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mtd: gpmi: allocate a proper buffer for non ECC read/write 

The @data_buffer_dma buffer is used for non ECC read/write.

Currently, the length of the buffer is PAGE_SIZE, but the NAND chip may
has 8K page or 16K page. So we have to extend it for the large page NAND
chips.

The gpmi_alloc_dma_buffer will be called twice. The first time is to
allocate a temporary buffer for scanning the NAND chip; The second time
is to allocate a buffer to store the real page content.

This patch allocates a buffer of PAGE_SIZE size for scanning the NAND
chip when gpmi_alloc_dma_buffer is called the first time, and allocates a
buffer of the real NAND page size for the second time gpmi_alloc_dma_buffer
is called.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2013-12-18 23:40:59 +08:00 committed by Brian Norris
parent 464e906737
commit 06f216c83c
1 changed files with 11 additions and 2 deletions
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13
drivers/mtd/nand/gpmi-nand/gpmi-nand.c
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@ -783,14 +783,23 @@ static int gpmi_alloc_dma_buffer(struct gpmi_nand_data *this)
{
struct bch_geometry *geo = &this->bch_geometry;
struct device *dev = this->dev;
struct mtd_info *mtd = &this->mtd;
/* [1] Allocate a command buffer. PAGE_SIZE is enough. */
this->cmd_buffer = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
if (this->cmd_buffer == NULL)
goto error_alloc;
/* [2] Allocate a read/write data buffer. PAGE_SIZE is enough. */
this->data_buffer_dma = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
/*
* [2] Allocate a read/write data buffer.
* The gpmi_alloc_dma_buffer can be called twice.
* We allocate a PAGE_SIZE length buffer if gpmi_alloc_dma_buffer
* is called before the nand_scan_ident; and we allocate a buffer
* of the real NAND page size when the gpmi_alloc_dma_buffer is
* called after the nand_scan_ident.
*/
this->data_buffer_dma = kzalloc(mtd->writesize ?: PAGE_SIZE,
GFP_DMA | GFP_KERNEL);
if (this->data_buffer_dma == NULL)
goto error_alloc;