[PATCH v3 net-next v3 3/4] net: dsa: mv88e6xxx: add a soft reset operation

From: Vivien Didelot
Date: Mon Dec 05 2016 - 17:31:44 EST

Marvell chips have different way to issue a software reset.

Old chips (such as 88E6060) have a reset bit in an ATU control register.

Newer chips moved this bit in a Global control register. Chips with
controllable PPU should reset the PPU when resetting the switch.

Add a new reset operation to implement these differences and introduce a
mv88e6xxx_software_reset() helper to wrap it conveniently.

Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
---
drivers/net/dsa/mv88e6xxx/chip.c | 72 ++++++++++----------
drivers/net/dsa/mv88e6xxx/global1.c | 121 ++++++++++++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx/global1.h | 4 ++
drivers/net/dsa/mv88e6xxx/mv88e6xxx.h | 15 +++--
4 files changed, 172 insertions(+), 40 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 27dfb5d..5aae5d7 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -545,7 +545,8 @@ static int mv88e6xxx_ppu_disable(struct mv88e6xxx_chip *chip)
return err;

usleep_range(1000, 2000);
- if ((val & GLOBAL_STATUS_PPU_MASK) != GLOBAL_STATUS_PPU_POLLING)
+ val &= GLOBAL_STATUS_PPU_STATE_MASK;
+ if (val != GLOBAL_STATUS_PPU_STATE_POLLING)
return 0;
}

@@ -572,7 +573,8 @@ static int mv88e6xxx_ppu_enable(struct mv88e6xxx_chip *chip)
return err;

usleep_range(1000, 2000);
- if ((val & GLOBAL_STATUS_PPU_MASK) == GLOBAL_STATUS_PPU_POLLING)
+ val &= GLOBAL_STATUS_PPU_STATE_MASK;
+ if (val == GLOBAL_STATUS_PPU_STATE_POLLING)
return 0;
}

@@ -2356,6 +2358,14 @@ static void mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port)
mutex_unlock(&chip->reg_lock);
}

+static int mv88e6xxx_software_reset(struct mv88e6xxx_chip *chip)
+{
+ if (chip->info->ops->reset)
+ return chip->info->ops->reset(chip);
+
+ return 0;
+}
+
static void mv88e6xxx_hardware_reset(struct mv88e6xxx_chip *chip)
{
struct gpio_desc *gpiod = chip->reset;
@@ -2391,10 +2401,6 @@ static int mv88e6xxx_disable_ports(struct mv88e6xxx_chip *chip)

static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)
{
- bool ppu_active = mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU_ACTIVE);
- u16 is_reset = (ppu_active ? 0x8800 : 0xc800);
- unsigned long timeout;
- u16 reg;
int err;

err = mv88e6xxx_disable_ports(chip);
@@ -2403,34 +2409,7 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)

mv88e6xxx_hardware_reset(chip);

- /* Reset the switch. Keep the PPU active if requested. The PPU
- * needs to be active to support indirect phy register access
- * through global registers 0x18 and 0x19.
- */
- if (ppu_active)
- err = mv88e6xxx_g1_write(chip, 0x04, 0xc000);
- else
- err = mv88e6xxx_g1_write(chip, 0x04, 0xc400);
- if (err)
- return err;
-
- /* Wait up to one second for reset to complete. */
- timeout = jiffies + 1 * HZ;
- while (time_before(jiffies, timeout)) {
- err = mv88e6xxx_g1_read(chip, 0x00, &reg);
- if (err)
- return err;
-
- if ((reg & is_reset) == is_reset)
- break;
- usleep_range(1000, 2000);
- }
- if (time_after(jiffies, timeout))
- err = -ETIMEDOUT;
- else
- err = 0;
-
- return err;
+ return mv88e6xxx_software_reset(chip);
}

static int mv88e6xxx_serdes_power_on(struct mv88e6xxx_chip *chip)
@@ -3244,6 +3223,7 @@ static const struct mv88e6xxx_ops mv88e6085_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6185_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6095_ops = {
@@ -3261,6 +3241,7 @@ static const struct mv88e6xxx_ops mv88e6095_ops = {
.stats_get_strings = mv88e6095_stats_get_strings,
.stats_get_stats = mv88e6095_stats_get_stats,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6185_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6097_ops = {
@@ -3285,6 +3266,7 @@ static const struct mv88e6xxx_ops mv88e6097_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6123_ops = {
@@ -3304,6 +3286,7 @@ static const struct mv88e6xxx_ops mv88e6123_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6131_ops = {
@@ -3328,6 +3311,7 @@ static const struct mv88e6xxx_ops mv88e6131_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6185_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6161_ops = {
@@ -3352,6 +3336,7 @@ static const struct mv88e6xxx_ops mv88e6161_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6165_ops = {
@@ -3369,6 +3354,7 @@ static const struct mv88e6xxx_ops mv88e6165_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6171_ops = {
@@ -3394,6 +3380,7 @@ static const struct mv88e6xxx_ops mv88e6171_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6172_ops = {
@@ -3421,6 +3408,7 @@ static const struct mv88e6xxx_ops mv88e6172_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6175_ops = {
@@ -3446,6 +3434,7 @@ static const struct mv88e6xxx_ops mv88e6175_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6176_ops = {
@@ -3473,6 +3462,7 @@ static const struct mv88e6xxx_ops mv88e6176_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6185_ops = {
@@ -3493,6 +3483,7 @@ static const struct mv88e6xxx_ops mv88e6185_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6185_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6190_ops = {
@@ -3517,6 +3508,7 @@ static const struct mv88e6xxx_ops mv88e6190_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6190x_ops = {
@@ -3541,6 +3533,7 @@ static const struct mv88e6xxx_ops mv88e6190x_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6191_ops = {
@@ -3565,6 +3558,7 @@ static const struct mv88e6xxx_ops mv88e6191_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6240_ops = {
@@ -3592,6 +3586,7 @@ static const struct mv88e6xxx_ops mv88e6240_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6290_ops = {
@@ -3616,6 +3611,7 @@ static const struct mv88e6xxx_ops mv88e6290_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6320_ops = {
@@ -3642,6 +3638,7 @@ static const struct mv88e6xxx_ops mv88e6320_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6321_ops = {
@@ -3667,6 +3664,7 @@ static const struct mv88e6xxx_ops mv88e6321_ops = {
.stats_get_stats = mv88e6320_stats_get_stats,
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6350_ops = {
@@ -3692,6 +3690,7 @@ static const struct mv88e6xxx_ops mv88e6350_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6351_ops = {
@@ -3717,6 +3716,7 @@ static const struct mv88e6xxx_ops mv88e6351_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6352_ops = {
@@ -3744,6 +3744,7 @@ static const struct mv88e6xxx_ops mv88e6352_ops = {
.g1_set_cpu_port = mv88e6095_g1_set_cpu_port,
.g1_set_egress_port = mv88e6095_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6095_g2_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6390_ops = {
@@ -3770,6 +3771,7 @@ static const struct mv88e6xxx_ops mv88e6390_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6390x_ops = {
@@ -3796,6 +3798,7 @@ static const struct mv88e6xxx_ops mv88e6390x_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static const struct mv88e6xxx_ops mv88e6391_ops = {
@@ -3820,6 +3823,7 @@ static const struct mv88e6xxx_ops mv88e6391_ops = {
.g1_set_cpu_port = mv88e6390_g1_set_cpu_port,
.g1_set_egress_port = mv88e6390_g1_set_egress_port,
.mgmt_rsvd2cpu = mv88e6390_g1_mgmt_rsvd2cpu,
+ .reset = mv88e6352_g1_reset,
};

static int mv88e6xxx_verify_madatory_ops(struct mv88e6xxx_chip *chip,
diff --git a/drivers/net/dsa/mv88e6xxx/global1.c b/drivers/net/dsa/mv88e6xxx/global1.c
index 44136ee..c868eb0 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.c
+++ b/drivers/net/dsa/mv88e6xxx/global1.c
@@ -33,6 +33,127 @@ int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
return mv88e6xxx_wait(chip, chip->info->global1_addr, reg, mask);
}

+/* Offset 0x00: Switch Global Status Register */
+
+static int mv88e6185_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
+{
+ u16 state;
+ int i, err;
+
+ for (i = 0; i < 16; ++i) {
+ err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
+ if (err)
+ return err;
+
+ /* Check the value of the PPUState bits 15:14 */
+ state &= GLOBAL_STATUS_PPU_STATE_MASK;
+ if (state == GLOBAL_STATUS_PPU_STATE_POLLING)
+ return 0;
+
+ usleep_range(1000, 2000);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int mv88e6352_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
+{
+ u16 state;
+ int i, err;
+
+ for (i = 0; i < 16; ++i) {
+ err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
+ if (err)
+ return err;
+
+ /* Check the value of the PPUState (or InitState) bit 15 */
+ if (state & GLOBAL_STATUS_PPU_STATE)
+ return 0;
+
+ usleep_range(1000, 2000);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int mv88e6xxx_g1_wait_init_ready(struct mv88e6xxx_chip *chip)
+{
+ const unsigned long timeout = jiffies + 1 * HZ;
+ u16 val;
+ int err;
+
+ /* Wait up to 1 second for the switch to be ready. The InitReady bit 11
+ * is set to a one when all units inside the device (ATU, VTU, etc.)
+ * have finished their initialization and are ready to accept frames.
+ */
+ while (time_before(jiffies, timeout)) {
+ err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &val);
+ if (err)
+ return err;
+
+ if (val & GLOBAL_STATUS_INIT_READY)
+ break;
+
+ usleep_range(1000, 2000);
+ }
+
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+/* Offset 0x04: Switch Global Control Register */
+
+int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip)
+{
+ u16 val;
+ int err;
+
+ /* Set the SWReset bit 15 along with the PPUEn bit 14, to also restart
+ * the PPU, including re-doing PHY detection and initialization
+ */
+ err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
+ if (err)
+ return err;
+
+ val |= GLOBAL_CONTROL_SW_RESET;
+ val |= GLOBAL_CONTROL_PPU_ENABLE;
+
+ err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, val);
+ if (err)
+ return err;
+
+ err = mv88e6xxx_g1_wait_init_ready(chip);
+ if (err)
+ return err;
+
+ return mv88e6185_g1_wait_ppu_polling(chip);
+}
+
+int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip)
+{
+ u16 val;
+ int err;
+
+ /* Set the SWReset bit 15 */
+ err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
+ if (err)
+ return err;
+
+ val |= GLOBAL_CONTROL_SW_RESET;
+
+ err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL, val);
+ if (err)
+ return err;
+
+ err = mv88e6xxx_g1_wait_init_ready(chip);
+ if (err)
+ return err;
+
+ return mv88e6352_g1_wait_ppu_polling(chip);
+}
+
/* Offset 0x1a: Monitor Control */
/* Offset 0x1a: Monitor & MGMT Control on some devices */

diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index cb61378..9fca215 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -19,6 +19,10 @@
int mv88e6xxx_g1_read(struct mv88e6xxx_chip *chip, int reg, u16 *val);
int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val);
int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask);
+
+int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip);
+int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip);
+
int mv88e6xxx_g1_stats_wait(struct mv88e6xxx_chip *chip);
int mv88e6xxx_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port);
int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port);
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index 13c7cc4..f201d13 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -193,12 +193,12 @@

#define GLOBAL_STATUS 0x00
#define GLOBAL_STATUS_PPU_STATE BIT(15) /* 6351 and 6171 */
-/* Two bits for 6165, 6185 etc */
-#define GLOBAL_STATUS_PPU_MASK (0x3 << 14)
-#define GLOBAL_STATUS_PPU_DISABLED_RST (0x0 << 14)
-#define GLOBAL_STATUS_PPU_INITIALIZING (0x1 << 14)
-#define GLOBAL_STATUS_PPU_DISABLED (0x2 << 14)
-#define GLOBAL_STATUS_PPU_POLLING (0x3 << 14)
+#define GLOBAL_STATUS_PPU_STATE_MASK (0x3 << 14) /* 6165 6185 */
+#define GLOBAL_STATUS_PPU_STATE_DISABLED_RST (0x0 << 14)
+#define GLOBAL_STATUS_PPU_STATE_INITIALIZING (0x1 << 14)
+#define GLOBAL_STATUS_PPU_STATE_DISABLED (0x2 << 14)
+#define GLOBAL_STATUS_PPU_STATE_POLLING (0x3 << 14)
+#define GLOBAL_STATUS_INIT_READY BIT(11)
#define GLOBAL_STATUS_IRQ_AVB 8
#define GLOBAL_STATUS_IRQ_DEVICE 7
#define GLOBAL_STATUS_IRQ_STATS 6
@@ -792,6 +792,9 @@ struct mv88e6xxx_ops {
int (*phy_write)(struct mv88e6xxx_chip *chip, int addr, int reg,
u16 val);

+ /* Switch Software Reset */
+ int (*reset)(struct mv88e6xxx_chip *chip);
+
/* RGMII Receive/Transmit Timing Control
* Add delay on PHY_INTERFACE_MODE_RGMII_*ID, no delay otherwise.
*/
--
2.10.2