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authorPaul Mackerras <paulus@samba.org>2005-11-09 20:00:55 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-09 20:00:55 -0500
commita23414beb6607dfd40d3245f7df9dd97a4e2c82b (patch)
tree7fb2e368a462fab4ce4cc275281ecd22e284653a /arch/ppc/boot/of1275
parent8b553f32db3bf5d0ec0819c595932eb21cd45945 (diff)
ppc/powerpc: workarounds for old Open Firmware versions
This adds code to work around some problems with old versions of Open Firmware, such as on the early powermacs (7500 etc.) and the "Longtrail" CHRP machine. On these machines we have to claim the physical and virtual address ranges explicitly when claiming memory and then set up a V->P mapping. The Longtrail has more problems: setprop doesn't work, and we have to set an "allow-reclaim" variable to 0 in order to get claim on physical memory ranges to fail if the memory is already claimed. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc/boot/of1275')
-rw-r--r--arch/ppc/boot/of1275/Makefile2
-rw-r--r--arch/ppc/boot/of1275/call_prom.c74
-rw-r--r--arch/ppc/boot/of1275/claim.c97
-rw-r--r--arch/ppc/boot/of1275/finddevice.c19
4 files changed, 154 insertions, 38 deletions
diff --git a/arch/ppc/boot/of1275/Makefile b/arch/ppc/boot/of1275/Makefile
index 02e6f235d7cb..0b979c004972 100644
--- a/arch/ppc/boot/of1275/Makefile
+++ b/arch/ppc/boot/of1275/Makefile
@@ -3,4 +3,4 @@
3# 3#
4 4
5lib-y := claim.o enter.o exit.o finddevice.o getprop.o ofinit.o \ 5lib-y := claim.o enter.o exit.o finddevice.o getprop.o ofinit.o \
6 ofstdio.o read.o release.o write.o map.o 6 ofstdio.o read.o release.o write.o map.o call_prom.o
diff --git a/arch/ppc/boot/of1275/call_prom.c b/arch/ppc/boot/of1275/call_prom.c
new file mode 100644
index 000000000000..9479a3a2b8c7
--- /dev/null
+++ b/arch/ppc/boot/of1275/call_prom.c
@@ -0,0 +1,74 @@
1/*
2 * Copyright (C) 1996-2005 Paul Mackerras.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include "of1275.h"
11#include <stdarg.h>
12
13int call_prom(const char *service, int nargs, int nret, ...)
14{
15 int i;
16 struct prom_args {
17 const char *service;
18 int nargs;
19 int nret;
20 unsigned int args[12];
21 } args;
22 va_list list;
23
24 args.service = service;
25 args.nargs = nargs;
26 args.nret = nret;
27
28 va_start(list, nret);
29 for (i = 0; i < nargs; i++)
30 args.args[i] = va_arg(list, unsigned int);
31 va_end(list);
32
33 for (i = 0; i < nret; i++)
34 args.args[nargs+i] = 0;
35
36 if (of_prom_entry(&args) < 0)
37 return -1;
38
39 return (nret > 0)? args.args[nargs]: 0;
40}
41
42int call_prom_ret(const char *service, int nargs, int nret,
43 unsigned int *rets, ...)
44{
45 int i;
46 struct prom_args {
47 const char *service;
48 int nargs;
49 int nret;
50 unsigned int args[12];
51 } args;
52 va_list list;
53
54 args.service = service;
55 args.nargs = nargs;
56 args.nret = nret;
57
58 va_start(list, rets);
59 for (i = 0; i < nargs; i++)
60 args.args[i] = va_arg(list, unsigned int);
61 va_end(list);
62
63 for (i = 0; i < nret; i++)
64 args.args[nargs+i] = 0;
65
66 if (of_prom_entry(&args) < 0)
67 return -1;
68
69 if (rets != (void *) 0)
70 for (i = 1; i < nret; ++i)
71 rets[i-1] = args.args[nargs+i];
72
73 return (nret > 0)? args.args[nargs]: 0;
74}
diff --git a/arch/ppc/boot/of1275/claim.c b/arch/ppc/boot/of1275/claim.c
index 13169a5c4339..1ed3aeeff8ae 100644
--- a/arch/ppc/boot/of1275/claim.c
+++ b/arch/ppc/boot/of1275/claim.c
@@ -9,27 +9,84 @@
9 */ 9 */
10 10
11#include "of1275.h" 11#include "of1275.h"
12#include "nonstdio.h"
12 13
13void * 14/*
14claim(unsigned int virt, unsigned int size, unsigned int align) 15 * Older OF's require that when claiming a specific range of addresses,
16 * we claim the physical space in the /memory node and the virtual
17 * space in the chosen mmu node, and then do a map operation to
18 * map virtual to physical.
19 */
20static int need_map = -1;
21static ihandle chosen_mmu;
22static phandle memory;
23
24/* returns true if s2 is a prefix of s1 */
25static int string_match(const char *s1, const char *s2)
26{
27 for (; *s2; ++s2)
28 if (*s1++ != *s2)
29 return 0;
30 return 1;
31}
32
33static int check_of_version(void)
34{
35 phandle oprom, chosen;
36 char version[64];
37
38 oprom = finddevice("/openprom");
39 if (oprom == OF_INVALID_HANDLE)
40 return 0;
41 if (getprop(oprom, "model", version, sizeof(version)) <= 0)
42 return 0;
43 version[sizeof(version)-1] = 0;
44 printf("OF version = '%s'\n", version);
45 if (!string_match(version, "Open Firmware, 1.")
46 && !string_match(version, "FirmWorks,3."))
47 return 0;
48 chosen = finddevice("/chosen");
49 if (chosen == OF_INVALID_HANDLE) {
50 chosen = finddevice("/chosen@0");
51 if (chosen == OF_INVALID_HANDLE) {
52 printf("no chosen\n");
53 return 0;
54 }
55 }
56 if (getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
57 printf("no mmu\n");
58 return 0;
59 }
60 memory = (ihandle) call_prom("open", 1, 1, "/memory");
61 if (memory == OF_INVALID_HANDLE) {
62 memory = (ihandle) call_prom("open", 1, 1, "/memory@0");
63 if (memory == OF_INVALID_HANDLE) {
64 printf("no memory node\n");
65 return 0;
66 }
67 }
68 printf("old OF detected\n");
69 return 1;
70}
71
72void *claim(unsigned int virt, unsigned int size, unsigned int align)
15{ 73{
16 struct prom_args { 74 int ret;
17 char *service; 75 unsigned int result;
18 int nargs;
19 int nret;
20 unsigned int virt;
21 unsigned int size;
22 unsigned int align;
23 void *ret;
24 } args;
25 76
26 args.service = "claim"; 77 if (need_map < 0)
27 args.nargs = 3; 78 need_map = check_of_version();
28 args.nret = 1; 79 if (align || !need_map)
29 args.virt = virt; 80 return (void *) call_prom("claim", 3, 1, virt, size, align);
30 args.size = size; 81
31 args.align = align; 82 ret = call_prom_ret("call-method", 5, 2, &result, "claim", memory,
32 args.ret = (void *) 0; 83 align, size, virt);
33 (*of_prom_entry)(&args); 84 if (ret != 0 || result == -1)
34 return args.ret; 85 return (void *) -1;
86 ret = call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
87 align, size, virt);
88 /* 0x12 == coherent + read/write */
89 ret = call_prom("call-method", 6, 1, "map", chosen_mmu,
90 0x12, size, virt, virt);
91 return virt;
35} 92}
diff --git a/arch/ppc/boot/of1275/finddevice.c b/arch/ppc/boot/of1275/finddevice.c
index 2c0f7cbb793e..0dcb1201b772 100644
--- a/arch/ppc/boot/of1275/finddevice.c
+++ b/arch/ppc/boot/of1275/finddevice.c
@@ -10,22 +10,7 @@
10 10
11#include "of1275.h" 11#include "of1275.h"
12 12
13phandle 13phandle finddevice(const char *name)
14finddevice(const char *name)
15{ 14{
16 struct prom_args { 15 return (phandle) call_prom("finddevice", 1, 1, name);
17 char *service;
18 int nargs;
19 int nret;
20 const char *devspec;
21 phandle device;
22 } args;
23
24 args.service = "finddevice";
25 args.nargs = 1;
26 args.nret = 1;
27 args.devspec = name;
28 args.device = OF_INVALID_HANDLE;
29 (*of_prom_entry)(&args);
30 return args.device;
31} 16}