Add has_io_space flag.

PCIDevice
- supports_io_space method now uses a flag has_io_space which is automatically set for PCI bridges or PCI devices that have an I/O BAR.

atirage
- Devices that have I/O BARs don't need a supports_io_space method.

mpc106
- Devices that don't have I/O methods don't need a supports_io_space method.

devices/common/pci/pcidevice.cpp

@@ -240,6 +240,7 @@ void PCIDevice::finish_config_bars()
         if (bar_cfg & 1) {
             bars_typ[bar_num] = (bar_cfg & 0xffff0000) ? PCIBarType::Io_32_Bit :
                                                          PCIBarType::Io_16_Bit;
+            has_io_space = true;
         }
         else {
             int pci_space_type = (bar_cfg >> 1) & 3;

devices/common/pci/pcidevice.h

@@ -81,7 +81,7 @@ public:
     virtual ~PCIDevice() = default;
 
     virtual bool supports_io_space() {
-        return false;
+        return has_io_space;
     };
 
     /* I/O space access methods */
@@ -156,6 +156,7 @@ protected:
     uint8_t     irq_pin = 0;
     uint8_t     irq_line = 0;
 
+    bool        has_io_space = false;
     int         num_bars = 6;
     uint32_t    bars[6] = { 0 };     // base address registers
     uint32_t    bars_cfg[6] = { 0 }; // configuration values for base address registers

devices/memctrl/mpc106.h

@@ -92,10 +92,6 @@ protected:
     uint32_t pci_cfg_read(uint32_t reg_offs, AccessDetails &details);
     void pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &details);
 
-    bool supports_io_space(void) {
-        return true;
-    };
-
     void setup_ram(void);
 
 private:

devices/video/atirage.h

@@ -60,10 +60,6 @@ public:
     void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size);
 
     /* PCI device methods */
-    bool supports_io_space(void) {
-        return true;
-    };
-
     uint32_t pci_cfg_read(uint32_t reg_offs, AccessDetails &details);
     void pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &details);