MIPS: ralink: mt7620: Add cpu-feature-override header

Override certain CPU features to help GCC to optimize
the generated code. Saves about 150KB in the vmlinux
image with a generic configuration.

     text    data     bss     dec     hex filename
  3824158  134820  234192 4193170  3ffb92 vmlinux.no-override
  3664054  138804  234192 4037050  3d99ba vmlinux.override

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5759/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/mach-ralink/mt7620/cpu-feature-overrides.h b/arch/mips/include/asm/mach-ralink/mt7620/cpu-feature-overrides.h
new file mode 100644 (file)
index 0000000..f7bb8cf
--- /dev/null
+++ b/arch/mips/include/asm/mach-ralink/mt7620/cpu-feature-overrides.h
@@ -0,0 +1,57 @@
+/*
+ * Ralink MT7620 specific CPU feature overrides
+ *
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * This file was derived from: include/asm-mips/cpu-features.h
+ *     Copyright (C) 2003, 2004 Ralf Baechle
+ *     Copyright (C) 2004 Maciej W. Rozycki
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+#ifndef _MT7620_CPU_FEATURE_OVERRIDES_H
+#define _MT7620_CPU_FEATURE_OVERRIDES_H
+
+#define cpu_has_tlb            1
+#define cpu_has_4kex           1
+#define cpu_has_3k_cache       0
+#define cpu_has_4k_cache       1
+#define cpu_has_tx39_cache     0
+#define cpu_has_sb1_cache      0
+#define cpu_has_fpu            0
+#define cpu_has_32fpr          0
+#define cpu_has_counter                1
+#define cpu_has_watch          1
+#define cpu_has_divec          1
+
+#define cpu_has_prefetch       1
+#define cpu_has_ejtag          1
+#define cpu_has_llsc           1
+
+#define cpu_has_mips16         1
+#define cpu_has_mdmx           0
+#define cpu_has_mips3d         0
+#define cpu_has_smartmips      0
+
+#define cpu_has_mips32r1       1
+#define cpu_has_mips32r2       1
+#define cpu_has_mips64r1       0
+#define cpu_has_mips64r2       0
+
+#define cpu_has_dsp            1
+#define cpu_has_dsp2           0
+#define cpu_has_mipsmt         0
+
+#define cpu_has_64bits         0
+#define cpu_has_64bit_zero_reg 0
+#define cpu_has_64bit_gp_regs  0
+#define cpu_has_64bit_addresses        0
+
+#define cpu_dcache_line_size() 32
+#define cpu_icache_line_size() 32
+
+#endif /* _MT7620_CPU_FEATURE_OVERRIDES_H */

diff --git a/arch/mips/ralink/Platform b/arch/mips/ralink/Platform
index cda4b6645c50587da40f9ad9ffa0357d27fe74ab..6d9c8c499f988d4949f72c6484f8e948dff6fec2 100644 (file)
--- a/arch/mips/ralink/Platform
+++ b/arch/mips/ralink/Platform
@@ -26,3 +26,4 @@ cflags-$(CONFIG_SOC_RT3883)   += -I$(srctree)/arch/mips/include/asm/mach-ralink/rt
 # Ralink MT7620
 #
 load-$(CONFIG_SOC_MT7620)      += 0xffffffff80000000
+cflags-$(CONFIG_SOC_MT7620)    += -I$(srctree)/arch/mips/include/asm/mach-ralink/mt7620