hw/net/pcnet-pci: Convert away from old_mmio accessors

Convert the pcnet-pci device away from using the old_mmio
MemoryRegionOps accessor functions.

This commit is a no-behaviour-change API conversion.
(Since PCNET_PNPMMIO_SIZE is 0x20, the old "addr & 0x10"
check and the new "addr < 0x10" check are exact opposites;
the new code is phrased to be parallel with the
pcnet_io_read/write functions.)

I have left a TODO comment marker because the similarity
between the MMIO and IO accessor behaviour is suspicious
and they could be combined, but this will be left to a
different patch.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 55 insertions, 78 deletions

diff --git a/hw/net/pcnet-pci.c b/hw/net/pcnet-pci.c
index 70dc8b3f0c..248fb3ba29 100644
--- a/hw/net/pcnet-pci.c
+++ b/hw/net/pcnet-pci.c
@@ -139,92 +139,67 @@ static const MemoryRegionOps pcnet_io_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
-static void pcnet_mmio_writeb(void *opaque, hwaddr addr, uint32_t val)
-{
-    PCNetState *d = opaque;
-
-    trace_pcnet_mmio_writeb(opaque, addr, val);
-    if (!(addr & 0x10))
-        pcnet_aprom_writeb(d, addr & 0x0f, val);
-}
-
-static uint32_t pcnet_mmio_readb(void *opaque, hwaddr addr)
-{
-    PCNetState *d = opaque;
-    uint32_t val = -1;
-
-    if (!(addr & 0x10))
-        val = pcnet_aprom_readb(d, addr & 0x0f);
-    trace_pcnet_mmio_readb(opaque, addr, val);
-    return val;
-}
-
-static void pcnet_mmio_writew(void *opaque, hwaddr addr, uint32_t val)
+/*
+ * TODO: should MMIO accesses to the addresses corresponding to the
+ * APROM also honour the BCR_DWIO() setting? If so, then these functions
+ * and pcnet_ioport_write/pcnet_ioport_read could be merged.
+ * If not, then should pcnet_ioport_{read,write}{w,l} really check
+ * BCR_DWIO() for MMIO writes ?
+ */
+static void pcnet_mmio_write(void *opaque, hwaddr addr, uint64_t value,
+                             unsigned size)
 {
     PCNetState *d = opaque;
 
-    trace_pcnet_mmio_writew(opaque, addr, val);
-    if (addr & 0x10)
-        pcnet_ioport_writew(d, addr & 0x0f, val);
-    else {
-        addr &= 0x0f;
-        pcnet_aprom_writeb(d, addr, val & 0xff);
-        pcnet_aprom_writeb(d, addr+1, (val & 0xff00) >> 8);
-    }
-}
+    trace_pcnet_mmio_write(opaque, addr, size, val);
 
-static uint32_t pcnet_mmio_readw(void *opaque, hwaddr addr)
-{
-    PCNetState *d = opaque;
-    uint32_t val = -1;
-
-    if (addr & 0x10)
-        val = pcnet_ioport_readw(d, addr & 0x0f);
-    else {
-        addr &= 0x0f;
-        val = pcnet_aprom_readb(d, addr+1);
-        val <<= 8;
-        val |= pcnet_aprom_readb(d, addr);
+    if (addr < 0x10) {
+        if (size == 1) {
+            pcnet_aprom_writeb(d, addr, data);
+        } else if ((addr & 1) == 0 && size == 2) {
+            pcnet_aprom_writeb(d, addr, data & 0xff);
+            pcnet_aprom_writeb(d, addr + 1, data >> 8);
+        } else if ((addr & 3) == 0 && size == 4) {
+            pcnet_aprom_writeb(d, addr, data & 0xff);
+            pcnet_aprom_writeb(d, addr + 1, (data >> 8) & 0xff);
+            pcnet_aprom_writeb(d, addr + 2, (data >> 16) & 0xff);
+            pcnet_aprom_writeb(d, addr + 3, data >> 24);
+        }
+    } else {
+        if (size == 2) {
+            pcnet_ioport_writew(d, addr, data);
+        } else if (size == 4) {
+            pcnet_ioport_writel(d, addr, data);
+        }
     }
-    trace_pcnet_mmio_readw(opaque, addr, val);
-    return val;
 }
 
-static void pcnet_mmio_writel(void *opaque, hwaddr addr, uint32_t val)
+static uint64_t pcnet_mmio_read(void *opque, hwaddr addr, unsigned size)
 {
     PCNetState *d = opaque;
 
-    trace_pcnet_mmio_writel(opaque, addr, val);
-    if (addr & 0x10)
-        pcnet_ioport_writel(d, addr & 0x0f, val);
-    else {
-        addr &= 0x0f;
-        pcnet_aprom_writeb(d, addr, val & 0xff);
-        pcnet_aprom_writeb(d, addr+1, (val & 0xff00) >> 8);
-        pcnet_aprom_writeb(d, addr+2, (val & 0xff0000) >> 16);
-        pcnet_aprom_writeb(d, addr+3, (val & 0xff000000) >> 24);
-    }
-}
+    trace_pcnet_ioport_read(opaque, addr, size);
 
-static uint32_t pcnet_mmio_readl(void *opaque, hwaddr addr)
-{
-    PCNetState *d = opaque;
-    uint32_t val;
-
-    if (addr & 0x10)
-        val = pcnet_ioport_readl(d, addr & 0x0f);
-    else {
-        addr &= 0x0f;
-        val = pcnet_aprom_readb(d, addr+3);
-        val <<= 8;
-        val |= pcnet_aprom_readb(d, addr+2);
-        val <<= 8;
-        val |= pcnet_aprom_readb(d, addr+1);
-        val <<= 8;
-        val |= pcnet_aprom_readb(d, addr);
+    if (addr < 0x10) {
+        if (size == 1) {
+            return pcnet_aprom_readb(d, addr);
+        } else if ((addr & 1) == 0 && size == 2) {
+            return pcnet_aprom_readb(d, addr) |
+                   (pcnet_aprom_readb(d, addr + 1) << 8);
+        } else if ((addr & 3) == 0 && size == 4) {
+            return pcnet_aprom_readb(d, addr) |
+                   (pcnet_aprom_readb(d, addr + 1) << 8) |
+                   (pcnet_aprom_readb(d, addr + 2) << 16) |
+                   (pcnet_aprom_readb(d, addr + 3) << 24);
+        }
+    } else {
+        if (size == 2) {
+            return pcnet_ioport_readw(d, addr);
+        } else if (size == 4) {
+            return pcnet_ioport_readl(d, addr);
+        }
     }
-    trace_pcnet_mmio_readl(opaque, addr, val);
-    return val;
+    return ((uint64_t)1 << (size * 8)) - 1;
 }
 
 static const VMStateDescription vmstate_pci_pcnet = {
@@ -241,10 +216,12 @@ static const VMStateDescription vmstate_pci_pcnet = {
 /* PCI interface */
 
 static const MemoryRegionOps pcnet_mmio_ops = {
-    .old_mmio = {
-        .read = { pcnet_mmio_readb, pcnet_mmio_readw, pcnet_mmio_readl },
-        .write = { pcnet_mmio_writeb, pcnet_mmio_writew, pcnet_mmio_writel },
-    },
+    .read = pcnet_mmio_read,
+    .write = pcnet_mmio_write,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 4,
+    .impl.min_access_size = 1,
+    .impl.max_access_size = 4,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };