1/*
2 * Copyright (C) 2012 CERN (www.cern.ch)
3 * Author: Alessandro Rubini <rubini@gnudd.com>
4 *
5 * Released according to the GNU GPL, version 2 or any later version.
6 *
7 * This work is part of the White Rabbit project, a research effort led
8 * by CERN, the European Institute for Nuclear Research.
9 */
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/fmc.h>
13#include <linux/sdb.h>
14#include <linux/err.h>
15#include <linux/fmc-sdb.h>
16#include <asm/byteorder.h>
17
18static uint32_t __sdb_rd(struct fmc_device *fmc, unsigned long address,
19 int convert)
20{
21 uint32_t res = fmc_readl(fmc, address);
22 if (convert)
23 return __be32_to_cpu(res);
24 return res;
25}
26
27static struct sdb_array *__fmc_scan_sdb_tree(struct fmc_device *fmc,
28 unsigned long sdb_addr,
29 unsigned long reg_base, int level)
30{
31 uint32_t onew;
32 int i, j, n, convert = 0;
33 struct sdb_array *arr, *sub;
34
35 onew = fmc_readl(fmc, sdb_addr);
36 if (onew == SDB_MAGIC) {
37 /* Uh! If we are little-endian, we must convert */
38 if (SDB_MAGIC != __be32_to_cpu(SDB_MAGIC))
39 convert = 1;
40 } else if (onew == __be32_to_cpu(SDB_MAGIC)) {
41 /* ok, don't convert */
42 } else {
43 return ERR_PTR(-ENOENT);
44 }
45 /* So, the magic was there: get the count from offset 4*/
46 onew = __sdb_rd(fmc, sdb_addr + 4, convert);
47 n = __be16_to_cpu(*(uint16_t *)&onew);
48 arr = kzalloc(sizeof(*arr), GFP_KERNEL);
49 if (!arr)
50 return ERR_PTR(-ENOMEM);
51 arr->record = kcalloc(n, sizeof(arr->record[0]), GFP_KERNEL);
52 arr->subtree = kcalloc(n, sizeof(arr->subtree[0]), GFP_KERNEL);
53 if (!arr->record || !arr->subtree) {
54 kfree(arr->record);
55 kfree(arr->subtree);
56 kfree(arr);
57 return ERR_PTR(-ENOMEM);
58 }
59
60 arr->len = n;
61 arr->level = level;
62 arr->fmc = fmc;
63 for (i = 0; i < n; i++) {
64 union sdb_record *r;
65
66 for (j = 0; j < sizeof(arr->record[0]); j += 4) {
67 *(uint32_t *)((void *)(arr->record + i) + j) =
68 __sdb_rd(fmc, sdb_addr + (i * 64) + j, convert);
69 }
70 r = &arr->record[i];
71 arr->subtree[i] = ERR_PTR(-ENODEV);
72 if (r->empty.record_type == sdb_type_bridge) {
73 struct sdb_component *c = &r->bridge.sdb_component;
74 uint64_t subaddr = __be64_to_cpu(r->bridge.sdb_child);
75 uint64_t newbase = __be64_to_cpu(c->addr_first);
76
77 subaddr += reg_base;
78 newbase += reg_base;
79 sub = __fmc_scan_sdb_tree(fmc, subaddr, newbase,
80 level + 1);
81 arr->subtree[i] = sub; /* may be error */
82 if (IS_ERR(sub))
83 continue;
84 sub->parent = arr;
85 sub->baseaddr = newbase;
86 }
87 }
88 return arr;
89}
90
91int fmc_scan_sdb_tree(struct fmc_device *fmc, unsigned long address)
92{
93 struct sdb_array *ret;
94 if (fmc->sdb)
95 return -EBUSY;
96 ret = __fmc_scan_sdb_tree(fmc, address, 0 /* regs */, 0);
97 if (IS_ERR(ret))
98 return PTR_ERR(ret);
99 fmc->sdb = ret;
100 return 0;
101}
102EXPORT_SYMBOL(fmc_scan_sdb_tree);
103
104static void __fmc_sdb_free(struct sdb_array *arr)
105{
106 int i, n;
107
108 if (!arr)
109 return;
110 n = arr->len;
111 for (i = 0; i < n; i++) {
112 if (IS_ERR(arr->subtree[i]))
113 continue;
114 __fmc_sdb_free(arr->subtree[i]);
115 }
116 kfree(arr->record);
117 kfree(arr->subtree);
118 kfree(arr);
119}
120
121int fmc_free_sdb_tree(struct fmc_device *fmc)
122{
123 __fmc_sdb_free(fmc->sdb);
124 fmc->sdb = NULL;
125 return 0;
126}
127EXPORT_SYMBOL(fmc_free_sdb_tree);
128
129/* This helper calls reprogram and inizialized sdb as well */
130int fmc_reprogram_raw(struct fmc_device *fmc, struct fmc_driver *d,
131 void *gw, unsigned long len, int sdb_entry)
132{
133 int ret;
134
135 ret = fmc->op->reprogram_raw(fmc, d, gw, len);
136 if (ret < 0)
137 return ret;
138 if (sdb_entry < 0)
139 return ret;
140
141 /* We are required to find SDB at a given offset */
142 ret = fmc_scan_sdb_tree(fmc, sdb_entry);
143 if (ret < 0) {
144 dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
145 sdb_entry);
146 return -ENODEV;
147 }
148
149 return 0;
150}
151EXPORT_SYMBOL(fmc_reprogram_raw);
152
153/* This helper calls reprogram and inizialized sdb as well */
154int fmc_reprogram(struct fmc_device *fmc, struct fmc_driver *d, char *gw,
155 int sdb_entry)
156{
157 int ret;
158
159 ret = fmc->op->reprogram(fmc, d, gw);
160 if (ret < 0)
161 return ret;
162 if (sdb_entry < 0)
163 return ret;
164
165 /* We are required to find SDB at a given offset */
166 ret = fmc_scan_sdb_tree(fmc, sdb_entry);
167 if (ret < 0) {
168 dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
169 sdb_entry);
170 return -ENODEV;
171 }
172
173 return 0;
174}
175EXPORT_SYMBOL(fmc_reprogram);
176
177void fmc_show_sdb_tree(const struct fmc_device *fmc)
178{
179 pr_err("%s: not supported anymore, use debugfs to dump SDB\n",
180 __func__);
181}
182EXPORT_SYMBOL(fmc_show_sdb_tree);
183
184signed long fmc_find_sdb_device(struct sdb_array *tree,
185 uint64_t vid, uint32_t did, unsigned long *sz)
186{
187 signed long res = -ENODEV;
188 union sdb_record *r;
189 struct sdb_product *p;
190 struct sdb_component *c;
191 int i, n = tree->len;
192 uint64_t last, first;
193
194 /* FIXME: what if the first interconnect is not at zero? */
195 for (i = 0; i < n; i++) {
196 r = &tree->record[i];
197 c = &r->dev.sdb_component;
198 p = &c->product;
199
200 if (!IS_ERR(tree->subtree[i]))
201 res = fmc_find_sdb_device(tree->subtree[i],
202 vid, did, sz);
203 if (res >= 0)
204 return res + tree->baseaddr;
205 if (r->empty.record_type != sdb_type_device)
206 continue;
207 if (__be64_to_cpu(p->vendor_id) != vid)
208 continue;
209 if (__be32_to_cpu(p->device_id) != did)
210 continue;
211 /* found */
212 last = __be64_to_cpu(c->addr_last);
213 first = __be64_to_cpu(c->addr_first);
214 if (sz)
215 *sz = (typeof(*sz))(last + 1 - first);
216 return first + tree->baseaddr;
217 }
218 return res;
219}
220EXPORT_SYMBOL(fmc_find_sdb_device);
221