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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>
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
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 of_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 of_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
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
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
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, __u32 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
242}
243#endif
244
245static char *iounit_lockarea(char *vaddr, unsigned long len)
246{
247
248 return vaddr;
249}
250
251static void iounit_unlockarea(char *vaddr, unsigned long len)
252{
253
254}
255
256void __init ld_mmu_iounit(void)
257{
258 BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
259 BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
260
261 BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
262 BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
263 BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
264 BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
265
266#ifdef CONFIG_SBUS
267 BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
268 BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
269#endif
270}
271
