1 files changed, 283 insertions, 0 deletions

diff --git a/arch/powerpc/boot/of.c b/arch/powerpc/boot/of.c
new file mode 100644
index 000000000000..fd99f789a37b
--- /dev/null
+++ b/arch/powerpc/boot/of.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "elf.h"
+#include "string.h"
+#include "stdio.h"
+#include "page.h"
+#include "ops.h"
+
+typedef void *ihandle;
+typedef void *phandle;
+
+extern char _end[];
+
+/* Value picked to match that used by yaboot */
+#define PROG_START      0x01400000      /* only used on 64-bit systems */
+#define RAM_END         (512<<20)       /* Fixme: use OF */
+#define ONE_MB          0x100000
+
+int (*prom) (void *);
+
+
+static unsigned long claim_base;
+
+static int call_prom(const char *service, int nargs, int nret, ...)
+{
+        int i;
+        struct prom_args {
+                const char *service;
+                int nargs;
+                int nret;
+                unsigned int args[12];
+        } args;
+        va_list list;
+
+        args.service = service;
+        args.nargs = nargs;
+        args.nret = nret;
+
+        va_start(list, nret);
+        for (i = 0; i < nargs; i++)
+                args.args[i] = va_arg(list, unsigned int);
+        va_end(list);
+
+        for (i = 0; i < nret; i++)
+                args.args[nargs+i] = 0;
+
+        if (prom(&args) < 0)
+                return -1;
+
+        return (nret > 0)? args.args[nargs]: 0;
+}
+
+static int call_prom_ret(const char *service, int nargs, int nret,
+                  unsigned int *rets, ...)
+{
+        int i;
+        struct prom_args {
+                const char *service;
+                int nargs;
+                int nret;
+                unsigned int args[12];
+        } args;
+        va_list list;
+
+        args.service = service;
+        args.nargs = nargs;
+        args.nret = nret;
+
+        va_start(list, rets);
+        for (i = 0; i < nargs; i++)
+                args.args[i] = va_arg(list, unsigned int);
+        va_end(list);
+
+        for (i = 0; i < nret; i++)
+                args.args[nargs+i] = 0;
+
+        if (prom(&args) < 0)
+                return -1;
+
+        if (rets != (void *) 0)
+                for (i = 1; i < nret; ++i)
+                        rets[i-1] = args.args[nargs+i];
+
+        return (nret > 0)? args.args[nargs]: 0;
+}
+
+/*
+ * Older OF's require that when claiming a specific range of addresses,
+ * we claim the physical space in the /memory node and the virtual
+ * space in the chosen mmu node, and then do a map operation to
+ * map virtual to physical.
+ */
+static int need_map = -1;
+static ihandle chosen_mmu;
+static phandle memory;
+
+/* returns true if s2 is a prefix of s1 */
+static int string_match(const char *s1, const char *s2)
+{
+        for (; *s2; ++s2)
+                if (*s1++ != *s2)
+                        return 0;
+        return 1;
+}
+
+static int check_of_version(void)
+{
+        phandle oprom, chosen;
+        char version[64];
+
+        oprom = finddevice("/openprom");
+        if (oprom == (phandle) -1)
+                return 0;
+        if (getprop(oprom, "model", version, sizeof(version)) <= 0)
+                return 0;
+        version[sizeof(version)-1] = 0;
+        printf("OF version = '%s'\r\n", version);
+        if (!string_match(version, "Open Firmware, 1.")
+            && !string_match(version, "FirmWorks,3."))
+                return 0;
+        chosen = finddevice("/chosen");
+        if (chosen == (phandle) -1) {
+                chosen = finddevice("/chosen@0");
+                if (chosen == (phandle) -1) {
+                        printf("no chosen\n");
+                        return 0;
+                }
+        }
+        if (getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
+                printf("no mmu\n");
+                return 0;
+        }
+        memory = (ihandle) call_prom("open", 1, 1, "/memory");
+        if (memory == (ihandle) -1) {
+                memory = (ihandle) call_prom("open", 1, 1, "/memory@0");
+                if (memory == (ihandle) -1) {
+                        printf("no memory node\n");
+                        return 0;
+                }
+        }
+        printf("old OF detected\r\n");
+        return 1;
+}
+
+static void *claim(unsigned long virt, unsigned long size, unsigned long align)
+{
+        int ret;
+        unsigned int result;
+
+        if (need_map < 0)
+                need_map = check_of_version();
+        if (align || !need_map)
+                return (void *) call_prom("claim", 3, 1, virt, size, align);
+
+        ret = call_prom_ret("call-method", 5, 2, &result, "claim", memory,
+                            align, size, virt);
+        if (ret != 0 || result == -1)
+                return (void *) -1;
+        ret = call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
+                            align, size, virt);
+        /* 0x12 == coherent + read/write */
+        ret = call_prom("call-method", 6, 1, "map", chosen_mmu,
+                        0x12, size, virt, virt);
+        return (void *) virt;
+}
+
+static void *of_try_claim(u32 size)
+{
+        unsigned long addr = 0;
+        static u8 first_time = 1;
+
+        if (first_time) {
+                claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
+                first_time = 0;
+        }
+
+        for(; claim_base < RAM_END; claim_base += ONE_MB) {
+#ifdef DEBUG
+                printf("    trying: 0x%08lx\n\r", claim_base);
+#endif
+                addr = (unsigned long)claim(claim_base, size, 0);
+                if ((void *)addr != (void *)-1)
+                        break;
+        }
+        if (addr == 0)
+                return NULL;
+        claim_base = PAGE_ALIGN(claim_base + size);
+        return (void *)addr;
+}
+
+static void of_image_hdr(const void *hdr)
+{
+        const Elf64_Ehdr *elf64 = hdr;
+
+        if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
+                /*
+                 * Maintain a "magic" minimum address. This keeps some older
+                 * firmware platforms running.
+                 */
+                if (claim_base < PROG_START)
+                        claim_base = PROG_START;
+        }
+}
+
+static void of_exit(void)
+{
+        call_prom("exit", 0, 0);
+}
+
+/*
+ * OF device tree routines
+ */
+static void *of_finddevice(const char *name)
+{
+        return (phandle) call_prom("finddevice", 1, 1, name);
+}
+
+static int of_getprop(const void *phandle, const char *name, void *buf,
+                const int buflen)
+{
+        return call_prom("getprop", 4, 1, phandle, name, buf, buflen);
+}
+
+static int of_setprop(const void *phandle, const char *name, const void *buf,
+                const int buflen)
+{
+        return call_prom("setprop", 4, 1, phandle, name, buf, buflen);
+}
+
+/*
+ * OF console routines
+ */
+static void *of_stdout_handle;
+
+static int of_console_open(void)
+{
+        void *devp;
+
+        if (((devp = finddevice("/chosen")) != NULL)
+                        && (getprop(devp, "stdout", &of_stdout_handle,
+                                sizeof(of_stdout_handle))
+                                == sizeof(of_stdout_handle)))
+                return 0;
+
+        return -1;
+}
+
+static void of_console_write(char *buf, int len)
+{
+        call_prom("write", 3, 1, of_stdout_handle, buf, len);
+}
+
+int platform_init(void *promptr)
+{
+        platform_ops.fixups = NULL;
+        platform_ops.image_hdr = of_image_hdr;
+        platform_ops.malloc = of_try_claim;
+        platform_ops.free = NULL;
+        platform_ops.exit = of_exit;
+
+        dt_ops.finddevice = of_finddevice;
+        dt_ops.getprop = of_getprop;
+        dt_ops.setprop = of_setprop;
+        dt_ops.translate_addr = NULL;
+
+        console_ops.open = of_console_open;
+        console_ops.write = of_console_write;
+        console_ops.edit_cmdline = NULL;
+        console_ops.close = NULL;
+        console_ops.data = NULL;
+
+        prom = (int (*)(void *))promptr;
+        return 0;
+}