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tg3: Use constant 500KHz MI clock on adapters with a CPMU

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The MI clock is not configured correctly on adapters with the CPMU
present.  The tg3 driver has code which statically sets the MI clock to
be a fraction of the speed at which the core clock is running.
However, the CPMU can change the adapter's core clock frequency based
on operating conditions.  Consequently, the MI will run slow when the
core's clock has been slowed down.

There is a new 500KHz constant frequency clock available on adapters
with a CPMU.  This patch removes the static core clock scaling and
configures the MI clock to use this new 500KHz clock instead.

Running the MI clock at slower speeds will not directly result in data
corruption, but it does challenge the PHY read and write routine timeouts.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Carlson 2008-05-02 16:47:53 -07:00 committed by David S. Miller
parent 026672d099
commit 8ef2142886
2 changed files with 14 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/net/tg3.c
View File

@ -2097,9 +2097,11 @@ static int tg3_setup_copper_phy(struct tg3 *tp, int force_reset)
MAC_STATUS_LNKSTATE_CHANGED));
udelay(40);
tp->mi_mode = MAC_MI_MODE_BASE;
tw32_f(MAC_MI_MODE, tp->mi_mode);
udelay(80);
if ((tp->mi_mode & MAC_MI_MODE_AUTO_POLL) != 0) {
tw32_f(MAC_MI_MODE,
(tp->mi_mode & ~MAC_MI_MODE_AUTO_POLL));
udelay(80);
}
tg3_writephy(tp, MII_TG3_AUX_CTRL, 0x02);
@ -7102,7 +7104,7 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
tp->link_config.autoneg = tp->link_config.orig_autoneg;
}
tp->mi_mode = MAC_MI_MODE_BASE;
tp->mi_mode &= ~MAC_MI_MODE_AUTO_POLL;
tw32_f(MAC_MI_MODE, tp->mi_mode);
udelay(80);
@ -11764,6 +11766,12 @@ static int __devinit tg3_get_invariants(struct tg3 *tp)
tp->phy_otp = TG3_OTP_DEFAULT;
}
if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5784 ||
GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5761)
tp->mi_mode = MAC_MI_MODE_500KHZ_CONST;
else
tp->mi_mode = MAC_MI_MODE_BASE;
tp->coalesce_mode = 0;
if (GET_CHIP_REV(tp->pci_chip_rev_id) != CHIPREV_5700_AX &&
GET_CHIP_REV(tp->pci_chip_rev_id) != CHIPREV_5700_BX)
@ -12692,7 +12700,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
tp->mac_mode = TG3_DEF_MAC_MODE;
tp->rx_mode = TG3_DEF_RX_MODE;
tp->tx_mode = TG3_DEF_TX_MODE;
tp->mi_mode = MAC_MI_MODE_BASE;
if (tg3_debug > 0)
tp->msg_enable = tg3_debug;
else

2
drivers/net/tg3.h
View File

@ -415,7 +415,7 @@
#define MAC_MI_MODE_CLK_10MHZ 0x00000001
#define MAC_MI_MODE_SHORT_PREAMBLE 0x00000002
#define MAC_MI_MODE_AUTO_POLL 0x00000010
#define MAC_MI_MODE_CORE_CLK_62MHZ 0x00008000
#define MAC_MI_MODE_500KHZ_CONST 0x00008000
#define MAC_MI_MODE_BASE 0x000c0000 /* XXX magic values XXX */
#define MAC_AUTO_POLL_STATUS 0x00000458
#define MAC_AUTO_POLL_ERROR 0x00000001