drivers: USB: OHCI: allow compilation for 64-bit targets

OHCI has a known limitation of allowing only 32-bit DMA buffer
addresses, so we have a lot of u32 variables around, which are assigned
to pointers and vice versa. This obviously creates issues with 64-bit
systems, so the compiler complains here and there.
To allow compilation for 64-bit boards which use only memory below 4GB
anyway (and to avoid more invasive fixes), adjust some casts and types
and assume that the EDs and TDs are all located in the lower 4GB.
This fixes compilation of the OHCI driver for the Pine64.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

drivers/usb/host/ohci-hcd.c

@@ -682,7 +682,7 @@ static int ep_link(ohci_t *ohci, ed_t *edi)
 		ed->hwNextED = 0;
 		flush_dcache_ed(ed);
 		if (ohci->ed_controltail == NULL)
-			ohci_writel(ed, &ohci->regs->ed_controlhead);
+			ohci_writel((uintptr_t)ed, &ohci->regs->ed_controlhead);
 		else
 			ohci->ed_controltail->hwNextED =
 						   m32_swap((unsigned long)ed);
@@ -700,7 +700,7 @@ static int ep_link(ohci_t *ohci, ed_t *edi)
 		ed->hwNextED = 0;
 		flush_dcache_ed(ed);
 		if (ohci->ed_bulktail == NULL)
-			ohci_writel(ed, &ohci->regs->ed_bulkhead);
+			ohci_writel((uintptr_t)ed, &ohci->regs->ed_bulkhead);
 		else
 			ohci->ed_bulktail->hwNextED =
 						   m32_swap((unsigned long)ed);
@@ -753,7 +753,7 @@ static void periodic_unlink(struct ohci *ohci, volatile struct ed *ed,
 
 		/* ED might have been unlinked through another path */
 		while (*ed_p != 0) {
-			if (((struct ed *)
+			if (((struct ed *)(uintptr_t)
 					m32_swap((unsigned long)ed_p)) == ed) {
 				*ed_p = ed->hwNextED;
 				aligned_ed_p = (unsigned long)ed_p;
@@ -762,7 +762,7 @@ static void periodic_unlink(struct ohci *ohci, volatile struct ed *ed,
 					aligned_ed_p + ARCH_DMA_MINALIGN);
 				break;
 			}
-			ed_p = &(((struct ed *)
+			ed_p = &(((struct ed *)(uintptr_t)
 				     m32_swap((unsigned long)ed_p))->hwNextED);
 		}
 	}
@@ -798,7 +798,7 @@ static int ep_unlink(ohci_t *ohci, ed_t *edi)
 		if (ohci->ed_controltail == ed) {
 			ohci->ed_controltail = ed->ed_prev;
 		} else {
-			((ed_t *)m32_swap(
+			((ed_t *)(uintptr_t)m32_swap(
 			    *((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
 		}
 		break;
@@ -819,7 +819,7 @@ static int ep_unlink(ohci_t *ohci, ed_t *edi)
 		if (ohci->ed_bulktail == ed) {
 			ohci->ed_bulktail = ed->ed_prev;
 		} else {
-			((ed_t *)m32_swap(
+			((ed_t *)(uintptr_t)m32_swap(
 			     *((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
 		}
 		break;
@@ -914,12 +914,13 @@ static void td_fill(ohci_t *ohci, unsigned int info,
 
 	/* fill the old dummy TD */
 	td = urb_priv->td [index] =
-			     (td_t *)(m32_swap(urb_priv->ed->hwTailP) & ~0xf);
+			     (td_t *)(uintptr_t)
+			     (m32_swap(urb_priv->ed->hwTailP) & ~0xf);
 
 	td->ed = urb_priv->ed;
 	td->next_dl_td = NULL;
 	td->index = index;
-	td->data = (__u32)data;
+	td->data = (uintptr_t)data;
 #ifdef OHCI_FILL_TRACE
 	if (usb_pipebulk(urb_priv->pipe) && usb_pipeout(urb_priv->pipe)) {
 		for (i = 0; i < len; i++)
@@ -1099,7 +1100,7 @@ static void check_status(td_t *td_list)
  * we reverse the reversed done-list */
 static td_t *dl_reverse_done_list(ohci_t *ohci)
 {
-	__u32 td_list_hc;
+	uintptr_t td_list_hc;
 	td_t *td_rev = NULL;
 	td_t *td_list = NULL;
 
@@ -1862,7 +1863,7 @@ static int hc_start(ohci_t *ohci)
 	ohci_writel(0, &ohci->regs->ed_controlhead);
 	ohci_writel(0, &ohci->regs->ed_bulkhead);
 
-	ohci_writel((__u32)ohci->hcca,
+	ohci_writel((uintptr_t)ohci->hcca,
 		    &ohci->regs->hcca); /* reset clears this */
 
 	fminterval = 0x2edf;

drivers/usb/host/ohci-sunxi.c

@@ -51,7 +51,7 @@ static int ohci_usb_probe(struct udevice *dev)
 	extra_ahb_gate_mask = 1 << AHB_GATE_OFFSET_USB_EHCI0;
 #endif
 	priv->usb_gate_mask = CCM_USB_CTRL_OHCI0_CLK;
-	priv->phy_index = ((u32)regs - (SUNXI_USB1_BASE + 0x400)) / BASE_DIST;
+	priv->phy_index = ((uintptr_t)regs - (SUNXI_USB1_BASE + 0x400)) / BASE_DIST;
 	priv->ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
 	extra_ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
 	priv->usb_gate_mask <<= priv->phy_index;

drivers/usb/host/ohci.h

@@ -10,12 +10,15 @@
 /*
  * e.g. PCI controllers need this
  */
+
+#include <asm/io.h>
+
 #ifdef CONFIG_SYS_OHCI_SWAP_REG_ACCESS
-# define ohci_readl(a) __swap_32(*((volatile u32 *)(a)))
-# define ohci_writel(a, b) (*((volatile u32 *)(b)) = __swap_32((volatile u32)a))
+# define ohci_readl(a) __swap_32(readl(a))
+# define ohci_writel(v, a) writel(__swap_32(v), a)
 #else
-# define ohci_readl(a) (*((volatile u32 *)(a)))
-# define ohci_writel(a, b) (*((volatile u32 *)(b)) = ((volatile u32)a))
+# define ohci_readl(a) readl(a)
+# define ohci_writel(v, a) writel(v, a)
 #endif /* CONFIG_SYS_OHCI_SWAP_REG_ACCESS */
 
 #if ARCH_DMA_MINALIGN > 16