brcm63xx: add pinctrl support

Add and enable pincontrol drivers, and update dts(i) files with
appropriate hogs.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 436 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.4/136-pinctrl-add-a-pincontrol-driver-for-BCM6358.patch b/target/linux/brcm63xx/patches-4.4/136-pinctrl-add-a-pincontrol-driver-for-BCM6358.patch
new file mode 100644
index 0000000000..87dc741e21
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.4/136-pinctrl-add-a-pincontrol-driver-for-BCM6358.patch
@@ -0,0 +1,436 @@
+From fb00ef462f3f8b70ea8902151cc72810fe90b999 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Fri, 24 Jun 2016 22:16:01 +0200
+Subject: [PATCH 07/16] pinctrl: add a pincontrol driver for BCM6358
+
+Add a pincotrol driver for BCM6358. BCM6358 allow overlaying different
+functions onto the GPIO pins. It does not support configuring individual
+pins but only whole groups. These groups may overlap, and still require
+the directions to be set correctly in the GPIO register. In addition the
+functions register controls other, not directly mux related functions.
+
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+ drivers/pinctrl/bcm63xx/Kconfig           |   8 +
+ drivers/pinctrl/bcm63xx/Makefile          |   1 +
+ drivers/pinctrl/bcm63xx/pinctrl-bcm6358.c | 393 ++++++++++++++++++++++++++++++
+ 3 files changed, 402 insertions(+)
+ create mode 100644 drivers/pinctrl/bcm63xx/pinctrl-bcm6358.c
+
+--- a/drivers/pinctrl/bcm63xx/Kconfig
++++ b/drivers/pinctrl/bcm63xx/Kconfig
+@@ -15,3 +15,11 @@ config PINCTRL_BCM6348
+ 	select PINCONF
+ 	select PINCTRL_BCM63XX
+ 	select GENERIC_PINCONF
++
++config PINCTRL_BCM6358
++	bool "BCM6358 pincontrol driver" if COMPILE_TEST
++	select PINMUX
++	select PINCONF
++	select PINCTRL_BCM63XX
++	select GENERIC_PINCONF
++	select MFD_SYSCON
+--- a/drivers/pinctrl/bcm63xx/Makefile
++++ b/drivers/pinctrl/bcm63xx/Makefile
+@@ -1,3 +1,4 @@
+ obj-$(CONFIG_PINCTRL_BCM63XX)	+= pinctrl-bcm63xx.o
+ obj-$(CONFIG_PINCTRL_BCM6328)	+= pinctrl-bcm6328.o
+ obj-$(CONFIG_PINCTRL_BCM6348)	+= pinctrl-bcm6348.o
++obj-$(CONFIG_PINCTRL_BCM6358)	+= pinctrl-bcm6358.o
+--- /dev/null
++++ b/drivers/pinctrl/bcm63xx/pinctrl-bcm6358.c
+@@ -0,0 +1,393 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License.  See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
++ */
++
++#include <linux/kernel.h>
++#include <linux/bitops.h>
++#include <linux/gpio.h>
++#include <linux/gpio/driver.h>
++#include <linux/mfd/syscon.h>
++#include <linux/of.h>
++#include <linux/of_gpio.h>
++#include <linux/of_address.h>
++#include <linux/slab.h>
++#include <linux/regmap.h>
++#include <linux/platform_device.h>
++
++#include <linux/pinctrl/pinconf.h>
++#include <linux/pinctrl/pinconf-generic.h>
++#include <linux/pinctrl/pinmux.h>
++#include <linux/pinctrl/machine.h>
++
++#include "../core.h"
++#include "../pinctrl-utils.h"
++
++#include "pinctrl-bcm63xx.h"
++
++/* GPIO_MODE register */
++#define BCM6358_MODE_MUX_NONE		0
++
++/* overlays on gpio pins */
++#define BCM6358_MODE_MUX_EBI_CS		BIT(5)
++#define BCM6358_MODE_MUX_UART1		BIT(6)
++#define BCM6358_MODE_MUX_SPI_CS		BIT(7)
++#define BCM6358_MODE_MUX_ASYNC_MODEM	BIT(8)
++#define BCM6358_MODE_MUX_LEGACY_LED	BIT(9)
++#define BCM6358_MODE_MUX_SERIAL_LED	BIT(10)
++#define BCM6358_MODE_MUX_LED		BIT(11)
++#define BCM6358_MODE_MUX_UTOPIA		BIT(12)
++#define BCM6358_MODE_MUX_CLKRST		BIT(13)
++#define BCM6358_MODE_MUX_PWM_SYN_CLK	BIT(14)
++#define BCM6358_MODE_MUX_SYS_IRQ	BIT(15)
++
++#define BCM6358_NGPIO			40
++
++struct bcm6358_pingroup {
++	const char *name;
++	const unsigned * const pins;
++	const unsigned num_pins;
++
++	const u16 mode_val;
++
++	/* non-GPIO function muxes require the gpio direction to be set */
++	const u16 direction;
++};
++
++struct bcm6358_function {
++	const char *name;
++	const char * const *groups;
++	const unsigned num_groups;
++};
++
++struct bcm6358_pinctrl {
++	struct device *dev;
++	struct pinctrl_dev *pctldev;
++	struct pinctrl_desc desc;
++
++	struct regmap_field *overlays;
++
++	struct gpio_chip gpio[2];
++};
++
++#define BCM6358_GPIO_PIN(a, b, bit1, bit2, bit3)		\
++	{							\
++		.number = a,					\
++		.name = b,					\
++		.drv_data = (void *)(BCM6358_MODE_MUX_##bit1 |	\
++				     BCM6358_MODE_MUX_##bit2 |	\
++				     BCM6358_MODE_MUX_##bit3),	\
++	}
++
++static const struct pinctrl_pin_desc bcm6358_pins[] = {
++	BCM6358_GPIO_PIN(0, "gpio0", LED, NONE, NONE),
++	BCM6358_GPIO_PIN(1, "gpio1", LED, NONE, NONE),
++	BCM6358_GPIO_PIN(2, "gpio2", LED, NONE, NONE),
++	BCM6358_GPIO_PIN(3, "gpio3", LED, NONE, NONE),
++	PINCTRL_PIN(4, "gpio4"),
++	BCM6358_GPIO_PIN(5, "gpio5", SYS_IRQ, NONE, NONE),
++	BCM6358_GPIO_PIN(6, "gpio6", SERIAL_LED, NONE, NONE),
++	BCM6358_GPIO_PIN(7, "gpio7", SERIAL_LED, NONE, NONE),
++	BCM6358_GPIO_PIN(8, "gpio8", PWM_SYN_CLK, NONE, NONE),
++	BCM6358_GPIO_PIN(9, "gpio09", LEGACY_LED, NONE, NONE),
++	BCM6358_GPIO_PIN(10, "gpio10", LEGACY_LED, NONE, NONE),
++	BCM6358_GPIO_PIN(11, "gpio11", LEGACY_LED, NONE, NONE),
++	BCM6358_GPIO_PIN(12, "gpio12", LEGACY_LED, ASYNC_MODEM, UTOPIA),
++	BCM6358_GPIO_PIN(13, "gpio13", LEGACY_LED, ASYNC_MODEM, UTOPIA),
++	BCM6358_GPIO_PIN(14, "gpio14", LEGACY_LED, ASYNC_MODEM, UTOPIA),
++	BCM6358_GPIO_PIN(15, "gpio15", LEGACY_LED, ASYNC_MODEM, UTOPIA),
++	PINCTRL_PIN(16, "gpio16"),
++	PINCTRL_PIN(17, "gpio17"),
++	PINCTRL_PIN(18, "gpio18"),
++	PINCTRL_PIN(19, "gpio19"),
++	PINCTRL_PIN(20, "gpio20"),
++	PINCTRL_PIN(21, "gpio21"),
++	BCM6358_GPIO_PIN(22, "gpio22", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(23, "gpio23", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(24, "gpio24", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(25, "gpio25", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(26, "gpio26", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(27, "gpio27", UTOPIA, NONE, NONE),
++	BCM6358_GPIO_PIN(28, "gpio28", UTOPIA, UART1, NONE),
++	BCM6358_GPIO_PIN(29, "gpio29", UTOPIA, UART1, NONE),
++	BCM6358_GPIO_PIN(30, "gpio30", UTOPIA, UART1, EBI_CS),
++	BCM6358_GPIO_PIN(31, "gpio31", UTOPIA, UART1, EBI_CS),
++	BCM6358_GPIO_PIN(32, "gpio32", SPI_CS, NONE, NONE),
++	BCM6358_GPIO_PIN(33, "gpio33", SPI_CS, NONE, NONE),
++	PINCTRL_PIN(34, "gpio34"),
++	PINCTRL_PIN(35, "gpio35"),
++	PINCTRL_PIN(36, "gpio36"),
++	PINCTRL_PIN(37, "gpio37"),
++	PINCTRL_PIN(38, "gpio38"),
++	PINCTRL_PIN(39, "gpio39"),
++};
++
++static unsigned ebi_cs_grp_pins[] = { 30, 31 };
++
++static unsigned uart1_grp_pins[] = { 28, 29, 30, 31 };
++
++static unsigned spi_cs_grp_pins[] = { 32, 33 };
++
++static unsigned async_modem_grp_pins[] = { 12, 13, 14, 15 };
++
++static unsigned serial_led_grp_pins[] = { 6, 7 };
++
++static unsigned legacy_led_grp_pins[] = { 9, 10, 11, 12, 13, 14, 15 };
++
++static unsigned led_grp_pins[] = { 0, 1, 2, 3 };
++
++static unsigned utopia_grp_pins[] = {
++	12, 13, 14, 15, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
++};
++
++static unsigned pwm_syn_clk_grp_pins[] = { 8 };
++
++static unsigned sys_irq_grp_pins[] = { 5 };
++
++#define BCM6358_GPIO_MUX_GROUP(n, bit, dir)			\
++	{							\
++		.name = #n,					\
++		.pins = n##_pins,				\
++		.num_pins = ARRAY_SIZE(n##_pins),		\
++		.mode_val = BCM6358_MODE_MUX_##bit,		\
++		.direction = dir,				\
++	}
++
++static const struct bcm6358_pingroup bcm6358_groups[] = {
++	BCM6358_GPIO_MUX_GROUP(ebi_cs_grp, EBI_CS, 0x3),
++	BCM6358_GPIO_MUX_GROUP(uart1_grp, UART1, 0x2),
++	BCM6358_GPIO_MUX_GROUP(spi_cs_grp, SPI_CS, 0x6),
++	BCM6358_GPIO_MUX_GROUP(async_modem_grp, ASYNC_MODEM, 0x6),
++	BCM6358_GPIO_MUX_GROUP(legacy_led_grp, LEGACY_LED, 0x7f),
++	BCM6358_GPIO_MUX_GROUP(serial_led_grp, SERIAL_LED, 0x3),
++	BCM6358_GPIO_MUX_GROUP(led_grp, LED, 0xf),
++	BCM6358_GPIO_MUX_GROUP(utopia_grp, UTOPIA, 0x000f),
++	BCM6358_GPIO_MUX_GROUP(pwm_syn_clk_grp, PWM_SYN_CLK, 0x1),
++	BCM6358_GPIO_MUX_GROUP(sys_irq_grp, SYS_IRQ, 0x1),
++};
++
++static const char * const ebi_cs_groups[] = {
++	"ebi_cs_grp"
++};
++
++static const char * const uart1_groups[] = {
++	"uart1_grp"
++};
++
++static const char * const spi_cs_2_3_groups[] = {
++	"spi_cs_2_3_grp"
++};
++
++static const char * const async_modem_groups[] = {
++	"async_modem_grp"
++};
++
++static const char * const legacy_led_groups[] = {
++	"legacy_led_grp",
++};
++
++static const char * const serial_led_groups[] = {
++	"serial_led_grp",
++};
++
++static const char * const led_groups[] = {
++	"led_grp",
++};
++
++static const char * const clkrst_groups[] = {
++	"clkrst_grp",
++};
++
++static const char * const pwm_syn_clk_groups[] = {
++	"pwm_syn_clk_grp",
++};
++
++static const char * const sys_irq_groups[] = {
++	"sys_irq_grp",
++};
++
++#define BCM6358_FUN(n)					\
++	{						\
++		.name = #n,				\
++		.groups = n##_groups,			\
++		.num_groups = ARRAY_SIZE(n##_groups),	\
++	}
++
++static const struct bcm6358_function bcm6358_funcs[] = {
++	BCM6358_FUN(ebi_cs),
++	BCM6358_FUN(uart1),
++	BCM6358_FUN(spi_cs_2_3),
++	BCM6358_FUN(async_modem),
++	BCM6358_FUN(legacy_led),
++	BCM6358_FUN(serial_led),
++	BCM6358_FUN(led),
++	BCM6358_FUN(clkrst),
++	BCM6358_FUN(pwm_syn_clk),
++	BCM6358_FUN(sys_irq),
++};
++
++static int bcm6358_pinctrl_get_group_count(struct pinctrl_dev *pctldev)
++{
++	return ARRAY_SIZE(bcm6358_groups);
++}
++
++static const char *bcm6358_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
++						  unsigned group)
++{
++	return bcm6358_groups[group].name;
++}
++
++static int bcm6358_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
++					  unsigned group, const unsigned **pins,
++					  unsigned *num_pins)
++{
++	*pins = bcm6358_groups[group].pins;
++	*num_pins = bcm6358_groups[group].num_pins;
++
++	return 0;
++}
++
++static int bcm6358_pinctrl_get_func_count(struct pinctrl_dev *pctldev)
++{
++	return ARRAY_SIZE(bcm6358_funcs);
++}
++
++static const char *bcm6358_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
++						 unsigned selector)
++{
++	return bcm6358_funcs[selector].name;
++}
++
++static int bcm6358_pinctrl_get_groups(struct pinctrl_dev *pctldev,
++				      unsigned selector,
++				      const char * const **groups,
++				      unsigned * const num_groups)
++{
++	*groups = bcm6358_funcs[selector].groups;
++	*num_groups = bcm6358_funcs[selector].num_groups;
++
++	return 0;
++}
++
++static int bcm6358_pinctrl_set_mux(struct pinctrl_dev *pctldev,
++				   unsigned selector, unsigned group)
++{
++	struct bcm6358_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
++	const struct bcm6358_pingroup *grp = &bcm6358_groups[group];
++	u32 val = grp->mode_val;
++	u32 mask = val;
++	unsigned pin;
++
++	for (pin = 0; pin < grp->num_pins; pin++)
++		mask |= (unsigned long)bcm6358_pins[pin].drv_data;
++
++	regmap_field_update_bits(pctl->overlays, mask, val);
++
++	for (pin = 0; pin < grp->num_pins; pin++) {
++		int hw_gpio = bcm6358_pins[pin].number;
++		struct gpio_chip *gc = &pctl->gpio[hw_gpio / 32];
++
++		if (grp->direction & BIT(pin))
++			gc->direction_output(gc, hw_gpio % 32, 0);
++		else
++			gc->direction_input(gc, hw_gpio % 32);
++	}
++
++	return 0;
++}
++
++static int bcm6358_gpio_request_enable(struct pinctrl_dev *pctldev,
++				       struct pinctrl_gpio_range *range,
++				       unsigned offset)
++{
++	struct bcm6358_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
++	u32 mask;
++
++	mask = (unsigned long)bcm6358_pins[offset].drv_data;
++	if (!mask)
++		return 0;
++
++	/* disable all functions using this pin */
++	return regmap_field_update_bits(pctl->overlays, mask, 0);
++}
++
++static struct pinctrl_ops bcm6358_pctl_ops = {
++	.get_groups_count	= bcm6358_pinctrl_get_group_count,
++	.get_group_name		= bcm6358_pinctrl_get_group_name,
++	.get_group_pins		= bcm6358_pinctrl_get_group_pins,
++#ifdef CONFIG_OF
++	.dt_node_to_map		= pinconf_generic_dt_node_to_map_pin,
++	.dt_free_map		= pinctrl_utils_free_map,
++#endif
++};
++
++static struct pinmux_ops bcm6358_pmx_ops = {
++	.get_functions_count	= bcm6358_pinctrl_get_func_count,
++	.get_function_name	= bcm6358_pinctrl_get_func_name,
++	.get_function_groups	= bcm6358_pinctrl_get_groups,
++	.set_mux		= bcm6358_pinctrl_set_mux,
++	.gpio_request_enable	= bcm6358_gpio_request_enable,
++	.strict			= true,
++};
++
++static int bcm6358_pinctrl_probe(struct platform_device *pdev)
++{
++	struct bcm6358_pinctrl *pctl;
++	struct regmap *mode;
++	struct reg_field overlays = REG_FIELD(0, 0, 15);
++
++	if (pdev->dev.of_node)
++		mode = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
++						       "brcm,gpiomode");
++	else
++		mode = syscon_regmap_lookup_by_pdevname("syscon.fffe0098");
++
++	if (IS_ERR(mode))
++		return PTR_ERR(mode);
++
++	pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
++	if (!pctl)
++		return -ENOMEM;
++
++	pctl->overlays = devm_regmap_field_alloc(&pdev->dev, mode, overlays);
++	if (IS_ERR(pctl->overlays))
++		return PTR_ERR(pctl->overlays);
++
++	/* disable all muxes by default */
++	regmap_field_write(pctl->overlays, 0);
++
++	pctl->desc.name = dev_name(&pdev->dev);
++	pctl->desc.owner = THIS_MODULE;
++	pctl->desc.pctlops = &bcm6358_pctl_ops;
++	pctl->desc.pmxops = &bcm6358_pmx_ops;
++
++	pctl->desc.npins = ARRAY_SIZE(bcm6358_pins);
++	pctl->desc.pins = bcm6358_pins;
++
++	platform_set_drvdata(pdev, pctl);
++
++	pctl->pctldev = bcm63xx_pinctrl_register(pdev, &pctl->desc, pctl,
++						 pctl->gpio, BCM6358_NGPIO);
++	if (IS_ERR(pctl->pctldev))
++		return PTR_ERR(pctl->pctldev);
++
++	return 0;
++}
++
++static const struct of_device_id bcm6358_pinctrl_match[] = {
++	{ .compatible = "brcm,bcm6358-pinctrl", },
++	{ },
++};
++
++static struct platform_driver bcm6358_pinctrl_driver = {
++	.probe = bcm6358_pinctrl_probe,
++	.driver = {
++		.name = "bcm6358-pinctrl",
++		.of_match_table = bcm6358_pinctrl_match,
++	},
++};
++
++builtin_platform_driver(bcm6358_pinctrl_driver);