Fix endianness issues with adm5120eb, thanks to Gabor !

[openwrt/staging/chunkeey.git] / target / linux / adm5120-2.6 / files / arch / mips / pci / ops-adm5120.c

diff --git a/target/linux/adm5120-2.6/files/arch/mips/pci/ops-adm5120.c b/target/linux/adm5120-2.6/files/arch/mips/pci/ops-adm5120.c
index ff768033ecac80c0c213d111dc7d8e6181d70fe9..f7e4e6686fa17d8f10a95f12f3b4ac7a2fc1b12a 100644 (file)
--- a/target/linux/adm5120-2.6/files/arch/mips/pci/ops-adm5120.c
+++ b/target/linux/adm5120-2.6/files/arch/mips/pci/ops-adm5120.c
@@ -26,54 +26,105 @@
  */
 
 #include <linux/types.h>
-#include <linux/pci.h>
 #include <linux/kernel.h>
-#include <linux/init.h>
+#include <linux/pci.h>
 
 #include <asm/mach-adm5120/adm5120_defs.h>
 
-volatile u32* pci_config_address_reg = (volatile u32*)KSEG1ADDR(ADM5120_PCICFG_ADDR);
-volatile u32* pci_config_data_reg = (volatile u32*)KSEG1ADDR(ADM5120_PCICFG_DATA);
+#define DEBUG  0
+#if DEBUG
+#define DBG(f, ...) printk(f, ## __VA_ARGS__ )
+#else
+#define DBG(f, ...)
+#endif
 
 #define PCI_ENABLE 0x80000000
 
+static inline void write_cfgaddr(u32 addr)
+{
+       *(volatile u32*)KSEG1ADDR(ADM5120_PCICFG_ADDR) = (addr | PCI_ENABLE);
+}
+
+static inline void write_cfgdata(u32 data)
+{
+       *(volatile u32*)KSEG1ADDR(ADM5120_PCICFG_DATA) = data;
+
+}
+
+static inline u32 read_cfgdata(void)
+{
+       return (*(volatile u32*)KSEG1ADDR(ADM5120_PCICFG_DATA));
+}
+
+static inline u32 mkaddr(struct pci_bus *bus, unsigned int devfn, int where)
+{
+       return (((bus->number & 0xFF) << 16) | ((devfn & 0xFF) << 8) | \
+               (where & 0xFC));
+}
+
 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
-                           int size, uint32_t *val)
+                           int size, u32 *val)
 {
-       *pci_config_address_reg = ((bus->number & 0xff) << 0x10) |
-           ((devfn & 0xff) << 0x08) | (where & 0xfc) | PCI_ENABLE;
+       u32 data;
+
+       write_cfgaddr(mkaddr(bus,devfn,where));
+       data = read_cfgdata();  
+
+       DBG("PCI: cfg_read  %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
+               bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, data);
+
        switch (size) {
        case 1:
-               *val = ((*pci_config_data_reg)>>((where&3)<<3))&0xff;
+               if (where & 1)
+                       data >>= 8;
+               if (where & 2)
+                       data >>= 16;
+               data &= 0xFF;
                break;
        case 2:
-               *val = ((*pci_config_data_reg)>>((where&3)<<3))&0xffff;
-               break;
-       default:
-               *val = (*pci_config_data_reg);
+               if (where & 2)
+                       data >>= 16;
+               data &= 0xFFFF;
                break;
        }
+
+       *val = data;
+       DBG(", 0x%08X returned\n", data);
+       
        return PCIBIOS_SUCCESSFUL;
 }
 
 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
-                            int size, uint32_t val)
+                            int size, u32 val)
 {
-       *pci_config_address_reg = ((bus->number & 0xff) << 0x10) |
-           ((devfn & 0xff) << 0x08) | (where & 0xfc) | PCI_ENABLE;
+       u32 data;
+       int s;
+
+       write_cfgaddr(mkaddr(bus,devfn,where));
+       data = read_cfgdata();
+
+       DBG("PCI: cfg_write %02u.%02u.%01u/%02X:%01d, cfg:0x%08X",
+               bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, data);
+           
        switch (size) {
        case 1:
-               *(volatile u8 *)(((int)pci_config_data_reg) +
-                           (where & 3)) = val;
+               s = ((where & 3) << 3);
+               data &= ~(0xFF << s);
+               data |= ((val & 0xFF) << s);
                break;
        case 2:
-               *(volatile u16 *)(((int)pci_config_data_reg) +
-                           (where & 2)) = (val);
+               s = ((where & 2) << 4);
+               data &= ~(0xFFFF << s);
+               data |= ((val & 0xFFFF) << s);
+               break;
+       case 4:
+               data = val;
                break;
-       default:
-               *pci_config_data_reg = (val);
        }
 
+       write_cfgdata(data);
+       DBG(", 0x%08X written\n", data);
+
        return PCIBIOS_SUCCESSFUL;
 }