_MUX_FUN(usb_host_port, 1 ),
BCM6328_MUX_FUN(usb_device_port, 2 ),
};
static inline unsigned int bcm6328_mux_off(unsigned int pin)
{
return bcm6328_mux[pin / 16 ];
}
static int bcm6328_pinctrl_get_group_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(bcm6328_groups);
}
static const char *bcm6328_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
return bcm6328_groups[group].name;
}
static int bcm6328_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group, const unsigned **pins,
unsigned *npins)
{
*pins = bcm6328_groups[group].pins;
*npins = bcm6328_groups[group].npins;
return 0 ;
}
static int bcm6328_pinctrl_get_func_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(bcm6328_funcs);
}
static const char *bcm6328_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return bcm6328_funcs[selector].name;
}
static int bcm6328_pinctrl_get_groups(struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
*groups = bcm6328_funcs[selector].groups;
*num_groups = bcm6328_funcs[selector].num_groups;
return 0 ;
}
static void bcm6328_rmw_mux(struct bcm63xx_pinctrl *pc, unsigned pin,
unsigned int mode, unsigned int mux)
{
if (pin < BCM6328_NUM_GPIOS)
regmap_update_bits(pc->regs, BCM6328_MODE_REG, BIT(pin),
mode ? BIT(pin) : 0 );
regmap_update_bits(pc->regs, bcm6328_mux_off(pin),
BCM6328_MUX_MASK << ((pin % 16 ) * 2 ),
mux << ((pin % 16 ) * 2 ));
}
static int bcm6328_pinctrl_set_mux(struct pinctrl_dev *pctldev,
unsigned selector, unsigned group)
{
struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
const struct pingroup *pg = &bcm6328_groups[group];
const struct bcm6328_function *f = &bcm6328_funcs[selector];
bcm6328_rmw_mux(pc, pg->pins[0 ], f->mode_val, f->mux_val);
return 0 ;
}
static int bcm6328_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
/* disable all functions using this pin */
bcm6328_rmw_mux(pc, offset, 0 , 0 );
return 0 ;
}
static const struct pinctrl_ops bcm6328_pctl_ops = {
.dt_free_map = pinctrl_utils_free_map,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.get_group_name = bcm6328_pinctrl_get_group_name,
.get_group_pins = bcm6328_pinctrl_get_group_pins,
.get_groups_count = bcm6328_pinctrl_get_group_count,
};
static const struct pinmux_ops bcm6328_pmx_ops = {
.get_function_groups = bcm6328_pinctrl_get_groups,
.get_function_name = bcm6328_pinctrl_get_func_name,
.get_functions_count = bcm6328_pinctrl_get_func_count,
.gpio_request_enable = bcm6328_gpio_request_enable,
.set_mux = bcm6328_pinctrl_set_mux,
.strict = true ,
};
static const struct bcm63xx_pinctrl_soc bcm6328_soc = {
.ngpios = BCM6328_NUM_GPIOS,
.npins = ARRAY_SIZE(bcm6328_pins),
.pctl_ops = &bcm6328_pctl_ops,
.pins = bcm6328_pins,
.pmx_ops = &bcm6328_pmx_ops,
};
static int bcm6328_pinctrl_probe(struct platform_device *pdev)
{
return bcm63xx_pinctrl_probe(pdev, &bcm6328_soc, NULL);
}
static const struct of_device_id bcm6328_pinctrl_match[] = {
{ .compatible = "brcm,bcm6328-pinctrl" , },
{ /* sentinel */ }
};
static struct platform_driver bcm6328_pinctrl_driver = {
.probe = bcm6328_pinctrl_probe,
.driver = {
.name = "bcm6328-pinctrl" ,
.of_match_table = bcm6328_pinctrl_match,
},
};
builtin_platform_driver(bcm6328_pinctrl_driver);
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