2 * NAND Flash Controller Device Driver
3 * Copyright © 2009-2010, Intel Corporation and its suppliers.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/wait.h>
23 #include <linux/mutex.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/module.h>
29 MODULE_LICENSE("GPL");
32 * We define a module parameter that allows the user to override
33 * the hardware and decide what timing mode should be used.
35 #define NAND_DEFAULT_TIMINGS -1
37 static int onfi_timing_mode = NAND_DEFAULT_TIMINGS;
38 module_param(onfi_timing_mode, int, S_IRUGO);
39 MODULE_PARM_DESC(onfi_timing_mode,
40 "Overrides default ONFI setting. -1 indicates use default timings");
42 #define DENALI_NAND_NAME "denali-nand"
45 * We define a macro here that combines all interrupts this driver uses into
46 * a single constant value, for convenience.
48 #define DENALI_IRQ_ALL (INTR__DMA_CMD_COMP | \
49 INTR__ECC_TRANSACTION_DONE | \
51 INTR__PROGRAM_FAIL | \
53 INTR__PROGRAM_COMP | \
60 * indicates whether or not the internal value for the flash bank is
63 #define CHIP_SELECT_INVALID -1
65 #define SUPPORT_8BITECC 1
68 * This macro divides two integers and rounds fractional values up
69 * to the nearest integer value.
71 #define CEIL_DIV(X, Y) (((X)%(Y)) ? ((X)/(Y)+1) : ((X)/(Y)))
74 * this macro allows us to convert from an MTD structure to our own
75 * device context (denali) structure.
77 static inline struct denali_nand_info *mtd_to_denali(struct mtd_info *mtd)
79 return container_of(mtd_to_nand(mtd), struct denali_nand_info, nand);
83 * These constants are defined by the driver to enable common driver
84 * configuration options.
86 #define SPARE_ACCESS 0x41
87 #define MAIN_ACCESS 0x42
88 #define MAIN_SPARE_ACCESS 0x43
89 #define PIPELINE_ACCESS 0x2000
92 #define DENALI_WRITE 0x100
95 * this is a helper macro that allows us to
96 * format the bank into the proper bits for the controller
98 #define BANK(x) ((x) << 24)
100 /* forward declarations */
101 static void clear_interrupts(struct denali_nand_info *denali);
102 static uint32_t wait_for_irq(struct denali_nand_info *denali,
104 static void denali_irq_enable(struct denali_nand_info *denali,
106 static uint32_t read_interrupt_status(struct denali_nand_info *denali);
109 * Certain operations for the denali NAND controller use an indexed mode to
110 * read/write data. The operation is performed by writing the address value
111 * of the command to the device memory followed by the data. This function
112 * abstracts this common operation.
114 static void index_addr(struct denali_nand_info *denali,
115 uint32_t address, uint32_t data)
117 iowrite32(address, denali->flash_mem);
118 iowrite32(data, denali->flash_mem + 0x10);
121 /* Perform an indexed read of the device */
122 static void index_addr_read_data(struct denali_nand_info *denali,
123 uint32_t address, uint32_t *pdata)
125 iowrite32(address, denali->flash_mem);
126 *pdata = ioread32(denali->flash_mem + 0x10);
130 * We need to buffer some data for some of the NAND core routines.
131 * The operations manage buffering that data.
133 static void reset_buf(struct denali_nand_info *denali)
135 denali->buf.head = denali->buf.tail = 0;
138 static void write_byte_to_buf(struct denali_nand_info *denali, uint8_t byte)
140 denali->buf.buf[denali->buf.tail++] = byte;
143 /* reads the status of the device */
144 static void read_status(struct denali_nand_info *denali)
148 /* initialize the data buffer to store status */
151 cmd = ioread32(denali->flash_reg + WRITE_PROTECT);
153 write_byte_to_buf(denali, NAND_STATUS_WP);
155 write_byte_to_buf(denali, 0);
158 /* resets a specific device connected to the core */
159 static void reset_bank(struct denali_nand_info *denali)
162 uint32_t irq_mask = INTR__RST_COMP | INTR__TIME_OUT;
164 clear_interrupts(denali);
166 iowrite32(1 << denali->flash_bank, denali->flash_reg + DEVICE_RESET);
168 irq_status = wait_for_irq(denali, irq_mask);
170 if (irq_status & INTR__TIME_OUT)
171 dev_err(denali->dev, "reset bank failed.\n");
174 /* Reset the flash controller */
175 static uint16_t denali_nand_reset(struct denali_nand_info *denali)
179 for (i = 0; i < denali->max_banks; i++)
180 iowrite32(INTR__RST_COMP | INTR__TIME_OUT,
181 denali->flash_reg + INTR_STATUS(i));
183 for (i = 0; i < denali->max_banks; i++) {
184 iowrite32(1 << i, denali->flash_reg + DEVICE_RESET);
185 while (!(ioread32(denali->flash_reg + INTR_STATUS(i)) &
186 (INTR__RST_COMP | INTR__TIME_OUT)))
188 if (ioread32(denali->flash_reg + INTR_STATUS(i)) &
191 "NAND Reset operation timed out on bank %d\n", i);
194 for (i = 0; i < denali->max_banks; i++)
195 iowrite32(INTR__RST_COMP | INTR__TIME_OUT,
196 denali->flash_reg + INTR_STATUS(i));
202 * this routine calculates the ONFI timing values for a given mode and
203 * programs the clocking register accordingly. The mode is determined by
204 * the get_onfi_nand_para routine.
206 static void nand_onfi_timing_set(struct denali_nand_info *denali,
209 uint16_t Trea[6] = {40, 30, 25, 20, 20, 16};
210 uint16_t Trp[6] = {50, 25, 17, 15, 12, 10};
211 uint16_t Treh[6] = {30, 15, 15, 10, 10, 7};
212 uint16_t Trc[6] = {100, 50, 35, 30, 25, 20};
213 uint16_t Trhoh[6] = {0, 15, 15, 15, 15, 15};
214 uint16_t Trloh[6] = {0, 0, 0, 0, 5, 5};
215 uint16_t Tcea[6] = {100, 45, 30, 25, 25, 25};
216 uint16_t Tadl[6] = {200, 100, 100, 100, 70, 70};
217 uint16_t Trhw[6] = {200, 100, 100, 100, 100, 100};
218 uint16_t Trhz[6] = {200, 100, 100, 100, 100, 100};
219 uint16_t Twhr[6] = {120, 80, 80, 60, 60, 60};
220 uint16_t Tcs[6] = {70, 35, 25, 25, 20, 15};
222 uint16_t data_invalid_rhoh, data_invalid_rloh, data_invalid;
223 uint16_t dv_window = 0;
224 uint16_t en_lo, en_hi;
226 uint16_t addr_2_data, re_2_we, re_2_re, we_2_re, cs_cnt;
228 en_lo = CEIL_DIV(Trp[mode], CLK_X);
229 en_hi = CEIL_DIV(Treh[mode], CLK_X);
231 if ((en_hi * CLK_X) < (Treh[mode] + 2))
235 if ((en_lo + en_hi) * CLK_X < Trc[mode])
236 en_lo += CEIL_DIV((Trc[mode] - (en_lo + en_hi) * CLK_X), CLK_X);
238 if ((en_lo + en_hi) < CLK_MULTI)
239 en_lo += CLK_MULTI - en_lo - en_hi;
241 while (dv_window < 8) {
242 data_invalid_rhoh = en_lo * CLK_X + Trhoh[mode];
244 data_invalid_rloh = (en_lo + en_hi) * CLK_X + Trloh[mode];
246 data_invalid = data_invalid_rhoh < data_invalid_rloh ?
247 data_invalid_rhoh : data_invalid_rloh;
249 dv_window = data_invalid - Trea[mode];
255 acc_clks = CEIL_DIV(Trea[mode], CLK_X);
257 while (acc_clks * CLK_X - Trea[mode] < 3)
260 if (data_invalid - acc_clks * CLK_X < 2)
261 dev_warn(denali->dev, "%s, Line %d: Warning!\n",
264 addr_2_data = CEIL_DIV(Tadl[mode], CLK_X);
265 re_2_we = CEIL_DIV(Trhw[mode], CLK_X);
266 re_2_re = CEIL_DIV(Trhz[mode], CLK_X);
267 we_2_re = CEIL_DIV(Twhr[mode], CLK_X);
268 cs_cnt = CEIL_DIV((Tcs[mode] - Trp[mode]), CLK_X);
273 while (cs_cnt * CLK_X + Trea[mode] < Tcea[mode])
282 /* Sighting 3462430: Temporary hack for MT29F128G08CJABAWP:B */
283 if (ioread32(denali->flash_reg + MANUFACTURER_ID) == 0 &&
284 ioread32(denali->flash_reg + DEVICE_ID) == 0x88)
287 iowrite32(acc_clks, denali->flash_reg + ACC_CLKS);
288 iowrite32(re_2_we, denali->flash_reg + RE_2_WE);
289 iowrite32(re_2_re, denali->flash_reg + RE_2_RE);
290 iowrite32(we_2_re, denali->flash_reg + WE_2_RE);
291 iowrite32(addr_2_data, denali->flash_reg + ADDR_2_DATA);
292 iowrite32(en_lo, denali->flash_reg + RDWR_EN_LO_CNT);
293 iowrite32(en_hi, denali->flash_reg + RDWR_EN_HI_CNT);
294 iowrite32(cs_cnt, denali->flash_reg + CS_SETUP_CNT);
297 /* queries the NAND device to see what ONFI modes it supports. */
298 static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
303 * we needn't to do a reset here because driver has already
304 * reset all the banks before
306 if (!(ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
307 ONFI_TIMING_MODE__VALUE))
310 for (i = 5; i > 0; i--) {
311 if (ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
316 nand_onfi_timing_set(denali, i);
319 * By now, all the ONFI devices we know support the page cache
320 * rw feature. So here we enable the pipeline_rw_ahead feature
322 /* iowrite32(1, denali->flash_reg + CACHE_WRITE_ENABLE); */
323 /* iowrite32(1, denali->flash_reg + CACHE_READ_ENABLE); */
328 static void get_samsung_nand_para(struct denali_nand_info *denali,
331 if (device_id == 0xd3) { /* Samsung K9WAG08U1A */
332 /* Set timing register values according to datasheet */
333 iowrite32(5, denali->flash_reg + ACC_CLKS);
334 iowrite32(20, denali->flash_reg + RE_2_WE);
335 iowrite32(12, denali->flash_reg + WE_2_RE);
336 iowrite32(14, denali->flash_reg + ADDR_2_DATA);
337 iowrite32(3, denali->flash_reg + RDWR_EN_LO_CNT);
338 iowrite32(2, denali->flash_reg + RDWR_EN_HI_CNT);
339 iowrite32(2, denali->flash_reg + CS_SETUP_CNT);
343 static void get_toshiba_nand_para(struct denali_nand_info *denali)
348 * Workaround to fix a controller bug which reports a wrong
349 * spare area size for some kind of Toshiba NAND device
351 if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) &&
352 (ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) {
353 iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
354 tmp = ioread32(denali->flash_reg + DEVICES_CONNECTED) *
355 ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
357 denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
359 iowrite32(15, denali->flash_reg + ECC_CORRECTION);
360 #elif SUPPORT_8BITECC
361 iowrite32(8, denali->flash_reg + ECC_CORRECTION);
366 static void get_hynix_nand_para(struct denali_nand_info *denali,
369 uint32_t main_size, spare_size;
372 case 0xD5: /* Hynix H27UAG8T2A, H27UBG8U5A or H27UCG8VFA */
373 case 0xD7: /* Hynix H27UDG8VEM, H27UCG8UDM or H27UCG8V5A */
374 iowrite32(128, denali->flash_reg + PAGES_PER_BLOCK);
375 iowrite32(4096, denali->flash_reg + DEVICE_MAIN_AREA_SIZE);
376 iowrite32(224, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
378 ioread32(denali->flash_reg + DEVICES_CONNECTED);
380 ioread32(denali->flash_reg + DEVICES_CONNECTED);
382 denali->flash_reg + LOGICAL_PAGE_DATA_SIZE);
383 iowrite32(spare_size,
384 denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
385 iowrite32(0, denali->flash_reg + DEVICE_WIDTH);
387 iowrite32(15, denali->flash_reg + ECC_CORRECTION);
388 #elif SUPPORT_8BITECC
389 iowrite32(8, denali->flash_reg + ECC_CORRECTION);
393 dev_warn(denali->dev,
394 "Unknown Hynix NAND (Device ID: 0x%x).\n"
395 "Will use default parameter values instead.\n",
401 * determines how many NAND chips are connected to the controller. Note for
402 * Intel CE4100 devices we don't support more than one device.
404 static void find_valid_banks(struct denali_nand_info *denali)
406 uint32_t id[denali->max_banks];
409 denali->total_used_banks = 1;
410 for (i = 0; i < denali->max_banks; i++) {
411 index_addr(denali, MODE_11 | (i << 24) | 0, 0x90);
412 index_addr(denali, MODE_11 | (i << 24) | 1, 0);
413 index_addr_read_data(denali, MODE_11 | (i << 24) | 2, &id[i]);
416 "Return 1st ID for bank[%d]: %x\n", i, id[i]);
419 if (!(id[i] & 0x0ff))
422 if ((id[i] & 0x0ff) == (id[0] & 0x0ff))
423 denali->total_used_banks++;
429 if (denali->platform == INTEL_CE4100) {
431 * Platform limitations of the CE4100 device limit
432 * users to a single chip solution for NAND.
433 * Multichip support is not enabled.
435 if (denali->total_used_banks != 1) {
437 "Sorry, Intel CE4100 only supports a single NAND device.\n");
442 "denali->total_used_banks: %d\n", denali->total_used_banks);
446 * Use the configuration feature register to determine the maximum number of
447 * banks that the hardware supports.
449 static void detect_max_banks(struct denali_nand_info *denali)
451 uint32_t features = ioread32(denali->flash_reg + FEATURES);
453 * Read the revision register, so we can calculate the max_banks
454 * properly: the encoding changed from rev 5.0 to 5.1
456 u32 revision = MAKE_COMPARABLE_REVISION(
457 ioread32(denali->flash_reg + REVISION));
459 if (revision < REVISION_5_1)
460 denali->max_banks = 2 << (features & FEATURES__N_BANKS);
462 denali->max_banks = 1 << (features & FEATURES__N_BANKS);
465 static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
467 uint16_t status = PASS;
468 uint32_t id_bytes[8], addr;
469 uint8_t maf_id, device_id;
473 * Use read id method to get device ID and other params.
474 * For some NAND chips, controller can't report the correct
475 * device ID by reading from DEVICE_ID register
477 addr = MODE_11 | BANK(denali->flash_bank);
478 index_addr(denali, addr | 0, 0x90);
479 index_addr(denali, addr | 1, 0);
480 for (i = 0; i < 8; i++)
481 index_addr_read_data(denali, addr | 2, &id_bytes[i]);
482 maf_id = id_bytes[0];
483 device_id = id_bytes[1];
485 if (ioread32(denali->flash_reg + ONFI_DEVICE_NO_OF_LUNS) &
486 ONFI_DEVICE_NO_OF_LUNS__ONFI_DEVICE) { /* ONFI 1.0 NAND */
487 if (FAIL == get_onfi_nand_para(denali))
489 } else if (maf_id == 0xEC) { /* Samsung NAND */
490 get_samsung_nand_para(denali, device_id);
491 } else if (maf_id == 0x98) { /* Toshiba NAND */
492 get_toshiba_nand_para(denali);
493 } else if (maf_id == 0xAD) { /* Hynix NAND */
494 get_hynix_nand_para(denali, device_id);
497 dev_info(denali->dev,
498 "Dump timing register values:\n"
499 "acc_clks: %d, re_2_we: %d, re_2_re: %d\n"
500 "we_2_re: %d, addr_2_data: %d, rdwr_en_lo_cnt: %d\n"
501 "rdwr_en_hi_cnt: %d, cs_setup_cnt: %d\n",
502 ioread32(denali->flash_reg + ACC_CLKS),
503 ioread32(denali->flash_reg + RE_2_WE),
504 ioread32(denali->flash_reg + RE_2_RE),
505 ioread32(denali->flash_reg + WE_2_RE),
506 ioread32(denali->flash_reg + ADDR_2_DATA),
507 ioread32(denali->flash_reg + RDWR_EN_LO_CNT),
508 ioread32(denali->flash_reg + RDWR_EN_HI_CNT),
509 ioread32(denali->flash_reg + CS_SETUP_CNT));
511 find_valid_banks(denali);
514 * If the user specified to override the default timings
515 * with a specific ONFI mode, we apply those changes here.
517 if (onfi_timing_mode != NAND_DEFAULT_TIMINGS)
518 nand_onfi_timing_set(denali, onfi_timing_mode);
523 static void denali_set_intr_modes(struct denali_nand_info *denali,
527 iowrite32(1, denali->flash_reg + GLOBAL_INT_ENABLE);
529 iowrite32(0, denali->flash_reg + GLOBAL_INT_ENABLE);
533 * validation function to verify that the controlling software is making
536 static inline bool is_flash_bank_valid(int flash_bank)
538 return flash_bank >= 0 && flash_bank < 4;
541 static void denali_irq_init(struct denali_nand_info *denali)
546 /* Disable global interrupts */
547 denali_set_intr_modes(denali, false);
549 int_mask = DENALI_IRQ_ALL;
551 /* Clear all status bits */
552 for (i = 0; i < denali->max_banks; ++i)
553 iowrite32(0xFFFF, denali->flash_reg + INTR_STATUS(i));
555 denali_irq_enable(denali, int_mask);
558 static void denali_irq_cleanup(int irqnum, struct denali_nand_info *denali)
560 denali_set_intr_modes(denali, false);
563 static void denali_irq_enable(struct denali_nand_info *denali,
568 for (i = 0; i < denali->max_banks; ++i)
569 iowrite32(int_mask, denali->flash_reg + INTR_EN(i));
573 * This function only returns when an interrupt that this driver cares about
574 * occurs. This is to reduce the overhead of servicing interrupts
576 static inline uint32_t denali_irq_detected(struct denali_nand_info *denali)
578 return read_interrupt_status(denali) & DENALI_IRQ_ALL;
581 /* Interrupts are cleared by writing a 1 to the appropriate status bit */
582 static inline void clear_interrupt(struct denali_nand_info *denali,
585 uint32_t intr_status_reg;
587 intr_status_reg = INTR_STATUS(denali->flash_bank);
589 iowrite32(irq_mask, denali->flash_reg + intr_status_reg);
592 static void clear_interrupts(struct denali_nand_info *denali)
596 spin_lock_irq(&denali->irq_lock);
598 status = read_interrupt_status(denali);
599 clear_interrupt(denali, status);
601 denali->irq_status = 0x0;
602 spin_unlock_irq(&denali->irq_lock);
605 static uint32_t read_interrupt_status(struct denali_nand_info *denali)
607 uint32_t intr_status_reg;
609 intr_status_reg = INTR_STATUS(denali->flash_bank);
611 return ioread32(denali->flash_reg + intr_status_reg);
615 * This is the interrupt service routine. It handles all interrupts
616 * sent to this device. Note that on CE4100, this is a shared interrupt.
618 static irqreturn_t denali_isr(int irq, void *dev_id)
620 struct denali_nand_info *denali = dev_id;
622 irqreturn_t result = IRQ_NONE;
624 spin_lock(&denali->irq_lock);
626 /* check to see if a valid NAND chip has been selected. */
627 if (is_flash_bank_valid(denali->flash_bank)) {
629 * check to see if controller generated the interrupt,
630 * since this is a shared interrupt
632 irq_status = denali_irq_detected(denali);
633 if (irq_status != 0) {
634 /* handle interrupt */
635 /* first acknowledge it */
636 clear_interrupt(denali, irq_status);
638 * store the status in the device context for someone
641 denali->irq_status |= irq_status;
642 /* notify anyone who cares that it happened */
643 complete(&denali->complete);
644 /* tell the OS that we've handled this */
645 result = IRQ_HANDLED;
648 spin_unlock(&denali->irq_lock);
652 static uint32_t wait_for_irq(struct denali_nand_info *denali, uint32_t irq_mask)
654 unsigned long comp_res;
655 uint32_t intr_status;
656 unsigned long timeout = msecs_to_jiffies(1000);
660 wait_for_completion_timeout(&denali->complete, timeout);
661 spin_lock_irq(&denali->irq_lock);
662 intr_status = denali->irq_status;
664 if (intr_status & irq_mask) {
665 denali->irq_status &= ~irq_mask;
666 spin_unlock_irq(&denali->irq_lock);
667 /* our interrupt was detected */
672 * these are not the interrupts you are looking for -
675 spin_unlock_irq(&denali->irq_lock);
676 } while (comp_res != 0);
680 pr_err("timeout occurred, status = 0x%x, mask = 0x%x\n",
681 intr_status, irq_mask);
689 * This helper function setups the registers for ECC and whether or not
690 * the spare area will be transferred.
692 static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en,
695 int ecc_en_flag, transfer_spare_flag;
697 /* set ECC, transfer spare bits if needed */
698 ecc_en_flag = ecc_en ? ECC_ENABLE__FLAG : 0;
699 transfer_spare_flag = transfer_spare ? TRANSFER_SPARE_REG__FLAG : 0;
701 /* Enable spare area/ECC per user's request. */
702 iowrite32(ecc_en_flag, denali->flash_reg + ECC_ENABLE);
703 iowrite32(transfer_spare_flag, denali->flash_reg + TRANSFER_SPARE_REG);
707 * sends a pipeline command operation to the controller. See the Denali NAND
708 * controller's user guide for more information (section 4.2.3.6).
710 static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
711 bool ecc_en, bool transfer_spare,
712 int access_type, int op)
715 uint32_t page_count = 1;
716 uint32_t addr, cmd, irq_status, irq_mask;
718 if (op == DENALI_READ)
719 irq_mask = INTR__LOAD_COMP;
720 else if (op == DENALI_WRITE)
725 setup_ecc_for_xfer(denali, ecc_en, transfer_spare);
727 clear_interrupts(denali);
729 addr = BANK(denali->flash_bank) | denali->page;
731 if (op == DENALI_WRITE && access_type != SPARE_ACCESS) {
732 cmd = MODE_01 | addr;
733 iowrite32(cmd, denali->flash_mem);
734 } else if (op == DENALI_WRITE && access_type == SPARE_ACCESS) {
735 /* read spare area */
736 cmd = MODE_10 | addr;
737 index_addr(denali, cmd, access_type);
739 cmd = MODE_01 | addr;
740 iowrite32(cmd, denali->flash_mem);
741 } else if (op == DENALI_READ) {
742 /* setup page read request for access type */
743 cmd = MODE_10 | addr;
744 index_addr(denali, cmd, access_type);
747 * page 33 of the NAND controller spec indicates we should not
748 * use the pipeline commands in Spare area only mode.
751 if (access_type == SPARE_ACCESS) {
752 cmd = MODE_01 | addr;
753 iowrite32(cmd, denali->flash_mem);
755 index_addr(denali, cmd,
756 PIPELINE_ACCESS | op | page_count);
759 * wait for command to be accepted
760 * can always use status0 bit as the
761 * mask is identical for each bank.
763 irq_status = wait_for_irq(denali, irq_mask);
765 if (irq_status == 0) {
767 "cmd, page, addr on timeout (0x%x, 0x%x, 0x%x)\n",
768 cmd, denali->page, addr);
771 cmd = MODE_01 | addr;
772 iowrite32(cmd, denali->flash_mem);
779 /* helper function that simply writes a buffer to the flash */
780 static int write_data_to_flash_mem(struct denali_nand_info *denali,
781 const uint8_t *buf, int len)
787 * verify that the len is a multiple of 4.
788 * see comment in read_data_from_flash_mem()
790 BUG_ON((len % 4) != 0);
792 /* write the data to the flash memory */
793 buf32 = (uint32_t *)buf;
794 for (i = 0; i < len / 4; i++)
795 iowrite32(*buf32++, denali->flash_mem + 0x10);
796 return i * 4; /* intent is to return the number of bytes read */
799 /* helper function that simply reads a buffer from the flash */
800 static int read_data_from_flash_mem(struct denali_nand_info *denali,
801 uint8_t *buf, int len)
807 * we assume that len will be a multiple of 4, if not it would be nice
808 * to know about it ASAP rather than have random failures...
809 * This assumption is based on the fact that this function is designed
810 * to be used to read flash pages, which are typically multiples of 4.
812 BUG_ON((len % 4) != 0);
814 /* transfer the data from the flash */
815 buf32 = (uint32_t *)buf;
816 for (i = 0; i < len / 4; i++)
817 *buf32++ = ioread32(denali->flash_mem + 0x10);
818 return i * 4; /* intent is to return the number of bytes read */
821 /* writes OOB data to the device */
822 static int write_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
824 struct denali_nand_info *denali = mtd_to_denali(mtd);
826 uint32_t irq_mask = INTR__PROGRAM_COMP | INTR__PROGRAM_FAIL;
831 if (denali_send_pipeline_cmd(denali, false, false, SPARE_ACCESS,
832 DENALI_WRITE) == PASS) {
833 write_data_to_flash_mem(denali, buf, mtd->oobsize);
835 /* wait for operation to complete */
836 irq_status = wait_for_irq(denali, irq_mask);
838 if (irq_status == 0) {
839 dev_err(denali->dev, "OOB write failed\n");
843 dev_err(denali->dev, "unable to send pipeline command\n");
849 /* reads OOB data from the device */
850 static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
852 struct denali_nand_info *denali = mtd_to_denali(mtd);
853 uint32_t irq_mask = INTR__LOAD_COMP;
854 uint32_t irq_status, addr, cmd;
858 if (denali_send_pipeline_cmd(denali, false, true, SPARE_ACCESS,
859 DENALI_READ) == PASS) {
860 read_data_from_flash_mem(denali, buf, mtd->oobsize);
863 * wait for command to be accepted
864 * can always use status0 bit as the
865 * mask is identical for each bank.
867 irq_status = wait_for_irq(denali, irq_mask);
870 dev_err(denali->dev, "page on OOB timeout %d\n",
874 * We set the device back to MAIN_ACCESS here as I observed
875 * instability with the controller if you do a block erase
876 * and the last transaction was a SPARE_ACCESS. Block erase
877 * is reliable (according to the MTD test infrastructure)
878 * if you are in MAIN_ACCESS.
880 addr = BANK(denali->flash_bank) | denali->page;
881 cmd = MODE_10 | addr;
882 index_addr(denali, cmd, MAIN_ACCESS);
887 * this function examines buffers to see if they contain data that
888 * indicate that the buffer is part of an erased region of flash.
890 static bool is_erased(uint8_t *buf, int len)
894 for (i = 0; i < len; i++)
899 #define ECC_SECTOR_SIZE 512
901 #define ECC_SECTOR(x) (((x) & ECC_ERROR_ADDRESS__SECTOR_NR) >> 12)
902 #define ECC_BYTE(x) (((x) & ECC_ERROR_ADDRESS__OFFSET))
903 #define ECC_CORRECTION_VALUE(x) ((x) & ERR_CORRECTION_INFO__BYTEMASK)
904 #define ECC_ERROR_CORRECTABLE(x) (!((x) & ERR_CORRECTION_INFO__ERROR_TYPE))
905 #define ECC_ERR_DEVICE(x) (((x) & ERR_CORRECTION_INFO__DEVICE_NR) >> 8)
906 #define ECC_LAST_ERR(x) ((x) & ERR_CORRECTION_INFO__LAST_ERR_INFO)
908 static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
909 uint32_t irq_status, unsigned int *max_bitflips)
911 bool check_erased_page = false;
912 unsigned int bitflips = 0;
914 if (irq_status & INTR__ECC_ERR) {
915 /* read the ECC errors. we'll ignore them for now */
916 uint32_t err_address, err_correction_info, err_byte,
917 err_sector, err_device, err_correction_value;
918 denali_set_intr_modes(denali, false);
921 err_address = ioread32(denali->flash_reg +
923 err_sector = ECC_SECTOR(err_address);
924 err_byte = ECC_BYTE(err_address);
926 err_correction_info = ioread32(denali->flash_reg +
927 ERR_CORRECTION_INFO);
928 err_correction_value =
929 ECC_CORRECTION_VALUE(err_correction_info);
930 err_device = ECC_ERR_DEVICE(err_correction_info);
932 if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
934 * If err_byte is larger than ECC_SECTOR_SIZE,
935 * means error happened in OOB, so we ignore
936 * it. It's no need for us to correct it
937 * err_device is represented the NAND error
938 * bits are happened in if there are more
939 * than one NAND connected.
941 if (err_byte < ECC_SECTOR_SIZE) {
942 struct mtd_info *mtd =
943 nand_to_mtd(&denali->nand);
946 offset = (err_sector *
951 /* correct the ECC error */
952 buf[offset] ^= err_correction_value;
953 mtd->ecc_stats.corrected++;
958 * if the error is not correctable, need to
959 * look at the page to see if it is an erased
960 * page. if so, then it's not a real ECC error
962 check_erased_page = true;
964 } while (!ECC_LAST_ERR(err_correction_info));
966 * Once handle all ecc errors, controller will triger
967 * a ECC_TRANSACTION_DONE interrupt, so here just wait
968 * for a while for this interrupt
970 while (!(read_interrupt_status(denali) &
971 INTR__ECC_TRANSACTION_DONE))
973 clear_interrupts(denali);
974 denali_set_intr_modes(denali, true);
976 *max_bitflips = bitflips;
977 return check_erased_page;
980 /* programs the controller to either enable/disable DMA transfers */
981 static void denali_enable_dma(struct denali_nand_info *denali, bool en)
983 iowrite32(en ? DMA_ENABLE__FLAG : 0, denali->flash_reg + DMA_ENABLE);
984 ioread32(denali->flash_reg + DMA_ENABLE);
987 /* setups the HW to perform the data DMA */
988 static void denali_setup_dma(struct denali_nand_info *denali, int op)
991 const int page_count = 1;
992 uint32_t addr = denali->buf.dma_buf;
994 mode = MODE_10 | BANK(denali->flash_bank);
996 /* DMA is a four step process */
998 /* 1. setup transfer type and # of pages */
999 index_addr(denali, mode | denali->page, 0x2000 | op | page_count);
1001 /* 2. set memory high address bits 23:8 */
1002 index_addr(denali, mode | ((addr >> 16) << 8), 0x2200);
1004 /* 3. set memory low address bits 23:8 */
1005 index_addr(denali, mode | ((addr & 0xffff) << 8), 0x2300);
1007 /* 4. interrupt when complete, burst len = 64 bytes */
1008 index_addr(denali, mode | 0x14000, 0x2400);
1012 * writes a page. user specifies type, and this function handles the
1013 * configuration details.
1015 static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
1016 const uint8_t *buf, bool raw_xfer)
1018 struct denali_nand_info *denali = mtd_to_denali(mtd);
1019 dma_addr_t addr = denali->buf.dma_buf;
1020 size_t size = mtd->writesize + mtd->oobsize;
1021 uint32_t irq_status;
1022 uint32_t irq_mask = INTR__DMA_CMD_COMP | INTR__PROGRAM_FAIL;
1025 * if it is a raw xfer, we want to disable ecc and send the spare area.
1026 * !raw_xfer - enable ecc
1027 * raw_xfer - transfer spare
1029 setup_ecc_for_xfer(denali, !raw_xfer, raw_xfer);
1031 /* copy buffer into DMA buffer */
1032 memcpy(denali->buf.buf, buf, mtd->writesize);
1035 /* transfer the data to the spare area */
1036 memcpy(denali->buf.buf + mtd->writesize,
1041 dma_sync_single_for_device(denali->dev, addr, size, DMA_TO_DEVICE);
1043 clear_interrupts(denali);
1044 denali_enable_dma(denali, true);
1046 denali_setup_dma(denali, DENALI_WRITE);
1048 /* wait for operation to complete */
1049 irq_status = wait_for_irq(denali, irq_mask);
1051 if (irq_status == 0) {
1052 dev_err(denali->dev, "timeout on write_page (type = %d)\n",
1054 denali->status = NAND_STATUS_FAIL;
1057 denali_enable_dma(denali, false);
1058 dma_sync_single_for_cpu(denali->dev, addr, size, DMA_TO_DEVICE);
1063 /* NAND core entry points */
1066 * this is the callback that the NAND core calls to write a page. Since
1067 * writing a page with ECC or without is similar, all the work is done
1068 * by write_page above.
1070 static int denali_write_page(struct mtd_info *mtd, struct nand_chip *chip,
1071 const uint8_t *buf, int oob_required, int page)
1074 * for regular page writes, we let HW handle all the ECC
1075 * data written to the device.
1077 return write_page(mtd, chip, buf, false);
1081 * This is the callback that the NAND core calls to write a page without ECC.
1082 * raw access is similar to ECC page writes, so all the work is done in the
1083 * write_page() function above.
1085 static int denali_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
1086 const uint8_t *buf, int oob_required,
1090 * for raw page writes, we want to disable ECC and simply write
1091 * whatever data is in the buffer.
1093 return write_page(mtd, chip, buf, true);
1096 static int denali_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
1099 return write_oob_data(mtd, chip->oob_poi, page);
1102 static int denali_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
1105 read_oob_data(mtd, chip->oob_poi, page);
1110 static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
1111 uint8_t *buf, int oob_required, int page)
1113 unsigned int max_bitflips;
1114 struct denali_nand_info *denali = mtd_to_denali(mtd);
1116 dma_addr_t addr = denali->buf.dma_buf;
1117 size_t size = mtd->writesize + mtd->oobsize;
1119 uint32_t irq_status;
1120 uint32_t irq_mask = INTR__ECC_TRANSACTION_DONE | INTR__ECC_ERR;
1121 bool check_erased_page = false;
1123 if (page != denali->page) {
1124 dev_err(denali->dev,
1125 "IN %s: page %d is not equal to denali->page %d",
1126 __func__, page, denali->page);
1130 setup_ecc_for_xfer(denali, true, false);
1132 denali_enable_dma(denali, true);
1133 dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);
1135 clear_interrupts(denali);
1136 denali_setup_dma(denali, DENALI_READ);
1138 /* wait for operation to complete */
1139 irq_status = wait_for_irq(denali, irq_mask);
1141 dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);
1143 memcpy(buf, denali->buf.buf, mtd->writesize);
1145 check_erased_page = handle_ecc(denali, buf, irq_status, &max_bitflips);
1146 denali_enable_dma(denali, false);
1148 if (check_erased_page) {
1149 read_oob_data(mtd, chip->oob_poi, denali->page);
1151 /* check ECC failures that may have occurred on erased pages */
1152 if (check_erased_page) {
1153 if (!is_erased(buf, mtd->writesize))
1154 mtd->ecc_stats.failed++;
1155 if (!is_erased(buf, mtd->oobsize))
1156 mtd->ecc_stats.failed++;
1159 return max_bitflips;
1162 static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
1163 uint8_t *buf, int oob_required, int page)
1165 struct denali_nand_info *denali = mtd_to_denali(mtd);
1166 dma_addr_t addr = denali->buf.dma_buf;
1167 size_t size = mtd->writesize + mtd->oobsize;
1168 uint32_t irq_mask = INTR__DMA_CMD_COMP;
1170 if (page != denali->page) {
1171 dev_err(denali->dev,
1172 "IN %s: page %d is not equal to denali->page %d",
1173 __func__, page, denali->page);
1177 setup_ecc_for_xfer(denali, false, true);
1178 denali_enable_dma(denali, true);
1180 dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);
1182 clear_interrupts(denali);
1183 denali_setup_dma(denali, DENALI_READ);
1185 /* wait for operation to complete */
1186 wait_for_irq(denali, irq_mask);
1188 dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);
1190 denali_enable_dma(denali, false);
1192 memcpy(buf, denali->buf.buf, mtd->writesize);
1193 memcpy(chip->oob_poi, denali->buf.buf + mtd->writesize, mtd->oobsize);
1198 static uint8_t denali_read_byte(struct mtd_info *mtd)
1200 struct denali_nand_info *denali = mtd_to_denali(mtd);
1201 uint8_t result = 0xff;
1203 if (denali->buf.head < denali->buf.tail)
1204 result = denali->buf.buf[denali->buf.head++];
1209 static void denali_select_chip(struct mtd_info *mtd, int chip)
1211 struct denali_nand_info *denali = mtd_to_denali(mtd);
1213 spin_lock_irq(&denali->irq_lock);
1214 denali->flash_bank = chip;
1215 spin_unlock_irq(&denali->irq_lock);
1218 static int denali_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
1220 struct denali_nand_info *denali = mtd_to_denali(mtd);
1221 int status = denali->status;
1228 static int denali_erase(struct mtd_info *mtd, int page)
1230 struct denali_nand_info *denali = mtd_to_denali(mtd);
1232 uint32_t cmd, irq_status;
1234 clear_interrupts(denali);
1236 /* setup page read request for access type */
1237 cmd = MODE_10 | BANK(denali->flash_bank) | page;
1238 index_addr(denali, cmd, 0x1);
1240 /* wait for erase to complete or failure to occur */
1241 irq_status = wait_for_irq(denali, INTR__ERASE_COMP | INTR__ERASE_FAIL);
1243 return irq_status & INTR__ERASE_FAIL ? NAND_STATUS_FAIL : PASS;
1246 static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
1249 struct denali_nand_info *denali = mtd_to_denali(mtd);
1254 case NAND_CMD_PAGEPROG:
1256 case NAND_CMD_STATUS:
1257 read_status(denali);
1259 case NAND_CMD_READID:
1260 case NAND_CMD_PARAM:
1263 * sometimes ManufactureId read from register is not right
1264 * e.g. some of Micron MT29F32G08QAA MLC NAND chips
1265 * So here we send READID cmd to NAND insteand
1267 addr = MODE_11 | BANK(denali->flash_bank);
1268 index_addr(denali, addr | 0, 0x90);
1269 index_addr(denali, addr | 1, col);
1270 for (i = 0; i < 8; i++) {
1271 index_addr_read_data(denali, addr | 2, &id);
1272 write_byte_to_buf(denali, id);
1275 case NAND_CMD_READ0:
1276 case NAND_CMD_SEQIN:
1277 denali->page = page;
1279 case NAND_CMD_RESET:
1282 case NAND_CMD_READOOB:
1283 /* TODO: Read OOB data */
1286 pr_err(": unsupported command received 0x%x\n", cmd);
1290 /* end NAND core entry points */
1292 /* Initialization code to bring the device up to a known good state */
1293 static void denali_hw_init(struct denali_nand_info *denali)
1296 * tell driver how many bit controller will skip before
1297 * writing ECC code in OOB, this register may be already
1298 * set by firmware. So we read this value out.
1299 * if this value is 0, just let it be.
1301 denali->bbtskipbytes = ioread32(denali->flash_reg +
1302 SPARE_AREA_SKIP_BYTES);
1303 detect_max_banks(denali);
1304 denali_nand_reset(denali);
1305 iowrite32(0x0F, denali->flash_reg + RB_PIN_ENABLED);
1306 iowrite32(CHIP_EN_DONT_CARE__FLAG,
1307 denali->flash_reg + CHIP_ENABLE_DONT_CARE);
1309 iowrite32(0xffff, denali->flash_reg + SPARE_AREA_MARKER);
1311 /* Should set value for these registers when init */
1312 iowrite32(0, denali->flash_reg + TWO_ROW_ADDR_CYCLES);
1313 iowrite32(1, denali->flash_reg + ECC_ENABLE);
1314 denali_nand_timing_set(denali);
1315 denali_irq_init(denali);
1319 * Althogh controller spec said SLC ECC is forceb to be 4bit,
1320 * but denali controller in MRST only support 15bit and 8bit ECC
1323 #define ECC_8BITS 14
1324 #define ECC_15BITS 26
1326 static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
1327 struct mtd_oob_region *oobregion)
1329 struct denali_nand_info *denali = mtd_to_denali(mtd);
1330 struct nand_chip *chip = mtd_to_nand(mtd);
1335 oobregion->offset = denali->bbtskipbytes;
1336 oobregion->length = chip->ecc.total;
1341 static int denali_ooblayout_free(struct mtd_info *mtd, int section,
1342 struct mtd_oob_region *oobregion)
1344 struct denali_nand_info *denali = mtd_to_denali(mtd);
1345 struct nand_chip *chip = mtd_to_nand(mtd);
1350 oobregion->offset = chip->ecc.total + denali->bbtskipbytes;
1351 oobregion->length = mtd->oobsize - oobregion->offset;
1356 static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
1357 .ecc = denali_ooblayout_ecc,
1358 .free = denali_ooblayout_free,
1361 static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
1362 static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
1364 static struct nand_bbt_descr bbt_main_descr = {
1365 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
1366 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
1371 .pattern = bbt_pattern,
1374 static struct nand_bbt_descr bbt_mirror_descr = {
1375 .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
1376 | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
1381 .pattern = mirror_pattern,
1384 /* initialize driver data structures */
1385 static void denali_drv_init(struct denali_nand_info *denali)
1388 * the completion object will be used to notify
1389 * the callee that the interrupt is done
1391 init_completion(&denali->complete);
1394 * the spinlock will be used to synchronize the ISR with any
1395 * element that might be access shared data (interrupt status)
1397 spin_lock_init(&denali->irq_lock);
1399 /* indicate that MTD has not selected a valid bank yet */
1400 denali->flash_bank = CHIP_SELECT_INVALID;
1402 /* initialize our irq_status variable to indicate no interrupts */
1403 denali->irq_status = 0;
1406 static int denali_multidev_fixup(struct denali_nand_info *denali)
1408 struct nand_chip *chip = &denali->nand;
1409 struct mtd_info *mtd = nand_to_mtd(chip);
1412 * Support for multi device:
1413 * When the IP configuration is x16 capable and two x8 chips are
1414 * connected in parallel, DEVICES_CONNECTED should be set to 2.
1415 * In this case, the core framework knows nothing about this fact,
1416 * so we should tell it the _logical_ pagesize and anything necessary.
1418 denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
1421 * On some SoCs, DEVICES_CONNECTED is not auto-detected.
1422 * For those, DEVICES_CONNECTED is left to 0. Set 1 if it is the case.
1424 if (denali->devnum == 0) {
1426 iowrite32(1, denali->flash_reg + DEVICES_CONNECTED);
1429 if (denali->devnum == 1)
1432 if (denali->devnum != 2) {
1433 dev_err(denali->dev, "unsupported number of devices %d\n",
1438 /* 2 chips in parallel */
1440 mtd->erasesize <<= 1;
1441 mtd->writesize <<= 1;
1443 chip->chipsize <<= 1;
1444 chip->page_shift += 1;
1445 chip->phys_erase_shift += 1;
1446 chip->bbt_erase_shift += 1;
1447 chip->chip_shift += 1;
1448 chip->pagemask <<= 1;
1449 chip->ecc.size <<= 1;
1450 chip->ecc.bytes <<= 1;
1451 chip->ecc.strength <<= 1;
1452 denali->bbtskipbytes <<= 1;
1457 int denali_init(struct denali_nand_info *denali)
1459 struct nand_chip *chip = &denali->nand;
1460 struct mtd_info *mtd = nand_to_mtd(chip);
1463 if (denali->platform == INTEL_CE4100) {
1465 * Due to a silicon limitation, we can only support
1466 * ONFI timing mode 1 and below.
1468 if (onfi_timing_mode < -1 || onfi_timing_mode > 1) {
1469 pr_err("Intel CE4100 only supports ONFI timing mode 1 or below\n");
1474 /* allocate a temporary buffer for nand_scan_ident() */
1475 denali->buf.buf = devm_kzalloc(denali->dev, PAGE_SIZE,
1476 GFP_DMA | GFP_KERNEL);
1477 if (!denali->buf.buf)
1480 mtd->dev.parent = denali->dev;
1481 denali_hw_init(denali);
1482 denali_drv_init(denali);
1484 /* Request IRQ after all the hardware initialization is finished */
1485 ret = devm_request_irq(denali->dev, denali->irq, denali_isr,
1486 IRQF_SHARED, DENALI_NAND_NAME, denali);
1488 dev_err(denali->dev, "Unable to request IRQ\n");
1492 /* now that our ISR is registered, we can enable interrupts */
1493 denali_set_intr_modes(denali, true);
1494 mtd->name = "denali-nand";
1495 nand_set_flash_node(chip, denali->dev->of_node);
1497 /* register the driver with the NAND core subsystem */
1498 chip->select_chip = denali_select_chip;
1499 chip->cmdfunc = denali_cmdfunc;
1500 chip->read_byte = denali_read_byte;
1501 chip->waitfunc = denali_waitfunc;
1504 * scan for NAND devices attached to the controller
1505 * this is the first stage in a two step process to register
1506 * with the nand subsystem
1508 ret = nand_scan_ident(mtd, denali->max_banks, NULL);
1510 goto failed_req_irq;
1512 /* allocate the right size buffer now */
1513 devm_kfree(denali->dev, denali->buf.buf);
1514 denali->buf.buf = devm_kzalloc(denali->dev,
1515 mtd->writesize + mtd->oobsize,
1517 if (!denali->buf.buf) {
1519 goto failed_req_irq;
1522 /* Is 32-bit DMA supported? */
1523 ret = dma_set_mask(denali->dev, DMA_BIT_MASK(32));
1525 dev_err(denali->dev, "No usable DMA configuration\n");
1526 goto failed_req_irq;
1529 denali->buf.dma_buf = dma_map_single(denali->dev, denali->buf.buf,
1530 mtd->writesize + mtd->oobsize,
1532 if (dma_mapping_error(denali->dev, denali->buf.dma_buf)) {
1533 dev_err(denali->dev, "Failed to map DMA buffer\n");
1535 goto failed_req_irq;
1539 * second stage of the NAND scan
1540 * this stage requires information regarding ECC and
1541 * bad block management.
1544 /* Bad block management */
1545 chip->bbt_td = &bbt_main_descr;
1546 chip->bbt_md = &bbt_mirror_descr;
1548 /* skip the scan for now until we have OOB read and write support */
1549 chip->bbt_options |= NAND_BBT_USE_FLASH;
1550 chip->options |= NAND_SKIP_BBTSCAN;
1551 chip->ecc.mode = NAND_ECC_HW_SYNDROME;
1553 /* no subpage writes on denali */
1554 chip->options |= NAND_NO_SUBPAGE_WRITE;
1557 * Denali Controller only support 15bit and 8bit ECC in MRST,
1558 * so just let controller do 15bit ECC for MLC and 8bit ECC for
1561 if (!nand_is_slc(chip) &&
1562 (mtd->oobsize > (denali->bbtskipbytes +
1563 ECC_15BITS * (mtd->writesize /
1564 ECC_SECTOR_SIZE)))) {
1565 /* if MLC OOB size is large enough, use 15bit ECC*/
1566 chip->ecc.strength = 15;
1567 chip->ecc.bytes = ECC_15BITS;
1568 iowrite32(15, denali->flash_reg + ECC_CORRECTION);
1569 } else if (mtd->oobsize < (denali->bbtskipbytes +
1570 ECC_8BITS * (mtd->writesize /
1571 ECC_SECTOR_SIZE))) {
1572 pr_err("Your NAND chip OOB is not large enough to contain 8bit ECC correction codes");
1573 goto failed_req_irq;
1575 chip->ecc.strength = 8;
1576 chip->ecc.bytes = ECC_8BITS;
1577 iowrite32(8, denali->flash_reg + ECC_CORRECTION);
1580 mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
1582 /* override the default read operations */
1583 chip->ecc.size = ECC_SECTOR_SIZE;
1584 chip->ecc.read_page = denali_read_page;
1585 chip->ecc.read_page_raw = denali_read_page_raw;
1586 chip->ecc.write_page = denali_write_page;
1587 chip->ecc.write_page_raw = denali_write_page_raw;
1588 chip->ecc.read_oob = denali_read_oob;
1589 chip->ecc.write_oob = denali_write_oob;
1590 chip->erase = denali_erase;
1592 ret = denali_multidev_fixup(denali);
1594 goto failed_req_irq;
1596 ret = nand_scan_tail(mtd);
1598 goto failed_req_irq;
1600 ret = mtd_device_register(mtd, NULL, 0);
1602 dev_err(denali->dev, "Failed to register MTD: %d\n", ret);
1603 goto failed_req_irq;
1608 denali_irq_cleanup(denali->irq, denali);
1612 EXPORT_SYMBOL(denali_init);
1614 /* driver exit point */
1615 void denali_remove(struct denali_nand_info *denali)
1617 struct mtd_info *mtd = nand_to_mtd(&denali->nand);
1619 * Pre-compute DMA buffer size to avoid any problems in case
1620 * nand_release() ever changes in a way that mtd->writesize and
1621 * mtd->oobsize are not reliable after this call.
1623 int bufsize = mtd->writesize + mtd->oobsize;
1626 denali_irq_cleanup(denali->irq, denali);
1627 dma_unmap_single(denali->dev, denali->buf.dma_buf, bufsize,
1630 EXPORT_SYMBOL(denali_remove);