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5fe42d5b RM |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/slab.h> | |
bddcb5e7 | 4 | #include <linux/delay.h> |
5fe42d5b RM |
5 | #include <linux/mtd/mtd.h> |
6 | #include <linux/platform_device.h> | |
7 | #include <linux/bcma/bcma.h> | |
8 | ||
a2f74a7d RM |
9 | #include "bcm47xxsflash.h" |
10 | ||
5fe42d5b RM |
11 | MODULE_LICENSE("GPL"); |
12 | MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); | |
13 | ||
afffeec9 | 14 | static const char * const probes[] = { "bcm47xxpart", NULL }; |
5fe42d5b | 15 | |
bddcb5e7 RM |
16 | /************************************************** |
17 | * Various helpers | |
18 | **************************************************/ | |
19 | ||
20 | static void bcm47xxsflash_cmd(struct bcm47xxsflash *b47s, u32 opcode) | |
21 | { | |
22 | int i; | |
23 | ||
24 | b47s->cc_write(b47s, BCMA_CC_FLASHCTL, BCMA_CC_FLASHCTL_START | opcode); | |
25 | for (i = 0; i < 1000; i++) { | |
26 | if (!(b47s->cc_read(b47s, BCMA_CC_FLASHCTL) & | |
27 | BCMA_CC_FLASHCTL_BUSY)) | |
28 | return; | |
29 | cpu_relax(); | |
30 | } | |
31 | pr_err("Control command failed (timeout)!\n"); | |
32 | } | |
33 | ||
34 | static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout) | |
35 | { | |
36 | unsigned long deadline = jiffies + timeout; | |
37 | ||
38 | do { | |
39 | switch (b47s->type) { | |
40 | case BCM47XXSFLASH_TYPE_ST: | |
41 | bcm47xxsflash_cmd(b47s, OPCODE_ST_RDSR); | |
42 | if (!(b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & | |
43 | SR_ST_WIP)) | |
44 | return 0; | |
45 | break; | |
46 | case BCM47XXSFLASH_TYPE_ATMEL: | |
47 | bcm47xxsflash_cmd(b47s, OPCODE_AT_STATUS); | |
48 | if (b47s->cc_read(b47s, BCMA_CC_FLASHDATA) & | |
49 | SR_AT_READY) | |
50 | return 0; | |
51 | break; | |
52 | } | |
53 | ||
54 | cpu_relax(); | |
55 | udelay(1); | |
56 | } while (!time_after_eq(jiffies, deadline)); | |
57 | ||
58 | pr_err("Timeout waiting for flash to be ready!\n"); | |
59 | ||
60 | return -EBUSY; | |
61 | } | |
62 | ||
63 | /************************************************** | |
64 | * MTD ops | |
65 | **************************************************/ | |
66 | ||
c0fcbc56 RM |
67 | static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase) |
68 | { | |
69 | struct bcm47xxsflash *b47s = mtd->priv; | |
70 | int err; | |
71 | ||
72 | switch (b47s->type) { | |
73 | case BCM47XXSFLASH_TYPE_ST: | |
74 | bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); | |
75 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr); | |
76 | /* Newer flashes have "sub-sectors" which can be erased | |
77 | * independently with a new command: ST_SSE. The ST_SE command | |
78 | * erases 64KB just as before. | |
79 | */ | |
80 | if (b47s->blocksize < (64 * 1024)) | |
81 | bcm47xxsflash_cmd(b47s, OPCODE_ST_SSE); | |
82 | else | |
83 | bcm47xxsflash_cmd(b47s, OPCODE_ST_SE); | |
84 | break; | |
85 | case BCM47XXSFLASH_TYPE_ATMEL: | |
86 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1); | |
87 | bcm47xxsflash_cmd(b47s, OPCODE_AT_PAGE_ERASE); | |
88 | break; | |
89 | } | |
90 | ||
91 | err = bcm47xxsflash_poll(b47s, HZ); | |
92 | if (err) | |
93 | erase->state = MTD_ERASE_FAILED; | |
94 | else | |
95 | erase->state = MTD_ERASE_DONE; | |
96 | ||
97 | if (erase->callback) | |
98 | erase->callback(erase); | |
99 | ||
100 | return err; | |
101 | } | |
102 | ||
5fe42d5b RM |
103 | static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, |
104 | size_t *retlen, u_char *buf) | |
105 | { | |
a2f74a7d | 106 | struct bcm47xxsflash *b47s = mtd->priv; |
5fe42d5b RM |
107 | |
108 | /* Check address range */ | |
109 | if ((from + len) > mtd->size) | |
110 | return -EINVAL; | |
111 | ||
a2f74a7d | 112 | memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from), |
5fe42d5b | 113 | len); |
60aca067 | 114 | *retlen = len; |
5fe42d5b RM |
115 | |
116 | return len; | |
117 | } | |
118 | ||
13134f48 RM |
119 | static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len, |
120 | const u_char *buf) | |
121 | { | |
122 | struct bcm47xxsflash *b47s = mtd->priv; | |
123 | int written = 0; | |
124 | ||
125 | /* Enable writes */ | |
126 | bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN); | |
127 | ||
128 | /* Write first byte */ | |
129 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset); | |
130 | b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); | |
131 | ||
132 | /* Program page */ | |
133 | if (b47s->bcma_cc->core->id.rev < 20) { | |
134 | bcm47xxsflash_cmd(b47s, OPCODE_ST_PP); | |
135 | return 1; /* 1B written */ | |
136 | } | |
137 | ||
138 | /* Program page and set CSA (on newer chips we can continue writing) */ | |
139 | bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | OPCODE_ST_PP); | |
140 | offset++; | |
141 | len--; | |
142 | written++; | |
143 | ||
144 | while (len > 0) { | |
145 | /* Page boundary, another function call is needed */ | |
146 | if ((offset & 0xFF) == 0) | |
147 | break; | |
148 | ||
149 | bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | *buf++); | |
150 | offset++; | |
151 | len--; | |
152 | written++; | |
153 | } | |
154 | ||
155 | /* All done, drop CSA & poll */ | |
156 | b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0); | |
157 | udelay(1); | |
158 | if (bcm47xxsflash_poll(b47s, HZ / 10)) | |
159 | pr_err("Flash rejected dropping CSA\n"); | |
160 | ||
161 | return written; | |
162 | } | |
163 | ||
164 | static int bcm47xxsflash_write_at(struct mtd_info *mtd, u32 offset, size_t len, | |
165 | const u_char *buf) | |
166 | { | |
167 | struct bcm47xxsflash *b47s = mtd->priv; | |
168 | u32 mask = b47s->blocksize - 1; | |
169 | u32 page = (offset & ~mask) << 1; | |
170 | u32 byte = offset & mask; | |
171 | int written = 0; | |
172 | ||
173 | /* If we don't overwrite whole page, read it to the buffer first */ | |
174 | if (byte || (len < b47s->blocksize)) { | |
175 | int err; | |
176 | ||
177 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); | |
178 | bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_LOAD); | |
179 | /* 250 us for AT45DB321B */ | |
180 | err = bcm47xxsflash_poll(b47s, HZ / 1000); | |
181 | if (err) { | |
182 | pr_err("Timeout reading page 0x%X info buffer\n", page); | |
183 | return err; | |
184 | } | |
185 | } | |
186 | ||
187 | /* Change buffer content with our data */ | |
188 | while (len > 0) { | |
189 | /* Page boundary, another function call is needed */ | |
190 | if (byte == b47s->blocksize) | |
191 | break; | |
192 | ||
193 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++); | |
194 | b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++); | |
195 | bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_WRITE); | |
196 | len--; | |
197 | written++; | |
198 | } | |
199 | ||
200 | /* Program page with the buffer content */ | |
201 | b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page); | |
202 | bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_PROGRAM); | |
203 | ||
204 | return written; | |
205 | } | |
206 | ||
207 | static int bcm47xxsflash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
208 | size_t *retlen, const u_char *buf) | |
209 | { | |
210 | struct bcm47xxsflash *b47s = mtd->priv; | |
211 | int written; | |
212 | ||
213 | /* Writing functions can return without writing all passed data, for | |
214 | * example when the hardware is too old or when we git page boundary. | |
215 | */ | |
216 | while (len > 0) { | |
217 | switch (b47s->type) { | |
218 | case BCM47XXSFLASH_TYPE_ST: | |
219 | written = bcm47xxsflash_write_st(mtd, to, len, buf); | |
220 | break; | |
221 | case BCM47XXSFLASH_TYPE_ATMEL: | |
222 | written = bcm47xxsflash_write_at(mtd, to, len, buf); | |
223 | break; | |
224 | default: | |
225 | BUG_ON(1); | |
226 | } | |
227 | if (written < 0) { | |
228 | pr_err("Error writing at offset 0x%llX\n", to); | |
229 | return written; | |
230 | } | |
231 | to += (loff_t)written; | |
232 | len -= written; | |
233 | *retlen += written; | |
234 | buf += written; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
a2f74a7d | 240 | static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s) |
5fe42d5b | 241 | { |
a2f74a7d RM |
242 | struct mtd_info *mtd = &b47s->mtd; |
243 | ||
244 | mtd->priv = b47s; | |
5fe42d5b RM |
245 | mtd->name = "bcm47xxsflash"; |
246 | mtd->owner = THIS_MODULE; | |
5fe42d5b | 247 | |
13134f48 RM |
248 | mtd->type = MTD_NORFLASH; |
249 | mtd->flags = MTD_CAP_NORFLASH; | |
c0fcbc56 RM |
250 | mtd->size = b47s->size; |
251 | mtd->erasesize = b47s->blocksize; | |
13134f48 RM |
252 | mtd->writesize = 1; |
253 | mtd->writebufsize = 1; | |
c0fcbc56 RM |
254 | |
255 | mtd->_erase = bcm47xxsflash_erase; | |
256 | mtd->_read = bcm47xxsflash_read; | |
13134f48 | 257 | mtd->_write = bcm47xxsflash_write; |
5fe42d5b RM |
258 | } |
259 | ||
f1a7c9d3 RM |
260 | /************************************************** |
261 | * BCMA | |
262 | **************************************************/ | |
263 | ||
265dfbd9 RM |
264 | static int bcm47xxsflash_bcma_cc_read(struct bcm47xxsflash *b47s, u16 offset) |
265 | { | |
266 | return bcma_cc_read32(b47s->bcma_cc, offset); | |
267 | } | |
268 | ||
269 | static void bcm47xxsflash_bcma_cc_write(struct bcm47xxsflash *b47s, u16 offset, | |
270 | u32 value) | |
271 | { | |
272 | bcma_cc_write32(b47s->bcma_cc, offset, value); | |
273 | } | |
274 | ||
f1a7c9d3 | 275 | static int bcm47xxsflash_bcma_probe(struct platform_device *pdev) |
5fe42d5b RM |
276 | { |
277 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
a2f74a7d | 278 | struct bcm47xxsflash *b47s; |
5fe42d5b RM |
279 | int err; |
280 | ||
d2b1bd14 LC |
281 | b47s = devm_kzalloc(&pdev->dev, sizeof(*b47s), GFP_KERNEL); |
282 | if (!b47s) | |
283 | return -ENOMEM; | |
a2f74a7d RM |
284 | sflash->priv = b47s; |
285 | ||
41c81536 | 286 | b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash); |
265dfbd9 RM |
287 | b47s->cc_read = bcm47xxsflash_bcma_cc_read; |
288 | b47s->cc_write = bcm47xxsflash_bcma_cc_write; | |
41c81536 | 289 | |
1f816bc7 RM |
290 | switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) { |
291 | case BCMA_CC_FLASHT_STSER: | |
292 | b47s->type = BCM47XXSFLASH_TYPE_ST; | |
293 | break; | |
294 | case BCMA_CC_FLASHT_ATSER: | |
295 | b47s->type = BCM47XXSFLASH_TYPE_ATMEL; | |
296 | break; | |
297 | } | |
298 | ||
a2f74a7d RM |
299 | b47s->window = sflash->window; |
300 | b47s->blocksize = sflash->blocksize; | |
301 | b47s->numblocks = sflash->numblocks; | |
302 | b47s->size = sflash->size; | |
303 | bcm47xxsflash_fill_mtd(b47s); | |
5fe42d5b | 304 | |
a2f74a7d | 305 | err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); |
5fe42d5b RM |
306 | if (err) { |
307 | pr_err("Failed to register MTD device: %d\n", err); | |
d2b1bd14 | 308 | return err; |
5fe42d5b RM |
309 | } |
310 | ||
bddcb5e7 RM |
311 | if (bcm47xxsflash_poll(b47s, HZ / 10)) |
312 | pr_warn("Serial flash busy\n"); | |
313 | ||
5fe42d5b | 314 | return 0; |
5fe42d5b RM |
315 | } |
316 | ||
f1a7c9d3 | 317 | static int bcm47xxsflash_bcma_remove(struct platform_device *pdev) |
5fe42d5b RM |
318 | { |
319 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
a2f74a7d | 320 | struct bcm47xxsflash *b47s = sflash->priv; |
5fe42d5b | 321 | |
a2f74a7d | 322 | mtd_device_unregister(&b47s->mtd); |
5fe42d5b RM |
323 | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static struct platform_driver bcma_sflash_driver = { | |
f1a7c9d3 RM |
328 | .probe = bcm47xxsflash_bcma_probe, |
329 | .remove = bcm47xxsflash_bcma_remove, | |
5fe42d5b RM |
330 | .driver = { |
331 | .name = "bcma_sflash", | |
332 | .owner = THIS_MODULE, | |
333 | }, | |
334 | }; | |
335 | ||
f1a7c9d3 RM |
336 | /************************************************** |
337 | * Init | |
338 | **************************************************/ | |
339 | ||
8268df26 | 340 | module_platform_driver(bcma_sflash_driver); |