mtd: rawnand: cs553x: Declare controllers instead of NAND chips

The CS553x companion chip embeds 4 NAND controllers. Declare them as
NAND controllers instead of NAND chips. That's done in preparation
of the transition to exec_op().

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200501090650.1138200-2-boris.brezillon@collabora.com

diff --git a/drivers/mtd/nand/raw/cs553x_nand.c b/drivers/mtd/nand/raw/cs553x_nand.c
index e2322ce..970de72 100644 (file)
--- a/drivers/mtd/nand/raw/cs553x_nand.c
+++ b/drivers/mtd/nand/raw/cs553x_nand.c
@@ -89,6 +89,11 @@
 #define CS_NAND_ECC_CLRECC     (1<<1)
 #define CS_NAND_ECC_ENECC      (1<<0)
 
+struct cs553x_nand_controller {
+       struct nand_controller base;
+       struct nand_chip chip;
+};
+
 static void cs553x_read_buf(struct nand_chip *this, u_char *buf, int len)
 {
        while (unlikely(len > 0x800)) {
@@ -166,10 +171,11 @@ static int cs_calculate_ecc(struct nand_chip *this, const u_char *dat,
        return 0;
 }
 
-static struct mtd_info *cs553x_mtd[4];
+static struct cs553x_nand_controller *controllers[4];
 
 static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
 {
+       struct cs553x_nand_controller *controller;
        int err = 0;
        struct nand_chip *this;
        struct mtd_info *new_mtd;
@@ -183,12 +189,15 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
        }
 
        /* Allocate memory for MTD device structure and private data */
-       this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
-       if (!this) {
+       controller = kzalloc(sizeof(*controller), GFP_KERNEL);
+       if (!controller) {
                err = -ENOMEM;
                goto out;
        }
 
+       this = &controller->chip;
+       nand_controller_init(&controller->base);
+       this->controller = &controller->base;
        new_mtd = nand_to_mtd(this);
 
        /* Link the private data with the MTD structure */
@@ -232,7 +241,7 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
        if (err)
                goto out_free;
 
-       cs553x_mtd[cs] = new_mtd;
+       controllers[cs] = controller;
        goto out;
 
 out_free:
@@ -240,7 +249,7 @@ out_free:
 out_ior:
        iounmap(this->legacy.IO_ADDR_R);
 out_mtd:
-       kfree(this);
+       kfree(controller);
 out:
        return err;
 }
@@ -295,9 +304,10 @@ static int __init cs553x_init(void)
        /* Register all devices together here. This means we can easily hack it to
           do mtdconcat etc. if we want to. */
        for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
-               if (cs553x_mtd[i]) {
+               if (controllers[i]) {
                        /* If any devices registered, return success. Else the last error. */
-                       mtd_device_register(cs553x_mtd[i], NULL, 0);
+                       mtd_device_register(nand_to_mtd(&controllers[i]->chip),
+                                           NULL, 0);
                        err = 0;
                }
        }
@@ -312,9 +322,10 @@ static void __exit cs553x_cleanup(void)
        int i;
 
        for (i = 0; i < NR_CS553X_CONTROLLERS; i++) {
-               struct mtd_info *mtd = cs553x_mtd[i];
-               struct nand_chip *this;
                void __iomem *mmio_base;
+               struct cs553x_nand_controller *controller = controllers[i];
+               struct nand_chip *this = &controller->chip;
+               struct mtd_info *mtd = nand_to_mtd(this);
 
                if (!mtd)
                        continue;
@@ -325,13 +336,13 @@ static void __exit cs553x_cleanup(void)
                /* Release resources, unregister device */
                nand_release(this);
                kfree(mtd->name);
-               cs553x_mtd[i] = NULL;
+               controllers[i] = NULL;
 
                /* unmap physical address */
                iounmap(mmio_base);
 
                /* Free the MTD device structure */
-               kfree(this);
+               kfree(controller);
        }
 }