MIPS: TXx9: Cache fixup

TX39/TX49 can enable/disable I/D cache at runtime.  Add kernel options
to control them.  This is useful to debug some cache-related issues,
such as aliasing or I/D coherency.  Also enable CWF bit for TX49 SoCs.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/txx9/generic/setup_tx4927.c

@@ -44,6 +44,7 @@ void __init tx4927_setup(void)
 
 	txx9_reg_res_init(TX4927_REV_PCODE(), TX4927_REG_BASE,
 			  TX4927_REG_SIZE);
+	set_c0_config(TX49_CONF_CWFON);
 
 	/* SDRAMC,EBUSC are configured by PROM */
 	for (i = 0; i < 8; i++) {