[patch v2 net-next 04/13] net: hisilicon: add support of acpi for hns-mdio
From: Kejian Yan <hidden>
Date: 2016-05-30 02:01:33
Also in:
linux-acpi, lkml
Subsystem:
hisilicon network subsystem driver, networking drivers, the rest · Maintainers:
Jian Shen, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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: Kejian Yan <redacted>
Signed-off-by: Yisen Zhuang <redacted>
---
change log:
v2:
1. use dev_of_node instead of IS_ENABLED macro
2. Add ACPI bits
v1: first submit
Link: https://lkml.org/lkml/2016/5/13/93
---
drivers/net/ethernet/hisilicon/hns_mdio.c | 107 +++++++++++++++++++-----------
1 file changed, 69 insertions(+), 38 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns_mdio.c b/drivers/net/ethernet/hisilicon/hns_mdio.c
index 381cf0a..f78286c 100644
--- a/drivers/net/ethernet/hisilicon/hns_mdio.c
+++ b/drivers/net/ethernet/hisilicon/hns_mdio.c@@ -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>
@@ -354,48 +355,60 @@ 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; + } - if (!mdio_dev->subctrl_vbase) { - dev_err(&bus->dev, "mdio sys ctl reg has not maped\n"); - return -ENODEV; - } + /* 1. reset req, and read reset st check */ + ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_REQ, 0x1, + MDIO_SC_RESET_ST, 0x1, + MDIO_CHECK_SET_ST); + if (ret) { + dev_err(&bus->dev, "MDIO reset fail\n"); + return ret; + } - /*1. reset req, and read reset st check*/ - ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_REQ, 0x1, - MDIO_SC_RESET_ST, 0x1, - MDIO_CHECK_SET_ST); - if (ret) { - dev_err(&bus->dev, "MDIO reset fail\n"); - return ret; - } + /* 2. dis clk, and read clk st check */ + ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_DIS, + 0x1, MDIO_SC_CLK_ST, 0x1, + MDIO_CHECK_CLR_ST); + if (ret) { + dev_err(&bus->dev, "MDIO dis clk fail\n"); + return ret; + } - /*2. dis clk, and read clk st check*/ - ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_DIS, - 0x1, MDIO_SC_CLK_ST, 0x1, - MDIO_CHECK_CLR_ST); - if (ret) { - dev_err(&bus->dev, "MDIO dis clk fail\n"); - return ret; - } + /* 3. reset dreq, and read reset st check */ + ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_DREQ, 0x1, + MDIO_SC_RESET_ST, 0x1, + MDIO_CHECK_CLR_ST); + if (ret) { + dev_err(&bus->dev, "MDIO dis clk fail\n"); + return ret; + } - /*3. reset dreq, and read reset st check*/ - ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_DREQ, 0x1, - MDIO_SC_RESET_ST, 0x1, - MDIO_CHECK_CLR_ST); - if (ret) { - dev_err(&bus->dev, "MDIO dis clk fail\n"); - return ret; + /* 4. en clk, and read clk st check */ + ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_EN, + 0x1, MDIO_SC_CLK_ST, 0x1, + 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; } - - /*4. en clk, and read clk st check*/ - ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_EN, - 0x1, MDIO_SC_CLK_ST, 0x1, - MDIO_CHECK_SET_ST); - if (ret) - dev_err(&bus->dev, "MDIO en clk fail\n"); - return ret; }
@@ -453,7 +466,6 @@ static int hns_mdio_probe(struct platform_device *pdev) } platform_set_drvdata(pdev, new_bus); - hns_mdio_bus_name(new_bus->id, res->start); if (dev_of_node(&pdev->dev)) { mdio_dev->subctrl_vbase = syscon_node_to_regmap(
@@ -464,6 +476,18 @@ 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) {
@@ -499,12 +523,19 @@ 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), }, };
--
1.9.1