RISC-V: sifive: add HiFive board support

With the recently added SiFive support, we now have enough functionality
to boot a HiFive board to shell:

  qemu-system-riscv64 -M sifive_u serial_stdio \
  -kernel./images/barebox-hifive-unleashed.img

Some more drivers need to be ported for this to be useful:

  - sifive,spi0		needed for talking to SD-Card
  - clocksource		The riscv-timer seems to be 10x too fast

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210427202309.32077-12-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

9 files changed, 198 insertions, 0 deletions

diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
index ea5ae0a6e9..c6875738d0 100644
--- a/arch/riscv/Kconfig.socs
+++ b/arch/riscv/Kconfig.socs
@@ -21,4 +21,23 @@ config SOC_VIRT
 	  Generates an image tht can be be booted by QEMU. The image is called
 	  barebox-dt-2nd.img
 
+config SOC_SIFIVE
+	bool "SiFive SoCs"
+	select CLK_SIFIVE
+	select CLK_SIFIVE_PRCI
+	select RISCV_TIMER
+	select HAS_MACB
+	select HAS_ASM_DEBUG_LL
+	help
+	  This enables support for SiFive SoC platform hardware.
+
+if SOC_SIFIVE
+
+config BOARD_HIFIVE
+	bool "HiFive"
+	depends on ARCH_RV64I
+	select USE_COMPRESSED_DTB
+
+endif
+
 endmenu
diff --git a/arch/riscv/boards/Makefile b/arch/riscv/boards/Makefile
index 2ce9af41e0..99f22f32b4 100644
--- a/arch/riscv/boards/Makefile
+++ b/arch/riscv/boards/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_BOARD_ERIZO_GENERIC)	+= erizo/
+obj-$(CONFIG_BOARD_HIFIVE)		+= hifive/
diff --git a/arch/riscv/boards/hifive/Makefile b/arch/riscv/boards/hifive/Makefile
new file mode 100644
index 0000000000..3d217ffe0b
--- /dev/null
+++ b/arch/riscv/boards/hifive/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+pbl-y += lowlevel.o
diff --git a/arch/riscv/boards/hifive/lowlevel.c b/arch/riscv/boards/hifive/lowlevel.c
new file mode 100644
index 0000000000..1de13cac16
--- /dev/null
+++ b/arch/riscv/boards/hifive/lowlevel.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <asm/barebox-riscv.h>
+#include <debug_ll.h>
+
+ENTRY_FUNCTION(start_hifive_unmatched, a0, a1, a2)
+{
+	extern char __dtb_z_hifive_unmatched_a00_start[];
+
+	putc_ll('>');
+
+	barebox_riscv_entry(0x80000000, SZ_128M,
+			    __dtb_z_hifive_unmatched_a00_start + get_runtime_offset());
+}
+
+ENTRY_FUNCTION(start_hifive_unleashed, a0, a1, a2)
+{
+	extern char __dtb_z_hifive_unleashed_a00_start[];
+
+	putc_ll('>');
+
+	barebox_riscv_entry(0x80000000, SZ_128M,
+			    __dtb_z_hifive_unleashed_a00_start + get_runtime_offset());
+}
diff --git a/arch/riscv/configs/sifive_defconfig b/arch/riscv/configs/sifive_defconfig
new file mode 100644
index 0000000000..59cfebf194
--- /dev/null
+++ b/arch/riscv/configs/sifive_defconfig
@@ -0,0 +1,128 @@
+CONFIG_ARCH_RV64I=y
+CONFIG_SOC_SIFIVE=y
+CONFIG_BOARD_HIFIVE=y
+CONFIG_BOARD_RISCV_GENERIC_DT=y
+CONFIG_RISCV_OPTIMZED_STRING_FUNCTIONS=y
+CONFIG_STACK_SIZE=0x20000
+CONFIG_MALLOC_SIZE=0x0
+CONFIG_MALLOC_TLSF=y
+CONFIG_KALLSYMS=y
+CONFIG_RELOCATABLE=y
+CONFIG_PANIC_HANG=y
+CONFIG_HUSH_FANCY_PROMPT=y
+CONFIG_CMDLINE_EDITING=y
+CONFIG_AUTO_COMPLETE=y
+CONFIG_MENU=y
+CONFIG_IMD_TARGET=y
+CONFIG_CONSOLE_ALLOW_COLOR=y
+CONFIG_PBL_CONSOLE=y
+CONFIG_PARTITION_DISK_EFI=y
+CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW=y
+CONFIG_BAREBOXENV_TARGET=y
+CONFIG_BAREBOXCRC32_TARGET=y
+CONFIG_STATE=y
+CONFIG_STATE_CRYPTO=y
+CONFIG_BOOTCHOOSER=y
+CONFIG_RESET_SOURCE=y
+CONFIG_MACHINE_ID=y
+CONFIG_CMD_DMESG=y
+CONFIG_LONGHELP=y
+CONFIG_CMD_IOMEM=y
+CONFIG_CMD_IMD=y
+CONFIG_CMD_MEMINFO=y
+CONFIG_CMD_POLLER=y
+CONFIG_CMD_SLICE=y
+CONFIG_CMD_GO=y
+CONFIG_CMD_LOADY=y
+CONFIG_CMD_RESET=y
+CONFIG_CMD_BOOTCHOOSER=y
+CONFIG_CMD_EXPORT=y
+CONFIG_CMD_PRINTENV=y
+CONFIG_CMD_MAGICVAR=y
+CONFIG_CMD_MAGICVAR_HELP=y
+CONFIG_CMD_SAVEENV=y
+CONFIG_CMD_CMP=y
+CONFIG_CMD_FILETYPE=y
+CONFIG_CMD_LN=y
+CONFIG_CMD_MD5SUM=y
+CONFIG_CMD_SHA1SUM=y
+CONFIG_CMD_SHA256SUM=y
+CONFIG_CMD_MSLEEP=y
+CONFIG_CMD_SLEEP=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MIITOOL=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_EDIT=y
+CONFIG_CMD_SPLASH=y
+CONFIG_CMD_FBTEST=y
+CONFIG_CMD_READLINE=y
+CONFIG_CMD_TIMEOUT=y
+CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_MM=y
+CONFIG_CMD_CLK=y
+CONFIG_CMD_DETECT=y
+CONFIG_CMD_FLASH=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_POWEROFF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_2048=y
+CONFIG_CMD_BAREBOX_UPDATE=y
+CONFIG_CMD_OF_DIFF=y
+CONFIG_CMD_OF_NODE=y
+CONFIG_CMD_OF_PROPERTY=y
+CONFIG_CMD_OF_DISPLAY_TIMINGS=y
+CONFIG_CMD_OF_FIXUP_STATUS=y
+CONFIG_CMD_OF_OVERLAY=y
+CONFIG_CMD_OFTREE=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_DHRYSTONE=y
+CONFIG_NET=y
+CONFIG_NET_NFS=y
+CONFIG_NET_FASTBOOT=y
+CONFIG_DRIVER_SERIAL_NS16550=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_SERIAL_SIFIVE=y
+CONFIG_DRIVER_NET_MACB=y
+CONFIG_DRIVER_SPI_GPIO=y
+CONFIG_I2C=y
+CONFIG_I2C_GPIO=y
+CONFIG_MTD=y
+# CONFIG_MTD_OOB_DEVICE is not set
+CONFIG_MTD_CONCAT=y
+CONFIG_MTD_M25P80=y
+CONFIG_DRIVER_CFI=y
+CONFIG_DRIVER_CFI_BANK_WIDTH_8=y
+CONFIG_DISK=y
+CONFIG_DISK_WRITE=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIDEO=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_DRIVER_VIDEO_SIMPLEFB_CLIENT=y
+CONFIG_CLOCKSOURCE_DUMMY_RATE=60000
+CONFIG_EEPROM_AT24=y
+CONFIG_HWRNG=y
+CONFIG_HW_RANDOM_VIRTIO=y
+CONFIG_GPIO_SIFIVE=y
+# CONFIG_PINCTRL is not set
+CONFIG_SYSCON_REBOOT_MODE=y
+CONFIG_POWER_RESET_SYSCON=y
+CONFIG_POWER_RESET_SYSCON_POWEROFF=y
+CONFIG_POWER_RESET_GPIO_RESTART=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_FS_EXT4=y
+CONFIG_FS_TFTP=y
+CONFIG_FS_NFS=y
+CONFIG_FS_FAT=y
+CONFIG_FS_FAT_WRITE=y
+CONFIG_FS_FAT_LFN=y
+CONFIG_FS_UIMAGEFS=y
+CONFIG_FS_PSTORE=y
+CONFIG_FS_SQUASHFS=y
+CONFIG_ZLIB=y
+CONFIG_BZLIB=y
+CONFIG_LZ4_DECOMPRESS=y
+CONFIG_ZSTD_DECOMPRESS=y
+CONFIG_XZ_DECOMPRESS=y
+CONFIG_BASE64=y
+CONFIG_DIGEST_CRC32_GENERIC=y
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index 4041c34e0c..17fdc9445b 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -5,5 +5,7 @@
 obj- += dummy.o
 
 pbl-$(CONFIG_BOARD_ERIZO_GENERIC) += erizo-generic.dtb.o
+pbl-$(CONFIG_BOARD_HIFIVE) += hifive-unmatched-a00.dtb.o \
+                              hifive-unleashed-a00.dtb.o
 
 clean-files := *.dtb *.dtb.S .*.dtc .*.pre .*.dts
diff --git a/arch/riscv/dts/hifive-unleashed-a00.dts b/arch/riscv/dts/hifive-unleashed-a00.dts
new file mode 100644
index 0000000000..65694bfd24
--- /dev/null
+++ b/arch/riscv/dts/hifive-unleashed-a00.dts
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0 OR X11 */
+
+#include <riscv/sifive/hifive-unleashed-a00.dts>
diff --git a/arch/riscv/dts/hifive-unmatched-a00.dts b/arch/riscv/dts/hifive-unmatched-a00.dts
new file mode 100644
index 0000000000..b8793e9105
--- /dev/null
+++ b/arch/riscv/dts/hifive-unmatched-a00.dts
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0 OR X11 */
+
+#include <riscv/sifive/hifive-unmatched-a00.dts>
diff --git a/arch/riscv/include/asm/debug_ll.h b/arch/riscv/include/asm/debug_ll.h
index 598921910a..6904460af9 100644
--- a/arch/riscv/include/asm/debug_ll.h
+++ b/arch/riscv/include/asm/debug_ll.h
@@ -24,6 +24,20 @@
 
 #include <asm/debug_ll_ns16550.h>
 
+#elif defined CONFIG_DEBUG_SIFIVE
+
+#include <io.h>
+
+static inline void PUTC_LL(char ch)
+{
+	void __iomem *uart0 = IOMEM(0x10010000);
+
+	while (readl(uart0) & 0x80000000)
+		;
+
+	writel(ch, uart0);
+}
+
 #endif
 
 #ifndef debug_ll_init