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>

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index dc5dbcc53a91..fa88aefea9ef 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -25,6 +25,7 @@
 #include <asm/bootinfo.h>
 #include <asm/time.h>
 #include <asm/reboot.h>
+#include <asm/r4kcache.h>
 #include <asm/txx9/generic.h>
 #include <asm/txx9/pci.h>
 #ifdef CONFIG_CPU_TX49XX
@@ -186,6 +187,110 @@ static void __init prom_init_cmdline(void)
         }
 }
 
+static int txx9_ic_disable __initdata;
+static int txx9_dc_disable __initdata;
+
+#if defined(CONFIG_CPU_TX49XX)
+/* flush all cache on very early stage (before 4k_cache_init) */
+static void __init early_flush_dcache(void)
+{
+        unsigned int conf = read_c0_config();
+        unsigned int dc_size = 1 << (12 + ((conf & CONF_DC) >> 6));
+        unsigned int linesz = 32;
+        unsigned long addr, end;
+
+        end = INDEX_BASE + dc_size / 4;
+        /* 4way, waybit=0 */
+        for (addr = INDEX_BASE; addr < end; addr += linesz) {
+                cache_op(Index_Writeback_Inv_D, addr | 0);
+                cache_op(Index_Writeback_Inv_D, addr | 1);
+                cache_op(Index_Writeback_Inv_D, addr | 2);
+                cache_op(Index_Writeback_Inv_D, addr | 3);
+        }
+}
+
+static void __init txx9_cache_fixup(void)
+{
+        unsigned int conf;
+
+        conf = read_c0_config();
+        /* flush and disable */
+        if (txx9_ic_disable) {
+                conf |= TX49_CONF_IC;
+                write_c0_config(conf);
+        }
+        if (txx9_dc_disable) {
+                early_flush_dcache();
+                conf |= TX49_CONF_DC;
+                write_c0_config(conf);
+        }
+
+        /* enable cache */
+        conf = read_c0_config();
+        if (!txx9_ic_disable)
+                conf &= ~TX49_CONF_IC;
+        if (!txx9_dc_disable)
+                conf &= ~TX49_CONF_DC;
+        write_c0_config(conf);
+
+        if (conf & TX49_CONF_IC)
+                pr_info("TX49XX I-Cache disabled.\n");
+        if (conf & TX49_CONF_DC)
+                pr_info("TX49XX D-Cache disabled.\n");
+}
+#elif defined(CONFIG_CPU_TX39XX)
+/* flush all cache on very early stage (before tx39_cache_init) */
+static void __init early_flush_dcache(void)
+{
+        unsigned int conf = read_c0_config();
+        unsigned int dc_size = 1 << (10 + ((conf & TX39_CONF_DCS_MASK) >>
+                                           TX39_CONF_DCS_SHIFT));
+        unsigned int linesz = 16;
+        unsigned long addr, end;
+
+        end = INDEX_BASE + dc_size / 2;
+        /* 2way, waybit=0 */
+        for (addr = INDEX_BASE; addr < end; addr += linesz) {
+                cache_op(Index_Writeback_Inv_D, addr | 0);
+                cache_op(Index_Writeback_Inv_D, addr | 1);
+        }
+}
+
+static void __init txx9_cache_fixup(void)
+{
+        unsigned int conf;
+
+        conf = read_c0_config();
+        /* flush and disable */
+        if (txx9_ic_disable) {
+                conf &= ~TX39_CONF_ICE;
+                write_c0_config(conf);
+        }
+        if (txx9_dc_disable) {
+                early_flush_dcache();
+                conf &= ~TX39_CONF_DCE;
+                write_c0_config(conf);
+        }
+
+        /* enable cache */
+        conf = read_c0_config();
+        if (!txx9_ic_disable)
+                conf |= TX39_CONF_ICE;
+        if (!txx9_dc_disable)
+                conf |= TX39_CONF_DCE;
+        write_c0_config(conf);
+
+        if (!(conf & TX39_CONF_ICE))
+                pr_info("TX39XX I-Cache disabled.\n");
+        if (!(conf & TX39_CONF_DCE))
+                pr_info("TX39XX D-Cache disabled.\n");
+}
+#else
+static inline void txx9_cache_fixup(void)
+{
+}
+#endif
+
 static void __init preprocess_cmdline(void)
 {
         char cmdline[CL_SIZE];
@@ -204,11 +309,19 @@ static void __init preprocess_cmdline(void)
                         if (strict_strtoul(str + 10, 10, &val) == 0)
                                 txx9_master_clock = val;
                         continue;
+                } else if (strcmp(str, "icdisable") == 0) {
+                        txx9_ic_disable = 1;
+                        continue;
+                } else if (strcmp(str, "dcdisable") == 0) {
+                        txx9_dc_disable = 1;
+                        continue;
                 }
                 if (arcs_cmdline[0])
                         strcat(arcs_cmdline, " ");
                 strcat(arcs_cmdline, str);
         }
+
+        txx9_cache_fixup();
 }
 
 static void __init select_board(void)