Use DMA to write a single page of data.
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 76 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 72c9734..e875446 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -606,6 +606,81 @@ static int bch_read(struct mtd_info *mtd, struct nand_chip
*chip,
return ret;
}
+/* Returns the status of the NAND device following the write operation */
+static uint8_t bch_write_page(struct nandi_controller *nandi,
+ loff_t offs, const uint8_t *buf)
+{
+ struct bch_prog *prog = &bch_prog_write_page;
+ uint32_t page_size = nandi->info.mtd.writesize;
+ uint8_t *p = (uint8_t *)buf;
+ unsigned long list_phys;
+ unsigned long buf_phys;
+ uint8_t status;
+ bool bounce = false;
+
+ dev_dbg(nandi->dev, "%s: offs = 0x%012llx\n", __func__, offs);
+
+ BUG_ON(offs & (page_size - 1));
+
+ if (((unsigned long)buf & (NANDI_BCH_DMA_ALIGNMENT - 1)) ||
+ !virt_addr_valid(buf)) { /* vmalloc'd buffer! */
+ bounce = true;
+ }
+
+ if (bounce) {
+ memcpy(nandi->page_buf, buf, page_size);
+ p = nandi->page_buf;
+ nandi->cached_page = -1;
+ }
+
+ emiss_nandi_select(STM_NANDI_BCH);
+
+ nandi_enable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+ reinit_completion(&nandi->seq_completed);
+
+ prog->addr = (uint32_t)((offs >> (nandi->page_shift - 8)) & 0xffffff00);
+
+ buf_phys = dma_map_single(NULL, p, page_size, DMA_TO_DEVICE);
+ memset(nandi->buf_list, 0x00, NANDI_BCH_BUF_LIST_SIZE);
+ nandi->buf_list[0] = buf_phys | (nandi->sectors_per_page - 1);
+
+ list_phys = dma_map_single(NULL, nandi->buf_list,
+ NANDI_BCH_BUF_LIST_SIZE, DMA_TO_DEVICE);
+
+ writel(list_phys, nandi->base + NANDBCH_BUFFER_LIST_PTR);
+
+ bch_load_prog_cpu(nandi, prog);
+
+ bch_wait_seq(nandi);
+
+ nandi_disable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER);
+
+ dma_unmap_single(NULL, list_phys, NANDI_BCH_BUF_LIST_SIZE,
+ DMA_TO_DEVICE);
+ dma_unmap_single(NULL, buf_phys, page_size, DMA_FROM_DEVICE);
+
+ status = (uint8_t)(readl(nandi->base +
+ NANDBCH_CHECK_STATUS_REG_A) & 0xff);
+
+ return status;
+}
+
+static int bch_write(struct mtd_info *mtd, struct nand_chip *chip,
+ uint32_t offset, int data_len, const uint8_t *buf,
+ int oob_required, int page, int cached, int raw)
+{
+ struct nandi_controller *nandi = chip->priv;
+ uint32_t page_size = mtd->writesize;
+ loff_t offs = page * page_size;
+ int ret;
+
+ ret = bch_write_page(nandi, offs, buf);
+ if (ret & NAND_STATUS_FAIL)
+ return -EIO;
+
+ return 0;
+}
+
/*
* Initialisation
*/
@@ -686,6 +761,7 @@ static void nandi_set_mtd_defaults(struct nandi_controller
*nandi,
mtd->subpage_sft = 0;
chip->ecc.read_page = bch_read;
+ chip->write_page = bch_write;
}
/*
--
1.8.3.2
--
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