blob: d8376f61b4d080180a4993c3a92a52bc7ab99283 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Adrian Bunk88278ca2008-05-19 16:53:02 -07002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * io-unit.c: IO-UNIT specific routines for memory management.
4 *
5 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/bitops.h>
Christoph Hellwig0a0f0d82020-09-22 15:31:03 +020014#include <linux/dma-map-ops.h>
David S. Miller9dc69232008-08-27 19:54:01 -070015#include <linux/of.h>
Rob Herring263291f2023-07-18 14:45:20 -060016#include <linux/of_platform.h>
17#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/io.h>
20#include <asm/io-unit.h>
21#include <asm/mxcc.h>
22#include <asm/cacheflush.h>
23#include <asm/tlbflush.h>
24#include <asm/dma.h>
David S. Millerd4accd62006-11-30 17:11:26 -080025#include <asm/oplib.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Sam Ravnborg19186602014-05-16 23:25:41 +020027#include "mm_32.h"
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/* #define IOUNIT_DEBUG */
30#ifdef IOUNIT_DEBUG
31#define IOD(x) printk(x)
32#else
33#define IOD(x) do { } while (0)
34#endif
35
36#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
37#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
38
Christoph Hellwig255a69a2020-03-23 09:43:42 +010039static const struct dma_map_ops iounit_dma_ops;
40
Grant Likelycd4cd732010-07-22 16:04:30 -060041static void __init iounit_iommu_init(struct platform_device *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct iounit_struct *iounit;
Sam Ravnborg19186602014-05-16 23:25:41 +020044 iopte_t __iomem *xpt;
45 iopte_t __iomem *xptend;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Yan Burmanc80892d2006-11-30 17:07:04 -080047 iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
David S. Millerd4accd62006-11-30 17:11:26 -080048 if (!iounit) {
49 prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
50 prom_halt();
51 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 iounit->limit[0] = IOUNIT_BMAP1_START;
54 iounit->limit[1] = IOUNIT_BMAP2_START;
55 iounit->limit[2] = IOUNIT_BMAPM_START;
56 iounit->limit[3] = IOUNIT_BMAPM_END;
57 iounit->rotor[1] = IOUNIT_BMAP2_START;
58 iounit->rotor[2] = IOUNIT_BMAPM_START;
59
David S. Millere0039342008-08-25 22:47:20 -070060 xpt = of_ioremap(&op->resource[2], 0, PAGE_SIZE * 16, "XPT");
61 if (!xpt) {
62 prom_printf("SUN4D: Cannot map External Page Table.");
63 prom_halt();
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
David S. Millere0039342008-08-25 22:47:20 -070066 op->dev.archdata.iommu = iounit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 iounit->page_table = xpt;
Raymond Burns2f72ba42006-07-17 21:40:27 -070068 spin_lock_init(&iounit->lock);
Sam Ravnborg19186602014-05-16 23:25:41 +020069
70 xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
71 for (; xpt < xptend; xpt++)
72 sbus_writel(0, xpt);
Christoph Hellwig255a69a2020-03-23 09:43:42 +010073
74 op->dev.dma_ops = &iounit_dma_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
David S. Miller046e26a2008-08-27 04:54:04 -070077static int __init iounit_init(void)
78{
79 extern void sun4d_init_sbi_irq(void);
80 struct device_node *dp;
81
82 for_each_node_by_name(dp, "sbi") {
Grant Likelycd4cd732010-07-22 16:04:30 -060083 struct platform_device *op = of_find_device_by_node(dp);
David S. Miller046e26a2008-08-27 04:54:04 -070084
85 iounit_iommu_init(op);
86 of_propagate_archdata(op);
87 }
88
89 sun4d_init_sbi_irq();
90
91 return 0;
92}
93
94subsys_initcall(iounit_init);
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* One has to hold iounit->lock to call this */
97static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
98{
99 int i, j, k, npages;
100 unsigned long rotor, scan, limit;
101 iopte_t iopte;
102
103 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
104
105 /* A tiny bit of magic ingredience :) */
106 switch (npages) {
107 case 1: i = 0x0231; break;
108 case 2: i = 0x0132; break;
109 default: i = 0x0213; break;
110 }
111
112 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
113
114next: j = (i & 15);
115 rotor = iounit->rotor[j - 1];
116 limit = iounit->limit[j];
117 scan = rotor;
118nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
119 if (scan + npages > limit) {
120 if (limit != rotor) {
121 limit = rotor;
122 scan = iounit->limit[j - 1];
123 goto nexti;
124 }
125 i >>= 4;
126 if (!(i & 15))
127 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
128 goto next;
129 }
130 for (k = 1, scan++; k < npages; k++)
131 if (test_bit(scan++, iounit->bmap))
132 goto nexti;
133 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
134 scan -= npages;
135 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
136 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
137 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
138 set_bit(scan, iounit->bmap);
Sam Ravnborg6e6e4182016-04-22 19:41:06 +0200139 sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
141 IOD(("%08lx\n", vaddr));
142 return vaddr;
143}
144
Christoph Hellwigce65d362018-12-03 14:04:32 +0100145static dma_addr_t iounit_map_page(struct device *dev, struct page *page,
146 unsigned long offset, size_t len, enum dma_data_direction dir,
147 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Christoph Hellwigce65d362018-12-03 14:04:32 +0100149 void *vaddr = page_address(page) + offset;
David S. Miller260489f2008-08-26 23:00:58 -0700150 struct iounit_struct *iounit = dev->archdata.iommu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 unsigned long ret, flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Christoph Hellwigce65d362018-12-03 14:04:32 +0100153 /* XXX So what is maxphys for us and how do drivers know it? */
154 if (!len || len > 256 * 1024)
155 return DMA_MAPPING_ERROR;
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 spin_lock_irqsave(&iounit->lock, flags);
158 ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
159 spin_unlock_irqrestore(&iounit->lock, flags);
160 return ret;
161}
162
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100163static int iounit_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
Christoph Hellwigce65d362018-12-03 14:04:32 +0100164 enum dma_data_direction dir, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
David S. Miller260489f2008-08-26 23:00:58 -0700166 struct iounit_struct *iounit = dev->archdata.iommu;
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100167 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 unsigned long flags;
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100169 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
172 spin_lock_irqsave(&iounit->lock, flags);
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100173 for_each_sg(sgl, sg, nents, i) {
Robert Reifaa83a262008-12-11 20:24:58 -0800174 sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
175 sg->dma_length = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177 spin_unlock_irqrestore(&iounit->lock, flags);
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100178 return nents;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Christoph Hellwigce65d362018-12-03 14:04:32 +0100181static void iounit_unmap_page(struct device *dev, dma_addr_t vaddr, size_t len,
182 enum dma_data_direction dir, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
David S. Miller260489f2008-08-26 23:00:58 -0700184 struct iounit_struct *iounit = dev->archdata.iommu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187 spin_lock_irqsave(&iounit->lock, flags);
188 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
189 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
190 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
191 for (len += vaddr; vaddr < len; vaddr++)
192 clear_bit(vaddr, iounit->bmap);
193 spin_unlock_irqrestore(&iounit->lock, flags);
194}
195
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100196static void iounit_unmap_sg(struct device *dev, struct scatterlist *sgl,
197 int nents, enum dma_data_direction dir, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
David S. Miller260489f2008-08-26 23:00:58 -0700199 struct iounit_struct *iounit = dev->archdata.iommu;
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100200 unsigned long flags, vaddr, len;
201 struct scatterlist *sg;
202 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 spin_lock_irqsave(&iounit->lock, flags);
Christoph Hellwig1e2934a2018-12-16 10:20:04 +0100205 for_each_sg(sgl, sg, nents, i) {
Robert Reifaa83a262008-12-11 20:24:58 -0800206 len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
207 vaddr = (sg->dma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
209 for (len += vaddr; vaddr < len; vaddr++)
210 clear_bit(vaddr, iounit->bmap);
211 }
212 spin_unlock_irqrestore(&iounit->lock, flags);
213}
214
215#ifdef CONFIG_SBUS
Christoph Hellwigce65d362018-12-03 14:04:32 +0100216static void *iounit_alloc(struct device *dev, size_t len,
217 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218{
David S. Miller4b1c5df2008-08-27 18:40:38 -0700219 struct iounit_struct *iounit = dev->archdata.iommu;
Christoph Hellwigce65d362018-12-03 14:04:32 +0100220 unsigned long va, addr, page, end, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 pgprot_t dvma_prot;
Sam Ravnborg19186602014-05-16 23:25:41 +0200222 iopte_t __iomem *iopte;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Christoph Hellwigce65d362018-12-03 14:04:32 +0100224 /* XXX So what is maxphys for us and how do drivers know it? */
225 if (!len || len > 256 * 1024)
226 return NULL;
227
228 len = PAGE_ALIGN(len);
Christoph Hellwig518a2f12018-12-14 09:00:40 +0100229 va = __get_free_pages(gfp | __GFP_ZERO, get_order(len));
Christoph Hellwigce65d362018-12-03 14:04:32 +0100230 if (!va)
231 return NULL;
232
233 addr = ret = sparc_dma_alloc_resource(dev, len);
234 if (!addr)
235 goto out_free_pages;
236 *dma_handle = addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
239 end = PAGE_ALIGN((addr + len));
240 while(addr < end) {
241 page = va;
242 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 pmd_t *pmdp;
244 pte_t *ptep;
245 long i;
246
Mike Rapoporte05c7b12020-06-08 21:33:05 -0700247 pmdp = pmd_off_k(addr);
Hugh Dickins7a19c362023-06-08 12:33:40 -0700248 ptep = pte_offset_kernel(pmdp, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
Mike Rapoporte05c7b12020-06-08 21:33:05 -0700251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
253
Sam Ravnborg19186602014-05-16 23:25:41 +0200254 iopte = iounit->page_table + i;
Sam Ravnborg6e6e4182016-04-22 19:41:06 +0200255 sbus_writel(iopte_val(MKIOPTE(__pa(page))), iopte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257 addr += PAGE_SIZE;
258 va += PAGE_SIZE;
259 }
260 flush_cache_all();
261 flush_tlb_all();
262
Christoph Hellwigce65d362018-12-03 14:04:32 +0100263 return (void *)ret;
264
265out_free_pages:
266 free_pages(va, get_order(len));
267 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
Christoph Hellwigce65d362018-12-03 14:04:32 +0100270static void iounit_free(struct device *dev, size_t size, void *cpu_addr,
271 dma_addr_t dma_addr, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 /* XXX Somebody please fill this in */
274}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275#endif
276
Christoph Hellwigce65d362018-12-03 14:04:32 +0100277static const struct dma_map_ops iounit_dma_ops = {
David S. Millerd894d962012-05-13 13:57:05 -0700278#ifdef CONFIG_SBUS
Christoph Hellwigce65d362018-12-03 14:04:32 +0100279 .alloc = iounit_alloc,
280 .free = iounit_free,
David S. Millerd894d962012-05-13 13:57:05 -0700281#endif
Christoph Hellwigce65d362018-12-03 14:04:32 +0100282 .map_page = iounit_map_page,
283 .unmap_page = iounit_unmap_page,
284 .map_sg = iounit_map_sg,
285 .unmap_sg = iounit_unmap_sg,
David S. Millerd894d962012-05-13 13:57:05 -0700286};