From: Rafał Miłecki <rafal@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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@xxxxxxxxxx>
+ */
+
+#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
