spi/bcm63xx: replace custom io accessors with standard ones

Replace all bcm_read* with (io)read. Due to this block following
system endianness, make sure we match that.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm63xx.c

@@ -56,25 +56,33 @@ struct bcm63xx_spi {
 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
 				unsigned int offset)
 {
-	return bcm_readb(bs->regs + bcm63xx_spireg(offset));
+	return readb(bs->regs + bcm63xx_spireg(offset));
 }
 
 static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs,
 				unsigned int offset)
 {
-	return bcm_readw(bs->regs + bcm63xx_spireg(offset));
+#ifdef CONFIG_BIG_ENDIAN
+	return ioread16(bs->regs + bcm63xx_spireg(offset));
+#else
+	return readw(bs->regs + bcm63xx_spireg(offset));
+#endif
 }
 
 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
 				  u8 value, unsigned int offset)
 {
-	bcm_writeb(value, bs->regs + bcm63xx_spireg(offset));
+	writeb(value, bs->regs + bcm63xx_spireg(offset));
 }
 
 static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
 				  u16 value, unsigned int offset)
 {
-	bcm_writew(value, bs->regs + bcm63xx_spireg(offset));
+#ifdef CONFIG_BIG_ENDIAN
+	iowrite16(value, bs->regs + bcm63xx_spireg(offset));
+#else
+	writew(value, bs->regs + bcm63xx_spireg(offset));
+#endif
 }
 
 static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = {