[PATCH v1 1/2] pinctrl: pinctrl-loongson2: add pinctrl driver support

From: Yinbo Zhu
Date: Thu Oct 20 2022 - 21:27:59 EST

The loongson2 SoC has a few pins that can be used as GPIOs or take
multiple other functions. Add a driver for the pinmuxing.

There is currently no support for GPIO pin pull-up and pull-down.

Signed-off-by: zhanghongchen <zhanghongchen@xxxxxxxxxxx>
Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
---
MAINTAINERS | 7 +
drivers/pinctrl/Kconfig | 10 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-loongson2.c | 330 ++++++++++++++++++++++++++++
4 files changed, 348 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-loongson2.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 8cc541ce89b8..c9883f145acb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11922,6 +11922,13 @@ S: Maintained
F: Documentation/devicetree/bindings/timer/loongson,ls2k-hpet.yaml
F: drivers/clocksource/loongson2_hpet.c

+LOONGSON2 SOC SERIES PINCTRL DRIVER
+M: zhanghongchen <zhanghongchen@xxxxxxxxxxx>
+M: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
+L: linux-gpio@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/pinctrl/pinctrl-loongson2.c
+
LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
M: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx>
M: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 1cf74b0c42e5..8e43cea0277c 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -507,6 +507,16 @@ config PINCTRL_ZYNQMP
This driver can also be built as a module. If so, the module
will be called pinctrl-zynqmp.

+config PINCTRL_LOONGSON2
+ tristate "Pinctrl driver for the Loongson2 SoC"
+ select PINMUX
+ select GENERIC_PINCONF
+ help
+ This selects pin control driver for the Loongson2 SoC. It
+ provides pin config functions multiplexing. GPIO pin pull-up
+ , pull-down functions are not supported. Say yes to enable
+ pinctrl for Loongson2 SoC.
+
source "drivers/pinctrl/actions/Kconfig"
source "drivers/pinctrl/aspeed/Kconfig"
source "drivers/pinctrl/bcm/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index e76f5cdc64b0..d8b8c5f9e2fd 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
obj-$(CONFIG_PINCTRL_THUNDERBAY) += pinctrl-thunderbay.o
obj-$(CONFIG_PINCTRL_ZYNQMP) += pinctrl-zynqmp.o
obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
+obj-$(CONFIG_PINCTRL_LOONGSON2) += pinctrl-loongson2.o

obj-y += actions/
obj-$(CONFIG_ARCH_ASPEED) += aspeed/
diff --git a/drivers/pinctrl/pinctrl-loongson2.c b/drivers/pinctrl/pinctrl-loongson2.c
new file mode 100644
index 000000000000..e4bb3e33e9db
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-loongson2.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: zhanghongchen <zhanghongchen@xxxxxxxxxxx>
+ * Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
+ * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "core.h"
+#include "pinctrl-utils.h"
+
+#define PMX_GROUP(grp, offset, bitv) \
+ { \
+ .name = #grp, \
+ .pins = grp ## _pins, \
+ .num_pins = ARRAY_SIZE(grp ## _pins), \
+ .reg = offset, \
+ .bit = bitv, \
+ }
+
+#define SPECIFIC_GROUP(group) \
+ static const char * const group##_groups[] = { \
+ #group \
+ }
+
+#define FUNCTION(fn) \
+ { \
+ .name = #fn, \
+ .groups = fn ## _groups, \
+ .num_groups = ARRAY_SIZE(fn ## _groups), \
+ }
+
+struct loongson2_pinctrl {
+ struct device *dev;
+ struct pinctrl_dev *pcdev;
+ struct pinctrl_desc desc;
+ struct device_node *of_node;
+ raw_spinlock_t lock;
+ void * __iomem reg_base;
+};
+
+struct loongson2_pmx_group {
+ const char *name;
+ const unsigned int *pins;
+ unsigned int num_pins;
+ unsigned int reg;
+ unsigned int bit;
+};
+
+struct loongson2_pmx_func {
+ const char *name;
+ const char * const *groups;
+ unsigned int num_groups;
+};
+
+#define LOONGSON2_PIN(x) PINCTRL_PIN(x, "gpio"#x)
+static const struct pinctrl_pin_desc loongson2_pctrl_pins[] = {
+ LOONGSON2_PIN(0), LOONGSON2_PIN(1), LOONGSON2_PIN(2), LOONGSON2_PIN(3),
+ LOONGSON2_PIN(4), LOONGSON2_PIN(5), LOONGSON2_PIN(6), LOONGSON2_PIN(7),
+ LOONGSON2_PIN(8), LOONGSON2_PIN(9), LOONGSON2_PIN(10), LOONGSON2_PIN(11),
+ LOONGSON2_PIN(12), LOONGSON2_PIN(13), LOONGSON2_PIN(14),
+ LOONGSON2_PIN(16), LOONGSON2_PIN(17), LOONGSON2_PIN(18), LOONGSON2_PIN(19),
+ LOONGSON2_PIN(20), LOONGSON2_PIN(21), LOONGSON2_PIN(22), LOONGSON2_PIN(23),
+ LOONGSON2_PIN(24), LOONGSON2_PIN(25), LOONGSON2_PIN(26), LOONGSON2_PIN(27),
+ LOONGSON2_PIN(28), LOONGSON2_PIN(29), LOONGSON2_PIN(30),
+ LOONGSON2_PIN(32), LOONGSON2_PIN(33), LOONGSON2_PIN(34), LOONGSON2_PIN(35),
+ LOONGSON2_PIN(36), LOONGSON2_PIN(37), LOONGSON2_PIN(38), LOONGSON2_PIN(39),
+ LOONGSON2_PIN(40), LOONGSON2_PIN(41),
+ LOONGSON2_PIN(44), LOONGSON2_PIN(45), LOONGSON2_PIN(46), LOONGSON2_PIN(47),
+ LOONGSON2_PIN(48), LOONGSON2_PIN(49), LOONGSON2_PIN(50), LOONGSON2_PIN(51),
+ LOONGSON2_PIN(52), LOONGSON2_PIN(53), LOONGSON2_PIN(54), LOONGSON2_PIN(55),
+ LOONGSON2_PIN(56), LOONGSON2_PIN(57), LOONGSON2_PIN(58), LOONGSON2_PIN(59),
+ LOONGSON2_PIN(60), LOONGSON2_PIN(61), LOONGSON2_PIN(62), LOONGSON2_PIN(63),
+};
+
+static const unsigned int gpio_pins[] = {0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 46, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63};
+static const unsigned int sdio_pins[] = {36, 37, 38, 39, 40, 41};
+static const unsigned int can1_pins[] = {34, 35};
+static const unsigned int can0_pins[] = {32, 33};
+static const unsigned int pwm3_pins[] = {23};
+static const unsigned int pwm2_pins[] = {22};
+static const unsigned int pwm1_pins[] = {21};
+static const unsigned int pwm0_pins[] = {20};
+static const unsigned int i2c1_pins[] = {18, 19};
+static const unsigned int i2c0_pins[] = {16, 17};
+static const unsigned int nand_pins[] = {44, 45, 46, 47, 48, 49, 50, 51,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60,
+ 61, 62, 63};
+static const unsigned int sata_led_pins[] = {14};
+static const unsigned int lio_pins[] = {};
+static const unsigned int i2s_pins[] = {24, 25, 26, 27, 28};
+static const unsigned int hda_pins[] = {24, 25, 26, 27, 28, 29, 30};
+static const unsigned int uart2_pins[] = {};
+static const unsigned int uart1_pins[] = {};
+static const unsigned int camera_pins[] = {};
+static const unsigned int dvo1_pins[] = {};
+static const unsigned int dvo0_pins[] = {};
+
+static struct loongson2_pmx_group loongson2_pmx_groups[] = {
+ PMX_GROUP(gpio, 0x0, 64),
+ PMX_GROUP(sdio, 0x0, 20),
+ PMX_GROUP(can1, 0x0, 17),
+ PMX_GROUP(can0, 0x0, 16),
+ PMX_GROUP(pwm3, 0x0, 15),
+ PMX_GROUP(pwm2, 0x0, 14),
+ PMX_GROUP(pwm1, 0x0, 13),
+ PMX_GROUP(pwm0, 0x0, 12),
+ PMX_GROUP(i2c1, 0x0, 11),
+ PMX_GROUP(i2c0, 0x0, 10),
+ PMX_GROUP(nand, 0x0, 9),
+ PMX_GROUP(sata_led, 0x0, 8),
+ PMX_GROUP(lio, 0x0, 7),
+ PMX_GROUP(i2s, 0x0, 6),
+ PMX_GROUP(hda, 0x0, 4),
+ PMX_GROUP(uart2, 0x8, 13),
+ PMX_GROUP(uart1, 0x8, 12),
+ PMX_GROUP(camera, 0x10, 5),
+ PMX_GROUP(dvo1, 0x10, 4),
+ PMX_GROUP(dvo0, 0x10, 1),
+
+};
+
+SPECIFIC_GROUP(sdio);
+SPECIFIC_GROUP(can1);
+SPECIFIC_GROUP(can0);
+SPECIFIC_GROUP(pwm3);
+SPECIFIC_GROUP(pwm2);
+SPECIFIC_GROUP(pwm1);
+SPECIFIC_GROUP(pwm0);
+SPECIFIC_GROUP(i2c1);
+SPECIFIC_GROUP(i2c0);
+SPECIFIC_GROUP(nand);
+SPECIFIC_GROUP(sata_led);
+SPECIFIC_GROUP(lio);
+SPECIFIC_GROUP(i2s);
+SPECIFIC_GROUP(hda);
+SPECIFIC_GROUP(uart2);
+SPECIFIC_GROUP(uart1);
+SPECIFIC_GROUP(camera);
+SPECIFIC_GROUP(dvo1);
+SPECIFIC_GROUP(dvo0);
+
+static const char * const gpio_groups[] = {
+ "sdio", "can1", "can0", "pwm3", "pwm2", "pwm1", "pwm0", "i2c1",
+ "i2c0", "nand", "sata_led", "lio", "i2s", "hda", "uart2", "uart1",
+ "camera", "dvo1", "dvo0"
+};
+
+static struct loongson2_pmx_func loongson2_pmx_functions[] = {
+ FUNCTION(gpio),
+ FUNCTION(sdio),
+ FUNCTION(can1),
+ FUNCTION(can0),
+ FUNCTION(pwm3),
+ FUNCTION(pwm2),
+ FUNCTION(pwm1),
+ FUNCTION(pwm0),
+ FUNCTION(i2c1),
+ FUNCTION(i2c0),
+ FUNCTION(nand),
+ FUNCTION(sata_led),
+ FUNCTION(lio),
+ FUNCTION(i2s),
+ FUNCTION(hda),
+ FUNCTION(uart2),
+ FUNCTION(uart1),
+ FUNCTION(camera),
+ FUNCTION(dvo1),
+ FUNCTION(dvo0),
+};
+
+static int loongson2_get_groups_count(struct pinctrl_dev *pcdev)
+{
+ return ARRAY_SIZE(loongson2_pmx_groups);
+}
+
+static const char *loongson2_get_group_name(struct pinctrl_dev *pcdev,
+ unsigned int selector)
+{
+ return loongson2_pmx_groups[selector].name;
+}
+
+static int loongson2_get_group_pins(struct pinctrl_dev *pcdev, unsigned int selector,
+ const unsigned int **pins, unsigned int *num_pins)
+{
+ *pins = loongson2_pmx_groups[selector].pins;
+ *num_pins = loongson2_pmx_groups[selector].num_pins;
+
+ return 0;
+}
+
+static void loongson2_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,
+ unsigned int offset)
+{
+ seq_printf(s, " %s", dev_name(pcdev->dev));
+}
+
+static const struct pinctrl_ops loongson2_pctrl_ops = {
+ .get_groups_count = loongson2_get_groups_count,
+ .get_group_name = loongson2_get_group_name,
+ .get_group_pins = loongson2_get_group_pins,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
+ .dt_free_map = pinctrl_utils_free_map,
+ .pin_dbg_show = loongson2_pin_dbg_show,
+};
+
+static int loongson2_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned int func_num,
+ unsigned int group_num)
+{
+ struct loongson2_pinctrl *pctrl = pinctrl_dev_get_drvdata(pcdev);
+ unsigned long reg = (unsigned long)pctrl->reg_base +
+ loongson2_pmx_groups[group_num].reg;
+ unsigned int mux_bit = loongson2_pmx_groups[group_num].bit;
+ unsigned int val;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+ val = readl((void *)reg);
+ if (func_num == 0)
+ val &= ~(1<<mux_bit);
+ else
+ val |= (1<<mux_bit);
+ writel(val, (void *)reg);
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+
+ return 0;
+}
+
+static int loongson2_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
+{
+ return ARRAY_SIZE(loongson2_pmx_functions);
+}
+
+static const char *loongson2_pmx_get_func_name(struct pinctrl_dev *pcdev,
+ unsigned int selector)
+{
+ return loongson2_pmx_functions[selector].name;
+}
+
+static int loongson2_pmx_get_groups(struct pinctrl_dev *pcdev,
+ unsigned int selector,
+ const char * const **groups,
+ unsigned int * const num_groups)
+{
+ *groups = loongson2_pmx_functions[selector].groups;
+ *num_groups = loongson2_pmx_functions[selector].num_groups;
+
+ return 0;
+}
+
+const struct pinmux_ops loongson2_pmx_ops = {
+ .set_mux = loongson2_pmx_set_mux,
+ .get_functions_count = loongson2_pmx_get_funcs_count,
+ .get_function_name = loongson2_pmx_get_func_name,
+ .get_function_groups = loongson2_pmx_get_groups,
+};
+
+static int loongson2_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct loongson2_pinctrl *pctrl;
+ struct resource *res;
+
+ pctrl = devm_kzalloc(dev, sizeof(struct loongson2_pinctrl), GFP_KERNEL);
+ if (!pctrl)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pctrl->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(pctrl->reg_base))
+ return PTR_ERR(pctrl->reg_base);
+
+ raw_spin_lock_init(&pctrl->lock);
+
+ pctrl->dev = dev;
+ pctrl->desc.name = "pinctrl-loongson2";
+ pctrl->desc.owner = THIS_MODULE;
+ pctrl->desc.pctlops = &loongson2_pctrl_ops;
+ pctrl->desc.pmxops = &loongson2_pmx_ops;
+ pctrl->desc.confops = NULL;
+ pctrl->desc.pins = loongson2_pctrl_pins;
+ pctrl->desc.npins = ARRAY_SIZE(loongson2_pctrl_pins);
+
+ pctrl->pcdev = devm_pinctrl_register(pctrl->dev, &pctrl->desc, pctrl);
+ if (IS_ERR(pctrl->pcdev)) {
+ dev_err(pctrl->dev, "can't register pinctrl device");
+ return PTR_ERR(pctrl->pcdev);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id loongson2_pinctrl_dt_match[] = {
+ {
+ .compatible = "loongson,ls2k-pinctrl",
+ },
+ { },
+};
+
+static struct platform_driver loongson2_pinctrl_driver = {
+ .probe = loongson2_pinctrl_probe,
+ .driver = {
+ .name = "loongson2-pinctrl",
+ .of_match_table = loongson2_pinctrl_dt_match,
+ },
+};
+
+static int __init loongson2_pinctrl_init(void)
+{
+ return platform_driver_register(&loongson2_pinctrl_driver);
+}
+arch_initcall(loongson2_pinctrl_init);
+
+static void __exit loongson2_pinctrl_exit(void)
+{
+ platform_driver_unregister(&loongson2_pinctrl_driver);
+}
+module_exit(loongson2_pinctrl_exit);
--
2.20.1