[PATCH 1/2] gpio: Add Turris Omnia MCU driver
Pali Rohár
pali at kernel.org
Mon Jul 25 15:01:12 CEST 2022
This driver registers GPIO controller and allows U-Boot to control GPIO
pins on MCU which is connected to Turris Omnia via i2c.
Signed-off-by: Pali Rohár <pali at kernel.org>
---
board/CZ.NIC/turris_omnia/MAINTAINERS | 1 +
drivers/gpio/Kconfig | 7 +
drivers/gpio/Makefile | 1 +
drivers/gpio/turris_omnia_mcu.c | 314 ++++++++++++++++++++++++++
4 files changed, 323 insertions(+)
create mode 100644 drivers/gpio/turris_omnia_mcu.c
diff --git a/board/CZ.NIC/turris_omnia/MAINTAINERS b/board/CZ.NIC/turris_omnia/MAINTAINERS
index 8258f4fc5b23..8bff97cc2737 100644
--- a/board/CZ.NIC/turris_omnia/MAINTAINERS
+++ b/board/CZ.NIC/turris_omnia/MAINTAINERS
@@ -6,4 +6,5 @@ F: arch/arm/dts/armada-385-turris-omnia*.dts*
F: board/CZ.NIC/turris_atsha_otp.*
F: board/CZ.NIC/turris_omnia/
F: configs/turris_omnia_defconfig
+F: drivers/gpio/turris_omnia_mcu.c
F: include/configs/turris_omnia.h
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index aaa152fae73b..82a8bca27000 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -598,4 +598,11 @@ config SLG7XL45106_I2C_GPO
8-bit gpo expander, all gpo lines are controlled by writing
value into data register.
+config TURRIS_OMNIA_MCU
+ bool "Turris Omnia MCU GPIO driver"
+ depends on DM_GPIO
+ default y if TARGET_TURRIS_OMNIA
+ help
+ Support for GPIOs on MCU connected to Turris Omnia via i2c.
+
endif
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d7552762d065..219f37e0e434 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -75,3 +75,4 @@ obj-$(CONFIG_MAX7320_GPIO) += max7320_gpio.o
obj-$(CONFIG_SL28CPLD_GPIO) += sl28cpld-gpio.o
obj-$(CONFIG_ZYNQMP_GPIO_MODEPIN) += zynqmp_gpio_modepin.o
obj-$(CONFIG_SLG7XL45106_I2C_GPO) += gpio_slg7xl45106.o
+obj-$(CONFIG_$(SPL_TPL_)TURRIS_OMNIA_MCU) += turris_omnia_mcu.o
diff --git a/drivers/gpio/turris_omnia_mcu.c b/drivers/gpio/turris_omnia_mcu.c
new file mode 100644
index 000000000000..44a6574d5f17
--- /dev/null
+++ b/drivers/gpio/turris_omnia_mcu.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0+
+// (C) 2022 Pali Rohár <pali at kernel.org>
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+#include <linux/log2.h>
+
+enum commands_e {
+ CMD_GET_STATUS_WORD = 0x01,
+ CMD_GENERAL_CONTROL = 0x02,
+
+ /* available if STS_FEATURES_SUPPORTED bit set in status word */
+ CMD_GET_FEATURES = 0x10,
+
+ /* available if FEAT_EXT_CMDS bit is set in features */
+ CMD_GET_EXT_STATUS_DWORD = 0x11,
+ CMD_EXT_CONTROL = 0x12,
+ CMD_GET_EXT_CONTROL_STATUS = 0x13,
+};
+
+/* CMD_GET_STATUS_WORD */
+enum sts_word_e {
+ STS_MCU_TYPE_MASK = GENMASK(1, 0),
+ STS_MCU_TYPE_STM32 = 0,
+ STS_MCU_TYPE_GD32 = 1,
+ STS_MCU_TYPE_MKL = 2,
+ STS_FEATURES_SUPPORTED = BIT(2),
+ STS_USER_REGULATOR_NOT_SUPPORTED = BIT(3),
+ STS_CARD_DET = BIT(4),
+ STS_MSATA_IND = BIT(5),
+ STS_USB30_OVC = BIT(6),
+ STS_USB31_OVC = BIT(7),
+ STS_USB30_PWRON = BIT(8),
+ STS_USB31_PWRON = BIT(9),
+ STS_ENABLE_4V5 = BIT(10),
+ STS_BUTTON_MODE = BIT(11),
+ STS_BUTTON_PRESSED = BIT(12),
+ STS_BUTTON_COUNTER_MASK = GENMASK(15, 13)
+};
+
+/* CMD_GENERAL_CONTROL */
+enum ctl_byte_e {
+ CTL_LIGHT_RST = BIT(0),
+ CTL_HARD_RST = BIT(1),
+ /*CTL_RESERVED = BIT(2),*/
+ CTL_USB30_PWRON = BIT(3),
+ CTL_USB31_PWRON = BIT(4),
+ CTL_ENABLE_4V5 = BIT(5),
+ CTL_BUTTON_MODE = BIT(6),
+ CTL_BOOTLOADER = BIT(7)
+};
+
+/* CMD_GET_FEATURES */
+enum features_e {
+ FEAT_EXT_CMDS = BIT(1),
+};
+
+struct turris_omnia_mcu_info {
+ u16 features;
+};
+
+static int turris_omnia_mcu_get_function(struct udevice *dev, uint offset)
+{
+ struct turris_omnia_mcu_info *info = dev_get_plat(dev);
+
+ switch (offset) {
+ /* bank 0 */
+ case 0 ... 15:
+ switch (offset) {
+ case ilog2(STS_USB30_PWRON):
+ case ilog2(STS_USB31_PWRON):
+ case ilog2(STS_ENABLE_4V5):
+ case ilog2(STS_BUTTON_MODE):
+ return GPIOF_OUTPUT;
+ default:
+ return GPIOF_INPUT;
+ }
+
+ /* bank 1 - supported only when FEAT_EXT_CMDS is set */
+ case (16 + 0) ... (16 + 31):
+ if (!(info->features & FEAT_EXT_CMDS))
+ return -EINVAL;
+ return GPIOF_INPUT;
+
+ /* bank 2 - supported only when FEAT_EXT_CMDS is set */
+ case (16 + 32 + 0) ... (16 + 32 + 15):
+ if (!(info->features & FEAT_EXT_CMDS))
+ return -EINVAL;
+ return GPIOF_OUTPUT;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int turris_omnia_mcu_get_value(struct udevice *dev, uint offset)
+{
+ struct turris_omnia_mcu_info *info = dev_get_plat(dev);
+ u8 val16[2];
+ u8 val32[4];
+ int ret;
+
+ switch (offset) {
+ /* bank 0 */
+ case 0 ... 15:
+ ret = dm_i2c_read(dev, CMD_GET_STATUS_WORD, val16, 2);
+ if (ret)
+ return ret;
+ return ((((u16)val16[1] << 8) | val16[0]) >> offset) & 0x1;
+
+ /* bank 1 - supported only when FEAT_EXT_CMDS is set */
+ case (16 + 0) ... (16 + 31):
+ if (!(info->features & FEAT_EXT_CMDS))
+ return -EINVAL;
+ ret = dm_i2c_read(dev, CMD_GET_EXT_STATUS_DWORD, val32, 4);
+ if (ret)
+ return ret;
+ return ((((u32)val32[3] << 24) | ((u32)val32[2] << 16) |
+ ((u32)val32[1] << 8) | val32[0]) >> (offset - 16)) & 0x1;
+
+ /* bank 2 - supported only when FEAT_EXT_CMDS is set */
+ case (16 + 32 + 0) ... (16 + 32 + 15):
+ if (!(info->features & FEAT_EXT_CMDS))
+ return -EINVAL;
+ ret = dm_i2c_read(dev, CMD_GET_EXT_CONTROL_STATUS, val16, 2);
+ if (ret)
+ return ret;
+ return ((((u16)val16[1] << 8) | val16[0]) >> (offset - 16 - 32)) & 0x1;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int turris_omnia_mcu_set_value(struct udevice *dev, uint offset, int value)
+{
+ struct turris_omnia_mcu_info *info = dev_get_plat(dev);
+ u8 val[2];
+ int ret;
+ u8 reg;
+
+ switch (offset) {
+ /* bank 0 */
+ case ilog2(STS_USB30_PWRON):
+ reg = CMD_GENERAL_CONTROL;
+ val[1] = CTL_USB30_PWRON;
+ break;
+ case ilog2(STS_USB31_PWRON):
+ reg = CMD_GENERAL_CONTROL;
+ val[1] = CTL_USB31_PWRON;
+ break;
+ case ilog2(STS_ENABLE_4V5):
+ reg = CMD_GENERAL_CONTROL;
+ val[1] = CTL_ENABLE_4V5;
+ break;
+ case ilog2(STS_BUTTON_MODE):
+ reg = CMD_GENERAL_CONTROL;
+ val[1] = CTL_BUTTON_MODE;
+ break;
+
+ /* bank 2 - supported only when FEAT_EXT_CMDS is set */
+ case (16 + 32 + 0) ... (16 + 32 + 15):
+ if (!(info->features & FEAT_EXT_CMDS))
+ return -EINVAL;
+ reg = CMD_EXT_CONTROL;
+ val[1] = BIT(offset - 16 - 32);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ val[0] = value ? val[1] : 0;
+
+ ret = dm_i2c_write(dev, reg, val, 2);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int turris_omnia_mcu_direction_input(struct udevice *dev, uint offset)
+{
+ int ret;
+
+ ret = turris_omnia_mcu_get_function(dev, offset);
+ if (ret < 0)
+ return ret;
+ else if (ret != GPIOF_INPUT)
+ return -EOPNOTSUPP;
+
+ return 0;
+}
+
+static int turris_omnia_mcu_direction_output(struct udevice *dev, uint offset, int value)
+{
+ int ret;
+
+ ret = turris_omnia_mcu_get_function(dev, offset);
+ if (ret < 0)
+ return ret;
+ else if (ret != GPIOF_OUTPUT)
+ return -EOPNOTSUPP;
+
+ return turris_omnia_mcu_set_value(dev, offset, value);
+}
+
+static int turris_omnia_mcu_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct ofnode_phandle_args *args)
+{
+ uint bank, gpio, flags, offset;
+ int ret;
+
+ if (args->args_count != 3)
+ return -EINVAL;
+
+ bank = args->args[0];
+ gpio = args->args[1];
+ flags = args->args[2];
+
+ switch (bank) {
+ case 0:
+ if (gpio >= 16)
+ return -EINVAL;
+ offset = gpio;
+ break;
+ case 1:
+ if (gpio >= 32)
+ return -EINVAL;
+ offset = 16 + gpio;
+ break;
+ case 2:
+ if (gpio >= 16)
+ return -EINVAL;
+ offset = 16 + 32 + gpio;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = turris_omnia_mcu_get_function(dev, offset);
+ if (ret < 0)
+ return ret;
+
+ if (ret == GPIOF_OUTPUT && ((flags & GPIOD_IS_IN) || !(flags & GPIOD_IS_OUT)))
+ return -EINVAL;
+ else if (ret == GPIOF_INPUT && (!(flags & GPIOD_IS_IN) || (flags & GPIOD_IS_OUT)))
+ return -EINVAL;
+
+ desc->offset = offset;
+ desc->flags = flags;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops turris_omnia_mcu_ops = {
+ .direction_input = turris_omnia_mcu_direction_input,
+ .direction_output = turris_omnia_mcu_direction_output,
+ .get_value = turris_omnia_mcu_get_value,
+ .set_value = turris_omnia_mcu_set_value,
+ .get_function = turris_omnia_mcu_get_function,
+ .xlate = turris_omnia_mcu_xlate,
+};
+
+static int turris_omnia_mcu_probe(struct udevice *dev)
+{
+ struct turris_omnia_mcu_info *info = dev_get_plat(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ u16 status;
+ u8 val[2];
+ int ret;
+
+ ret = dm_i2c_read(dev, CMD_GET_STATUS_WORD, val, 2);
+ if (ret) {
+ printf("Error: turris_omnia_mcu CMD_GET_STATUS_WORD failed: %d\n", ret);
+ return ret;
+ }
+
+ status = ((u16)val[1] << 8) | val[0];
+
+ if (status & STS_FEATURES_SUPPORTED) {
+ ret = dm_i2c_read(dev, CMD_GET_FEATURES, val, 2);
+ if (ret) {
+ printf("Error: turris_omnia_mcu CMD_GET_FEATURES failed: %d\n", ret);
+ return ret;
+ }
+ info->features = ((u16)val[1] << 8) | val[0];
+ }
+
+ uc_priv->bank_name = "mcu_";
+
+ if (info->features & FEAT_EXT_CMDS)
+ uc_priv->gpio_count = 16 + 32 + 16;
+ else
+ uc_priv->gpio_count = 16;
+
+ return 0;
+}
+
+static const struct udevice_id turris_omnia_mcu_ids[] = {
+ { .compatible = "cznic,turris-omnia-mcu" },
+ { }
+};
+
+U_BOOT_DRIVER(turris_omnia_mcu) = {
+ .name = "turris-omnia-mcu",
+ .id = UCLASS_GPIO,
+ .ops = &turris_omnia_mcu_ops,
+ .probe = turris_omnia_mcu_probe,
+ .plat_auto = sizeof(struct turris_omnia_mcu_info),
+ .of_match = turris_omnia_mcu_ids,
+};
--
2.20.1
More information about the U-Boot
mailing list