[PATCH net-next 04/12] net: pse-pd: tps23881: Add support for power limit and measurement features

Kory Maincent
2024-10-02T16:29:10Z

From: Kory Maincent (Dent Project) <kory.maincent@bootlin.com>

Expand PSE callbacks to support the newly introduced
pi_get/set_current_limit() and pi_get_voltage() functions. These callbacks
allow for power limit configuration in the TPS23881 controller.

Additionally, the patch includes the detected class, the current power
delivered and the power limit ranges in the status returned, providing more
comprehensive PoE status reporting.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---
drivers/net/pse-pd/tps23881.c | 314 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 314 insertions(+)

diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
index fdf996f5d1f8..e05b45cdc9f8 100644
--- a/drivers/net/pse-pd/tps23881.c
+++ b/drivers/net/pse-pd/tps23881.c
@@ -25,17 +25,29 @@
#define TPS23881_REG_GEN_MASK 0x17
#define TPS23881_REG_NBITACC BIT(5)
#define TPS23881_REG_PW_EN 0x19
+#define TPS23881_REG_2PAIR_POL1 0x1e
#define TPS23881_REG_PORT_MAP 0x26
#define TPS23881_REG_PORT_POWER 0x29
+#define TPS23881_REG_4PAIR_POL1 0x2a
+#define TPS23881_REG_INPUT_V 0x2e
+#define TPS23881_REG_CHAN1_A 0x30
+#define TPS23881_REG_CHAN1_V 0x32
#define TPS23881_REG_POEPLUS 0x40
#define TPS23881_REG_TPON BIT(0)
#define TPS23881_REG_FWREV 0x41
#define TPS23881_REG_DEVID 0x43
#define TPS23881_REG_DEVID_MASK 0xF0
#define TPS23881_DEVICE_ID 0x02
+#define TPS23881_REG_CHAN1_CLASS 0x4c
#define TPS23881_REG_SRAM_CTRL 0x60
#define TPS23881_REG_SRAM_DATA 0x61

+#define TPS23881_UV_STEP 3662
+#define TPS23881_MAX_UV 60000000
+#define TPS23881_NA_STEP 70190
+#define TPS23881_MAX_UA 1150000
+#define TPS23881_MW_STEP 500
+
struct tps23881_port_desc {
u8 chan[2];
bool is_4p;
@@ -151,6 +163,175 @@ static int tps23881_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
return enabled;
}

+static int tps23881_pi_get_voltage(struct pse_controller_dev *pcdev, int id)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ struct i2c_client *client = priv->client;
+ int ret, reg;
+ u8 chan;
+ u64 uV;
+
+ /* Read Voltage only at one of the 2-pair ports */
+ chan = priv->port[id].chan[0];
+ if (chan < 4)
+ /* Registers 0x32 0x36 0x3a 0x3e */
+ reg = TPS23881_REG_CHAN1_V + chan * 4;
+ else
+ /* Registers 0x33 0x37 0x3b 0x3f */
+ reg = TPS23881_REG_CHAN1_V + 1 + (chan % 4) * 4;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ uV = ret;
+ uV *= TPS23881_UV_STEP;
+ if (uV > TPS23881_MAX_UV) {
+ dev_err(&client->dev, "voltage read out of range\n");
+ return -ERANGE;
+ }
+
+ return (int)uV;
+}
+
+static int
+tps23881_pi_get_chan_current(struct tps23881_priv *priv, u8 chan)
+{
+ struct i2c_client *client = priv->client;
+ int reg, ret;
+ u64 tmp_64;
+
+ if (chan < 4)
+ /* Registers 0x30 0x34 0x38 0x3c */
+ reg = TPS23881_REG_CHAN1_A + chan * 4;
+ else
+ /* Registers 0x31 0x35 0x39 0x3d */
+ reg = TPS23881_REG_CHAN1_A + 1 + (chan % 4) * 4;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ tmp_64 = ret;
+ tmp_64 *= TPS23881_NA_STEP;
+ /* uA = nA / 1000 */
+ tmp_64 = DIV_ROUND_CLOSEST_ULL(tmp_64, 1000);
+ if (tmp_64 > TPS23881_MAX_UA) {
+ dev_err(&client->dev, "current read out of range\n");
+ return -ERANGE;
+ }
+ return (int)tmp_64;
+}
+
+static int
+tps23881_pi_get_power(struct tps23881_priv *priv, unsigned long id)
+{
+ int ret, uV, uA;
+ u64 tmp_64;
+ u8 chan;
+
+ ret = tps23881_pi_get_voltage(&priv->pcdev, id);
+ if (ret < 0)
+ return ret;
+ uV = ret;
+
+ chan = priv->port[id].chan[0];
+ ret = tps23881_pi_get_chan_current(priv, chan);
+ if (ret < 0)
+ return ret;
+ uA = ret;
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ ret = tps23881_pi_get_chan_current(priv, chan);
+ if (ret < 0)
+ return ret;
+ uA += ret;
+ }
+
+ tmp_64 = uV;
+ tmp_64 *= uA;
+ /* mW = uV * uA / 1000000000 */
+ return DIV_ROUND_CLOSEST_ULL(tmp_64, 1000000000);
+}
+
+static int
+tps23881_pi_get_pw_limit_chan(struct tps23881_priv *priv, u8 chan)
+{
+ struct i2c_client *client = priv->client;
+ int ret, reg, mW;
+
+ reg = TPS23881_REG_2PAIR_POL1 + (chan % 4);
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (chan < 4)
+ mW = (ret & 0xff) * TPS23881_MW_STEP;
+ else
+ mW = (ret >> 8) * TPS23881_MW_STEP;
+
+ return mW;
+}
+
+static int tps23881_pi_get_pw_limit(struct tps23881_priv *priv, int id)
+{
+ int ret, mW;
+ u8 chan;
+
+ chan = priv->port[id].chan[0];
+ ret = tps23881_pi_get_pw_limit_chan(priv, chan);
+ if (ret < 0)
+ return ret;
+
+ mW = ret;
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ ret = tps23881_pi_get_pw_limit_chan(priv, chan);
+ if (ret < 0)
+ return ret;
+ mW += ret;
+ }
+
+ return mW;
+}
+
+static int tps23881_pi_get_max_pw_limit(struct tps23881_priv *priv, int id)
+{
+ int ret, uV;
+ u64 tmp_64;
+
+ ret = tps23881_pi_get_voltage(&priv->pcdev, id);
+ if (ret < 0)
+ return ret;
+ uV = ret;
+
+ tmp_64 = uV;
+ tmp_64 *= MAX_PI_CURRENT;
+ /* mW = uV * uA / 1000000000 */
+ return DIV_ROUND_CLOSEST_ULL(tmp_64, 1000000000);
+}
+
+static int tps23881_pi_get_class(struct tps23881_priv *priv, int id)
+{
+ struct i2c_client *client = priv->client;
+ int ret, reg, class;
+ u8 chan;
+
+ chan = priv->port[id].chan[0];
+ reg = TPS23881_REG_CHAN1_CLASS + (chan % 4);
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (chan < 4)
+ class = ret >> 4;
+ else
+ class = ret >> 12;
+
+ return class;
+}
+
static int tps23881_ethtool_get_status(struct pse_controller_dev *pcdev,
unsigned long id,
struct netlink_ext_ack *extack,
@@ -198,6 +379,35 @@ static int tps23881_ethtool_get_status(struct pse_controller_dev *pcdev,
else
status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;

+ ret = tps23881_pi_get_power(priv, id);
+ if (ret < 0)
+ return ret;
+ status->c33_actual_pw = ret;
+
+ status->c33_pw_limit_ranges = kzalloc(sizeof(*status->c33_pw_limit_ranges),
+ GFP_KERNEL);
+ if (!status->c33_pw_limit_ranges)
+ return -ENOMEM;
+
+ status->c33_actual_pw = ret;
+
+ ret = tps23881_pi_get_max_pw_limit(priv, id);
+ if (ret < 0)
+ return ret;
+ status->c33_pw_limit_nb_ranges = 1;
+ status->c33_pw_limit_ranges->min = 2000;
+ status->c33_pw_limit_ranges->max = ret;
+
+ ret = tps23881_pi_get_pw_limit(priv, id);
+ if (ret < 0)
+ return ret;
+ status->c33_avail_pw_limit = ret;
+
+ ret = tps23881_pi_get_class(priv, id);
+ if (ret < 0)
+ return ret;
+ status->c33_pw_class = ret;
+
return 0;
}

@@ -614,12 +824,116 @@ static int tps23881_setup_pi_matrix(struct pse_controller_dev *pcdev)
return ret;
}

+static int tps23881_pi_get_current_limit(struct pse_controller_dev *pcdev,
+ int id)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ int ret, mW, uV;
+ u64 tmp_64;
+
+ ret = tps23881_pi_get_pw_limit(priv, id);
+ if (ret < 0)
+ return ret;
+ mW = ret;
+
+ ret = tps23881_pi_get_voltage(pcdev, id);
+ if (ret < 0)
+ return ret;
+ uV = ret;
+
+ tmp_64 = mW;
+ tmp_64 *= 1000000000ull;
+ /* uA = mW * 1000000000 / uV */
+ return DIV_ROUND_CLOSEST_ULL(tmp_64, uV);
+}
+
+static int
+tps23881_pi_set_2p_pw_limit(struct tps23881_priv *priv, u8 chan, u8 pol)
+{
+ struct i2c_client *client = priv->client;
+ int ret, reg;
+ u16 val;
+
+ reg = TPS23881_REG_2PAIR_POL1 + (chan % 4);
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (chan < 4)
+ val = (ret & 0xff00) | pol;
+ else
+ val = (ret & 0xff) | (pol << 8);
+
+ return i2c_smbus_write_word_data(client, reg, val);
+}
+
+static int
+tps23881_pi_set_4p_pw_limit(struct tps23881_priv *priv, u8 chan, u8 pol)
+{
+ struct i2c_client *client = priv->client;
+ int ret, reg;
+ u16 val;
+
+ if ((chan % 4) < 2)
+ reg = TPS23881_REG_4PAIR_POL1;
+ else
+ reg = TPS23881_REG_4PAIR_POL1 + 1;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (chan < 4)
+ val = (ret & 0xff00) | pol;
+ else
+ val = (ret & 0xff) | (pol << 8);
+
+ return i2c_smbus_write_word_data(client, reg, val);
+}
+
+static int tps23881_pi_set_current_limit(struct pse_controller_dev *pcdev,
+ int id, int max_uA)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ u8 chan, pw_pol;
+ int ret, mW;
+ u64 tmp_64;
+
+ ret = tps23881_pi_get_voltage(pcdev, id);
+ if (ret < 0)
+ return ret;
+
+ tmp_64 = ret;
+ tmp_64 *= max_uA;
+ /* mW = uV * uA / 1000000000 */
+ mW = DIV_ROUND_CLOSEST_ULL(tmp_64, 1000000000);
+ pw_pol = DIV_ROUND_CLOSEST_ULL(mW, TPS23881_MW_STEP);
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[0];
+ /* One chan is enough to configure the PI power limit */
+ ret = tps23881_pi_set_4p_pw_limit(priv, chan, pw_pol);
+ if (ret < 0)
+ return ret;
+ } else {
+ chan = priv->port[id].chan[0];
+ ret = tps23881_pi_set_2p_pw_limit(priv, chan, pw_pol);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
static const struct pse_controller_ops tps23881_ops = {
.setup_pi_matrix = tps23881_setup_pi_matrix,
.pi_enable = tps23881_pi_enable,
.pi_disable = tps23881_pi_disable,
.pi_is_enabled = tps23881_pi_is_enabled,
.ethtool_get_status = tps23881_ethtool_get_status,
+ .pi_get_voltage = tps23881_pi_get_voltage,
+ .pi_get_current_limit = tps23881_pi_get_current_limit,
+ .pi_set_current_limit = tps23881_pi_set_current_limit,
};

static const char fw_parity_name[] = "ti/tps23881/tps23881-parity-14.bin";

--
2.34.1