net: qcom/emac: initial ACPI support

Add support for reading addresses, interrupts, and _DSD properties
from ACPI tables, just like with device tree.  The HID for the
EMAC device itself is QCOM8070.  The internal PHY is represented
by a child node with a HID of QCOM8071.

The EMAC also has some complex clock initialization requirements
that are not represented by this patch.  This will be addressed
in a future patch.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 95 insertions, 26 deletions

diff --git a/drivers/net/ethernet/qualcomm/emac/emac-phy.c b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
index c412ba9a27e7..da4e90db4d98 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac-phy.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
@@ -19,6 +19,7 @@
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/iopoll.h>
+#include <linux/acpi.h>
 #include "emac.h"
 #include "emac-mac.h"
 #include "emac-phy.h"
@@ -167,7 +168,6 @@ static int emac_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
 int emac_phy_config(struct platform_device *pdev, struct emac_adapter *adpt)
 {
         struct device_node *np = pdev->dev.of_node;
-        struct device_node *phy_np;
         struct mii_bus *mii_bus;
         int ret;
 
@@ -183,14 +183,37 @@ int emac_phy_config(struct platform_device *pdev, struct emac_adapter *adpt)
         mii_bus->parent = &pdev->dev;
         mii_bus->priv = adpt;
 
-        ret = of_mdiobus_register(mii_bus, np);
-        if (ret) {
-                dev_err(&pdev->dev, "could not register mdio bus\n");
-                return ret;
+        if (has_acpi_companion(&pdev->dev)) {
+                u32 phy_addr;
+
+                ret = mdiobus_register(mii_bus);
+                if (ret) {
+                        dev_err(&pdev->dev, "could not register mdio bus\n");
+                        return ret;
+                }
+                ret = device_property_read_u32(&pdev->dev, "phy-channel",
+                                               &phy_addr);
+                if (ret)
+                        /* If we can't read a valid phy address, then assume
+                         * that there is only one phy on this mdio bus.
+                         */
+                        adpt->phydev = phy_find_first(mii_bus);
+                else
+                        adpt->phydev = mdiobus_get_phy(mii_bus, phy_addr);
+
+        } else {
+                struct device_node *phy_np;
+
+                ret = of_mdiobus_register(mii_bus, np);
+                if (ret) {
+                        dev_err(&pdev->dev, "could not register mdio bus\n");
+                        return ret;
+                }
+
+                phy_np = of_parse_phandle(np, "phy-handle", 0);
+                adpt->phydev = of_phy_find_device(phy_np);
         }
 
-        phy_np = of_parse_phandle(np, "phy-handle", 0);
-        adpt->phydev = of_phy_find_device(phy_np);
         if (!adpt->phydev) {
                 dev_err(&pdev->dev, "could not find external phy\n");
                 mdiobus_unregister(mii_bus);
diff --git a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
index ad0e4209d948..3d2c05a40d2c 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
@@ -14,6 +14,7 @@
  */
 
 #include <linux/iopoll.h>
+#include <linux/acpi.h>
 #include <linux/of_device.h>
 #include "emac.h"
 #include "emac-mac.h"
@@ -662,6 +663,24 @@ void emac_sgmii_reset(struct emac_adapter *adpt)
         clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 125000000);
 }
 
+static int emac_sgmii_acpi_match(struct device *dev, void *data)
+{
+        static const struct acpi_device_id match_table[] = {
+                {
+                        .id = "QCOM8071",
+                        .driver_data = (kernel_ulong_t)emac_sgmii_init_v2,
+                },
+                {}
+        };
+        const struct acpi_device_id *id = acpi_match_device(match_table, dev);
+        emac_sgmii_initialize *initialize = data;
+
+        if (id)
+                *initialize = (emac_sgmii_initialize)id->driver_data;
+
+        return !!id;
+}
+
 static const struct of_device_id emac_sgmii_dt_match[] = {
         {
                 .compatible = "qcom,fsm9900-emac-sgmii",
@@ -679,30 +698,45 @@ int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
         struct platform_device *sgmii_pdev = NULL;
         struct emac_phy *phy = &adpt->phy;
         struct resource *res;
-        const struct of_device_id *match;
-        struct device_node *np;
         int ret;
 
-        np = of_parse_phandle(pdev->dev.of_node, "internal-phy", 0);
-        if (!np) {
-                dev_err(&pdev->dev, "missing internal-phy property\n");
-                return -ENODEV;
-        }
+        if (has_acpi_companion(&pdev->dev)) {
+                struct device *dev;
 
-        sgmii_pdev = of_find_device_by_node(np);
-        if (!sgmii_pdev) {
-                dev_err(&pdev->dev, "invalid internal-phy property\n");
-                return -ENODEV;
-        }
+                dev = device_find_child(&pdev->dev, &phy->initialize,
+                                        emac_sgmii_acpi_match);
 
-        match = of_match_device(emac_sgmii_dt_match, &sgmii_pdev->dev);
-        if (!match) {
-                dev_err(&pdev->dev, "unrecognized internal phy node\n");
-                ret = -ENODEV;
-                goto error_put_device;
-        }
+                if (!dev) {
+                        dev_err(&pdev->dev, "cannot find internal phy node\n");
+                        return -ENODEV;
+                }
 
-        phy->initialize = (emac_sgmii_initialize)match->data;
+                sgmii_pdev = to_platform_device(dev);
+        } else {
+                const struct of_device_id *match;
+                struct device_node *np;
+
+                np = of_parse_phandle(pdev->dev.of_node, "internal-phy", 0);
+                if (!np) {
+                        dev_err(&pdev->dev, "missing internal-phy property\n");
+                        return -ENODEV;
+                }
+
+                sgmii_pdev = of_find_device_by_node(np);
+                if (!sgmii_pdev) {
+                        dev_err(&pdev->dev, "invalid internal-phy property\n");
+                        return -ENODEV;
+                }
+
+                match = of_match_device(emac_sgmii_dt_match, &sgmii_pdev->dev);
+                if (!match) {
+                        dev_err(&pdev->dev, "unrecognized internal phy node\n");
+                        ret = -ENODEV;
+                        goto error_put_device;
+                }
+
+                phy->initialize = (emac_sgmii_initialize)match->data;
+        }
 
         /* Base address is the first address */
         res = platform_get_resource(sgmii_pdev, IORESOURCE_MEM, 0);
diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
index 551df1c52620..9bf3b2b82e95 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -22,6 +22,7 @@
 #include <linux/of_device.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
+#include <linux/acpi.h>
 #include "emac.h"
 #include "emac-mac.h"
 #include "emac-phy.h"
@@ -575,6 +576,16 @@ static const struct of_device_id emac_dt_match[] = {
         {}
 };
 
+#if IS_ENABLED(CONFIG_ACPI)
+static const struct acpi_device_id emac_acpi_match[] = {
+        {
+                .id = "QCOM8070",
+        },
+        {}
+};
+MODULE_DEVICE_TABLE(acpi, emac_acpi_match);
+#endif
+
 static int emac_probe(struct platform_device *pdev)
 {
         struct net_device *netdev;
@@ -734,6 +745,7 @@ static struct platform_driver emac_platform_driver = {
         .driver = {
                 .name           = "qcom-emac",
                 .of_match_table = emac_dt_match,
+                .acpi_match_table = ACPI_PTR(emac_acpi_match),
         },
 };