MIPS: generic: Add support for Microsemi Ocelot
Introduce support for the MIPS based Microsemi Ocelot SoCs.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Allan Nielsen <Allan.Nielsen@microsemi.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18858/
[jhogan@kernel.org: update ocelot_defconfig specification]
Signed-off-by: James Hogan <jhogan@kernel.org>
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 2ed4c89..646a2d9 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -565,6 +565,9 @@
# now that the boards have been converted to use the generic kernel they are
# wrappers around the generic rules above.
#
+legacy_defconfigs += ocelot_defconfig
+ocelot_defconfig-y := 32r2el_defconfig BOARDS=ocelot
+
legacy_defconfigs += sead3_defconfig
sead3_defconfig-y := 32r2el_defconfig BOARDS=sead-3
diff --git a/arch/mips/configs/generic/board-ocelot.config b/arch/mips/configs/generic/board-ocelot.config
new file mode 100644
index 0000000..aa81576
--- /dev/null
+++ b/arch/mips/configs/generic/board-ocelot.config
@@ -0,0 +1,35 @@
+# require CONFIG_CPU_MIPS32_R2=y
+
+CONFIG_LEGACY_BOARD_OCELOT=y
+
+CONFIG_MTD=y
+CONFIG_MTD_CMDLINE_PARTS=y
+CONFIG_MTD_BLOCK=y
+CONFIG_MTD_M25P80=y
+CONFIG_MTD_NAND=y
+CONFIG_MTD_NAND_PLATFORM=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_UBI=y
+
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+
+CONFIG_GPIO_SYSFS=y
+
+CONFIG_I2C=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_MUX=y
+
+CONFIG_SPI=y
+CONFIG_SPI_BITBANG=y
+CONFIG_SPI_DESIGNWARE=y
+CONFIG_SPI_SPIDEV=y
+
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_OCELOT_RESET=y
+
+CONFIG_MAGIC_SYSRQ=y
diff --git a/arch/mips/generic/Kconfig b/arch/mips/generic/Kconfig
index 2ff3b17..ba9b2c8c 100644
--- a/arch/mips/generic/Kconfig
+++ b/arch/mips/generic/Kconfig
@@ -27,6 +27,22 @@
Enable this to include support for booting on MIPS SEAD-3 FPGA-based
development boards, which boot using a legacy boot protocol.
+comment "MSCC Ocelot doesn't work with SEAD3 enabled"
+ depends on LEGACY_BOARD_SEAD3
+
+config LEGACY_BOARD_OCELOT
+ bool "Support MSCC Ocelot boards"
+ depends on LEGACY_BOARD_SEAD3=n
+ select LEGACY_BOARDS
+ select MSCC_OCELOT
+
+config MSCC_OCELOT
+ bool
+ select GPIOLIB
+ select MSCC_OCELOT_IRQ
+ select SYS_HAS_EARLY_PRINTK
+ select USE_GENERIC_EARLY_PRINTK_8250
+
comment "FIT/UHI Boards"
config FIT_IMAGE_FDT_BOSTON
diff --git a/arch/mips/generic/Makefile b/arch/mips/generic/Makefile
index 5c31e0c..d03a36f 100644
--- a/arch/mips/generic/Makefile
+++ b/arch/mips/generic/Makefile
@@ -14,5 +14,6 @@
obj-$(CONFIG_YAMON_DT_SHIM) += yamon-dt.o
obj-$(CONFIG_LEGACY_BOARD_SEAD3) += board-sead3.o
+obj-$(CONFIG_LEGACY_BOARD_OCELOT) += board-ocelot.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_VIRT_BOARD_RANCHU) += board-ranchu.o
diff --git a/arch/mips/generic/board-ocelot.c b/arch/mips/generic/board-ocelot.c
new file mode 100644
index 0000000..06d92fb
--- /dev/null
+++ b/arch/mips/generic/board-ocelot.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Microsemi MIPS SoC support
+ *
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+#include <asm/machine.h>
+#include <asm/prom.h>
+
+#define DEVCPU_GCB_CHIP_REGS_CHIP_ID 0x71070000
+#define CHIP_ID_PART_ID GENMASK(27, 12)
+
+#define OCELOT_PART_ID (0x7514 << 12)
+
+#define UART_UART 0x70100000
+
+static __init bool ocelot_detect(void)
+{
+ u32 rev;
+ int idx;
+
+ /* Look for the TLB entry set up by redboot before trying to use it */
+ write_c0_entryhi(DEVCPU_GCB_CHIP_REGS_CHIP_ID);
+ mtc0_tlbw_hazard();
+ tlb_probe();
+ tlb_probe_hazard();
+ idx = read_c0_index();
+ if (idx < 0)
+ return 0;
+
+ /* A TLB entry exists, lets assume its usable and check the CHIP ID */
+ rev = __raw_readl((void __iomem *)DEVCPU_GCB_CHIP_REGS_CHIP_ID);
+
+ if ((rev & CHIP_ID_PART_ID) != OCELOT_PART_ID)
+ return 0;
+
+ /* Copy command line from bootloader early for Initrd detection */
+ if (fw_arg0 < 10 && (fw_arg1 & 0xFFF00000) == 0x80000000) {
+ unsigned int prom_argc = fw_arg0;
+ const char **prom_argv = (const char **)fw_arg1;
+
+ if (prom_argc > 1 && strlen(prom_argv[1]) > 0)
+ /* ignore all built-in args if any f/w args given */
+ strcpy(arcs_cmdline, prom_argv[1]);
+ }
+
+ return 1;
+}
+
+static void __init ocelot_earlyprintk_init(void)
+{
+ void __iomem *uart_base;
+
+ uart_base = ioremap_nocache(UART_UART, 0x20);
+ setup_8250_early_printk_port((unsigned long)uart_base, 2, 50000);
+}
+
+static void __init ocelot_late_init(void)
+{
+ ocelot_earlyprintk_init();
+}
+
+static __init const void *ocelot_fixup_fdt(const void *fdt,
+ const void *match_data)
+{
+ /* This has to be done so late because ioremap needs to work */
+ late_time_init = ocelot_late_init;
+
+ return fdt;
+}
+
+extern char __dtb_ocelot_pcb123_begin[];
+
+MIPS_MACHINE(ocelot) = {
+ .fdt = __dtb_ocelot_pcb123_begin,
+ .fixup_fdt = ocelot_fixup_fdt,
+ .detect = ocelot_detect,
+};