[PATCH V2 2/2] pinctrl: bcm: add Northstar driver

Rafał Miłecki zajec5 at gmail.com
Mon Sep 24 02:26:32 PDT 2018


From: Rafał Miłecki <rafal at milecki.pl>

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 at milecki.pl>
---
V2: Define more pins, groups, functions
    Simplify ns_pinctrl_set_mux() as Northstar uses 1:1 mapping
---
 drivers/pinctrl/bcm/Kconfig      |  13 ++
 drivers/pinctrl/bcm/Makefile     |   1 +
 drivers/pinctrl/bcm/pinctrl-ns.c | 262 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 276 insertions(+)
 create mode 100644 drivers/pinctrl/bcm/pinctrl-ns.c

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
index 0f38d51f47c6..c8575399d6f7 100644
--- a/drivers/pinctrl/bcm/Kconfig
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -73,6 +73,19 @@ 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)
diff --git a/drivers/pinctrl/bcm/Makefile b/drivers/pinctrl/bcm/Makefile
index 80ceb9dae944..79d5e49fdd9a 100644
--- a/drivers/pinctrl/bcm/Makefile
+++ b/drivers/pinctrl/bcm/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(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
diff --git a/drivers/pinctrl/bcm/pinctrl-ns.c b/drivers/pinctrl/bcm/pinctrl-ns.c
new file mode 100644
index 000000000000..5bd9f581850e
--- /dev/null
+++ b/drivers/pinctrl/bcm/pinctrl-ns.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Rafał Miłecki <rafal at milecki.pl>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.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>
+
+struct ns_pinctrl {
+	struct pinctrl_dev *pctldev;
+	struct device *dev;
+	void __iomem *base;
+};
+
+/*
+ * Pins
+ */
+
+static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
+	{ 0, "spi_clk" },
+	{ 1, "spi_ss" },
+	{ 2, "spi_mosi" },
+	{ 3, "spi_miso" },
+	{ 4, "i2c_scl" },
+	{ 5, "i2c_sda" },
+	{ 6, "mdc" },
+	{ 7, "mdio" },
+	{ 8, "pwm0" },
+	{ 9, "pwm1" },
+	{ 10, "pwm2" },
+	{ 11, "pwm3" },
+	{ 12, "uart1_rx" },
+	{ 13, "uart1_tx" },
+	{ 14, "uart1_cts" },
+	{ 15, "uart1_rts" },
+};
+
+/*
+ * Groups
+ */
+
+struct ns_pinctrl_group {
+	const char *name;
+	const unsigned int *pins;
+	const unsigned int num_pins;
+};
+
+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 };
+
+#define NS_GROUP(_name, _pins)			\
+{						\
+	.name = _name,				\
+	.pins = _pins,				\
+	.num_pins = ARRAY_SIZE(_pins),		\
+}
+
+static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
+	NS_GROUP("spi_grp", spi_pins),
+	NS_GROUP("i2c_grp", i2c_pins),
+	NS_GROUP("mdio_grp", mdio_pins),
+	NS_GROUP("pwm0_grp", pwm0_pins),
+	NS_GROUP("pwm1_grp", pwm1_pins),
+	NS_GROUP("pwm2_grp", pwm2_pins),
+	NS_GROUP("pwm3_grp", pwm3_pins),
+	NS_GROUP("uart1_grp", uart1_pins),
+};
+
+/*
+ * Functions
+ */
+
+struct ns_pinctrl_function {
+	const char *name;
+	const char * const *groups;
+	const unsigned int num_groups;
+};
+
+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" };
+
+#define NS_FUNCTION(_name, _groups)		\
+{						\
+	.name = _name,				\
+	.groups = _groups,			\
+	.num_groups = ARRAY_SIZE(_groups),	\
+}
+
+static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
+	NS_FUNCTION("spi", spi_groups),
+	NS_FUNCTION("i2c", i2c_groups),
+	NS_FUNCTION("mdio", mdio_groups),
+	NS_FUNCTION("pwm", pwm_groups),
+	NS_FUNCTION("uart1", uart1_groups),
+};
+
+/*
+ * Groups code
+ */
+
+static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
+{
+	return ARRAY_SIZE(ns_pinctrl_groups);
+}
+
+static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
+					     unsigned int selector)
+{
+	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)
+{
+	*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)
+{
+	return ARRAY_SIZE(ns_pinctrl_functions);
+}
+
+static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
+						unsigned int selector)
+{
+	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)
+{
+	*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",
+	.pins = ns_pinctrl_pins,
+	.npins = ARRAY_SIZE(ns_pinctrl_pins),
+	.pctlops = &ns_pinctrl_ops,
+	.pmxops = &ns_pinctrl_pmxops,
+};
+
+static int ns_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ns_pinctrl *ns_pinctrl;
+	struct resource *res;
+
+	ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
+	if (!ns_pinctrl)
+		return -ENOMEM;
+	ns_pinctrl->dev = dev;
+
+	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);
+	}
+
+	platform_set_drvdata(pdev, ns_pinctrl);
+
+	ns_pinctrl->pctldev = devm_pinctrl_register(dev, &ns_pinctrl_desc,
+						    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 const struct of_device_id ns_pinctrl_of_match_table[] = {
+	{ .compatible = "brcm,ns-pinmux" },
+	{ }
+};
+
+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");
-- 
2.13.7




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