614 строки
16 KiB
C
614 строки
16 KiB
C
/*
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** PARISC 1.1 Dynamic DMA mapping support.
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** This implementation is for PA-RISC platforms that do not support
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** I/O TLBs (aka DMA address translation hardware).
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** See Documentation/DMA-API-HOWTO.txt for interface definitions.
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**
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** (c) Copyright 1999,2000 Hewlett-Packard Company
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** (c) Copyright 2000 Grant Grundler
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** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
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** (c) Copyright 2000 John Marvin
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**
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** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
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** (I assume it's from David Mosberger-Tang but there was no Copyright)
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**
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** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
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**
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** - ggg
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*/
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <linux/export.h>
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#include <asm/cacheflush.h>
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#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
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#include <asm/io.h>
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#include <asm/page.h> /* get_order */
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#include <asm/pgalloc.h>
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#include <asm/uaccess.h>
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#include <asm/tlbflush.h> /* for purge_tlb_*() macros */
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static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
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static unsigned long pcxl_used_bytes __read_mostly = 0;
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static unsigned long pcxl_used_pages __read_mostly = 0;
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extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
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static spinlock_t pcxl_res_lock;
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static char *pcxl_res_map;
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static int pcxl_res_hint;
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static int pcxl_res_size;
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#ifdef DEBUG_PCXL_RESOURCE
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#define DBG_RES(x...) printk(x)
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#else
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#define DBG_RES(x...)
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#endif
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/*
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** Dump a hex representation of the resource map.
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*/
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#ifdef DUMP_RESMAP
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static
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void dump_resmap(void)
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{
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u_long *res_ptr = (unsigned long *)pcxl_res_map;
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u_long i = 0;
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printk("res_map: ");
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for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
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printk("%08lx ", *res_ptr);
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printk("\n");
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}
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#else
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static inline void dump_resmap(void) {;}
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#endif
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static int pa11_dma_supported( struct device *dev, u64 mask)
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{
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return 1;
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}
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static inline int map_pte_uncached(pte_t * pte,
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unsigned long vaddr,
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unsigned long size, unsigned long *paddr_ptr)
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{
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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vaddr &= ~PMD_MASK;
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end = vaddr + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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do {
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unsigned long flags;
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if (!pte_none(*pte))
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printk(KERN_ERR "map_pte_uncached: page already exists\n");
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set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
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purge_tlb_start(flags);
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pdtlb_kernel(orig_vaddr);
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purge_tlb_end(flags);
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vaddr += PAGE_SIZE;
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orig_vaddr += PAGE_SIZE;
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(*paddr_ptr) += PAGE_SIZE;
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pte++;
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} while (vaddr < end);
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return 0;
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}
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static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
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unsigned long size, unsigned long *paddr_ptr)
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{
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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vaddr &= ~PGDIR_MASK;
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end = vaddr + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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do {
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pte_t * pte = pte_alloc_kernel(pmd, vaddr);
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if (!pte)
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return -ENOMEM;
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if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
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return -ENOMEM;
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vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
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orig_vaddr += PMD_SIZE;
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pmd++;
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} while (vaddr < end);
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return 0;
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}
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static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
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unsigned long paddr)
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{
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pgd_t * dir;
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unsigned long end = vaddr + size;
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dir = pgd_offset_k(vaddr);
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do {
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pmd_t *pmd;
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pmd = pmd_alloc(NULL, dir, vaddr);
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if (!pmd)
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return -ENOMEM;
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if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
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return -ENOMEM;
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vaddr = vaddr + PGDIR_SIZE;
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dir++;
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} while (vaddr && (vaddr < end));
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return 0;
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}
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static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
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unsigned long size)
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{
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pte_t * pte;
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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if (pmd_none(*pmd))
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return;
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if (pmd_bad(*pmd)) {
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pmd_ERROR(*pmd);
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pmd_clear(pmd);
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return;
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}
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pte = pte_offset_map(pmd, vaddr);
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vaddr &= ~PMD_MASK;
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end = vaddr + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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do {
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unsigned long flags;
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pte_t page = *pte;
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pte_clear(&init_mm, vaddr, pte);
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purge_tlb_start(flags);
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pdtlb_kernel(orig_vaddr);
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purge_tlb_end(flags);
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vaddr += PAGE_SIZE;
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orig_vaddr += PAGE_SIZE;
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pte++;
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if (pte_none(page) || pte_present(page))
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continue;
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printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
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} while (vaddr < end);
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}
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static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
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unsigned long size)
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{
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pmd_t * pmd;
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unsigned long end;
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unsigned long orig_vaddr = vaddr;
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if (pgd_none(*dir))
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return;
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if (pgd_bad(*dir)) {
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pgd_ERROR(*dir);
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pgd_clear(dir);
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return;
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}
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pmd = pmd_offset(dir, vaddr);
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vaddr &= ~PGDIR_MASK;
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end = vaddr + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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do {
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unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
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vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
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orig_vaddr += PMD_SIZE;
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pmd++;
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} while (vaddr < end);
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}
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static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
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{
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pgd_t * dir;
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unsigned long end = vaddr + size;
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dir = pgd_offset_k(vaddr);
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do {
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unmap_uncached_pmd(dir, vaddr, end - vaddr);
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vaddr = vaddr + PGDIR_SIZE;
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dir++;
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} while (vaddr && (vaddr < end));
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}
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#define PCXL_SEARCH_LOOP(idx, mask, size) \
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for(; res_ptr < res_end; ++res_ptr) \
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{ \
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if(0 == ((*res_ptr) & mask)) { \
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*res_ptr |= mask; \
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idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
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pcxl_res_hint = idx + (size >> 3); \
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goto resource_found; \
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} \
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}
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#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
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u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
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u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
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PCXL_SEARCH_LOOP(idx, mask, size); \
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res_ptr = (u##size *)&pcxl_res_map[0]; \
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PCXL_SEARCH_LOOP(idx, mask, size); \
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}
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unsigned long
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pcxl_alloc_range(size_t size)
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{
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int res_idx;
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u_long mask, flags;
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unsigned int pages_needed = size >> PAGE_SHIFT;
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mask = (u_long) -1L;
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mask >>= BITS_PER_LONG - pages_needed;
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DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
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size, pages_needed, mask);
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spin_lock_irqsave(&pcxl_res_lock, flags);
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if(pages_needed <= 8) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
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} else if(pages_needed <= 16) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
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} else if(pages_needed <= 32) {
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PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
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} else {
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panic("%s: pcxl_alloc_range() Too many pages to map.\n",
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__FILE__);
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}
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dump_resmap();
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panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
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__FILE__);
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resource_found:
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DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
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res_idx, mask, pcxl_res_hint);
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pcxl_used_pages += pages_needed;
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pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
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spin_unlock_irqrestore(&pcxl_res_lock, flags);
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dump_resmap();
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/*
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** return the corresponding vaddr in the pcxl dma map
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*/
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return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
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}
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#define PCXL_FREE_MAPPINGS(idx, m, size) \
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u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
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/* BUG_ON((*res_ptr & m) != m); */ \
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*res_ptr &= ~m;
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/*
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** clear bits in the pcxl resource map
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*/
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static void
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pcxl_free_range(unsigned long vaddr, size_t size)
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{
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u_long mask, flags;
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unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
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unsigned int pages_mapped = size >> PAGE_SHIFT;
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mask = (u_long) -1L;
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mask >>= BITS_PER_LONG - pages_mapped;
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DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
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res_idx, size, pages_mapped, mask);
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spin_lock_irqsave(&pcxl_res_lock, flags);
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if(pages_mapped <= 8) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 8);
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} else if(pages_mapped <= 16) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 16);
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} else if(pages_mapped <= 32) {
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PCXL_FREE_MAPPINGS(res_idx, mask, 32);
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} else {
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panic("%s: pcxl_free_range() Too many pages to unmap.\n",
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__FILE__);
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}
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pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
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pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
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spin_unlock_irqrestore(&pcxl_res_lock, flags);
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dump_resmap();
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}
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static int proc_pcxl_dma_show(struct seq_file *m, void *v)
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{
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#if 0
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u_long i = 0;
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unsigned long *res_ptr = (u_long *)pcxl_res_map;
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#endif
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unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
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seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
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PCXL_DMA_MAP_SIZE, total_pages);
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seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
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seq_puts(m, " total: free: used: % used:\n");
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seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
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pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
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(pcxl_used_bytes * 100) / pcxl_res_size);
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seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
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total_pages - pcxl_used_pages, pcxl_used_pages,
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(pcxl_used_pages * 100 / total_pages));
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#if 0
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seq_puts(m, "\nResource bitmap:");
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for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
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if ((i & 7) == 0)
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seq_puts(m,"\n ");
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seq_printf(m, "%s %08lx", buf, *res_ptr);
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}
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#endif
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seq_putc(m, '\n');
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return 0;
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}
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static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
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{
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return single_open(file, proc_pcxl_dma_show, NULL);
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}
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static const struct file_operations proc_pcxl_dma_ops = {
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.owner = THIS_MODULE,
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.open = proc_pcxl_dma_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init
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pcxl_dma_init(void)
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{
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if (pcxl_dma_start == 0)
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return 0;
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spin_lock_init(&pcxl_res_lock);
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pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
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pcxl_res_hint = 0;
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pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
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get_order(pcxl_res_size));
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memset(pcxl_res_map, 0, pcxl_res_size);
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proc_gsc_root = proc_mkdir("gsc", NULL);
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if (!proc_gsc_root)
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printk(KERN_WARNING
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"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
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else {
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struct proc_dir_entry* ent;
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ent = proc_create("pcxl_dma", 0, proc_gsc_root,
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&proc_pcxl_dma_ops);
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if (!ent)
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printk(KERN_WARNING
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"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
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}
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return 0;
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}
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__initcall(pcxl_dma_init);
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static void *pa11_dma_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs)
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{
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unsigned long vaddr;
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unsigned long paddr;
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int order;
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order = get_order(size);
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size = 1 << (order + PAGE_SHIFT);
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vaddr = pcxl_alloc_range(size);
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paddr = __get_free_pages(flag, order);
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flush_kernel_dcache_range(paddr, size);
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paddr = __pa(paddr);
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map_uncached_pages(vaddr, size, paddr);
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*dma_handle = (dma_addr_t) paddr;
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#if 0
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/* This probably isn't needed to support EISA cards.
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** ISA cards will certainly only support 24-bit DMA addressing.
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** Not clear if we can, want, or need to support ISA.
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*/
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if (!dev || *dev->coherent_dma_mask < 0xffffffff)
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gfp |= GFP_DMA;
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#endif
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return (void *)vaddr;
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}
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static void pa11_dma_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle, struct dma_attrs *attrs)
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{
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int order;
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order = get_order(size);
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size = 1 << (order + PAGE_SHIFT);
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unmap_uncached_pages((unsigned long)vaddr, size);
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pcxl_free_range((unsigned long)vaddr, size);
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free_pages((unsigned long)__va(dma_handle), order);
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}
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static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction, struct dma_attrs *attrs)
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{
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void *addr = page_address(page) + offset;
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BUG_ON(direction == DMA_NONE);
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flush_kernel_dcache_range((unsigned long) addr, size);
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return virt_to_phys(addr);
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}
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static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction,
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struct dma_attrs *attrs)
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{
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BUG_ON(direction == DMA_NONE);
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if (direction == DMA_TO_DEVICE)
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return;
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/*
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* For PCI_DMA_FROMDEVICE this flush is not necessary for the
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* simple map/unmap case. However, it IS necessary if if
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* pci_dma_sync_single_* has been called and the buffer reused.
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*/
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flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
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return;
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}
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static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
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int nents, enum dma_data_direction direction,
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struct dma_attrs *attrs)
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{
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int i;
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struct scatterlist *sg;
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BUG_ON(direction == DMA_NONE);
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for_each_sg(sglist, sg, nents, i) {
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unsigned long vaddr = (unsigned long)sg_virt(sg);
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sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
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sg_dma_len(sg) = sg->length;
|
|
flush_kernel_dcache_range(vaddr, sg->length);
|
|
}
|
|
return nents;
|
|
}
|
|
|
|
static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nents, enum dma_data_direction direction,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
int i;
|
|
struct scatterlist *sg;
|
|
|
|
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_each_sg(sglist, sg, nents, i)
|
|
flush_kernel_vmap_range(sg_virt(sg), sg->length);
|
|
return;
|
|
}
|
|
|
|
static void pa11_dma_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
|
|
size);
|
|
}
|
|
|
|
static void pa11_dma_sync_single_for_device(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
|
|
size);
|
|
}
|
|
|
|
static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
struct scatterlist *sg;
|
|
|
|
/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
|
|
|
|
for_each_sg(sglist, sg, nents, i)
|
|
flush_kernel_vmap_range(sg_virt(sg), sg->length);
|
|
}
|
|
|
|
static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
|
|
{
|
|
int i;
|
|
struct scatterlist *sg;
|
|
|
|
/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
|
|
|
|
for_each_sg(sglist, sg, nents, i)
|
|
flush_kernel_vmap_range(sg_virt(sg), sg->length);
|
|
}
|
|
|
|
struct dma_map_ops pcxl_dma_ops = {
|
|
.dma_supported = pa11_dma_supported,
|
|
.alloc = pa11_dma_alloc,
|
|
.free = pa11_dma_free,
|
|
.map_page = pa11_dma_map_page,
|
|
.unmap_page = pa11_dma_unmap_page,
|
|
.map_sg = pa11_dma_map_sg,
|
|
.unmap_sg = pa11_dma_unmap_sg,
|
|
.sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
|
|
.sync_single_for_device = pa11_dma_sync_single_for_device,
|
|
.sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
|
|
.sync_sg_for_device = pa11_dma_sync_sg_for_device,
|
|
};
|
|
|
|
static void *pcx_dma_alloc(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs)
|
|
{
|
|
void *addr;
|
|
|
|
if (!dma_get_attr(DMA_ATTR_NON_CONSISTENT, attrs))
|
|
return NULL;
|
|
|
|
addr = (void *)__get_free_pages(flag, get_order(size));
|
|
if (addr)
|
|
*dma_handle = (dma_addr_t)virt_to_phys(addr);
|
|
|
|
return addr;
|
|
}
|
|
|
|
static void pcx_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t iova, struct dma_attrs *attrs)
|
|
{
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
return;
|
|
}
|
|
|
|
struct dma_map_ops pcx_dma_ops = {
|
|
.dma_supported = pa11_dma_supported,
|
|
.alloc = pcx_dma_alloc,
|
|
.free = pcx_dma_free,
|
|
.map_page = pa11_dma_map_page,
|
|
.unmap_page = pa11_dma_unmap_page,
|
|
.map_sg = pa11_dma_map_sg,
|
|
.unmap_sg = pa11_dma_unmap_sg,
|
|
.sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
|
|
.sync_single_for_device = pa11_dma_sync_single_for_device,
|
|
.sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
|
|
.sync_sg_for_device = pa11_dma_sync_sg_for_device,
|
|
};
|