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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * 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
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/mm.h>
13#include <linux/bitops.h>
14#include <linux/dma-map-ops.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17
18#include <asm/io.h>
19#include <asm/io-unit.h>
20#include <asm/mxcc.h>
21#include <asm/cacheflush.h>
22#include <asm/tlbflush.h>
23#include <asm/dma.h>
24#include <asm/oplib.h>
25
26#include "mm_32.h"
27
28/* #define IOUNIT_DEBUG */
29#ifdef IOUNIT_DEBUG
30#define IOD(x) printk(x)
31#else
32#define IOD(x) do { } while (0)
33#endif
34
35#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
36#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
37
38static const struct dma_map_ops iounit_dma_ops;
39
40static void __init iounit_iommu_init(struct platform_device *op)
41{
42 struct iounit_struct *iounit;
43 iopte_t __iomem *xpt;
44 iopte_t __iomem *xptend;
45
46 iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
47 if (!iounit) {
48 prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
49 prom_halt();
50 }
51
52 iounit->limit[0] = IOUNIT_BMAP1_START;
53 iounit->limit[1] = IOUNIT_BMAP2_START;
54 iounit->limit[2] = IOUNIT_BMAPM_START;
55 iounit->limit[3] = IOUNIT_BMAPM_END;
56 iounit->rotor[1] = IOUNIT_BMAP2_START;
57 iounit->rotor[2] = IOUNIT_BMAPM_START;
58
59 xpt = of_ioremap(&op->resource[2], 0, PAGE_SIZE * 16, "XPT");
60 if (!xpt) {
61 prom_printf("SUN4D: Cannot map External Page Table.");
62 prom_halt();
63 }
64
65 op->dev.archdata.iommu = iounit;
66 iounit->page_table = xpt;
67 spin_lock_init(&iounit->lock);
68
69 xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
70 for (; xpt < xptend; xpt++)
71 sbus_writel(0, xpt);
72
73 op->dev.dma_ops = &iounit_dma_ops;
74}
75
76static int __init iounit_init(void)
77{
78 extern void sun4d_init_sbi_irq(void);
79 struct device_node *dp;
80
81 for_each_node_by_name(dp, "sbi") {
82 struct platform_device *op = of_find_device_by_node(dp);
83
84 iounit_iommu_init(op);
85 of_propagate_archdata(op);
86 }
87
88 sun4d_init_sbi_irq();
89
90 return 0;
91}
92
93subsys_initcall(iounit_init);
94
95/* One has to hold iounit->lock to call this */
96static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
97{
98 int i, j, k, npages;
99 unsigned long rotor, scan, limit;
100 iopte_t iopte;
101
102 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
103
104 /* A tiny bit of magic ingredience :) */
105 switch (npages) {
106 case 1: i = 0x0231; break;
107 case 2: i = 0x0132; break;
108 default: i = 0x0213; break;
109 }
110
111 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
112
113next: j = (i & 15);
114 rotor = iounit->rotor[j - 1];
115 limit = iounit->limit[j];
116 scan = rotor;
117nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
118 if (scan + npages > limit) {
119 if (limit != rotor) {
120 limit = rotor;
121 scan = iounit->limit[j - 1];
122 goto nexti;
123 }
124 i >>= 4;
125 if (!(i & 15))
126 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
127 goto next;
128 }
129 for (k = 1, scan++; k < npages; k++)
130 if (test_bit(scan++, iounit->bmap))
131 goto nexti;
132 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
133 scan -= npages;
134 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
135 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
136 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
137 set_bit(scan, iounit->bmap);
138 sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
139 }
140 IOD(("%08lx\n", vaddr));
141 return vaddr;
142}
143
144static dma_addr_t iounit_map_page(struct device *dev, struct page *page,
145 unsigned long offset, size_t len, enum dma_data_direction dir,
146 unsigned long attrs)
147{
148 void *vaddr = page_address(page) + offset;
149 struct iounit_struct *iounit = dev->archdata.iommu;
150 unsigned long ret, flags;
151
152 /* XXX So what is maxphys for us and how do drivers know it? */
153 if (!len || len > 256 * 1024)
154 return DMA_MAPPING_ERROR;
155
156 spin_lock_irqsave(&iounit->lock, flags);
157 ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
158 spin_unlock_irqrestore(&iounit->lock, flags);
159 return ret;
160}
161
162static int iounit_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
163 enum dma_data_direction dir, unsigned long attrs)
164{
165 struct iounit_struct *iounit = dev->archdata.iommu;
166 struct scatterlist *sg;
167 unsigned long flags;
168 int i;
169
170 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
171 spin_lock_irqsave(&iounit->lock, flags);
172 for_each_sg(sgl, sg, nents, i) {
173 sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
174 sg->dma_length = sg->length;
175 }
176 spin_unlock_irqrestore(&iounit->lock, flags);
177 return nents;
178}
179
180static void iounit_unmap_page(struct device *dev, dma_addr_t vaddr, size_t len,
181 enum dma_data_direction dir, unsigned long attrs)
182{
183 struct iounit_struct *iounit = dev->archdata.iommu;
184 unsigned long flags;
185
186 spin_lock_irqsave(&iounit->lock, flags);
187 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
188 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
189 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
190 for (len += vaddr; vaddr < len; vaddr++)
191 clear_bit(vaddr, iounit->bmap);
192 spin_unlock_irqrestore(&iounit->lock, flags);
193}
194
195static void iounit_unmap_sg(struct device *dev, struct scatterlist *sgl,
196 int nents, enum dma_data_direction dir, unsigned long attrs)
197{
198 struct iounit_struct *iounit = dev->archdata.iommu;
199 unsigned long flags, vaddr, len;
200 struct scatterlist *sg;
201 int i;
202
203 spin_lock_irqsave(&iounit->lock, flags);
204 for_each_sg(sgl, sg, nents, i) {
205 len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
206 vaddr = (sg->dma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
207 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
208 for (len += vaddr; vaddr < len; vaddr++)
209 clear_bit(vaddr, iounit->bmap);
210 }
211 spin_unlock_irqrestore(&iounit->lock, flags);
212}
213
214#ifdef CONFIG_SBUS
215static void *iounit_alloc(struct device *dev, size_t len,
216 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
217{
218 struct iounit_struct *iounit = dev->archdata.iommu;
219 unsigned long va, addr, page, end, ret;
220 pgprot_t dvma_prot;
221 iopte_t __iomem *iopte;
222
223 /* XXX So what is maxphys for us and how do drivers know it? */
224 if (!len || len > 256 * 1024)
225 return NULL;
226
227 len = PAGE_ALIGN(len);
228 va = __get_free_pages(gfp | __GFP_ZERO, get_order(len));
229 if (!va)
230 return NULL;
231
232 addr = ret = sparc_dma_alloc_resource(dev, len);
233 if (!addr)
234 goto out_free_pages;
235 *dma_handle = addr;
236
237 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
238 end = PAGE_ALIGN((addr + len));
239 while(addr < end) {
240 page = va;
241 {
242 pmd_t *pmdp;
243 pte_t *ptep;
244 long i;
245
246 pmdp = pmd_off_k(addr);
247 ptep = pte_offset_map(pmdp, addr);
248
249 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
250
251 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
252
253 iopte = iounit->page_table + i;
254 sbus_writel(iopte_val(MKIOPTE(__pa(page))), iopte);
255 }
256 addr += PAGE_SIZE;
257 va += PAGE_SIZE;
258 }
259 flush_cache_all();
260 flush_tlb_all();
261
262 return (void *)ret;
263
264out_free_pages:
265 free_pages(va, get_order(len));
266 return NULL;
267}
268
269static void iounit_free(struct device *dev, size_t size, void *cpu_addr,
270 dma_addr_t dma_addr, unsigned long attrs)
271{
272 /* XXX Somebody please fill this in */
273}
274#endif
275
276static const struct dma_map_ops iounit_dma_ops = {
277#ifdef CONFIG_SBUS
278 .alloc = iounit_alloc,
279 .free = iounit_free,
280#endif
281 .map_page = iounit_map_page,
282 .unmap_page = iounit_unmap_page,
283 .map_sg = iounit_map_sg,
284 .unmap_sg = iounit_unmap_sg,
285};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * 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
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/mm.h>
13#include <linux/bitops.h>
14#include <linux/dma-map-ops.h>
15#include <linux/of.h>
16#include <linux/of_platform.h>
17#include <linux/platform_device.h>
18
19#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>
25#include <asm/oplib.h>
26
27#include "mm_32.h"
28
29/* #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
39static const struct dma_map_ops iounit_dma_ops;
40
41static void __init iounit_iommu_init(struct platform_device *op)
42{
43 struct iounit_struct *iounit;
44 iopte_t __iomem *xpt;
45 iopte_t __iomem *xptend;
46
47 iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
48 if (!iounit) {
49 prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
50 prom_halt();
51 }
52
53 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
60 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();
64 }
65
66 op->dev.archdata.iommu = iounit;
67 iounit->page_table = xpt;
68 spin_lock_init(&iounit->lock);
69
70 xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
71 for (; xpt < xptend; xpt++)
72 sbus_writel(0, xpt);
73
74 op->dev.dma_ops = &iounit_dma_ops;
75}
76
77static 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") {
83 struct platform_device *op = of_find_device_by_node(dp);
84
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
96/* 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);
139 sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
140 }
141 IOD(("%08lx\n", vaddr));
142 return vaddr;
143}
144
145static 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)
148{
149 void *vaddr = page_address(page) + offset;
150 struct iounit_struct *iounit = dev->archdata.iommu;
151 unsigned long ret, flags;
152
153 /* 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
157 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
163static int iounit_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
164 enum dma_data_direction dir, unsigned long attrs)
165{
166 struct iounit_struct *iounit = dev->archdata.iommu;
167 struct scatterlist *sg;
168 unsigned long flags;
169 int i;
170
171 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
172 spin_lock_irqsave(&iounit->lock, flags);
173 for_each_sg(sgl, sg, nents, i) {
174 sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
175 sg->dma_length = sg->length;
176 }
177 spin_unlock_irqrestore(&iounit->lock, flags);
178 return nents;
179}
180
181static void iounit_unmap_page(struct device *dev, dma_addr_t vaddr, size_t len,
182 enum dma_data_direction dir, unsigned long attrs)
183{
184 struct iounit_struct *iounit = dev->archdata.iommu;
185 unsigned long flags;
186
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
196static void iounit_unmap_sg(struct device *dev, struct scatterlist *sgl,
197 int nents, enum dma_data_direction dir, unsigned long attrs)
198{
199 struct iounit_struct *iounit = dev->archdata.iommu;
200 unsigned long flags, vaddr, len;
201 struct scatterlist *sg;
202 int i;
203
204 spin_lock_irqsave(&iounit->lock, flags);
205 for_each_sg(sgl, sg, nents, i) {
206 len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
207 vaddr = (sg->dma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
208 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
216static void *iounit_alloc(struct device *dev, size_t len,
217 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
218{
219 struct iounit_struct *iounit = dev->archdata.iommu;
220 unsigned long va, addr, page, end, ret;
221 pgprot_t dvma_prot;
222 iopte_t __iomem *iopte;
223
224 /* 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);
229 va = __get_free_pages(gfp | __GFP_ZERO, get_order(len));
230 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;
237
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 {
243 pmd_t *pmdp;
244 pte_t *ptep;
245 long i;
246
247 pmdp = pmd_off_k(addr);
248 ptep = pte_offset_kernel(pmdp, addr);
249
250 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
251
252 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
253
254 iopte = iounit->page_table + i;
255 sbus_writel(iopte_val(MKIOPTE(__pa(page))), iopte);
256 }
257 addr += PAGE_SIZE;
258 va += PAGE_SIZE;
259 }
260 flush_cache_all();
261 flush_tlb_all();
262
263 return (void *)ret;
264
265out_free_pages:
266 free_pages(va, get_order(len));
267 return NULL;
268}
269
270static void iounit_free(struct device *dev, size_t size, void *cpu_addr,
271 dma_addr_t dma_addr, unsigned long attrs)
272{
273 /* XXX Somebody please fill this in */
274}
275#endif
276
277static const struct dma_map_ops iounit_dma_ops = {
278#ifdef CONFIG_SBUS
279 .alloc = iounit_alloc,
280 .free = iounit_free,
281#endif
282 .map_page = iounit_map_page,
283 .unmap_page = iounit_unmap_page,
284 .map_sg = iounit_map_sg,
285 .unmap_sg = iounit_unmap_sg,
286};