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Commit 8a99ff5a authored by Kejian Yan's avatar Kejian Yan Committed by David S. Miller
Browse files

net: hisilicon: add support of acpi for hns-mdio 



hns-mdio needs to register itself to mii-bus. The info of the device can
be read by both DT and ACPI.
HNS tries to call Linux PHY driver to help access PHY-devices, the HNS
hardware topology is as below. The MDIO controller may control several
PHY-devices, and each PHY-device connects to a MAC device. The MDIO will
be registered to mdiobus, then PHY-devices will register when each mac
find PHY device.
                       cpu
                        |
                        |
     -------------------------------------------
    |                   |                       |
    |                   |                       |
    |                  dsaf                     |
   MDIO                 |                      MDIO
    |      ---------------------------          |
    |     |         |         |       |         |
    |     |         |         |       |         |
    |    MAC       MAC       MAC     MAC        |
    |     |         |         |       |         |
     ---- |-------- |-------- |       | --------
         ||        ||        ||       ||
         PHY       PHY       PHY     PHY

And the driver can handle reset sequence by _RST method in DSDT in ACPI
case.

Signed-off-by: default avatarKejian Yan <yankejian@huawei.com>
Signed-off-by: default avatarYisen Zhuang <Yisen.Zhuang@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 16a9f361

drivers/net/ethernet/hisilicon/hns_mdio.c

+69 −37
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 * (at your option) any later version.

 */



#include <linux/acpi.h>

#include <linux/errno.h>

#include <linux/etherdevice.h>

#include <linux/init.h>
@@ -354,9 +355,7 @@ static int hns_mdio_reset(struct mii_bus *bus) 
	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;

	int ret;



	if (!dev_of_node(bus->parent))

		return -ENOTSUPP;



	if (dev_of_node(bus->parent)) {

		if (!mdio_dev->subctrl_vbase) {

			dev_err(&bus->dev, "mdio sys ctl reg has not maped\n");

			return -ENODEV;
@@ -395,7 +394,21 @@ static int hns_mdio_reset(struct mii_bus *bus) 
					    MDIO_CHECK_SET_ST);

		if (ret)

			dev_err(&bus->dev, "MDIO en clk fail\n");



	} else if (is_acpi_node(bus->parent->fwnode)) {

		acpi_status s;



		s = acpi_evaluate_object(ACPI_HANDLE(bus->parent),

					 "_RST", NULL, NULL);

		if (ACPI_FAILURE(s)) {

			dev_err(&bus->dev, "Reset failed, return:%#x\n", s);

			ret = -EBUSY;

		} else {

			ret = 0;

		}

	} else {

		dev_err(&bus->dev, "Can not get cfg data from DT or ACPI\n");

		ret = -ENXIO;

	}

	return ret;

}
@@ -453,6 +466,18 @@ static int hns_mdio_probe(struct platform_device *pdev) 
			mdio_dev->subctrl_vbase = NULL;

		}

		ret = of_mdiobus_register(new_bus, pdev->dev.of_node);

	} else if (is_acpi_node(pdev->dev.fwnode)) {

		/* Clear all the IRQ properties */

		memset(new_bus->irq, PHY_POLL, 4 * PHY_MAX_ADDR);



		/* Mask out all PHYs from auto probing. */

		new_bus->phy_mask = ~0;



		/* Register the MDIO bus */

		ret = mdiobus_register(new_bus);

	} else {

		dev_err(&pdev->dev, "Can not get cfg data from DT or ACPI\n");

		ret = -ENXIO;

	}



	if (ret) {
@@ -487,12 +512,19 @@ static const struct of_device_id hns_mdio_match[] = { 
	{}

};



static const struct acpi_device_id hns_mdio_acpi_match[] = {

	{ "HISI0141", 0 },

	{ },

};

MODULE_DEVICE_TABLE(acpi, hns_mdio_acpi_match);



static struct platform_driver hns_mdio_driver = {

	.probe = hns_mdio_probe,

	.remove = hns_mdio_remove,

	.driver = {

		   .name = MDIO_DRV_NAME,

		   .of_match_table = hns_mdio_match,

		   .acpi_match_table = ACPI_PTR(hns_mdio_acpi_match),

		   },

};