[mirror_ubuntu-artful-kernel.git] / arch / mips / jazz / jazzdma.c

/*
 * Mips Jazz DMA controller support
 * Copyright (C) 1995, 1996 by Andreas Busse
 *
 * NOTE: Some of the argument checking could be removed when
 * things have settled down. Also, instead of returning 0xffffffff
 * on failure of vdma_alloc() one could leave page #0 unused
 * and return the more usual NULL pointer as logical address.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <asm/mipsregs.h>
#include <asm/jazz.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
#include <asm/jazzdma.h>
#include <asm/pgtable.h>

/*
 * Set this to one to enable additional vdma debug code.
 */
#define CONF_DEBUG_VDMA 0

static VDMA_PGTBL_ENTRY *pgtbl;

static DEFINE_SPINLOCK(vdma_lock);

/*
 * Debug stuff
 */
#define vdma_debug     ((CONF_DEBUG_VDMA) ? debuglvl : 0)

static int debuglvl = 3;

/*
 * Initialize the pagetable with a one-to-one mapping of
 * the first 16 Mbytes of main memory and declare all
 * entries to be unused. Using this method will at least
 * allow some early device driver operations to work.
 */
static inline void vdma_pgtbl_init(void)
{
	unsigned long paddr = 0;
	int i;

	for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
		pgtbl[i].frame = paddr;
		pgtbl[i].owner = VDMA_PAGE_EMPTY;
		paddr += VDMA_PAGESIZE;
	}
}

/*
 * Initialize the Jazz R4030 dma controller
 */
static int __init vdma_init(void)
{
	/*
	 * Allocate 32k of memory for DMA page tables.  This needs to be page
	 * aligned and should be uncached to avoid cache flushing after every
	 * update.
	 */
	pgtbl = (VDMA_PGTBL_ENTRY *)__get_free_pages(GFP_KERNEL | GFP_DMA,
						    get_order(VDMA_PGTBL_SIZE));
	BUG_ON(!pgtbl);
	dma_cache_wback_inv((unsigned long)pgtbl, VDMA_PGTBL_SIZE);
	pgtbl = (VDMA_PGTBL_ENTRY *)KSEG1ADDR(pgtbl);

	/*
	 * Clear the R4030 translation table
	 */
	vdma_pgtbl_init();

	r4030_write_reg32(JAZZ_R4030_TRSTBL_BASE, CPHYSADDR(pgtbl));
	r4030_write_reg32(JAZZ_R4030_TRSTBL_LIM, VDMA_PGTBL_SIZE);
	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);

	printk(KERN_INFO "VDMA: R4030 DMA pagetables initialized.\n");
	return 0;
}

/*
 * Allocate DMA pagetables using a simple first-fit algorithm
 */
unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
{
	int first, last, pages, frame, i;
	unsigned long laddr, flags;

	/* check arguments */

	if (paddr > 0x1fffffff) {
		if (vdma_debug)
			printk("vdma_alloc: Invalid physical address: %08lx\n",
			       paddr);
		return VDMA_ERROR;	/* invalid physical address */
	}
	if (size > 0x400000 || size == 0) {
		if (vdma_debug)
			printk("vdma_alloc: Invalid size: %08lx\n", size);
		return VDMA_ERROR;	/* invalid physical address */
	}

	spin_lock_irqsave(&vdma_lock, flags);
	/*
	 * Find free chunk
	 */
	pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1;
	first = 0;
	while (1) {
		while (pgtbl[first].owner != VDMA_PAGE_EMPTY &&
		       first < VDMA_PGTBL_ENTRIES) first++;
		if (first + pages > VDMA_PGTBL_ENTRIES) {	/* nothing free */
			spin_unlock_irqrestore(&vdma_lock, flags);
			return VDMA_ERROR;
		}

		last = first + 1;
		while (pgtbl[last].owner == VDMA_PAGE_EMPTY
		       && last - first < pages)
			last++;

		if (last - first == pages)
			break;	/* found */
		first = last + 1;
	}

	/*
	 * Mark pages as allocated
	 */
	laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
	frame = paddr & ~(VDMA_PAGESIZE - 1);

	for (i = first; i < last; i++) {
		pgtbl[i].frame = frame;
		pgtbl[i].owner = laddr;
		frame += VDMA_PAGESIZE;
	}

	/*
	 * Update translation table and return logical start address
	 */
	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);

	if (vdma_debug > 1)
		printk("vdma_alloc: Allocated %d pages starting from %08lx\n",
		     pages, laddr);

	if (vdma_debug > 2) {
		printk("LADDR: ");
		for (i = first; i < last; i++)
			printk("%08x ", i << 12);
		printk("\nPADDR: ");
		for (i = first; i < last; i++)
			printk("%08x ", pgtbl[i].frame);
		printk("\nOWNER: ");
		for (i = first; i < last; i++)
			printk("%08x ", pgtbl[i].owner);
		printk("\n");
	}

	spin_unlock_irqrestore(&vdma_lock, flags);

	return laddr;
}

EXPORT_SYMBOL(vdma_alloc);

/*
 * Free previously allocated dma translation pages
 * Note that this does NOT change the translation table,
 * it just marks the free'd pages as unused!
 */
int vdma_free(unsigned long laddr)
{
	int i;

	i = laddr >> 12;

	if (pgtbl[i].owner != laddr) {
		printk
		    ("vdma_free: trying to free other's dma pages, laddr=%8lx\n",
		     laddr);
		return -1;
	}

	while (i < VDMA_PGTBL_ENTRIES && pgtbl[i].owner == laddr) {
		pgtbl[i].owner = VDMA_PAGE_EMPTY;
		i++;
	}

	if (vdma_debug > 1)
		printk("vdma_free: freed %ld pages starting from %08lx\n",
		       i - (laddr >> 12), laddr);

	return 0;
}

EXPORT_SYMBOL(vdma_free);

/*
 * Map certain page(s) to another physical address.
 * Caller must have allocated the page(s) before.
 */
int vdma_remap(unsigned long laddr, unsigned long paddr, unsigned long size)
{
	int first, pages, npages;

	if (laddr > 0xffffff) {
		if (vdma_debug)
			printk
			    ("vdma_map: Invalid logical address: %08lx\n",
			     laddr);
		return -EINVAL;	/* invalid logical address */
	}
	if (paddr > 0x1fffffff) {
		if (vdma_debug)
			printk
			    ("vdma_map: Invalid physical address: %08lx\n",
			     paddr);
		return -EINVAL;	/* invalid physical address */
	}

	npages = pages =
	    (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
	first = laddr >> 12;
	if (vdma_debug)
		printk("vdma_remap: first=%x, pages=%x\n", first, pages);
	if (first + pages > VDMA_PGTBL_ENTRIES) {
		if (vdma_debug)
			printk("vdma_alloc: Invalid size: %08lx\n", size);
		return -EINVAL;
	}

	paddr &= ~(VDMA_PAGESIZE - 1);
	while (pages > 0 && first < VDMA_PGTBL_ENTRIES) {
		if (pgtbl[first].owner != laddr) {
			if (vdma_debug)
				printk("Trying to remap other's pages.\n");
			return -EPERM;	/* not owner */
		}
		pgtbl[first].frame = paddr;
		paddr += VDMA_PAGESIZE;
		first++;
		pages--;
	}

	/*
	 * Update translation table
	 */
	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);

	if (vdma_debug > 2) {
		int i;
		pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
		first = laddr >> 12;
		printk("LADDR: ");
		for (i = first; i < first + pages; i++)
			printk("%08x ", i << 12);
		printk("\nPADDR: ");
		for (i = first; i < first + pages; i++)
			printk("%08x ", pgtbl[i].frame);
		printk("\nOWNER: ");
		for (i = first; i < first + pages; i++)
			printk("%08x ", pgtbl[i].owner);
		printk("\n");
	}

	return 0;
}

/*
 * Translate a physical address to a logical address.
 * This will return the logical address of the first
 * match.
 */
unsigned long vdma_phys2log(unsigned long paddr)
{
	int i;
	int frame;

	frame = paddr & ~(VDMA_PAGESIZE - 1);

	for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
		if (pgtbl[i].frame == frame)
			break;
	}

	if (i == VDMA_PGTBL_ENTRIES)
		return ~0UL;

	return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
}

EXPORT_SYMBOL(vdma_phys2log);

/*
 * Translate a logical DMA address to a physical address
 */
unsigned long vdma_log2phys(unsigned long laddr)
{
	return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
}

EXPORT_SYMBOL(vdma_log2phys);

/*
 * Print DMA statistics
 */
void vdma_stats(void)
{
	int i;

	printk("vdma_stats: CONFIG: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_CONFIG));
	printk("R4030 translation table base: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_TRSTBL_BASE));
	printk("R4030 translation table limit: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_TRSTBL_LIM));
	printk("vdma_stats: INV_ADDR: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_INV_ADDR));
	printk("vdma_stats: R_FAIL_ADDR: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_R_FAIL_ADDR));
	printk("vdma_stats: M_FAIL_ADDR: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_M_FAIL_ADDR));
	printk("vdma_stats: IRQ_SOURCE: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_IRQ_SOURCE));
	printk("vdma_stats: I386_ERROR: %08x\n",
	       r4030_read_reg32(JAZZ_R4030_I386_ERROR));
	printk("vdma_chnl_modes:   ");
	for (i = 0; i < 8; i++)
		printk("%04x ",
		       (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
						   (i << 5)));
	printk("\n");
	printk("vdma_chnl_enables: ");
	for (i = 0; i < 8; i++)
		printk("%04x ",
		       (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
						   (i << 5)));
	printk("\n");
}

/*
 * DMA transfer functions
 */

/*
 * Enable a DMA channel. Also clear any error conditions.
 */
void vdma_enable(int channel)
{
	int status;

	if (vdma_debug)
		printk("vdma_enable: channel %d\n", channel);

	/*
	 * Check error conditions first
	 */
	status = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
	if (status & 0x400)
		printk("VDMA: Channel %d: Address error!\n", channel);
	if (status & 0x200)
		printk("VDMA: Channel %d: Memory error!\n", channel);

	/*
	 * Clear all interrupt flags
	 */
	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
			  r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
					   (channel << 5)) | R4030_TC_INTR
			  | R4030_MEM_INTR | R4030_ADDR_INTR);

	/*
	 * Enable the desired channel
	 */
	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
			  r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
					   (channel << 5)) |
			  R4030_CHNL_ENABLE);
}

EXPORT_SYMBOL(vdma_enable);

/*
 * Disable a DMA channel
 */
void vdma_disable(int channel)
{
	if (vdma_debug) {
		int status =
		    r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
				     (channel << 5));

		printk("vdma_disable: channel %d\n", channel);
		printk("VDMA: channel %d status: %04x (%s) mode: "
		       "%02x addr: %06x count: %06x\n",
		       channel, status,
		       ((status & 0x600) ? "ERROR" : "OK"),
		       (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
						   (channel << 5)),
		       (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ADDR +
						   (channel << 5)),
		       (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_COUNT +
						   (channel << 5)));
	}

	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
			  r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
					   (channel << 5)) &
			  ~R4030_CHNL_ENABLE);

	/*
	 * After disabling a DMA channel a remote bus register should be
	 * read to ensure that the current DMA acknowledge cycle is completed.
	 */
	*((volatile unsigned int *) JAZZ_DUMMY_DEVICE);
}

EXPORT_SYMBOL(vdma_disable);

/*
 * Set DMA mode. This function accepts the mode values used
 * to set a PC-style DMA controller. For the SCSI and FDC
 * channels, we also set the default modes each time we're
 * called.
 * NOTE: The FAST and BURST dma modes are supported by the
 * R4030 Rev. 2 and PICA chipsets only. I leave them disabled
 * for now.
 */
void vdma_set_mode(int channel, int mode)
{
	if (vdma_debug)
		printk("vdma_set_mode: channel %d, mode 0x%x\n", channel,
		       mode);

	switch (channel) {
	case JAZZ_SCSI_DMA:	/* scsi */
		r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
/*			  R4030_MODE_FAST | */
/*			  R4030_MODE_BURST | */
				  R4030_MODE_INTR_EN |
				  R4030_MODE_WIDTH_16 |
				  R4030_MODE_ATIME_80);
		break;

	case JAZZ_FLOPPY_DMA:	/* floppy */
		r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
/*			  R4030_MODE_FAST | */
/*			  R4030_MODE_BURST | */
				  R4030_MODE_INTR_EN |
				  R4030_MODE_WIDTH_8 |
				  R4030_MODE_ATIME_120);
		break;

	case JAZZ_AUDIOL_DMA:
	case JAZZ_AUDIOR_DMA:
		printk("VDMA: Audio DMA not supported yet.\n");
		break;

	default:
		printk
		    ("VDMA: vdma_set_mode() called with unsupported channel %d!\n",
		     channel);
	}

	switch (mode) {
	case DMA_MODE_READ:
		r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
				  r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
						   (channel << 5)) &
				  ~R4030_CHNL_WRITE);
		break;

	case DMA_MODE_WRITE:
		r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
				  r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
						   (channel << 5)) |
				  R4030_CHNL_WRITE);
		break;

	default:
		printk
		    ("VDMA: vdma_set_mode() called with unknown dma mode 0x%x\n",
		     mode);
	}
}

EXPORT_SYMBOL(vdma_set_mode);

/*
 * Set Transfer Address
 */
void vdma_set_addr(int channel, long addr)
{
	if (vdma_debug)
		printk("vdma_set_addr: channel %d, addr %lx\n", channel,
		       addr);

	r4030_write_reg32(JAZZ_R4030_CHNL_ADDR + (channel << 5), addr);
}

EXPORT_SYMBOL(vdma_set_addr);

/*
 * Set Transfer Count
 */
void vdma_set_count(int channel, int count)
{
	if (vdma_debug)
		printk("vdma_set_count: channel %d, count %08x\n", channel,
		       (unsigned) count);

	r4030_write_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5), count);
}

EXPORT_SYMBOL(vdma_set_count);

/*
 * Get Residual
 */
int vdma_get_residue(int channel)
{
	int residual;

	residual = r4030_read_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5));

	if (vdma_debug)
		printk("vdma_get_residual: channel %d: residual=%d\n",
		       channel, residual);

	return residual;
}

/*
 * Get DMA channel enable register
 */
int vdma_get_enable(int channel)
{
	int enable;

	enable = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));

	if (vdma_debug)
		printk("vdma_get_enable: channel %d: enable=%d\n", channel,
		       enable);

	return enable;
}

arch_initcall(vdma_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Mips Jazz DMA controller support
	3	* Copyright (C) 1995, 1996 by Andreas Busse
	4	*
	5	* NOTE: Some of the argument checking could be removed when
	6	* things have settled down. Also, instead of returning 0xffffffff
	7	* on failure of vdma_alloc() one could leave page #0 unused
	8	* and return the more usual NULL pointer as logical address.
	9	*/
	10	#include <linux/kernel.h>
	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/errno.h>
	14	#include <linux/mm.h>
	15	#include <linux/bootmem.h>
	16	#include <linux/spinlock.h>
	17	#include <asm/mipsregs.h>
	18	#include <asm/jazz.h>
	19	#include <asm/io.h>
	20	#include <asm/uaccess.h>
	21	#include <asm/dma.h>
	22	#include <asm/jazzdma.h>
	23	#include <asm/pgtable.h>
	24
	25	/*
	26	* Set this to one to enable additional vdma debug code.
	27	*/
	28	#define CONF_DEBUG_VDMA 0
	29
ea202c63	30	static VDMA_PGTBL_ENTRY *pgtbl;
1da177e4 LT	31
	32	static DEFINE_SPINLOCK(vdma_lock);
	33
	34	/*
	35	* Debug stuff
	36	*/
	37	#define vdma_debug ((CONF_DEBUG_VDMA) ? debuglvl : 0)
	38
	39	static int debuglvl = 3;
	40
	41	/*
	42	* Initialize the pagetable with a one-to-one mapping of
	43	* the first 16 Mbytes of main memory and declare all
	44	* entries to be unused. Using this method will at least
	45	* allow some early device driver operations to work.
	46	*/
	47	static inline void vdma_pgtbl_init(void)
	48	{
1da177e4 LT	49	unsigned long paddr = 0;
	50	int i;
	51
	52	for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
	53	pgtbl[i].frame = paddr;
	54	pgtbl[i].owner = VDMA_PAGE_EMPTY;
	55	paddr += VDMA_PAGESIZE;
	56	}
	57	}
	58
	59	/*
	60	* Initialize the Jazz R4030 dma controller
	61	*/
ea202c63	62	static int __init vdma_init(void)
1da177e4 LT	63	{
	64	/*
	65	* Allocate 32k of memory for DMA page tables. This needs to be page
	66	* aligned and should be uncached to avoid cache flushing after every
	67	* update.
	68	*/
ea202c63 TB	69	pgtbl = (VDMA_PGTBL_ENTRY *)__get_free_pages(GFP_KERNEL \| GFP_DMA,
ea202c63 TB	70	get_order(VDMA_PGTBL_SIZE));
b72b7092	71	BUG_ON(!pgtbl);
ea202c63 TB	72	dma_cache_wback_inv((unsigned long)pgtbl, VDMA_PGTBL_SIZE);
ea202c63 TB	73	pgtbl = (VDMA_PGTBL_ENTRY *)KSEG1ADDR(pgtbl);
1da177e4 LT	74
	75	/*
	76	* Clear the R4030 translation table
	77	*/
	78	vdma_pgtbl_init();
	79
ea202c63	80	r4030_write_reg32(JAZZ_R4030_TRSTBL_BASE, CPHYSADDR(pgtbl));
1da177e4 LT	81	r4030_write_reg32(JAZZ_R4030_TRSTBL_LIM, VDMA_PGTBL_SIZE);
	82	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
	83
ea202c63 TB	84	printk(KERN_INFO "VDMA: R4030 DMA pagetables initialized.\n");
ea202c63 TB	85	return 0;
1da177e4 LT	86	}
	87
	88	/*
	89	* Allocate DMA pagetables using a simple first-fit algorithm
	90	*/
	91	unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
	92	{
1da177e4 LT	93	int first, last, pages, frame, i;
	94	unsigned long laddr, flags;
	95
	96	/* check arguments */
	97
	98	if (paddr > 0x1fffffff) {
	99	if (vdma_debug)
	100	printk("vdma_alloc: Invalid physical address: %08lx\n",
	101	paddr);
	102	return VDMA_ERROR; /* invalid physical address */
	103	}
	104	if (size > 0x400000 \|\| size == 0) {
	105	if (vdma_debug)
	106	printk("vdma_alloc: Invalid size: %08lx\n", size);
	107	return VDMA_ERROR; /* invalid physical address */
	108	}
	109
	110	spin_lock_irqsave(&vdma_lock, flags);
	111	/*
	112	* Find free chunk
	113	*/
ea202c63	114	pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1;
1da177e4 LT	115	first = 0;
1da177e4 LT	116	while (1) {
ea202c63	117	while (pgtbl[first].owner != VDMA_PAGE_EMPTY &&
1da177e4 LT	118	first < VDMA_PGTBL_ENTRIES) first++;
	119	if (first + pages > VDMA_PGTBL_ENTRIES) { /* nothing free */
	120	spin_unlock_irqrestore(&vdma_lock, flags);
	121	return VDMA_ERROR;
	122	}
	123
	124	last = first + 1;
ea202c63	125	while (pgtbl[last].owner == VDMA_PAGE_EMPTY
1da177e4 LT	126	&& last - first < pages)
	127	last++;
	128
	129	if (last - first == pages)
	130	break; /* found */
ea202c63	131	first = last + 1;
1da177e4 LT	132	}
	133
	134	/*
	135	* Mark pages as allocated
	136	*/
	137	laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
	138	frame = paddr & ~(VDMA_PAGESIZE - 1);
	139
	140	for (i = first; i < last; i++) {
ea202c63 TB	141	pgtbl[i].frame = frame;
ea202c63 TB	142	pgtbl[i].owner = laddr;
1da177e4 LT	143	frame += VDMA_PAGESIZE;
	144	}
	145
	146	/*
	147	* Update translation table and return logical start address
	148	*/
	149	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
	150
	151	if (vdma_debug > 1)
	152	printk("vdma_alloc: Allocated %d pages starting from %08lx\n",
	153	pages, laddr);
	154
	155	if (vdma_debug > 2) {
	156	printk("LADDR: ");
	157	for (i = first; i < last; i++)
	158	printk("%08x ", i << 12);
	159	printk("\nPADDR: ");
	160	for (i = first; i < last; i++)
ea202c63	161	printk("%08x ", pgtbl[i].frame);
1da177e4 LT	162	printk("\nOWNER: ");
1da177e4 LT	163	for (i = first; i < last; i++)
ea202c63	164	printk("%08x ", pgtbl[i].owner);
1da177e4 LT	165	printk("\n");
	166	}
	167
	168	spin_unlock_irqrestore(&vdma_lock, flags);
	169
	170	return laddr;
	171	}
	172
	173	EXPORT_SYMBOL(vdma_alloc);
	174
	175	/*
	176	* Free previously allocated dma translation pages
	177	* Note that this does NOT change the translation table,
	178	* it just marks the free'd pages as unused!
	179	*/
	180	int vdma_free(unsigned long laddr)
	181	{
1da177e4 LT	182	int i;
	183
	184	i = laddr >> 12;
	185
	186	if (pgtbl[i].owner != laddr) {
	187	printk
	188	("vdma_free: trying to free other's dma pages, laddr=%8lx\n",
	189	laddr);
	190	return -1;
	191	}
	192
3d4656d6	193	while (i < VDMA_PGTBL_ENTRIES && pgtbl[i].owner == laddr) {
1da177e4 LT	194	pgtbl[i].owner = VDMA_PAGE_EMPTY;
	195	i++;
	196	}
	197
	198	if (vdma_debug > 1)
	199	printk("vdma_free: freed %ld pages starting from %08lx\n",
	200	i - (laddr >> 12), laddr);
	201
	202	return 0;
	203	}
	204
	205	EXPORT_SYMBOL(vdma_free);
	206
	207	/*
	208	* Map certain page(s) to another physical address.
	209	* Caller must have allocated the page(s) before.
	210	*/
	211	int vdma_remap(unsigned long laddr, unsigned long paddr, unsigned long size)
	212	{
1da177e4 LT	213	int first, pages, npages;
	214
	215	if (laddr > 0xffffff) {
	216	if (vdma_debug)
	217	printk
	218	("vdma_map: Invalid logical address: %08lx\n",
	219	laddr);
	220	return -EINVAL; /* invalid logical address */
	221	}
	222	if (paddr > 0x1fffffff) {
	223	if (vdma_debug)
	224	printk
	225	("vdma_map: Invalid physical address: %08lx\n",
	226	paddr);
	227	return -EINVAL; /* invalid physical address */
	228	}
	229
	230	npages = pages =
	231	(((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
	232	first = laddr >> 12;
	233	if (vdma_debug)
	234	printk("vdma_remap: first=%x, pages=%x\n", first, pages);
	235	if (first + pages > VDMA_PGTBL_ENTRIES) {
	236	if (vdma_debug)
	237	printk("vdma_alloc: Invalid size: %08lx\n", size);
	238	return -EINVAL;
	239	}
	240
	241	paddr &= ~(VDMA_PAGESIZE - 1);
	242	while (pages > 0 && first < VDMA_PGTBL_ENTRIES) {
	243	if (pgtbl[first].owner != laddr) {
	244	if (vdma_debug)
	245	printk("Trying to remap other's pages.\n");
	246	return -EPERM; /* not owner */
	247	}
	248	pgtbl[first].frame = paddr;
	249	paddr += VDMA_PAGESIZE;
	250	first++;
	251	pages--;
	252	}
	253
	254	/*
	255	* Update translation table
	256	*/
	257	r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
	258
	259	if (vdma_debug > 2) {
	260	int i;
	261	pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
	262	first = laddr >> 12;
	263	printk("LADDR: ");
	264	for (i = first; i < first + pages; i++)
	265	printk("%08x ", i << 12);
	266	printk("\nPADDR: ");
	267	for (i = first; i < first + pages; i++)
	268	printk("%08x ", pgtbl[i].frame);
	269	printk("\nOWNER: ");
	270	for (i = first; i < first + pages; i++)
	271	printk("%08x ", pgtbl[i].owner);
	272	printk("\n");
	273	}
	274
	275	return 0;
	276	}
277
278	/*
279	* Translate a physical address to a logical address.
280	* This will return the logical address of the first
281	* match.
282	*/
283	unsigned long vdma_phys2log(unsigned long paddr)
284	{
285	int i;
286	int frame;
1da177e4 LT	287
	288	frame = paddr & ~(VDMA_PAGESIZE - 1);
	289
	290	for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
	291	if (pgtbl[i].frame == frame)
	292	break;
	293	}
	294
	295	if (i == VDMA_PGTBL_ENTRIES)
	296	return ~0UL;
	297
	298	return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
	299	}
	300
	301	EXPORT_SYMBOL(vdma_phys2log);
	302
	303	/*
	304	* Translate a logical DMA address to a physical address
	305	*/
	306	unsigned long vdma_log2phys(unsigned long laddr)
	307	{
1da177e4 LT	308	return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
	309	}
	310
	311	EXPORT_SYMBOL(vdma_log2phys);
	312
	313	/*
	314	* Print DMA statistics
	315	*/
	316	void vdma_stats(void)
	317	{
	318	int i;
	319
	320	printk("vdma_stats: CONFIG: %08x\n",
	321	r4030_read_reg32(JAZZ_R4030_CONFIG));
	322	printk("R4030 translation table base: %08x\n",
	323	r4030_read_reg32(JAZZ_R4030_TRSTBL_BASE));
	324	printk("R4030 translation table limit: %08x\n",
	325	r4030_read_reg32(JAZZ_R4030_TRSTBL_LIM));
	326	printk("vdma_stats: INV_ADDR: %08x\n",
	327	r4030_read_reg32(JAZZ_R4030_INV_ADDR));
	328	printk("vdma_stats: R_FAIL_ADDR: %08x\n",
	329	r4030_read_reg32(JAZZ_R4030_R_FAIL_ADDR));
	330	printk("vdma_stats: M_FAIL_ADDR: %08x\n",
	331	r4030_read_reg32(JAZZ_R4030_M_FAIL_ADDR));
	332	printk("vdma_stats: IRQ_SOURCE: %08x\n",
	333	r4030_read_reg32(JAZZ_R4030_IRQ_SOURCE));
	334	printk("vdma_stats: I386_ERROR: %08x\n",
	335	r4030_read_reg32(JAZZ_R4030_I386_ERROR));
	336	printk("vdma_chnl_modes: ");
	337	for (i = 0; i < 8; i++)
	338	printk("%04x ",
	339	(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
	340	(i << 5)));
	341	printk("\n");
	342	printk("vdma_chnl_enables: ");
	343	for (i = 0; i < 8; i++)
	344	printk("%04x ",
	345	(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
	346	(i << 5)));
	347	printk("\n");
	348	}
	349
	350	/*
	351	* DMA transfer functions
	352	*/
	353
	354	/*
	355	* Enable a DMA channel. Also clear any error conditions.
	356	*/
	357	void vdma_enable(int channel)
	358	{
	359	int status;
	360
	361	if (vdma_debug)
	362	printk("vdma_enable: channel %d\n", channel);
	363
	364	/*
	365	* Check error conditions first
	366	*/
	367	status = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
	368	if (status & 0x400)
	369	printk("VDMA: Channel %d: Address error!\n", channel);
	370	if (status & 0x200)
	371	printk("VDMA: Channel %d: Memory error!\n", channel);
372
373	/*
374	* Clear all interrupt flags
375	*/
376	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
377	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
378	(channel << 5)) \| R4030_TC_INTR
379	\| R4030_MEM_INTR \| R4030_ADDR_INTR);
380
381	/*
382	* Enable the desired channel
383	*/
384	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
385	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
386	(channel << 5)) \|
387	R4030_CHNL_ENABLE);
388	}
389
390	EXPORT_SYMBOL(vdma_enable);
391
392	/*
393	* Disable a DMA channel
394	*/
395	void vdma_disable(int channel)
396	{
397	if (vdma_debug) {
398	int status =
399	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
400	(channel << 5));
401
402	printk("vdma_disable: channel %d\n", channel);
403	printk("VDMA: channel %d status: %04x (%s) mode: "
404	"%02x addr: %06x count: %06x\n",
405	channel, status,
406	((status & 0x600) ? "ERROR" : "OK"),
407	(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
408	(channel << 5)),
409	(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ADDR +
410	(channel << 5)),
411	(unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_COUNT +
412	(channel << 5)));
413	}
414
415	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
416	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
417	(channel << 5)) &
418	~R4030_CHNL_ENABLE);
419
420	/*
421	* After disabling a DMA channel a remote bus register should be
422	* read to ensure that the current DMA acknowledge cycle is completed.
423	*/
424	((volatile unsigned int ) JAZZ_DUMMY_DEVICE);
425	}
426
427	EXPORT_SYMBOL(vdma_disable);
428
429	/*
430	* Set DMA mode. This function accepts the mode values used
431	* to set a PC-style DMA controller. For the SCSI and FDC
432	* channels, we also set the default modes each time we're
433	* called.
434	* NOTE: The FAST and BURST dma modes are supported by the
435	* R4030 Rev. 2 and PICA chipsets only. I leave them disabled
436	* for now.
437	*/
438	void vdma_set_mode(int channel, int mode)
439	{
440	if (vdma_debug)
441	printk("vdma_set_mode: channel %d, mode 0x%x\n", channel,
442	mode);
443
444	switch (channel) {
445	case JAZZ_SCSI_DMA: /* scsi */
446	r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
447	/* R4030_MODE_FAST \| */
448	/* R4030_MODE_BURST \| */
449	R4030_MODE_INTR_EN \|
450	R4030_MODE_WIDTH_16 \|
451	R4030_MODE_ATIME_80);
452	break;
453
454	case JAZZ_FLOPPY_DMA: /* floppy */
455	r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
456	/* R4030_MODE_FAST \| */
457	/* R4030_MODE_BURST \| */
458	R4030_MODE_INTR_EN \|
459	R4030_MODE_WIDTH_8 \|
460	R4030_MODE_ATIME_120);
461	break;
462
463	case JAZZ_AUDIOL_DMA:
464	case JAZZ_AUDIOR_DMA:
465	printk("VDMA: Audio DMA not supported yet.\n");
466	break;
467
468	default:
469	printk
470	("VDMA: vdma_set_mode() called with unsupported channel %d!\n",
471	channel);
472	}
473
474	switch (mode) {
475	case DMA_MODE_READ:
476	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
477	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
478	(channel << 5)) &
479	~R4030_CHNL_WRITE);
480	break;
481
482	case DMA_MODE_WRITE:
483	r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
484	r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
485	(channel << 5)) \|
486	R4030_CHNL_WRITE);
487	break;
488
489	default:
490	printk
491	("VDMA: vdma_set_mode() called with unknown dma mode 0x%x\n",
492	mode);
493	}
494	}
495
496	EXPORT_SYMBOL(vdma_set_mode);
497
498	/*
499	* Set Transfer Address
500	*/
501	void vdma_set_addr(int channel, long addr)
502	{
503	if (vdma_debug)
504	printk("vdma_set_addr: channel %d, addr %lx\n", channel,
505	addr);
506
507	r4030_write_reg32(JAZZ_R4030_CHNL_ADDR + (channel << 5), addr);
508	}
509
510	EXPORT_SYMBOL(vdma_set_addr);
511
512	/*
513	* Set Transfer Count
514	*/
515	void vdma_set_count(int channel, int count)
516	{
517	if (vdma_debug)
518	printk("vdma_set_count: channel %d, count %08x\n", channel,
519	(unsigned) count);
520
521	r4030_write_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5), count);
522	}
523
524	EXPORT_SYMBOL(vdma_set_count);
525
526	/*
527	* Get Residual
528	*/
529	int vdma_get_residue(int channel)
530	{
531	int residual;
532
533	residual = r4030_read_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5));
534
535	if (vdma_debug)
536	printk("vdma_get_residual: channel %d: residual=%d\n",
537	channel, residual);
538
539	return residual;
540	}
541
542	/*
543	* Get DMA channel enable register
544	*/
545	int vdma_get_enable(int channel)
546	{
547	int enable;
548
549	enable = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
550
551	if (vdma_debug)
552	printk("vdma_get_enable: channel %d: enable=%d\n", channel,
553	enable);
554
555	return enable;
556	}
ea202c63 TB	557
ea202c63 TB	558	arch_initcall(vdma_init);