mtd: nand: add support for reading ONFI parameters from NAND device

This patch adds support for reading NAND device ONFI parameters and use
the ONFI informations to define its geometry. In case the device supports
ONFI, the onfi_version field in struct nand_chip contains the version (BCD)
and the onfi_params structure can be used by drivers to set up timings and
such. We currently only support ONFI 1.0 parameters.

Signed-off-by: Brian Norris <norris@broadcom.com>
Signed-off-by: Matthieu Castet <matthieu.castet@parrot.com>
Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <ffainelli@freebox.fr>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 29656a3f9331..7666c42235c7 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -228,6 +228,69 @@ typedef enum {
 /* Keep gcc happy */
 struct nand_chip;
 
+struct nand_onfi_params {
+        /* rev info and features block */
+        u8              sig[4]; /* 'O' 'N' 'F' 'I'  */
+        __le16          revision;
+        __le16          features;
+        __le16          opt_cmd;
+        u8              reserved[22];
+
+        /* manufacturer information block */
+        char            manufacturer[12];
+        char            model[20];
+        u8              jedec_id;
+        __le16          date_code;
+        u8              reserved2[13];
+
+        /* memory organization block */
+        __le32          byte_per_page;
+        __le16          spare_bytes_per_page;
+        __le32          data_bytes_per_ppage;
+        __le16          spare_bytes_per_ppage;
+        __le32          pages_per_block;
+        __le32          blocks_per_lun;
+        u8              lun_count;
+        u8              addr_cycles;
+        u8              bits_per_cell;
+        __le16          bb_per_lun;
+        __le16          block_endurance;
+        u8              guaranteed_good_blocks;
+        __le16          guaranteed_block_endurance;
+        u8              programs_per_page;
+        u8              ppage_attr;
+        u8              ecc_bits;
+        u8              interleaved_bits;
+        u8              interleaved_ops;
+        u8              reserved3[13];
+
+        /* electrical parameter block */
+        u8              io_pin_capacitance_max;
+        __le16          async_timing_mode;
+        __le16          program_cache_timing_mode;
+        __le16          t_prog;
+        __le16          t_bers;
+        __le16          t_r;
+        __le16          t_ccs;
+        __le16          src_sync_timing_mode;
+        __le16          src_ssync_features;
+        __le16          clk_pin_capacitance_typ;
+        __le16          io_pin_capacitance_typ;
+        __le16          input_pin_capacitance_typ;
+        u8              input_pin_capacitance_max;
+        u8              driver_strenght_support;
+        __le16          t_int_r;
+        __le16          t_ald;
+        u8              reserved4[7];
+
+        /* vendor */
+        u8              reserved5[90];
+
+        __le16 crc;
+} __attribute__((packed));
+
+#define ONFI_CRC_BASE   0x4F4E
+
 /**
  * struct nand_hw_control - Control structure for hardware controller (e.g ECC generator) shared among independent devices
  * @lock:               protection lock
@@ -360,6 +423,8 @@ struct nand_buffers {
  * @pagemask:           [INTERN] page number mask = number of (pages / chip) - 1
  * @pagebuf:            [INTERN] holds the pagenumber which is currently in data_buf
  * @subpagesize:        [INTERN] holds the subpagesize
+ * @onfi_version:       [INTERN] holds the chip ONFI version (BCD encoded), non 0 if ONFI supported
+ * @onfi_params:        [INTERN] holds the ONFI page parameter when ONFI is supported, 0 otherwise
  * @ecclayout:          [REPLACEABLE] the default ecc placement scheme
  * @bbt:                [INTERN] bad block table pointer
  * @bbt_td:             [REPLACEABLE] bad block table descriptor for flash lookup
@@ -412,6 +477,9 @@ struct nand_chip {
         int             badblockpos;
         int             badblockbits;
 
+        int             onfi_version;
+        struct nand_onfi_params onfi_params;
+
         flstate_t       state;
 
         uint8_t         *oob_poi;