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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/highmem.h>
14#include <linux/bitops.h>
15#include <linux/scatterlist.h>
16#include <linux/of.h>
17#include <linux/of_device.h>
18
19#include <asm/pgalloc.h>
20#include <asm/pgtable.h>
21#include <asm/io.h>
22#include <asm/io-unit.h>
23#include <asm/mxcc.h>
24#include <asm/cacheflush.h>
25#include <asm/tlbflush.h>
26#include <asm/dma.h>
27#include <asm/oplib.h>
28
29#include "mm_32.h"
30
31
32#ifdef IOUNIT_DEBUG
33#define IOD(x) printk(x)
34#else
35#define IOD(x) do { } while (0)
36#endif
37
38#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
39#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
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
75static int __init iounit_init(void)
76{
77 extern void sun4d_init_sbi_irq(void);
78 struct device_node *dp;
79
80 for_each_node_by_name(dp, "sbi") {
81 struct platform_device *op = of_find_device_by_node(dp);
82
83 iounit_iommu_init(op);
84 of_propagate_archdata(op);
85 }
86
87 sun4d_init_sbi_irq();
88
89 return 0;
90}
91
92subsys_initcall(iounit_init);
93
94
95static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
96{
97 int i, j, k, npages;
98 unsigned long rotor, scan, limit;
99 iopte_t iopte;
100
101 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
102
103
104 switch (npages) {
105 case 1: i = 0x0231; break;
106 case 2: i = 0x0132; break;
107 default: i = 0x0213; break;
108 }
109
110 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
111
112next: j = (i & 15);
113 rotor = iounit->rotor[j - 1];
114 limit = iounit->limit[j];
115 scan = rotor;
116nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
117 if (scan + npages > limit) {
118 if (limit != rotor) {
119 limit = rotor;
120 scan = iounit->limit[j - 1];
121 goto nexti;
122 }
123 i >>= 4;
124 if (!(i & 15))
125 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
126 goto next;
127 }
128 for (k = 1, scan++; k < npages; k++)
129 if (test_bit(scan++, iounit->bmap))
130 goto nexti;
131 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
132 scan -= npages;
133 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
134 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
135 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
136 set_bit(scan, iounit->bmap);
137 sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
138 }
139 IOD(("%08lx\n", vaddr));
140 return vaddr;
141}
142
143static __u32 iounit_get_scsi_one(struct device *dev, char *vaddr, unsigned long len)
144{
145 struct iounit_struct *iounit = dev->archdata.iommu;
146 unsigned long ret, flags;
147
148 spin_lock_irqsave(&iounit->lock, flags);
149 ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
150 spin_unlock_irqrestore(&iounit->lock, flags);
151 return ret;
152}
153
154static void iounit_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
155{
156 struct iounit_struct *iounit = dev->archdata.iommu;
157 unsigned long flags;
158
159
160 spin_lock_irqsave(&iounit->lock, flags);
161 while (sz != 0) {
162 --sz;
163 sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
164 sg->dma_length = sg->length;
165 sg = sg_next(sg);
166 }
167 spin_unlock_irqrestore(&iounit->lock, flags);
168}
169
170static void iounit_release_scsi_one(struct device *dev, __u32 vaddr, unsigned long len)
171{
172 struct iounit_struct *iounit = dev->archdata.iommu;
173 unsigned long flags;
174
175 spin_lock_irqsave(&iounit->lock, flags);
176 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
177 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
178 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
179 for (len += vaddr; vaddr < len; vaddr++)
180 clear_bit(vaddr, iounit->bmap);
181 spin_unlock_irqrestore(&iounit->lock, flags);
182}
183
184static void iounit_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
185{
186 struct iounit_struct *iounit = dev->archdata.iommu;
187 unsigned long flags;
188 unsigned long vaddr, len;
189
190 spin_lock_irqsave(&iounit->lock, flags);
191 while (sz != 0) {
192 --sz;
193 len = ((sg->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
194 vaddr = (sg->dma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
195 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
196 for (len += vaddr; vaddr < len; vaddr++)
197 clear_bit(vaddr, iounit->bmap);
198 sg = sg_next(sg);
199 }
200 spin_unlock_irqrestore(&iounit->lock, flags);
201}
202
203#ifdef CONFIG_SBUS
204static int iounit_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, unsigned long addr, int len)
205{
206 struct iounit_struct *iounit = dev->archdata.iommu;
207 unsigned long page, end;
208 pgprot_t dvma_prot;
209 iopte_t __iomem *iopte;
210
211 *pba = addr;
212
213 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
214 end = PAGE_ALIGN((addr + len));
215 while(addr < end) {
216 page = va;
217 {
218 pgd_t *pgdp;
219 pmd_t *pmdp;
220 pte_t *ptep;
221 long i;
222
223 pgdp = pgd_offset(&init_mm, addr);
224 pmdp = pmd_offset(pgdp, addr);
225 ptep = pte_offset_map(pmdp, addr);
226
227 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
228
229 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
230
231 iopte = iounit->page_table + i;
232 sbus_writel(iopte_val(MKIOPTE(__pa(page))), iopte);
233 }
234 addr += PAGE_SIZE;
235 va += PAGE_SIZE;
236 }
237 flush_cache_all();
238 flush_tlb_all();
239
240 return 0;
241}
242
243static void iounit_unmap_dma_area(struct device *dev, unsigned long addr, int len)
244{
245
246}
247#endif
248
249static const struct sparc32_dma_ops iounit_dma_ops = {
250 .get_scsi_one = iounit_get_scsi_one,
251 .get_scsi_sgl = iounit_get_scsi_sgl,
252 .release_scsi_one = iounit_release_scsi_one,
253 .release_scsi_sgl = iounit_release_scsi_sgl,
254#ifdef CONFIG_SBUS
255 .map_dma_area = iounit_map_dma_area,
256 .unmap_dma_area = iounit_unmap_dma_area,
257#endif
258};
259
260void __init ld_mmu_iounit(void)
261{
262 sparc32_dma_ops = &iounit_dma_ops;
263}
264
