From: Michael Chan Date: Tue, 20 Dec 2005 00:27:04 +0000 (-0800) Subject: [TG3]: Add tw32_wait_f() for some sensitive registers X-Git-Tag: v2.6.15-rc7~16^2~16^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b401e9e2ec44a5fc1d8053546276bff584b7118e;p=linux-2.6 [TG3]: Add tw32_wait_f() for some sensitive registers The tw32_f() function (register write with immediate read flush) can hang when used on some registers to switch clock frequencies and power. A new tw32_wait_f() is added for such registers with the delay before the read and after the read. Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index de898f175d..b0d963c837 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -341,6 +341,16 @@ static struct { { "interrupt test (offline)" }, }; +static void tg3_write32(struct tg3 *tp, u32 off, u32 val) +{ + writel(val, tp->regs + off); +} + +static u32 tg3_read32(struct tg3 *tp, u32 off) +{ + return (readl(tp->regs + off)); +} + static void tg3_write_indirect_reg32(struct tg3 *tp, u32 off, u32 val) { unsigned long flags; @@ -411,13 +421,29 @@ static u32 tg3_read_indirect_mbox(struct tg3 *tp, u32 off) return val; } -static void _tw32_flush(struct tg3 *tp, u32 off, u32 val) +/* usec_wait specifies the wait time in usec when writing to certain registers + * where it is unsafe to read back the register without some delay. + * GRC_LOCAL_CTRL is one example if the GPIOs are toggled to switch power. + * TG3PCI_CLOCK_CTRL is another example if the clock frequencies are changed. + */ +static void _tw32_flush(struct tg3 *tp, u32 off, u32 val, u32 usec_wait) { - tp->write32(tp, off, val); - if (!(tp->tg3_flags & TG3_FLAG_PCIX_TARGET_HWBUG) && - !(tp->tg3_flags & TG3_FLAG_5701_REG_WRITE_BUG) && - !(tp->tg3_flags2 & TG3_FLG2_ICH_WORKAROUND)) - tp->read32(tp, off); /* flush */ + if ((tp->tg3_flags & TG3_FLAG_PCIX_TARGET_HWBUG) || + (tp->tg3_flags2 & TG3_FLG2_ICH_WORKAROUND)) + /* Non-posted methods */ + tp->write32(tp, off, val); + else { + /* Posted method */ + tg3_write32(tp, off, val); + if (usec_wait) + udelay(usec_wait); + tp->read32(tp, off); + } + /* Wait again after the read for the posted method to guarantee that + * the wait time is met. + */ + if (usec_wait) + udelay(usec_wait); } static inline void tw32_mailbox_flush(struct tg3 *tp, u32 off, u32 val) @@ -438,16 +464,6 @@ static void tg3_write32_tx_mbox(struct tg3 *tp, u32 off, u32 val) readl(mbox); } -static void tg3_write32(struct tg3 *tp, u32 off, u32 val) -{ - writel(val, tp->regs + off); -} - -static u32 tg3_read32(struct tg3 *tp, u32 off) -{ - return (readl(tp->regs + off)); -} - #define tw32_mailbox(reg, val) tp->write32_mbox(tp, reg, val) #define tw32_mailbox_f(reg, val) tw32_mailbox_flush(tp, (reg), (val)) #define tw32_rx_mbox(reg, val) tp->write32_rx_mbox(tp, reg, val) @@ -455,7 +471,8 @@ static u32 tg3_read32(struct tg3 *tp, u32 off) #define tr32_mailbox(reg) tp->read32_mbox(tp, reg) #define tw32(reg,val) tp->write32(tp, reg, val) -#define tw32_f(reg,val) _tw32_flush(tp,(reg),(val)) +#define tw32_f(reg,val) _tw32_flush(tp,(reg),(val), 0) +#define tw32_wait_f(reg,val,us) _tw32_flush(tp,(reg),(val), (us)) #define tr32(reg) tp->read32(tp, reg) static void tg3_write_mem(struct tg3 *tp, u32 off, u32 val) @@ -595,21 +612,19 @@ static void tg3_switch_clocks(struct tg3 *tp) if (tp->tg3_flags2 & TG3_FLG2_5705_PLUS) { if (orig_clock_ctrl & CLOCK_CTRL_625_CORE) { - tw32_f(TG3PCI_CLOCK_CTRL, - clock_ctrl | CLOCK_CTRL_625_CORE); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, + clock_ctrl | CLOCK_CTRL_625_CORE, 40); } } else if ((orig_clock_ctrl & CLOCK_CTRL_44MHZ_CORE) != 0) { - tw32_f(TG3PCI_CLOCK_CTRL, - clock_ctrl | - (CLOCK_CTRL_44MHZ_CORE | CLOCK_CTRL_ALTCLK)); - udelay(40); - tw32_f(TG3PCI_CLOCK_CTRL, - clock_ctrl | (CLOCK_CTRL_ALTCLK)); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, + clock_ctrl | + (CLOCK_CTRL_44MHZ_CORE | CLOCK_CTRL_ALTCLK), + 40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, + clock_ctrl | (CLOCK_CTRL_ALTCLK), + 40); } - tw32_f(TG3PCI_CLOCK_CTRL, clock_ctrl); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, clock_ctrl, 40); } #define PHY_BUSY_LOOPS 5000 @@ -1033,13 +1048,13 @@ static void tg3_frob_aux_power(struct tg3 *tp) (tp_peer->tg3_flags & TG3_FLAG_ENABLE_ASF) != 0) { if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5700 || GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5701) { - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - (GRC_LCLCTRL_GPIO_OE0 | - GRC_LCLCTRL_GPIO_OE1 | - GRC_LCLCTRL_GPIO_OE2 | - GRC_LCLCTRL_GPIO_OUTPUT0 | - GRC_LCLCTRL_GPIO_OUTPUT1)); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + (GRC_LCLCTRL_GPIO_OE0 | + GRC_LCLCTRL_GPIO_OE1 | + GRC_LCLCTRL_GPIO_OE2 | + GRC_LCLCTRL_GPIO_OUTPUT0 | + GRC_LCLCTRL_GPIO_OUTPUT1), + 100); } else { u32 no_gpio2; u32 grc_local_ctrl = 0; @@ -1052,9 +1067,8 @@ static void tg3_frob_aux_power(struct tg3 *tp) if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5714) { grc_local_ctrl |= GRC_LCLCTRL_GPIO_OE3; - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - grc_local_ctrl); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + grc_local_ctrl, 100); } /* On 5753 and variants, GPIO2 cannot be used. */ @@ -1070,21 +1084,18 @@ static void tg3_frob_aux_power(struct tg3 *tp) grc_local_ctrl &= ~(GRC_LCLCTRL_GPIO_OE2 | GRC_LCLCTRL_GPIO_OUTPUT2); } - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - grc_local_ctrl); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + grc_local_ctrl, 100); grc_local_ctrl |= GRC_LCLCTRL_GPIO_OUTPUT0; - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - grc_local_ctrl); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + grc_local_ctrl, 100); if (!no_gpio2) { grc_local_ctrl &= ~GRC_LCLCTRL_GPIO_OUTPUT2; - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - grc_local_ctrl); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + grc_local_ctrl, 100); } } } else { @@ -1094,19 +1105,16 @@ static void tg3_frob_aux_power(struct tg3 *tp) (tp_peer->tg3_flags & TG3_FLAG_INIT_COMPLETE) != 0) return; - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - (GRC_LCLCTRL_GPIO_OE1 | - GRC_LCLCTRL_GPIO_OUTPUT1)); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + (GRC_LCLCTRL_GPIO_OE1 | + GRC_LCLCTRL_GPIO_OUTPUT1), 100); - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - (GRC_LCLCTRL_GPIO_OE1)); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + GRC_LCLCTRL_GPIO_OE1, 100); - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | - (GRC_LCLCTRL_GPIO_OE1 | - GRC_LCLCTRL_GPIO_OUTPUT1)); - udelay(100); + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl | + (GRC_LCLCTRL_GPIO_OE1 | + GRC_LCLCTRL_GPIO_OUTPUT1), 100); } } } @@ -1149,10 +1157,8 @@ static int tg3_set_power_state(struct tg3 *tp, int state) udelay(100); /* Delay after power state change */ /* Switch out of Vaux if it is not a LOM */ - if (!(tp->tg3_flags & TG3_FLAG_EEPROM_WRITE_PROT)) { - tw32_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl); - udelay(100); - } + if (!(tp->tg3_flags & TG3_FLAG_EEPROM_WRITE_PROT)) + tw32_wait_f(GRC_LOCAL_CTRL, tp->grc_local_ctrl, 100); return 0; @@ -1251,10 +1257,8 @@ static int tg3_set_power_state(struct tg3 *tp, int state) base_val |= (CLOCK_CTRL_RXCLK_DISABLE | CLOCK_CTRL_TXCLK_DISABLE); - tw32_f(TG3PCI_CLOCK_CTRL, base_val | - CLOCK_CTRL_ALTCLK | - CLOCK_CTRL_PWRDOWN_PLL133); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, base_val | CLOCK_CTRL_ALTCLK | + CLOCK_CTRL_PWRDOWN_PLL133, 40); } else if (tp->tg3_flags2 & TG3_FLG2_5780_CLASS) { /* do nothing */ } else if (!((tp->tg3_flags2 & TG3_FLG2_5750_PLUS) && @@ -1275,11 +1279,11 @@ static int tg3_set_power_state(struct tg3 *tp, int state) newbits2 = newbits1 | CLOCK_CTRL_44MHZ_CORE; } - tw32_f(TG3PCI_CLOCK_CTRL, tp->pci_clock_ctrl | newbits1); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, tp->pci_clock_ctrl | newbits1, + 40); - tw32_f(TG3PCI_CLOCK_CTRL, tp->pci_clock_ctrl | newbits2); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, tp->pci_clock_ctrl | newbits2, + 40); if (!(tp->tg3_flags2 & TG3_FLG2_5705_PLUS)) { u32 newbits3; @@ -1293,9 +1297,8 @@ static int tg3_set_power_state(struct tg3 *tp, int state) newbits3 = CLOCK_CTRL_44MHZ_CORE; } - tw32_f(TG3PCI_CLOCK_CTRL, - tp->pci_clock_ctrl | newbits3); - udelay(40); + tw32_wait_f(TG3PCI_CLOCK_CTRL, + tp->pci_clock_ctrl | newbits3, 40); } }