hw/net/lan9118_phy: Reuse in imx_fec and consolidate implementations

imx_fec models the same PHY as lan9118_phy. The code is almost the same with
imx_fec having more logging and tracing. Merge these improvements into
lan9118_phy and reuse in imx_fec to fix the code duplication.

Some migration state how resides in the new device model which breaks migration
compatibility for the following machines:
* imx25-pdk
* sabrelite
* mcimx7d-sabre
* mcimx6ul-evk

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20241102125724.532843-3-shentey@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 15 insertions, 131 deletions

diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index 6294d29202..4ee6f74206 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -203,17 +203,12 @@ static const VMStateDescription vmstate_imx_eth_txdescs = {
 
 static const VMStateDescription vmstate_imx_eth = {
     .name = TYPE_IMX_FEC,
-    .version_id = 2,
-    .minimum_version_id = 2,
+    .version_id = 3,
+    .minimum_version_id = 3,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32_ARRAY(regs, IMXFECState, ENET_MAX),
         VMSTATE_UINT32(rx_descriptor, IMXFECState),
         VMSTATE_UINT32(tx_descriptor[0], IMXFECState),
-        VMSTATE_UINT32(phy_status, IMXFECState),
-        VMSTATE_UINT32(phy_control, IMXFECState),
-        VMSTATE_UINT32(phy_advertise, IMXFECState),
-        VMSTATE_UINT32(phy_int, IMXFECState),
-        VMSTATE_UINT32(phy_int_mask, IMXFECState),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription * const []) {
@@ -222,14 +217,6 @@ static const VMStateDescription vmstate_imx_eth = {
     },
 };
 
-#define PHY_INT_ENERGYON            (1 << 7)
-#define PHY_INT_AUTONEG_COMPLETE    (1 << 6)
-#define PHY_INT_FAULT               (1 << 5)
-#define PHY_INT_DOWN                (1 << 4)
-#define PHY_INT_AUTONEG_LP          (1 << 3)
-#define PHY_INT_PARFAULT            (1 << 2)
-#define PHY_INT_AUTONEG_PAGE        (1 << 1)
-
 static void imx_eth_update(IMXFECState *s);
 
 /*
@@ -238,47 +225,19 @@ static void imx_eth_update(IMXFECState *s);
  * For now we don't handle any GPIO/interrupt line, so the OS will
  * have to poll for the PHY status.
  */
-static void imx_phy_update_irq(IMXFECState *s)
-{
-    imx_eth_update(s);
-}
-
-static void imx_phy_update_link(IMXFECState *s)
+static void imx_phy_update_irq(void *opaque, int n, int level)
 {
-    /* Autonegotiation status mirrors link status.  */
-    if (qemu_get_queue(s->nic)->link_down) {
-        trace_imx_phy_update_link("down");
-        s->phy_status &= ~0x0024;
-        s->phy_int |= PHY_INT_DOWN;
-    } else {
-        trace_imx_phy_update_link("up");
-        s->phy_status |= 0x0024;
-        s->phy_int |= PHY_INT_ENERGYON;
-        s->phy_int |= PHY_INT_AUTONEG_COMPLETE;
-    }
-    imx_phy_update_irq(s);
+    imx_eth_update(opaque);
 }
 
 static void imx_eth_set_link(NetClientState *nc)
 {
-    imx_phy_update_link(IMX_FEC(qemu_get_nic_opaque(nc)));
-}
-
-static void imx_phy_reset(IMXFECState *s)
-{
-    trace_imx_phy_reset();
-
-    s->phy_status = 0x7809;
-    s->phy_control = 0x3000;
-    s->phy_advertise = 0x01e1;
-    s->phy_int_mask = 0;
-    s->phy_int = 0;
-    imx_phy_update_link(s);
+    lan9118_phy_update_link(&IMX_FEC(qemu_get_nic_opaque(nc))->mii,
+                            nc->link_down);
 }
 
 static uint32_t imx_phy_read(IMXFECState *s, int reg)
 {
-    uint32_t val;
     uint32_t phy = reg / 32;
 
     if (!s->phy_connected) {
@@ -296,54 +255,7 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
 
     reg %= 32;
 
-    switch (reg) {
-    case 0:     /* Basic Control */
-        val = s->phy_control;
-        break;
-    case 1:     /* Basic Status */
-        val = s->phy_status;
-        break;
-    case 2:     /* ID1 */
-        val = 0x0007;
-        break;
-    case 3:     /* ID2 */
-        val = 0xc0d1;
-        break;
-    case 4:     /* Auto-neg advertisement */
-        val = s->phy_advertise;
-        break;
-    case 5:     /* Auto-neg Link Partner Ability */
-        val = 0x0f71;
-        break;
-    case 6:     /* Auto-neg Expansion */
-        val = 1;
-        break;
-    case 29:    /* Interrupt source.  */
-        val = s->phy_int;
-        s->phy_int = 0;
-        imx_phy_update_irq(s);
-        break;
-    case 30:    /* Interrupt mask */
-        val = s->phy_int_mask;
-        break;
-    case 17:
-    case 18:
-    case 27:
-    case 31:
-        qemu_log_mask(LOG_UNIMP, "[%s.phy]%s: reg %d not implemented\n",
-                      TYPE_IMX_FEC, __func__, reg);
-        val = 0;
-        break;
-    default:
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad address at offset %d\n",
-                      TYPE_IMX_FEC, __func__, reg);
-        val = 0;
-        break;
-    }
-
-    trace_imx_phy_read(val, phy, reg);
-
-    return val;
+    return lan9118_phy_read(&s->mii, reg);
 }
 
 static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
@@ -365,39 +277,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
 
     reg %= 32;
 
-    trace_imx_phy_write(val, phy, reg);
-
-    switch (reg) {
-    case 0:     /* Basic Control */
-        if (val & 0x8000) {
-            imx_phy_reset(s);
-        } else {
-            s->phy_control = val & 0x7980;
-            /* Complete autonegotiation immediately.  */
-            if (val & 0x1000) {
-                s->phy_status |= 0x0020;
-            }
-        }
-        break;
-    case 4:     /* Auto-neg advertisement */
-        s->phy_advertise = (val & 0x2d7f) | 0x80;
-        break;
-    case 30:    /* Interrupt mask */
-        s->phy_int_mask = val & 0xff;
-        imx_phy_update_irq(s);
-        break;
-    case 17:
-    case 18:
-    case 27:
-    case 31:
-        qemu_log_mask(LOG_UNIMP, "[%s.phy)%s: reg %d not implemented\n",
-                      TYPE_IMX_FEC, __func__, reg);
-        break;
-    default:
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad address at offset %d\n",
-                      TYPE_IMX_FEC, __func__, reg);
-        break;
-    }
+    lan9118_phy_write(&s->mii, reg, val);
 }
 
 static void imx_fec_read_bd(IMXFECBufDesc *bd, dma_addr_t addr)
@@ -682,9 +562,6 @@ static void imx_eth_reset(DeviceState *d)
 
     s->rx_descriptor = 0;
     memset(s->tx_descriptor, 0, sizeof(s->tx_descriptor));
-
-    /* We also reset the PHY */
-    imx_phy_reset(s);
 }
 
 static uint32_t imx_default_read(IMXFECState *s, uint32_t index)
@@ -1329,6 +1206,13 @@ static void imx_eth_realize(DeviceState *dev, Error **errp)
     sysbus_init_irq(sbd, &s->irq[0]);
     sysbus_init_irq(sbd, &s->irq[1]);
 
+    qemu_init_irq(&s->mii_irq, imx_phy_update_irq, s, 0);
+    object_initialize_child(OBJECT(s), "mii", &s->mii, TYPE_LAN9118_PHY);
+    if (!sysbus_realize_and_unref(SYS_BUS_DEVICE(&s->mii), errp)) {
+        return;
+    }
+    qdev_connect_gpio_out(DEVICE(&s->mii), 0, &s->mii_irq);
+
     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 
     s->nic = qemu_new_nic(&imx_eth_net_info, &s->conf,