onenand_spl_simple: Add DDP OneNAND support

Current implementation is unable to access second half of
DDP OneNAND flash (reads first half mirrored). Use block
and bufferram address calculations from onenand_base to
fix this.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>

diff --git a/drivers/mtd/onenand/onenand_spl.c b/drivers/mtd/onenand/onenand_spl.c
index 6fad34a..0b78067 100644 (file)
--- a/drivers/mtd/onenand/onenand_spl.c
+++ b/drivers/mtd/onenand/onenand_spl.c
@@ -23,11 +23,29 @@ enum onenand_spl_pagesize {
        PAGE_4K = 4096,
 };
 
+static unsigned int density_mask;
+
 #define ONENAND_PAGES_PER_BLOCK                        64
-#define onenand_block_address(block)           (block)
 #define onenand_sector_address(page)           (page << 2)
 #define onenand_buffer_address()               ((1 << 3) << 8)
-#define onenand_bufferram_address(block)       (0)
+
+static inline int onenand_block_address(int block)
+{
+       /* Device Flash Core select, NAND Flash Block Address */
+       if (block & density_mask)
+               return ONENAND_DDP_CHIP1 | (block ^ density_mask);
+
+       return block;
+}
+
+static inline int onenand_bufferram_address(int block)
+{
+       /* Device BufferRAM Select */
+       if (block & density_mask)
+               return ONENAND_DDP_CHIP1;
+
+       return ONENAND_DDP_CHIP0;
+}
 
 static inline uint16_t onenand_readw(uint32_t addr)
 {
@@ -41,7 +59,7 @@ static inline void onenand_writew(uint16_t value, uint32_t addr)
 
 static enum onenand_spl_pagesize onenand_spl_get_geometry(void)
 {
-       uint32_t dev_id, density;
+       unsigned int dev_id, density, size;
 
        if (!onenand_readw(ONENAND_REG_TECHNOLOGY)) {
                dev_id = onenand_readw(ONENAND_REG_DEVICE_ID);
@@ -51,8 +69,11 @@ static enum onenand_spl_pagesize onenand_spl_get_geometry(void)
                if (density < ONENAND_DEVICE_DENSITY_4Gb)
                        return PAGE_2K;
 
-               if (dev_id & ONENAND_DEVICE_IS_DDP)
+               if (dev_id & ONENAND_DEVICE_IS_DDP) {
+                       size = onenand_readw(ONENAND_REG_DATA_BUFFER_SIZE);
+                       density_mask = 1 << (18 + density - ffs(size));
                        return PAGE_2K;
+               }
        }
 
        return PAGE_4K;