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

1 files changed, 232 insertions, 0 deletions

diff --git a/arch/mips/generic/yamon-dt.c b/arch/mips/generic/yamon-dt.c
new file mode 100644
index 000000000..a07a5edbc
--- /dev/null
+++ b/arch/mips/generic/yamon-dt.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ */
+
+#define pr_fmt(fmt) "yamon-dt: " fmt
+
+#include <linux/bug.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/libfdt.h>
+#include <linux/printk.h>
+
+#include <asm/fw/fw.h>
+#include <asm/yamon-dt.h>
+
+#define MAX_MEM_ARRAY_ENTRIES   2
+
+__init int yamon_dt_append_cmdline(void *fdt)
+{
+        int err, chosen_off;
+
+        /* find or add chosen node */
+        chosen_off = fdt_path_offset(fdt, "/chosen");
+        if (chosen_off == -FDT_ERR_NOTFOUND)
+                chosen_off = fdt_add_subnode(fdt, 0, "chosen");
+        if (chosen_off < 0) {
+                pr_err("Unable to find or add DT chosen node: %d\n",
+                       chosen_off);
+                return chosen_off;
+        }
+
+        err = fdt_setprop_string(fdt, chosen_off, "bootargs", fw_getcmdline());
+        if (err) {
+                pr_err("Unable to set bootargs property: %d\n", err);
+                return err;
+        }
+
+        return 0;
+}
+
+static unsigned int __init gen_fdt_mem_array(
+                                        const struct yamon_mem_region *regions,
+                                        __be32 *mem_array,
+                                        unsigned int max_entries,
+                                        unsigned long memsize)
+{
+        const struct yamon_mem_region *mr;
+        unsigned long size;
+        unsigned int entries = 0;
+
+        for (mr = regions; mr->size && memsize; ++mr) {
+                if (entries >= max_entries) {
+                        pr_warn("Number of regions exceeds max %u\n",
+                                max_entries);
+                        break;
+                }
+
+                /* How much of the remaining RAM fits in the next region? */
+                size = min_t(unsigned long, memsize, mr->size);
+                memsize -= size;
+
+                /* Emit a memory region */
+                *(mem_array++) = cpu_to_be32(mr->start);
+                *(mem_array++) = cpu_to_be32(size);
+                ++entries;
+
+                /* Discard the next mr->discard bytes */
+                memsize -= min_t(unsigned long, memsize, mr->discard);
+        }
+        return entries;
+}
+
+__init int yamon_dt_append_memory(void *fdt,
+                                  const struct yamon_mem_region *regions)
+{
+        unsigned long phys_memsize = 0, memsize;
+        __be32 mem_array[2 * MAX_MEM_ARRAY_ENTRIES];
+        unsigned int mem_entries;
+        int i, err, mem_off;
+        char *var, param_name[10], *var_names[] = {
+                "ememsize", "memsize",
+        };
+
+        /* find memory size from the bootloader environment */
+        for (i = 0; i < ARRAY_SIZE(var_names); i++) {
+                var = fw_getenv(var_names[i]);
+                if (!var)
+                        continue;
+
+                err = kstrtoul(var, 0, &phys_memsize);
+                if (!err)
+                        break;
+
+                pr_warn("Failed to read the '%s' env variable '%s'\n",
+                        var_names[i], var);
+        }
+
+        if (!phys_memsize) {
+                pr_warn("The bootloader didn't provide memsize: defaulting to 32MB\n");
+                phys_memsize = 32 << 20;
+        }
+
+        /* default to using all available RAM */
+        memsize = phys_memsize;
+
+        /* allow the user to override the usable memory */
+        for (i = 0; i < ARRAY_SIZE(var_names); i++) {
+                snprintf(param_name, sizeof(param_name), "%s=", var_names[i]);
+                var = strstr(arcs_cmdline, param_name);
+                if (!var)
+                        continue;
+
+                memsize = memparse(var + strlen(param_name), NULL);
+        }
+
+        /* if the user says there's more RAM than we thought, believe them */
+        phys_memsize = max_t(unsigned long, phys_memsize, memsize);
+
+        /* find or add a memory node */
+        mem_off = fdt_path_offset(fdt, "/memory");
+        if (mem_off == -FDT_ERR_NOTFOUND)
+                mem_off = fdt_add_subnode(fdt, 0, "memory");
+        if (mem_off < 0) {
+                pr_err("Unable to find or add memory DT node: %d\n", mem_off);
+                return mem_off;
+        }
+
+        err = fdt_setprop_string(fdt, mem_off, "device_type", "memory");
+        if (err) {
+                pr_err("Unable to set memory node device_type: %d\n", err);
+                return err;
+        }
+
+        mem_entries = gen_fdt_mem_array(regions, mem_array,
+                                        MAX_MEM_ARRAY_ENTRIES, phys_memsize);
+        err = fdt_setprop(fdt, mem_off, "reg",
+                          mem_array, mem_entries * 2 * sizeof(mem_array[0]));
+        if (err) {
+                pr_err("Unable to set memory regs property: %d\n", err);
+                return err;
+        }
+
+        mem_entries = gen_fdt_mem_array(regions, mem_array,
+                                        MAX_MEM_ARRAY_ENTRIES, memsize);
+        err = fdt_setprop(fdt, mem_off, "linux,usable-memory",
+                          mem_array, mem_entries * 2 * sizeof(mem_array[0]));
+        if (err) {
+                pr_err("Unable to set linux,usable-memory property: %d\n", err);
+                return err;
+        }
+
+        return 0;
+}
+
+__init int yamon_dt_serial_config(void *fdt)
+{
+        const char *yamontty, *mode_var;
+        char mode_var_name[9], path[20], parity;
+        unsigned int uart, baud, stop_bits;
+        bool hw_flow;
+        int chosen_off, err;
+
+        yamontty = fw_getenv("yamontty");
+        if (!yamontty || !strcmp(yamontty, "tty0")) {
+                uart = 0;
+        } else if (!strcmp(yamontty, "tty1")) {
+                uart = 1;
+        } else {
+                pr_warn("yamontty environment variable '%s' invalid\n",
+                        yamontty);
+                uart = 0;
+        }
+
+        baud = stop_bits = 0;
+        parity = 0;
+        hw_flow = false;
+
+        snprintf(mode_var_name, sizeof(mode_var_name), "modetty%u", uart);
+        mode_var = fw_getenv(mode_var_name);
+        if (mode_var) {
+                while (mode_var[0] >= '0' && mode_var[0] <= '9') {
+                        baud *= 10;
+                        baud += mode_var[0] - '0';
+                        mode_var++;
+                }
+                if (mode_var[0] == ',')
+                        mode_var++;
+                if (mode_var[0])
+                        parity = mode_var[0];
+                if (mode_var[0] == ',')
+                        mode_var++;
+                if (mode_var[0])
+                        stop_bits = mode_var[0] - '0';
+                if (mode_var[0] == ',')
+                        mode_var++;
+                if (!strcmp(mode_var, "hw"))
+                        hw_flow = true;
+        }
+
+        if (!baud)
+                baud = 38400;
+
+        if (parity != 'e' && parity != 'n' && parity != 'o')
+                parity = 'n';
+
+        if (stop_bits != 7 && stop_bits != 8)
+                stop_bits = 8;
+
+        WARN_ON(snprintf(path, sizeof(path), "serial%u:%u%c%u%s",
+                         uart, baud, parity, stop_bits,
+                         hw_flow ? "r" : "") >= sizeof(path));
+
+        /* find or add chosen node */
+        chosen_off = fdt_path_offset(fdt, "/chosen");
+        if (chosen_off == -FDT_ERR_NOTFOUND)
+                chosen_off = fdt_add_subnode(fdt, 0, "chosen");
+        if (chosen_off < 0) {
+                pr_err("Unable to find or add DT chosen node: %d\n",
+                       chosen_off);
+                return chosen_off;
+        }
+
+        err = fdt_setprop_string(fdt, chosen_off, "stdout-path", path);
+        if (err) {
+                pr_err("Unable to set stdout-path property: %d\n", err);
+                return err;
+        }
+
+        return 0;
+}