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Date: Thu, 24 Jan 2008 16:03:34 +0100
From: monstr@...str.eu
To: monstr@...str.eu
Cc: linux-kernel@...r.kernel.org, stephen.neuendorffer@...inx.com,
john.williams@...alogix.com, microblaze-uclinux@...e.uq.edu.au
Subject: [PATCH 09/52] [microblaze] cache support
From: Michal Simek <monstr@...str.eu>
Signed-off-by: Michal Simek <monstr@...str.eu>
---
arch/microblaze/kernel/cpu/cache.c | 256 +++++++++++++++++++++++++++++++++++
include/asm-microblaze/cache.h | 47 +++++++
include/asm-microblaze/cacheflush.h | 72 ++++++++++
3 files changed, 375 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/kernel/cpu/cache.c
create mode 100644 include/asm-microblaze/cache.h
create mode 100644 include/asm-microblaze/cacheflush.h
diff --git a/arch/microblaze/kernel/cpu/cache.c b/arch/microblaze/kernel/cpu/cache.c
new file mode 100644
index 0000000..43fff59
--- /dev/null
+++ b/arch/microblaze/kernel/cpu/cache.c
@@ -0,0 +1,256 @@
+/*
+ * arch/microblaze/kernel/cpu/cache.c
+ * Cache control for MicroBlaze cache memories
+ *
+ * Copyright (C) 2007 Michal Simek <monstr@...str.eu>
+ * Copyright (C) 2007 PetaLogix
+ * Copyright (C) 2007 John Williams <john.williams@...alogix.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ */
+
+#include <asm/cacheflush.h>
+#include <asm/cache.h>
+#include <asm/cpuinfo.h>
+
+/* Exported functions */
+
+void _enable_icache(void)
+{
+ if (cpuinfo->use_icache) {
+#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
+ __asm__ __volatile__ (" \
+ msrset r0, %0; \
+ nop; " \
+ : \
+ : "i" (MSR_ICE) \
+ : "memory");
+#else
+ __asm__ __volatile__ (" \
+ mfs r12, rmsr; \
+ ori r12, r12, %0; \
+ mts rmsr, r12; \
+ nop; " \
+ : \
+ : "i" (MSR_ICE) \
+ : "memory", "r12");
+#endif
+ }
+}
+
+void _disable_icache(void)
+{
+ if (cpuinfo->use_icache) {
+#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
+ __asm__ __volatile__ (" \
+ msrclr r0, %0; \
+ nop; " \
+ : \
+ : "i" (MSR_ICE) \
+ : "memory");
+#else
+ __asm__ __volatile__ (" \
+ mfs r12, rmsr; \
+ andi r12, r12, ~%0; \
+ mts rmsr, r12; \
+ nop; " \
+ : \
+ : "i" (MSR_ICE) \
+ : "memory", "r12");
+#endif
+ }
+}
+
+void _invalidate_icache(unsigned int addr)
+{
+ if (cpuinfo->use_icache) {
+ __asm__ __volatile__ (" \
+ wic %0, r0" \
+ : \
+ : "r" (addr));
+ }
+}
+
+void _enable_dcache(void)
+{
+ if (cpuinfo->use_dcache) {
+#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
+ __asm__ __volatile__ (" \
+ msrset r0, %0; \
+ nop; " \
+ : \
+ : "i" (MSR_DCE) \
+ : "memory");
+#else
+ __asm__ __volatile__ (" \
+ mfs r12, rmsr; \
+ ori r12, r12, %0; \
+ mts rmsr, r12; \
+ nop; " \
+ : \
+ : "i" (MSR_DCE) \
+ : "memory", "r12");
+#endif
+ }
+}
+
+void _disable_dcache(void)
+{
+ if (cpuinfo->use_dcache) {
+#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
+ __asm__ __volatile__ (" \
+ msrclr r0, %0; \
+ nop; " \
+ : \
+ : "i" (MSR_DCE) \
+ : "memory");
+#else
+ __asm__ __volatile__ (" \
+ mfs r12, rmsr; \
+ andi r12, r12, ~%0; \
+ mts rmsr, r12; \
+ nop; " \
+ : \
+ : "i" (MSR_DCE) \
+ : "memory", "r12");
+#endif
+ }
+}
+
+void _invalidate_dcache(unsigned int addr)
+{
+ if (cpuinfo->use_dcache)
+ __asm__ __volatile__ (" \
+ wdc %0, r0" \
+ : \
+ : "r" (addr));
+}
+
+void __flush_icache_all(void)
+{
+ unsigned int i;
+ unsigned flags;
+
+ if (cpuinfo->use_icache) {
+ local_irq_save(flags);
+ __disable_icache();
+
+ /* Just loop through cache size and invalidate, no need to add
+ CACHE_BASE address */
+ for (i = 0; i < cpuinfo->icache_size;
+ i += cpuinfo->icache_line)
+ __invalidate_icache(i);
+
+ __enable_icache();
+ local_irq_restore(flags);
+ }
+}
+
+void __flush_icache_range(unsigned long start, unsigned long end)
+{
+ unsigned int i;
+ unsigned flags;
+ unsigned int align;
+
+ if (cpuinfo->use_icache) {
+ /*
+ * No need to cover entire cache range,
+ * just cover cache footprint
+ */
+ end = min(start + cpuinfo->icache_size, end);
+ align = ~(cpuinfo->icache_line - 1);
+ start &= align; /* Make sure we are aligned */
+ /* Push end up to the next cache line */
+ end = ((end & align) + cpuinfo->icache_line);
+
+ local_irq_save(flags);
+ __disable_icache();
+
+ for (i = start; i < end; i += cpuinfo->icache_line)
+ __invalidate_icache(i);
+
+ __enable_icache();
+ local_irq_restore(flags);
+ }
+}
+
+void __flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+ __flush_icache_all();
+}
+
+void __flush_icache_user_range(struct vm_area_struct *vma,
+ struct page *page, unsigned long adr,
+ int len)
+{
+ __flush_icache_all();
+}
+
+void __flush_cache_sigtramp(unsigned long addr)
+{
+ __flush_icache_range(addr, addr + 8);
+}
+
+void __flush_dcache_all(void)
+{
+ unsigned int i;
+ unsigned flags;
+
+ if (cpuinfo->use_dcache) {
+ local_irq_save(flags);
+ __disable_dcache();
+
+ /*
+ * Just loop through cache size and invalidate,
+ * no need to add CACHE_BASE address
+ */
+ for (i = 0; i < cpuinfo->dcache_size;
+ i += cpuinfo->dcache_line)
+ __invalidate_dcache(i);
+
+ __enable_dcache();
+ local_irq_restore(flags);
+ }
+}
+
+void __flush_dcache_range(unsigned long start, unsigned long end)
+{
+ unsigned int i;
+ unsigned flags;
+ unsigned int align;
+
+ if (cpuinfo->use_dcache) {
+ /*
+ * No need to cover entire cache range,
+ * just cover cache footprint
+ */
+ end = min(start + cpuinfo->dcache_size, end);
+ align = ~(cpuinfo->dcache_line - 1);
+ start &= align; /* Make sure we are aligned */
+ /* Push end up to the next cache line */
+ end = ((end & align) + cpuinfo->dcache_line);
+ local_irq_save(flags);
+ __disable_dcache();
+
+ for (i = start; i < end; i += cpuinfo->dcache_line)
+ __invalidate_dcache(i);
+
+ __enable_dcache();
+ local_irq_restore(flags);
+ }
+}
+
+void __flush_dcache_page(struct vm_area_struct *vma, struct page *page)
+{
+ __flush_dcache_all();
+}
+
+void __flush_dcache_user_range(struct vm_area_struct *vma,
+ struct page *page, unsigned long adr,
+ int len)
+{
+ __flush_dcache_all();
+}
diff --git a/include/asm-microblaze/cache.h b/include/asm-microblaze/cache.h
new file mode 100644
index 0000000..e988152
--- /dev/null
+++ b/include/asm-microblaze/cache.h
@@ -0,0 +1,47 @@
+/*
+ * include/asm-microblaze/cache.h
+ *
+ * Cache operations
+ *
+ * Copyright (C) 2007 Michal Simek <monstr@...str.eu>
+ * Copyright (C) 2003 John Williams <jwilliams@...e.uq.edu.au>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ */
+
+#ifndef _MICROBLAZE_CACHE_H
+#define _MICROBLAZE_CACHE_H
+
+#include <asm/registers.h>
+#include <linux/autoconf.h>
+
+#ifndef L1_CACHE_BYTES
+/* word-granular cache in microblaze */
+#define L1_CACHE_BYTES 4
+#endif
+
+void _enable_icache(void);
+void _disable_icache(void);
+void _invalidate_icache(unsigned int addr);
+
+#define __enable_icache() _enable_icache()
+#define __disable_icache() _disable_icache()
+#define __invalidate_icache(addr) _invalidate_icache(addr)
+
+void _enable_dcache(void);
+void _disable_dcache(void);
+void _invalidate_dcache(unsigned int addr);
+
+#define __enable_dcache() _enable_dcache()
+#define __disable_dcache() _disable_dcache()
+#define __invalidate_dcache(addr) _invalidate_dcache(addr)
+
+/* FIXME - I don't think this is right */
+#ifdef CONFIG_XILINX_UNCACHED_SHADOW
+#define UNCACHED_SHADOW_MASK (CONFIG_XILINX_ERAM_SIZE)
+#endif
+
+#endif /* _MICROBLAZE_CACHE_H */
diff --git a/include/asm-microblaze/cacheflush.h b/include/asm-microblaze/cacheflush.h
new file mode 100644
index 0000000..3051690
--- /dev/null
+++ b/include/asm-microblaze/cacheflush.h
@@ -0,0 +1,72 @@
+/*
+ * include/asm-microblaze/cacheflush.h
+ *
+ * Copyright (C) 2007 PetaLogix
+ * Copyright (C) 2007 John Williams <john.williams@...alogix.com>
+ * based on v850 version which was
+ * Copyright (C) 2001,02,03 NEC Electronics Corporation
+ * Copyright (C) 2001,02,03 Miles Bader <miles@....org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ */
+
+#ifndef _MICROBLAZE_CACHEFLUSH_H
+#define _MICROBLAZE_CACHEFLUSH_H
+
+/* Somebody depends on this; sigh... */
+#include <linux/mm.h>
+
+#define flush_cache_all() __flush_cache_all()
+#define flush_cache_mm(mm) do { } while (0)
+#define flush_cache_range(vma, start, end) __flush_cache_all()
+#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
+
+#define flush_dcache_range(start, end) __flush_dcache_range(start, end)
+#define flush_dcache_page(page) do { } while (0)
+#define flush_dcache_mmap_lock(mapping) do { } while (0)
+#define flush_dcache_mmap_unlock(mapping) do { } while (0)
+
+#define flush_icache_range(start, len) __flush_icache_range(start, len)
+#define flush_icache_page(vma, pg) do { } while (0)
+#define flush_icache_user_range(start, len) do { } while (0)
+
+#define flush_cache_vmap(start, end) do { } while (0)
+#define flush_cache_vunmap(start, end) do { } while (0)
+
+struct page;
+struct mm_struct;
+struct vm_area_struct;
+
+/* see arch/microblaze/kernel/cache.c */
+extern void __flush_icache_all(void);
+extern void __flush_icache_range(unsigned long start, unsigned long end);
+extern void __flush_icache_page(struct vm_area_struct *vma, struct page *page);
+extern void __flush_icache_user_range(struct vm_area_struct *vma,
+ struct page *page,
+ unsigned long adr, int len);
+extern void __flush_cache_sigtramp(unsigned long addr);
+
+extern void __flush_dcache_all(void);
+extern void __flush_dcache_range(unsigned long start, unsigned long end);
+extern void __flush_dcache_page(struct vm_area_struct *vma, struct page *page);
+extern void __flush_dcache_user_range(struct vm_area_struct *vma,
+ struct page *page,
+ unsigned long adr, int len);
+
+extern inline void __flush_cache_all(void)
+{
+ __flush_icache_all();
+ __flush_dcache_all();
+}
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+do { memcpy(dst, src, len); \
+ flush_icache_user_range(vma, page, vaddr, len); \
+} while (0)
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+ memcpy(dst, src, len)
+
+#endif /* _MICROBLAZE_CACHEFLUSH_H */
--
1.5.4.rc4.14.g6fc74
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