Subject: [linux-sunxi] [PATCH 2/5] phy-sun4i-usb: Add support for the host usb-phys found on the H3 SoC

From: [email-masked] (Hans de Goede)
Date: Sun, 22 Nov 2015 12:29:01 +0100

Hi,

On 11/20/2015 08:49 PM, Priit Laes wrote:
> On Sun, 2015-11-15 at 20:46 +0100, Hans de Goede wrote:
>> From: Reinder de Haan <[email-masked]>
>>
>> Note this commit only adds support for phys 1-3, phy 0, the otg phy,
>> is
>> not yet (fully) supported after this commit.
>
>
> This patch seems to be causing following compile warning:
>
> In file included from include/linux/io.h:25:0,
>                   from drivers/phy/phy-sun4i-usb.c:28:
> drivers/phy/phy-sun4i-usb.c: In function 'sun4i_usb_phy_write': ./arch/arm/include/asm/io.h:94:2: warning: 'phyctl' may be used uninitialized in this function [-Wmaybe-uni
> nitialized]
>    asm volatile("strb %1, %0"
>    ^
> drivers/phy/phy-sun4i-usb.c:172:8: note: 'phyctl' was declared here
>    void *phyctl;

Good catch, thanks the "break;" after the dev_err for the h3 case should be a return (this is a dead code path,
the dev_err is there to avoid people trying to actually use sun4i_usb_phy_write() with the h3 in
the future).

v2 of this patch fixing this is on its way.

Regards,

Hans

>
>>
>> Signed-off-by: Reinder de Haan <[email-masked]>
>> Signed-off-by: Hans de Goede <[email-masked]>
>> ---
>>   .../devicetree/bindings/phy/sun4i-usb-phy.txt      |  1 +
>>   drivers/phy/phy-sun4i-usb.c                        | 67
>> +++++++++++++++++-----
>>   2 files changed, 53 insertions(+), 15 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> index 0cebf74..95736d7 100644
>> --- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> @@ -9,6 +9,7 @@ Required properties:
>>     * allwinner,sun7i-a20-usb-phy
>>     * allwinner,sun8i-a23-usb-phy
>>     * allwinner,sun8i-a33-usb-phy
>> +  * allwinner,sun8i-h3-usb-phy
>>   - reg : a list of offset + length pairs
>>   - reg-names :
>>     * "phy_ctrl"
>> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-
>> usb.c
>> index b12964b..17f97ab 100644
>> --- a/drivers/phy/phy-sun4i-usb.c
>> +++ b/drivers/phy/phy-sun4i-usb.c
>> @@ -46,6 +46,9 @@
>>   #define REG_PHYBIST			0x08
>>   #define REG_PHYTUNE			0x0c
>>   #define REG_PHYCTL_A33			0x10
>> +#define REG_PHY_UNK_H3			0x20
>> +
>> +#define REG_PMU_UNK_H3			0x10
>>
>>   #define PHYCTL_DATA			BIT(7)
>>
>> @@ -79,7 +82,7 @@
>>   #define PHY_DISCON_TH_SEL		0x2a
>>   #define PHY_SQUELCH_DETECT		0x3c
>>
>> -#define MAX_PHYS			3
>> +#define MAX_PHYS			4
>>
>>   /*
>>    * Note do not raise the debounce time, we must report Vusb high
>> within 100ms
>> @@ -88,12 +91,19 @@
>>   #define DEBOUNCE_TIME			msecs_to_jiffies(50)
>>   #define POLL_TIME			msecs_to_jiffies(250)
>>
>> +enum sun4i_usb_phy_type {
>> +	sun4i_a10_phy,
>> +	sun8i_a33_phy,
>> +	sun8i_h3_phy
>> +};
>> +
>>   struct sun4i_usb_phy_data {
>> +	struct device *dev;
>>   	void __iomem *base;
>>   	struct mutex mutex;
>>   	int num_phys;
>>   	u32 disc_thresh;
>> -	bool has_a33_phyctl;
>> +	enum sun4i_usb_phy_type type;
>>   	struct sun4i_usb_phy {
>>   		struct phy *phy;
>>   		void __iomem *pmu;
>> @@ -164,12 +174,18 @@ static void sun4i_usb_phy_write(struct
>> sun4i_usb_phy *phy, u32 addr, u32 data,
>>
>>   	mutex_lock(&phy_data->mutex);
>>
>> -	if (phy_data->has_a33_phyctl) {
>> +	switch (phy_data->type) {
>> +	case sun4i_a10_phy:
>> +		phyctl = phy_data->base + REG_PHYCTL_A10;
>> +		break;
>> +	case sun8i_a33_phy:
>>   		phyctl = phy_data->base + REG_PHYCTL_A33;
>>   		/* A33 needs us to set phyctl to 0 explicitly */
>>   		writel(0, phyctl);
>> -	} else {
>> -		phyctl = phy_data->base + REG_PHYCTL_A10;
>> +		break;
>> +	case sun8i_h3_phy:
>> +		dev_err(phy_data->dev, "H3 usb_phy_write is not
>> supported\n");
>> +		break;
>>   	}
>>
>>   	for (i = 0; i < len; i++) {
>> @@ -230,6 +246,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>   	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
>>   	struct sun4i_usb_phy_data *data =
>> to_sun4i_usb_phy_data(phy);
>>   	int ret;
>> +	u32 val;
>>
>>   	ret = clk_prepare_enable(phy->clk);
>>   	if (ret)
>> @@ -241,15 +258,26 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>   		return ret;
>>   	}
>>
>> -	/* Enable USB 45 Ohm resistor calibration */
>> -	if (phy->index == 0)
>> -		sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
>> +	if (data->type == sun8i_h3_phy) {
>> +		if (phy->index == 0) {
>> +			val = readl(data->base + REG_PHY_UNK_H3);
>> +			writel(val & ~1, data->base +
>> REG_PHY_UNK_H3);
>> +		}
>> +
>> +		val = readl(phy->pmu + REG_PMU_UNK_H3);
>> +		writel(val & ~2, phy->pmu + REG_PMU_UNK_H3);
>> +	} else {
>> +		/* Enable USB 45 Ohm resistor calibration */
>> +		if (phy->index == 0)
>> +			sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN,
>> 0x01, 1);
>>
>> -	/* Adjust PHY's magnitude and rate */
>> -	sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
>> +		/* Adjust PHY's magnitude and rate */
>> +		sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE,
>> 0x14, 5);
>>
>> -	/* Disconnect threshold adjustment */
>> -	sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data-
>>> disc_thresh, 2);
>> +		/* Disconnect threshold adjustment */
>> +		sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL,
>> +				    data->disc_thresh, 2);
>> +	}
>>
>>   	sun4i_usb_phy_passby(phy, 1);
>>
>> @@ -522,11 +550,14 @@ static int sun4i_usb_phy_probe(struct
>> platform_device *pdev)
>>   	mutex_init(&data->mutex);
>>   	INIT_DELAYED_WORK(&data->detect,
>> sun4i_usb_phy0_id_vbus_det_scan);
>>   	dev_set_drvdata(dev, data);
>> +	data->dev = dev;
>>
>>   	if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-
>> phy") ||
>>   	    of_device_is_compatible(np, "allwinner,sun8i-a23-usb-
>> phy") ||
>>   	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-
>> phy"))
>>   		data->num_phys = 2;
>> +	else if (of_device_is_compatible(np, "allwinner,sun8i-h3-
>> usb-phy"))
>> +		data->num_phys = 4;
>>   	else
>>   		data->num_phys = 3;
>>
>> @@ -538,13 +569,18 @@ static int sun4i_usb_phy_probe(struct
>> platform_device *pdev)
>>
>>   	if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-
>> phy") ||
>>   	    of_device_is_compatible(np, "allwinner,sun8i-a23-usb-
>> phy") ||
>> -	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-
>> phy"))
>> +	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-
>> phy") ||
>> +	    of_device_is_compatible(np, "allwinner,sun8i-h3-usb-
>> phy"))
>>   		dedicated_clocks = true;
>>   	else
>>   		dedicated_clocks = false;
>>
>>   	if (of_device_is_compatible(np, "allwinner,sun8i-a33-usb-
>> phy"))
>> -		data->has_a33_phyctl = true;
>> +		data->type = sun8i_a33_phy;
>> +	else if (of_device_is_compatible(np, "allwinner,sun8i-h3-
>> usb-phy"))
>> +		data->type = sun8i_h3_phy;
>> +	else
>> +		data->type = sun4i_a10_phy;
>>
>>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> "phy_ctrl");
>>   	data->base = devm_ioremap_resource(dev, res);
>> @@ -620,7 +656,7 @@ static int sun4i_usb_phy_probe(struct
>> platform_device *pdev)
>>   			return PTR_ERR(phy->reset);
>>   		}
>>
>> -		if (i) { /* No pmu for usbc0 */
>> +		if (data->type == sun8i_h3_phy || i != 0) {
>>   			snprintf(name, sizeof(name), "pmu%d", i);
>>   			res = platform_get_resource_byname(pdev,
>>   							IORESOURCE_M
>> EM, name);
>> @@ -696,6 +732,7 @@ static const struct of_device_id
>> sun4i_usb_phy_of_match[] = {
>>   	{ .compatible = "allwinner,sun7i-a20-usb-phy" },
>>   	{ .compatible = "allwinner,sun8i-a23-usb-phy" },
>>   	{ .compatible = "allwinner,sun8i-a33-usb-phy" },
>> +	{ .compatible = "allwinner,sun8i-h3-usb-phy" },
>>   	{ },
>>   };
>>   MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
>> --
>> 2.5.0
>>