gpio: turris_omnia_mcu: Add support for system power off via sysreset

Add support for system power off via UCLASS_SYSRESET. Newer versions of
Turris Omnia MCU firmware can power off the board (MCU will disable
almost all voltage regulators and go into low power mode).

Move the MCU driver into drivers/misc and register it under UCLASS_MISC.
The sysreset and gpio device are bound as child devices of the MCU device.

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>

3 files changed, 0 insertions, 296 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index a7fb1eb3f4..b050585389 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -665,13 +665,6 @@ 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.
-
 config FTGPIO010
 	bool "Faraday Technology FTGPIO010 driver"
 	depends on DM_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 90711702a6..4a29315435 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -73,7 +73,6 @@ obj-$(CONFIG_$(SPL_)MAX77663_GPIO)	+= max77663_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_$(SPL_TPL_)TURRIS_OMNIA_MCU)	+= turris_omnia_mcu.o
 obj-$(CONFIG_FTGPIO010)		+= ftgpio010.o
 obj-$(CONFIG_ADP5585_GPIO)	+= adp5585_gpio.o
 obj-$(CONFIG_RZG2L_GPIO)	+= rzg2l-gpio.o
diff --git a/drivers/gpio/turris_omnia_mcu.c b/drivers/gpio/turris_omnia_mcu.c
deleted file mode 100644
index 40ced261e3..0000000000
--- a/drivers/gpio/turris_omnia_mcu.c
+++ /dev/null
@@ -1,288 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-// (C) 2022 Pali Rohár <pali@kernel.org>
-
-#include <common.h>
-#include <dm.h>
-#include <i2c.h>
-#include <turris-omnia-mcu-interface.h>
-#include <asm/byteorder.h>
-#include <asm/gpio.h>
-#include <linux/log2.h>
-
-struct turris_omnia_mcu_info {
-	u32 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 and FEAT_PERIPH_MCU is set */
-	case (16 + 32 + 0) ... (16 + 32 + 15):
-		if (!(info->features & FEAT_EXT_CMDS))
-			return -EINVAL;
-		if (!(info->features & FEAT_PERIPH_MCU))
-			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);
-	u32 val32;
-	u16 val16;
-	int ret;
-
-	switch (offset) {
-	/* bank 0 */
-	case 0 ... 15:
-		ret = dm_i2c_read(dev, CMD_GET_STATUS_WORD, (void *)&val16,
-				  sizeof(val16));
-		if (ret)
-			return ret;
-
-		return !!(le16_to_cpu(val16) & BIT(offset));
-
-	/* 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, (void *)&val32,
-				  sizeof(val32));
-		if (ret)
-			return ret;
-
-		return !!(le32_to_cpu(val32) & BIT(offset - 16));
-
-	/* bank 2 - supported only when FEAT_EXT_CMDS and FEAT_PERIPH_MCU is set */
-	case (16 + 32 + 0) ... (16 + 32 + 15):
-		if (!(info->features & FEAT_EXT_CMDS))
-			return -EINVAL;
-		if (!(info->features & FEAT_PERIPH_MCU))
-			return -EINVAL;
-
-		ret = dm_i2c_read(dev, CMD_GET_EXT_CONTROL_STATUS,
-				  (void *)&val16, sizeof(val16));
-		if (ret)
-			return ret;
-
-		return !!(le16_to_cpu(val16) & BIT(offset - 16 - 32));
-
-	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);
-	u16 valmask16[2];
-	u8 valmask8[2];
-
-	switch (offset) {
-	/* bank 0 */
-	case 0 ... 15:
-		switch (offset) {
-		case ilog2(STS_USB30_PWRON):
-			valmask8[1] = CTL_USB30_PWRON;
-			break;
-		case ilog2(STS_USB31_PWRON):
-			valmask8[1] = CTL_USB31_PWRON;
-			break;
-		case ilog2(STS_ENABLE_4V5):
-			valmask8[1] = CTL_ENABLE_4V5;
-			break;
-		case ilog2(STS_BUTTON_MODE):
-			valmask8[1] = CTL_BUTTON_MODE;
-			break;
-		default:
-			return -EINVAL;
-		}
-
-		valmask8[0] = value ? valmask8[1] : 0;
-
-		return dm_i2c_write(dev, CMD_GENERAL_CONTROL, valmask8,
-				    sizeof(valmask8));
-
-	/* bank 2 - supported only when FEAT_EXT_CMDS and FEAT_PERIPH_MCU is set */
-	case (16 + 32 + 0) ... (16 + 32 + 15):
-		if (!(info->features & FEAT_EXT_CMDS))
-			return -EINVAL;
-		if (!(info->features & FEAT_PERIPH_MCU))
-			return -EINVAL;
-
-		valmask16[1] = cpu_to_le16(BIT(offset - 16 - 32));
-		valmask16[0] = value ? valmask16[1] : 0;
-
-		return dm_i2c_write(dev, CMD_EXT_CONTROL, (void *)valmask16,
-				    sizeof(valmask16));
-
-	default:
-		return -EINVAL;
-	}
-}
-
-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;
-
-	desc->offset = offset;
-	desc->flags = gpio_flags_xlate(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);
-	u32 dword;
-	u16 word;
-	int ret;
-
-	ret = dm_i2c_read(dev, CMD_GET_STATUS_WORD, (void *)&word, sizeof(word));
-	if (ret < 0) {
-		printf("Error: turris_omnia_mcu CMD_GET_STATUS_WORD failed: %d\n",
-		       ret);
-		return ret;
-	}
-
-	if (le16_to_cpu(word) & STS_FEATURES_SUPPORTED) {
-		/* try read 32-bit features */
-		ret = dm_i2c_read(dev, CMD_GET_FEATURES, (void *)&dword,
-				  sizeof(dword));
-		if (ret < 0) {
-			/* try read 16-bit features */
-			ret = dm_i2c_read(dev, CMD_GET_FEATURES, (void *)&word,
-					  sizeof(word));
-			if (ret < 0) {
-				printf("Error: turris_omnia_mcu CMD_GET_FEATURES failed: %d\n",
-				       ret);
-				return ret;
-			}
-
-			info->features = le16_to_cpu(word);
-		} else {
-			info->features = le32_to_cpu(dword);
-			if (info->features & FEAT_FROM_BIT_16_INVALID)
-				info->features &= GENMASK(15, 0);
-		}
-	}
-
-	uc_priv->bank_name = "mcu_";
-
-	if ((info->features & FEAT_EXT_CMDS) && (info->features & FEAT_PERIPH_MCU))
-		uc_priv->gpio_count = 16 + 32 + 16;
-	else if (info->features & FEAT_EXT_CMDS)
-		uc_priv->gpio_count = 16 + 32;
-	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,
-};