From: Marcin Wojtas <mw@semihalf.com>
Date: Thu, 18 Jan 2018 13:31:44 +0100
Subject: net: mvpp2: enable ACPI support in the driver
Patch-mainline: v4.16-rc1
Git-commit: a75edc7c2eab329d20a4ffbbfb15f2aa4a95454f
References: bsc#1098633

This patch introduces an alternative way of obtaining resources - via
ACPI tables provided by firmware. Enabling coexistence with the DT
support, in addition to the OF_*->device_*/fwnode_* API replacement,
required following steps to be taken:

* Add mvpp2_acpi_match table
* Omit clock configuration and obtain tclk from the property - in ACPI
  world, the firmware is responsible for clock maintenance.
* Disable comphy and syscon handling as they are not available for ACPI.
* Modify way of obtaining interrupts - use newly introduced
  fwnode_irq_get() routine
* Until proper MDIO bus and PHY handling with ACPI is established in the
  kernel, use only link interrupts feature in the driver. For the RGMII
  port it results in depending on GMAC settings done during firmware
  stage.
* When booting with ACPI MVPP2_QDIST_MULTI_MODE is picked by
  default, as there is no need to keep any kind of the backward
  compatibility.

Moreover, a memory region used by mvmdio driver is usually placed in
the middle of the address space of the PP2 network controller.
The MDIO base address is obtained without requesting memory region
(by devm_ioremap() call) in mvmdio.c, later overlapping resources are
requested by the network driver, which is responsible for avoiding
a concurrent access.

In case the MDIO memory region is declared in the ACPI, it can
already appear as 'in-use' in the OS. Because it is overlapped by second
region of the network controller, make sure it is released, before
requesting it again. The care is taken by mvpp2 driver to avoid
concurrent access to this memory region.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvpp2.c |  133 ++++++++++++++++++++++++-----------
 1 file changed, 94 insertions(+), 39 deletions(-)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -10,6 +10,7 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <linux/acpi.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
@@ -7502,7 +7503,10 @@ static int mvpp2_multi_queue_vectors_ini
 			strncpy(irqname, "rx-shared", sizeof(irqname));
 		}
 
-		v->irq = of_irq_get_byname(port_node, irqname);
+		if (port_node)
+			v->irq = of_irq_get_byname(port_node, irqname);
+		else
+			v->irq = fwnode_irq_get(port->fwnode, i);
 		if (v->irq <= 0) {
 			ret = -EINVAL;
 			goto err;
@@ -7746,7 +7750,7 @@ static int mvpp2_port_probe(struct platf
 			    struct mvpp2 *priv)
 {
 	struct device_node *phy_node;
-	struct phy *comphy;
+	struct phy *comphy = NULL;
 	struct mvpp2_port *port;
 	struct mvpp2_port_pcpu *port_pcpu;
 	struct device_node *port_node = to_of_node(port_fwnode);
@@ -7760,7 +7764,12 @@ static int mvpp2_port_probe(struct platf
 	int phy_mode;
 	int err, i, cpu;
 
-	has_tx_irqs = mvpp2_port_has_tx_irqs(priv, port_node);
+	if (port_node) {
+		has_tx_irqs = mvpp2_port_has_tx_irqs(priv, port_node);
+	} else {
+		has_tx_irqs = true;
+		queue_mode = MVPP2_QDIST_MULTI_MODE;
+	}
 
 	if (!has_tx_irqs)
 		queue_mode = MVPP2_QDIST_SINGLE_MODE;
@@ -7775,7 +7784,11 @@ static int mvpp2_port_probe(struct platf
 	if (!dev)
 		return -ENOMEM;
 
-	phy_node = of_parse_phandle(port_node, "phy", 0);
+	if (port_node)
+		phy_node = of_parse_phandle(port_node, "phy", 0);
+	else
+		phy_node = NULL;
+
 	phy_mode = fwnode_get_phy_mode(port_fwnode);
 	if (phy_mode < 0) {
 		dev_err(&pdev->dev, "incorrect phy mode\n");
@@ -7783,13 +7796,15 @@ static int mvpp2_port_probe(struct platf
 		goto err_free_netdev;
 	}
 
-	comphy = devm_of_phy_get(&pdev->dev, port_node, NULL);
-	if (IS_ERR(comphy)) {
-		if (PTR_ERR(comphy) == -EPROBE_DEFER) {
-			err = -EPROBE_DEFER;
-			goto err_free_netdev;
+	if (port_node) {
+		comphy = devm_of_phy_get(&pdev->dev, port_node, NULL);
+		if (IS_ERR(comphy)) {
+			if (PTR_ERR(comphy) == -EPROBE_DEFER) {
+				err = -EPROBE_DEFER;
+				goto err_free_netdev;
+			}
+			comphy = NULL;
 		}
-		comphy = NULL;
 	}
 
 	if (fwnode_property_read_u32(port_fwnode, "port-id", &id)) {
@@ -7805,6 +7820,7 @@ static int mvpp2_port_probe(struct platf
 
 	port = netdev_priv(dev);
 	port->dev = dev;
+	port->fwnode = port_fwnode;
 	port->ntxqs = ntxqs;
 	port->nrxqs = nrxqs;
 	port->priv = priv;
@@ -7814,7 +7830,10 @@ static int mvpp2_port_probe(struct platf
 	if (err)
 		goto err_free_netdev;
 
-	port->link_irq = of_irq_get_byname(port_node, "link");
+	if (port_node)
+		port->link_irq = of_irq_get_byname(port_node, "link");
+	else
+		port->link_irq = fwnode_irq_get(port_fwnode, port->nqvecs + 1);
 	if (port->link_irq == -EPROBE_DEFER) {
 		err = -EPROBE_DEFER;
 		goto err_deinit_qvecs;
@@ -8197,6 +8216,7 @@ static int mvpp2_init(struct platform_de
 
 static int mvpp2_probe(struct platform_device *pdev)
 {
+	const struct acpi_device_id *acpi_id;
 	struct fwnode_handle *fwnode = pdev->dev.fwnode;
 	struct fwnode_handle *port_fwnode;
 	struct mvpp2 *priv;
@@ -8209,8 +8229,14 @@ static int mvpp2_probe(struct platform_d
 	if (!priv)
 		return -ENOMEM;
 
-	priv->hw_version =
-		(unsigned long)of_device_get_match_data(&pdev->dev);
+	if (has_acpi_companion(&pdev->dev)) {
+		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
+					    &pdev->dev);
+		priv->hw_version = (unsigned long)acpi_id->driver_data;
+	} else {
+		priv->hw_version =
+			(unsigned long)of_device_get_match_data(&pdev->dev);
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, res);
@@ -8224,10 +8250,23 @@ static int mvpp2_probe(struct platform_d
 			return PTR_ERR(priv->lms_base);
 	} else {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		if (has_acpi_companion(&pdev->dev)) {
+			/* In case the MDIO memory region is declared in
+			 * the ACPI, it can already appear as 'in-use'
+			 * in the OS. Because it is overlapped by second
+			 * region of the network controller, make
+			 * sure it is released, before requesting it again.
+			 * The care is taken by mvpp2 driver to avoid
+			 * concurrent access to this memory region.
+			 */
+			release_resource(res);
+		}
 		priv->iface_base = devm_ioremap_resource(&pdev->dev, res);
 		if (IS_ERR(priv->iface_base))
 			return PTR_ERR(priv->iface_base);
+	}
 
+	if (priv->hw_version == MVPP22 && dev_of_node(&pdev->dev)) {
 		priv->sysctrl_base =
 			syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 							"marvell,system-controller");
@@ -8253,32 +8292,34 @@ static int mvpp2_probe(struct platform_d
 	else
 		priv->max_port_rxqs = 32;
 
-	priv->pp_clk = devm_clk_get(&pdev->dev, "pp_clk");
-	if (IS_ERR(priv->pp_clk))
-		return PTR_ERR(priv->pp_clk);
-	err = clk_prepare_enable(priv->pp_clk);
-	if (err < 0)
-		return err;
-
-	priv->gop_clk = devm_clk_get(&pdev->dev, "gop_clk");
-	if (IS_ERR(priv->gop_clk)) {
-		err = PTR_ERR(priv->gop_clk);
-		goto err_pp_clk;
-	}
-	err = clk_prepare_enable(priv->gop_clk);
-	if (err < 0)
-		goto err_pp_clk;
+	if (dev_of_node(&pdev->dev)) {
+		priv->pp_clk = devm_clk_get(&pdev->dev, "pp_clk");
+		if (IS_ERR(priv->pp_clk))
+			return PTR_ERR(priv->pp_clk);
+		err = clk_prepare_enable(priv->pp_clk);
+		if (err < 0)
+			return err;
 
-	if (priv->hw_version == MVPP22) {
-		priv->mg_clk = devm_clk_get(&pdev->dev, "mg_clk");
-		if (IS_ERR(priv->mg_clk)) {
-			err = PTR_ERR(priv->mg_clk);
-			goto err_gop_clk;
+		priv->gop_clk = devm_clk_get(&pdev->dev, "gop_clk");
+		if (IS_ERR(priv->gop_clk)) {
+			err = PTR_ERR(priv->gop_clk);
+			goto err_pp_clk;
 		}
-
-		err = clk_prepare_enable(priv->mg_clk);
+		err = clk_prepare_enable(priv->gop_clk);
 		if (err < 0)
-			goto err_gop_clk;
+			goto err_pp_clk;
+
+		if (priv->hw_version == MVPP22) {
+			priv->mg_clk = devm_clk_get(&pdev->dev, "mg_clk");
+			if (IS_ERR(priv->mg_clk)) {
+				err = PTR_ERR(priv->mg_clk);
+				goto err_gop_clk;
+			}
+
+			err = clk_prepare_enable(priv->mg_clk);
+			if (err < 0)
+				goto err_gop_clk;
+		}
 
 		priv->axi_clk = devm_clk_get(&pdev->dev, "axi_clk");
 		if (IS_ERR(priv->axi_clk)) {
@@ -8291,10 +8332,14 @@ static int mvpp2_probe(struct platform_d
 			if (err < 0)
 				goto err_gop_clk;
 		}
-	}
 
-	/* Get system's tclk rate */
-	priv->tclk = clk_get_rate(priv->pp_clk);
+		/* Get system's tclk rate */
+		priv->tclk = clk_get_rate(priv->pp_clk);
+	} else if (device_property_read_u32(&pdev->dev, "clock-frequency",
+					    &priv->tclk)) {
+		dev_err(&pdev->dev, "missing clock-frequency value\n");
+		return -EINVAL;
+	}
 
 	if (priv->hw_version == MVPP22) {
 		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
@@ -8399,6 +8444,9 @@ static int mvpp2_remove(struct platform_
 				  aggr_txq->descs_dma);
 	}
 
+	if (is_acpi_node(port_fwnode))
+		return 0;
+
 	clk_disable_unprepare(priv->axi_clk);
 	clk_disable_unprepare(priv->mg_clk);
 	clk_disable_unprepare(priv->pp_clk);
@@ -8420,12 +8468,19 @@ static const struct of_device_id mvpp2_m
 };
 MODULE_DEVICE_TABLE(of, mvpp2_match);
 
+static const struct acpi_device_id mvpp2_acpi_match[] = {
+	{ "MRVL0110", MVPP22 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, mvpp2_acpi_match);
+
 static struct platform_driver mvpp2_driver = {
 	.probe = mvpp2_probe,
 	.remove = mvpp2_remove,
 	.driver = {
 		.name = MVPP2_DRIVER_NAME,
 		.of_match_table = mvpp2_match,
+		.acpi_match_table = ACPI_PTR(mvpp2_acpi_match),
 	},
 };