powerpc: Run on old powermacs.
Old powermacs have a number of differences from current machines:
- there is no interrupt tree in the device tree, just interrupt
or AAPL,interrupt properties
- the chosen node in the device tree is called /chosen@0
- the OF claim method doesn't map the memory, so we have to do
an explicit map call as well
- there is no /chosen/cpu property on SMP machines
- the NVRAM isn't structured as a set of partitions.
This adapts the merged powermac support code to cope with these
issues.
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 095659d..18d266d 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -132,6 +132,7 @@
ihandle chosen;
int cpu;
ihandle stdout;
+ ihandle mmumap;
};
struct mem_map_entry {
@@ -274,14 +275,6 @@
}
-static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
- unsigned long align)
-{
- return (unsigned int)call_prom("claim", 3, 1,
- (prom_arg_t)virt, (prom_arg_t)size,
- (prom_arg_t)align);
-}
-
static void __init prom_print(const char *msg)
{
const char *p, *q;
@@ -363,6 +356,21 @@
}
+static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
+ unsigned long align)
+{
+ int ret;
+ struct prom_t *_prom = &RELOC(prom);
+
+ ret = call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
+ (prom_arg_t)align);
+ if (ret != -1 && _prom->mmumap != 0)
+ /* old pmacs need us to map as well */
+ call_prom("call-method", 6, 1,
+ ADDR("map"), _prom->mmumap, 0, size, virt, virt);
+ return ret;
+}
+
static void __init __attribute__((noreturn)) prom_panic(const char *reason)
{
#ifdef CONFIG_PPC64
@@ -1323,8 +1331,38 @@
_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
if (!PHANDLE_VALID(_prom->root))
prom_panic("cannot find device tree root"); /* msg won't be printed :( */
+
+ _prom->mmumap = 0;
}
+#ifdef CONFIG_PPC32
+/*
+ * For really old powermacs, we need to map things we claim.
+ * For that, we need the ihandle of the mmu.
+ */
+static void __init prom_find_mmu(void)
+{
+ struct prom_t *_prom = &RELOC(prom);
+ phandle oprom;
+ char version[64];
+
+ oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
+ if (!PHANDLE_VALID(oprom))
+ return;
+ if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
+ return;
+ version[sizeof(version) - 1] = 0;
+ prom_printf("OF version is '%s'\n", version);
+ /* XXX might need to add other versions here */
+ if (strcmp(version, "Open Firmware, 1.0.5") != 0)
+ return;
+ prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
+ sizeof(_prom->mmumap));
+}
+#else
+#define prom_find_mmu()
+#endif
+
static void __init prom_init_stdout(void)
{
struct prom_t *_prom = &RELOC(prom);
@@ -1379,7 +1417,7 @@
if (sl == 0)
break;
if (strstr(p, RELOC("Power Macintosh")) ||
- strstr(p, RELOC("MacRISC4")))
+ strstr(p, RELOC("MacRISC")))
return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
if (strstr(p, RELOC("Momentum,Maple")))
@@ -1618,22 +1656,17 @@
namep[l] = '\0';
/* Fixup an Apple bug where they have bogus \0 chars in the
- * middle of the path in some properties
+ * middle of the path in some properties, and extract
+ * the unit name (everything after the last '/').
*/
- for (p = namep, ep = namep + l; p < ep; p++)
- if (*p == '\0') {
- memmove(p, p+1, ep - p);
- ep--; l--; p--;
- }
-
- /* now try to extract the unit name in that mess */
- for (p = namep, lp = NULL; *p; p++)
+ for (lp = p = namep, ep = namep + l; p < ep; p++) {
if (*p == '/')
- lp = p + 1;
- if (lp != NULL)
- memmove(namep, lp, strlen(lp) + 1);
- *mem_start = _ALIGN(((unsigned long) namep) +
- strlen(namep) + 1, 4);
+ lp = namep;
+ else if (*p != 0)
+ *lp++ = *p;
+ }
+ *lp = 0;
+ *mem_start = _ALIGN((unsigned long)lp + 1, 4);
}
/* get it again for debugging */
@@ -1858,8 +1891,9 @@
ihandle prom_cpu;
phandle cpu_pkg;
+ _prom->cpu = 0;
if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
- prom_panic("cannot find boot cpu");
+ return;
cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
@@ -1934,6 +1968,11 @@
prom_init_stdout();
/*
+ * See if this OF is old enough that we need to do explicit maps
+ */
+ prom_find_mmu();
+
+ /*
* Check for an initrd
*/
prom_check_initrd(r3, r4);