1
2
3
4#include <linux/clk.h>
5#include <linux/completion.h>
6#include <linux/dmaengine.h>
7#include <linux/dma-direction.h>
8#include <linux/dma-mapping.h>
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/iopoll.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14
15#include <linux/mtd/mtd.h>
16#include <linux/mtd/rawnand.h>
17#include <linux/mtd/nand.h>
18
19#include <linux/platform_device.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/units.h>
24#include <asm/unaligned.h>
25
26#define EBU_CLC 0x000
27#define EBU_CLC_RST 0x00000000u
28
29#define EBU_ADDR_SEL(n) (0x020 + (n) * 4)
30
31#define EBU_ADDR_MASK(x) ((x) << 4)
32#define EBU_ADDR_SEL_REGEN 0x1
33
34#define EBU_BUSCON(n) (0x060 + (n) * 4)
35#define EBU_BUSCON_CMULT_V4 0x1
36#define EBU_BUSCON_RECOVC(n) ((n) << 2)
37#define EBU_BUSCON_HOLDC(n) ((n) << 4)
38#define EBU_BUSCON_WAITRDC(n) ((n) << 6)
39#define EBU_BUSCON_WAITWRC(n) ((n) << 8)
40#define EBU_BUSCON_BCGEN_CS 0x0
41#define EBU_BUSCON_SETUP_EN BIT(22)
42#define EBU_BUSCON_ALEC 0xC000
43
44#define EBU_CON 0x0B0
45#define EBU_CON_NANDM_EN BIT(0)
46#define EBU_CON_NANDM_DIS 0x0
47#define EBU_CON_CSMUX_E_EN BIT(1)
48#define EBU_CON_ALE_P_LOW BIT(2)
49#define EBU_CON_CLE_P_LOW BIT(3)
50#define EBU_CON_CS_P_LOW BIT(4)
51#define EBU_CON_SE_P_LOW BIT(5)
52#define EBU_CON_WP_P_LOW BIT(6)
53#define EBU_CON_PRE_P_LOW BIT(7)
54#define EBU_CON_IN_CS_S(n) ((n) << 8)
55#define EBU_CON_OUT_CS_S(n) ((n) << 10)
56#define EBU_CON_LAT_EN_CS_P ((0x3D) << 18)
57
58#define EBU_WAIT 0x0B4
59#define EBU_WAIT_RDBY BIT(0)
60#define EBU_WAIT_WR_C BIT(3)
61
62#define HSNAND_CTL1 0x110
63#define HSNAND_CTL1_ADDR_SHIFT 24
64
65#define HSNAND_CTL2 0x114
66#define HSNAND_CTL2_ADDR_SHIFT 8
67#define HSNAND_CTL2_CYC_N_V5 (0x2 << 16)
68
69#define HSNAND_INT_MSK_CTL 0x124
70#define HSNAND_INT_MSK_CTL_WR_C BIT(4)
71
72#define HSNAND_INT_STA 0x128
73#define HSNAND_INT_STA_WR_C BIT(4)
74
75#define HSNAND_CTL 0x130
76#define HSNAND_CTL_ENABLE_ECC BIT(0)
77#define HSNAND_CTL_GO BIT(2)
78#define HSNAND_CTL_CE_SEL_CS(n) BIT(3 + (n))
79#define HSNAND_CTL_RW_READ 0x0
80#define HSNAND_CTL_RW_WRITE BIT(10)
81#define HSNAND_CTL_ECC_OFF_V8TH BIT(11)
82#define HSNAND_CTL_CKFF_EN 0x0
83#define HSNAND_CTL_MSG_EN BIT(17)
84
85#define HSNAND_PARA0 0x13c
86#define HSNAND_PARA0_PAGE_V8192 0x3
87#define HSNAND_PARA0_PIB_V256 (0x3 << 4)
88#define HSNAND_PARA0_BYP_EN_NP 0x0
89#define HSNAND_PARA0_BYP_DEC_NP 0x0
90#define HSNAND_PARA0_TYPE_ONFI BIT(18)
91#define HSNAND_PARA0_ADEP_EN BIT(21)
92
93#define HSNAND_CMSG_0 0x150
94#define HSNAND_CMSG_1 0x154
95
96#define HSNAND_ALE_OFFS BIT(2)
97#define HSNAND_CLE_OFFS BIT(3)
98#define HSNAND_CS_OFFS BIT(4)
99
100#define HSNAND_ECC_OFFSET 0x008
101
102#define NAND_DATA_IFACE_CHECK_ONLY -1
103
104#define MAX_CS 2
105
106#define USEC_PER_SEC 1000000L
107
108struct ebu_nand_cs {
109 void __iomem *chipaddr;
110 dma_addr_t nand_pa;
111 u32 addr_sel;
112};
113
114struct ebu_nand_controller {
115 struct nand_controller controller;
116 struct nand_chip chip;
117 struct device *dev;
118 void __iomem *ebu;
119 void __iomem *hsnand;
120 struct dma_chan *dma_tx;
121 struct dma_chan *dma_rx;
122 struct completion dma_access_complete;
123 unsigned long clk_rate;
124 struct clk *clk;
125 u32 nd_para0;
126 u8 cs_num;
127 struct ebu_nand_cs cs[MAX_CS];
128};
129
130static inline struct ebu_nand_controller *nand_to_ebu(struct nand_chip *chip)
131{
132 return container_of(chip, struct ebu_nand_controller, chip);
133}
134
135static int ebu_nand_waitrdy(struct nand_chip *chip, int timeout_ms)
136{
137 struct ebu_nand_controller *ctrl = nand_to_ebu(chip);
138 u32 status;
139
140 return readl_poll_timeout(ctrl->ebu + EBU_WAIT, status,
141 (status & EBU_WAIT_RDBY) ||
142 (status & EBU_WAIT_WR_C), 20, timeout_ms);
143}
144
145static u8 ebu_nand_readb(struct nand_chip *chip)
146{
147 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
148 u8 cs_num = ebu_host->cs_num;
149 u8 val;
150
151 val = readb(ebu_host->cs[cs_num].chipaddr + HSNAND_CS_OFFS);
152 ebu_nand_waitrdy(chip, 1000);
153 return val;
154}
155
156static void ebu_nand_writeb(struct nand_chip *chip, u32 offset, u8 value)
157{
158 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
159 u8 cs_num = ebu_host->cs_num;
160
161 writeb(value, ebu_host->cs[cs_num].chipaddr + offset);
162 ebu_nand_waitrdy(chip, 1000);
163}
164
165static void ebu_read_buf(struct nand_chip *chip, u_char *buf, unsigned int len)
166{
167 int i;
168
169 for (i = 0; i < len; i++)
170 buf[i] = ebu_nand_readb(chip);
171}
172
173static void ebu_write_buf(struct nand_chip *chip, const u_char *buf, int len)
174{
175 int i;
176
177 for (i = 0; i < len; i++)
178 ebu_nand_writeb(chip, HSNAND_CS_OFFS, buf[i]);
179}
180
181static void ebu_nand_disable(struct nand_chip *chip)
182{
183 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
184
185 writel(0, ebu_host->ebu + EBU_CON);
186}
187
188static void ebu_select_chip(struct nand_chip *chip)
189{
190 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
191 void __iomem *nand_con = ebu_host->ebu + EBU_CON;
192 u32 cs = ebu_host->cs_num;
193
194 writel(EBU_CON_NANDM_EN | EBU_CON_CSMUX_E_EN | EBU_CON_CS_P_LOW |
195 EBU_CON_SE_P_LOW | EBU_CON_WP_P_LOW | EBU_CON_PRE_P_LOW |
196 EBU_CON_IN_CS_S(cs) | EBU_CON_OUT_CS_S(cs) |
197 EBU_CON_LAT_EN_CS_P, nand_con);
198}
199
200static int ebu_nand_set_timings(struct nand_chip *chip, int csline,
201 const struct nand_interface_config *conf)
202{
203 struct ebu_nand_controller *ctrl = nand_to_ebu(chip);
204 unsigned int rate = clk_get_rate(ctrl->clk) / HZ_PER_MHZ;
205 unsigned int period = DIV_ROUND_UP(USEC_PER_SEC, rate);
206 const struct nand_sdr_timings *timings;
207 u32 trecov, thold, twrwait, trdwait;
208 u32 reg = 0;
209
210 timings = nand_get_sdr_timings(conf);
211 if (IS_ERR(timings))
212 return PTR_ERR(timings);
213
214 if (csline == NAND_DATA_IFACE_CHECK_ONLY)
215 return 0;
216
217 trecov = DIV_ROUND_UP(max(timings->tREA_max, timings->tREH_min),
218 period);
219 reg |= EBU_BUSCON_RECOVC(trecov);
220
221 thold = DIV_ROUND_UP(max(timings->tDH_min, timings->tDS_min), period);
222 reg |= EBU_BUSCON_HOLDC(thold);
223
224 trdwait = DIV_ROUND_UP(max(timings->tRC_min, timings->tREH_min),
225 period);
226 reg |= EBU_BUSCON_WAITRDC(trdwait);
227
228 twrwait = DIV_ROUND_UP(max(timings->tWC_min, timings->tWH_min), period);
229 reg |= EBU_BUSCON_WAITWRC(twrwait);
230
231 reg |= EBU_BUSCON_CMULT_V4 | EBU_BUSCON_BCGEN_CS | EBU_BUSCON_ALEC |
232 EBU_BUSCON_SETUP_EN;
233
234 writel(reg, ctrl->ebu + EBU_BUSCON(ctrl->cs_num));
235
236 return 0;
237}
238
239static int ebu_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
240 struct mtd_oob_region *oobregion)
241{
242 struct nand_chip *chip = mtd_to_nand(mtd);
243
244 if (section)
245 return -ERANGE;
246
247 oobregion->offset = HSNAND_ECC_OFFSET;
248 oobregion->length = chip->ecc.total;
249
250 return 0;
251}
252
253static int ebu_nand_ooblayout_free(struct mtd_info *mtd, int section,
254 struct mtd_oob_region *oobregion)
255{
256 struct nand_chip *chip = mtd_to_nand(mtd);
257
258 if (section)
259 return -ERANGE;
260
261 oobregion->offset = chip->ecc.total + HSNAND_ECC_OFFSET;
262 oobregion->length = mtd->oobsize - oobregion->offset;
263
264 return 0;
265}
266
267static const struct mtd_ooblayout_ops ebu_nand_ooblayout_ops = {
268 .ecc = ebu_nand_ooblayout_ecc,
269 .free = ebu_nand_ooblayout_free,
270};
271
272static void ebu_dma_rx_callback(void *cookie)
273{
274 struct ebu_nand_controller *ebu_host = cookie;
275
276 dmaengine_terminate_async(ebu_host->dma_rx);
277
278 complete(&ebu_host->dma_access_complete);
279}
280
281static void ebu_dma_tx_callback(void *cookie)
282{
283 struct ebu_nand_controller *ebu_host = cookie;
284
285 dmaengine_terminate_async(ebu_host->dma_tx);
286
287 complete(&ebu_host->dma_access_complete);
288}
289
290static int ebu_dma_start(struct ebu_nand_controller *ebu_host, u32 dir,
291 const u8 *buf, u32 len)
292{
293 struct dma_async_tx_descriptor *tx;
294 struct completion *dma_completion;
295 dma_async_tx_callback callback;
296 struct dma_chan *chan;
297 dma_cookie_t cookie;
298 unsigned long flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
299 dma_addr_t buf_dma;
300 int ret;
301 u32 timeout;
302
303 if (dir == DMA_DEV_TO_MEM) {
304 chan = ebu_host->dma_rx;
305 dma_completion = &ebu_host->dma_access_complete;
306 callback = ebu_dma_rx_callback;
307 } else {
308 chan = ebu_host->dma_tx;
309 dma_completion = &ebu_host->dma_access_complete;
310 callback = ebu_dma_tx_callback;
311 }
312
313 buf_dma = dma_map_single(chan->device->dev, (void *)buf, len, dir);
314 if (dma_mapping_error(chan->device->dev, buf_dma)) {
315 dev_err(ebu_host->dev, "Failed to map DMA buffer\n");
316 ret = -EIO;
317 goto err_unmap;
318 }
319
320 tx = dmaengine_prep_slave_single(chan, buf_dma, len, dir, flags);
321 if (!tx) {
322 ret = -ENXIO;
323 goto err_unmap;
324 }
325
326 tx->callback = callback;
327 tx->callback_param = ebu_host;
328 cookie = tx->tx_submit(tx);
329
330 ret = dma_submit_error(cookie);
331 if (ret) {
332 dev_err(ebu_host->dev, "dma_submit_error %d\n", cookie);
333 ret = -EIO;
334 goto err_unmap;
335 }
336
337 init_completion(dma_completion);
338 dma_async_issue_pending(chan);
339
340
341 timeout = wait_for_completion_timeout(dma_completion, msecs_to_jiffies(1000));
342 if (!timeout) {
343 dev_err(ebu_host->dev, "I/O Error in DMA RX (status %d)\n",
344 dmaengine_tx_status(chan, cookie, NULL));
345 dmaengine_terminate_sync(chan);
346 ret = -ETIMEDOUT;
347 goto err_unmap;
348 }
349
350 return 0;
351
352err_unmap:
353 dma_unmap_single(ebu_host->dev, buf_dma, len, dir);
354
355 return ret;
356}
357
358static void ebu_nand_trigger(struct ebu_nand_controller *ebu_host,
359 int page, u32 cmd)
360{
361 unsigned int val;
362
363 val = cmd | (page & 0xFF) << HSNAND_CTL1_ADDR_SHIFT;
364 writel(val, ebu_host->hsnand + HSNAND_CTL1);
365 val = (page & 0xFFFF00) >> 8 | HSNAND_CTL2_CYC_N_V5;
366 writel(val, ebu_host->hsnand + HSNAND_CTL2);
367
368 writel(ebu_host->nd_para0, ebu_host->hsnand + HSNAND_PARA0);
369
370
371 writel(0xFFFFFFFF, ebu_host->hsnand + HSNAND_CMSG_0);
372 writel(0xFFFFFFFF, ebu_host->hsnand + HSNAND_CMSG_1);
373
374 writel(HSNAND_INT_MSK_CTL_WR_C,
375 ebu_host->hsnand + HSNAND_INT_MSK_CTL);
376
377 if (!cmd)
378 val = HSNAND_CTL_RW_READ;
379 else
380 val = HSNAND_CTL_RW_WRITE;
381
382 writel(HSNAND_CTL_MSG_EN | HSNAND_CTL_CKFF_EN |
383 HSNAND_CTL_ECC_OFF_V8TH | HSNAND_CTL_CE_SEL_CS(ebu_host->cs_num) |
384 HSNAND_CTL_ENABLE_ECC | HSNAND_CTL_GO | val,
385 ebu_host->hsnand + HSNAND_CTL);
386}
387
388static int ebu_nand_read_page_hwecc(struct nand_chip *chip, u8 *buf,
389 int oob_required, int page)
390{
391 struct mtd_info *mtd = nand_to_mtd(chip);
392 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
393 int ret, reg_data;
394
395 ebu_nand_trigger(ebu_host, page, NAND_CMD_READ0);
396
397 ret = ebu_dma_start(ebu_host, DMA_DEV_TO_MEM, buf, mtd->writesize);
398 if (ret)
399 return ret;
400
401 if (oob_required)
402 chip->ecc.read_oob(chip, page);
403
404 reg_data = readl(ebu_host->hsnand + HSNAND_CTL);
405 reg_data &= ~HSNAND_CTL_GO;
406 writel(reg_data, ebu_host->hsnand + HSNAND_CTL);
407
408 return 0;
409}
410
411static int ebu_nand_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
412 int oob_required, int page)
413{
414 struct mtd_info *mtd = nand_to_mtd(chip);
415 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
416 void __iomem *int_sta = ebu_host->hsnand + HSNAND_INT_STA;
417 int reg_data, ret, val;
418 u32 reg;
419
420 ebu_nand_trigger(ebu_host, page, NAND_CMD_SEQIN);
421
422 ret = ebu_dma_start(ebu_host, DMA_MEM_TO_DEV, buf, mtd->writesize);
423 if (ret)
424 return ret;
425
426 if (oob_required) {
427 reg = get_unaligned_le32(chip->oob_poi);
428 writel(reg, ebu_host->hsnand + HSNAND_CMSG_0);
429
430 reg = get_unaligned_le32(chip->oob_poi + 4);
431 writel(reg, ebu_host->hsnand + HSNAND_CMSG_1);
432 }
433
434 ret = readl_poll_timeout_atomic(int_sta, val, !(val & HSNAND_INT_STA_WR_C),
435 10, 1000);
436 if (ret)
437 return ret;
438
439 reg_data = readl(ebu_host->hsnand + HSNAND_CTL);
440 reg_data &= ~HSNAND_CTL_GO;
441 writel(reg_data, ebu_host->hsnand + HSNAND_CTL);
442
443 return 0;
444}
445
446static const u8 ecc_strength[] = { 1, 1, 4, 8, 24, 32, 40, 60, };
447
448static int ebu_nand_attach_chip(struct nand_chip *chip)
449{
450 struct mtd_info *mtd = nand_to_mtd(chip);
451 struct ebu_nand_controller *ebu_host = nand_get_controller_data(chip);
452 u32 ecc_steps, ecc_bytes, ecc_total, pagesize, pg_per_blk;
453 u32 ecc_strength_ds = chip->ecc.strength;
454 u32 ecc_size = chip->ecc.size;
455 u32 writesize = mtd->writesize;
456 u32 blocksize = mtd->erasesize;
457 int bch_algo, start, val;
458
459
460 if (!chip->ecc.size)
461 chip->ecc.size = 512;
462
463 switch (ecc_size) {
464 case 512:
465 start = 1;
466 if (!ecc_strength_ds)
467 ecc_strength_ds = 4;
468 break;
469 case 1024:
470 start = 4;
471 if (!ecc_strength_ds)
472 ecc_strength_ds = 32;
473 break;
474 default:
475 return -EINVAL;
476 }
477
478
479 bch_algo = round_up(start + 1, 4);
480 for (val = start; val < bch_algo; val++) {
481 if (ecc_strength_ds == ecc_strength[val])
482 break;
483 }
484 if (val == bch_algo)
485 return -EINVAL;
486
487 if (ecc_strength_ds == 8)
488 ecc_bytes = 14;
489 else
490 ecc_bytes = DIV_ROUND_UP(ecc_strength_ds * fls(8 * ecc_size), 8);
491
492 ecc_steps = writesize / ecc_size;
493 ecc_total = ecc_steps * ecc_bytes;
494 if ((ecc_total + 8) > mtd->oobsize)
495 return -ERANGE;
496
497 chip->ecc.total = ecc_total;
498 pagesize = fls(writesize >> 11);
499 if (pagesize > HSNAND_PARA0_PAGE_V8192)
500 return -ERANGE;
501
502 pg_per_blk = fls((blocksize / writesize) >> 6) / 8;
503 if (pg_per_blk > HSNAND_PARA0_PIB_V256)
504 return -ERANGE;
505
506 ebu_host->nd_para0 = pagesize | pg_per_blk | HSNAND_PARA0_BYP_EN_NP |
507 HSNAND_PARA0_BYP_DEC_NP | HSNAND_PARA0_ADEP_EN |
508 HSNAND_PARA0_TYPE_ONFI | (val << 29);
509
510 mtd_set_ooblayout(mtd, &ebu_nand_ooblayout_ops);
511 chip->ecc.read_page = ebu_nand_read_page_hwecc;
512 chip->ecc.write_page = ebu_nand_write_page_hwecc;
513
514 return 0;
515}
516
517static int ebu_nand_exec_op(struct nand_chip *chip,
518 const struct nand_operation *op, bool check_only)
519{
520 const struct nand_op_instr *instr = NULL;
521 unsigned int op_id;
522 int i, timeout_ms, ret = 0;
523
524 if (check_only)
525 return 0;
526
527 ebu_select_chip(chip);
528 for (op_id = 0; op_id < op->ninstrs; op_id++) {
529 instr = &op->instrs[op_id];
530
531 switch (instr->type) {
532 case NAND_OP_CMD_INSTR:
533 ebu_nand_writeb(chip, HSNAND_CLE_OFFS | HSNAND_CS_OFFS,
534 instr->ctx.cmd.opcode);
535 break;
536
537 case NAND_OP_ADDR_INSTR:
538 for (i = 0; i < instr->ctx.addr.naddrs; i++)
539 ebu_nand_writeb(chip,
540 HSNAND_ALE_OFFS | HSNAND_CS_OFFS,
541 instr->ctx.addr.addrs[i]);
542 break;
543
544 case NAND_OP_DATA_IN_INSTR:
545 ebu_read_buf(chip, instr->ctx.data.buf.in,
546 instr->ctx.data.len);
547 break;
548
549 case NAND_OP_DATA_OUT_INSTR:
550 ebu_write_buf(chip, instr->ctx.data.buf.out,
551 instr->ctx.data.len);
552 break;
553
554 case NAND_OP_WAITRDY_INSTR:
555 timeout_ms = instr->ctx.waitrdy.timeout_ms * 1000;
556 ret = ebu_nand_waitrdy(chip, timeout_ms);
557 break;
558 }
559 }
560
561 return ret;
562}
563
564static const struct nand_controller_ops ebu_nand_controller_ops = {
565 .attach_chip = ebu_nand_attach_chip,
566 .setup_interface = ebu_nand_set_timings,
567 .exec_op = ebu_nand_exec_op,
568};
569
570static void ebu_dma_cleanup(struct ebu_nand_controller *ebu_host)
571{
572 if (ebu_host->dma_rx)
573 dma_release_channel(ebu_host->dma_rx);
574
575 if (ebu_host->dma_tx)
576 dma_release_channel(ebu_host->dma_tx);
577}
578
579static int ebu_nand_probe(struct platform_device *pdev)
580{
581 struct device *dev = &pdev->dev;
582 struct ebu_nand_controller *ebu_host;
583 struct nand_chip *nand;
584 struct mtd_info *mtd;
585 struct resource *res;
586 char *resname;
587 int ret;
588 u32 cs;
589
590 ebu_host = devm_kzalloc(dev, sizeof(*ebu_host), GFP_KERNEL);
591 if (!ebu_host)
592 return -ENOMEM;
593
594 ebu_host->dev = dev;
595 nand_controller_init(&ebu_host->controller);
596
597 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ebunand");
598 ebu_host->ebu = devm_ioremap_resource(&pdev->dev, res);
599 if (IS_ERR(ebu_host->ebu))
600 return PTR_ERR(ebu_host->ebu);
601
602 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsnand");
603 ebu_host->hsnand = devm_ioremap_resource(&pdev->dev, res);
604 if (IS_ERR(ebu_host->hsnand))
605 return PTR_ERR(ebu_host->hsnand);
606
607 ret = device_property_read_u32(dev, "reg", &cs);
608 if (ret) {
609 dev_err(dev, "failed to get chip select: %d\n", ret);
610 return ret;
611 }
612 if (cs >= MAX_CS) {
613 dev_err(dev, "got invalid chip select: %d\n", cs);
614 return -EINVAL;
615 }
616
617 ebu_host->cs_num = cs;
618
619 resname = devm_kasprintf(dev, GFP_KERNEL, "nand_cs%d", cs);
620 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, resname);
621 ebu_host->cs[cs].chipaddr = devm_ioremap_resource(dev, res);
622 ebu_host->cs[cs].nand_pa = res->start;
623 if (IS_ERR(ebu_host->cs[cs].chipaddr))
624 return PTR_ERR(ebu_host->cs[cs].chipaddr);
625
626 ebu_host->clk = devm_clk_get(dev, NULL);
627 if (IS_ERR(ebu_host->clk))
628 return dev_err_probe(dev, PTR_ERR(ebu_host->clk),
629 "failed to get clock\n");
630
631 ret = clk_prepare_enable(ebu_host->clk);
632 if (ret) {
633 dev_err(dev, "failed to enable clock: %d\n", ret);
634 return ret;
635 }
636 ebu_host->clk_rate = clk_get_rate(ebu_host->clk);
637
638 ebu_host->dma_tx = dma_request_chan(dev, "tx");
639 if (IS_ERR(ebu_host->dma_tx)) {
640 ret = dev_err_probe(dev, PTR_ERR(ebu_host->dma_tx),
641 "failed to request DMA tx chan!.\n");
642 goto err_disable_unprepare_clk;
643 }
644
645 ebu_host->dma_rx = dma_request_chan(dev, "rx");
646 if (IS_ERR(ebu_host->dma_rx)) {
647 ret = dev_err_probe(dev, PTR_ERR(ebu_host->dma_rx),
648 "failed to request DMA rx chan!.\n");
649 ebu_host->dma_rx = NULL;
650 goto err_cleanup_dma;
651 }
652
653 resname = devm_kasprintf(dev, GFP_KERNEL, "addr_sel%d", cs);
654 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, resname);
655 if (!res) {
656 ret = -EINVAL;
657 goto err_cleanup_dma;
658 }
659 ebu_host->cs[cs].addr_sel = res->start;
660 writel(ebu_host->cs[cs].addr_sel | EBU_ADDR_MASK(5) | EBU_ADDR_SEL_REGEN,
661 ebu_host->ebu + EBU_ADDR_SEL(cs));
662
663 nand_set_flash_node(&ebu_host->chip, dev->of_node);
664
665 mtd = nand_to_mtd(&ebu_host->chip);
666 if (!mtd->name) {
667 dev_err(ebu_host->dev, "NAND label property is mandatory\n");
668 ret = -EINVAL;
669 goto err_cleanup_dma;
670 }
671
672 mtd->dev.parent = dev;
673 ebu_host->dev = dev;
674
675 platform_set_drvdata(pdev, ebu_host);
676 nand_set_controller_data(&ebu_host->chip, ebu_host);
677
678 nand = &ebu_host->chip;
679 nand->controller = &ebu_host->controller;
680 nand->controller->ops = &ebu_nand_controller_ops;
681
682
683 ret = nand_scan(&ebu_host->chip, 1);
684 if (ret)
685 goto err_cleanup_dma;
686
687 ret = mtd_device_register(mtd, NULL, 0);
688 if (ret)
689 goto err_clean_nand;
690
691 return 0;
692
693err_clean_nand:
694 nand_cleanup(&ebu_host->chip);
695err_cleanup_dma:
696 ebu_dma_cleanup(ebu_host);
697err_disable_unprepare_clk:
698 clk_disable_unprepare(ebu_host->clk);
699
700 return ret;
701}
702
703static int ebu_nand_remove(struct platform_device *pdev)
704{
705 struct ebu_nand_controller *ebu_host = platform_get_drvdata(pdev);
706 int ret;
707
708 ret = mtd_device_unregister(nand_to_mtd(&ebu_host->chip));
709 WARN_ON(ret);
710 nand_cleanup(&ebu_host->chip);
711 ebu_nand_disable(&ebu_host->chip);
712 ebu_dma_cleanup(ebu_host);
713 clk_disable_unprepare(ebu_host->clk);
714
715 return 0;
716}
717
718static const struct of_device_id ebu_nand_match[] = {
719 { .compatible = "intel,nand-controller" },
720 { .compatible = "intel,lgm-ebunand" },
721 {}
722};
723MODULE_DEVICE_TABLE(of, ebu_nand_match);
724
725static struct platform_driver ebu_nand_driver = {
726 .probe = ebu_nand_probe,
727 .remove = ebu_nand_remove,
728 .driver = {
729 .name = "intel-nand-controller",
730 .of_match_table = ebu_nand_match,
731 },
732
733};
734module_platform_driver(ebu_nand_driver);
735
736MODULE_LICENSE("GPL v2");
737MODULE_AUTHOR("Vadivel Murugan R <vadivel.muruganx.ramuthevar@intel.com>");
738MODULE_DESCRIPTION("Intel's LGM External Bus NAND Controller driver");
739
