mtd: nand: Pass the CS line to ->setup_data_interface()

Some NAND controllers can assign different NAND timings to different
CS lines. Pass the CS line information to ->setup_data_interface() so
that the NAND controller driver knows which CS line is concerned by
the setup_data_interface() request.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[Linux commit: 104e442a67cfba4d0cc982384761befb917fb6a1]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index f3c515b..e490c84 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -904,12 +904,13 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 /**
  * nand_reset_data_interface - Reset data interface and timings
  * @chip: The NAND chip
+ * @chipnr: Internal die id
  *
  * Reset the Data interface and timings to ONFI mode 0.
  *
  * Returns 0 for success or negative error code otherwise.
  */
-static int nand_reset_data_interface(struct nand_chip *chip)
+static int nand_reset_data_interface(struct nand_chip *chip, int chipnr)
 {
        struct mtd_info *mtd = nand_to_mtd(chip);
        const struct nand_data_interface *conf;
@@ -933,7 +934,7 @@ static int nand_reset_data_interface(struct nand_chip *chip)
         */
 
        conf = nand_get_default_data_interface();
-       ret = chip->setup_data_interface(mtd, conf, false);
+       ret = chip->setup_data_interface(mtd, chipnr, conf);
        if (ret)
                pr_err("Failed to configure data interface to SDR timing mode 0\n");
 
@@ -943,6 +944,7 @@ static int nand_reset_data_interface(struct nand_chip *chip)
 /**
  * nand_setup_data_interface - Setup the best data interface and timings
  * @chip: The NAND chip
+ * @chipnr: Internal die id
  *
  * Find and configure the best data interface and NAND timings supported by
  * the chip and the driver.
@@ -952,7 +954,7 @@ static int nand_reset_data_interface(struct nand_chip *chip)
  *
  * Returns 0 for success or negative error code otherwise.
  */
-static int nand_setup_data_interface(struct nand_chip *chip)
+static int nand_setup_data_interface(struct nand_chip *chip, int chipnr)
 {
        struct mtd_info *mtd = nand_to_mtd(chip);
        int ret;
@@ -976,7 +978,7 @@ static int nand_setup_data_interface(struct nand_chip *chip)
                        goto err;
        }
 
-       ret = chip->setup_data_interface(mtd, chip->data_interface, false);
+       ret = chip->setup_data_interface(mtd, chipnr, chip->data_interface);
 err:
        return ret;
 }
@@ -1027,8 +1029,10 @@ static int nand_init_data_interface(struct nand_chip *chip)
                if (ret)
                        continue;
 
-               ret = chip->setup_data_interface(mtd, chip->data_interface,
-                                                true);
+               /* Pass -1 to only */
+               ret = chip->setup_data_interface(mtd,
+                                                NAND_DATA_IFACE_CHECK_ONLY,
+                                                chip->data_interface);
                if (!ret) {
                        chip->onfi_timing_mode_default = mode;
                        break;
@@ -1055,7 +1059,7 @@ int nand_reset(struct nand_chip *chip, int chipnr)
        struct mtd_info *mtd = nand_to_mtd(chip);
        int ret;
 
-       ret = nand_reset_data_interface(chip);
+       ret = nand_reset_data_interface(chip, chipnr);
        if (ret)
                return ret;
 
@@ -1068,7 +1072,7 @@ int nand_reset(struct nand_chip *chip, int chipnr)
        chip->select_chip(mtd, -1);
 
        chip->select_chip(mtd, chipnr);
-       ret = nand_setup_data_interface(chip);
+       ret = nand_setup_data_interface(chip, chipnr);
        chip->select_chip(mtd, -1);
        if (ret)
                return ret;
@@ -4037,7 +4041,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
         * For the other dies, nand_reset() will automatically switch to the
         * best mode for us.
         */
-       ret = nand_setup_data_interface(chip);
+       ret = nand_setup_data_interface(chip, 0);
        if (ret)
                return ret;
 

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 90c6010..b1a6648 100644 (file)
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -124,6 +124,8 @@ void nand_wait_ready(struct mtd_info *mtd);
 #define NAND_STATUS_READY      0x40
 #define NAND_STATUS_WP         0x80
 
+#define NAND_DATA_IFACE_CHECK_ONLY     -1
+
 /*
  * Constants for ECC_MODES
  */
@@ -807,7 +809,10 @@ nand_get_sdr_timings(const struct nand_data_interface *conf)
  * @read_retries:      [INTERN] the number of read retry modes supported
  * @onfi_set_features: [REPLACEABLE] set the features for ONFI nand
  * @onfi_get_features: [REPLACEABLE] get the features for ONFI nand
- * @setup_data_interface: [OPTIONAL] setup the data interface and timing
+ * @setup_data_interface: [OPTIONAL] setup the data interface and timing. If
+ *                       chipnr is set to %NAND_DATA_IFACE_CHECK_ONLY this
+ *                       means the configuration should not be applied but
+ *                       only checked.
  * @bbt:               [INTERN] bad block table pointer
  * @bbt_td:            [REPLACEABLE] bad block table descriptor for flash
  *                     lookup.
@@ -851,9 +856,8 @@ struct nand_chip {
        int (*onfi_get_features)(struct mtd_info *mtd, struct nand_chip *chip,
                        int feature_addr, uint8_t *subfeature_para);
        int (*setup_read_retry)(struct mtd_info *mtd, int retry_mode);
-       int (*setup_data_interface)(struct mtd_info *mtd,
-                                   const struct nand_data_interface *conf,
-                                   bool check_only);
+       int (*setup_data_interface)(struct mtd_info *mtd, int chipnr,
+                                   const struct nand_data_interface *conf);
 
 
        int chip_delay;