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Message-ID: <00d401cba465$05356a70$0fa03f50$@mprc.pku.edu.cn>
Date: Sun, 26 Dec 2010 02:53:29 +0800
From: "Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To: <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc: 雪涛 管 <guanxuetao@...c.pku.edu.cn>
Subject: [PATCHv1 08/12] unicore32 core architecture: mm related: consistent device DMA handling
From: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
Patch 8 implements consistent device DMA handling of memory management.
DMA device operations are also here.
Signed-off-by: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
---
arch/unicore32/include/asm/cacheflush.h | 211 +++++++++++++++++++++++++++++
arch/unicore32/include/asm/dma-mapping.h | 124 +++++++++++++++++
arch/unicore32/include/asm/dma.h | 23 ++++
arch/unicore32/include/asm/mach/dma.h | 41 ++++++
arch/unicore32/include/asm/tlbflush.h | 192 +++++++++++++++++++++++++++
arch/unicore32/mm/cache-ucv2.S | 212 ++++++++++++++++++++++++++++++
arch/unicore32/mm/dma-swiotlb.c | 33 +++++
arch/unicore32/mm/flush.c | 98 ++++++++++++++
arch/unicore32/mm/tlb-ucv2.S | 89 +++++++++++++
drivers/staging/puv3/puv3_dma.c | 187 ++++++++++++++++++++++++++
10 files changed, 1210 insertions(+), 0 deletions(-)
diff --git a/arch/unicore32/include/asm/cacheflush.h b/arch/unicore32/include/asm/cacheflush.h
new file mode 100644
index 0000000..c0301e6
--- /dev/null
+++ b/arch/unicore32/include/asm/cacheflush.h
@@ -0,0 +1,211 @@
+/*
+ * linux/arch/unicore32/include/asm/cacheflush.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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 __UNICORE_CACHEFLUSH_H__
+#define __UNICORE_CACHEFLUSH_H__
+
+#include <linux/mm.h>
+
+#include <asm/shmparam.h>
+
+#define CACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
+
+/*
+ * This flag is used to indicate that the page pointed to by a pte is clean
+ * and does not require cleaning before returning it to the user.
+ */
+#define PG_dcache_clean PG_arch_1
+
+/*
+ * MM Cache Management
+ * ===================
+ *
+ * The arch/unicore32/mm/cache.S files implement these methods.
+ *
+ * Start addresses are inclusive and end addresses are exclusive;
+ * start addresses should be rounded down, end addresses up.
+ *
+ * See Documentation/cachetlb.txt for more information.
+ * Please note that the implementation of these, and the required
+ * effects are cache-type (VIVT/VIPT/PIPT) specific.
+ *
+ * flush_icache_all()
+ *
+ * Unconditionally clean and invalidate the entire icache.
+ * Currently only needed for cache-v6.S and cache-v7.S, see
+ * __flush_icache_all for the generic implementation.
+ *
+ * flush_kern_all()
+ *
+ * Unconditionally clean and invalidate the entire cache.
+ *
+ * flush_user_all()
+ *
+ * Clean and invalidate all user space cache entries
+ * before a change of page tables.
+ *
+ * flush_user_range(start, end, flags)
+ *
+ * Clean and invalidate a range of cache entries in the
+ * specified address space before a change of page tables.
+ * - start - user start address (inclusive, page aligned)
+ * - end - user end address (exclusive, page aligned)
+ * - flags - vma->vm_flags field
+ *
+ * coherent_kern_range(start, end)
+ *
+ * Ensure coherency between the Icache and the Dcache in the
+ * region described by start, end. If you have non-snooping
+ * Harvard caches, you need to implement this function.
+ * - start - virtual start address
+ * - end - virtual end address
+ *
+ * coherent_user_range(start, end)
+ *
+ * Ensure coherency between the Icache and the Dcache in the
+ * region described by start, end. If you have non-snooping
+ * Harvard caches, you need to implement this function.
+ * - start - virtual start address
+ * - end - virtual end address
+ *
+ * flush_kern_dcache_area(kaddr, size)
+ *
+ * Ensure that the data held in page is written back.
+ * - kaddr - page address
+ * - size - region size
+ *
+ * DMA Cache Coherency
+ * ===================
+ *
+ * dma_flush_range(start, end)
+ *
+ * Clean and invalidate the specified virtual address range.
+ * - start - virtual start address
+ * - end - virtual end address
+ */
+
+extern void __cpuc_flush_icache_all(void);
+extern void __cpuc_flush_kern_all(void);
+extern void __cpuc_flush_user_all(void);
+extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int);
+extern void __cpuc_coherent_kern_range(unsigned long, unsigned long);
+extern void __cpuc_coherent_user_range(unsigned long, unsigned long);
+extern void __cpuc_flush_dcache_area(void *, size_t);
+extern void __cpuc_flush_kern_dcache_area(void *addr, size_t size);
+
+/*
+ * These are private to the dma-mapping API. Do not use directly.
+ * Their sole purpose is to ensure that data held in the cache
+ * is visible to DMA, or data written by DMA to system memory is
+ * visible to the CPU.
+ */
+extern void __cpuc_dma_clean_range(unsigned long, unsigned long);
+extern void __cpuc_dma_flush_range(unsigned long, unsigned long);
+
+/*
+ * Copy user data from/to a page which is mapped into a different
+ * processes address space. Really, we want to allow our "user
+ * space" model to handle this.
+ */
+extern void copy_to_user_page(struct vm_area_struct *, struct page *,
+ unsigned long, void *, const void *, unsigned long);
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+ do { \
+ memcpy(dst, src, len); \
+ } while (0)
+
+/*
+ * Convert calls to our calling convention.
+ */
+/* Invalidate I-cache */
+static inline void __flush_icache_all(void)
+{
+ asm("movc p0.c5, %0, #20;\n"
+ "nop; nop; nop; nop; nop; nop; nop; nop\n"
+ :
+ : "r" (0));
+}
+
+#define flush_cache_all() __cpuc_flush_kern_all()
+
+extern void flush_cache_mm(struct mm_struct *mm);
+extern void flush_cache_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+extern void flush_cache_page(struct vm_area_struct *vma,
+ unsigned long user_addr, unsigned long pfn);
+
+#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
+
+/*
+ * flush_cache_user_range is used when we want to ensure that the
+ * Harvard caches are synchronised for the user space address range.
+ * This is used for the UniCore private sys_cacheflush system call.
+ */
+#define flush_cache_user_range(vma, start, end) \
+ __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
+
+/*
+ * Perform necessary cache operations to ensure that data previously
+ * stored within this range of addresses can be executed by the CPU.
+ */
+#define flush_icache_range(s, e) __cpuc_coherent_kern_range(s, e)
+
+/*
+ * Perform necessary cache operations to ensure that the TLB will
+ * see data written in the specified area.
+ */
+#define clean_dcache_area(start, size) cpu_dcache_clean_area(start, size)
+
+/*
+ * flush_dcache_page is used when the kernel has written to the page
+ * cache page at virtual address page->virtual.
+ *
+ * If this page isn't mapped (ie, page_mapping == NULL), or it might
+ * have userspace mappings, then we _must_ always clean + invalidate
+ * the dcache entries associated with the kernel mapping.
+ *
+ * Otherwise we can defer the operation, and clean the cache when we are
+ * about to change to user space. This is the same method as used on SPARC64.
+ * See update_mmu_cache for the user space part.
+ */
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+extern void flush_dcache_page(struct page *);
+
+#define flush_dcache_mmap_lock(mapping) \
+ spin_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) \
+ spin_unlock_irq(&(mapping)->tree_lock)
+
+#define flush_icache_user_range(vma, page, addr, len) \
+ flush_dcache_page(page)
+
+/*
+ * We don't appear to need to do anything here. In fact, if we did, we'd
+ * duplicate cache flushing elsewhere performed by flush_dcache_page().
+ */
+#define flush_icache_page(vma, page) do { } while (0)
+
+/*
+ * flush_cache_vmap() is used when creating mappings (eg, via vmap,
+ * vmalloc, ioremap etc) in kernel space for pages. On non-VIPT
+ * caches, since the direct-mappings of these pages may contain cached
+ * data, we need to do a full cache flush to ensure that writebacks
+ * don't corrupt data placed into these pages via the new mappings.
+ */
+static inline void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+}
+
+static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
+{
+}
+
+#endif
diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
new file mode 100644
index 0000000..9258e59
--- /dev/null
+++ b/arch/unicore32/include/asm/dma-mapping.h
@@ -0,0 +1,124 @@
+/*
+ * linux/arch/unicore32/include/asm/dma-mapping.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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 __UNICORE_DMA_MAPPING_H__
+#define __UNICORE_DMA_MAPPING_H__
+
+#ifdef __KERNEL__
+
+#include <linux/mm_types.h>
+#include <linux/scatterlist.h>
+#include <linux/swiotlb.h>
+
+#include <asm-generic/dma-coherent.h>
+
+#include <asm/memory.h>
+#include <asm/cacheflush.h>
+
+extern struct dma_map_ops swiotlb_dma_map_ops;
+
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+ return &swiotlb_dma_map_ops;
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ if (unlikely(dma_ops == NULL))
+ return 0;
+
+ return dma_ops->dma_supported(dev, mask);
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ if (dma_ops->mapping_error)
+ return dma_ops->mapping_error(dev, dma_addr);
+
+ return 0;
+}
+
+#include <asm-generic/dma-mapping-common.h>
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+ if (dev && dev->dma_mask)
+ return addr + size - 1 <= *dev->dma_mask;
+
+ return 1;
+}
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ return paddr;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+ return daddr;
+}
+
+static inline void dma_mark_clean(void *addr, size_t size) {}
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+ if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+ return -EIO;
+
+ *dev->dma_mask = dma_mask;
+
+ return 0;
+}
+
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flag)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+ void *cpu_addr, dma_addr_t dma_handle)
+{
+ struct dma_map_ops *dma_ops = get_dma_ops(dev);
+
+ dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
+}
+
+#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
+#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
+
+static inline void dma_cache_sync(struct device *dev, void *vaddr,
+ size_t size, enum dma_data_direction direction)
+{
+ unsigned long start = (unsigned long)vaddr;
+ unsigned long end = start + size;
+
+ switch (direction) {
+ case DMA_NONE:
+ BUG();
+ case DMA_FROM_DEVICE:
+ case DMA_BIDIRECTIONAL: /* writeback and invalidate */
+ __cpuc_dma_flush_range(start, end);
+ break;
+ case DMA_TO_DEVICE: /* writeback only */
+ __cpuc_dma_clean_range(start, end);
+ break;
+ }
+}
+
+#endif /* __KERNEL__ */
+#endif
diff --git a/arch/unicore32/include/asm/dma.h b/arch/unicore32/include/asm/dma.h
new file mode 100644
index 0000000..38dfff9
--- /dev/null
+++ b/arch/unicore32/include/asm/dma.h
@@ -0,0 +1,23 @@
+/*
+ * linux/arch/unicore32/include/asm/dma.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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 __UNICORE_DMA_H__
+#define __UNICORE_DMA_H__
+
+#include <asm/memory.h>
+#include <asm-generic/dma.h>
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#endif
+
+#endif /* __UNICORE_DMA_H__ */
diff --git a/arch/unicore32/include/asm/mach/dma.h b/arch/unicore32/include/asm/mach/dma.h
new file mode 100644
index 0000000..65ac656
--- /dev/null
+++ b/arch/unicore32/include/asm/mach/dma.h
@@ -0,0 +1,41 @@
+/*
+ * linux/arch/unicore32/mach-puv3/include/mach/dma.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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 __MACH_PUV3_DMA_H__
+#define __MACH_PUV3_DMA_H__
+
+/*
+ * The PKUnity has six internal DMA channels.
+ */
+#define MAX_DMA_CHANNELS 6
+
+typedef enum {
+ DMA_PRIO_HIGH = 0,
+ DMA_PRIO_MEDIUM = 1,
+ DMA_PRIO_LOW = 2
+} puv3_dma_prio;
+
+/*
+ * DMA registration
+ */
+
+extern int puv3_request_dma(char *name,
+ puv3_dma_prio prio,
+ void (*irq_handler)(int, void *),
+ void (*err_handler)(int, void *),
+ void *data);
+
+extern void puv3_free_dma(int dma_ch);
+
+#define puv3_stop_dma(ch) (DMAC_CONFIG(ch) &= ~DMAC_CONFIG_EN)
+#define puv3_resume_dma(ch) (DMAC_CONFIG(ch) |= DMAC_CONFIG_EN)
+
+#endif /* __MACH_PUV3_DMA_H__ */
diff --git a/arch/unicore32/include/asm/tlbflush.h b/arch/unicore32/include/asm/tlbflush.h
new file mode 100644
index 0000000..171e480
--- /dev/null
+++ b/arch/unicore32/include/asm/tlbflush.h
@@ -0,0 +1,192 @@
+/*
+ * linux/arch/unicore32/include/asm/tlbflush.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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 __UNICORE_TLBFLUSH_H__
+#define __UNICORE_TLBFLUSH_H__
+
+#ifndef __ASSEMBLY__
+
+#include <linux/sched.h>
+
+extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long,
+ struct vm_area_struct *);
+extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);
+
+/*
+ * TLB Management
+ * ==============
+ *
+ * The arch/unicore/mm/tlb-*.S files implement these methods.
+ *
+ * The TLB specific code is expected to perform whatever tests it
+ * needs to determine if it should invalidate the TLB for each
+ * call. Start addresses are inclusive and end addresses are
+ * exclusive; it is safe to round these addresses down.
+ *
+ * flush_tlb_all()
+ *
+ * Invalidate the entire TLB.
+ *
+ * flush_tlb_mm(mm)
+ *
+ * Invalidate all TLB entries in a particular address
+ * space.
+ * - mm - mm_struct describing address space
+ *
+ * flush_tlb_range(mm,start,end)
+ *
+ * Invalidate a range of TLB entries in the specified
+ * address space.
+ * - mm - mm_struct describing address space
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ *
+ * flush_tlb_page(vaddr,vma)
+ *
+ * Invalidate the specified page in the specified address range.
+ * - vaddr - virtual address (may not be aligned)
+ * - vma - vma_struct describing address range
+ *
+ * flush_kern_tlb_page(kaddr)
+ *
+ * Invalidate the TLB entry for the specified page. The address
+ * will be in the kernels virtual memory space. Current uses
+ * only require the D-TLB to be invalidated.
+ * - kaddr - Kernel virtual memory address
+ */
+
+static inline void local_flush_tlb_all(void)
+{
+ const int zero = 0;
+
+ /* TLB invalidate all */
+ asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (zero) : "cc");
+}
+
+static inline void local_flush_tlb_mm(struct mm_struct *mm)
+{
+ const int zero = 0;
+
+ if (cpumask_test_cpu(get_cpu(), mm_cpumask(mm))) {
+ /* TLB invalidate all */
+ asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (zero) : "cc");
+ }
+ put_cpu();
+}
+
+static inline void
+local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
+{
+ if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
+#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
+ /* iTLB invalidate page */
+ asm("movc p0.c6, %0, #5; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (uaddr & PAGE_MASK) : "cc");
+ /* dTLB invalidate page */
+ asm("movc p0.c6, %0, #3; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (uaddr & PAGE_MASK) : "cc");
+#else
+ /* TLB invalidate all */
+ asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (uaddr & PAGE_MASK) : "cc");
+#endif
+ }
+}
+
+static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
+{
+#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
+ /* iTLB invalidate page */
+ asm("movc p0.c6, %0, #5; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (kaddr & PAGE_MASK) : "cc");
+ /* dTLB invalidate page */
+ asm("movc p0.c6, %0, #3; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (kaddr & PAGE_MASK) : "cc");
+#else
+ /* TLB invalidate all */
+ asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (kaddr & PAGE_MASK) : "cc");
+#endif
+}
+
+/*
+ * flush_pmd_entry
+ *
+ * Flush a PMD entry (word aligned, or double-word aligned) to
+ * RAM if the TLB for the CPU we are running on requires this.
+ * This is typically used when we are creating PMD entries.
+ *
+ * clean_pmd_entry
+ *
+ * Clean (but don't drain the write buffer) if the CPU requires
+ * these operations. This is typically used when we are removing
+ * PMD entries.
+ */
+static inline void flush_pmd_entry(pmd_t *pmd)
+{
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ /* flush dcache line, see dcacheline_flush in proc-macros.S */
+ asm("mov r1, %0 << #20\n"
+ "ldw r2, =_text\n"
+ "add r2, r2, r1 >> #20\n"
+ "ldw r1, [r2+], #0x0000\n"
+ "ldw r1, [r2+], #0x1000\n"
+ "ldw r1, [r2+], #0x2000\n"
+ "ldw r1, [r2+], #0x3000\n"
+ : : "r" (pmd) : "r1", "r2");
+#else
+ /* flush dcache all */
+ asm("movc p0.c5, %0, #14; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (pmd) : "cc");
+#endif
+}
+
+static inline void clean_pmd_entry(pmd_t *pmd)
+{
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ /* clean dcache line */
+ asm("movc p0.c5, %0, #11; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (__pa(pmd) & ~(L1_CACHE_BYTES - 1)) : "cc");
+#else
+ /* clean dcache all */
+ asm("movc p0.c5, %0, #10; nop; nop; nop; nop; nop; nop; nop; nop"
+ : : "r" (pmd) : "cc");
+#endif
+}
+
+/*
+ * Convert calls to our calling convention.
+ */
+#define local_flush_tlb_range(vma, start, end) \
+ __cpu_flush_user_tlb_range(start, end, vma)
+#define local_flush_tlb_kernel_range(s, e) \
+ __cpu_flush_kern_tlb_range(s, e)
+
+#define flush_tlb_all local_flush_tlb_all
+#define flush_tlb_mm local_flush_tlb_mm
+#define flush_tlb_page local_flush_tlb_page
+#define flush_tlb_kernel_page local_flush_tlb_kernel_page
+#define flush_tlb_range local_flush_tlb_range
+#define flush_tlb_kernel_range local_flush_tlb_kernel_range
+
+/*
+ * if PG_dcache_clean is not set for the page, we need to ensure that any
+ * cache entries for the kernels virtual memory range are written
+ * back to the page.
+ */
+extern void update_mmu_cache(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep);
+
+#endif
+
+#endif
diff --git a/arch/unicore32/mm/cache-ucv2.S b/arch/unicore32/mm/cache-ucv2.S
new file mode 100644
index 0000000..ecaa172
--- /dev/null
+++ b/arch/unicore32/mm/cache-ucv2.S
@@ -0,0 +1,212 @@
+/*
+ * linux/arch/unicore32/mm/cache-ucv2.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ *
+ * This is the "shell" of the UniCore-v2 processor support.
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+
+#include "proc-macros.S"
+
+/*
+ * __cpuc_flush_icache_all()
+ * __cpuc_flush_kern_all()
+ * __cpuc_flush_user_all()
+ *
+ * Flush the entire cache.
+ */
+ENTRY(__cpuc_flush_icache_all)
+ /*FALLTHROUGH*/
+ENTRY(__cpuc_flush_kern_all)
+ /*FALLTHROUGH*/
+ENTRY(__cpuc_flush_user_all)
+ mov r0, #0
+ movc p0.c5, r0, #14 @ Dcache flush all
+ nop8
+
+ mov r0, #0
+ movc p0.c5, r0, #20 @ Icache invalidate all
+ nop8
+
+ mov pc, lr
+
+/*
+ * __cpuc_flush_user_range(start, end, flags)
+ *
+ * Flush a range of TLB entries in the specified address space.
+ *
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ * - flags - vm_area_struct flags describing address space
+ */
+ENTRY(__cpuc_flush_user_range)
+ cxor.a r2, #0
+ beq __cpuc_dma_flush_range
+
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ andn r0, r0, #CACHE_LINESIZE - 1 @ Safety check
+ sub r1, r1, r0
+ csub.a r1, #MAX_AREA_SIZE
+ bsg 2f
+
+ andn r1, r1, #CACHE_LINESIZE - 1
+ add r1, r1, #CACHE_LINESIZE
+
+101: dcacheline_flush r0, r11, r12
+
+ add r0, r0, #CACHE_LINESIZE
+ sub.a r1, r1, #CACHE_LINESIZE
+ bns 101b
+ b 3f
+#endif
+2: mov ip, #0
+ movc p0.c5, ip, #14 @ Dcache flush all
+ nop8
+
+3: mov ip, #0
+ movc p0.c5, ip, #20 @ Icache invalidate all
+ nop8
+
+ mov pc, lr
+
+/*
+ * __cpuc_coherent_kern_range(start,end)
+ * __cpuc_coherent_user_range(start,end)
+ *
+ * Ensure that the I and D caches are coherent within specified
+ * region. This is typically used when code has been written to
+ * a memory region, and will be executed.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+ENTRY(__cpuc_coherent_kern_range)
+ /* FALLTHROUGH */
+ENTRY(__cpuc_coherent_user_range)
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ andn r0, r0, #CACHE_LINESIZE - 1 @ Safety check
+ sub r1, r1, r0
+ csub.a r1, #MAX_AREA_SIZE
+ bsg 2f
+
+ andn r1, r1, #CACHE_LINESIZE - 1
+ add r1, r1, #CACHE_LINESIZE
+
+ @ r0 va2pa r10
+ mov r9, #PAGE_SZ
+ sub r9, r9, #1 @ PAGE_MASK
+101: va2pa r0, r10, r11, r12, r13, 2f @ r10 is PA
+ b 103f
+102: cand.a r0, r9
+ beq 101b
+
+103: movc p0.c5, r10, #11 @ Dcache clean line of R10
+ nop8
+
+ add r0, r0, #CACHE_LINESIZE
+ add r10, r10, #CACHE_LINESIZE
+ sub.a r1, r1, #CACHE_LINESIZE
+ bns 102b
+ b 3f
+#endif
+2: mov ip, #0
+ movc p0.c5, ip, #10 @ Dcache clean all
+ nop8
+
+3: mov ip, #0
+ movc p0.c5, ip, #20 @ Icache invalidate all
+ nop8
+
+ mov pc, lr
+
+/*
+ * __cpuc_flush_kern_dcache_area(void *addr, size_t size)
+ *
+ * - addr - kernel address
+ * - size - region size
+ */
+ENTRY(__cpuc_flush_kern_dcache_area)
+ mov ip, #0
+ movc p0.c5, ip, #14 @ Dcache flush all
+ nop8
+ mov pc, lr
+
+/*
+ * __cpuc_dma_clean_range(start,end)
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+ENTRY(__cpuc_dma_clean_range)
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ andn r0, r0, #CACHE_LINESIZE - 1
+ sub r1, r1, r0
+ andn r1, r1, #CACHE_LINESIZE - 1
+ add r1, r1, #CACHE_LINESIZE
+
+ csub.a r1, #MAX_AREA_SIZE
+ bsg 2f
+
+ @ r0 va2pa r10
+ mov r9, #PAGE_SZ
+ sub r9, r9, #1 @ PAGE_MASK
+101: va2pa r0, r10, r11, r12, r13, 2f @ r10 is PA
+ b 1f
+102: cand.a r0, r9
+ beq 101b
+
+1: movc p0.c5, r10, #11 @ Dcache clean line of R10
+ nop8
+ add r0, r0, #CACHE_LINESIZE
+ add r10, r10, #CACHE_LINESIZE
+ sub.a r1, r1, #CACHE_LINESIZE
+ bns 102b
+ mov pc, lr
+#endif
+2: mov ip, #0
+ movc p0.c5, ip, #10 @ Dcache clean all
+ nop8
+
+ mov pc, lr
+
+/*
+ * __cpuc_dma_inv_range(start,end)
+ * __cpuc_dma_flush_range(start,end)
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+__cpuc_dma_inv_range:
+ /* FALLTHROUGH */
+ENTRY(__cpuc_dma_flush_range)
+#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
+ andn r0, r0, #CACHE_LINESIZE - 1
+ sub r1, r1, r0
+ andn r1, r1, #CACHE_LINESIZE - 1
+ add r1, r1, #CACHE_LINESIZE
+
+ csub.a r1, #MAX_AREA_SIZE
+ bsg 2f
+
+ @ r0 va2pa r10
+101: dcacheline_flush r0, r11, r12
+
+ add r0, r0, #CACHE_LINESIZE
+ sub.a r1, r1, #CACHE_LINESIZE
+ bns 101b
+ mov pc, lr
+#endif
+2: mov ip, #0
+ movc p0.c5, ip, #14 @ Dcache flush all
+ nop8
+
+ mov pc, lr
+
diff --git a/arch/unicore32/mm/dma-swiotlb.c b/arch/unicore32/mm/dma-swiotlb.c
new file mode 100644
index 0000000..d521ffb
--- /dev/null
+++ b/arch/unicore32/mm/dma-swiotlb.c
@@ -0,0 +1,33 @@
+/*
+ * Contains routines needed to support swiotlb for UniCore32.
+ *
+ * Copyright (C) 2010 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#include <linux/pci.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
+#include <linux/bootmem.h>
+
+#include <asm/dma.h>
+
+struct dma_map_ops swiotlb_dma_map_ops = {
+ .alloc_coherent = swiotlb_alloc_coherent,
+ .free_coherent = swiotlb_free_coherent,
+ .map_sg = swiotlb_map_sg_attrs,
+ .unmap_sg = swiotlb_unmap_sg_attrs,
+ .dma_supported = swiotlb_dma_supported,
+ .map_page = swiotlb_map_page,
+ .unmap_page = swiotlb_unmap_page,
+ .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+ .sync_single_for_device = swiotlb_sync_single_for_device,
+ .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+ .sync_sg_for_device = swiotlb_sync_sg_for_device,
+ .mapping_error = swiotlb_dma_mapping_error,
+};
diff --git a/arch/unicore32/mm/flush.c b/arch/unicore32/mm/flush.c
new file mode 100644
index 0000000..93478cc
--- /dev/null
+++ b/arch/unicore32/mm/flush.c
@@ -0,0 +1,98 @@
+/*
+ * linux/arch/unicore32/mm/flush.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+
+#include <asm/cacheflush.h>
+#include <asm/system.h>
+#include <asm/tlbflush.h>
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+}
+
+void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ if (vma->vm_flags & VM_EXEC)
+ __flush_icache_all();
+}
+
+void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr,
+ unsigned long pfn)
+{
+}
+
+static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
+ unsigned long uaddr, void *kaddr, unsigned long len)
+{
+ /* VIPT non-aliasing D-cache */
+ if (vma->vm_flags & VM_EXEC) {
+ unsigned long addr = (unsigned long)kaddr;
+
+ __cpuc_coherent_kern_range(addr, addr + len);
+ }
+}
+
+/*
+ * Copy user data from/to a page which is mapped into a different
+ * processes address space. Really, we want to allow our "user
+ * space" model to handle this.
+ *
+ * Note that this code needs to run on the current CPU.
+ */
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+ unsigned long uaddr, void *dst, const void *src,
+ unsigned long len)
+{
+ memcpy(dst, src, len);
+ flush_ptrace_access(vma, page, uaddr, dst, len);
+}
+
+void __flush_dcache_page(struct address_space *mapping, struct page *page)
+{
+ /*
+ * Writeback any data associated with the kernel mapping of this
+ * page. This ensures that data in the physical page is mutually
+ * coherent with the kernels mapping.
+ */
+ __cpuc_flush_kern_dcache_area(page_address(page), PAGE_SIZE);
+}
+
+/*
+ * Ensure cache coherency between kernel mapping and userspace mapping
+ * of this page.
+ */
+void flush_dcache_page(struct page *page)
+{
+ struct address_space *mapping;
+
+ /*
+ * The zero page is never written to, so never has any dirty
+ * cache lines, and therefore never needs to be flushed.
+ */
+ if (page == ZERO_PAGE(0))
+ return;
+
+ mapping = page_mapping(page);
+
+ if (mapping && !mapping_mapped(mapping))
+ clear_bit(PG_dcache_clean, &page->flags);
+ else {
+ __flush_dcache_page(mapping, page);
+ if (mapping)
+ __flush_icache_all();
+ set_bit(PG_dcache_clean, &page->flags);
+ }
+}
+EXPORT_SYMBOL(flush_dcache_page);
diff --git a/arch/unicore32/mm/tlb-ucv2.S b/arch/unicore32/mm/tlb-ucv2.S
new file mode 100644
index 0000000..061d455
--- /dev/null
+++ b/arch/unicore32/mm/tlb-ucv2.S
@@ -0,0 +1,89 @@
+/*
+ * linux/arch/unicore32/mm/tlb-ucv2.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#include "proc-macros.S"
+
+/*
+ * __cpu_flush_user_tlb_range(start, end, vma)
+ *
+ * Invalidate a range of TLB entries in the specified address space.
+ *
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ * - vma - vma_struct describing address range
+ */
+ENTRY(__cpu_flush_user_tlb_range)
+#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
+ mov r0, r0 >> #PAGE_SHIFT @ align address
+ mov r0, r0 << #PAGE_SHIFT
+ vma_vm_flags r2, r2 @ get vma->vm_flags
+1:
+ movc p0.c6, r0, #3
+ nop8
+
+ cand.a r2, #VM_EXEC @ Executable area ?
+ beq 2f
+
+ movc p0.c6, r0, #5
+ nop8
+2:
+ add r0, r0, #PAGE_SZ
+ csub.a r0, r1
+ beb 1b
+#else
+ movc p0.c6, r0, #2
+ nop8
+
+ cand.a r2, #VM_EXEC @ Executable area ?
+ beq 2f
+
+ movc p0.c6, r0, #4
+ nop8
+2:
+#endif
+ mov pc, lr
+
+/*
+ * __cpu_flush_kern_tlb_range(start,end)
+ *
+ * Invalidate a range of kernel TLB entries
+ *
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ */
+ENTRY(__cpu_flush_kern_tlb_range)
+#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
+ mov r0, r0 >> #PAGE_SHIFT @ align address
+ mov r0, r0 << #PAGE_SHIFT
+1:
+ movc p0.c6, r0, #3
+ nop8
+
+ movc p0.c6, r0, #5
+ nop8
+
+ add r0, r0, #PAGE_SZ
+ csub.a r0, r1
+ beb 1b
+#else
+ movc p0.c6, r0, #2
+ nop8
+
+ movc p0.c6, r0, #4
+ nop8
+#endif
+ mov pc, lr
+
diff --git a/drivers/staging/puv3/puv3_dma.c b/drivers/staging/puv3/puv3_dma.c
new file mode 100644
index 0000000..7843a59
--- /dev/null
+++ b/drivers/staging/puv3/puv3_dma.c
@@ -0,0 +1,187 @@
+/*
+ * linux/drivers/pkunity/puv3/puv3_dma.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Maintained by GUAN Xue-tao <gxt@...c.pku.edu.cn>
+ * Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ *
+ * Based on: arch/arm/plat-pxa/dma.c
+ *
+ * Contributors & Additions/Fixes:
+ * 2009-04 GUAN Xue-tao: First version
+ *
+ * TODO:
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/mach/hardware.h>
+#include <asm/mach/dma.h>
+
+struct dma_channel {
+ char *name;
+ puv3_dma_prio prio;
+ void (*irq_handler)(int, void *);
+ void (*err_handler)(int, void *);
+ void *data;
+};
+
+static struct dma_channel dma_channels[MAX_DMA_CHANNELS];
+
+int puv3_request_dma(char *name, puv3_dma_prio prio,
+ void (*irq_handler)(int, void *),
+ void (*err_handler)(int, void *),
+ void *data)
+{
+ unsigned long flags;
+ int i, found = 0;
+
+ /* basic sanity checks */
+ if (!name)
+ return -EINVAL;
+
+ local_irq_save(flags);
+
+ do {
+ /* try grabbing a DMA channel with the requested priority */
+ for (i = 0; i < MAX_DMA_CHANNELS; i++) {
+ if ((dma_channels[i].prio == prio) &&
+ !dma_channels[i].name) {
+ found = 1;
+ break;
+ }
+ }
+ /* if requested prio group is full, try a hier priority */
+ } while (!found && prio--);
+
+ if (found) {
+ dma_channels[i].name = name;
+ dma_channels[i].irq_handler = irq_handler;
+ dma_channels[i].err_handler = err_handler;
+ dma_channels[i].data = data;
+ } else {
+ printk(KERN_WARNING "No more available DMA channels for %s\n",
+ name);
+ i = -ENODEV;
+ }
+
+ local_irq_restore(flags);
+ return i;
+}
+EXPORT_SYMBOL(puv3_request_dma);
+
+void puv3_free_dma(int dma_ch)
+{
+ unsigned long flags;
+
+ if (!dma_channels[dma_ch].name) {
+ printk(KERN_CRIT
+ "%s: trying to free channel %d which is already freed\n",
+ __func__, dma_ch);
+ return;
+ }
+
+ local_irq_save(flags);
+ dma_channels[dma_ch].name = NULL;
+ dma_channels[dma_ch].err_handler = NULL;
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(puv3_free_dma);
+
+static irqreturn_t dma_irq_handler(int irq, void *dev_id)
+{
+ int i, dint = DMAC_ITCSR;
+
+ for (i = 0; i < MAX_DMA_CHANNELS; i++) {
+ if (dint & DMAC_CHANNEL(i)) {
+ struct dma_channel *channel = &dma_channels[i];
+
+ /* Clear TC interrupt of channel i */
+ DMAC_ITCCR = DMAC_CHANNEL(i);
+ DMAC_ITCCR = 0;
+
+ if (channel->name && channel->irq_handler) {
+ channel->irq_handler(i, channel->data);
+ } else {
+ /*
+ * IRQ for an unregistered DMA channel:
+ * let's clear the interrupts and disable it.
+ */
+ printk(KERN_WARNING "spurious IRQ for"
+ " DMA channel %d\n", i);
+ }
+ }
+ }
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dma_err_handler(int irq, void *dev_id)
+{
+ int i, dint = DMAC_IESR;
+
+ for (i = 0; i < MAX_DMA_CHANNELS; i++) {
+ if (dint & DMAC_CHANNEL(i)) {
+ struct dma_channel *channel = &dma_channels[i];
+
+ /* Clear Err interrupt of channel i */
+ DMAC_IECR = DMAC_CHANNEL(i);
+ DMAC_IECR = 0;
+
+ if (channel->name && channel->err_handler) {
+ channel->err_handler(i, channel->data);
+ } else {
+ /*
+ * IRQ for an unregistered DMA channel:
+ * let's clear the interrupts and disable it.
+ */
+ printk(KERN_WARNING "spurious IRQ for"
+ " DMA channel %d\n", i);
+ }
+ }
+ }
+ return IRQ_HANDLED;
+}
+
+int __init puv3_init_dma(void)
+{
+ int i, ret;
+
+ /* dma channel priorities on v8 processors:
+ * ch 0 - 1 <--> (0) DMA_PRIO_HIGH
+ * ch 2 - 3 <--> (1) DMA_PRIO_MEDIUM
+ * ch 4 - 5 <--> (2) DMA_PRIO_LOW
+ */
+ for (i = 0; i < MAX_DMA_CHANNELS; i++) {
+ puv3_stop_dma(i);
+ dma_channels[i].name = NULL;
+ dma_channels[i].prio = min((i & 0x7) >> 1, DMA_PRIO_LOW);
+ }
+
+ ret = request_irq(IRQ_DMA, dma_irq_handler, 0, "DMA", NULL);
+ if (ret) {
+ printk(KERN_CRIT "Can't register IRQ for DMA\n");
+ return ret;
+ }
+
+ ret = request_irq(IRQ_DMAERR, dma_err_handler, 0, "DMAERR", NULL);
+ if (ret) {
+ printk(KERN_CRIT "Can't register IRQ for DMAERR\n");
+ free_irq(IRQ_DMA, "DMA");
+ return ret;
+ }
+
+ return 0;
+}
+
+postcore_initcall(puv3_init_dma);
--
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