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kernel: rtl8366-smi: add Realtek switch management via mii-bus

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Current version of rtl8366-smi module only supports Realtek switch
managment via two gpio lines. This adds Realtek switch
management via mii_bus. Tested on a Tp-link Archer C2 v1 (Mediatek
SoC mt7620a based)

dts-file configuration should look like this:

rtl8367rb {
	compatible = "realtek,rtl8367b";
	realtek,extif1 = <1 0 1 1 1 1 1 1 2>;
	mii-bus = <&mdio0>;
};

&ethernet {
	status = "okay";
	mtd-mac-address = <&rom 0xf100>;
	pinctrl-names = "default";
	pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>;

	port@5 {
		status = "okay";
		mediatek,fixed-link = <1000 1 1 1>;
		phy-mode = "rgmii";
	};

	mdio0: mdio-bus {
		status = "okay";
	};
};

Signed-off-by: Serge Vasilugin <vasilugin@yandex.ru>
Signed-off-by: Franz Flasch <franz.flasch@gmx.at>
This commit is contained in:
Franz Flasch 2018-05-17 11:51:38 +02:00 committed by Mathias Kresin
parent f9e7f19334
commit d4ac26ec49
2 changed files with 141 additions and 17 deletions
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157
target/linux/generic/files/drivers/net/phy/rtl8366_smi.c
View file

@ -199,7 +199,7 @@ static int rtl8366_smi_read_byte1(struct rtl8366_smi *smi, u8 *data)
return 0;
}
int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
static int __rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
{
unsigned long flags;
u8 lo = 0;
@ -240,6 +240,101 @@ int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
return ret;
}
/* Read/write via mdiobus */
#define MDC_MDIO_CTRL0_REG 31
#define MDC_MDIO_START_REG 29
#define MDC_MDIO_CTRL1_REG 21
#define MDC_MDIO_ADDRESS_REG 23
#define MDC_MDIO_DATA_WRITE_REG 24
#define MDC_MDIO_DATA_READ_REG 25
#define MDC_MDIO_START_OP 0xFFFF
#define MDC_MDIO_ADDR_OP 0x000E
#define MDC_MDIO_READ_OP 0x0001
#define MDC_MDIO_WRITE_OP 0x0003
#define MDC_REALTEK_PHY_ADDR 0x0
int __rtl8366_mdio_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
{
u32 phy_id = MDC_REALTEK_PHY_ADDR;
struct mii_bus *mbus = smi->ext_mbus;
BUG_ON(in_interrupt());
mutex_lock(&mbus->mdio_lock);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write address control code to register 31 */
mbus->write(mbus, phy_id, MDC_MDIO_CTRL0_REG, MDC_MDIO_ADDR_OP);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write address to register 23 */
mbus->write(mbus, phy_id, MDC_MDIO_ADDRESS_REG, addr);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write read control code to register 21 */
mbus->write(mbus, phy_id, MDC_MDIO_CTRL1_REG, MDC_MDIO_READ_OP);
/* Write Start command to register 29 */
mbus->write(smi->ext_mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Read data from register 25 */
*data = mbus->read(mbus, phy_id, MDC_MDIO_DATA_READ_REG);
mutex_unlock(&mbus->mdio_lock);
return 0;
}
static int __rtl8366_mdio_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
{
u32 phy_id = MDC_REALTEK_PHY_ADDR;
struct mii_bus *mbus = smi->ext_mbus;
BUG_ON(in_interrupt());
mutex_lock(&mbus->mdio_lock);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write address control code to register 31 */
mbus->write(mbus, phy_id, MDC_MDIO_CTRL0_REG, MDC_MDIO_ADDR_OP);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write address to register 23 */
mbus->write(mbus, phy_id, MDC_MDIO_ADDRESS_REG, addr);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write data to register 24 */
mbus->write(mbus, phy_id, MDC_MDIO_DATA_WRITE_REG, data);
/* Write Start command to register 29 */
mbus->write(mbus, phy_id, MDC_MDIO_START_REG, MDC_MDIO_START_OP);
/* Write data control code to register 21 */
mbus->write(mbus, phy_id, MDC_MDIO_CTRL1_REG, MDC_MDIO_WRITE_OP);
mutex_unlock(&mbus->mdio_lock);
return 0;
}
int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
{
if (smi->ext_mbus)
return __rtl8366_mdio_read_reg(smi, addr, data);
else
return __rtl8366_smi_read_reg(smi, addr, data);
}
EXPORT_SYMBOL_GPL(rtl8366_smi_read_reg);
static int __rtl8366_smi_write_reg(struct rtl8366_smi *smi,
@ -291,7 +386,10 @@ static int __rtl8366_smi_write_reg(struct rtl8366_smi *smi,
int rtl8366_smi_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
{
return __rtl8366_smi_write_reg(smi, addr, data, true);
if (smi->ext_mbus)
return __rtl8366_mdio_write_reg(smi, addr, data);
else
return __rtl8366_smi_write_reg(smi, addr, data, true);
}
EXPORT_SYMBOL_GPL(rtl8366_smi_write_reg);
@ -1282,18 +1380,20 @@ static int __rtl8366_smi_init(struct rtl8366_smi *smi, const char *name)
{
int err;
err = gpio_request(smi->gpio_sda, name);
if (err) {
printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
smi->gpio_sda, err);
goto err_out;
}
if (!smi->ext_mbus) {
err = gpio_request(smi->gpio_sda, name);
if (err) {
printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
smi->gpio_sda, err);
goto err_out;
}
err = gpio_request(smi->gpio_sck, name);
if (err) {
printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
smi->gpio_sck, err);
goto err_free_sda;
err = gpio_request(smi->gpio_sck, name);
if (err) {
printk(KERN_ERR "rtl8366_smi: gpio_request failed for %u, err=%d\n",
smi->gpio_sck, err);
goto err_free_sda;
}
}
spin_lock_init(&smi->lock);
@ -1317,8 +1417,10 @@ static void __rtl8366_smi_cleanup(struct rtl8366_smi *smi)
if (smi->hw_reset)
smi->hw_reset(smi, true);
gpio_free(smi->gpio_sck);
gpio_free(smi->gpio_sda);
if (!smi->ext_mbus) {
gpio_free(smi->gpio_sck);
gpio_free(smi->gpio_sda);
}
}
enum rtl8366_type rtl8366_smi_detect(struct rtl8366_platform_data *pdata)
@ -1371,8 +1473,11 @@ int rtl8366_smi_init(struct rtl8366_smi *smi)
if (err)
goto err_out;
dev_info(smi->parent, "using GPIO pins %u (SDA) and %u (SCK)\n",
smi->gpio_sda, smi->gpio_sck);
if (!smi->ext_mbus)
dev_info(smi->parent, "using GPIO pins %u (SDA) and %u (SCK)\n",
smi->gpio_sda, smi->gpio_sck);
else
dev_info(smi->parent, "using MDIO bus '%s'\n", smi->ext_mbus->name);
err = smi->ops->detect(smi);
if (err) {
@ -1437,7 +1542,25 @@ int rtl8366_smi_probe_of(struct platform_device *pdev, struct rtl8366_smi *smi)
{
int sck = of_get_named_gpio(pdev->dev.of_node, "gpio-sck", 0);
int sda = of_get_named_gpio(pdev->dev.of_node, "gpio-sda", 0);
struct device_node *np = pdev->dev.of_node;
struct device_node *mdio_node;
mdio_node = of_parse_phandle(np, "mii-bus", 0);
if (!mdio_node) {
dev_err(&pdev->dev, "cannot find mdio node phandle");
goto try_gpio;
}
smi->ext_mbus = of_mdio_find_bus(mdio_node);
if (!smi->ext_mbus) {
dev_err(&pdev->dev,
"cannot find mdio bus from bus handle");
goto try_gpio;
}
return 0;
try_gpio:
if (!gpio_is_valid(sck) || !gpio_is_valid(sda)) {
dev_err(&pdev->dev, "gpios missing in devictree\n");
return -EINVAL;

1
target/linux/generic/files/drivers/net/phy/rtl8366_smi.h
View file

@ -63,6 +63,7 @@ struct rtl8366_smi {
u16 dbg_reg;
u8 dbg_vlan_4k_page;
#endif
struct mii_bus *ext_mbus;
};
struct rtl8366_vlan_mc {