[POWERPC] Add kernel parameter to set l3cr for MPC745x

Old-world powermacs don't set L2CR or L3CR on processor upgrade cards. This simple patch allows the setting of L3CR via a kernel parameter (like the existing kernel parameter to set L2CR). Signed-off-by: Robert Brose <bob@qbjnet.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
git-mirror · Apr 1, 2008 · a78bfbf · a78bfbf
1 parent b163a25
commit a78bfbf
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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
@@ -931,6 +931,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	l2cr=		[PPC]
 
+	l3cr=		[PPC]
+
 	lapic		[X86-32,APIC] Enable the local APIC even if BIOS
 			disabled it.
 

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
@@ -172,6 +172,18 @@ int __init ppc_setup_l2cr(char *str)
 }
 __setup("l2cr=", ppc_setup_l2cr);
 
+/* Checks "l3cr=xxxx" command-line option */
+int __init ppc_setup_l3cr(char *str)
+{
+	if (cpu_has_feature(CPU_FTR_L3CR)) {
+		unsigned long val = simple_strtoul(str, NULL, 0);
+		printk(KERN_INFO "l3cr set to %lx\n", val);
+		_set_L3CR(val);		/* and enable it */
+	}
+	return 1;
+}
+__setup("l3cr=", ppc_setup_l3cr);
+
 #ifdef CONFIG_GENERIC_NVRAM
 
 /* Generic nvram hooks used by drivers/char/gen_nvram.c */