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sfc: QT2025C: Switch into self-configure mode when not in loopback 

The PHY boots in a mode which is not necessarily optimal.  This change
switches it to self-configure mode (except when in loopback, which
won't work in that mode if an SFP+ module is not present) by rebooting
the PHY's microcontroller, and replicating the sequence of configuration
writes from the boot EEPROM with the appropriate changes.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matthew Slattery 2009-12-23 13:48:04 +00:00 committed by David S. Miller
parent 17d6aeafe9
commit 0d83b2f64c
1 changed files with 119 additions and 0 deletions
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119
drivers/net/sfc/qt202x_phy.c
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@ -33,6 +33,9 @@
#define PCS_FW_HEARTBEAT_REG 0xd7ee
#define PCS_FW_HEARTB_LBN 0
#define PCS_FW_HEARTB_WIDTH 8
#define PCS_FW_PRODUCT_CODE_1 0xd7f0
#define PCS_FW_VERSION_1 0xd7f3
#define PCS_FW_BUILD_1 0xd7f6
#define PCS_UC8051_STATUS_REG 0xd7fd
#define PCS_UC_STATUS_LBN 0
#define PCS_UC_STATUS_WIDTH 8
@ -54,6 +57,7 @@ struct qt202x_phy_data {
enum efx_phy_mode phy_mode;
bool bug17190_in_bad_state;
unsigned long bug17190_timer;
u32 firmware_ver;
};
#define QT2022C2_MAX_RESET_TIME 500
@ -100,6 +104,25 @@ static int qt2025c_wait_reset(struct efx_nic *efx)
return 0;
}
static void qt2025c_firmware_id(struct efx_nic *efx)
{
struct qt202x_phy_data *phy_data = efx->phy_data;
u8 firmware_id[9];
size_t i;
for (i = 0; i < sizeof(firmware_id); i++)
firmware_id[i] = efx_mdio_read(efx, MDIO_MMD_PCS,
PCS_FW_PRODUCT_CODE_1 + i);
EFX_INFO(efx, "QT2025C firmware %xr%d v%d.%d.%d.%d [20%02d-%02d-%02d]\n",
(firmware_id[0] << 8) | firmware_id[1], firmware_id[2],
firmware_id[3] >> 4, firmware_id[3] & 0xf,
firmware_id[4], firmware_id[5],
firmware_id[6], firmware_id[7], firmware_id[8]);
phy_data->firmware_ver = ((firmware_id[3] & 0xf0) << 20) |
((firmware_id[3] & 0x0f) << 16) |
(firmware_id[4] << 8) | firmware_id[5];
}
static void qt2025c_bug17190_workaround(struct efx_nic *efx)
{
struct qt202x_phy_data *phy_data = efx->phy_data;
@ -133,6 +156,95 @@ static void qt2025c_bug17190_workaround(struct efx_nic *efx)
}
}
static int qt2025c_select_phy_mode(struct efx_nic *efx)
{
struct qt202x_phy_data *phy_data = efx->phy_data;
struct falcon_board *board = falcon_board(efx);
int reg, rc, i;
uint16_t phy_op_mode;
/* Only 2.0.1.0+ PHY firmware supports the more optimal SFP+
* Self-Configure mode. Don't attempt any switching if we encounter
* older firmware. */
if (phy_data->firmware_ver < 0x02000100)
return 0;
/* In general we will get optimal behaviour in "SFP+ Self-Configure"
* mode; however, that powers down most of the PHY when no module is
* present, so we must use a different mode (any fixed mode will do)
* to be sure that loopbacks will work. */
phy_op_mode = (efx->loopback_mode == LOOPBACK_NONE) ? 0x0038 : 0x0020;
/* Only change mode if really necessary */
reg = efx_mdio_read(efx, 1, 0xc319);
if ((reg & 0x0038) == phy_op_mode)
return 0;
EFX_LOG(efx, "Switching PHY to mode 0x%04x\n", phy_op_mode);
/* This sequence replicates the register writes configured in the boot
* EEPROM (including the differences between board revisions), except
* that the operating mode is changed, and the PHY is prevented from
* unnecessarily reloading the main firmware image again. */
efx_mdio_write(efx, 1, 0xc300, 0x0000);
/* (Note: this portion of the boot EEPROM sequence, which bit-bashes 9
* STOPs onto the firmware/module I2C bus to reset it, varies across
* board revisions, as the bus is connected to different GPIO/LED
* outputs on the PHY.) */
if (board->major == 0 && board->minor < 2) {
efx_mdio_write(efx, 1, 0xc303, 0x4498);
for (i = 0; i < 9; i++) {
efx_mdio_write(efx, 1, 0xc303, 0x4488);
efx_mdio_write(efx, 1, 0xc303, 0x4480);
efx_mdio_write(efx, 1, 0xc303, 0x4490);
efx_mdio_write(efx, 1, 0xc303, 0x4498);
}
} else {
efx_mdio_write(efx, 1, 0xc303, 0x0920);
efx_mdio_write(efx, 1, 0xd008, 0x0004);
for (i = 0; i < 9; i++) {
efx_mdio_write(efx, 1, 0xc303, 0x0900);
efx_mdio_write(efx, 1, 0xd008, 0x0005);
efx_mdio_write(efx, 1, 0xc303, 0x0920);
efx_mdio_write(efx, 1, 0xd008, 0x0004);
}
efx_mdio_write(efx, 1, 0xc303, 0x4900);
}
efx_mdio_write(efx, 1, 0xc303, 0x4900);
efx_mdio_write(efx, 1, 0xc302, 0x0004);
efx_mdio_write(efx, 1, 0xc316, 0x0013);
efx_mdio_write(efx, 1, 0xc318, 0x0054);
efx_mdio_write(efx, 1, 0xc319, phy_op_mode);
efx_mdio_write(efx, 1, 0xc31a, 0x0098);
efx_mdio_write(efx, 3, 0x0026, 0x0e00);
efx_mdio_write(efx, 3, 0x0027, 0x0013);
efx_mdio_write(efx, 3, 0x0028, 0xa528);
efx_mdio_write(efx, 1, 0xd006, 0x000a);
efx_mdio_write(efx, 1, 0xd007, 0x0009);
efx_mdio_write(efx, 1, 0xd008, 0x0004);
/* This additional write is not present in the boot EEPROM. It
* prevents the PHY's internal boot ROM doing another pointless (and
* slow) reload of the firmware image (the microcontroller's code
* memory is not affected by the microcontroller reset). */
efx_mdio_write(efx, 1, 0xc317, 0x00ff);
efx_mdio_write(efx, 1, 0xc300, 0x0002);
msleep(20);
/* Restart microcontroller execution from RAM */
efx_mdio_write(efx, 3, 0xe854, 0x00c0);
efx_mdio_write(efx, 3, 0xe854, 0x0040);
msleep(50);
/* Wait for the microcontroller to be ready again */
rc = qt2025c_wait_reset(efx);
if (rc < 0) {
EFX_ERR(efx, "PHY microcontroller reset during mode switch "
"timed out\n");
return rc;
}
return 0;
}
static int qt202x_reset_phy(struct efx_nic *efx)
{
int rc;
@ -206,6 +318,9 @@ static int qt202x_phy_init(struct efx_nic *efx)
devid, efx_mdio_id_oui(devid), efx_mdio_id_model(devid),
efx_mdio_id_rev(devid));
if (efx->phy_type == PHY_TYPE_QT2025C)
qt2025c_firmware_id(efx);
return 0;
}
@ -234,6 +349,10 @@ static int qt202x_phy_reconfigure(struct efx_nic *efx)
struct qt202x_phy_data *phy_data = efx->phy_data;
if (efx->phy_type == PHY_TYPE_QT2025C) {
int rc = qt2025c_select_phy_mode(efx);
if (rc)
return rc;
/* There are several different register bits which can
* disable TX (and save power) on direct-attach cables
* or optical transceivers, varying somewhat between