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

1 files changed, 130 insertions, 0 deletions

diff --git a/arch/mips/rb532/prom.c b/arch/mips/rb532/prom.c
new file mode 100644
index 000000000..a9d1f2019
--- /dev/null
+++ b/arch/mips/rb532/prom.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  RouterBoard 500 specific prom routines
+ *
+ *  Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
+ *  Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
+ *  Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
+ *                      Felix Fietkau <nbd@openwrt.org>
+ *                      Florian Fainelli <florian@openwrt.org>
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/console.h>
+#include <linux/memblock.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+
+#include <asm/bootinfo.h>
+#include <asm/mach-rc32434/ddr.h>
+#include <asm/mach-rc32434/prom.h>
+
+unsigned int idt_cpu_freq = 132000000;
+EXPORT_SYMBOL(idt_cpu_freq);
+
+static struct resource ddr_reg[] = {
+        {
+                .name = "ddr-reg",
+                .start = DDR0_PHYS_ADDR,
+                .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
+                .flags = IORESOURCE_MEM,
+        }
+};
+
+void __init prom_free_prom_memory(void)
+{
+        /* No prom memory to free */
+}
+
+static inline int match_tag(char *arg, const char *tag)
+{
+        return strncmp(arg, tag, strlen(tag)) == 0;
+}
+
+static inline unsigned long tag2ul(char *arg, const char *tag)
+{
+        char *num;
+
+        num = arg + strlen(tag);
+        return simple_strtoul(num, 0, 10);
+}
+
+void __init prom_setup_cmdline(void)
+{
+        static char cmd_line[COMMAND_LINE_SIZE] __initdata;
+        char *cp, *board;
+        int prom_argc;
+        char **prom_argv;
+        int i;
+
+        prom_argc = fw_arg0;
+        prom_argv = (char **) fw_arg1;
+
+        cp = cmd_line;
+                /* Note: it is common that parameters start
+                 * at argv[1] and not argv[0],
+                 * however, our elf loader starts at [0] */
+        for (i = 0; i < prom_argc; i++) {
+                if (match_tag(prom_argv[i], FREQ_TAG)) {
+                        idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
+                        continue;
+                }
+#ifdef IGNORE_CMDLINE_MEM
+                /* parses out the "mem=xx" arg */
+                if (match_tag(prom_argv[i], MEM_TAG))
+                        continue;
+#endif
+                if (i > 0)
+                        *(cp++) = ' ';
+                if (match_tag(prom_argv[i], BOARD_TAG)) {
+                        board = prom_argv[i] + strlen(BOARD_TAG);
+
+                        if (match_tag(board, BOARD_RB532A))
+                                mips_machtype = MACH_MIKROTIK_RB532A;
+                        else
+                                mips_machtype = MACH_MIKROTIK_RB532;
+                }
+
+                strcpy(cp, prom_argv[i]);
+                cp += strlen(prom_argv[i]);
+        }
+        *(cp++) = ' ';
+
+        i = strlen(arcs_cmdline);
+        if (i > 0) {
+                *(cp++) = ' ';
+                strcpy(cp, arcs_cmdline);
+                cp += strlen(arcs_cmdline);
+        }
+        cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+        strcpy(arcs_cmdline, cmd_line);
+}
+
+void __init prom_init(void)
+{
+        struct ddr_ram __iomem *ddr;
+        phys_addr_t memsize;
+        phys_addr_t ddrbase;
+
+        ddr = ioremap(ddr_reg[0].start,
+                        ddr_reg[0].end - ddr_reg[0].start);
+
+        if (!ddr) {
+                printk(KERN_ERR "Unable to remap DDR register\n");
+                return;
+        }
+
+        ddrbase = (phys_addr_t)&ddr->ddrbase;
+        memsize = (phys_addr_t)&ddr->ddrmask;
+        memsize = 0 - memsize;
+
+        prom_setup_cmdline();
+
+        /* give all RAM to boot allocator,
+         * except for the first 0x400 and the last 0x200 bytes */
+        memblock_add(ddrbase + 0x400, memsize - 0x600);
+}