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