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-rw-r--r--arch/arm/mm/Kconfig15
-rw-r--r--arch/arm/mm/Makefile2
-rw-r--r--arch/arm/mm/cache-feroceon-l2.c318
-rw-r--r--arch/arm/mm/proc-feroceon.S20
4 files changed, 354 insertions, 1 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 08ca264459bd..3b90051c0e05 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -373,7 +373,7 @@ config CPU_FEROCEON
select CPU_CACHE_VIVT
select CPU_CP15_MMU
select CPU_COPY_FEROCEON if MMU
- select CPU_TLB_V4WBI if MMU
+ select CPU_TLB_FEROCEON if MMU
config CPU_FEROCEON_OLD_ID
bool "Accept early Feroceon cores with an ARM926 ID"
@@ -551,6 +551,11 @@ config CPU_TLB_V4WBI
ARM Architecture Version 4 TLB with writeback cache and invalidate
instruction cache entry.
+config CPU_TLB_FEROCEON
+ bool
+ help
+ Feroceon TLB (v4wbi with non-outer-cachable page table walks).
+
config CPU_TLB_V6
bool
@@ -709,6 +714,14 @@ config OUTER_CACHE
bool
default n
+config CACHE_FEROCEON_L2
+ bool "Enable the Feroceon L2 cache controller"
+ depends on FOOBAR
+ default y
+ select OUTER_CACHE
+ help
+ This option enables the Feroceon L2 cache controller.
+
config CACHE_L2X0
bool "Enable the L2x0 outer cache controller"
depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 32b2d2d213a6..f64b92557b11 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_CPU_TLB_V3) += tlb-v3.o
obj-$(CONFIG_CPU_TLB_V4WT) += tlb-v4.o
obj-$(CONFIG_CPU_TLB_V4WB) += tlb-v4wb.o
obj-$(CONFIG_CPU_TLB_V4WBI) += tlb-v4wbi.o
+obj-$(CONFIG_CPU_TLB_FEROCEON) += tlb-v4wbi.o # reuse v4wbi TLB functions
obj-$(CONFIG_CPU_TLB_V6) += tlb-v6.o
obj-$(CONFIG_CPU_TLB_V7) += tlb-v7.o
@@ -73,4 +74,5 @@ obj-$(CONFIG_CPU_FEROCEON) += proc-feroceon.o
obj-$(CONFIG_CPU_V6) += proc-v6.o
obj-$(CONFIG_CPU_V7) += proc-v7.o
+obj-$(CONFIG_CACHE_FEROCEON_L2) += cache-feroceon-l2.o
obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
diff --git a/arch/arm/mm/cache-feroceon-l2.c b/arch/arm/mm/cache-feroceon-l2.c
new file mode 100644
index 000000000000..20eec4ba173f
--- /dev/null
+++ b/arch/arm/mm/cache-feroceon-l2.c
@@ -0,0 +1,318 @@
+/*
+ * arch/arm/mm/cache-feroceon-l2.c - Feroceon L2 cache controller support
+ *
+ * Copyright (C) 2008 Marvell Semiconductor
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * References:
+ * - Unified Layer 2 Cache for Feroceon CPU Cores,
+ * Document ID MV-S104858-00, Rev. A, October 23 2007.
+ */
+
+#include <linux/init.h>
+#include <asm/cacheflush.h>
+#include <asm/plat-orion/cache-feroceon-l2.h>
+
+
+/*
+ * Low-level cache maintenance operations.
+ *
+ * As well as the regular 'clean/invalidate/flush L2 cache line by
+ * MVA' instructions, the Feroceon L2 cache controller also features
+ * 'clean/invalidate L2 range by MVA' operations.
+ *
+ * Cache range operations are initiated by writing the start and
+ * end addresses to successive cp15 registers, and process every
+ * cache line whose first byte address lies in the inclusive range
+ * [start:end].
+ *
+ * The cache range operations stall the CPU pipeline until completion.
+ *
+ * The range operations require two successive cp15 writes, in
+ * between which we don't want to be preempted.
+ */
+static inline void l2_clean_pa(unsigned long addr)
+{
+ __asm__("mcr p15, 1, %0, c15, c9, 3" : : "r" (addr));
+}
+
+static inline void l2_clean_mva_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ /*
+ * Make sure 'start' and 'end' reference the same page, as
+ * L2 is PIPT and range operations only do a TLB lookup on
+ * the start address.
+ */
+ BUG_ON((start ^ end) & ~(PAGE_SIZE - 1));
+
+ raw_local_irq_save(flags);
+ __asm__("mcr p15, 1, %0, c15, c9, 4" : : "r" (start));
+ __asm__("mcr p15, 1, %0, c15, c9, 5" : : "r" (end));
+ raw_local_irq_restore(flags);
+}
+
+static inline void l2_clean_pa_range(unsigned long start, unsigned long end)
+{
+ l2_clean_mva_range(__phys_to_virt(start), __phys_to_virt(end));
+}
+
+static inline void l2_clean_inv_pa(unsigned long addr)
+{
+ __asm__("mcr p15, 1, %0, c15, c10, 3" : : "r" (addr));
+}
+
+static inline void l2_inv_pa(unsigned long addr)
+{
+ __asm__("mcr p15, 1, %0, c15, c11, 3" : : "r" (addr));
+}
+
+static inline void l2_inv_mva_range(unsigned long start, unsigned long end)
+{
+ unsigned long flags;
+
+ /*
+ * Make sure 'start' and 'end' reference the same page, as
+ * L2 is PIPT and range operations only do a TLB lookup on
+ * the start address.
+ */
+ BUG_ON((start ^ end) & ~(PAGE_SIZE - 1));
+
+ raw_local_irq_save(flags);
+ __asm__("mcr p15, 1, %0, c15, c11, 4" : : "r" (start));
+ __asm__("mcr p15, 1, %0, c15, c11, 5" : : "r" (end));
+ raw_local_irq_restore(flags);
+}
+
+static inline void l2_inv_pa_range(unsigned long start, unsigned long end)
+{
+ l2_inv_mva_range(__phys_to_virt(start), __phys_to_virt(end));
+}
+
+
+/*
+ * Linux primitives.
+ *
+ * Note that the end addresses passed to Linux primitives are
+ * noninclusive, while the hardware cache range operations use
+ * inclusive start and end addresses.
+ */
+#define CACHE_LINE_SIZE 32
+#define MAX_RANGE_SIZE 1024
+
+static int l2_wt_override;
+
+static unsigned long calc_range_end(unsigned long start, unsigned long end)
+{
+ unsigned long range_end;
+
+ BUG_ON(start & (CACHE_LINE_SIZE - 1));
+ BUG_ON(end & (CACHE_LINE_SIZE - 1));
+
+ /*
+ * Try to process all cache lines between 'start' and 'end'.
+ */
+ range_end = end;
+
+ /*
+ * Limit the number of cache lines processed at once,
+ * since cache range operations stall the CPU pipeline
+ * until completion.
+ */
+ if (range_end > start + MAX_RANGE_SIZE)
+ range_end = start + MAX_RANGE_SIZE;
+
+ /*
+ * Cache range operations can't straddle a page boundary.
+ */
+ if (range_end > (start | (PAGE_SIZE - 1)) + 1)
+ range_end = (start | (PAGE_SIZE - 1)) + 1;
+
+ return range_end;
+}
+
+static void feroceon_l2_inv_range(unsigned long start, unsigned long end)
+{
+ /*
+ * Clean and invalidate partial first cache line.
+ */
+ if (start & (CACHE_LINE_SIZE - 1)) {
+ l2_clean_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
+ start = (start | (CACHE_LINE_SIZE - 1)) + 1;
+ }
+
+ /*
+ * Clean and invalidate partial last cache line.
+ */
+ if (end & (CACHE_LINE_SIZE - 1)) {
+ l2_clean_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
+ end &= ~(CACHE_LINE_SIZE - 1);
+ }
+
+ /*
+ * Invalidate all full cache lines between 'start' and 'end'.
+ */
+ while (start != end) {
+ unsigned long range_end = calc_range_end(start, end);
+ l2_inv_pa_range(start, range_end - CACHE_LINE_SIZE);
+ start = range_end;
+ }
+
+ dsb();
+}
+
+static void feroceon_l2_clean_range(unsigned long start, unsigned long end)
+{
+ /*
+ * If L2 is forced to WT, the L2 will always be clean and we
+ * don't need to do anything here.
+ */
+ if (!l2_wt_override) {
+ start &= ~(CACHE_LINE_SIZE - 1);
+ end = (end + CACHE_LINE_SIZE - 1) & ~(CACHE_LINE_SIZE - 1);
+ while (start != end) {
+ unsigned long range_end = calc_range_end(start, end);
+ l2_clean_pa_range(start, range_end - CACHE_LINE_SIZE);
+ start = range_end;
+ }
+ }
+
+ dsb();
+}
+
+static void feroceon_l2_flush_range(unsigned long start, unsigned long end)
+{
+ start &= ~(CACHE_LINE_SIZE - 1);
+ end = (end + CACHE_LINE_SIZE - 1) & ~(CACHE_LINE_SIZE - 1);
+ while (start != end) {
+ unsigned long range_end = calc_range_end(start, end);
+ if (!l2_wt_override)
+ l2_clean_pa_range(start, range_end - CACHE_LINE_SIZE);
+ l2_inv_pa_range(start, range_end - CACHE_LINE_SIZE);
+ start = range_end;
+ }
+
+ dsb();
+}
+
+
+/*
+ * Routines to disable and re-enable the D-cache and I-cache at run
+ * time. These are necessary because the L2 cache can only be enabled
+ * or disabled while the L1 Dcache and Icache are both disabled.
+ */
+static void __init invalidate_and_disable_dcache(void)
+{
+ u32 cr;
+
+ cr = get_cr();
+ if (cr & CR_C) {
+ unsigned long flags;
+
+ raw_local_irq_save(flags);
+ flush_cache_all();
+ set_cr(cr & ~CR_C);
+ raw_local_irq_restore(flags);
+ }
+}
+
+static void __init enable_dcache(void)
+{
+ u32 cr;
+
+ cr = get_cr();
+ if (!(cr & CR_C))
+ set_cr(cr | CR_C);
+}
+
+static void __init __invalidate_icache(void)
+{
+ int dummy;
+
+ __asm__ __volatile__("mcr p15, 0, %0, c7, c5, 0\n" : "=r" (dummy));
+}
+
+static void __init invalidate_and_disable_icache(void)
+{
+ u32 cr;
+
+ cr = get_cr();
+ if (cr & CR_I) {
+ set_cr(cr & ~CR_I);
+ __invalidate_icache();
+ }
+}
+
+static void __init enable_icache(void)
+{
+ u32 cr;
+
+ cr = get_cr();
+ if (!(cr & CR_I))
+ set_cr(cr | CR_I);
+}
+
+static inline u32 read_extra_features(void)
+{
+ u32 u;
+
+ __asm__("mrc p15, 1, %0, c15, c1, 0" : "=r" (u));
+
+ return u;
+}
+
+static inline void write_extra_features(u32 u)
+{
+ __asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
+}
+
+static void __init disable_l2_prefetch(void)
+{
+ u32 u;
+
+ /*
+ * Read the CPU Extra Features register and verify that the
+ * Disable L2 Prefetch bit is set.
+ */
+ u = read_extra_features();
+ if (!(u & 0x01000000)) {
+ printk(KERN_INFO "Feroceon L2: Disabling L2 prefetch.\n");
+ write_extra_features(u | 0x01000000);
+ }
+}
+
+static void __init enable_l2(void)
+{
+ u32 u;
+
+ u = read_extra_features();
+ if (!(u & 0x00400000)) {
+ printk(KERN_INFO "Feroceon L2: Enabling L2\n");
+
+ invalidate_and_disable_dcache();
+ invalidate_and_disable_icache();
+ write_extra_features(u | 0x00400000);
+ enable_icache();
+ enable_dcache();
+ }
+}
+
+void __init feroceon_l2_init(int __l2_wt_override)
+{
+ l2_wt_override = __l2_wt_override;
+
+ disable_l2_prefetch();
+
+ outer_cache.inv_range = feroceon_l2_inv_range;
+ outer_cache.clean_range = feroceon_l2_clean_range;
+ outer_cache.flush_range = feroceon_l2_flush_range;
+
+ enable_l2();
+
+ printk(KERN_INFO "Feroceon L2: Cache support initialised%s.\n",
+ l2_wt_override ? ", in WT override mode" : "");
+}
diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S
index c279652a98fd..cecf96ee07d5 100644
--- a/arch/arm/mm/proc-feroceon.S
+++ b/arch/arm/mm/proc-feroceon.S
@@ -79,6 +79,13 @@ ENTRY(cpu_feroceon_proc_fin)
mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
msr cpsr_c, ip
bl feroceon_flush_kern_cache_all
+
+#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH)
+ mov r0, #0
+ mcr p15, 1, r0, c15, c9, 0 @ clean L2
+ mcr p15, 0, r0, c7, c10, 4 @ drain WB
+#endif
+
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
bic r0, r0, #0x1000 @ ...i............
bic r0, r0, #0x000e @ ............wca.
@@ -382,10 +389,20 @@ ENTRY(feroceon_range_cache_fns)
.align 5
ENTRY(cpu_feroceon_dcache_clean_area)
+#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH)
+ mov r2, r0
+ mov r3, r1
+#endif
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
add r0, r0, #CACHE_DLINESIZE
subs r1, r1, #CACHE_DLINESIZE
bhi 1b
+#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH)
+1: mcr p15, 1, r2, c15, c9, 1 @ clean L2 entry
+ add r2, r2, #CACHE_DLINESIZE
+ subs r3, r3, #CACHE_DLINESIZE
+ bhi 1b
+#endif
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
@@ -449,6 +466,9 @@ ENTRY(cpu_feroceon_set_pte_ext)
str r2, [r0] @ hardware version
mov r0, r0
mcr p15, 0, r0, c7, c10, 1 @ clean D entry
+#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH)
+ mcr p15, 1, r0, c15, c9, 1 @ clean L2 entry
+#endif
mcr p15, 0, r0, c7, c10, 4 @ drain WB
#endif
mov pc, lr
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 17:30:02 +0100