[deliverable/linux.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-mapping.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/mm.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/scatterlist.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 {
		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();
		pdtlb_kernel(orig_vaddr);
		purge_tlb_end();
		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 {
		pte_t page = *pte;
		pte_clear(&init_mm, vaddr, pte);
		purge_tlb_start();
		pdtlb_kernel(orig_vaddr);
		purge_tlb_end();
		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 = create_proc_entry("pcxl_dma", 0, proc_gsc_root);
		if (ent)
			ent->proc_fops = &proc_pcxl_dma_ops;
		else
			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)
{
	if (direction == DMA_NONE) {
		printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
		BUG();
	}

	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)
{
	if (direction == DMA_NONE) {
		printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
		BUG();
	}

	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;

	if (direction == DMA_NONE)
	    BUG();

	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;

	if (direction == DMA_NONE)
	    BUG();

	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)
{
	if (direction == DMA_NONE)
	    BUG();

	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)
{
	if (direction == DMA_NONE)
	    BUG();

	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,
};
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).
	5	** See Documentation/DMA-mapping.txt for interface definitions.
	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>
	21	#include <linux/mm.h>
	22	#include <linux/pci.h>
	23	#include <linux/proc_fs.h>
27f282b9	24	#include <linux/seq_file.h>
1da177e4 LT	25	#include <linux/slab.h>
	26	#include <linux/string.h>
	27	#include <linux/types.h>
b61e8f48	28	#include <linux/scatterlist.h>
1da177e4 LT	29
	30	#include <asm/cacheflush.h>
	31	#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
	32	#include <asm/io.h>
	33	#include <asm/page.h> /* get_order */
	34	#include <asm/pgalloc.h>
	35	#include <asm/uaccess.h>
b8db8002	36	#include <asm/tlbflush.h> /* for purge_tlb_() macros /
1da177e4	37
8039de10	38	static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
8039de10 HD	39	static unsigned long pcxl_used_bytes __read_mostly = 0;
8039de10 HD	40	static unsigned long pcxl_used_pages __read_mostly = 0;
1da177e4 LT	41
	42	extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
	43	static spinlock_t pcxl_res_lock;
	44	static char *pcxl_res_map;
	45	static int pcxl_res_hint;
	46	static int pcxl_res_size;
	47
	48	#ifdef DEBUG_PCXL_RESOURCE
	49	#define DBG_RES(x...) printk(x)
	50	#else
	51	#define DBG_RES(x...)
	52	#endif
	53
	54
	55	/*
	56	** Dump a hex representation of the resource map.
	57	*/
	58
	59	#ifdef DUMP_RESMAP
	60	static
	61	void dump_resmap(void)
	62	{
	63	u_long res_ptr = (unsigned long )pcxl_res_map;
	64	u_long i = 0;
	65
	66	printk("res_map: ");
	67	for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
	68	printk("%08lx ", *res_ptr);
	69
	70	printk("\n");
	71	}
	72	#else
	73	static inline void dump_resmap(void) {;}
	74	#endif
	75
	76	static int pa11_dma_supported( struct device *dev, u64 mask)
	77	{
	78	return 1;
	79	}
	80
	81	static inline int map_pte_uncached(pte_t * pte,
	82	unsigned long vaddr,
	83	unsigned long size, unsigned long *paddr_ptr)
	84	{
	85	unsigned long end;
	86	unsigned long orig_vaddr = vaddr;
	87
	88	vaddr &= ~PMD_MASK;
	89	end = vaddr + size;
	90	if (end > PMD_SIZE)
	91	end = PMD_SIZE;
	92	do {
	93	if (!pte_none(*pte))
	94	printk(KERN_ERR "map_pte_uncached: page already exists\n");
	95	set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
	96	purge_tlb_start();
	97	pdtlb_kernel(orig_vaddr);
	98	purge_tlb_end();
	99	vaddr += PAGE_SIZE;
	100	orig_vaddr += PAGE_SIZE;
	101	(*paddr_ptr) += PAGE_SIZE;
	102	pte++;
	103	} while (vaddr < end);
	104	return 0;
105	}
106
107	static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
108	unsigned long size, unsigned long *paddr_ptr)
109	{
110	unsigned long end;
111	unsigned long orig_vaddr = vaddr;
112
113	vaddr &= ~PGDIR_MASK;
114	end = vaddr + size;
115	if (end > PGDIR_SIZE)
116	end = PGDIR_SIZE;
117	do {
872fec16	118	pte_t * pte = pte_alloc_kernel(pmd, vaddr);
1da177e4 LT	119	if (!pte)
	120	return -ENOMEM;
	121	if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
	122	return -ENOMEM;
	123	vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
	124	orig_vaddr += PMD_SIZE;
	125	pmd++;
	126	} while (vaddr < end);
	127	return 0;
	128	}
	129
	130	static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
	131	unsigned long paddr)
	132	{
	133	pgd_t * dir;
	134	unsigned long end = vaddr + size;
	135
	136	dir = pgd_offset_k(vaddr);
	137	do {
	138	pmd_t *pmd;
	139
	140	pmd = pmd_alloc(NULL, dir, vaddr);
	141	if (!pmd)
	142	return -ENOMEM;
	143	if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
	144	return -ENOMEM;
	145	vaddr = vaddr + PGDIR_SIZE;
	146	dir++;
	147	} while (vaddr && (vaddr < end));
	148	return 0;
	149	}
	150
	151	static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
	152	unsigned long size)
	153	{
	154	pte_t * pte;
	155	unsigned long end;
	156	unsigned long orig_vaddr = vaddr;
	157
	158	if (pmd_none(*pmd))
	159	return;
	160	if (pmd_bad(*pmd)) {
	161	pmd_ERROR(*pmd);
	162	pmd_clear(pmd);
	163	return;
	164	}
	165	pte = pte_offset_map(pmd, vaddr);
	166	vaddr &= ~PMD_MASK;
	167	end = vaddr + size;
	168	if (end > PMD_SIZE)
	169	end = PMD_SIZE;
	170	do {
	171	pte_t page = *pte;
	172	pte_clear(&init_mm, vaddr, pte);
	173	purge_tlb_start();
	174	pdtlb_kernel(orig_vaddr);
	175	purge_tlb_end();
	176	vaddr += PAGE_SIZE;
	177	orig_vaddr += PAGE_SIZE;
	178	pte++;
	179	if (pte_none(page) \|\| pte_present(page))
	180	continue;
	181	printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
	182	} while (vaddr < end);
183	}
184
185	static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
186	unsigned long size)
187	{
188	pmd_t * pmd;
189	unsigned long end;
190	unsigned long orig_vaddr = vaddr;
191
192	if (pgd_none(*dir))
193	return;
194	if (pgd_bad(*dir)) {
195	pgd_ERROR(*dir);
196	pgd_clear(dir);
197	return;
198	}
199	pmd = pmd_offset(dir, vaddr);
200	vaddr &= ~PGDIR_MASK;
201	end = vaddr + size;
202	if (end > PGDIR_SIZE)
203	end = PGDIR_SIZE;
204	do {
205	unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
206	vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
207	orig_vaddr += PMD_SIZE;
208	pmd++;
209	} while (vaddr < end);
210	}
211
212	static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
213	{
214	pgd_t * dir;
215	unsigned long end = vaddr + size;
216
217	dir = pgd_offset_k(vaddr);
218	do {
219	unmap_uncached_pmd(dir, vaddr, end - vaddr);
220	vaddr = vaddr + PGDIR_SIZE;
221	dir++;
222	} while (vaddr && (vaddr < end));
223	}
224
225	#define PCXL_SEARCH_LOOP(idx, mask, size) \
226	for(; res_ptr < res_end; ++res_ptr) \
227	{ \
228	if(0 == ((*res_ptr) & mask)) { \
229	*res_ptr \|= mask; \
230	idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
231	pcxl_res_hint = idx + (size >> 3); \
232	goto resource_found; \
233	} \
234	}
235
236	#define PCXL_FIND_FREE_MAPPING(idx, mask, size) { \
237	u##size res_ptr = (u##size )&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
238	u##size res_end = (u##size )&pcxl_res_map[pcxl_res_size]; \
239	PCXL_SEARCH_LOOP(idx, mask, size); \
240	res_ptr = (u##size *)&pcxl_res_map[0]; \
241	PCXL_SEARCH_LOOP(idx, mask, size); \
242	}
243
244	unsigned long
245	pcxl_alloc_range(size_t size)
246	{
247	int res_idx;
248	u_long mask, flags;
249	unsigned int pages_needed = size >> PAGE_SHIFT;
250
251	mask = (u_long) -1L;
252	mask >>= BITS_PER_LONG - pages_needed;
253
254	DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
255	size, pages_needed, mask);
256
257	spin_lock_irqsave(&pcxl_res_lock, flags);
258
259	if(pages_needed <= 8) {
260	PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
261	} else if(pages_needed <= 16) {
262	PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
263	} else if(pages_needed <= 32) {
264	PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
265	} else {
266	panic("%s: pcxl_alloc_range() Too many pages to map.\n",
267	__FILE__);
268	}
269
270	dump_resmap();
271	panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
272	__FILE__);
273
274	resource_found:
275
276	DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
277	res_idx, mask, pcxl_res_hint);
278
279	pcxl_used_pages += pages_needed;
280	pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
281
282	spin_unlock_irqrestore(&pcxl_res_lock, flags);
283
284	dump_resmap();
285
286	/*
287	** return the corresponding vaddr in the pcxl dma map
288	*/
289	return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
290	}
291
292	#define PCXL_FREE_MAPPINGS(idx, m, size) \
293	u##size res_ptr = (u##size )&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
294	/* BUG_ON((res_ptr & m) != m); / \
295	*res_ptr &= ~m;
296
297	/*
298	** clear bits in the pcxl resource map
299	*/
300	static void
301	pcxl_free_range(unsigned long vaddr, size_t size)
302	{
303	u_long mask, flags;
304	unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
305	unsigned int pages_mapped = size >> PAGE_SHIFT;
306
307	mask = (u_long) -1L;
308	mask >>= BITS_PER_LONG - pages_mapped;
309
310	DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
311	res_idx, size, pages_mapped, mask);
312
313	spin_lock_irqsave(&pcxl_res_lock, flags);
314
315	if(pages_mapped <= 8) {
316	PCXL_FREE_MAPPINGS(res_idx, mask, 8);
317	} else if(pages_mapped <= 16) {
318	PCXL_FREE_MAPPINGS(res_idx, mask, 16);
319	} else if(pages_mapped <= 32) {
320	PCXL_FREE_MAPPINGS(res_idx, mask, 32);
321	} else {
322	panic("%s: pcxl_free_range() Too many pages to unmap.\n",
323	__FILE__);
324	}
325
326	pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
327	pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
328
329	spin_unlock_irqrestore(&pcxl_res_lock, flags);
330
331	dump_resmap();
332	}
333
27f282b9 AD	334	static int proc_pcxl_dma_show(struct seq_file m, void v)
	335	{
	336	#if 0
	337	u_long i = 0;
	338	unsigned long res_ptr = (u_long )pcxl_res_map;
	339	#endif
	340	unsigned long total_pages = pcxl_res_size << 3; /* 8 bits per byte */
	341
	342	seq_printf(m, "\nDMA Mapping Area size : %d bytes (%ld pages)\n",
	343	PCXL_DMA_MAP_SIZE, total_pages);
	344
	345	seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
	346
	347	seq_puts(m, " total: free: used: % used:\n");
	348	seq_printf(m, "blocks %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
	349	pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
	350	(pcxl_used_bytes * 100) / pcxl_res_size);
	351
	352	seq_printf(m, "pages %8ld %8ld %8ld %8ld%%\n", total_pages,
	353	total_pages - pcxl_used_pages, pcxl_used_pages,
	354	(pcxl_used_pages * 100 / total_pages));
	355
	356	#if 0
	357	seq_puts(m, "\nResource bitmap:");
	358
	359	for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
	360	if ((i & 7) == 0)
	361	seq_puts(m,"\n ");
	362	seq_printf(m, "%s %08lx", buf, *res_ptr);
	363	}
	364	#endif
	365	seq_putc(m, '\n');
	366	return 0;
	367	}
	368
	369	static int proc_pcxl_dma_open(struct inode inode, struct file file)
	370	{
	371	return single_open(file, proc_pcxl_dma_show, NULL);
	372	}
	373
	374	static const struct file_operations proc_pcxl_dma_ops = {
	375	.owner = THIS_MODULE,
	376	.open = proc_pcxl_dma_open,
	377	.read = seq_read,
	378	.llseek = seq_lseek,
	379	.release = single_release,
	380	};
	381
1da177e4 LT	382	static int __init
	383	pcxl_dma_init(void)
	384	{
b8db8002 GG	385	if (pcxl_dma_start == 0)
b8db8002 GG	386	return 0;
1da177e4	387
b8db8002 GG	388	spin_lock_init(&pcxl_res_lock);
	389	pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
	390	pcxl_res_hint = 0;
	391	pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
1da177e4	392	get_order(pcxl_res_size));
b8db8002	393	memset(pcxl_res_map, 0, pcxl_res_size);
e51ec241	394	proc_gsc_root = proc_mkdir("gsc", NULL);
b8db8002 GG	395	if (!proc_gsc_root)
	396	printk(KERN_WARNING
	397	"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
	398	else {
	399	struct proc_dir_entry* ent;
27f282b9 AD	400	ent = create_proc_entry("pcxl_dma", 0, proc_gsc_root);
	401	if (ent)
	402	ent->proc_fops = &proc_pcxl_dma_ops;
	403	else
b8db8002 GG	404	printk(KERN_WARNING
	405	"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
	406	}
	407	return 0;
1da177e4 LT	408	}
	409
	410	__initcall(pcxl_dma_init);
	411
5c1fb41f	412	static void * pa11_dma_alloc_consistent (struct device dev, size_t size, dma_addr_t dma_handle, gfp_t flag)
1da177e4 LT	413	{
	414	unsigned long vaddr;
	415	unsigned long paddr;
	416	int order;
	417
	418	order = get_order(size);
	419	size = 1 << (order + PAGE_SHIFT);
	420	vaddr = pcxl_alloc_range(size);
	421	paddr = __get_free_pages(flag, order);
	422	flush_kernel_dcache_range(paddr, size);
	423	paddr = __pa(paddr);
	424	map_uncached_pages(vaddr, size, paddr);
	425	*dma_handle = (dma_addr_t) paddr;
	426
	427	#if 0
	428	/* This probably isn't needed to support EISA cards.
	429	** ISA cards will certainly only support 24-bit DMA addressing.
	430	** Not clear if we can, want, or need to support ISA.
	431	*/
	432	if (!dev \|\| *dev->coherent_dma_mask < 0xffffffff)
	433	gfp \|= GFP_DMA;
	434	#endif
	435	return (void *)vaddr;
	436	}
	437
	438	static void pa11_dma_free_consistent (struct device dev, size_t size, void vaddr, dma_addr_t dma_handle)
	439	{
	440	int order;
	441
	442	order = get_order(size);
	443	size = 1 << (order + PAGE_SHIFT);
	444	unmap_uncached_pages((unsigned long)vaddr, size);
	445	pcxl_free_range((unsigned long)vaddr, size);
	446	free_pages((unsigned long)__va(dma_handle), order);
	447	}
	448
	449	static dma_addr_t pa11_dma_map_single(struct device dev, void addr, size_t size, enum dma_data_direction direction)
	450	{
	451	if (direction == DMA_NONE) {
	452	printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
	453	BUG();
	454	}
	455
	456	flush_kernel_dcache_range((unsigned long) addr, size);
	457	return virt_to_phys(addr);
	458	}
	459
	460	static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
	461	{
	462	if (direction == DMA_NONE) {
	463	printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
	464	BUG();
	465	}
	466
	467	if (direction == DMA_TO_DEVICE)
	468	return;
	469
	470	/*
	471	* For PCI_DMA_FROMDEVICE this flush is not necessary for the
	472	* simple map/unmap case. However, it IS necessary if if
	473	* pci_dma_sync_single_* has been called and the buffer reused.
	474	*/
	475
	476	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
477	return;
478	}
479
480	static int pa11_dma_map_sg(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
481	{
482	int i;
483
484	if (direction == DMA_NONE)
485	BUG();
486
487	for (i = 0; i < nents; i++, sglist++ ) {
488	unsigned long vaddr = sg_virt_addr(sglist);
489	sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
490	sg_dma_len(sglist) = sglist->length;
491	flush_kernel_dcache_range(vaddr, sglist->length);
492	}
493	return nents;
494	}
495
496	static void pa11_dma_unmap_sg(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
497	{
498	int i;
499
500	if (direction == DMA_NONE)
501	BUG();
502
503	if (direction == DMA_TO_DEVICE)
504	return;
505
506	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
507
508	for (i = 0; i < nents; i++, sglist++ )
509	flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
510	return;
511	}
512
513	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)
514	{
515	if (direction == DMA_NONE)
516	BUG();
517
518	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
519	}
520
521	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)
522	{
523	if (direction == DMA_NONE)
524	BUG();
525
526	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
527	}
528
529	static void pa11_dma_sync_sg_for_cpu(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
530	{
531	int i;
532
533	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
534
535	for (i = 0; i < nents; i++, sglist++ )
536	flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
537	}
538
539	static void pa11_dma_sync_sg_for_device(struct device dev, struct scatterlist sglist, int nents, enum dma_data_direction direction)
540	{
541	int i;
542
543	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
544
545	for (i = 0; i < nents; i++, sglist++ )
546	flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
547	}
548
549	struct hppa_dma_ops pcxl_dma_ops = {
550	.dma_supported = pa11_dma_supported,
551	.alloc_consistent = pa11_dma_alloc_consistent,
552	.alloc_noncoherent = pa11_dma_alloc_consistent,
553	.free_consistent = pa11_dma_free_consistent,
554	.map_single = pa11_dma_map_single,
555	.unmap_single = pa11_dma_unmap_single,
556	.map_sg = pa11_dma_map_sg,
557	.unmap_sg = pa11_dma_unmap_sg,
558	.dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
559	.dma_sync_single_for_device = pa11_dma_sync_single_for_device,
560	.dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
561	.dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
562	};
563
564	static void fail_alloc_consistent(struct device dev, size_t size,
5c1fb41f	565	dma_addr_t *dma_handle, gfp_t flag)
1da177e4 LT	566	{
	567	return NULL;
	568	}
	569
	570	static void pa11_dma_alloc_noncoherent(struct device dev, size_t size,
5c1fb41f	571	dma_addr_t *dma_handle, gfp_t flag)
1da177e4	572	{
6f7d998e	573	void *addr;
1da177e4	574
6f7d998e CL	575	addr = (void *)__get_free_pages(flag, get_order(size));
6f7d998e CL	576	if (addr)
1da177e4 LT	577	*dma_handle = (dma_addr_t)virt_to_phys(addr);
	578
	579	return addr;
	580	}
	581
	582	static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
	583	void *vaddr, dma_addr_t iova)
	584	{
6f7d998e	585	free_pages((unsigned long)vaddr, get_order(size));
1da177e4 LT	586	return;
	587	}
	588
	589	struct hppa_dma_ops pcx_dma_ops = {
	590	.dma_supported = pa11_dma_supported,
	591	.alloc_consistent = fail_alloc_consistent,
	592	.alloc_noncoherent = pa11_dma_alloc_noncoherent,
	593	.free_consistent = pa11_dma_free_noncoherent,
	594	.map_single = pa11_dma_map_single,
	595	.unmap_single = pa11_dma_unmap_single,
	596	.map_sg = pa11_dma_map_sg,
	597	.unmap_sg = pa11_dma_unmap_sg,
	598	.dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
	599	.dma_sync_single_for_device = pa11_dma_sync_single_for_device,
	600	.dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
	601	.dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
	602	};