pci: sandbox: swap_case: Preserve space indicator bit in BAR registers

With the newly added testing of more than one device, we get:

  => ut dm pci_swapcase
  Test: dm_test_pci_swapcase: pci.c
  test/dm/pci.c:88, dm_test_pci_swapcase(): "tHIS IS A tESt" = ptr:
  Expected "tHIS IS A tESt", got "this is a test"
  Test: dm_test_pci_swapcase: pci.c (flat tree)
  test/dm/pci.c:88, dm_test_pci_swapcase(): "tHIS IS A tESt" = ptr:
  Expected "tHIS IS A tESt", got "this is a test"
  Failures: 2

The failure only happens on the 2nd swap_case device on the PCI bus.
The case passes on the 1st device.

It turns out the swap_case driver does not emulate bit#0 in BAR
registers as a read-only bit. This corrects the implementation.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/misc/swap_case.c

@@ -142,6 +142,8 @@ static int sandbox_swap_case_write_config(struct udevice *emul, uint offset,
 
 		debug("w bar %d=%lx\n", barnum, value);
 		*bar = value;
+		/* space indicator (bit#0) is read-only */
+		*bar |= barinfo[barnum].type;
 		break;
 	}
 	}
@@ -157,11 +159,11 @@ static int sandbox_swap_case_find_bar(struct udevice *emul, unsigned int addr,
 
 	for (barnum = 0; barnum < ARRAY_SIZE(barinfo); barnum++) {
 		unsigned int size = barinfo[barnum].size;
+		u32 base = plat->bar[barnum] & ~PCI_BASE_ADDRESS_SPACE;
 
-		if (addr >= plat->bar[barnum] &&
-		    addr < plat->bar[barnum] + size) {
+		if (addr >= base && addr < base + size) {
 			*barnump = barnum;
-			*offsetp = addr - plat->bar[barnum];
+			*offsetp = addr - base;
 			return 0;
 		}
 	}