[linux-2.6-block.git] / arch / parisc / kernel / pci-dma.c

// SPDX-License-Identifier: GPL-2.0
/*
** PARISC 1.1 Dynamic DMA mapping support.
** This implementation is for PA-RISC platforms that do not support
** I/O TLBs (aka DMA address translation hardware).
** See Documentation/DMA-API-HOWTO.txt for interface definitions.
**
**      (c) Copyright 1999,2000 Hewlett-Packard Company
**      (c) Copyright 2000 Grant Grundler
**	(c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
**      (c) Copyright 2000 John Marvin
**
** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
** (I assume it's from David Mosberger-Tang but there was no Copyright)
**
** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
**
** - ggg
*/

#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.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 <linux/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 DEFINE_SPINLOCK(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 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 __init
pcxl_dma_init(void)
{
	if (pcxl_dma_start == 0)
		return 0;

	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_single("pcxl_dma", 0, proc_gsc_root,
				proc_pcxl_dma_show);
		if (!ent)
			printk(KERN_WARNING
				"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
	}
	return 0;
}

__initcall(pcxl_dma_init);

void *arch_dma_alloc(struct device *dev, size_t size,
		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
	unsigned long vaddr;
	unsigned long paddr;
	int order;

	if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
		return NULL;

	order = get_order(size);
	size = 1 << (order + PAGE_SHIFT);
	vaddr = pcxl_alloc_range(size);
	paddr = __get_free_pages(gfp | __GFP_ZERO, 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;
}

void arch_dma_free(struct device *dev, size_t size, void *vaddr,
		dma_addr_t dma_handle, unsigned long attrs)
{
	int order = get_order(size);

	WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 &&
		     boot_cpu_data.cpu_type != pcxl);

	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);
}

void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
		size_t size, enum dma_data_direction dir)
{
	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
}

void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
		size_t size, enum dma_data_direction dir)
{
	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
}

void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	       enum dma_data_direction direction)
{
	flush_kernel_dcache_range((unsigned long)vaddr, size);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	** PARISC 1.1 Dynamic DMA mapping support.
	4	** This implementation is for PA-RISC platforms that do not support
	5	** I/O TLBs (aka DMA address translation hardware).
395cf969	6	** See Documentation/DMA-API-HOWTO.txt for interface definitions.
1da177e4 LT	7	**
	8	** (c) Copyright 1999,2000 Hewlett-Packard Company
	9	** (c) Copyright 2000 Grant Grundler
	10	** (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
	11	** (c) Copyright 2000 John Marvin
	12	**
	13	** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
	14	** (I assume it's from David Mosberger-Tang but there was no Copyright)
	15	**
	16	** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
	17	**
	18	** - ggg
	19	*/
	20
	21	#include <linux/init.h>
5a0e3ad6	22	#include <linux/gfp.h>
1da177e4	23	#include <linux/mm.h>
1da177e4	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>
c1f59375 CH	28	#include <linux/dma-direct.h>
c1f59375 CH	29	#include <linux/dma-noncoherent.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>
7c0f6ba6	36	#include <linux/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
1da177e4 LT	43	extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
8b5bdd85	44	static DEFINE_SPINLOCK(pcxl_res_lock);
1da177e4 LT	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
1da177e4 LT	77	static inline int map_pte_uncached(pte_t * pte,
	78	unsigned long vaddr,
	79	unsigned long size, unsigned long *paddr_ptr)
	80	{
	81	unsigned long end;
	82	unsigned long orig_vaddr = vaddr;
	83
	84	vaddr &= ~PMD_MASK;
	85	end = vaddr + size;
	86	if (end > PMD_SIZE)
	87	end = PMD_SIZE;
	88	do {
e82a3b75 HD	89	unsigned long flags;
e82a3b75 HD	90
1da177e4 LT	91	if (!pte_none(*pte))
1da177e4 LT	92	printk(KERN_ERR "map_pte_uncached: page already exists\n");
e82a3b75	93	purge_tlb_start(flags);
c0452fb9	94	set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
1da177e4	95	pdtlb_kernel(orig_vaddr);
e82a3b75	96	purge_tlb_end(flags);
1da177e4 LT	97	vaddr += PAGE_SIZE;
	98	orig_vaddr += PAGE_SIZE;
	99	(*paddr_ptr) += PAGE_SIZE;
	100	pte++;
	101	} while (vaddr < end);
	102	return 0;
	103	}
	104
	105	static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
	106	unsigned long size, unsigned long *paddr_ptr)
	107	{
	108	unsigned long end;
	109	unsigned long orig_vaddr = vaddr;
	110
	111	vaddr &= ~PGDIR_MASK;
	112	end = vaddr + size;
	113	if (end > PGDIR_SIZE)
	114	end = PGDIR_SIZE;
	115	do {
872fec16	116	pte_t * pte = pte_alloc_kernel(pmd, vaddr);
1da177e4 LT	117	if (!pte)
	118	return -ENOMEM;
	119	if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
	120	return -ENOMEM;
	121	vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
	122	orig_vaddr += PMD_SIZE;
	123	pmd++;
	124	} while (vaddr < end);
	125	return 0;
	126	}
	127
	128	static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
	129	unsigned long paddr)
	130	{
	131	pgd_t * dir;
	132	unsigned long end = vaddr + size;
	133
	134	dir = pgd_offset_k(vaddr);
	135	do {
	136	pmd_t *pmd;
	137
	138	pmd = pmd_alloc(NULL, dir, vaddr);
	139	if (!pmd)
	140	return -ENOMEM;
	141	if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
	142	return -ENOMEM;
	143	vaddr = vaddr + PGDIR_SIZE;
	144	dir++;
	145	} while (vaddr && (vaddr < end));
	146	return 0;
	147	}
	148
	149	static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
	150	unsigned long size)
	151	{
	152	pte_t * pte;
	153	unsigned long end;
	154	unsigned long orig_vaddr = vaddr;
	155
	156	if (pmd_none(*pmd))
	157	return;
	158	if (pmd_bad(*pmd)) {
	159	pmd_ERROR(*pmd);
	160	pmd_clear(pmd);
	161	return;
	162	}
	163	pte = pte_offset_map(pmd, vaddr);
	164	vaddr &= ~PMD_MASK;
	165	end = vaddr + size;
	166	if (end > PMD_SIZE)
	167	end = PMD_SIZE;
	168	do {
e82a3b75	169	unsigned long flags;
1da177e4	170	pte_t page = *pte;
e82a3b75	171
1da177e4	172	pte_clear(&init_mm, vaddr, pte);
e82a3b75	173	purge_tlb_start(flags);
1da177e4	174	pdtlb_kernel(orig_vaddr);
e82a3b75	175	purge_tlb_end(flags);
1da177e4 LT	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
1da177e4 LT	369	static int __init
	370	pcxl_dma_init(void)
	371	{
b8db8002 GG	372	if (pcxl_dma_start == 0)
b8db8002 GG	373	return 0;
1da177e4	374
b8db8002 GG	375	pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
	376	pcxl_res_hint = 0;
	377	pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
1da177e4	378	get_order(pcxl_res_size));
b8db8002	379	memset(pcxl_res_map, 0, pcxl_res_size);
e51ec241	380	proc_gsc_root = proc_mkdir("gsc", NULL);
b8db8002 GG	381	if (!proc_gsc_root)
	382	printk(KERN_WARNING
	383	"pcxl_dma_init: Unable to create gsc /proc dir entry\n");
	384	else {
	385	struct proc_dir_entry* ent;
3f3942ac CH	386	ent = proc_create_single("pcxl_dma", 0, proc_gsc_root,
3f3942ac CH	387	proc_pcxl_dma_show);
6f1c86ec	388	if (!ent)
b8db8002 GG	389	printk(KERN_WARNING
	390	"pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
	391	}
	392	return 0;
1da177e4 LT	393	}
	394
	395	__initcall(pcxl_dma_init);
	396
c2f2124e CH	397	void arch_dma_alloc(struct device dev, size_t size,
c2f2124e CH	398	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
1da177e4 LT	399	{
	400	unsigned long vaddr;
	401	unsigned long paddr;
	402	int order;
	403
c2f2124e CH	404	if (boot_cpu_data.cpu_type != pcxl2 && boot_cpu_data.cpu_type != pcxl)
	405	return NULL;
	406
1da177e4 LT	407	order = get_order(size);
	408	size = 1 << (order + PAGE_SHIFT);
	409	vaddr = pcxl_alloc_range(size);
c2f2124e	410	paddr = __get_free_pages(gfp \| __GFP_ZERO, order);
1da177e4 LT	411	flush_kernel_dcache_range(paddr, size);
	412	paddr = __pa(paddr);
	413	map_uncached_pages(vaddr, size, paddr);
	414	*dma_handle = (dma_addr_t) paddr;
	415
	416	#if 0
	417	/* This probably isn't needed to support EISA cards.
	418	** ISA cards will certainly only support 24-bit DMA addressing.
	419	** Not clear if we can, want, or need to support ISA.
	420	*/
	421	if (!dev \|\| *dev->coherent_dma_mask < 0xffffffff)
	422	gfp \|= GFP_DMA;
	423	#endif
	424	return (void *)vaddr;
	425	}
	426
c1f59375	427	void arch_dma_free(struct device dev, size_t size, void vaddr,
00085f1e	428	dma_addr_t dma_handle, unsigned long attrs)
1da177e4	429	{
a34a9b96	430	int order = get_order(size);
1da177e4	431
c2f2124e CH	432	WARN_ON_ONCE(boot_cpu_data.cpu_type != pcxl2 &&
c2f2124e CH	433	boot_cpu_data.cpu_type != pcxl);
a34a9b96	434
c2f2124e CH	435	size = 1 << (order + PAGE_SHIFT);
	436	unmap_uncached_pages((unsigned long)vaddr, size);
	437	pcxl_free_range((unsigned long)vaddr, size);
	438
	439	free_pages((unsigned long)__va(dma_handle), order);
1da177e4 LT	440	}
1da177e4 LT	441
c1f59375 CH	442	void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
c1f59375 CH	443	size_t size, enum dma_data_direction dir)
1da177e4	444	{
c1f59375	445	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
1da177e4 LT	446	}
1da177e4 LT	447
c1f59375 CH	448	void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
c1f59375 CH	449	size_t size, enum dma_data_direction dir)
1da177e4	450	{
c1f59375	451	flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size);
1da177e4 LT	452	}
1da177e4 LT	453
c1f59375	454	void arch_dma_cache_sync(struct device dev, void vaddr, size_t size,
c9eb6172 CH	455	enum dma_data_direction direction)
	456	{
	457	flush_kernel_dcache_range((unsigned long)vaddr, size);
	458	}