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Subject[patch net-next 01/11] net: hisilicon: add support of acpi for hns-mdio
Date
From: Kejian Yan <yankejian@huawei.com>

hns-mdio needs to register itself to mii-bus. The info of the device can
be read by both OF 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 _DSD method in DSDT in ACPI case.

Signed-off-by: Kejian Yan <yankejian@huawei.com>
Signed-off-by: Yisen Zhuang <Yisen.Zhuang@huawei.com>
---
drivers/net/ethernet/hisilicon/hns_mdio.c | 145 ++++++++++++++++++------------
1 file changed, 90 insertions(+), 55 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns_mdio.c b/drivers/net/ethernet/hisilicon/hns_mdio.c
index 765ddb3..4b779df 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>
@@ -354,64 +355,72 @@ static int hns_mdio_reset(struct mii_bus *bus)
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
int ret;

- 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;
- }
+ if (IS_ENABLED(CONFIG_OF) && bus->parent->of_node) {
+ if (!mdio_dev->subctrl_vbase) {
+ dev_err(&bus->dev, "mdio sys ctl reg has not maped\n");
+ return -ENODEV;
+ }

- /*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;
- }
+ /*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;
+ }

- /*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;
- }
+ /*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;
+ }

- /*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");
+ /*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 (ACPI_COMPANION(bus->parent)) {
+ 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, "cannot get cfd data from of or acpi\n");
+ ret = -ENXIO;
+ }
return ret;
}

/**
* hns_mdio_bus_name - get mdio bus name
* @name: mdio bus name
- * @np: mdio device node pointer
+ * @addr: mdio physical address
*/
-static void hns_mdio_bus_name(char *name, struct device_node *np)
+static void hns_mdio_bus_name(char *name, phys_addr_t addr)
{
- const u32 *addr;
- u64 taddr = OF_BAD_ADDR;
-
- addr = of_get_address(np, 0, NULL, NULL);
- if (addr)
- taddr = of_translate_address(np, addr);
-
- snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
- (unsigned long long)taddr);
+ snprintf(name, MII_BUS_ID_SIZE,
+ "hns-mdio@%llx", (unsigned long long)addr);
}

/**
@@ -422,7 +431,6 @@ static void hns_mdio_bus_name(char *name, struct device_node *np)
*/
static int hns_mdio_probe(struct platform_device *pdev)
{
- struct device_node *np;
struct hns_mdio_device *mdio_dev;
struct mii_bus *new_bus;
struct resource *res;
@@ -432,7 +440,7 @@ static int hns_mdio_probe(struct platform_device *pdev)
dev_err(NULL, "pdev is NULL!\r\n");
return -ENODEV;
}
- np = pdev->dev.of_node;
+
mdio_dev = devm_kzalloc(&pdev->dev, sizeof(*mdio_dev), GFP_KERNEL);
if (!mdio_dev)
return -ENOMEM;
@@ -448,7 +456,6 @@ static int hns_mdio_probe(struct platform_device *pdev)
new_bus->write = hns_mdio_write;
new_bus->reset = hns_mdio_reset;
new_bus->priv = mdio_dev;
- hns_mdio_bus_name(new_bus->id, np);

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mdio_dev->vbase = devm_ioremap_resource(&pdev->dev, res);
@@ -457,16 +464,37 @@ static int hns_mdio_probe(struct platform_device *pdev)
return ret;
}

- mdio_dev->subctrl_vbase =
- syscon_node_to_regmap(of_parse_phandle(np, "subctrl-vbase", 0));
- if (IS_ERR(mdio_dev->subctrl_vbase)) {
- dev_warn(&pdev->dev, "no syscon hisilicon,peri-c-subctrl\n");
- mdio_dev->subctrl_vbase = NULL;
+ hns_mdio_bus_name(new_bus->id, res->start);
+ if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+ mdio_dev->subctrl_vbase = syscon_node_to_regmap(
+ of_parse_phandle(pdev->dev.of_node,
+ "subctrl-vbase", 0));
+ if (IS_ERR(mdio_dev->subctrl_vbase)) {
+ dev_warn(&pdev->dev, "no syscon hisilicon,peri-c-subctrl\n");
+ mdio_dev->subctrl_vbase = NULL;
+ }
}
new_bus->parent = &pdev->dev;
platform_set_drvdata(pdev, new_bus);

- ret = of_mdiobus_register(new_bus, np);
+ if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+ ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
+ } else if (ACPI_COMPANION(&pdev->dev)) {
+ /* 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);
+ if (ret)
+ return ret;
+ } else {
+ dev_err(&pdev->dev, "cannot get cfd data from of or acpi\n");
+ return -ENXIO;
+ }
+
if (ret) {
dev_err(&pdev->dev, "Cannot register as MDIO bus!\n");
platform_set_drvdata(pdev, NULL);
@@ -499,12 +527,19 @@ 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
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