dma: omap: hide legacy interface

The legacy interface for omap-dma is only used on OMAP1, and the
same is true for the non-DT case. Make both of these conditional on
CONFIG_ARCH_OMAP1 being set to simplify the dependency.

The non-OMAP stub functions in include/linux/omap-dma.h are note needed
any more either now, because they are only called on OMAP1.

Acked-by: Tony Lindgren <[e-mail]>
Acked-By: Vinod Koul <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/dma/ti/omap-dma.c

···
 	mutex_unlock(&od->lch_lock);
 }
 
+static inline bool omap_dma_legacy(struct omap_dmadev *od)
+{
+	return IS_ENABLED(CONFIG_ARCH_OMAP1) && od->legacy;
+}
+
 static int omap_dma_alloc_chan_resources(struct dma_chan *chan)
 {
 	struct omap_dmadev *od = to_omap_dma_dev(chan->device);
···
 	struct device *dev = od->ddev.dev;
 	int ret;
 
-	if (od->legacy) {
+	if (omap_dma_legacy(od)) {
 		ret = omap_request_dma(c->dma_sig, "DMA engine",
 				       omap_dma_callback, c, &c->dma_ch);
 	} else {
···
 	if (ret >= 0) {
 		omap_dma_assign(od, c, c->dma_ch);
 
-		if (!od->legacy) {
+		if (!omap_dma_legacy(od)) {
 			unsigned val;
 
 			spin_lock_irq(&od->irq_lock);
···
 	struct omap_dmadev *od = to_omap_dma_dev(chan->device);
 	struct omap_chan *c = to_omap_dma_chan(chan);
 
-	if (!od->legacy) {
+	if (!omap_dma_legacy(od)) {
 		spin_lock_irq(&od->irq_lock);
 		od->irq_enable_mask &= ~BIT(c->dma_ch);
 		omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask);
···
 	od->lch_map[c->dma_ch] = NULL;
 	vchan_free_chan_resources(&c->vc);
 
-	if (od->legacy)
+	if (omap_dma_legacy(od))
 		omap_free_dma(c->dma_ch);
 	else
 		omap_dma_put_lch(od, c->dma_ch);
···
 			dev_err(&pdev->dev, "omap_system_dma_plat_info is missing");
 			return -ENODEV;
 		}
-	} else {
+	} else if (IS_ENABLED(CONFIG_ARCH_OMAP1)) {
 		od->cfg = &default_cfg;
 
 		od->plat = omap_get_plat_info();
 		if (!od->plat)
 			return -EPROBE_DEFER;
+	} else {
+		return -ENODEV;
 	}
 
 	od->reg_map = od->plat->reg_map;
···
 
 	dma_async_device_unregister(&od->ddev);
 
-	if (!od->legacy) {
+	if (!omap_dma_legacy(od)) {
 		/* Disable all interrupts */
 		omap_dma_glbl_write(od, IRQENABLE_L0, 0);
 	}

include/linux/omap-dma.h

···
 #define dma_omap15xx()	__dma_omap15xx(d)
 #define dma_omap16xx()	__dma_omap16xx(d)
 
-#if defined(CONFIG_ARCH_OMAP)
 extern struct omap_system_dma_plat_info *omap_get_plat_info(void);
 
 extern void omap_set_dma_priority(int lch, int dst_port, int priority);
···
 	return 0;
 }
 #endif
-
-#else /* CONFIG_ARCH_OMAP */
-static inline void omap_set_dma_priority(int lch, int dst_port, int priority)
-{
-}
-
-static inline struct omap_system_dma_plat_info *omap_get_plat_info(void)
-{
-	return NULL;
-}
-
-static inline int omap_request_dma(int dev_id, const char *dev_name,
-			void (*callback)(int lch, u16 ch_status, void *data),
-			void *data, int *dma_ch)
-{
-	return -ENODEV;
-}
-
-static inline void omap_free_dma(int ch) { }
-
-#endif /* CONFIG_ARCH_OMAP */
 
 #endif /* __LINUX_OMAP_DMA_H */