mtd: gpmi: add gpmi support for imx6sx

The gpmi's IP for imx6sx is nearly the same as the gpmi's IP for imx6q,
except the following two new features:

     (1) the new BCH contoller has 62-BIT correcting ECC strength
            (The BCH for imx6q only has 40-BIT ECC strength).

     (2) add the hardware Randomizer support.

This patch does the follow changes:

     (1) add a new macro GPMI_IS_MX6SX to represent the imx6sx's gpmi.

     (2) add a new macro GPMI_IS_MX6.
           We use this macro to initialize the same registers for both
         imx6sx and imx6q, and so on.

     (3) add a new gpmi_devdata instance, the gpmi_devdata_imx6sx, for
         imx6sx.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

4 files changed, 28 insertions, 15 deletions

diff --git a/drivers/mtd/nand/gpmi-nand/bch-regs.h b/drivers/mtd/nand/gpmi-nand/bch-regs.h
index 588f5374047c..05bb91f2f4c4 100644
--- a/drivers/mtd/nand/gpmi-nand/bch-regs.h
+++ b/drivers/mtd/nand/gpmi-nand/bch-regs.h
@@ -54,7 +54,7 @@
 #define MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0          11
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0  (0x1f << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)
 #define BF_BCH_FLASH0LAYOUT0_ECC0(v, x)                         \
-        (GPMI_IS_MX6Q(x)                                        \
+        (GPMI_IS_MX6(x)                                 \
                 ? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT0_ECC0)      \
                         & MX6Q_BM_BCH_FLASH0LAYOUT0_ECC0)       \
                 : (((v) << BP_BCH_FLASH0LAYOUT0_ECC0)           \
@@ -65,7 +65,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14                      \
                                 (0x1 << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)
 #define BF_BCH_FLASH0LAYOUT0_GF(v, x)                           \
-        ((GPMI_IS_MX6Q(x) && ((v) == 14))                       \
+        ((GPMI_IS_MX6(x) && ((v) == 14))                        \
                 ? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT0_GF_13_14)  \
                         & MX6Q_BM_BCH_FLASH0LAYOUT0_GF_13_14)   \
                 : 0                                             \
@@ -77,7 +77,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE    \
                         (0x3ff << BP_BCH_FLASH0LAYOUT0_DATA0_SIZE)
 #define BF_BCH_FLASH0LAYOUT0_DATA0_SIZE(v, x)                           \
-        (GPMI_IS_MX6Q(x)                                                \
+        (GPMI_IS_MX6(x)                                         \
                 ? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)   \
                 : ((v) & BM_BCH_FLASH0LAYOUT0_DATA0_SIZE)               \
         )
@@ -96,7 +96,7 @@
 #define MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN          11
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN  (0x1f << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)
 #define BF_BCH_FLASH0LAYOUT1_ECCN(v, x)                         \
-        (GPMI_IS_MX6Q(x)                                        \
+        (GPMI_IS_MX6(x)                                 \
                 ? (((v) << MX6Q_BP_BCH_FLASH0LAYOUT1_ECCN)      \
                         & MX6Q_BM_BCH_FLASH0LAYOUT1_ECCN)       \
                 : (((v) << BP_BCH_FLASH0LAYOUT1_ECCN)           \
@@ -107,7 +107,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14                      \
                                 (0x1 << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)
 #define BF_BCH_FLASH0LAYOUT1_GF(v, x)                           \
-        ((GPMI_IS_MX6Q(x) && ((v) == 14))                       \
+        ((GPMI_IS_MX6(x) && ((v) == 14))                        \
                 ? (((1) << MX6Q_BP_BCH_FLASH0LAYOUT1_GF_13_14)  \
                         & MX6Q_BM_BCH_FLASH0LAYOUT1_GF_13_14)   \
                 : 0                                             \
@@ -119,7 +119,7 @@
 #define MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE    \
                         (0x3ff << BP_BCH_FLASH0LAYOUT1_DATAN_SIZE)
 #define BF_BCH_FLASH0LAYOUT1_DATAN_SIZE(v, x)                           \
-        (GPMI_IS_MX6Q(x)                                                \
+        (GPMI_IS_MX6(x)                                         \
                 ? (((v) >> 2) & MX6Q_BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)   \
                 : ((v) & BM_BCH_FLASH0LAYOUT1_DATAN_SIZE)               \
         )
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index ec4db2a359e5..87e658ce23ef 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -971,7 +971,7 @@ int gpmi_extra_init(struct gpmi_nand_data *this)
         struct nand_chip *chip = &this->nand;
 
         /* Enable the asynchronous EDO feature. */
-        if (GPMI_IS_MX6Q(this) && chip->onfi_version) {
+        if (GPMI_IS_MX6(this) && chip->onfi_version) {
                 int mode = onfi_get_async_timing_mode(chip);
 
                 /* We only support the timing mode 4 and mode 5. */
@@ -1093,12 +1093,12 @@ int gpmi_is_ready(struct gpmi_nand_data *this, unsigned chip)
         if (GPMI_IS_MX23(this)) {
                 mask = MX23_BM_GPMI_DEBUG_READY0 << chip;
                 reg = readl(r->gpmi_regs + HW_GPMI_DEBUG);
-        } else if (GPMI_IS_MX28(this) || GPMI_IS_MX6Q(this)) {
+        } else if (GPMI_IS_MX28(this) || GPMI_IS_MX6(this)) {
                 /*
                  * In the imx6, all the ready/busy pins are bound
                  * together. So we only need to check chip 0.
                  */
-                if (GPMI_IS_MX6Q(this))
+                if (GPMI_IS_MX6(this))
                         chip = 0;
 
                 /* MX28 shares the same R/B register as MX6Q. */
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index e88d64e1e963..f638cd8077ca 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -71,6 +71,12 @@ static const struct gpmi_devdata gpmi_devdata_imx6q = {
         .max_chain_delay = 12,
 };
 
+static const struct gpmi_devdata gpmi_devdata_imx6sx = {
+        .type = IS_MX6SX,
+        .bch_max_ecc_strength = 62,
+        .max_chain_delay = 12,
+};
+
 static irqreturn_t bch_irq(int irq, void *cookie)
 {
         struct gpmi_nand_data *this = cookie;
@@ -583,7 +589,7 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
         }
 
         /* Get extra clocks */
-        if (GPMI_IS_MX6Q(this))
+        if (GPMI_IS_MX6(this))
                 extra_clks = extra_clks_for_mx6q;
         if (!extra_clks)
                 return 0;
@@ -601,9 +607,9 @@ static int gpmi_get_clks(struct gpmi_nand_data *this)
                 r->clock[i] = clk;
         }
 
-        if (GPMI_IS_MX6Q(this))
+        if (GPMI_IS_MX6(this))
                 /*
-                 * Set the default value for the gpmi clock in mx6q:
+                 * Set the default value for the gpmi clock.
                  *
                  * If you want to use the ONFI nand which is in the
                  * Synchronous Mode, you should change the clock as you need.
@@ -1666,7 +1672,7 @@ static int gpmi_init_last(struct gpmi_nand_data *this)
          *  (1) the chip is imx6, and
          *  (2) the size of the ECC parity is byte aligned.
          */
-        if (GPMI_IS_MX6Q(this) &&
+        if (GPMI_IS_MX6(this) &&
                 ((bch_geo->gf_len * bch_geo->ecc_strength) % 8) == 0) {
                 ecc->read_subpage = gpmi_ecc_read_subpage;
                 chip->options |= NAND_SUBPAGE_READ;
@@ -1722,7 +1728,7 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
         if (ret)
                 goto err_out;
 
-        ret = nand_scan_ident(mtd, GPMI_IS_MX6Q(this) ? 2 : 1, NULL);
+        ret = nand_scan_ident(mtd, GPMI_IS_MX6(this) ? 2 : 1, NULL);
         if (ret)
                 goto err_out;
 
@@ -1761,6 +1767,9 @@ static const struct of_device_id gpmi_nand_id_table[] = {
         }, {
                 .compatible = "fsl,imx6q-gpmi-nand",
                 .data = (void *)&gpmi_devdata_imx6q,
+        }, {
+                .compatible = "fsl,imx6sx-gpmi-nand",
+                .data = (void *)&gpmi_devdata_imx6sx,
         }, {}
 };
 MODULE_DEVICE_TABLE(of, gpmi_nand_id_table);
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 7904e8329b67..32c6ba49f986 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -122,7 +122,8 @@ struct nand_timing {
 enum gpmi_type {
         IS_MX23,
         IS_MX28,
-        IS_MX6Q
+        IS_MX6Q,
+        IS_MX6SX
 };
 
 struct gpmi_devdata {
@@ -298,4 +299,7 @@ extern int gpmi_read_page(struct gpmi_nand_data *,
 #define GPMI_IS_MX23(x)         ((x)->devdata->type == IS_MX23)
 #define GPMI_IS_MX28(x)         ((x)->devdata->type == IS_MX28)
 #define GPMI_IS_MX6Q(x)         ((x)->devdata->type == IS_MX6Q)
+#define GPMI_IS_MX6SX(x)        ((x)->devdata->type == IS_MX6SX)
+
+#define GPMI_IS_MX6(x)          (GPMI_IS_MX6Q(x) || GPMI_IS_MX6SX(x))
 #endif