From aa6c91fe5913faa2cd2a62de993a3130799412b1 Mon Sep 17 00:00:00 2001 From: Matt Carlson Date: Mon, 12 Nov 2007 21:18:04 -0800 Subject: [TG3]: Prescaler fix Internal hardware timers become inaccurate after link events. Clock frequency switches performed by the CPMU fail to adjust timer prescalers. The fix is to detect core clock frequency changes during link events and adjust the timer prescalers accordingly. Signed-off-by: Matt Carlson Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/tg3.c | 16 ++++++++++++++++ drivers/net/tg3.h | 9 ++++++++- 2 files changed, 24 insertions(+), 1 deletion(-) (limited to 'drivers/net') diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index bb3b7343517..ecd64a224e9 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -3154,6 +3154,22 @@ static int tg3_setup_phy(struct tg3 *tp, int force_reset) err = tg3_setup_copper_phy(tp, force_reset); } + if (tp->pci_chip_rev_id == CHIPREV_ID_5784_A0) { + u32 val, scale; + + val = tr32(TG3_CPMU_CLCK_STAT) & CPMU_CLCK_STAT_MAC_CLCK_MASK; + if (val == CPMU_CLCK_STAT_MAC_CLCK_62_5) + scale = 65; + else if (val == CPMU_CLCK_STAT_MAC_CLCK_6_25) + scale = 6; + else + scale = 12; + + val = tr32(GRC_MISC_CFG) & ~GRC_MISC_CFG_PRESCALAR_MASK; + val |= (scale << GRC_MISC_CFG_PRESCALAR_SHIFT); + tw32(GRC_MISC_CFG, val); + } + if (tp->link_config.active_speed == SPEED_1000 && tp->link_config.active_duplex == DUPLEX_HALF) tw32(MAC_TX_LENGTHS, diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h index 5b799ff2c4d..d325ab59b39 100644 --- a/drivers/net/tg3.h +++ b/drivers/net/tg3.h @@ -874,7 +874,14 @@ #define TG3_CPMU_HST_ACC 0x0000361c #define CPMU_HST_ACC_MACCLK_MASK 0x001f0000 #define CPMU_HST_ACC_MACCLK_6_25 0x00130000 -/* 0x3620 --> 0x365c unused */ +/* 0x3620 --> 0x3630 unused */ + +#define TG3_CPMU_CLCK_STAT 0x00003630 +#define CPMU_CLCK_STAT_MAC_CLCK_MASK 0x001f0000 +#define CPMU_CLCK_STAT_MAC_CLCK_62_5 0x00000000 +#define CPMU_CLCK_STAT_MAC_CLCK_12_5 0x00110000 +#define CPMU_CLCK_STAT_MAC_CLCK_6_25 0x00130000 +/* 0x3634 --> 0x365c unused */ #define TG3_CPMU_MUTEX_REQ 0x0000365c #define CPMU_MUTEX_REQ_DRIVER 0x00001000 -- cgit v1.2.3