[linux-2.6-block.git] / arch / sparc / kernel / ioport.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ioport.c:  Simple io mapping allocator.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *
 * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
 *
 * 2000/01/29
 * <rth> zait: as long as pci_alloc_consistent produces something addressable, 
 *	things are ok.
 * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
 *	pointer into the big page mapping
 * <rth> zait: so what?
 * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
 * <zaitcev> Hmm
 * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
 *	So far so good.
 * <zaitcev> Now, driver calls pci_free_consistent(with result of
 *	remap_it_my_way()).
 * <zaitcev> How do you find the address to pass to free_pages()?
 * <rth> zait: walk the page tables?  It's only two or three level after all.
 * <rth> zait: you have to walk them anyway to remove the mapping.
 * <zaitcev> Hmm
 * <zaitcev> Sounds reasonable
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/pci.h>		/* struct pci_dev */
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>
#include <linux/dma-map-ops.h>
#include <linux/of.h>

#include <asm/io.h>
#include <asm/vaddrs.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/io-unit.h>
#include <asm/leon.h>

static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
    unsigned long size, char *name);
static void _sparc_free_io(struct resource *res);

static void register_proc_sparc_ioport(void);

/* This points to the next to use virtual memory for DVMA mappings */
static struct resource _sparc_dvma = {
	.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
};
/* This points to the start of I/O mappings, cluable from outside. */
/*ext*/ struct resource sparc_iomap = {
	.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
};

/*
 * Our mini-allocator...
 * Boy this is gross! We need it because we must map I/O for
 * timers and interrupt controller before the kmalloc is available.
 */

#define XNMLN  15
#define XNRES  10	/* SS-10 uses 8 */

struct xresource {
	struct resource xres;	/* Must be first */
	int xflag;		/* 1 == used */
	char xname[XNMLN+1];
};

static struct xresource xresv[XNRES];

static struct xresource *xres_alloc(void) {
	struct xresource *xrp;
	int n;

	xrp = xresv;
	for (n = 0; n < XNRES; n++) {
		if (xrp->xflag == 0) {
			xrp->xflag = 1;
			return xrp;
		}
		xrp++;
	}
	return NULL;
}

static void xres_free(struct xresource *xrp) {
	xrp->xflag = 0;
}

/*
 * These are typically used in PCI drivers
 * which are trying to be cross-platform.
 *
 * Bus type is always zero on IIep.
 */
void __iomem *ioremap(phys_addr_t offset, size_t size)
{
	char name[14];

	sprintf(name, "phys_%08x", (u32)offset);
	return _sparc_alloc_io(0, (unsigned long)offset, size, name);
}
EXPORT_SYMBOL(ioremap);

/*
 * Complementary to ioremap().
 */
void iounmap(volatile void __iomem *virtual)
{
	unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
	struct resource *res;

	/*
	 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
	 * This probably warrants some sort of hashing.
	*/
	if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
		printk("free_io/iounmap: cannot free %lx\n", vaddr);
		return;
	}
	_sparc_free_io(res);

	if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
		xres_free((struct xresource *)res);
	} else {
		kfree(res);
	}
}
EXPORT_SYMBOL(iounmap);

void __iomem *of_ioremap(struct resource *res, unsigned long offset,
			 unsigned long size, char *name)
{
	return _sparc_alloc_io(res->flags & 0xF,
			       res->start + offset,
			       size, name);
}
EXPORT_SYMBOL(of_ioremap);

void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
	iounmap(base);
}
EXPORT_SYMBOL(of_iounmap);

/*
 * Meat of mapping
 */
static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
    unsigned long size, char *name)
{
	static int printed_full;
	struct xresource *xres;
	struct resource *res;
	char *tack;
	int tlen;
	void __iomem *va;	/* P3 diag */

	if (name == NULL) name = "???";

	if ((xres = xres_alloc()) != NULL) {
		tack = xres->xname;
		res = &xres->xres;
	} else {
		if (!printed_full) {
			printk("ioremap: done with statics, switching to malloc\n");
			printed_full = 1;
		}
		tlen = strlen(name);
		tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
		if (tack == NULL) return NULL;
		memset(tack, 0, sizeof(struct resource));
		res = (struct resource *) tack;
		tack += sizeof (struct resource);
	}

	strscpy(tack, name, XNMLN+1);
	res->name = tack;

	va = _sparc_ioremap(res, busno, phys, size);
	/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
	return va;
}

/*
 */
static void __iomem *
_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
{
	unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);

	if (allocate_resource(&sparc_iomap, res,
	    (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
	    sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
		/* Usually we cannot see printks in this case. */
		prom_printf("alloc_io_res(%s): cannot occupy\n",
		    (res->name != NULL)? res->name: "???");
		prom_halt();
	}

	pa &= PAGE_MASK;
	srmmu_mapiorange(bus, pa, res->start, resource_size(res));

	return (void __iomem *)(unsigned long)(res->start + offset);
}

/*
 * Complementary to _sparc_ioremap().
 */
static void _sparc_free_io(struct resource *res)
{
	unsigned long plen;

	plen = resource_size(res);
	BUG_ON((plen & (PAGE_SIZE-1)) != 0);
	srmmu_unmapiorange(res->start, plen);
	release_resource(res);
}

unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
{
	struct resource *res;

	res = kzalloc(sizeof(*res), GFP_KERNEL);
	if (!res)
		return 0;
	res->name = dev->of_node->full_name;

	if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
			      _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
		printk("%s: cannot occupy 0x%zx", __func__, len);
		kfree(res);
		return 0;
	}

	return res->start;
}

bool sparc_dma_free_resource(void *cpu_addr, size_t size)
{
	unsigned long addr = (unsigned long)cpu_addr;
	struct resource *res;

	res = lookup_resource(&_sparc_dvma, addr);
	if (!res) {
		printk("%s: cannot free %p\n", __func__, cpu_addr);
		return false;
	}

	if ((addr & (PAGE_SIZE - 1)) != 0) {
		printk("%s: unaligned va %p\n", __func__, cpu_addr);
		return false;
	}

	size = PAGE_ALIGN(size);
	if (resource_size(res) != size) {
		printk("%s: region 0x%lx asked 0x%zx\n",
			__func__, (long)resource_size(res), size);
		return false;
	}

	release_resource(res);
	kfree(res);
	return true;
}

#ifdef CONFIG_SBUS

void sbus_set_sbus64(struct device *dev, int x)
{
	printk("sbus_set_sbus64: unsupported\n");
}
EXPORT_SYMBOL(sbus_set_sbus64);

static int __init sparc_register_ioport(void)
{
	register_proc_sparc_ioport();

	return 0;
}

arch_initcall(sparc_register_ioport);

#endif /* CONFIG_SBUS */

/*
 * IIep is write-through, not flushing on cpu to device transfer.
 *
 * On LEON systems without cache snooping, the entire D-CACHE must be flushed to
 * make DMA to cacheable memory coherent.
 */
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
		enum dma_data_direction dir)
{
	if (dir != DMA_TO_DEVICE &&
	    sparc_cpu_model == sparc_leon &&
	    !sparc_leon3_snooping_enabled())
		leon_flush_dcache_all();
}

#ifdef CONFIG_PROC_FS

static int sparc_io_proc_show(struct seq_file *m, void *v)
{
	struct resource *root = m->private, *r;
	const char *nm;

	for (r = root->child; r != NULL; r = r->sibling) {
		if ((nm = r->name) == NULL) nm = "???";
		seq_printf(m, "%016llx-%016llx: %s\n",
				(unsigned long long)r->start,
				(unsigned long long)r->end, nm);
	}

	return 0;
}
#endif /* CONFIG_PROC_FS */

static void register_proc_sparc_ioport(void)
{
#ifdef CONFIG_PROC_FS
	proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
			&sparc_iomap);
	proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
			&_sparc_dvma);
#endif
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* ioport.c: Simple io mapping allocator.
	4	*
	5	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	6	* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
	7	*
	8	* 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
	9	*
	10	* 2000/01/29
	11	* <rth> zait: as long as pci_alloc_consistent produces something addressable,
	12	* things are ok.
	13	* <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
	14	* pointer into the big page mapping
	15	* <rth> zait: so what?
	16	* <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
	17	* <zaitcev> Hmm
	18	* <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
	19	* So far so good.
	20	* <zaitcev> Now, driver calls pci_free_consistent(with result of
	21	* remap_it_my_way()).
	22	* <zaitcev> How do you find the address to pass to free_pages()?
	23	* <rth> zait: walk the page tables? It's only two or three level after all.
	24	* <rth> zait: you have to walk them anyway to remove the mapping.
	25	* <zaitcev> Hmm
	26	* <zaitcev> Sounds reasonable
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/sched.h>
	31	#include <linux/kernel.h>
	32	#include <linux/errno.h>
	33	#include <linux/types.h>
	34	#include <linux/ioport.h>
	35	#include <linux/mm.h>
	36	#include <linux/slab.h>
	37	#include <linux/pci.h> /* struct pci_dev */
	38	#include <linux/proc_fs.h>
	39	#include <linux/seq_file.h>
	40	#include <linux/scatterlist.h>
	41	#include <linux/dma-map-ops.h>
	42	#include <linux/of.h>
	43
	44	#include <asm/io.h>
	45	#include <asm/vaddrs.h>
	46	#include <asm/oplib.h>
	47	#include <asm/prom.h>
	48	#include <asm/page.h>
	49	#include <asm/pgalloc.h>
	50	#include <asm/dma.h>
	51	#include <asm/iommu.h>
	52	#include <asm/io-unit.h>
	53	#include <asm/leon.h>
	54
	55	static void __iomem _sparc_ioremap(struct resource res, u32 bus, u32 pa, int sz);
	56	static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
	57	unsigned long size, char *name);
	58	static void _sparc_free_io(struct resource *res);
	59
	60	static void register_proc_sparc_ioport(void);
	61
	62	/* This points to the next to use virtual memory for DVMA mappings */
	63	static struct resource _sparc_dvma = {
	64	.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
	65	};
	66	/* This points to the start of I/O mappings, cluable from outside. */
	67	/ext/ struct resource sparc_iomap = {
	68	.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
	69	};
	70
	71	/*
	72	* Our mini-allocator...
	73	* Boy this is gross! We need it because we must map I/O for
	74	* timers and interrupt controller before the kmalloc is available.
	75	*/
	76
	77	#define XNMLN 15
	78	#define XNRES 10 /* SS-10 uses 8 */
	79
	80	struct xresource {
	81	struct resource xres; /* Must be first */
	82	int xflag; /* 1 == used */
	83	char xname[XNMLN+1];
	84	};
	85
	86	static struct xresource xresv[XNRES];
	87
	88	static struct xresource *xres_alloc(void) {
	89	struct xresource *xrp;
	90	int n;
	91
	92	xrp = xresv;
	93	for (n = 0; n < XNRES; n++) {
	94	if (xrp->xflag == 0) {
	95	xrp->xflag = 1;
	96	return xrp;
	97	}
	98	xrp++;
	99	}
	100	return NULL;
	101	}
	102
	103	static void xres_free(struct xresource *xrp) {
	104	xrp->xflag = 0;
	105	}
	106
	107	/*
	108	* These are typically used in PCI drivers
	109	* which are trying to be cross-platform.
	110	*
	111	* Bus type is always zero on IIep.
	112	*/
	113	void __iomem *ioremap(phys_addr_t offset, size_t size)
	114	{
	115	char name[14];
	116
	117	sprintf(name, "phys_%08x", (u32)offset);
	118	return _sparc_alloc_io(0, (unsigned long)offset, size, name);
	119	}
	120	EXPORT_SYMBOL(ioremap);
	121
	122	/*
	123	* Complementary to ioremap().
	124	*/
	125	void iounmap(volatile void __iomem *virtual)
	126	{
	127	unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
	128	struct resource *res;
	129
	130	/*
	131	* XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
	132	* This probably warrants some sort of hashing.
	133	*/
	134	if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
	135	printk("free_io/iounmap: cannot free %lx\n", vaddr);
	136	return;
	137	}
	138	_sparc_free_io(res);
	139
	140	if ((char )res >= (char)xresv && (char )res < (char )&xresv[XNRES]) {
	141	xres_free((struct xresource *)res);
	142	} else {
	143	kfree(res);
	144	}
	145	}
	146	EXPORT_SYMBOL(iounmap);
	147
	148	void __iomem of_ioremap(struct resource res, unsigned long offset,
	149	unsigned long size, char *name)
	150	{
	151	return _sparc_alloc_io(res->flags & 0xF,
	152	res->start + offset,
	153	size, name);
	154	}
	155	EXPORT_SYMBOL(of_ioremap);
	156
	157	void of_iounmap(struct resource res, void __iomem base, unsigned long size)
	158	{
	159	iounmap(base);
	160	}
	161	EXPORT_SYMBOL(of_iounmap);
	162
	163	/*
	164	* Meat of mapping
	165	*/
	166	static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
	167	unsigned long size, char *name)
	168	{
	169	static int printed_full;
	170	struct xresource *xres;
	171	struct resource *res;
	172	char *tack;
	173	int tlen;
	174	void __iomem va; / P3 diag */
	175
	176	if (name == NULL) name = "???";
	177
	178	if ((xres = xres_alloc()) != NULL) {
	179	tack = xres->xname;
	180	res = &xres->xres;
	181	} else {
	182	if (!printed_full) {
	183	printk("ioremap: done with statics, switching to malloc\n");
	184	printed_full = 1;
	185	}
	186	tlen = strlen(name);
	187	tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
	188	if (tack == NULL) return NULL;
	189	memset(tack, 0, sizeof(struct resource));
	190	res = (struct resource *) tack;
	191	tack += sizeof (struct resource);
	192	}
	193
	194	strscpy(tack, name, XNMLN+1);
	195	res->name = tack;
	196
	197	va = _sparc_ioremap(res, busno, phys, size);
	198	/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); / / P3 diag */
	199	return va;
	200	}
	201
	202	/*
	203	*/
	204	static void __iomem *
	205	_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
	206	{
	207	unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
	208
	209	if (allocate_resource(&sparc_iomap, res,
	210	(offset + sz + PAGE_SIZE-1) & PAGE_MASK,
	211	sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
	212	/* Usually we cannot see printks in this case. */
	213	prom_printf("alloc_io_res(%s): cannot occupy\n",
	214	(res->name != NULL)? res->name: "???");
	215	prom_halt();
	216	}
	217
	218	pa &= PAGE_MASK;
	219	srmmu_mapiorange(bus, pa, res->start, resource_size(res));
	220
	221	return (void __iomem *)(unsigned long)(res->start + offset);
	222	}
	223
	224	/*
	225	* Complementary to _sparc_ioremap().
	226	*/
	227	static void _sparc_free_io(struct resource *res)
	228	{
	229	unsigned long plen;
	230
	231	plen = resource_size(res);
	232	BUG_ON((plen & (PAGE_SIZE-1)) != 0);
	233	srmmu_unmapiorange(res->start, plen);
	234	release_resource(res);
	235	}
	236
	237	unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
	238	{
	239	struct resource *res;
	240
	241	res = kzalloc(sizeof(*res), GFP_KERNEL);
	242	if (!res)
	243	return 0;
	244	res->name = dev->of_node->full_name;
	245
	246	if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
	247	_sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
	248	printk("%s: cannot occupy 0x%zx", __func__, len);
	249	kfree(res);
	250	return 0;
	251	}
	252
	253	return res->start;
	254	}
	255
	256	bool sparc_dma_free_resource(void *cpu_addr, size_t size)
	257	{
	258	unsigned long addr = (unsigned long)cpu_addr;
	259	struct resource *res;
	260
	261	res = lookup_resource(&_sparc_dvma, addr);
	262	if (!res) {
	263	printk("%s: cannot free %p\n", __func__, cpu_addr);
	264	return false;
	265	}
	266
	267	if ((addr & (PAGE_SIZE - 1)) != 0) {
	268	printk("%s: unaligned va %p\n", __func__, cpu_addr);
	269	return false;
	270	}
	271
	272	size = PAGE_ALIGN(size);
	273	if (resource_size(res) != size) {
	274	printk("%s: region 0x%lx asked 0x%zx\n",
	275	__func__, (long)resource_size(res), size);
	276	return false;
	277	}
	278
	279	release_resource(res);
	280	kfree(res);
	281	return true;
	282	}
	283
	284	#ifdef CONFIG_SBUS
	285
	286	void sbus_set_sbus64(struct device *dev, int x)
	287	{
	288	printk("sbus_set_sbus64: unsupported\n");
	289	}
	290	EXPORT_SYMBOL(sbus_set_sbus64);
	291
	292	static int __init sparc_register_ioport(void)
	293	{
	294	register_proc_sparc_ioport();
	295
	296	return 0;
	297	}
	298
	299	arch_initcall(sparc_register_ioport);
	300
	301	#endif /* CONFIG_SBUS */
	302
	303	/*
	304	* IIep is write-through, not flushing on cpu to device transfer.
	305	*
	306	* On LEON systems without cache snooping, the entire D-CACHE must be flushed to
	307	* make DMA to cacheable memory coherent.
	308	*/
	309	void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
	310	enum dma_data_direction dir)
	311	{
	312	if (dir != DMA_TO_DEVICE &&
	313	sparc_cpu_model == sparc_leon &&
	314	!sparc_leon3_snooping_enabled())
	315	leon_flush_dcache_all();
	316	}
	317
	318	#ifdef CONFIG_PROC_FS
	319
	320	static int sparc_io_proc_show(struct seq_file m, void v)
	321	{
	322	struct resource root = m->private, r;
	323	const char *nm;
	324
	325	for (r = root->child; r != NULL; r = r->sibling) {
	326	if ((nm = r->name) == NULL) nm = "???";
	327	seq_printf(m, "%016llx-%016llx: %s\n",
	328	(unsigned long long)r->start,
	329	(unsigned long long)r->end, nm);
	330	}
	331
	332	return 0;
	333	}
	334	#endif /* CONFIG_PROC_FS */
	335
	336	static void register_proc_sparc_ioport(void)
	337	{
	338	#ifdef CONFIG_PROC_FS
	339	proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
	340	&sparc_iomap);
	341	proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
	342	&_sparc_dvma);
	343	#endif
	344	}