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Date: Wed, 30 Nov 2016 17:59:29 -0500
From: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
"David S. Miller" <davem@...emloft.net>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: [PATCH net-next 5/6] net: dsa: mv88e6xxx: add helper for switch ready
All Marvell switches (even 88E6060) have a bit to inform that the switch
is ready to accept frames. Implement that in mv88e6xxx_g1_init_ready().
If the switch has a PPU, we must wait until its state is active polling,
otherwise we cannot access PortStatus registers. Nicely wrap all that in
a mv88e6xxx_wait_switch_ready() helper for the switch reset code.
Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
---
drivers/net/dsa/mv88e6xxx/chip.c | 52 +++++++++++++++++++++--------------
drivers/net/dsa/mv88e6xxx/global1.c | 15 ++++++++++
drivers/net/dsa/mv88e6xxx/global1.h | 1 +
drivers/net/dsa/mv88e6xxx/mv88e6xxx.h | 1 +
4 files changed, 48 insertions(+), 21 deletions(-)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index db4014c..f5d5370 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2363,6 +2363,36 @@ static void mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port)
mutex_unlock(&chip->reg_lock);
}
+static int mv88e6xxx_wait_switch_ready(struct mv88e6xxx_chip *chip)
+{
+ const unsigned long timeout = jiffies + 1 * HZ;
+ bool ready;
+ int err;
+
+ /* Wait up to 1 second for switch to be ready.
+ * The switch is ready 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_init_ready(chip, &ready);
+ if (err)
+ return err;
+
+ if (ready)
+ break;
+
+ usleep_range(1000, 2000);
+ }
+
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+
+ /* If there is a PPU, the PortStatus registers must not be written to by
+ * software until the PPU is active polling, so wait until then.
+ */
+ return mv88e6xxx_ppu_wait(chip, true);
+}
+
static int mv88e6xxx_software_reset(struct mv88e6xxx_chip *chip)
{
if (chip->info->ops->reset)
@@ -2406,10 +2436,6 @@ 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);
@@ -2422,23 +2448,7 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_chip *chip)
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, ®);
- 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_wait_switch_ready(chip);
}
static int mv88e6xxx_serdes_power_on(struct mv88e6xxx_chip *chip)
diff --git a/drivers/net/dsa/mv88e6xxx/global1.c b/drivers/net/dsa/mv88e6xxx/global1.c
index 371d96a..4d69cec 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.c
+++ b/drivers/net/dsa/mv88e6xxx/global1.c
@@ -66,6 +66,21 @@ int mv88e6352_g1_ppu_polling(struct mv88e6xxx_chip *chip, bool *polling)
return 0;
}
+int mv88e6xxx_g1_init_ready(struct mv88e6xxx_chip *chip, bool *ready)
+{
+ u16 val;
+ int err;
+
+ /* Check the value of the InitReady bit 11 */
+ err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &val);
+ if (err)
+ return err;
+
+ *ready = !!(val & GLOBAL_STATUS_INIT_READY);
+
+ return 0;
+}
+
/* Offset 0x04: Switch Global Control Register */
int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip)
diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index cdccf473..6f0fb7f 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -22,6 +22,7 @@ int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask);
int mv88e6185_g1_ppu_polling(struct mv88e6xxx_chip *chip, bool *polling);
int mv88e6352_g1_ppu_polling(struct mv88e6xxx_chip *chip, bool *polling);
+int mv88e6xxx_g1_init_ready(struct mv88e6xxx_chip *chip, bool *ready);
int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip);
int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip);
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index 9ae228c..cd0f414 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -180,6 +180,7 @@
#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
--
2.10.2
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