bcm53xx: add pending pinctrl driver

It's required to support devices using adjustable SoC pins for some
specific purpose (e.g. I2C, PWM, UART1).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit f00cb94f7ced064d74839892116c3a0b8f10c872)

2 files changed, 427 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/config-4.14 b/target/linux/bcm53xx/config-4.14
index cb47faa413..45ca7b4a06 100644
--- a/target/linux/bcm53xx/config-4.14
+++ b/target/linux/bcm53xx/config-4.14
@@ -294,6 +294,7 @@ CONFIG_PHYLIB=y
 # CONFIG_PHY_NS2_USB_DRD is not set
 CONFIG_PINCTRL=y
 # CONFIG_PINCTRL_IPROC_GPIO is not set
+CONFIG_PINCTRL_NS=y
 # CONFIG_PINCTRL_NS2_MUX is not set
 # CONFIG_PL310_ERRATA_588369 is not set
 # CONFIG_PL310_ERRATA_727915 is not set
diff --git a/target/linux/bcm53xx/patches-4.14/182-pinctrl-bcm-add-Northstar-driver.patch b/target/linux/bcm53xx/patches-4.14/182-pinctrl-bcm-add-Northstar-driver.patch
new file mode 100644
index 0000000000..35c83422a9
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.14/182-pinctrl-bcm-add-Northstar-driver.patch
@@ -0,0 +1,426 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 26 Sep 2018 21:31:03 +0200
+Subject: [PATCH] pinctrl: bcm: add Northstar driver
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This driver provides support for Northstar mux controller. It differs
+from Northstar Plus one so a new binding and driver were needed.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
+---
+ drivers/pinctrl/bcm/Kconfig      |  13 ++
+ drivers/pinctrl/bcm/Makefile     |   1 +
+ drivers/pinctrl/bcm/pinctrl-ns.c | 372 +++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 386 insertions(+)
+ create mode 100644 drivers/pinctrl/bcm/pinctrl-ns.c
+
+--- a/drivers/pinctrl/bcm/Kconfig
++++ b/drivers/pinctrl/bcm/Kconfig
+@@ -72,6 +72,19 @@ config PINCTRL_CYGNUS_MUX
+ 	  configuration, with the exception that certain individual pins
+ 	  can be overridden to GPIO function
+ 
++config PINCTRL_NS
++	bool "Broadcom Northstar pins driver"
++	depends on OF && (ARCH_BCM_5301X || COMPILE_TEST)
++	select PINMUX
++	select GENERIC_PINCONF
++	default ARCH_BCM_5301X
++	help
++	  Say yes here to enable the Broadcom NS SoC pins driver.
++
++	  The Broadcom Northstar pins driver supports muxing multi-purpose pins
++	  that can be used for various functions (e.g. SPI, I2C, UART) as well
++	  as GPIOs.
++
+ config PINCTRL_NSP_GPIO
+ 	bool "Broadcom NSP GPIO (with PINCONF) driver"
+ 	depends on OF_GPIO && (ARCH_BCM_NSP || COMPILE_TEST)
+--- a/drivers/pinctrl/bcm/Makefile
++++ b/drivers/pinctrl/bcm/Makefile
+@@ -5,6 +5,7 @@ obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinct
+ obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+ obj-$(CONFIG_PINCTRL_IPROC_GPIO)	+= pinctrl-iproc-gpio.o
+ obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
++obj-$(CONFIG_PINCTRL_NS)		+= pinctrl-ns.o
+ obj-$(CONFIG_PINCTRL_NSP_GPIO)		+= pinctrl-nsp-gpio.o
+ obj-$(CONFIG_PINCTRL_NS2_MUX)		+= pinctrl-ns2-mux.o
+ obj-$(CONFIG_PINCTRL_NSP_MUX)		+= pinctrl-nsp-mux.o
+--- /dev/null
++++ b/drivers/pinctrl/bcm/pinctrl-ns.c
+@@ -0,0 +1,372 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
++ */
++
++#include <linux/err.h>
++#include <linux/io.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/pinctrl/pinconf-generic.h>
++#include <linux/pinctrl/pinctrl.h>
++#include <linux/pinctrl/pinmux.h>
++#include <linux/platform_device.h>
++#include <linux/slab.h>
++
++#define FLAG_BCM4708		BIT(1)
++#define FLAG_BCM4709		BIT(2)
++#define FLAG_BCM53012		BIT(3)
++
++struct ns_pinctrl {
++	struct device *dev;
++	unsigned int chipset_flag;
++	struct pinctrl_dev *pctldev;
++	void __iomem *base;
++
++	struct pinctrl_desc pctldesc;
++	struct ns_pinctrl_group *groups;
++	unsigned int num_groups;
++	struct ns_pinctrl_function *functions;
++	unsigned int num_functions;
++};
++
++/*
++ * Pins
++ */
++
++static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
++	{ 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
++	{ 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++	{ 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
++};
++
++/*
++ * Groups
++ */
++
++struct ns_pinctrl_group {
++	const char *name;
++	const unsigned int *pins;
++	const unsigned int num_pins;
++	unsigned int chipsets;
++};
++
++static const unsigned int spi_pins[] = { 0, 1, 2, 3 };
++static const unsigned int i2c_pins[] = { 4, 5 };
++static const unsigned int mdio_pins[] = { 6, 7 };
++static const unsigned int pwm0_pins[] = { 8 };
++static const unsigned int pwm1_pins[] = { 9 };
++static const unsigned int pwm2_pins[] = { 10 };
++static const unsigned int pwm3_pins[] = { 11 };
++static const unsigned int uart1_pins[] = { 12, 13, 14, 15 };
++static const unsigned int uart2_pins[] = { 16, 17 };
++static const unsigned int sdio_pwr_pins[] = { 22 };
++static const unsigned int sdio_1p8v_pins[] = { 23 };
++
++#define NS_GROUP(_name, _pins, _chipsets)		\
++{							\
++	.name = _name,					\
++	.pins = _pins,					\
++	.num_pins = ARRAY_SIZE(_pins),			\
++	.chipsets = _chipsets,				\
++}
++
++static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
++	NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
++	NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
++};
++
++/*
++ * Functions
++ */
++
++struct ns_pinctrl_function {
++	const char *name;
++	const char * const *groups;
++	const unsigned int num_groups;
++	unsigned int chipsets;
++};
++
++static const char * const spi_groups[] = { "spi_grp" };
++static const char * const i2c_groups[] = { "i2c_grp" };
++static const char * const mdio_groups[] = { "mdio_grp" };
++static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
++					   "pwm3_grp" };
++static const char * const uart1_groups[] = { "uart1_grp" };
++static const char * const uart2_groups[] = { "uart2_grp" };
++static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };
++
++#define NS_FUNCTION(_name, _groups, _chipsets)		\
++{							\
++	.name = _name,					\
++	.groups = _groups,				\
++	.num_groups = ARRAY_SIZE(_groups),		\
++	.chipsets = _chipsets,				\
++}
++
++static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
++	NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
++	NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
++};
++
++/*
++ * Groups code
++ */
++
++static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	return ns_pinctrl->num_groups;
++}
++
++static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
++					     unsigned int selector)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	return ns_pinctrl->groups[selector].name;
++}
++
++static int ns_pinctrl_get_group_pins(struct pinctrl_dev *pctrl_dev,
++				     unsigned int selector,
++				     const unsigned int **pins,
++				     unsigned int *num_pins)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	*pins = ns_pinctrl->groups[selector].pins;
++	*num_pins = ns_pinctrl->groups[selector].num_pins;
++
++	return 0;
++}
++
++static const struct pinctrl_ops ns_pinctrl_ops = {
++	.get_groups_count = ns_pinctrl_get_groups_count,
++	.get_group_name = ns_pinctrl_get_group_name,
++	.get_group_pins = ns_pinctrl_get_group_pins,
++	.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
++	.dt_free_map = pinconf_generic_dt_free_map,
++};
++
++/*
++ * Functions code
++ */
++
++static int ns_pinctrl_get_functions_count(struct pinctrl_dev *pctrl_dev)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	return ns_pinctrl->num_functions;
++}
++
++static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
++						unsigned int selector)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	return ns_pinctrl->functions[selector].name;
++}
++
++static int ns_pinctrl_get_function_groups(struct pinctrl_dev *pctrl_dev,
++					  unsigned int selector,
++					  const char * const **groups,
++					  unsigned * const num_groups)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++
++	*groups = ns_pinctrl->functions[selector].groups;
++	*num_groups = ns_pinctrl->functions[selector].num_groups;
++
++	return 0;
++}
++
++static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
++			      unsigned int func_select,
++			      unsigned int grp_select)
++{
++	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
++	u32 unset = 0;
++	u32 tmp;
++	int i;
++
++	for (i = 0; i < ns_pinctrl->groups[grp_select].num_pins; i++) {
++		int pin_number = ns_pinctrl->groups[grp_select].pins[i];
++
++		unset |= BIT(pin_number);
++	}
++
++	tmp = readl(ns_pinctrl->base);
++	tmp &= ~unset;
++	writel(tmp, ns_pinctrl->base);
++
++	return 0;
++}
++
++static const struct pinmux_ops ns_pinctrl_pmxops = {
++	.get_functions_count = ns_pinctrl_get_functions_count,
++	.get_function_name = ns_pinctrl_get_function_name,
++	.get_function_groups = ns_pinctrl_get_function_groups,
++	.set_mux = ns_pinctrl_set_mux,
++};
++
++/*
++ * Controller code
++ */
++
++static struct pinctrl_desc ns_pinctrl_desc = {
++	.name = "pinctrl-ns",
++	.pctlops = &ns_pinctrl_ops,
++	.pmxops = &ns_pinctrl_pmxops,
++};
++
++static const struct of_device_id ns_pinctrl_of_match_table[] = {
++	{ .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
++	{ .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
++	{ .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
++	{ }
++};
++
++static int ns_pinctrl_probe(struct platform_device *pdev)
++{
++	struct device *dev = &pdev->dev;
++	const struct of_device_id *of_id;
++	struct ns_pinctrl *ns_pinctrl;
++	struct pinctrl_desc *pctldesc;
++	struct pinctrl_pin_desc *pin;
++	struct ns_pinctrl_group *group;
++	struct ns_pinctrl_function *function;
++	struct resource *res;
++	int i;
++
++	ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
++	if (!ns_pinctrl)
++		return -ENOMEM;
++	pctldesc = &ns_pinctrl->pctldesc;
++	platform_set_drvdata(pdev, ns_pinctrl);
++
++	/* Set basic properties */
++
++	ns_pinctrl->dev = dev;
++
++	of_id = of_match_device(ns_pinctrl_of_match_table, dev);
++	if (!of_id)
++		return -EINVAL;
++	ns_pinctrl->chipset_flag = (unsigned int)of_id->data;
++
++	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
++					   "cru_gpio_control");
++	ns_pinctrl->base = devm_ioremap_resource(dev, res);
++	if (IS_ERR(ns_pinctrl->base)) {
++		dev_err(dev, "Failed to map pinctrl regs\n");
++		return PTR_ERR(ns_pinctrl->base);
++	}
++
++	memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));
++
++	/* Set pinctrl properties */
++
++	pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
++				      sizeof(struct pinctrl_pin_desc),
++				      GFP_KERNEL);
++	if (!pctldesc->pins)
++		return -ENOMEM;
++	for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
++	     i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
++		const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
++		unsigned int chipsets = (unsigned int)src->drv_data;
++
++		if (chipsets & ns_pinctrl->chipset_flag) {
++			memcpy(pin++, src, sizeof(*src));
++			pctldesc->npins++;
++		}
++	}
++
++	ns_pinctrl->groups = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_groups),
++					  sizeof(struct ns_pinctrl_group),
++					  GFP_KERNEL);
++	if (!ns_pinctrl->groups)
++		return -ENOMEM;
++	for (i = 0, group = &ns_pinctrl->groups[0];
++	     i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
++		const struct ns_pinctrl_group *src = &ns_pinctrl_groups[i];
++
++		if (src->chipsets & ns_pinctrl->chipset_flag) {
++			memcpy(group++, src, sizeof(*src));
++			ns_pinctrl->num_groups++;
++		}
++	}
++
++	ns_pinctrl->functions = devm_kcalloc(dev,
++					     ARRAY_SIZE(ns_pinctrl_functions),
++					     sizeof(struct ns_pinctrl_function),
++					     GFP_KERNEL);
++	if (!ns_pinctrl->functions)
++		return -ENOMEM;
++	for (i = 0, function = &ns_pinctrl->functions[0];
++	     i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
++		const struct ns_pinctrl_function *src = &ns_pinctrl_functions[i];
++
++		if (src->chipsets & ns_pinctrl->chipset_flag) {
++			memcpy(function++, src, sizeof(*src));
++			ns_pinctrl->num_functions++;
++		}
++	}
++
++	/* Register */
++
++	ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
++	if (IS_ERR(ns_pinctrl->pctldev)) {
++		dev_err(dev, "Failed to register pinctrl\n");
++		return PTR_ERR(ns_pinctrl->pctldev);
++	}
++
++	return 0;
++}
++
++static struct platform_driver ns_pinctrl_driver = {
++	.probe = ns_pinctrl_probe,
++	.driver = {
++		.name = "ns-pinmux",
++		.of_match_table = ns_pinctrl_of_match_table,
++	},
++};
++
++module_platform_driver(ns_pinctrl_driver);
++
++MODULE_AUTHOR("Rafał Miłecki");
++MODULE_LICENSE("GPL v2");
++MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);