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
55static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
56static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
57    unsigned long size, char *name);
58static void _sparc_free_io(struct resource *res);
59
60static void register_proc_sparc_ioport(void);
61
62/* This points to the next to use virtual memory for DVMA mappings */
63static 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
80struct xresource {
81	struct resource xres;	/* Must be first */
82	int xflag;		/* 1 == used */
83	char xname[XNMLN+1];
84};
85
86static struct xresource xresv[XNRES];
87
88static 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
103static 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 */
113void __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}
120EXPORT_SYMBOL(ioremap);
121
122/*
123 * Complementary to ioremap().
124 */
125void 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}
146EXPORT_SYMBOL(iounmap);
147
148void __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}
155EXPORT_SYMBOL(of_ioremap);
156
157void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
158{
159	iounmap(base);
160}
161EXPORT_SYMBOL(of_iounmap);
162
163/*
164 * Meat of mapping
165 */
166static 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 */
204static 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 */
227static 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
237unsigned 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
256bool 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
286void sbus_set_sbus64(struct device *dev, int x)
287{
288	printk("sbus_set_sbus64: unsupported\n");
289}
290EXPORT_SYMBOL(sbus_set_sbus64);
291
292static int __init sparc_register_ioport(void)
293{
294	register_proc_sparc_ioport();
295
296	return 0;
297}
298
299arch_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 */
309void 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
320static 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
336static 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}
345