Loongson2k pci: fix ls2k pci io base and limit config.

ls2k io space size is 32M.
io base, io limit, io upper base, io upper limit's value in pci config space need in 32M.

Change-Id: I8ceffbaa684eadc32df96f4d960176281e851f1d
Signed-off-by: QiaoChong <qiaochong@loongson.cn>

Targets/LS2K/ls2k/tgt_machdep.c

@@ -1851,10 +1851,15 @@ void ls_pci_msi_window_config(void)
 	__raw__writeq(0x900000001fe12580 , 0x000000001fe10081ULL);
 }
 
+
+#define LS2K_PCI_IO_MASK 0x1ffffff
+
 void ls_pcie_mem_fixup(struct pci_config_data *pdata)
 {
 	unsigned int dev;
 	unsigned int val;
+	unsigned int io_start;
+	unsigned int io_end;
 
 	dev = _pci_make_tag(pdata->bus, pdata->dev, pdata->func);
 	val = _pci_conf_read32(dev, 0x00);
@@ -1870,11 +1875,13 @@ void ls_pcie_mem_fixup(struct pci_config_data *pdata)
 					_pci_conf_write32(dev, 0x20, val);
 					_pci_conf_write32(dev, 0x24, val);
 
+					io_start = pdata->io_start & LS2K_PCI_IO_MASK;
+					io_end = pdata->io_end & LS2K_PCI_IO_MASK;
 					/*write io upper 16bit base and io upper 16bit limit*/
-					val = ((pdata->io_start >> 16)&0xff)|(pdata->io_end&0xff0000);
+					val = ((io_start >> 16)&0xffff)|(io_end&0xffff0000);
 					_pci_conf_write32(dev, 0x30, val);
 					/*write io base and io limit*/
-					val = ((pdata->io_start >> 8)&0xf0)|(pdata->io_end & 0xf0);
+					val = ((io_start >> 8)&0xf0)|(io_end & 0xf000);
 					val|= 0x1 | (0x1 << 8);
 					_pci_conf_write16(dev, 0x1c, val);
 			}