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523 lines
12 KiB
523 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Driver for BCM6368 GPIO unit (pinctrl + GPIO) |
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* |
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* Copyright (C) 2021 Álvaro Fernández Rojas <[email protected]> |
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* Copyright (C) 2016 Jonas Gorski <[email protected]> |
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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 BCM6368_NUM_GPIOS 38 |
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#define BCM6368_MODE_REG 0x18 |
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#define BCM6368_BASEMODE_REG 0x38 |
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#define BCM6368_BASEMODE_MASK 0x7 |
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#define BCM6368_BASEMODE_GPIO 0x0 |
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#define BCM6368_BASEMODE_UART1 0x1 |
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struct bcm6368_pingroup { |
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const char *name; |
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const unsigned * const pins; |
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const unsigned num_pins; |
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}; |
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struct bcm6368_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 dir_out:16; |
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unsigned basemode:3; |
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}; |
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struct bcm6368_priv { |
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struct regmap_field *overlays; |
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}; |
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#define BCM6368_BASEMODE_PIN(a, b) \ |
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{ \ |
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.number = a, \ |
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.name = b, \ |
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.drv_data = (void *)true \ |
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} |
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static const struct pinctrl_pin_desc bcm6368_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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BCM6368_BASEMODE_PIN(30, "gpio30"), |
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BCM6368_BASEMODE_PIN(31, "gpio31"), |
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BCM6368_BASEMODE_PIN(32, "gpio32"), |
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BCM6368_BASEMODE_PIN(33, "gpio33"), |
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PINCTRL_PIN(34, "gpio34"), |
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PINCTRL_PIN(35, "gpio35"), |
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PINCTRL_PIN(36, "gpio36"), |
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PINCTRL_PIN(37, "gpio37"), |
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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 uart1_grp_pins[] = { 30, 31, 32, 33 }; |
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#define BCM6368_GROUP(n) \ |
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{ \ |
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.name = #n, \ |
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.pins = n##_pins, \ |
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.num_pins = ARRAY_SIZE(n##_pins), \ |
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} |
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static struct bcm6368_pingroup bcm6368_groups[] = { |
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BCM6368_GROUP(gpio0), |
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BCM6368_GROUP(gpio1), |
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BCM6368_GROUP(gpio2), |
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BCM6368_GROUP(gpio3), |
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BCM6368_GROUP(gpio4), |
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BCM6368_GROUP(gpio5), |
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BCM6368_GROUP(gpio6), |
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BCM6368_GROUP(gpio7), |
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BCM6368_GROUP(gpio8), |
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BCM6368_GROUP(gpio9), |
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BCM6368_GROUP(gpio10), |
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BCM6368_GROUP(gpio11), |
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BCM6368_GROUP(gpio12), |
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BCM6368_GROUP(gpio13), |
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BCM6368_GROUP(gpio14), |
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BCM6368_GROUP(gpio15), |
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BCM6368_GROUP(gpio16), |
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BCM6368_GROUP(gpio17), |
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BCM6368_GROUP(gpio18), |
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BCM6368_GROUP(gpio19), |
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BCM6368_GROUP(gpio20), |
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BCM6368_GROUP(gpio21), |
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BCM6368_GROUP(gpio22), |
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BCM6368_GROUP(gpio23), |
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BCM6368_GROUP(gpio24), |
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BCM6368_GROUP(gpio25), |
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BCM6368_GROUP(gpio26), |
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BCM6368_GROUP(gpio27), |
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BCM6368_GROUP(gpio28), |
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BCM6368_GROUP(gpio29), |
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BCM6368_GROUP(gpio30), |
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BCM6368_GROUP(gpio31), |
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BCM6368_GROUP(uart1_grp), |
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}; |
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static const char * const analog_afe_0_groups[] = { |
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"gpio0", |
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}; |
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static const char * const analog_afe_1_groups[] = { |
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"gpio1", |
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}; |
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static const char * const sys_irq_groups[] = { |
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"gpio2", |
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}; |
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static const char * const serial_led_data_groups[] = { |
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"gpio3", |
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}; |
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static const char * const serial_led_clk_groups[] = { |
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"gpio4", |
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}; |
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static const char * const inet_led_groups[] = { |
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"gpio5", |
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}; |
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static const char * const ephy0_led_groups[] = { |
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"gpio6", |
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}; |
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static const char * const ephy1_led_groups[] = { |
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"gpio7", |
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}; |
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static const char * const ephy2_led_groups[] = { |
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"gpio8", |
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}; |
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static const char * const ephy3_led_groups[] = { |
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"gpio9", |
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}; |
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static const char * const robosw_led_data_groups[] = { |
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"gpio10", |
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}; |
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static const char * const robosw_led_clk_groups[] = { |
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"gpio11", |
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}; |
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static const char * const robosw_led0_groups[] = { |
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"gpio12", |
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}; |
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static const char * const robosw_led1_groups[] = { |
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"gpio13", |
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}; |
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static const char * const usb_device_led_groups[] = { |
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"gpio14", |
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}; |
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static const char * const pci_req1_groups[] = { |
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"gpio16", |
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}; |
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static const char * const pci_gnt1_groups[] = { |
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"gpio17", |
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}; |
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static const char * const pci_intb_groups[] = { |
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"gpio18", |
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}; |
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static const char * const pci_req0_groups[] = { |
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"gpio19", |
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}; |
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static const char * const pci_gnt0_groups[] = { |
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"gpio20", |
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}; |
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static const char * const pcmcia_cd1_groups[] = { |
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"gpio22", |
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}; |
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static const char * const pcmcia_cd2_groups[] = { |
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"gpio23", |
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}; |
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static const char * const pcmcia_vs1_groups[] = { |
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"gpio24", |
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}; |
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static const char * const pcmcia_vs2_groups[] = { |
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"gpio25", |
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}; |
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static const char * const ebi_cs2_groups[] = { |
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"gpio26", |
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}; |
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static const char * const ebi_cs3_groups[] = { |
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"gpio27", |
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}; |
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static const char * const spi_cs2_groups[] = { |
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"gpio28", |
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}; |
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static const char * const spi_cs3_groups[] = { |
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"gpio29", |
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}; |
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static const char * const spi_cs4_groups[] = { |
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"gpio30", |
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}; |
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static const char * const spi_cs5_groups[] = { |
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"gpio31", |
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}; |
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static const char * const uart1_groups[] = { |
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"uart1_grp", |
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}; |
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#define BCM6368_FUN(n, out) \ |
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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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.dir_out = out, \ |
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} |
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#define BCM6368_BASEMODE_FUN(n, val, out) \ |
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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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.basemode = BCM6368_BASEMODE_##val, \ |
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.dir_out = out, \ |
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} |
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static const struct bcm6368_function bcm6368_funcs[] = { |
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BCM6368_FUN(analog_afe_0, 1), |
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BCM6368_FUN(analog_afe_1, 1), |
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BCM6368_FUN(sys_irq, 1), |
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BCM6368_FUN(serial_led_data, 1), |
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BCM6368_FUN(serial_led_clk, 1), |
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BCM6368_FUN(inet_led, 1), |
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BCM6368_FUN(ephy0_led, 1), |
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BCM6368_FUN(ephy1_led, 1), |
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BCM6368_FUN(ephy2_led, 1), |
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BCM6368_FUN(ephy3_led, 1), |
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BCM6368_FUN(robosw_led_data, 1), |
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BCM6368_FUN(robosw_led_clk, 1), |
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BCM6368_FUN(robosw_led0, 1), |
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BCM6368_FUN(robosw_led1, 1), |
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BCM6368_FUN(usb_device_led, 1), |
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BCM6368_FUN(pci_req1, 0), |
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BCM6368_FUN(pci_gnt1, 0), |
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BCM6368_FUN(pci_intb, 0), |
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BCM6368_FUN(pci_req0, 0), |
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BCM6368_FUN(pci_gnt0, 0), |
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BCM6368_FUN(pcmcia_cd1, 0), |
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BCM6368_FUN(pcmcia_cd2, 0), |
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BCM6368_FUN(pcmcia_vs1, 0), |
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BCM6368_FUN(pcmcia_vs2, 0), |
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BCM6368_FUN(ebi_cs2, 1), |
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BCM6368_FUN(ebi_cs3, 1), |
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BCM6368_FUN(spi_cs2, 1), |
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BCM6368_FUN(spi_cs3, 1), |
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BCM6368_FUN(spi_cs4, 1), |
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BCM6368_FUN(spi_cs5, 1), |
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BCM6368_BASEMODE_FUN(uart1, UART1, 0x6), |
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}; |
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static int bcm6368_pinctrl_get_group_count(struct pinctrl_dev *pctldev) |
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{ |
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return ARRAY_SIZE(bcm6368_groups); |
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} |
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static const char *bcm6368_pinctrl_get_group_name(struct pinctrl_dev *pctldev, |
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unsigned group) |
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{ |
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return bcm6368_groups[group].name; |
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} |
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static int bcm6368_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, |
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unsigned group, const unsigned **pins, |
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unsigned *num_pins) |
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{ |
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*pins = bcm6368_groups[group].pins; |
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*num_pins = bcm6368_groups[group].num_pins; |
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return 0; |
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} |
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static int bcm6368_pinctrl_get_func_count(struct pinctrl_dev *pctldev) |
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{ |
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return ARRAY_SIZE(bcm6368_funcs); |
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} |
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static const char *bcm6368_pinctrl_get_func_name(struct pinctrl_dev *pctldev, |
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unsigned selector) |
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{ |
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return bcm6368_funcs[selector].name; |
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} |
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static int bcm6368_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 = bcm6368_funcs[selector].groups; |
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*num_groups = bcm6368_funcs[selector].num_groups; |
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return 0; |
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} |
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static int bcm6368_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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struct bcm6368_priv *priv = pc->driver_data; |
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const struct bcm6368_pingroup *pg = &bcm6368_groups[group]; |
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const struct bcm6368_function *fun = &bcm6368_funcs[selector]; |
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int i, pin; |
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if (fun->basemode) { |
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unsigned int mask = 0; |
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for (i = 0; i < pg->num_pins; i++) { |
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pin = pg->pins[i]; |
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if (pin < BCM63XX_BANK_GPIOS) |
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mask |= BIT(pin); |
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} |
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regmap_update_bits(pc->regs, BCM6368_MODE_REG, mask, 0); |
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regmap_field_write(priv->overlays, fun->basemode); |
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} else { |
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pin = pg->pins[0]; |
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if (bcm6368_pins[pin].drv_data) |
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regmap_field_write(priv->overlays, |
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BCM6368_BASEMODE_GPIO); |
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regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(pin), |
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BIT(pin)); |
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} |
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for (pin = 0; pin < pg->num_pins; pin++) { |
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struct pinctrl_gpio_range *range; |
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int hw_gpio = bcm6368_pins[pin].number; |
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range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio); |
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if (range) { |
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struct gpio_chip *gc = range->gc; |
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if (fun->dir_out & BIT(pin)) |
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gc->direction_output(gc, hw_gpio, 0); |
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else |
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gc->direction_input(gc, hw_gpio); |
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} |
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} |
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return 0; |
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} |
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static int bcm6368_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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struct bcm6368_priv *priv = pc->driver_data; |
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if (offset >= BCM63XX_BANK_GPIOS && !bcm6368_pins[offset].drv_data) |
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return 0; |
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/* disable all functions using this pin */ |
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if (offset < BCM63XX_BANK_GPIOS) |
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regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(offset), 0); |
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if (bcm6368_pins[offset].drv_data) |
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regmap_field_write(priv->overlays, BCM6368_BASEMODE_GPIO); |
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return 0; |
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} |
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static struct pinctrl_ops bcm6368_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 = bcm6368_pinctrl_get_group_name, |
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.get_group_pins = bcm6368_pinctrl_get_group_pins, |
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.get_groups_count = bcm6368_pinctrl_get_group_count, |
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}; |
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static struct pinmux_ops bcm6368_pmx_ops = { |
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.get_function_groups = bcm6368_pinctrl_get_groups, |
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.get_function_name = bcm6368_pinctrl_get_func_name, |
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.get_functions_count = bcm6368_pinctrl_get_func_count, |
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.gpio_request_enable = bcm6368_gpio_request_enable, |
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.set_mux = bcm6368_pinctrl_set_mux, |
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.strict = true, |
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}; |
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static const struct bcm63xx_pinctrl_soc bcm6368_soc = { |
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.ngpios = BCM6368_NUM_GPIOS, |
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.npins = ARRAY_SIZE(bcm6368_pins), |
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.pctl_ops = &bcm6368_pctl_ops, |
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.pins = bcm6368_pins, |
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.pmx_ops = &bcm6368_pmx_ops, |
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}; |
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static int bcm6368_pinctrl_probe(struct platform_device *pdev) |
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{ |
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struct reg_field overlays = REG_FIELD(BCM6368_BASEMODE_REG, 0, 15); |
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struct device *dev = &pdev->dev; |
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struct bcm63xx_pinctrl *pc; |
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struct bcm6368_priv *priv; |
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int err; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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err = bcm63xx_pinctrl_probe(pdev, &bcm6368_soc, (void *) priv); |
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if (err) |
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return err; |
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pc = platform_get_drvdata(pdev); |
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priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays); |
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if (IS_ERR(priv->overlays)) |
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return PTR_ERR(priv->overlays); |
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return 0; |
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} |
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static const struct of_device_id bcm6368_pinctrl_match[] = { |
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{ .compatible = "brcm,bcm6368-pinctrl", }, |
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{ /* sentinel */ } |
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}; |
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static struct platform_driver bcm6368_pinctrl_driver = { |
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.probe = bcm6368_pinctrl_probe, |
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.driver = { |
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.name = "bcm6368-pinctrl", |
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.of_match_table = bcm6368_pinctrl_match, |
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}, |
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}; |
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builtin_platform_driver(bcm6368_pinctrl_driver);
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