Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/mips/generic/board-ocelot.c b/arch/mips/generic/board-ocelot.c
new file mode 100644
index 000000000..c238e9519
--- /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(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,
+};