mtd: bcm47xxsflash: implement ChipCommon R/W ops

They are needed for erasing/writing. Use a magic pointers and small
functions to prepare code for adding other buses support in the future
(like SSB).

Signed-off-by: Rafał Miłecki <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/devices/bcm47xxsflash.c

···
  * BCMA
  **************************************************/
 
+static int bcm47xxsflash_bcma_cc_read(struct bcm47xxsflash *b47s, u16 offset)
+{
+	return bcma_cc_read32(b47s->bcma_cc, offset);
+}
+
+static void bcm47xxsflash_bcma_cc_write(struct bcm47xxsflash *b47s, u16 offset,
+					u32 value)
+{
+	bcma_cc_write32(b47s->bcma_cc, offset, value);
+}
+
 static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
 {
 	struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
···
 	sflash->priv = b47s;
 
 	b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
+	b47s->cc_read = bcm47xxsflash_bcma_cc_read;
+	b47s->cc_write = bcm47xxsflash_bcma_cc_write;
 
 	switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) {
 	case BCMA_CC_FLASHT_STSER:

drivers/mtd/devices/bcm47xxsflash.h

···
 
 struct bcm47xxsflash {
 	struct bcma_drv_cc *bcma_cc;
+	int (*cc_read)(struct bcm47xxsflash *b47s, u16 offset);
+	void (*cc_write)(struct bcm47xxsflash *b47s, u16 offset, u32 value);
 
 	enum bcm47xxsflash_type type;