diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/parisc/kernel/pci-dma.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/parisc/kernel/pci-dma.c | 596 |
1 files changed, 0 insertions, 596 deletions
diff --git a/ANDROID_3.4.5/arch/parisc/kernel/pci-dma.c b/ANDROID_3.4.5/arch/parisc/kernel/pci-dma.c deleted file mode 100644 index d87d1c47..00000000 --- a/ANDROID_3.4.5/arch/parisc/kernel/pci-dma.c +++ /dev/null @@ -1,596 +0,0 @@ -/* -** PARISC 1.1 Dynamic DMA mapping support. -** This implementation is for PA-RISC platforms that do not support -** I/O TLBs (aka DMA address translation hardware). -** See Documentation/DMA-API-HOWTO.txt for interface definitions. -** -** (c) Copyright 1999,2000 Hewlett-Packard Company -** (c) Copyright 2000 Grant Grundler -** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org> -** (c) Copyright 2000 John Marvin -** -** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c. -** (I assume it's from David Mosberger-Tang but there was no Copyright) -** -** AFAIK, all PA7100LC and PA7300LC platforms can use this code. -** -** - ggg -*/ - -#include <linux/init.h> -#include <linux/gfp.h> -#include <linux/mm.h> -#include <linux/pci.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/scatterlist.h> -#include <linux/export.h> - -#include <asm/cacheflush.h> -#include <asm/dma.h> /* for DMA_CHUNK_SIZE */ -#include <asm/io.h> -#include <asm/page.h> /* get_order */ -#include <asm/pgalloc.h> -#include <asm/uaccess.h> -#include <asm/tlbflush.h> /* for purge_tlb_*() macros */ - -static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; -static unsigned long pcxl_used_bytes __read_mostly = 0; -static unsigned long pcxl_used_pages __read_mostly = 0; - -extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */ -static spinlock_t pcxl_res_lock; -static char *pcxl_res_map; -static int pcxl_res_hint; -static int pcxl_res_size; - -#ifdef DEBUG_PCXL_RESOURCE -#define DBG_RES(x...) printk(x) -#else -#define DBG_RES(x...) -#endif - - -/* -** Dump a hex representation of the resource map. -*/ - -#ifdef DUMP_RESMAP -static -void dump_resmap(void) -{ - u_long *res_ptr = (unsigned long *)pcxl_res_map; - u_long i = 0; - - printk("res_map: "); - for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr) - printk("%08lx ", *res_ptr); - - printk("\n"); -} -#else -static inline void dump_resmap(void) {;} -#endif - -static int pa11_dma_supported( struct device *dev, u64 mask) -{ - return 1; -} - -static inline int map_pte_uncached(pte_t * pte, - unsigned long vaddr, - unsigned long size, unsigned long *paddr_ptr) -{ - unsigned long end; - unsigned long orig_vaddr = vaddr; - - vaddr &= ~PMD_MASK; - end = vaddr + size; - if (end > PMD_SIZE) - end = PMD_SIZE; - do { - unsigned long flags; - - if (!pte_none(*pte)) - printk(KERN_ERR "map_pte_uncached: page already exists\n"); - set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC)); - purge_tlb_start(flags); - pdtlb_kernel(orig_vaddr); - purge_tlb_end(flags); - vaddr += PAGE_SIZE; - orig_vaddr += PAGE_SIZE; - (*paddr_ptr) += PAGE_SIZE; - pte++; - } while (vaddr < end); - return 0; -} - -static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr, - unsigned long size, unsigned long *paddr_ptr) -{ - unsigned long end; - unsigned long orig_vaddr = vaddr; - - vaddr &= ~PGDIR_MASK; - end = vaddr + size; - if (end > PGDIR_SIZE) - end = PGDIR_SIZE; - do { - pte_t * pte = pte_alloc_kernel(pmd, vaddr); - if (!pte) - return -ENOMEM; - if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr)) - return -ENOMEM; - vaddr = (vaddr + PMD_SIZE) & PMD_MASK; - orig_vaddr += PMD_SIZE; - pmd++; - } while (vaddr < end); - return 0; -} - -static inline int map_uncached_pages(unsigned long vaddr, unsigned long size, - unsigned long paddr) -{ - pgd_t * dir; - unsigned long end = vaddr + size; - - dir = pgd_offset_k(vaddr); - do { - pmd_t *pmd; - - pmd = pmd_alloc(NULL, dir, vaddr); - if (!pmd) - return -ENOMEM; - if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr)) - return -ENOMEM; - vaddr = vaddr + PGDIR_SIZE; - dir++; - } while (vaddr && (vaddr < end)); - return 0; -} - -static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr, - unsigned long size) -{ - pte_t * pte; - unsigned long end; - unsigned long orig_vaddr = vaddr; - - if (pmd_none(*pmd)) - return; - if (pmd_bad(*pmd)) { - pmd_ERROR(*pmd); - pmd_clear(pmd); - return; - } - pte = pte_offset_map(pmd, vaddr); - vaddr &= ~PMD_MASK; - end = vaddr + size; - if (end > PMD_SIZE) - end = PMD_SIZE; - do { - unsigned long flags; - pte_t page = *pte; - - pte_clear(&init_mm, vaddr, pte); - purge_tlb_start(flags); - pdtlb_kernel(orig_vaddr); - purge_tlb_end(flags); - vaddr += PAGE_SIZE; - orig_vaddr += PAGE_SIZE; - pte++; - if (pte_none(page) || pte_present(page)) - continue; - printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n"); - } while (vaddr < end); -} - -static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr, - unsigned long size) -{ - pmd_t * pmd; - unsigned long end; - unsigned long orig_vaddr = vaddr; - - if (pgd_none(*dir)) - return; - if (pgd_bad(*dir)) { - pgd_ERROR(*dir); - pgd_clear(dir); - return; - } - pmd = pmd_offset(dir, vaddr); - vaddr &= ~PGDIR_MASK; - end = vaddr + size; - if (end > PGDIR_SIZE) - end = PGDIR_SIZE; - do { - unmap_uncached_pte(pmd, orig_vaddr, end - vaddr); - vaddr = (vaddr + PMD_SIZE) & PMD_MASK; - orig_vaddr += PMD_SIZE; - pmd++; - } while (vaddr < end); -} - -static void unmap_uncached_pages(unsigned long vaddr, unsigned long size) -{ - pgd_t * dir; - unsigned long end = vaddr + size; - - dir = pgd_offset_k(vaddr); - do { - unmap_uncached_pmd(dir, vaddr, end - vaddr); - vaddr = vaddr + PGDIR_SIZE; - dir++; - } while (vaddr && (vaddr < end)); -} - -#define PCXL_SEARCH_LOOP(idx, mask, size) \ - for(; res_ptr < res_end; ++res_ptr) \ - { \ - if(0 == ((*res_ptr) & mask)) { \ - *res_ptr |= mask; \ - idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \ - pcxl_res_hint = idx + (size >> 3); \ - goto resource_found; \ - } \ - } - -#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \ - u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \ - u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \ - PCXL_SEARCH_LOOP(idx, mask, size); \ - res_ptr = (u##size *)&pcxl_res_map[0]; \ - PCXL_SEARCH_LOOP(idx, mask, size); \ -} - -unsigned long -pcxl_alloc_range(size_t size) -{ - int res_idx; - u_long mask, flags; - unsigned int pages_needed = size >> PAGE_SHIFT; - - mask = (u_long) -1L; - mask >>= BITS_PER_LONG - pages_needed; - - DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", - size, pages_needed, mask); - - spin_lock_irqsave(&pcxl_res_lock, flags); - - if(pages_needed <= 8) { - PCXL_FIND_FREE_MAPPING(res_idx, mask, 8); - } else if(pages_needed <= 16) { - PCXL_FIND_FREE_MAPPING(res_idx, mask, 16); - } else if(pages_needed <= 32) { - PCXL_FIND_FREE_MAPPING(res_idx, mask, 32); - } else { - panic("%s: pcxl_alloc_range() Too many pages to map.\n", - __FILE__); - } - - dump_resmap(); - panic("%s: pcxl_alloc_range() out of dma mapping resources\n", - __FILE__); - -resource_found: - - DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n", - res_idx, mask, pcxl_res_hint); - - pcxl_used_pages += pages_needed; - pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1); - - spin_unlock_irqrestore(&pcxl_res_lock, flags); - - dump_resmap(); - - /* - ** return the corresponding vaddr in the pcxl dma map - */ - return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3))); -} - -#define PCXL_FREE_MAPPINGS(idx, m, size) \ - u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \ - /* BUG_ON((*res_ptr & m) != m); */ \ - *res_ptr &= ~m; - -/* -** clear bits in the pcxl resource map -*/ -static void -pcxl_free_range(unsigned long vaddr, size_t size) -{ - u_long mask, flags; - unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3); - unsigned int pages_mapped = size >> PAGE_SHIFT; - - mask = (u_long) -1L; - mask >>= BITS_PER_LONG - pages_mapped; - - DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", - res_idx, size, pages_mapped, mask); - - spin_lock_irqsave(&pcxl_res_lock, flags); - - if(pages_mapped <= 8) { - PCXL_FREE_MAPPINGS(res_idx, mask, 8); - } else if(pages_mapped <= 16) { - PCXL_FREE_MAPPINGS(res_idx, mask, 16); - } else if(pages_mapped <= 32) { - PCXL_FREE_MAPPINGS(res_idx, mask, 32); - } else { - panic("%s: pcxl_free_range() Too many pages to unmap.\n", - __FILE__); - } - - pcxl_used_pages -= (pages_mapped ? pages_mapped : 1); - pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1); - - spin_unlock_irqrestore(&pcxl_res_lock, flags); - - dump_resmap(); -} - -static int proc_pcxl_dma_show(struct seq_file *m, void *v) -{ -#if 0 - u_long i = 0; - unsigned long *res_ptr = (u_long *)pcxl_res_map; -#endif - unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */ - - seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n", - PCXL_DMA_MAP_SIZE, total_pages); - - seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size); - - seq_puts(m, " total: free: used: % used:\n"); - seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size, - pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes, - (pcxl_used_bytes * 100) / pcxl_res_size); - - seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages, - total_pages - pcxl_used_pages, pcxl_used_pages, - (pcxl_used_pages * 100 / total_pages)); - -#if 0 - seq_puts(m, "\nResource bitmap:"); - - for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) { - if ((i & 7) == 0) - seq_puts(m,"\n "); - seq_printf(m, "%s %08lx", buf, *res_ptr); - } -#endif - seq_putc(m, '\n'); - return 0; -} - -static int proc_pcxl_dma_open(struct inode *inode, struct file *file) -{ - return single_open(file, proc_pcxl_dma_show, NULL); -} - -static const struct file_operations proc_pcxl_dma_ops = { - .owner = THIS_MODULE, - .open = proc_pcxl_dma_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int __init -pcxl_dma_init(void) -{ - if (pcxl_dma_start == 0) - return 0; - - spin_lock_init(&pcxl_res_lock); - pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3); - pcxl_res_hint = 0; - pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL, - get_order(pcxl_res_size)); - memset(pcxl_res_map, 0, pcxl_res_size); - proc_gsc_root = proc_mkdir("gsc", NULL); - if (!proc_gsc_root) - printk(KERN_WARNING - "pcxl_dma_init: Unable to create gsc /proc dir entry\n"); - else { - struct proc_dir_entry* ent; - ent = proc_create("pcxl_dma", 0, proc_gsc_root, - &proc_pcxl_dma_ops); - if (!ent) - printk(KERN_WARNING - "pci-dma.c: Unable to create pcxl_dma /proc entry.\n"); - } - return 0; -} - -__initcall(pcxl_dma_init); - -static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) -{ - unsigned long vaddr; - unsigned long paddr; - int order; - - order = get_order(size); - size = 1 << (order + PAGE_SHIFT); - vaddr = pcxl_alloc_range(size); - paddr = __get_free_pages(flag, order); - flush_kernel_dcache_range(paddr, size); - paddr = __pa(paddr); - map_uncached_pages(vaddr, size, paddr); - *dma_handle = (dma_addr_t) paddr; - -#if 0 -/* This probably isn't needed to support EISA cards. -** ISA cards will certainly only support 24-bit DMA addressing. -** Not clear if we can, want, or need to support ISA. -*/ - if (!dev || *dev->coherent_dma_mask < 0xffffffff) - gfp |= GFP_DMA; -#endif - return (void *)vaddr; -} - -static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) -{ - int order; - - order = get_order(size); - size = 1 << (order + PAGE_SHIFT); - unmap_uncached_pages((unsigned long)vaddr, size); - pcxl_free_range((unsigned long)vaddr, size); - free_pages((unsigned long)__va(dma_handle), order); -} - -static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) addr, size); - return virt_to_phys(addr); -} - -static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - if (direction == DMA_TO_DEVICE) - return; - - /* - * For PCI_DMA_FROMDEVICE this flush is not necessary for the - * simple map/unmap case. However, it IS necessary if if - * pci_dma_sync_single_* has been called and the buffer reused. - */ - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); - return; -} - -static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - BUG_ON(direction == DMA_NONE); - - for (i = 0; i < nents; i++, sglist++ ) { - unsigned long vaddr = sg_virt_addr(sglist); - sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); - sg_dma_len(sglist) = sglist->length; - flush_kernel_dcache_range(vaddr, sglist->length); - } - return nents; -} - -static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - BUG_ON(direction == DMA_NONE); - - if (direction == DMA_TO_DEVICE) - return; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); - return; -} - -static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); -} - -static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size); -} - -static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); -} - -static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length); -} - -struct hppa_dma_ops pcxl_dma_ops = { - .dma_supported = pa11_dma_supported, - .alloc_consistent = pa11_dma_alloc_consistent, - .alloc_noncoherent = pa11_dma_alloc_consistent, - .free_consistent = pa11_dma_free_consistent, - .map_single = pa11_dma_map_single, - .unmap_single = pa11_dma_unmap_single, - .map_sg = pa11_dma_map_sg, - .unmap_sg = pa11_dma_unmap_sg, - .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, - .dma_sync_single_for_device = pa11_dma_sync_single_for_device, - .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, - .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, -}; - -static void *fail_alloc_consistent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - return NULL; -} - -static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - void *addr; - - addr = (void *)__get_free_pages(flag, get_order(size)); - if (addr) - *dma_handle = (dma_addr_t)virt_to_phys(addr); - - return addr; -} - -static void pa11_dma_free_noncoherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t iova) -{ - free_pages((unsigned long)vaddr, get_order(size)); - return; -} - -struct hppa_dma_ops pcx_dma_ops = { - .dma_supported = pa11_dma_supported, - .alloc_consistent = fail_alloc_consistent, - .alloc_noncoherent = pa11_dma_alloc_noncoherent, - .free_consistent = pa11_dma_free_noncoherent, - .map_single = pa11_dma_map_single, - .unmap_single = pa11_dma_unmap_single, - .map_sg = pa11_dma_map_sg, - .unmap_sg = pa11_dma_unmap_sg, - .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu, - .dma_sync_single_for_device = pa11_dma_sync_single_for_device, - .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, - .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device, -}; |