2 * Freescale GPMI NAND Flash Driver
4 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
5 * Copyright (C) 2008 Embedded Alley Solutions, Inc.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/clk.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/mtd/gpmi-nand.h>
29 #include <linux/mtd/partitions.h>
30 #include <linux/pinctrl/consumer.h>
32 #include <linux/of_device.h>
33 #include <linux/of_mtd.h>
34 #include "gpmi-nand.h"
36 /* add our owner bbt descriptor */
37 static uint8_t scan_ff_pattern[] = { 0xff };
38 static struct nand_bbt_descr gpmi_bbt_descr = {
42 .pattern = scan_ff_pattern
45 /* We will use all the (page + OOB). */
46 static struct nand_ecclayout gpmi_hw_ecclayout = {
49 .oobfree = { {.offset = 0, .length = 0} }
52 static irqreturn_t bch_irq(int irq, void *cookie)
54 struct gpmi_nand_data *this = cookie;
57 complete(&this->bch_done);
62 * Calculate the ECC strength by hand:
63 * E : The ECC strength.
64 * G : the length of Galois Field.
65 * N : The chunk count of per page.
66 * O : the oobsize of the NAND chip.
67 * M : the metasize of per page.
71 * ------------ <= (O - M)
79 static inline int get_ecc_strength(struct gpmi_nand_data *this)
81 struct bch_geometry *geo = &this->bch_geometry;
82 struct mtd_info *mtd = &this->mtd;
85 ecc_strength = ((mtd->oobsize - geo->metadata_size) * 8)
86 / (geo->gf_len * geo->ecc_chunk_count);
88 /* We need the minor even number. */
89 return round_down(ecc_strength, 2);
92 int common_nfc_set_geometry(struct gpmi_nand_data *this)
94 struct bch_geometry *geo = &this->bch_geometry;
95 struct mtd_info *mtd = &this->mtd;
96 unsigned int metadata_size;
97 unsigned int status_size;
98 unsigned int block_mark_bit_offset;
101 * The size of the metadata can be changed, though we set it to 10
102 * bytes now. But it can't be too large, because we have to save
103 * enough space for BCH.
105 geo->metadata_size = 10;
107 /* The default for the length of Galois Field. */
110 /* The default for chunk size. There is no oobsize greater then 512. */
111 geo->ecc_chunk_size = 512;
112 while (geo->ecc_chunk_size < mtd->oobsize)
113 geo->ecc_chunk_size *= 2; /* keep C >= O */
115 geo->ecc_chunk_count = mtd->writesize / geo->ecc_chunk_size;
117 /* We use the same ECC strength for all chunks. */
118 geo->ecc_strength = get_ecc_strength(this);
119 if (!geo->ecc_strength) {
120 pr_err("wrong ECC strength.\n");
124 geo->page_size = mtd->writesize + mtd->oobsize;
125 geo->payload_size = mtd->writesize;
128 * The auxiliary buffer contains the metadata and the ECC status. The
129 * metadata is padded to the nearest 32-bit boundary. The ECC status
130 * contains one byte for every ECC chunk, and is also padded to the
131 * nearest 32-bit boundary.
133 metadata_size = ALIGN(geo->metadata_size, 4);
134 status_size = ALIGN(geo->ecc_chunk_count, 4);
136 geo->auxiliary_size = metadata_size + status_size;
137 geo->auxiliary_status_offset = metadata_size;
139 if (!this->swap_block_mark)
143 * We need to compute the byte and bit offsets of
144 * the physical block mark within the ECC-based view of the page.
146 * NAND chip with 2K page shows below:
152 * +---+----------+-+----------+-+----------+-+----------+-+
153 * | M | data |E| data |E| data |E| data |E|
154 * +---+----------+-+----------+-+----------+-+----------+-+
156 * The position of block mark moves forward in the ECC-based view
157 * of page, and the delta is:
160 * D = (---------------- + M)
163 * With the formula to compute the ECC strength, and the condition
164 * : C >= O (C is the ecc chunk size)
166 * It's easy to deduce to the following result:
168 * E * G (O - M) C - M C - M
169 * ----------- <= ------- <= -------- < ---------
175 * D = (---------------- + M) < C
178 * The above inequality means the position of block mark
179 * within the ECC-based view of the page is still in the data chunk,
180 * and it's NOT in the ECC bits of the chunk.
182 * Use the following to compute the bit position of the
183 * physical block mark within the ECC-based view of the page:
184 * (page_size - D) * 8
188 block_mark_bit_offset = mtd->writesize * 8 -
189 (geo->ecc_strength * geo->gf_len * (geo->ecc_chunk_count - 1)
190 + geo->metadata_size * 8);
192 geo->block_mark_byte_offset = block_mark_bit_offset / 8;
193 geo->block_mark_bit_offset = block_mark_bit_offset % 8;
197 struct dma_chan *get_dma_chan(struct gpmi_nand_data *this)
199 int chipnr = this->current_chip;
201 return this->dma_chans[chipnr];
204 /* Can we use the upper's buffer directly for DMA? */
205 void prepare_data_dma(struct gpmi_nand_data *this, enum dma_data_direction dr)
207 struct scatterlist *sgl = &this->data_sgl;
210 this->direct_dma_map_ok = true;
212 /* first try to map the upper buffer directly */
213 sg_init_one(sgl, this->upper_buf, this->upper_len);
214 ret = dma_map_sg(this->dev, sgl, 1, dr);
216 /* We have to use our own DMA buffer. */
217 sg_init_one(sgl, this->data_buffer_dma, PAGE_SIZE);
219 if (dr == DMA_TO_DEVICE)
220 memcpy(this->data_buffer_dma, this->upper_buf,
223 ret = dma_map_sg(this->dev, sgl, 1, dr);
225 pr_err("map failed.\n");
227 this->direct_dma_map_ok = false;
231 /* This will be called after the DMA operation is finished. */
232 static void dma_irq_callback(void *param)
234 struct gpmi_nand_data *this = param;
235 struct completion *dma_c = &this->dma_done;
239 switch (this->dma_type) {
240 case DMA_FOR_COMMAND:
241 dma_unmap_sg(this->dev, &this->cmd_sgl, 1, DMA_TO_DEVICE);
244 case DMA_FOR_READ_DATA:
245 dma_unmap_sg(this->dev, &this->data_sgl, 1, DMA_FROM_DEVICE);
246 if (this->direct_dma_map_ok == false)
247 memcpy(this->upper_buf, this->data_buffer_dma,
251 case DMA_FOR_WRITE_DATA:
252 dma_unmap_sg(this->dev, &this->data_sgl, 1, DMA_TO_DEVICE);
255 case DMA_FOR_READ_ECC_PAGE:
256 case DMA_FOR_WRITE_ECC_PAGE:
257 /* We have to wait the BCH interrupt to finish. */
261 pr_err("in wrong DMA operation.\n");
265 int start_dma_without_bch_irq(struct gpmi_nand_data *this,
266 struct dma_async_tx_descriptor *desc)
268 struct completion *dma_c = &this->dma_done;
271 init_completion(dma_c);
273 desc->callback = dma_irq_callback;
274 desc->callback_param = this;
275 dmaengine_submit(desc);
276 dma_async_issue_pending(get_dma_chan(this));
278 /* Wait for the interrupt from the DMA block. */
279 err = wait_for_completion_timeout(dma_c, msecs_to_jiffies(1000));
281 pr_err("DMA timeout, last DMA :%d\n", this->last_dma_type);
282 gpmi_dump_info(this);
289 * This function is used in BCH reading or BCH writing pages.
290 * It will wait for the BCH interrupt as long as ONE second.
291 * Actually, we must wait for two interrupts :
292 * [1] firstly the DMA interrupt and
293 * [2] secondly the BCH interrupt.
295 int start_dma_with_bch_irq(struct gpmi_nand_data *this,
296 struct dma_async_tx_descriptor *desc)
298 struct completion *bch_c = &this->bch_done;
301 /* Prepare to receive an interrupt from the BCH block. */
302 init_completion(bch_c);
305 start_dma_without_bch_irq(this, desc);
307 /* Wait for the interrupt from the BCH block. */
308 err = wait_for_completion_timeout(bch_c, msecs_to_jiffies(1000));
310 pr_err("BCH timeout, last DMA :%d\n", this->last_dma_type);
311 gpmi_dump_info(this);
318 acquire_register_block(struct gpmi_nand_data *this, const char *res_name)
320 struct platform_device *pdev = this->pdev;
321 struct resources *res = &this->resources;
325 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res_name);
327 pr_err("Can't get resource for %s\n", res_name);
331 p = ioremap(r->start, resource_size(r));
333 pr_err("Can't remap %s\n", res_name);
337 if (!strcmp(res_name, GPMI_NAND_GPMI_REGS_ADDR_RES_NAME))
339 else if (!strcmp(res_name, GPMI_NAND_BCH_REGS_ADDR_RES_NAME))
342 pr_err("unknown resource name : %s\n", res_name);
347 static void release_register_block(struct gpmi_nand_data *this)
349 struct resources *res = &this->resources;
351 iounmap(res->gpmi_regs);
353 iounmap(res->bch_regs);
354 res->gpmi_regs = NULL;
355 res->bch_regs = NULL;
359 acquire_bch_irq(struct gpmi_nand_data *this, irq_handler_t irq_h)
361 struct platform_device *pdev = this->pdev;
362 struct resources *res = &this->resources;
363 const char *res_name = GPMI_NAND_BCH_INTERRUPT_RES_NAME;
367 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, res_name);
369 pr_err("Can't get resource for %s\n", res_name);
373 err = request_irq(r->start, irq_h, 0, res_name, this);
375 pr_err("Can't own %s\n", res_name);
379 res->bch_low_interrupt = r->start;
380 res->bch_high_interrupt = r->end;
384 static void release_bch_irq(struct gpmi_nand_data *this)
386 struct resources *res = &this->resources;
387 int i = res->bch_low_interrupt;
389 for (; i <= res->bch_high_interrupt; i++)
393 static bool gpmi_dma_filter(struct dma_chan *chan, void *param)
395 struct gpmi_nand_data *this = param;
396 int dma_channel = (int)this->private;
398 if (!mxs_dma_is_apbh(chan))
401 * only catch the GPMI dma channels :
402 * for mx23 : MX23_DMA_GPMI0 ~ MX23_DMA_GPMI3
403 * (These four channels share the same IRQ!)
405 * for mx28 : MX28_DMA_GPMI0 ~ MX28_DMA_GPMI7
406 * (These eight channels share the same IRQ!)
408 if (dma_channel == chan->chan_id) {
409 chan->private = &this->dma_data;
415 static void release_dma_channels(struct gpmi_nand_data *this)
418 for (i = 0; i < DMA_CHANS; i++)
419 if (this->dma_chans[i]) {
420 dma_release_channel(this->dma_chans[i]);
421 this->dma_chans[i] = NULL;
425 static int __devinit acquire_dma_channels(struct gpmi_nand_data *this)
427 struct platform_device *pdev = this->pdev;
428 struct resource *r_dma;
429 struct device_node *dn;
432 struct dma_chan *dma_chan;
435 /* dma channel, we only use the first one. */
436 dn = pdev->dev.of_node;
437 ret = of_property_read_u32(dn, "fsl,gpmi-dma-channel", &dma_channel);
439 pr_err("unable to get DMA channel from dt.\n");
442 this->private = (void *)dma_channel;
444 /* gpmi dma interrupt */
445 r_dma = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
446 GPMI_NAND_DMA_INTERRUPT_RES_NAME);
448 pr_err("Can't get resource for DMA\n");
451 this->dma_data.chan_irq = r_dma->start;
453 /* request dma channel */
455 dma_cap_set(DMA_SLAVE, mask);
457 dma_chan = dma_request_channel(mask, gpmi_dma_filter, this);
459 pr_err("dma_request_channel failed.\n");
463 this->dma_chans[0] = dma_chan;
467 release_dma_channels(this);
471 static void gpmi_put_clks(struct gpmi_nand_data *this)
473 struct resources *r = &this->resources;
477 for (i = 0; i < GPMI_CLK_MAX; i++) {
486 static char *extra_clks_for_mx6q[GPMI_CLK_MAX] = {
487 "gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch",
490 static int __devinit gpmi_get_clks(struct gpmi_nand_data *this)
492 struct resources *r = &this->resources;
493 char **extra_clks = NULL;
497 /* The main clock is stored in the first. */
498 r->clock[0] = clk_get(this->dev, "gpmi_io");
499 if (IS_ERR(r->clock[0]))
502 /* Get extra clocks */
503 if (GPMI_IS_MX6Q(this))
504 extra_clks = extra_clks_for_mx6q;
508 for (i = 1; i < GPMI_CLK_MAX; i++) {
509 if (extra_clks[i - 1] == NULL)
512 clk = clk_get(this->dev, extra_clks[i - 1]);
519 if (GPMI_IS_MX6Q(this))
521 * Set the default value for the gpmi clock in mx6q:
523 * If you want to use the ONFI nand which is in the
524 * Synchronous Mode, you should change the clock as you need.
526 clk_set_rate(r->clock[0], 22000000);
531 dev_dbg(this->dev, "failed in finding the clocks.\n");
536 static int __devinit acquire_resources(struct gpmi_nand_data *this)
538 struct pinctrl *pinctrl;
541 ret = acquire_register_block(this, GPMI_NAND_GPMI_REGS_ADDR_RES_NAME);
545 ret = acquire_register_block(this, GPMI_NAND_BCH_REGS_ADDR_RES_NAME);
549 ret = acquire_bch_irq(this, bch_irq);
553 ret = acquire_dma_channels(this);
555 goto exit_dma_channels;
557 pinctrl = devm_pinctrl_get_select_default(&this->pdev->dev);
558 if (IS_ERR(pinctrl)) {
559 ret = PTR_ERR(pinctrl);
563 ret = gpmi_get_clks(this);
570 release_dma_channels(this);
572 release_bch_irq(this);
574 release_register_block(this);
578 static void release_resources(struct gpmi_nand_data *this)
581 release_register_block(this);
582 release_bch_irq(this);
583 release_dma_channels(this);
586 static int __devinit init_hardware(struct gpmi_nand_data *this)
591 * This structure contains the "safe" GPMI timing that should succeed
592 * with any NAND Flash device
593 * (although, with less-than-optimal performance).
595 struct nand_timing safe_timing = {
596 .data_setup_in_ns = 80,
597 .data_hold_in_ns = 60,
598 .address_setup_in_ns = 25,
599 .gpmi_sample_delay_in_ns = 6,
605 /* Initialize the hardwares. */
606 ret = gpmi_init(this);
610 this->timing = safe_timing;
614 static int read_page_prepare(struct gpmi_nand_data *this,
615 void *destination, unsigned length,
616 void *alt_virt, dma_addr_t alt_phys, unsigned alt_size,
617 void **use_virt, dma_addr_t *use_phys)
619 struct device *dev = this->dev;
621 if (virt_addr_valid(destination)) {
622 dma_addr_t dest_phys;
624 dest_phys = dma_map_single(dev, destination,
625 length, DMA_FROM_DEVICE);
626 if (dma_mapping_error(dev, dest_phys)) {
627 if (alt_size < length) {
628 pr_err("Alternate buffer is too small\n");
633 *use_virt = destination;
634 *use_phys = dest_phys;
635 this->direct_dma_map_ok = true;
640 *use_virt = alt_virt;
641 *use_phys = alt_phys;
642 this->direct_dma_map_ok = false;
646 static inline void read_page_end(struct gpmi_nand_data *this,
647 void *destination, unsigned length,
648 void *alt_virt, dma_addr_t alt_phys, unsigned alt_size,
649 void *used_virt, dma_addr_t used_phys)
651 if (this->direct_dma_map_ok)
652 dma_unmap_single(this->dev, used_phys, length, DMA_FROM_DEVICE);
655 static inline void read_page_swap_end(struct gpmi_nand_data *this,
656 void *destination, unsigned length,
657 void *alt_virt, dma_addr_t alt_phys, unsigned alt_size,
658 void *used_virt, dma_addr_t used_phys)
660 if (!this->direct_dma_map_ok)
661 memcpy(destination, alt_virt, length);
664 static int send_page_prepare(struct gpmi_nand_data *this,
665 const void *source, unsigned length,
666 void *alt_virt, dma_addr_t alt_phys, unsigned alt_size,
667 const void **use_virt, dma_addr_t *use_phys)
669 struct device *dev = this->dev;
671 if (virt_addr_valid(source)) {
672 dma_addr_t source_phys;
674 source_phys = dma_map_single(dev, (void *)source, length,
676 if (dma_mapping_error(dev, source_phys)) {
677 if (alt_size < length) {
678 pr_err("Alternate buffer is too small\n");
684 *use_phys = source_phys;
689 * Copy the content of the source buffer into the alternate
690 * buffer and set up the return values accordingly.
692 memcpy(alt_virt, source, length);
694 *use_virt = alt_virt;
695 *use_phys = alt_phys;
699 static void send_page_end(struct gpmi_nand_data *this,
700 const void *source, unsigned length,
701 void *alt_virt, dma_addr_t alt_phys, unsigned alt_size,
702 const void *used_virt, dma_addr_t used_phys)
704 struct device *dev = this->dev;
705 if (used_virt == source)
706 dma_unmap_single(dev, used_phys, length, DMA_TO_DEVICE);
709 static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
711 struct device *dev = this->dev;
713 if (this->page_buffer_virt && virt_addr_valid(this->page_buffer_virt))
714 dma_free_coherent(dev, this->page_buffer_size,
715 this->page_buffer_virt,
716 this->page_buffer_phys);
717 kfree(this->cmd_buffer);
718 kfree(this->data_buffer_dma);
720 this->cmd_buffer = NULL;
721 this->data_buffer_dma = NULL;
722 this->page_buffer_virt = NULL;
723 this->page_buffer_size = 0;
726 /* Allocate the DMA buffers */
727 static int gpmi_alloc_dma_buffer(struct gpmi_nand_data *this)
729 struct bch_geometry *geo = &this->bch_geometry;
730 struct device *dev = this->dev;
732 /* [1] Allocate a command buffer. PAGE_SIZE is enough. */
733 this->cmd_buffer = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
734 if (this->cmd_buffer == NULL)
737 /* [2] Allocate a read/write data buffer. PAGE_SIZE is enough. */
738 this->data_buffer_dma = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
739 if (this->data_buffer_dma == NULL)
743 * [3] Allocate the page buffer.
745 * Both the payload buffer and the auxiliary buffer must appear on
746 * 32-bit boundaries. We presume the size of the payload buffer is a
747 * power of two and is much larger than four, which guarantees the
748 * auxiliary buffer will appear on a 32-bit boundary.
750 this->page_buffer_size = geo->payload_size + geo->auxiliary_size;
751 this->page_buffer_virt = dma_alloc_coherent(dev, this->page_buffer_size,
752 &this->page_buffer_phys, GFP_DMA);
753 if (!this->page_buffer_virt)
757 /* Slice up the page buffer. */
758 this->payload_virt = this->page_buffer_virt;
759 this->payload_phys = this->page_buffer_phys;
760 this->auxiliary_virt = this->payload_virt + geo->payload_size;
761 this->auxiliary_phys = this->payload_phys + geo->payload_size;
765 gpmi_free_dma_buffer(this);
766 pr_err("allocate DMA buffer ret!!\n");
770 static void gpmi_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
772 struct nand_chip *chip = mtd->priv;
773 struct gpmi_nand_data *this = chip->priv;
777 * Every operation begins with a command byte and a series of zero or
778 * more address bytes. These are distinguished by either the Address
779 * Latch Enable (ALE) or Command Latch Enable (CLE) signals being
780 * asserted. When MTD is ready to execute the command, it will deassert
781 * both latch enables.
783 * Rather than run a separate DMA operation for every single byte, we
784 * queue them up and run a single DMA operation for the entire series
785 * of command and data bytes. NAND_CMD_NONE means the END of the queue.
787 if ((ctrl & (NAND_ALE | NAND_CLE))) {
788 if (data != NAND_CMD_NONE)
789 this->cmd_buffer[this->command_length++] = data;
793 if (!this->command_length)
796 ret = gpmi_send_command(this);
798 pr_err("Chip: %u, Error %d\n", this->current_chip, ret);
800 this->command_length = 0;
803 static int gpmi_dev_ready(struct mtd_info *mtd)
805 struct nand_chip *chip = mtd->priv;
806 struct gpmi_nand_data *this = chip->priv;
808 return gpmi_is_ready(this, this->current_chip);
811 static void gpmi_select_chip(struct mtd_info *mtd, int chipnr)
813 struct nand_chip *chip = mtd->priv;
814 struct gpmi_nand_data *this = chip->priv;
816 if ((this->current_chip < 0) && (chipnr >= 0))
818 else if ((this->current_chip >= 0) && (chipnr < 0))
821 this->current_chip = chipnr;
824 static void gpmi_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
826 struct nand_chip *chip = mtd->priv;
827 struct gpmi_nand_data *this = chip->priv;
829 pr_debug("len is %d\n", len);
830 this->upper_buf = buf;
831 this->upper_len = len;
833 gpmi_read_data(this);
836 static void gpmi_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
838 struct nand_chip *chip = mtd->priv;
839 struct gpmi_nand_data *this = chip->priv;
841 pr_debug("len is %d\n", len);
842 this->upper_buf = (uint8_t *)buf;
843 this->upper_len = len;
845 gpmi_send_data(this);
848 static uint8_t gpmi_read_byte(struct mtd_info *mtd)
850 struct nand_chip *chip = mtd->priv;
851 struct gpmi_nand_data *this = chip->priv;
852 uint8_t *buf = this->data_buffer_dma;
854 gpmi_read_buf(mtd, buf, 1);
859 * Handles block mark swapping.
860 * It can be called in swapping the block mark, or swapping it back,
861 * because the the operations are the same.
863 static void block_mark_swapping(struct gpmi_nand_data *this,
864 void *payload, void *auxiliary)
866 struct bch_geometry *nfc_geo = &this->bch_geometry;
871 unsigned char from_data;
872 unsigned char from_oob;
874 if (!this->swap_block_mark)
878 * If control arrives here, we're swapping. Make some convenience
881 bit = nfc_geo->block_mark_bit_offset;
882 p = payload + nfc_geo->block_mark_byte_offset;
886 * Get the byte from the data area that overlays the block mark. Since
887 * the ECC engine applies its own view to the bits in the page, the
888 * physical block mark won't (in general) appear on a byte boundary in
891 from_data = (p[0] >> bit) | (p[1] << (8 - bit));
893 /* Get the byte from the OOB. */
899 mask = (0x1 << bit) - 1;
900 p[0] = (p[0] & mask) | (from_oob << bit);
903 p[1] = (p[1] & mask) | (from_oob >> (8 - bit));
906 static int gpmi_ecc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
907 uint8_t *buf, int oob_required, int page)
909 struct gpmi_nand_data *this = chip->priv;
910 struct bch_geometry *nfc_geo = &this->bch_geometry;
912 dma_addr_t payload_phys;
913 void *auxiliary_virt;
914 dma_addr_t auxiliary_phys;
916 unsigned char *status;
918 unsigned int corrected;
921 pr_debug("page number is : %d\n", page);
922 ret = read_page_prepare(this, buf, mtd->writesize,
923 this->payload_virt, this->payload_phys,
924 nfc_geo->payload_size,
925 &payload_virt, &payload_phys);
927 pr_err("Inadequate DMA buffer\n");
931 auxiliary_virt = this->auxiliary_virt;
932 auxiliary_phys = this->auxiliary_phys;
935 ret = gpmi_read_page(this, payload_phys, auxiliary_phys);
936 read_page_end(this, buf, mtd->writesize,
937 this->payload_virt, this->payload_phys,
938 nfc_geo->payload_size,
939 payload_virt, payload_phys);
941 pr_err("Error in ECC-based read: %d\n", ret);
945 /* handle the block mark swapping */
946 block_mark_swapping(this, payload_virt, auxiliary_virt);
948 /* Loop over status bytes, accumulating ECC status. */
951 status = auxiliary_virt + nfc_geo->auxiliary_status_offset;
953 for (i = 0; i < nfc_geo->ecc_chunk_count; i++, status++) {
954 if ((*status == STATUS_GOOD) || (*status == STATUS_ERASED))
957 if (*status == STATUS_UNCORRECTABLE) {
961 corrected += *status;
965 * Propagate ECC status to the owning MTD only when failed or
966 * corrected times nearly reaches our ECC correction threshold.
968 if (failed || corrected >= (nfc_geo->ecc_strength - 1)) {
969 mtd->ecc_stats.failed += failed;
970 mtd->ecc_stats.corrected += corrected;
975 * It's time to deliver the OOB bytes. See gpmi_ecc_read_oob()
976 * for details about our policy for delivering the OOB.
978 * We fill the caller's buffer with set bits, and then copy the
979 * block mark to th caller's buffer. Note that, if block mark
980 * swapping was necessary, it has already been done, so we can
981 * rely on the first byte of the auxiliary buffer to contain
984 memset(chip->oob_poi, ~0, mtd->oobsize);
985 chip->oob_poi[0] = ((uint8_t *) auxiliary_virt)[0];
988 read_page_swap_end(this, buf, mtd->writesize,
989 this->payload_virt, this->payload_phys,
990 nfc_geo->payload_size,
991 payload_virt, payload_phys);
996 static int gpmi_ecc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
997 const uint8_t *buf, int oob_required)
999 struct gpmi_nand_data *this = chip->priv;
1000 struct bch_geometry *nfc_geo = &this->bch_geometry;
1001 const void *payload_virt;
1002 dma_addr_t payload_phys;
1003 const void *auxiliary_virt;
1004 dma_addr_t auxiliary_phys;
1007 pr_debug("ecc write page.\n");
1008 if (this->swap_block_mark) {
1010 * If control arrives here, we're doing block mark swapping.
1011 * Since we can't modify the caller's buffers, we must copy them
1014 memcpy(this->payload_virt, buf, mtd->writesize);
1015 payload_virt = this->payload_virt;
1016 payload_phys = this->payload_phys;
1018 memcpy(this->auxiliary_virt, chip->oob_poi,
1019 nfc_geo->auxiliary_size);
1020 auxiliary_virt = this->auxiliary_virt;
1021 auxiliary_phys = this->auxiliary_phys;
1023 /* Handle block mark swapping. */
1024 block_mark_swapping(this,
1025 (void *) payload_virt, (void *) auxiliary_virt);
1028 * If control arrives here, we're not doing block mark swapping,
1029 * so we can to try and use the caller's buffers.
1031 ret = send_page_prepare(this,
1032 buf, mtd->writesize,
1033 this->payload_virt, this->payload_phys,
1034 nfc_geo->payload_size,
1035 &payload_virt, &payload_phys);
1037 pr_err("Inadequate payload DMA buffer\n");
1041 ret = send_page_prepare(this,
1042 chip->oob_poi, mtd->oobsize,
1043 this->auxiliary_virt, this->auxiliary_phys,
1044 nfc_geo->auxiliary_size,
1045 &auxiliary_virt, &auxiliary_phys);
1047 pr_err("Inadequate auxiliary DMA buffer\n");
1048 goto exit_auxiliary;
1053 ret = gpmi_send_page(this, payload_phys, auxiliary_phys);
1055 pr_err("Error in ECC-based write: %d\n", ret);
1057 if (!this->swap_block_mark) {
1058 send_page_end(this, chip->oob_poi, mtd->oobsize,
1059 this->auxiliary_virt, this->auxiliary_phys,
1060 nfc_geo->auxiliary_size,
1061 auxiliary_virt, auxiliary_phys);
1063 send_page_end(this, buf, mtd->writesize,
1064 this->payload_virt, this->payload_phys,
1065 nfc_geo->payload_size,
1066 payload_virt, payload_phys);
1073 * There are several places in this driver where we have to handle the OOB and
1074 * block marks. This is the function where things are the most complicated, so
1075 * this is where we try to explain it all. All the other places refer back to
1078 * These are the rules, in order of decreasing importance:
1080 * 1) Nothing the caller does can be allowed to imperil the block mark.
1082 * 2) In read operations, the first byte of the OOB we return must reflect the
1083 * true state of the block mark, no matter where that block mark appears in
1084 * the physical page.
1086 * 3) ECC-based read operations return an OOB full of set bits (since we never
1087 * allow ECC-based writes to the OOB, it doesn't matter what ECC-based reads
1090 * 4) "Raw" read operations return a direct view of the physical bytes in the
1091 * page, using the conventional definition of which bytes are data and which
1092 * are OOB. This gives the caller a way to see the actual, physical bytes
1093 * in the page, without the distortions applied by our ECC engine.
1096 * What we do for this specific read operation depends on two questions:
1098 * 1) Are we doing a "raw" read, or an ECC-based read?
1100 * 2) Are we using block mark swapping or transcription?
1102 * There are four cases, illustrated by the following Karnaugh map:
1104 * | Raw | ECC-based |
1105 * -------------+-------------------------+-------------------------+
1106 * | Read the conventional | |
1107 * | OOB at the end of the | |
1108 * Swapping | page and return it. It | |
1109 * | contains exactly what | |
1110 * | we want. | Read the block mark and |
1111 * -------------+-------------------------+ return it in a buffer |
1112 * | Read the conventional | full of set bits. |
1113 * | OOB at the end of the | |
1114 * | page and also the block | |
1115 * Transcribing | mark in the metadata. | |
1116 * | Copy the block mark | |
1117 * | into the first byte of | |
1119 * -------------+-------------------------+-------------------------+
1121 * Note that we break rule #4 in the Transcribing/Raw case because we're not
1122 * giving an accurate view of the actual, physical bytes in the page (we're
1123 * overwriting the block mark). That's OK because it's more important to follow
1126 * It turns out that knowing whether we want an "ECC-based" or "raw" read is not
1127 * easy. When reading a page, for example, the NAND Flash MTD code calls our
1128 * ecc.read_page or ecc.read_page_raw function. Thus, the fact that MTD wants an
1129 * ECC-based or raw view of the page is implicit in which function it calls
1130 * (there is a similar pair of ECC-based/raw functions for writing).
1132 * FIXME: The following paragraph is incorrect, now that there exist
1133 * ecc.read_oob_raw and ecc.write_oob_raw functions.
1135 * Since MTD assumes the OOB is not covered by ECC, there is no pair of
1136 * ECC-based/raw functions for reading or or writing the OOB. The fact that the
1137 * caller wants an ECC-based or raw view of the page is not propagated down to
1140 static int gpmi_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
1143 struct gpmi_nand_data *this = chip->priv;
1145 pr_debug("page number is %d\n", page);
1146 /* clear the OOB buffer */
1147 memset(chip->oob_poi, ~0, mtd->oobsize);
1149 /* Read out the conventional OOB. */
1150 chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
1151 chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
1154 * Now, we want to make sure the block mark is correct. In the
1155 * Swapping/Raw case, we already have it. Otherwise, we need to
1156 * explicitly read it.
1158 if (!this->swap_block_mark) {
1159 /* Read the block mark into the first byte of the OOB buffer. */
1160 chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
1161 chip->oob_poi[0] = chip->read_byte(mtd);
1168 gpmi_ecc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, int page)
1171 * The BCH will use all the (page + oob).
1172 * Our gpmi_hw_ecclayout can only prohibit the JFFS2 to write the oob.
1173 * But it can not stop some ioctls such MEMWRITEOOB which uses
1174 * MTD_OPS_PLACE_OOB. So We have to implement this function to prohibit
1180 static int gpmi_block_markbad(struct mtd_info *mtd, loff_t ofs)
1182 struct nand_chip *chip = mtd->priv;
1183 struct gpmi_nand_data *this = chip->priv;
1185 uint8_t *block_mark;
1186 int column, page, status, chipnr;
1188 /* Get block number */
1189 block = (int)(ofs >> chip->bbt_erase_shift);
1191 chip->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1193 /* Do we have a flash based bad block table ? */
1194 if (chip->bbt_options & NAND_BBT_USE_FLASH)
1195 ret = nand_update_bbt(mtd, ofs);
1197 chipnr = (int)(ofs >> chip->chip_shift);
1198 chip->select_chip(mtd, chipnr);
1200 column = this->swap_block_mark ? mtd->writesize : 0;
1202 /* Write the block mark. */
1203 block_mark = this->data_buffer_dma;
1204 block_mark[0] = 0; /* bad block marker */
1206 /* Shift to get page */
1207 page = (int)(ofs >> chip->page_shift);
1209 chip->cmdfunc(mtd, NAND_CMD_SEQIN, column, page);
1210 chip->write_buf(mtd, block_mark, 1);
1211 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
1213 status = chip->waitfunc(mtd, chip);
1214 if (status & NAND_STATUS_FAIL)
1217 chip->select_chip(mtd, -1);
1220 mtd->ecc_stats.badblocks++;
1225 static int nand_boot_set_geometry(struct gpmi_nand_data *this)
1227 struct boot_rom_geometry *geometry = &this->rom_geometry;
1230 * Set the boot block stride size.
1232 * In principle, we should be reading this from the OTP bits, since
1233 * that's where the ROM is going to get it. In fact, we don't have any
1234 * way to read the OTP bits, so we go with the default and hope for the
1237 geometry->stride_size_in_pages = 64;
1240 * Set the search area stride exponent.
1242 * In principle, we should be reading this from the OTP bits, since
1243 * that's where the ROM is going to get it. In fact, we don't have any
1244 * way to read the OTP bits, so we go with the default and hope for the
1247 geometry->search_area_stride_exponent = 2;
1251 static const char *fingerprint = "STMP";
1252 static int mx23_check_transcription_stamp(struct gpmi_nand_data *this)
1254 struct boot_rom_geometry *rom_geo = &this->rom_geometry;
1255 struct device *dev = this->dev;
1256 struct mtd_info *mtd = &this->mtd;
1257 struct nand_chip *chip = &this->nand;
1258 unsigned int search_area_size_in_strides;
1259 unsigned int stride;
1261 uint8_t *buffer = chip->buffers->databuf;
1262 int saved_chip_number;
1263 int found_an_ncb_fingerprint = false;
1265 /* Compute the number of strides in a search area. */
1266 search_area_size_in_strides = 1 << rom_geo->search_area_stride_exponent;
1268 saved_chip_number = this->current_chip;
1269 chip->select_chip(mtd, 0);
1272 * Loop through the first search area, looking for the NCB fingerprint.
1274 dev_dbg(dev, "Scanning for an NCB fingerprint...\n");
1276 for (stride = 0; stride < search_area_size_in_strides; stride++) {
1277 /* Compute the page addresses. */
1278 page = stride * rom_geo->stride_size_in_pages;
1280 dev_dbg(dev, "Looking for a fingerprint in page 0x%x\n", page);
1283 * Read the NCB fingerprint. The fingerprint is four bytes long
1284 * and starts in the 12th byte of the page.
1286 chip->cmdfunc(mtd, NAND_CMD_READ0, 12, page);
1287 chip->read_buf(mtd, buffer, strlen(fingerprint));
1289 /* Look for the fingerprint. */
1290 if (!memcmp(buffer, fingerprint, strlen(fingerprint))) {
1291 found_an_ncb_fingerprint = true;
1297 chip->select_chip(mtd, saved_chip_number);
1299 if (found_an_ncb_fingerprint)
1300 dev_dbg(dev, "\tFound a fingerprint\n");
1302 dev_dbg(dev, "\tNo fingerprint found\n");
1303 return found_an_ncb_fingerprint;
1306 /* Writes a transcription stamp. */
1307 static int mx23_write_transcription_stamp(struct gpmi_nand_data *this)
1309 struct device *dev = this->dev;
1310 struct boot_rom_geometry *rom_geo = &this->rom_geometry;
1311 struct mtd_info *mtd = &this->mtd;
1312 struct nand_chip *chip = &this->nand;
1313 unsigned int block_size_in_pages;
1314 unsigned int search_area_size_in_strides;
1315 unsigned int search_area_size_in_pages;
1316 unsigned int search_area_size_in_blocks;
1318 unsigned int stride;
1320 uint8_t *buffer = chip->buffers->databuf;
1321 int saved_chip_number;
1324 /* Compute the search area geometry. */
1325 block_size_in_pages = mtd->erasesize / mtd->writesize;
1326 search_area_size_in_strides = 1 << rom_geo->search_area_stride_exponent;
1327 search_area_size_in_pages = search_area_size_in_strides *
1328 rom_geo->stride_size_in_pages;
1329 search_area_size_in_blocks =
1330 (search_area_size_in_pages + (block_size_in_pages - 1)) /
1331 block_size_in_pages;
1333 dev_dbg(dev, "Search Area Geometry :\n");
1334 dev_dbg(dev, "\tin Blocks : %u\n", search_area_size_in_blocks);
1335 dev_dbg(dev, "\tin Strides: %u\n", search_area_size_in_strides);
1336 dev_dbg(dev, "\tin Pages : %u\n", search_area_size_in_pages);
1338 /* Select chip 0. */
1339 saved_chip_number = this->current_chip;
1340 chip->select_chip(mtd, 0);
1342 /* Loop over blocks in the first search area, erasing them. */
1343 dev_dbg(dev, "Erasing the search area...\n");
1345 for (block = 0; block < search_area_size_in_blocks; block++) {
1346 /* Compute the page address. */
1347 page = block * block_size_in_pages;
1349 /* Erase this block. */
1350 dev_dbg(dev, "\tErasing block 0x%x\n", block);
1351 chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
1352 chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
1354 /* Wait for the erase to finish. */
1355 status = chip->waitfunc(mtd, chip);
1356 if (status & NAND_STATUS_FAIL)
1357 dev_err(dev, "[%s] Erase failed.\n", __func__);
1360 /* Write the NCB fingerprint into the page buffer. */
1361 memset(buffer, ~0, mtd->writesize);
1362 memset(chip->oob_poi, ~0, mtd->oobsize);
1363 memcpy(buffer + 12, fingerprint, strlen(fingerprint));
1365 /* Loop through the first search area, writing NCB fingerprints. */
1366 dev_dbg(dev, "Writing NCB fingerprints...\n");
1367 for (stride = 0; stride < search_area_size_in_strides; stride++) {
1368 /* Compute the page addresses. */
1369 page = stride * rom_geo->stride_size_in_pages;
1371 /* Write the first page of the current stride. */
1372 dev_dbg(dev, "Writing an NCB fingerprint in page 0x%x\n", page);
1373 chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
1374 chip->ecc.write_page_raw(mtd, chip, buffer, 0);
1375 chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
1377 /* Wait for the write to finish. */
1378 status = chip->waitfunc(mtd, chip);
1379 if (status & NAND_STATUS_FAIL)
1380 dev_err(dev, "[%s] Write failed.\n", __func__);
1383 /* Deselect chip 0. */
1384 chip->select_chip(mtd, saved_chip_number);
1388 static int mx23_boot_init(struct gpmi_nand_data *this)
1390 struct device *dev = this->dev;
1391 struct nand_chip *chip = &this->nand;
1392 struct mtd_info *mtd = &this->mtd;
1393 unsigned int block_count;
1402 * If control arrives here, we can't use block mark swapping, which
1403 * means we're forced to use transcription. First, scan for the
1404 * transcription stamp. If we find it, then we don't have to do
1405 * anything -- the block marks are already transcribed.
1407 if (mx23_check_transcription_stamp(this))
1411 * If control arrives here, we couldn't find a transcription stamp, so
1412 * so we presume the block marks are in the conventional location.
1414 dev_dbg(dev, "Transcribing bad block marks...\n");
1416 /* Compute the number of blocks in the entire medium. */
1417 block_count = chip->chipsize >> chip->phys_erase_shift;
1420 * Loop over all the blocks in the medium, transcribing block marks as
1423 for (block = 0; block < block_count; block++) {
1425 * Compute the chip, page and byte addresses for this block's
1426 * conventional mark.
1428 chipnr = block >> (chip->chip_shift - chip->phys_erase_shift);
1429 page = block << (chip->phys_erase_shift - chip->page_shift);
1430 byte = block << chip->phys_erase_shift;
1432 /* Send the command to read the conventional block mark. */
1433 chip->select_chip(mtd, chipnr);
1434 chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
1435 block_mark = chip->read_byte(mtd);
1436 chip->select_chip(mtd, -1);
1439 * Check if the block is marked bad. If so, we need to mark it
1440 * again, but this time the result will be a mark in the
1441 * location where we transcribe block marks.
1443 if (block_mark != 0xff) {
1444 dev_dbg(dev, "Transcribing mark in block %u\n", block);
1445 ret = chip->block_markbad(mtd, byte);
1447 dev_err(dev, "Failed to mark block bad with "
1452 /* Write the stamp that indicates we've transcribed the block marks. */
1453 mx23_write_transcription_stamp(this);
1457 static int nand_boot_init(struct gpmi_nand_data *this)
1459 nand_boot_set_geometry(this);
1461 /* This is ROM arch-specific initilization before the BBT scanning. */
1462 if (GPMI_IS_MX23(this))
1463 return mx23_boot_init(this);
1467 static int gpmi_set_geometry(struct gpmi_nand_data *this)
1471 /* Free the temporary DMA memory for reading ID. */
1472 gpmi_free_dma_buffer(this);
1474 /* Set up the NFC geometry which is used by BCH. */
1475 ret = bch_set_geometry(this);
1477 pr_err("set geometry ret : %d\n", ret);
1481 /* Alloc the new DMA buffers according to the pagesize and oobsize */
1482 return gpmi_alloc_dma_buffer(this);
1485 static int gpmi_pre_bbt_scan(struct gpmi_nand_data *this)
1489 /* Set up swap_block_mark, must be set before the gpmi_set_geometry() */
1490 if (GPMI_IS_MX23(this))
1491 this->swap_block_mark = false;
1493 this->swap_block_mark = true;
1495 /* Set up the medium geometry */
1496 ret = gpmi_set_geometry(this);
1500 /* Adjust the ECC strength according to the chip. */
1501 this->nand.ecc.strength = this->bch_geometry.ecc_strength;
1502 this->mtd.ecc_strength = this->bch_geometry.ecc_strength;
1503 this->mtd.bitflip_threshold = this->bch_geometry.ecc_strength;
1505 /* NAND boot init, depends on the gpmi_set_geometry(). */
1506 return nand_boot_init(this);
1509 static int gpmi_scan_bbt(struct mtd_info *mtd)
1511 struct nand_chip *chip = mtd->priv;
1512 struct gpmi_nand_data *this = chip->priv;
1515 /* Prepare for the BBT scan. */
1516 ret = gpmi_pre_bbt_scan(this);
1521 * Can we enable the extra features? such as EDO or Sync mode.
1523 * We do not check the return value now. That's means if we fail in
1524 * enable the extra features, we still can run in the normal way.
1526 gpmi_extra_init(this);
1528 /* use the default BBT implementation */
1529 return nand_default_bbt(mtd);
1532 static void gpmi_nfc_exit(struct gpmi_nand_data *this)
1534 nand_release(&this->mtd);
1535 gpmi_free_dma_buffer(this);
1538 static int __devinit gpmi_nfc_init(struct gpmi_nand_data *this)
1540 struct mtd_info *mtd = &this->mtd;
1541 struct nand_chip *chip = &this->nand;
1542 struct mtd_part_parser_data ppdata = {};
1545 /* init current chip */
1546 this->current_chip = -1;
1548 /* init the MTD data structures */
1550 mtd->name = "gpmi-nand";
1551 mtd->owner = THIS_MODULE;
1553 /* init the nand_chip{}, we don't support a 16-bit NAND Flash bus. */
1555 chip->select_chip = gpmi_select_chip;
1556 chip->cmd_ctrl = gpmi_cmd_ctrl;
1557 chip->dev_ready = gpmi_dev_ready;
1558 chip->read_byte = gpmi_read_byte;
1559 chip->read_buf = gpmi_read_buf;
1560 chip->write_buf = gpmi_write_buf;
1561 chip->ecc.read_page = gpmi_ecc_read_page;
1562 chip->ecc.write_page = gpmi_ecc_write_page;
1563 chip->ecc.read_oob = gpmi_ecc_read_oob;
1564 chip->ecc.write_oob = gpmi_ecc_write_oob;
1565 chip->scan_bbt = gpmi_scan_bbt;
1566 chip->badblock_pattern = &gpmi_bbt_descr;
1567 chip->block_markbad = gpmi_block_markbad;
1568 chip->options |= NAND_NO_SUBPAGE_WRITE;
1569 chip->ecc.mode = NAND_ECC_HW;
1571 chip->ecc.strength = 8;
1572 chip->ecc.layout = &gpmi_hw_ecclayout;
1573 if (of_get_nand_on_flash_bbt(this->dev->of_node))
1574 chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
1576 /* Allocate a temporary DMA buffer for reading ID in the nand_scan() */
1577 this->bch_geometry.payload_size = 1024;
1578 this->bch_geometry.auxiliary_size = 128;
1579 ret = gpmi_alloc_dma_buffer(this);
1583 ret = nand_scan(mtd, 1);
1585 pr_err("Chip scan failed\n");
1589 ppdata.of_node = this->pdev->dev.of_node;
1590 ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
1596 gpmi_nfc_exit(this);
1600 static const struct platform_device_id gpmi_ids[] = {
1601 { .name = "imx23-gpmi-nand", .driver_data = IS_MX23, },
1602 { .name = "imx28-gpmi-nand", .driver_data = IS_MX28, },
1603 { .name = "imx6q-gpmi-nand", .driver_data = IS_MX6Q, },
1607 static const struct of_device_id gpmi_nand_id_table[] = {
1609 .compatible = "fsl,imx23-gpmi-nand",
1610 .data = (void *)&gpmi_ids[IS_MX23]
1612 .compatible = "fsl,imx28-gpmi-nand",
1613 .data = (void *)&gpmi_ids[IS_MX28]
1615 .compatible = "fsl,imx6q-gpmi-nand",
1616 .data = (void *)&gpmi_ids[IS_MX6Q]
1619 MODULE_DEVICE_TABLE(of, gpmi_nand_id_table);
1621 static int __devinit gpmi_nand_probe(struct platform_device *pdev)
1623 struct gpmi_nand_data *this;
1624 const struct of_device_id *of_id;
1627 of_id = of_match_device(gpmi_nand_id_table, &pdev->dev);
1629 pdev->id_entry = of_id->data;
1631 pr_err("Failed to find the right device id.\n");
1635 this = kzalloc(sizeof(*this), GFP_KERNEL);
1637 pr_err("Failed to allocate per-device memory\n");
1641 platform_set_drvdata(pdev, this);
1643 this->dev = &pdev->dev;
1645 ret = acquire_resources(this);
1647 goto exit_acquire_resources;
1649 ret = init_hardware(this);
1653 ret = gpmi_nfc_init(this);
1657 dev_info(this->dev, "driver registered.\n");
1662 release_resources(this);
1663 exit_acquire_resources:
1664 platform_set_drvdata(pdev, NULL);
1666 dev_err(this->dev, "driver registration failed: %d\n", ret);
1671 static int __devexit gpmi_nand_remove(struct platform_device *pdev)
1673 struct gpmi_nand_data *this = platform_get_drvdata(pdev);
1675 gpmi_nfc_exit(this);
1676 release_resources(this);
1677 platform_set_drvdata(pdev, NULL);
1682 static struct platform_driver gpmi_nand_driver = {
1684 .name = "gpmi-nand",
1685 .of_match_table = gpmi_nand_id_table,
1687 .probe = gpmi_nand_probe,
1688 .remove = __devexit_p(gpmi_nand_remove),
1689 .id_table = gpmi_ids,
1691 module_platform_driver(gpmi_nand_driver);
1693 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
1694 MODULE_DESCRIPTION("i.MX GPMI NAND Flash Controller Driver");
1695 MODULE_LICENSE("GPL");