remoteproc: Add BL808 remoteproc driver

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

drivers/remoteproc/Kconfig

@@ -22,6 +22,16 @@ config K3_SYSTEM_CONTROLLER
 	help
 	  Say 'y' here to add support for TI' K3 System Controller.
 
+config REMOTEPROC_BFLB
+	bool "Support for Bouffalo Lab BL808 remoteproc support"
+	select REMOTEPROC
+	depends on DM
+	depends on TARGET_BOUFFALO_BL808
+	depends on OF_CONTROL
+	help
+	  Say 'y' here to add support for the booting the processors
+	  in the Bouffalo Lab BL808 SoC.
+
 config REMOTEPROC_SANDBOX
 	bool "Support for Test processor for Sandbox"
 	select REMOTEPROC

drivers/remoteproc/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_$(SPL_)REMOTEPROC) += rproc-uclass.o rproc-elf-loader.o
 
 # Remote proc drivers - Please keep this list alphabetically sorted.
 obj-$(CONFIG_K3_SYSTEM_CONTROLLER) += k3_system_controller.o
+obj-$(CONFIG_REMOTEPROC_BFLB) += bflb_rproc.o
 obj-$(CONFIG_REMOTEPROC_SANDBOX) += sandbox_testproc.o
 obj-$(CONFIG_REMOTEPROC_STM32_COPRO) += stm32_copro.o
 obj-$(CONFIG_REMOTEPROC_TI_K3_ARM64) += ti_k3_arm64_rproc.o

drivers/remoteproc/bflb_rproc.c

@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <clk.h>
+#include <dm.h>
+#include <remoteproc.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <bl808/mm_misc_reg.h>
+
+struct bflb_rproc_plat {
+	void __iomem		*base;
+	struct clk		clk;
+	struct reset_ctl	reset;
+};
+
+static int bflb_rproc_init(struct udevice *dev)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+
+	clk_set_rate(&plat->clk, 240000000);
+
+	return 0;
+}
+
+static int bflb_rproc_load(struct udevice *dev, ulong addr, ulong size)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+
+	/* Set the CPU entry point. */
+	writel(rproc_elf_get_boot_addr(dev, addr),
+	       plat->base + MM_MISC_CPU0_BOOT_OFFSET);
+
+	return rproc_elf_load_image(dev, addr, size);
+}
+
+static int bflb_rproc_start(struct udevice *dev)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+	int ret;
+
+	reset_assert(&plat->reset);
+
+	ret = clk_enable(&plat->clk);
+	if (ret)
+		return ret;
+
+	/* Set up the CPU time base. */
+	u32 divider = clk_get_rate(&plat->clk) / 1000000;
+	writel(divider | MM_MISC_C906_RTC_RST_MSK,
+	       plat->base + MM_MISC_CPU_RTC_OFFSET);
+	writel(divider | MM_MISC_C906_RTC_EN_MSK,
+	       plat->base + MM_MISC_CPU_RTC_OFFSET);
+
+	ret = reset_deassert(&plat->reset);
+	if (ret)
+		goto err_disable_clk;
+
+	return 0;
+
+err_disable_clk:
+	clk_disable(&plat->clk);
+
+	return ret;
+}
+
+static int bflb_rproc_stop(struct udevice *dev)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+
+	reset_assert(&plat->reset);
+	clk_disable(&plat->clk);
+
+	return 0;
+}
+
+static int bflb_rproc_reset(struct udevice *dev)
+{
+	bflb_rproc_stop(dev);
+
+	return bflb_rproc_start(dev);
+}
+
+static int bflb_rproc_is_running(struct udevice *dev)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+
+	return reset_status(&plat->reset);
+}
+
+static const struct dm_rproc_ops bflb_rproc_ops = {
+	.init		= bflb_rproc_init,
+	.load		= bflb_rproc_load,
+	.start		= bflb_rproc_start,
+	.stop		= bflb_rproc_stop,
+	.reset		= bflb_rproc_reset,
+	.is_running	= bflb_rproc_is_running,
+};
+
+static int bflb_rproc_of_to_plat(struct udevice *dev)
+{
+	struct bflb_rproc_plat *plat = dev_get_plat(dev);
+	int ret;
+
+	plat->base = dev_remap_addr(dev);
+	if (!plat->base)
+		return -ENOMEM;
+
+	ret = clk_get_by_index(dev, 0, &plat->clk);
+	if (ret)
+		return ret;
+
+	ret = reset_get_by_index(dev, 0, &plat->reset);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct udevice_id bflb_rproc_ids[] = {
+	{ .compatible = "bflb,bl808-mm-misc" },
+	{ }
+};
+
+U_BOOT_DRIVER(bflb_rproc) = {
+	.name		= "bflb_rproc",
+	.id		= UCLASS_REMOTEPROC,
+	.of_match	= bflb_rproc_ids,
+	.of_to_plat	= bflb_rproc_of_to_plat,
+	.plat_auto	= sizeof(struct bflb_rproc_plat),
+	.ops		= &bflb_rproc_ops,
+};