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Message-Id: <20211202080527.18520-2-holger.brunck@hitachienergy.com>
Date: Thu, 2 Dec 2021 09:05:27 +0100
From: Holger Brunck <holger.brunck@...achienergy.com>
To: netdev@...r.kernel.org
Cc: Holger Brunck <holger.brunck@...achienergy.com>,
Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
Marek Behún <kabel@...nel.org>
Subject: [v2 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output amplitude configurable
The mv88e6352, mv88e6240 and mv88e6176 have a serdes interface. This patch
allows to configure the output swing to a desired value in the
devicetree node of the port. As the chips only supports eight dedicated
values we return EINVAL if the value in the DTS does not match.
CC: Andrew Lunn <andrew@...n.ch>
CC: Jakub Kicinski <kuba@...nel.org>
CC: Marek Behún <kabel@...nel.org>
Signed-off-by: Holger Brunck <holger.brunck@...achienergy.com>
---
drivers/net/dsa/mv88e6xxx/chip.c | 17 +++++++++++
drivers/net/dsa/mv88e6xxx/chip.h | 4 +++
drivers/net/dsa/mv88e6xxx/serdes.c | 48 ++++++++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx/serdes.h | 5 ++++
4 files changed, 74 insertions(+)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index f00cbf5753b9..b61db6d2c18d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2861,6 +2861,8 @@ static int mv88e6xxx_setup_upstream_port(struct mv88e6xxx_chip *chip, int port)
static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
{
struct dsa_switch *ds = chip->ds;
+ struct dsa_port *dp;
+ int out_amp;
int err;
u16 reg;
@@ -3014,6 +3016,18 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
return err;
}
+ if (chip->info->ops->serdes_set_out_amplitude) {
+ dp = dsa_to_port(ds, port);
+ if (dp &&
+ !of_property_read_u32(dp->dn, "serdes-output-amplitude-mv",
+ &out_amp)) {
+ err = mv88e6352_serdes_set_out_amplitude(chip, port,
+ out_amp);
+ if (err)
+ return err;
+ }
+ }
+
/* Port based VLAN map: give each port the same default address
* database, and allow bidirectional communication between the
* CPU and DSA port(s), and the other ports.
@@ -4076,6 +4090,7 @@ static const struct mv88e6xxx_ops mv88e6176_ops = {
.serdes_irq_status = mv88e6352_serdes_irq_status,
.serdes_get_regs_len = mv88e6352_serdes_get_regs_len,
.serdes_get_regs = mv88e6352_serdes_get_regs,
+ .serdes_set_out_amplitude = mv88e6352_serdes_set_out_amplitude,
.gpio_ops = &mv88e6352_gpio_ops,
.phylink_validate = mv88e6352_phylink_validate,
};
@@ -4356,6 +4371,7 @@ static const struct mv88e6xxx_ops mv88e6240_ops = {
.serdes_irq_status = mv88e6352_serdes_irq_status,
.serdes_get_regs_len = mv88e6352_serdes_get_regs_len,
.serdes_get_regs = mv88e6352_serdes_get_regs,
+ .serdes_set_out_amplitude = mv88e6352_serdes_set_out_amplitude,
.gpio_ops = &mv88e6352_gpio_ops,
.avb_ops = &mv88e6352_avb_ops,
.ptp_ops = &mv88e6352_ptp_ops,
@@ -4762,6 +4778,7 @@ static const struct mv88e6xxx_ops mv88e6352_ops = {
.serdes_get_stats = mv88e6352_serdes_get_stats,
.serdes_get_regs_len = mv88e6352_serdes_get_regs_len,
.serdes_get_regs = mv88e6352_serdes_get_regs,
+ .serdes_set_out_amplitude = mv88e6352_serdes_set_out_amplitude,
.phylink_validate = mv88e6352_phylink_validate,
};
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 8271b8aa7b71..745f6c32dd15 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -586,6 +586,10 @@ struct mv88e6xxx_ops {
void (*serdes_get_regs)(struct mv88e6xxx_chip *chip, int port,
void *_p);
+ /* SERDES SGMII/Fiber Output Amplitude */
+ int (*serdes_set_out_amplitude)(struct mv88e6xxx_chip *chip, int port,
+ int val);
+
/* Address Translation Unit operations */
int (*atu_get_hash)(struct mv88e6xxx_chip *chip, u8 *hash);
int (*atu_set_hash)(struct mv88e6xxx_chip *chip, u8 hash);
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 6ea003678798..9abe6fa07b3b 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -1271,6 +1271,54 @@ void mv88e6390_serdes_get_regs(struct mv88e6xxx_chip *chip, int port, void *_p)
}
}
+struct mv88e6352_serdes_amp_to_val {
+ int mv;
+ u16 regval;
+};
+
+static struct mv88e6352_serdes_amp_to_val mv88e6352_serdes_amp_to_val[] = {
+ /* Mapping of configurable millivolt values to the register value */
+ { 14, 0},
+ { 112, 1},
+ { 210, 2},
+ { 308, 3},
+ { 406, 4},
+ { 504, 5},
+ { 602, 6},
+ { 700, 7},
+};
+
+int mv88e6352_serdes_set_out_amplitude(struct mv88e6xxx_chip *chip, int port,
+ int val)
+{
+ bool found = false;
+ u16 reg;
+ int err;
+ int i;
+
+ if (!mv88e6352_port_has_serdes(chip, port))
+ return -EOPNOTSUPP;
+
+ for (i = 0; i < ARRAY_SIZE(mv88e6352_serdes_amp_to_val); ++i) {
+ if (mv88e6352_serdes_amp_to_val[i].mv == val) {
+ reg = mv88e6352_serdes_amp_to_val[i].regval;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ return -EINVAL;
+
+ err = mv88e6352_serdes_read(chip, MV88E6352_SERDES_SPEC_CTRL2, ®);
+ if (err)
+ return err;
+
+ reg = (reg & MV88E6352_SERDES_OUT_AMP_MASK) | val;
+
+ return mv88e6352_serdes_write(chip, MV88E6352_SERDES_SPEC_CTRL2, reg);
+}
+
static int mv88e6393x_serdes_port_errata(struct mv88e6xxx_chip *chip, int lane)
{
u16 reg, pcs;
diff --git a/drivers/net/dsa/mv88e6xxx/serdes.h b/drivers/net/dsa/mv88e6xxx/serdes.h
index cbb3ba30caea..4bc39d06060b 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.h
+++ b/drivers/net/dsa/mv88e6xxx/serdes.h
@@ -27,6 +27,8 @@
#define MV88E6352_SERDES_INT_FIBRE_ENERGY BIT(4)
#define MV88E6352_SERDES_INT_STATUS 0x13
+#define MV88E6352_SERDES_SPEC_CTRL2 0x1a
+#define MV88E6352_SERDES_OUT_AMP_MASK 0xfffc
#define MV88E6341_PORT5_LANE 0x15
@@ -172,6 +174,9 @@ void mv88e6352_serdes_get_regs(struct mv88e6xxx_chip *chip, int port, void *_p);
int mv88e6390_serdes_get_regs_len(struct mv88e6xxx_chip *chip, int port);
void mv88e6390_serdes_get_regs(struct mv88e6xxx_chip *chip, int port, void *_p);
+int mv88e6352_serdes_set_out_amplitude(struct mv88e6xxx_chip *chip, int port,
+ int val);
+
/* Return the (first) SERDES lane address a port is using, -errno otherwise. */
static inline int mv88e6xxx_serdes_get_lane(struct mv88e6xxx_chip *chip,
int port)
--
2.34.0
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