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authorChris Dearman <chris@mips.com>2006-06-20 17:15:20 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-06-29 21:10:52 +0100
commit9318c51acd9689505850152cc98277a6d6f2d752 (patch)
tree7a8d49a377bed11ba2a45643c08af47f1222c51b /arch
parentf7a849153be3b66326b52dce0d07896b56cb4cd7 (diff)
[MIPS] MIPS32/MIPS64 secondary cache management
Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig8
-rw-r--r--arch/mips/kernel/cpu-probe.c2
-rw-r--r--arch/mips/mm/Makefile1
-rw-r--r--arch/mips/mm/c-r4k.c23
-rw-r--r--arch/mips/mm/sc-mips.c141
5 files changed, 168 insertions, 7 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 05663e5ddd3..bc6a8f97721 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -325,6 +325,7 @@ config MIPS_MALTA
select I8259
select MIPS_BOARDS_GEN
select MIPS_BONITO64
+ select MIPS_CPU_SCACHE
select MIPS_GT64120
select MIPS_MSC
select SWAP_IO_SPACE
@@ -1478,6 +1479,13 @@ config IP22_CPU_SCACHE
bool
select BOARD_SCACHE
+#
+# Support for a MIPS32 / MIPS64 style S-caches
+#
+config MIPS_CPU_SCACHE
+ bool
+ select BOARD_SCACHE
+
config R5000_CPU_SCACHE
bool
select BOARD_SCACHE
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 8c2c359a05f..e045aba4ebd 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -597,8 +597,6 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c)
break;
case PRID_IMP_25KF:
c->cputype = CPU_25KF;
- /* Probe for L2 cache */
- c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
break;
case PRID_IMP_34K:
c->cputype = CPU_34K;
diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile
index 4a6220116c9..19e41fd186c 100644
--- a/arch/mips/mm/Makefile
+++ b/arch/mips/mm/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_CPU_VR41XX) += c-r4k.o cex-gen.o pg-r4k.o tlb-r4k.o
obj-$(CONFIG_IP22_CPU_SCACHE) += sc-ip22.o
obj-$(CONFIG_R5000_CPU_SCACHE) += sc-r5k.o
obj-$(CONFIG_RM7000_CPU_SCACHE) += sc-rm7k.o
+obj-$(CONFIG_MIPS_CPU_SCACHE) += sc-mips.o
#
# Choose one DMA coherency model
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 4a43924cd4f..01450938db8 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -1092,6 +1092,7 @@ static int __init probe_scache(void)
extern int r5k_sc_init(void);
extern int rm7k_sc_init(void);
+extern int mips_sc_init(void);
static void __init setup_scache(void)
{
@@ -1139,17 +1140,29 @@ static void __init setup_scache(void)
return;
default:
+ if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
+ c->isa_level == MIPS_CPU_ISA_M32R2 ||
+ c->isa_level == MIPS_CPU_ISA_M64R1 ||
+ c->isa_level == MIPS_CPU_ISA_M64R2) {
+#ifdef CONFIG_MIPS_CPU_SCACHE
+ if (mips_sc_init ()) {
+ scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
+ printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
+ scache_size >> 10,
+ way_string[c->scache.ways], c->scache.linesz);
+ }
+#else
+ if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
+ panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
+#endif
+ return;
+ }
sc_present = 0;
}
if (!sc_present)
return;
- if ((c->isa_level == MIPS_CPU_ISA_M32R1 ||
- c->isa_level == MIPS_CPU_ISA_M64R1) &&
- !(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
- panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
-
/* compute a couple of other cache variables */
c->scache.waysize = scache_size / c->scache.ways;
diff --git a/arch/mips/mm/sc-mips.c b/arch/mips/mm/sc-mips.c
new file mode 100644
index 00000000000..d3f92a9e831
--- /dev/null
+++ b/arch/mips/mm/sc-mips.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2006 Chris Dearman (chris@mips.com),
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include <asm/mipsregs.h>
+#include <asm/bcache.h>
+#include <asm/cacheops.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/mmu_context.h>
+#include <asm/r4kcache.h>
+
+/*
+ * MIPS32/MIPS64 L2 cache handling
+ */
+
+/*
+ * Writeback and invalidate the secondary cache before DMA.
+ */
+static void mips_sc_wback_inv(unsigned long addr, unsigned long size)
+{
+ unsigned long sc_lsize = cpu_scache_line_size();
+ unsigned long end, a;
+
+ pr_debug("mips_sc_wback_inv[%08lx,%08lx]", addr, size);
+
+ /* Catch bad driver code */
+ BUG_ON(size == 0);
+
+ a = addr & ~(sc_lsize - 1);
+ end = (addr + size - 1) & ~(sc_lsize - 1);
+ while (1) {
+ flush_scache_line(a); /* Hit_Writeback_Inv_SD */
+ if (a == end)
+ break;
+ a += sc_lsize;
+ }
+}
+
+/*
+ * Invalidate the secondary cache before DMA.
+ */
+static void mips_sc_inv(unsigned long addr, unsigned long size)
+{
+ unsigned long sc_lsize = cpu_scache_line_size();
+ unsigned long end, a;
+
+ pr_debug("mips_sc_inv[%08lx,%08lx]", addr, size);
+
+ /* Catch bad driver code */
+ BUG_ON(size == 0);
+
+ a = addr & ~(sc_lsize - 1);
+ end = (addr + size - 1) & ~(sc_lsize - 1);
+ while (1) {
+ invalidate_scache_line(a); /* Hit_Invalidate_SD */
+ if (a == end)
+ break;
+ a += sc_lsize;
+ }
+}
+
+static void mips_sc_enable(void)
+{
+ /* L2 cache is permanently enabled */
+}
+
+static void mips_sc_disable(void)
+{
+ /* L2 cache is permanently enabled */
+}
+
+static struct bcache_ops mips_sc_ops = {
+ .bc_enable = mips_sc_enable,
+ .bc_disable = mips_sc_disable,
+ .bc_wback_inv = mips_sc_wback_inv,
+ .bc_inv = mips_sc_inv
+};
+
+static inline int __init mips_sc_probe(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+ unsigned int config1, config2;
+ unsigned int tmp;
+
+ /* Mark as not present until probe completed */
+ c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
+
+ /* Ignore anything but MIPSxx processors */
+ if (c->isa_level != MIPS_CPU_ISA_M32R1 &&
+ c->isa_level != MIPS_CPU_ISA_M32R2 &&
+ c->isa_level != MIPS_CPU_ISA_M64R1 &&
+ c->isa_level != MIPS_CPU_ISA_M64R2)
+ return 0;
+
+ /* Does this MIPS32/MIPS64 CPU have a config2 register? */
+ config1 = read_c0_config1();
+ if (!(config1 & MIPS_CONF_M))
+ return 0;
+
+ config2 = read_c0_config2();
+ tmp = (config2 >> 4) & 0x0f;
+ if (0 < tmp && tmp <= 7)
+ c->scache.linesz = 2 << tmp;
+ else
+ return 0;
+
+ tmp = (config2 >> 8) & 0x0f;
+ if (0 <= tmp && tmp <= 7)
+ c->scache.sets = 64 << tmp;
+ else
+ return 0;
+
+ tmp = (config2 >> 0) & 0x0f;
+ if (0 <= tmp && tmp <= 7)
+ c->scache.ways = tmp + 1;
+ else
+ return 0;
+
+ c->scache.waysize = c->scache.sets * c->scache.linesz;
+
+ c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
+
+ return 1;
+}
+
+int __init mips_sc_init(void)
+{
+ int found = mips_sc_probe ();
+ if (found) {
+ mips_sc_enable();
+ bcops = &mips_sc_ops;
+ }
+ return found;
+}
+