NTB: Enable 32bit Support

Correct the issues on NTB that prevented it from working on x86_32 and
modify the Kconfig to allow it to be permitted to be used in that
environment as well.

Signed-off-by: Jon Mason <jon.mason@intel.com>

drivers/ntb/Kconfig

@@ -1,7 +1,7 @@
 config NTB
        tristate "Intel Non-Transparent Bridge support"
        depends on PCI
-       depends on X86_64
+       depends on X86
        help
         The PCI-E Non-transparent bridge hardware is a point-to-point PCI-E bus
         connecting 2 systems.  When configured, writes to the device's PCI

drivers/ntb/ntb_hw.c

@@ -376,7 +376,7 @@ void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw)
  *
  * RETURNS: the size of the memory window or zero on error
  */
-resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
+u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw)
 {
 	if (mw >= ntb_max_mw(ndev))
 		return 0;
@@ -1257,7 +1257,7 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		    ioremap_wc(pci_resource_start(pdev, MW_TO_BAR(i)),
 			       ndev->mw[i].bar_sz);
 		dev_info(&pdev->dev, "MW %d size %llu\n", i,
-			 pci_resource_len(pdev, MW_TO_BAR(i)));
+			 (unsigned long long) ndev->mw[i].bar_sz);
 		if (!ndev->mw[i].vbase) {
 			dev_warn(&pdev->dev, "Cannot remap BAR %d\n",
 				 MW_TO_BAR(i));

drivers/ntb/ntb_hw.h

@@ -62,6 +62,21 @@
 
 #define msix_table_size(control)	((control & PCI_MSIX_FLAGS_QSIZE)+1)
 
+#ifndef readq
+static inline u64 readq(void __iomem *addr)
+{
+	return readl(addr) | (((u64) readl(addr + 4)) << 32LL);
+}
+#endif
+
+#ifndef writeq
+static inline void writeq(u64 val, void __iomem *addr)
+{
+	writel(val & 0xffffffff, addr);
+	writel(val >> 32, addr + 4);
+}
+#endif
+
 #define NTB_BAR_MMIO		0
 #define NTB_BAR_23		2
 #define NTB_BAR_45		4
@@ -226,7 +241,7 @@ int ntb_read_local_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
 int ntb_write_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 val);
 int ntb_read_remote_spad(struct ntb_device *ndev, unsigned int idx, u32 *val);
 void __iomem *ntb_get_mw_vbase(struct ntb_device *ndev, unsigned int mw);
-resource_size_t ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
+u64 ntb_get_mw_size(struct ntb_device *ndev, unsigned int mw);
 void ntb_ring_sdb(struct ntb_device *ndev, unsigned int idx);
 void *ntb_find_transport(struct pci_dev *pdev);