[PATCH v7 22/22] pinctrl: add a pincontrol driver for BCM6318

Álvaro Fernández Rojas
2021-03-15T11:44:45Z

Add a pincontrol driver for BCM6318. BCM6318 allows muxing most GPIOs
to different functions. BCM6318 is similar to BCM6328 with the addition
of a pad register, and the GPIO meaning of the mux register changes
based on the GPIO number.

Co-developed-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
v7: no changes
v6: no changes
v5: add changes suggested by Andy Shevchenko
v4: no changes
v3: use new shared code
v2: switch to GPIO_REGMAP

drivers/pinctrl/bcm/Kconfig | 8 +
drivers/pinctrl/bcm/Makefile | 1 +
drivers/pinctrl/bcm/pinctrl-bcm6318.c | 498 ++++++++++++++++++++++++++
3 files changed, 507 insertions(+)
create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm6318.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index 186985846120..33660e8fec05 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -36,6 +36,14 @@ config PINCTRL_BCM63XX
select PINCONF
select PINMUX

+config PINCTRL_BCM6318
+ bool "Broadcom BCM6318 GPIO driver"
+ depends on (BMIPS_GENERIC || COMPILE_TEST)
+ select PINCTRL_BCM63XX
+ default BMIPS_GENERIC
+ help
+ Say Y here to enable the Broadcom BCM6318 GPIO driver.
+
config PINCTRL_BCM6328
bool "Broadcom BCM6328 GPIO driver"
depends on (BMIPS_GENERIC || COMPILE_TEST)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 4117847fd279..00c7b7775e63 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -4,6 +4,7 @@
obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
obj-$(CONFIG_PINCTRL_BCM63XX) += pinctrl-bcm63xx.o
+obj-$(CONFIG_PINCTRL_BCM6318) += pinctrl-bcm6318.o
obj-$(CONFIG_PINCTRL_BCM6328) += pinctrl-bcm6328.o
obj-$(CONFIG_PINCTRL_BCM6358) += pinctrl-bcm6358.o
obj-$(CONFIG_PINCTRL_BCM6362) += pinctrl-bcm6362.o
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm6318.c b/drivers/pinctrl/bcm/pinctrl-bcm6318.c
new file mode 100644
index 000000000000..77fd9b58067d
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-bcm6318.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for BCM6318 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 BCM6318_NUM_GPIOS 50
+#define BCM6318_NUM_MUX 48
+
+#define BCM6318_MODE_REG 0x18
+#define BCM6318_MUX_REG 0x1c
+#define BCM6328_MUX_MASK GENMASK(1, 0)
+#define BCM6318_PAD_REG 0x54
+#define BCM6328_PAD_MASK GENMASK(3, 0)
+
+struct bcm6318_pingroup {
+ const char *name;
+ const unsigned * const pins;
+ const unsigned num_pins;
+};
+
+struct bcm6318_function {
+ const char *name;
+ const char * const *groups;
+ const unsigned num_groups;
+
+ unsigned mode_val:1;
+ unsigned mux_val:2;
+};
+
+static const struct pinctrl_pin_desc bcm6318_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"),
+ PINCTRL_PIN(32, "gpio32"),
+ PINCTRL_PIN(33, "gpio33"),
+ PINCTRL_PIN(34, "gpio34"),
+ PINCTRL_PIN(35, "gpio35"),
+ PINCTRL_PIN(36, "gpio36"),
+ PINCTRL_PIN(37, "gpio37"),
+ PINCTRL_PIN(38, "gpio38"),
+ PINCTRL_PIN(39, "gpio39"),
+ PINCTRL_PIN(40, "gpio40"),
+ PINCTRL_PIN(41, "gpio41"),
+ PINCTRL_PIN(42, "gpio42"),
+ PINCTRL_PIN(43, "gpio43"),
+ PINCTRL_PIN(44, "gpio44"),
+ PINCTRL_PIN(45, "gpio45"),
+ PINCTRL_PIN(46, "gpio46"),
+ PINCTRL_PIN(47, "gpio47"),
+ PINCTRL_PIN(48, "gpio48"),
+ PINCTRL_PIN(49, "gpio49"),
+};
+
+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 gpio32_pins[] = { 32 };
+static unsigned gpio33_pins[] = { 33 };
+static unsigned gpio34_pins[] = { 34 };
+static unsigned gpio35_pins[] = { 35 };
+static unsigned gpio36_pins[] = { 36 };
+static unsigned gpio37_pins[] = { 37 };
+static unsigned gpio38_pins[] = { 38 };
+static unsigned gpio39_pins[] = { 39 };
+static unsigned gpio40_pins[] = { 40 };
+static unsigned gpio41_pins[] = { 41 };
+static unsigned gpio42_pins[] = { 42 };
+static unsigned gpio43_pins[] = { 43 };
+static unsigned gpio44_pins[] = { 44 };
+static unsigned gpio45_pins[] = { 45 };
+static unsigned gpio46_pins[] = { 46 };
+static unsigned gpio47_pins[] = { 47 };
+static unsigned gpio48_pins[] = { 48 };
+static unsigned gpio49_pins[] = { 49 };
+
+#define BCM6318_GROUP(n) \
+ { \
+ .name = #n, \
+ .pins = n##_pins, \
+ .num_pins = ARRAY_SIZE(n##_pins), \
+ }
+
+static struct bcm6318_pingroup bcm6318_groups[] = {
+ BCM6318_GROUP(gpio0),
+ BCM6318_GROUP(gpio1),
+ BCM6318_GROUP(gpio2),
+ BCM6318_GROUP(gpio3),
+ BCM6318_GROUP(gpio4),
+ BCM6318_GROUP(gpio5),
+ BCM6318_GROUP(gpio6),
+ BCM6318_GROUP(gpio7),
+ BCM6318_GROUP(gpio8),
+ BCM6318_GROUP(gpio9),
+ BCM6318_GROUP(gpio10),
+ BCM6318_GROUP(gpio11),
+ BCM6318_GROUP(gpio12),
+ BCM6318_GROUP(gpio13),
+ BCM6318_GROUP(gpio14),
+ BCM6318_GROUP(gpio15),
+ BCM6318_GROUP(gpio16),
+ BCM6318_GROUP(gpio17),
+ BCM6318_GROUP(gpio18),
+ BCM6318_GROUP(gpio19),
+ BCM6318_GROUP(gpio20),
+ BCM6318_GROUP(gpio21),
+ BCM6318_GROUP(gpio22),
+ BCM6318_GROUP(gpio23),
+ BCM6318_GROUP(gpio24),
+ BCM6318_GROUP(gpio25),
+ BCM6318_GROUP(gpio26),
+ BCM6318_GROUP(gpio27),
+ BCM6318_GROUP(gpio28),
+ BCM6318_GROUP(gpio29),
+ BCM6318_GROUP(gpio30),
+ BCM6318_GROUP(gpio31),
+ BCM6318_GROUP(gpio32),
+ BCM6318_GROUP(gpio33),
+ BCM6318_GROUP(gpio34),
+ BCM6318_GROUP(gpio35),
+ BCM6318_GROUP(gpio36),
+ BCM6318_GROUP(gpio37),
+ BCM6318_GROUP(gpio38),
+ BCM6318_GROUP(gpio39),
+ BCM6318_GROUP(gpio40),
+ BCM6318_GROUP(gpio41),
+ BCM6318_GROUP(gpio42),
+ BCM6318_GROUP(gpio43),
+ BCM6318_GROUP(gpio44),
+ BCM6318_GROUP(gpio45),
+ BCM6318_GROUP(gpio46),
+ BCM6318_GROUP(gpio47),
+ BCM6318_GROUP(gpio48),
+ BCM6318_GROUP(gpio49),
+};
+
+/* 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 ephy0_spd_led_groups[] = {
+ "gpio0",
+};
+
+static const char * const ephy1_spd_led_groups[] = {
+ "gpio1",
+};
+
+static const char * const ephy2_spd_led_groups[] = {
+ "gpio2",
+};
+
+static const char * const ephy3_spd_led_groups[] = {
+ "gpio3",
+};
+
+static const char * const ephy0_act_led_groups[] = {
+ "gpio4",
+};
+
+static const char * const ephy1_act_led_groups[] = {
+ "gpio5",
+};
+
+static const char * const ephy2_act_led_groups[] = {
+ "gpio6",
+};
+
+static const char * const ephy3_act_led_groups[] = {
+ "gpio7",
+};
+
+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[] = {
+ "gpio8",
+};
+
+static const char * const inet_fail_led_groups[] = {
+ "gpio9",
+};
+
+static const char * const dsl_led_groups[] = {
+ "gpio10",
+};
+
+static const char * const post_fail_led_groups[] = {
+ "gpio11",
+};
+
+static const char * const wlan_wps_led_groups[] = {
+ "gpio12",
+};
+
+static const char * const usb_pwron_groups[] = {
+ "gpio13",
+};
+
+static const char * const usb_device_led_groups[] = {
+ "gpio13",
+};
+
+static const char * const usb_active_groups[] = {
+ "gpio40",
+};
+
+#define BCM6318_MODE_FUN(n) \
+ { \
+ .name = #n, \
+ .groups = n##_groups, \
+ .num_groups = ARRAY_SIZE(n##_groups), \
+ .mode_val = 1, \
+ }
+
+#define BCM6318_MUX_FUN(n, mux) \
+ { \
+ .name = #n, \
+ .groups = n##_groups, \
+ .num_groups = ARRAY_SIZE(n##_groups), \
+ .mux_val = mux, \
+ }
+
+static const struct bcm6318_function bcm6318_funcs[] = {
+ BCM6318_MODE_FUN(led),
+ BCM6318_MUX_FUN(ephy0_spd_led, 1),
+ BCM6318_MUX_FUN(ephy1_spd_led, 1),
+ BCM6318_MUX_FUN(ephy2_spd_led, 1),
+ BCM6318_MUX_FUN(ephy3_spd_led, 1),
+ BCM6318_MUX_FUN(ephy0_act_led, 1),
+ BCM6318_MUX_FUN(ephy1_act_led, 1),
+ BCM6318_MUX_FUN(ephy2_act_led, 1),
+ BCM6318_MUX_FUN(ephy3_act_led, 1),
+ BCM6318_MUX_FUN(serial_led_data, 3),
+ BCM6318_MUX_FUN(serial_led_clk, 3),
+ BCM6318_MUX_FUN(inet_act_led, 1),
+ BCM6318_MUX_FUN(inet_fail_led, 1),
+ BCM6318_MUX_FUN(dsl_led, 1),
+ BCM6318_MUX_FUN(post_fail_led, 1),
+ BCM6318_MUX_FUN(wlan_wps_led, 1),
+ BCM6318_MUX_FUN(usb_pwron, 1),
+ BCM6318_MUX_FUN(usb_device_led, 2),
+ BCM6318_MUX_FUN(usb_active, 2),
+};
+
+static inline unsigned int bcm6318_mux_off(unsigned int pin)
+{
+ return BCM6318_MUX_REG + (pin / 16) * 4;
+}
+
+static inline unsigned int bcm6318_pad_off(unsigned int pin)
+{
+ return BCM6318_PAD_REG + (pin / 8) * 4;
+}
+
+static int bcm6318_pinctrl_get_group_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(bcm6318_groups);
+}
+
+static const char *bcm6318_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned group)
+{
+ return bcm6318_groups[group].name;
+}
+
+static int bcm6318_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned group, const unsigned **pins,
+ unsigned *num_pins)
+{
+ *pins = bcm6318_groups[group].pins;
+ *num_pins = bcm6318_groups[group].num_pins;
+
+ return 0;
+}
+
+static int bcm6318_pinctrl_get_func_count(struct pinctrl_dev *pctldev)
+{
+ return ARRAY_SIZE(bcm6318_funcs);
+}
+
+static const char *bcm6318_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned selector)
+{
+ return bcm6318_funcs[selector].name;
+}
+
+static int bcm6318_pinctrl_get_groups(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ *groups = bcm6318_funcs[selector].groups;
+ *num_groups = bcm6318_funcs[selector].num_groups;
+
+ return 0;
+}
+
+static inline void bcm6318_rmw_mux(struct bcm63xx_pinctrl *pc, unsigned pin,
+ unsigned int mode, unsigned int mux)
+{
+ if (pin < BCM63XX_BANK_GPIOS)
+ regmap_update_bits(pc->regs, BCM6318_MODE_REG, BIT(pin),
+ mode ? BIT(pin) : 0);
+
+ if (pin < BCM6318_NUM_MUX)
+ regmap_update_bits(pc->regs,
+ bcm6318_mux_off(pin),
+ BCM6328_MUX_MASK << ((pin % 16) * 2),
+ mux << ((pin % 16) * 2));
+}
+
+static inline void bcm6318_set_pad(struct bcm63xx_pinctrl *pc, unsigned pin,
+ uint8_t val)
+{
+ regmap_update_bits(pc->regs, bcm6318_pad_off(pin),
+ BCM6328_PAD_MASK << ((pin % 8) * 4),
+ val << ((pin % 8) * 4));
+}
+
+static int bcm6318_pinctrl_set_mux(struct pinctrl_dev *pctldev,
+ unsigned selector, unsigned group)
+{
+ struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
+ const struct bcm6318_pingroup *pg = &bcm6318_groups[group];
+ const struct bcm6318_function *f = &bcm6318_funcs[selector];
+
+ bcm6318_rmw_mux(pc, pg->pins[0], f->mode_val, f->mux_val);
+
+ return 0;
+}
+
+static int bcm6318_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 */
+ if (offset < 13) {
+ /* GPIOs 0-12 use mux 0 as GPIO function */
+ bcm6318_rmw_mux(pc, offset, 0, 0);
+ } else if (offset < 42) {
+ /* GPIOs 13-41 use mux 3 as GPIO function */
+ bcm6318_rmw_mux(pc, offset, 0, 3);
+
+ bcm6318_set_pad(pc, offset, 0);
+ }
+
+ return 0;
+}
+
+static struct pinctrl_ops bcm6318_pctl_ops = {
+ .dt_free_map = pinctrl_utils_free_map,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .get_group_name = bcm6318_pinctrl_get_group_name,
+ .get_group_pins = bcm6318_pinctrl_get_group_pins,
+ .get_groups_count = bcm6318_pinctrl_get_group_count,
+};
+
+static struct pinmux_ops bcm6318_pmx_ops = {
+ .get_function_groups = bcm6318_pinctrl_get_groups,
+ .get_function_name = bcm6318_pinctrl_get_func_name,
+ .get_functions_count = bcm6318_pinctrl_get_func_count,
+ .gpio_request_enable = bcm6318_gpio_request_enable,
+ .set_mux = bcm6318_pinctrl_set_mux,
+ .strict = true,
+};
+
+static const struct bcm63xx_pinctrl_soc bcm6318_soc = {
+ .ngpios = BCM6318_NUM_GPIOS,
+ .npins = ARRAY_SIZE(bcm6318_pins),
+ .pctl_ops = &bcm6318_pctl_ops,
+ .pins = bcm6318_pins,
+ .pmx_ops = &bcm6318_pmx_ops,
+};
+
+static int bcm6318_pinctrl_probe(struct platform_device *pdev)
+{
+ return bcm63xx_pinctrl_probe(pdev, &bcm6318_soc, NULL);
+}
+
+static const struct of_device_id bcm6318_pinctrl_match[] = {
+ { .compatible = "brcm,bcm6318-pinctrl", },
+ { /* sentinel */ }
+};
+
+static struct platform_driver bcm6318_pinctrl_driver = {
+ .probe = bcm6318_pinctrl_probe,
+ .driver = {
+ .name = "bcm6318-pinctrl",
+ .of_match_table = bcm6318_pinctrl_match,
+ },
+};
+
+builtin_platform_driver(bcm6318_pinctrl_driver);
--
2.20.1