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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/*
2 * io-unit.c: IO-UNIT specific routines for memory management.
3 *
4 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 */
6
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/spinlock.h>
11#include <linux/mm.h>
12#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
13#include <linux/bitops.h>
14#include <linux/scatterlist.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17
18#include <asm/pgalloc.h>
19#include <asm/pgtable.h>
20#include <asm/io.h>
21#include <asm/io-unit.h>
22#include <asm/mxcc.h>
23#include <asm/cacheflush.h>
24#include <asm/tlbflush.h>
25#include <asm/dma.h>
26#include <asm/oplib.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 void __init iounit_iommu_init(struct platform_device *op)
39{
40 struct iounit_struct *iounit;
41 iopte_t *xpt, *xptend;
42
43 iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
44 if (!iounit) {
45 prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
46 prom_halt();
47 }
48
49 iounit->limit[0] = IOUNIT_BMAP1_START;
50 iounit->limit[1] = IOUNIT_BMAP2_START;
51 iounit->limit[2] = IOUNIT_BMAPM_START;
52 iounit->limit[3] = IOUNIT_BMAPM_END;
53 iounit->rotor[1] = IOUNIT_BMAP2_START;
54 iounit->rotor[2] = IOUNIT_BMAPM_START;
55
56 xpt = of_ioremap(&op->resource[2], 0, PAGE_SIZE * 16, "XPT");
57 if (!xpt) {
58 prom_printf("SUN4D: Cannot map External Page Table.");
59 prom_halt();
60 }
61
62 op->dev.archdata.iommu = iounit;
63 iounit->page_table = xpt;
64 spin_lock_init(&iounit->lock);
65
66 for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
67 xpt < xptend;)
68 iopte_val(*xpt++) = 0;
69}
70
71static int __init iounit_init(void)
72{
73 extern void sun4d_init_sbi_irq(void);
74 struct device_node *dp;
75
76 for_each_node_by_name(dp, "sbi") {
77 struct platform_device *op = of_find_device_by_node(dp);
78
79 iounit_iommu_init(op);
80 of_propagate_archdata(op);
81 }
82
83 sun4d_init_sbi_irq();
84
85 return 0;
86}
87
88subsys_initcall(iounit_init);
89
90/* One has to hold iounit->lock to call this */
91static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
92{
93 int i, j, k, npages;
94 unsigned long rotor, scan, limit;
95 iopte_t iopte;
96
97 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
98
99 /* A tiny bit of magic ingredience :) */
100 switch (npages) {
101 case 1: i = 0x0231; break;
102 case 2: i = 0x0132; break;
103 default: i = 0x0213; break;
104 }
105
106 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
107
108next: j = (i & 15);
109 rotor = iounit->rotor[j - 1];
110 limit = iounit->limit[j];
111 scan = rotor;
112nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
113 if (scan + npages > limit) {
114 if (limit != rotor) {
115 limit = rotor;
116 scan = iounit->limit[j - 1];
117 goto nexti;
118 }
119 i >>= 4;
120 if (!(i & 15))
121 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
122 goto next;
123 }
124 for (k = 1, scan++; k < npages; k++)
125 if (test_bit(scan++, iounit->bmap))
126 goto nexti;
127 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
128 scan -= npages;
129 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
130 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
131 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
132 set_bit(scan, iounit->bmap);
133 iounit->page_table[scan] = iopte;
134 }
135 IOD(("%08lx\n", vaddr));
136 return vaddr;
137}
138
139static __u32 iounit_get_scsi_one(struct device *dev, char *vaddr, unsigned long len)
140{
141 struct iounit_struct *iounit = dev->archdata.iommu;
142 unsigned long ret, flags;
143
144 spin_lock_irqsave(&iounit->lock, flags);
145 ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
146 spin_unlock_irqrestore(&iounit->lock, flags);
147 return ret;
148}
149
150static void iounit_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
151{
152 struct iounit_struct *iounit = dev->archdata.iommu;
153 unsigned long flags;
154
155 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
156 spin_lock_irqsave(&iounit->lock, flags);
157 while (sz != 0) {
158 --sz;
159 sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
160 sg->dma_length = sg->length;
161 sg = sg_next(sg);
162 }
163 spin_unlock_irqrestore(&iounit->lock, flags);
164}
165
166static void iounit_release_scsi_one(struct device *dev, __u32 vaddr, unsigned long len)
167{
168 struct iounit_struct *iounit = dev->archdata.iommu;
169 unsigned long flags;
170
171 spin_lock_irqsave(&iounit->lock, flags);
172 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
173 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
174 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
175 for (len += vaddr; vaddr < len; vaddr++)
176 clear_bit(vaddr, iounit->bmap);
177 spin_unlock_irqrestore(&iounit->lock, flags);
178}
179
180static void iounit_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
181{
182 struct iounit_struct *iounit = dev->archdata.iommu;
183 unsigned long flags;
184 unsigned long vaddr, len;
185
186 spin_lock_irqsave(&iounit->lock, flags);
187 while (sz != 0) {
188 --sz;
189 len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
190 vaddr = (sg->dma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
191 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
192 for (len += vaddr; vaddr < len; vaddr++)
193 clear_bit(vaddr, iounit->bmap);
194 sg = sg_next(sg);
195 }
196 spin_unlock_irqrestore(&iounit->lock, flags);
197}
198
199#ifdef CONFIG_SBUS
200static int iounit_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, unsigned long addr, int len)
201{
202 struct iounit_struct *iounit = dev->archdata.iommu;
203 unsigned long page, end;
204 pgprot_t dvma_prot;
205 iopte_t *iopte;
206
207 *pba = addr;
208
209 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
210 end = PAGE_ALIGN((addr + len));
211 while(addr < end) {
212 page = va;
213 {
214 pgd_t *pgdp;
215 pmd_t *pmdp;
216 pte_t *ptep;
217 long i;
218
219 pgdp = pgd_offset(&init_mm, addr);
220 pmdp = pmd_offset(pgdp, addr);
221 ptep = pte_offset_map(pmdp, addr);
222
223 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
224
225 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
226
227 iopte = (iopte_t *)(iounit->page_table + i);
228 *iopte = MKIOPTE(__pa(page));
229 }
230 addr += PAGE_SIZE;
231 va += PAGE_SIZE;
232 }
233 flush_cache_all();
234 flush_tlb_all();
235
236 return 0;
237}
238
239static void iounit_unmap_dma_area(struct device *dev, unsigned long addr, int len)
240{
241 /* XXX Somebody please fill this in */
242}
243#endif
244
245static const struct sparc32_dma_ops iounit_dma_ops = {
246 .get_scsi_one = iounit_get_scsi_one,
247 .get_scsi_sgl = iounit_get_scsi_sgl,
248 .release_scsi_one = iounit_release_scsi_one,
249 .release_scsi_sgl = iounit_release_scsi_sgl,
250#ifdef CONFIG_SBUS
251 .map_dma_area = iounit_map_dma_area,
252 .unmap_dma_area = iounit_unmap_dma_area,
253#endif
254};
255
256void __init ld_mmu_iounit(void)
257{
258 sparc32_dma_ops = &iounit_dma_ops;
259}