sysreset: Add BL808 sysreset driver

Signed-off-by: Samuel Holland <samuel@sholland.org>

drivers/sysreset/Kconfig

@@ -66,6 +66,12 @@ config POWEROFF_GPIO
 	  Support for system poweroff using a GPIO pin. This can be used
 	  for systems having a single GPIO to trigger a system poweroff.
 
+config SYSRESET_BL808
+	bool "Enable support for BL808 system reset"
+	depends on TARGET_BOUFFALO_BL808
+	help
+	  This enables the system reset driver support for the BL808 SoC.
+
 config SYSRESET_GPIO
 	bool "Enable support for GPIO reset driver"
 	select DM_GPIO

drivers/sysreset/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += sysreset_rockchip.o
 obj-$(CONFIG_ARCH_STI) += sysreset_sti.o
 obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
 obj-$(CONFIG_POWEROFF_GPIO) += poweroff_gpio.o
+obj-$(CONFIG_SYSRESET_BL808) += sysreset_bl808.o
 obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o
 obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o
 obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o

drivers/sysreset/sysreset_bl808.c

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <dm.h>
+#include <sysreset.h>
+#include <asm/io.h>
+#include <bl808/glb_reg.h>
+
+struct bl808_sysreset_plat {
+	void *base;
+};
+
+static int bl808_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct bl808_sysreset_plat *plat = dev_get_plat(dev);
+	
+	setbits_le32(plat->base + GLB_SWRST_CFG2_OFFSET,
+		     GLB_REG_CTRL_PWRON_RST_MSK);
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops bl808_sysreset_ops = {
+	.request = bl808_sysreset_request,
+};
+
+static int bl808_sysreset_of_to_plat(struct udevice *dev)
+{
+	struct bl808_sysreset_plat *plat = dev_get_plat(dev);
+
+	plat->base = dev_read_addr_ptr(dev);
+	if (!plat->base)
+		return -ENOMEM;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(bl808_sysreset) = {
+	.name		= "bl808_sysreset",
+	.id		= UCLASS_SYSRESET,
+	.of_to_plat	= bl808_sysreset_of_to_plat,
+	.ops		= &bl808_sysreset_ops,
+};