[mirror_ubuntu-bionic-kernel.git] / arch / parisc / kernel / pci-dma.c

/*
** 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");
		purge_tlb_start(flags);
		set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
		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(struct device *dev, size_t size,
		dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
{
	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(struct device *dev, size_t size, void *vaddr,
		dma_addr_t dma_handle, unsigned long attrs)
{
	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_page(struct device *dev, struct page *page,
		unsigned long offset, size_t size,
		enum dma_data_direction direction, unsigned long attrs)
{
	void *addr = page_address(page) + offset;
	BUG_ON(direction == DMA_NONE);

	flush_kernel_dcache_range((unsigned long) addr, size);
	return virt_to_phys(addr);
}

static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
		size_t size, enum dma_data_direction direction,
		unsigned long attrs)
{
	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,
		unsigned long attrs)
{
	int i;
	struct scatterlist *sg;

	BUG_ON(direction == DMA_NONE);

	for_each_sg(sglist, sg, nents, i) {
		unsigned long vaddr = (unsigned long)sg_virt(sg);

		sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
		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,
		unsigned long 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, unsigned long attrs)
{
	void *addr;

	if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0)
		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, unsigned long 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,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	** PARISC 1.1 Dynamic DMA mapping support.
	3	** This implementation is for PA-RISC platforms that do not support
	4	** I/O TLBs (aka DMA address translation hardware).
395cf969	5	** See Documentation/DMA-API-HOWTO.txt for interface definitions.
1da177e4 LT	6	**
	7	** (c) Copyright 1999,2000 Hewlett-Packard Company
	8	** (c) Copyright 2000 Grant Grundler
	9	** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
	10	** (c) Copyright 2000 John Marvin
	11	**
	12	** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
	13	** (I assume it's from David Mosberger-Tang but there was no Copyright)
	14	**
	15	** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
	16	**
	17	** - ggg
	18	*/
	19
	20	#include <linux/init.h>
5a0e3ad6	21	#include <linux/gfp.h>
1da177e4 LT	22	#include <linux/mm.h>
	23	#include <linux/pci.h>
	24	#include <linux/proc_fs.h>
27f282b9	25	#include <linux/seq_file.h>
1da177e4 LT	26	#include <linux/string.h>
1da177e4 LT	27	#include <linux/types.h>
b61e8f48	28	#include <linux/scatterlist.h>
a87df54e	29	#include <linux/export.h>
1da177e4 LT	30
	31	#include <asm/cacheflush.h>
	32	#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
	33	#include <asm/io.h>
	34	#include <asm/page.h> /* get_order */
	35	#include <asm/pgalloc.h>
	36	#include <asm/uaccess.h>
b8db8002	37	#include <asm/tlbflush.h> /* for purge_tlb_() macros /
1da177e4	38
8039de10	39	static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
8039de10 HD	40	static unsigned long pcxl_used_bytes __read_mostly = 0;
8039de10 HD	41	static unsigned long pcxl_used_pages __read_mostly = 0;
1da177e4 LT	42
	43	extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
	44	static spinlock_t pcxl_res_lock;
	45	static char *pcxl_res_map;
	46	static int pcxl_res_hint;
	47	static int pcxl_res_size;
	48
	49	#ifdef DEBUG_PCXL_RESOURCE
	50	#define DBG_RES(x...) printk(x)
	51	#else
	52	#define DBG_RES(x...)
	53	#endif
	54
	55
	56	/*
	57	** Dump a hex representation of the resource map.
	58	*/
	59
	60	#ifdef DUMP_RESMAP
	61	static
	62	void dump_resmap(void)
	63	{
	64	u_long res_ptr = (unsigned long )pcxl_res_map;
	65	u_long i = 0;
	66
	67	printk("res_map: ");
	68	for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
	69	printk("%08lx ", *res_ptr);
	70
	71	printk("\n");
	72	}
	73	#else
	74	static inline void dump_resmap(void) {;}
	75	#endif
	76
	77	static int pa11_dma_supported( struct device *dev, u64 mask)
	78	{
	79	return 1;
	80	}
	81
	82	static inline int map_pte_uncached(pte_t * pte,
	83	unsigned long vaddr,
	84	unsigned long size, unsigned long *paddr_ptr)
	85	{
	86	unsigned long end;
	87	unsigned long orig_vaddr = vaddr;
	88
	89	vaddr &= ~PMD_MASK;
	90	end = vaddr + size;
	91	if (end > PMD_SIZE)
	92	end = PMD_SIZE;
	93	do {
e82a3b75 HD	94	unsigned long flags;
e82a3b75 HD	95
1da177e4 LT	96	if (!pte_none(*pte))
1da177e4 LT	97	printk(KERN_ERR "map_pte_uncached: page already exists\n");
e82a3b75	98	purge_tlb_start(flags);
c0452fb9	99	set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
1da177e4	100	pdtlb_kernel(orig_vaddr);
e82a3b75	101	purge_tlb_end(flags);
1da177e4 LT	102	vaddr += PAGE_SIZE;
	103	orig_vaddr += PAGE_SIZE;
	104	(*paddr_ptr) += PAGE_SIZE;
	105	pte++;
	106	} while (vaddr < end);
	107	return 0;
	108	}
	109
	110	static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
	111	unsigned long size, unsigned long *paddr_ptr)
	112	{
	113	unsigned long end;
	114	unsigned long orig_vaddr = vaddr;
	115
	116	vaddr &= ~PGDIR_MASK;
	117	end = vaddr + size;
	118	if (end > PGDIR_SIZE)
	119	end = PGDIR_SIZE;
	120	do {
872fec16	121	pte_t * pte = pte_alloc_kernel(pmd, vaddr);
1da177e4 LT	122	if (!pte)
	123	return -ENOMEM;
	124	if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
	125	return -ENOMEM;
	126	vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
	127	orig_vaddr += PMD_SIZE;
	128	pmd++;
	129	} while (vaddr < end);
	130	return 0;
	131	}
	132
	133	static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
	134	unsigned long paddr)
	135	{
	136	pgd_t * dir;
	137	unsigned long end = vaddr + size;
	138
	139	dir = pgd_offset_k(vaddr);
	140	do {
	141	pmd_t *pmd;
	142
	143	pmd = pmd_alloc(NULL, dir, vaddr);
	144	if (!pmd)
	145	return -ENOMEM;
	146	if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
	147	return -ENOMEM;
	148	vaddr = vaddr + PGDIR_SIZE;
	149	dir++;
	150	} while (vaddr && (vaddr < end));
	151	return 0;
	152	}
	153
	154	static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
	155	unsigned long size)
	156	{
	157	pte_t * pte;
	158	unsigned long end;
	159	unsigned long orig_vaddr = vaddr;
	160
	161	if (pmd_none(*pmd))
	162	return;
	163	if (pmd_bad(*pmd)) {
	164	pmd_ERROR(*pmd);
	165	pmd_clear(pmd);
	166	return;
	167	}
	168	pte = pte_offset_map(pmd, vaddr);
	169	vaddr &= ~PMD_MASK;
	170	end = vaddr + size;
	171	if (end > PMD_SIZE)
	172	end = PMD_SIZE;
	173	do {
e82a3b75	174	unsigned long flags;
1da177e4	175	pte_t page = *pte;
e82a3b75	176
1da177e4	177	pte_clear(&init_mm, vaddr, pte);
e82a3b75	178	purge_tlb_start(flags);
1da177e4	179	pdtlb_kernel(orig_vaddr);
e82a3b75	180	purge_tlb_end(flags);
1da177e4 LT	181	vaddr += PAGE_SIZE;
	182	orig_vaddr += PAGE_SIZE;
	183	pte++;
	184	if (pte_none(page) \|\| pte_present(page))
	185	continue;
	186	printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
	187	} while (vaddr < end);
	188	}
	189
	190	static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
	191	unsigned long size)
	192	{
	193	pmd_t * pmd;
	194	unsigned long end;
	195	unsigned long orig_vaddr = vaddr;
	196
	197	if (pgd_none(*dir))
	198	return;
	199	if (pgd_bad(*dir)) {
	200	pgd_ERROR(*dir);
	201	pgd_clear(dir);
	202	return;
	203	}
	204	pmd = pmd_offset(dir, vaddr);
	205	vaddr &= ~PGDIR_MASK;
	206	end = vaddr + size;
	207	if (end > PGDIR_SIZE)
	208	end = PGDIR_SIZE;
	209	do {
	210	unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
	211	vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
	212	orig_vaddr += PMD_SIZE;
	213	pmd++;
	214	} while (vaddr < end);
	215	}
	216
	217	static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
	218	{
	219	pgd_t * dir;
	220	unsigned long end = vaddr + size;
	221
	222	dir = pgd_offset_k(vaddr);
	223	do {
	224	unmap_uncached_pmd(dir, vaddr, end - vaddr);
	225	vaddr = vaddr + PGDIR_SIZE;
	226	dir++;
	227	} while (vaddr && (vaddr < end));
	228	}
	229
	230	#define PCXL_SEARCH_LOOP(idx, mask, size) \
	231	for(; res_ptr < res_end; ++res_ptr) \
	232	{ \
	233	if(0 == ((*res_ptr) & mask)) { \
	234	*res_ptr \|= mask; \
	235	idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
	236	pcxl_res_hint = idx + (size >> 3); \
	237	goto resource_found; \
	238	} \
	239	}
	240
	241	#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
	242	u##size res_ptr = (u##size )&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
	243	u##size res_end = (u##size )&pcxl_res_map[pcxl_res_size]; \
	244	PCXL_SEARCH_LOOP(idx, mask, size); \
245	res_ptr = (u##size *)&pcxl_res_map[0]; \
246	PCXL_SEARCH_LOOP(idx, mask, size); \
247	}
248
249	unsigned long
250	pcxl_alloc_range(size_t size)
251	{
252	int res_idx;
253	u_long mask, flags;
254	unsigned int pages_needed = size >> PAGE_SHIFT;
255
256	mask = (u_long) -1L;
257	mask >>= BITS_PER_LONG - pages_needed;
258
259	DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
260	size, pages_needed, mask);
261
262	spin_lock_irqsave(&pcxl_res_lock, flags);
263
264	if(pages_needed <= 8) {
265	PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
266	} else if(pages_needed <= 16) {
267	PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
268	} else if(pages_needed <= 32) {
269	PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
270	} else {
271	panic("%s: pcxl_alloc_range() Too many pages to map.\n",
272	__FILE__);
273	}
274
275	dump_resmap();
276	panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
277	__FILE__);
278
279	resource_found:
280
281	DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
282	res_idx, mask, pcxl_res_hint);
283
284	pcxl_used_pages += pages_needed;
285	pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
286
287	spin_unlock_irqrestore(&pcxl_res_lock, flags);
288
289	dump_resmap();
290
291	/*
292	** return the corresponding vaddr in the pcxl dma map
293	*/
294	return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
295	}
296
297	#define PCXL_FREE_MAPPINGS(idx, m, size) \
298	u##size res_ptr = (u##size )&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
299	/* BUG_ON((res_ptr & m) != m); / \
300	*res_ptr &= ~m;
301
302	/*
303	** clear bits in the pcxl resource map
304	*/
305	static void
306	pcxl_free_range(unsigned long vaddr, size_t size)
307	{
308	u_long mask, flags;
309	unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
310	unsigned int pages_mapped = size >> PAGE_SHIFT;
311
312	mask = (u_long) -1L;
313	mask >>= BITS_PER_LONG - pages_mapped;
314
315	DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
316	res_idx, size, pages_mapped, mask);
317
318	spin_lock_irqsave(&pcxl_res_lock, flags);
319
320	if(pages_mapped <= 8) {
321	PCXL_FREE_MAPPINGS(res_idx, mask, 8);
322	} else if(pages_mapped <= 16) {
323	PCXL_FREE_MAPPINGS(res_idx, mask, 16);
324	} else if(pages_mapped <= 32) {
325	PCXL_FREE_MAPPINGS(res_idx, mask, 32);
326	} else {
327	panic("%s: pcxl_free_range() Too many pages to unmap.\n",
328	__FILE__);
329	}
330
331	pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
332	pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
333
334	spin_unlock_irqrestore(&pcxl_res_lock, flags);
335
336	dump_resmap();
337	}
338
27f282b9 AD	339	static int proc_pcxl_dma_show(struct seq_file m, void v)
	340	{
	341	#if 0
	342	u_long i = 0;
	343	unsigned long res_ptr = (u_long )pcxl_res_map;
	344	#endif
	345	unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
	346
	347	seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
	348	PCXL_DMA_MAP_SIZE, total_pages);
	349
	350	seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
	351
	352	seq_puts(m, " total: free: used: % used:\n");
	353	seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
	354	pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
	355	(pcxl_used_bytes * 100) / pcxl_res_size);
	356
	357	seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
	358	total_pages - pcxl_used_pages, pcxl_used_pages,
	359	(pcxl_used_pages * 100 / total_pages));
	360
	361	#if 0
	362	seq_puts(m, "\nResource bitmap:");
	363
	364	for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
	365	if ((i & 7) == 0)
	366	seq_puts(m,"\n ");
	367	seq_printf(m, "%s %08lx", buf, *res_ptr);
	368	}
	369	#endif
	370	seq_putc(m, '\n');
	371	return 0;
	372	}
	373
	374	static int proc_pcxl_dma_open(struct inode inode, struct file file)
	375	{
	376	return single_open(file, proc_pcxl_dma_show, NULL);
	377	}
	378
	379	static const struct file_operations proc_pcxl_dma_ops = {
	380	.owner = THIS_MODULE,
	381	.open = proc_pcxl_dma_open,
	382	.read = seq_read,
	383	.llseek = seq_lseek,
	384	.release = single_release,
	385	};
	386
1da177e4 LT	387	static int __init
	388	pcxl_dma_init(void)
	389	{
b8db8002 GG	390	if (pcxl_dma_start == 0)
b8db8002 GG	391	return 0;
1da177e4	392
b8db8002 GG	393	spin_lock_init(&pcxl_res_lock);
	394	pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
	395	pcxl_res_hint = 0;
	396	pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
1da177e4	397	get_order(pcxl_res_size));
b8db8002	398	memset(pcxl_res_map, 0, pcxl_res_size);
e51ec241	399	proc_gsc_root = proc_mkdir("gsc", NULL);
b8db8002 GG	400	if (!proc_gsc_root)
	401	printk(KERN_WARNING
	402	"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
	403	else {
	404	struct proc_dir_entry* ent;
6f1c86ec DL	405	ent = proc_create("pcxl_dma", 0, proc_gsc_root,
	406	&proc_pcxl_dma_ops);
	407	if (!ent)
b8db8002 GG	408	printk(KERN_WARNING
	409	"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
	410	}
	411	return 0;
1da177e4 LT	412	}
	413
	414	__initcall(pcxl_dma_init);
	415
79387179	416	static void pa11_dma_alloc(struct device dev, size_t size,
00085f1e	417	dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
1da177e4 LT	418	{
	419	unsigned long vaddr;
	420	unsigned long paddr;
	421	int order;
	422
	423	order = get_order(size);
	424	size = 1 << (order + PAGE_SHIFT);
	425	vaddr = pcxl_alloc_range(size);
	426	paddr = __get_free_pages(flag, order);
	427	flush_kernel_dcache_range(paddr, size);
	428	paddr = __pa(paddr);
	429	map_uncached_pages(vaddr, size, paddr);
	430	*dma_handle = (dma_addr_t) paddr;
	431
	432	#if 0
	433	/* This probably isn't needed to support EISA cards.
	434	** ISA cards will certainly only support 24-bit DMA addressing.
	435	** Not clear if we can, want, or need to support ISA.
	436	*/
	437	if (!dev \|\| *dev->coherent_dma_mask < 0xffffffff)
	438	gfp \|= GFP_DMA;
	439	#endif
	440	return (void *)vaddr;
	441	}
	442
79387179	443	static void pa11_dma_free(struct device dev, size_t size, void vaddr,
00085f1e	444	dma_addr_t dma_handle, unsigned long attrs)
1da177e4 LT	445	{
	446	int order;
	447
	448	order = get_order(size);
	449	size = 1 << (order + PAGE_SHIFT);
	450	unmap_uncached_pages((unsigned long)vaddr, size);
	451	pcxl_free_range((unsigned long)vaddr, size);
	452	free_pages((unsigned long)__va(dma_handle), order);
	453	}
	454
79387179 CH	455	static dma_addr_t pa11_dma_map_page(struct device dev, struct page page,
79387179 CH	456	unsigned long offset, size_t size,
00085f1e	457	enum dma_data_direction direction, unsigned long attrs)
1da177e4	458	{
79387179	459	void *addr = page_address(page) + offset;
8980a7ba	460	BUG_ON(direction == DMA_NONE);
1da177e4 LT	461
	462	flush_kernel_dcache_range((unsigned long) addr, size);
	463	return virt_to_phys(addr);
	464	}
	465
79387179 CH	466	static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
79387179 CH	467	size_t size, enum dma_data_direction direction,
00085f1e	468	unsigned long attrs)
1da177e4	469	{
8980a7ba	470	BUG_ON(direction == DMA_NONE);
1da177e4 LT	471
	472	if (direction == DMA_TO_DEVICE)
	473	return;
	474
	475	/*
	476	* For PCI_DMA_FROMDEVICE this flush is not necessary for the
	477	* simple map/unmap case. However, it IS necessary if if
	478	* pci_dma_sync_single_* has been called and the buffer reused.
	479	*/
	480
	481	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
	482	return;
	483	}
	484
79387179 CH	485	static int pa11_dma_map_sg(struct device dev, struct scatterlist sglist,
79387179 CH	486	int nents, enum dma_data_direction direction,
00085f1e	487	unsigned long attrs)
1da177e4 LT	488	{
1da177e4 LT	489	int i;
210bff6d	490	struct scatterlist *sg;
1da177e4	491
8980a7ba	492	BUG_ON(direction == DMA_NONE);
1da177e4	493
210bff6d AM	494	for_each_sg(sglist, sg, nents, i) {
	495	unsigned long vaddr = (unsigned long)sg_virt(sg);
	496
	497	sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
	498	sg_dma_len(sg) = sg->length;
	499	flush_kernel_dcache_range(vaddr, sg->length);
1da177e4 LT	500	}
	501	return nents;
	502	}
	503
79387179 CH	504	static void pa11_dma_unmap_sg(struct device dev, struct scatterlist sglist,
79387179 CH	505	int nents, enum dma_data_direction direction,
00085f1e	506	unsigned long attrs)
1da177e4 LT	507	{
1da177e4 LT	508	int i;
210bff6d	509	struct scatterlist *sg;
1da177e4	510
8980a7ba	511	BUG_ON(direction == DMA_NONE);
1da177e4 LT	512
	513	if (direction == DMA_TO_DEVICE)
	514	return;
	515
	516	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
	517
210bff6d AM	518	for_each_sg(sglist, sg, nents, i)
210bff6d AM	519	flush_kernel_vmap_range(sg_virt(sg), sg->length);
1da177e4 LT	520	return;
	521	}
	522
79387179 CH	523	static void pa11_dma_sync_single_for_cpu(struct device *dev,
	524	dma_addr_t dma_handle, size_t size,
	525	enum dma_data_direction direction)
1da177e4	526	{
8980a7ba	527	BUG_ON(direction == DMA_NONE);
1da177e4	528
79387179 CH	529	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
79387179 CH	530	size);
1da177e4 LT	531	}
1da177e4 LT	532
79387179 CH	533	static void pa11_dma_sync_single_for_device(struct device *dev,
	534	dma_addr_t dma_handle, size_t size,
	535	enum dma_data_direction direction)
1da177e4	536	{
8980a7ba	537	BUG_ON(direction == DMA_NONE);
1da177e4	538
79387179 CH	539	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
79387179 CH	540	size);
1da177e4 LT	541	}
	542
	543	static void pa11_dma_sync_sg_for_cpu(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
	544	{
	545	int i;
210bff6d	546	struct scatterlist *sg;
1da177e4 LT	547
	548	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
	549
210bff6d AM	550	for_each_sg(sglist, sg, nents, i)
210bff6d AM	551	flush_kernel_vmap_range(sg_virt(sg), sg->length);
1da177e4 LT	552	}
	553
	554	static void pa11_dma_sync_sg_for_device(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
	555	{
	556	int i;
210bff6d	557	struct scatterlist *sg;
1da177e4 LT	558
	559	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
	560
210bff6d AM	561	for_each_sg(sglist, sg, nents, i)
210bff6d AM	562	flush_kernel_vmap_range(sg_virt(sg), sg->length);
1da177e4 LT	563	}
1da177e4 LT	564
79387179	565	struct dma_map_ops pcxl_dma_ops = {
1da177e4	566	.dma_supported = pa11_dma_supported,
79387179 CH	567	.alloc = pa11_dma_alloc,
	568	.free = pa11_dma_free,
	569	.map_page = pa11_dma_map_page,
	570	.unmap_page = pa11_dma_unmap_page,
1da177e4 LT	571	.map_sg = pa11_dma_map_sg,
1da177e4 LT	572	.unmap_sg = pa11_dma_unmap_sg,
79387179 CH	573	.sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
	574	.sync_single_for_device = pa11_dma_sync_single_for_device,
	575	.sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
	576	.sync_sg_for_device = pa11_dma_sync_sg_for_device,
1da177e4 LT	577	};
1da177e4 LT	578
79387179	579	static void pcx_dma_alloc(struct device dev, size_t size,
00085f1e	580	dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
1da177e4	581	{
6f7d998e	582	void *addr;
1da177e4	583
00085f1e	584	if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0)
79387179 CH	585	return NULL;
79387179 CH	586
6f7d998e CL	587	addr = (void *)__get_free_pages(flag, get_order(size));
6f7d998e CL	588	if (addr)
1da177e4 LT	589	*dma_handle = (dma_addr_t)virt_to_phys(addr);
	590
	591	return addr;
	592	}
	593
79387179	594	static void pcx_dma_free(struct device dev, size_t size, void vaddr,
00085f1e	595	dma_addr_t iova, unsigned long attrs)
1da177e4	596	{
6f7d998e	597	free_pages((unsigned long)vaddr, get_order(size));
1da177e4 LT	598	return;
	599	}
	600
79387179	601	struct dma_map_ops pcx_dma_ops = {
1da177e4	602	.dma_supported = pa11_dma_supported,
79387179 CH	603	.alloc = pcx_dma_alloc,
	604	.free = pcx_dma_free,
	605	.map_page = pa11_dma_map_page,
	606	.unmap_page = pa11_dma_unmap_page,
1da177e4 LT	607	.map_sg = pa11_dma_map_sg,
1da177e4 LT	608	.unmap_sg = pa11_dma_unmap_sg,
79387179 CH	609	.sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
	610	.sync_single_for_device = pa11_dma_sync_single_for_device,
	611	.sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
	612	.sync_sg_for_device = pa11_dma_sync_sg_for_device,
1da177e4	613	};