[PATCH] powerpc: Kill _machine and hard-coded platform numbers
This removes statically assigned platform numbers and reworks the
powerpc platform probe code to use a better mechanism. With this,
board support files can simply declare a new machine type with a
macro, and implement a probe() function that uses the flattened
device-tree to detect if they apply for a given machine.
We now have a machine_is() macro that replaces the comparisons of
_machine with the various PLATFORM_* constants. This commit also
changes various drivers to use the new macro instead of looking at
_machine.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index b17630a..3473cb9 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -9,6 +9,9 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
+
+#undef DEBUG
+
#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
@@ -41,6 +44,7 @@
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
+#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
@@ -56,8 +60,6 @@
#include "setup.h"
-#undef DEBUG
-
#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
@@ -65,10 +67,12 @@
#define DBG(fmt...)
#endif
-#ifdef CONFIG_PPC_MULTIPLATFORM
-int _machine = 0;
-EXPORT_SYMBOL(_machine);
-#endif
+/* The main machine-dep calls structure
+ */
+struct machdep_calls ppc_md;
+EXPORT_SYMBOL(ppc_md);
+struct machdep_calls *machine_id;
+EXPORT_SYMBOL(machine_id);
unsigned long klimit = (unsigned long) _end;
@@ -168,7 +172,8 @@
bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP && CONFIG_PPC32 */
seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
-
+ if (ppc_md.name)
+ seq_printf(m, "platform\t: %s\n", ppc_md.name);
if (ppc_md.show_cpuinfo != NULL)
ppc_md.show_cpuinfo(m);
@@ -387,7 +392,7 @@
* On pSeries LPAR, we need to know how many cpus
* could possibly be added to this partition.
*/
- if (_machine == PLATFORM_PSERIES_LPAR &&
+ if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
(dn = of_find_node_by_path("/rtas"))) {
int num_addr_cell, num_size_cell, maxcpus;
unsigned int *ireg;
@@ -456,3 +461,34 @@
}
early_param("xmon", early_xmon);
#endif
+
+void probe_machine(void)
+{
+ extern struct machdep_calls __machine_desc_start;
+ extern struct machdep_calls __machine_desc_end;
+
+ /*
+ * Iterate all ppc_md structures until we find the proper
+ * one for the current machine type
+ */
+ DBG("Probing machine type ...\n");
+
+ for (machine_id = &__machine_desc_start;
+ machine_id < &__machine_desc_end;
+ machine_id++) {
+ DBG(" %s ...", machine_id->name);
+ memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
+ if (ppc_md.probe()) {
+ DBG(" match !\n");
+ break;
+ }
+ DBG("\n");
+ }
+ /* What can we do if we didn't find ? */
+ if (machine_id >= &__machine_desc_end) {
+ DBG("No suitable machine found !\n");
+ for (;;);
+ }
+
+ printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
+}