This patch fixes several issues at least on a MPC885 based system with two FEC interfaces used in MII mode.

1. PHY discovery should first read PHY_PHYIDR2 register and only then PHY_PHYIDR1 like cpu/mpc8xx/fec.c::mii_discover_phy() does it, otherwise the values read are wrong. Also notice, that PHY discovery cannot work on MPC88x / MPC87x in setups with both FECs active at all in its present form, because for both interfaces the registers from FEC 1 are used to communicate over MII.

2. Remove code duplication for resetting the FEC by isolating it into a separate function.

3. Initialize MII on FEC 1 when communicating over FEC 2 in fec_init().

4. Optimize mii_init() to only reset the FEC 1 controller once.

5. Fix a typo in mii_init() using index i instead of j thus potentially leading to unpredictable results.

Signed-off-by: Guennadi Liakhovetski lg@denx.de ---

U-Boot Network and MPC8xx maintainers CCed. Would be good to also test in other setups, particularly with RMII.

Thanks Guennadi

diff --git a/cpu/mpc8xx/fec.c b/cpu/mpc8xx/fec.c index 08a3715..da473ca 100644 --- a/cpu/mpc8xx/fec.c +++ b/cpu/mpc8xx/fec.c @@ -143,6 +143,7 @@ static int fec_send(struct eth_device* dev, volatile void *packet, int length); static int fec_recv(struct eth_device* dev); static int fec_init(struct eth_device* dev, bd_t * bd); static void fec_halt(struct eth_device* dev); +static void __mii_init(void);

int fec_initialize(bd_t *bis) { @@ -539,6 +540,30 @@ static void fec_pin_init(int fecidx) } }

+static int fec_reset(volatile fec_t *fecp) +{ + int i; + + /* Whack a reset. + * A delay is required between a reset of the FEC block and + * initialization of other FEC registers because the reset takes + * some time to complete. If you don't delay, subsequent writes + * to FEC registers might get killed by the reset routine which is + * still in progress. + */ + + fecp->fec_ecntrl = FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET; + for (i = 0; + (fecp->fec_ecntrl & FEC_ECNTRL_RESET) && (i < FEC_RESET_DELAY); + ++i) { + udelay (1); + } + if (i == FEC_RESET_DELAY) + return -1; + + return 0; +} + static int fec_init (struct eth_device *dev, bd_t * bd) { struct ether_fcc_info_s *efis = dev->priv; @@ -573,23 +598,17 @@ static int fec_init (struct eth_device *dev, bd_t * bd) #endif /* CONFIG_FADS */ }

- /* Whack a reset. - * A delay is required between a reset of the FEC block and - * initialization of other FEC registers because the reset takes - * some time to complete. If you don't delay, subsequent writes - * to FEC registers might get killed by the reset routine which is - * still in progress. +#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) + /* the MII interface is connected to FEC1 + * so for the miiphy_xxx function to work we must + * call mii_init since fec_halt messes the thing up */ - fecp->fec_ecntrl = FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET; - for (i = 0; - (fecp->fec_ecntrl & FEC_ECNTRL_RESET) && (i < FEC_RESET_DELAY); - ++i) { - udelay (1); - } - if (i == FEC_RESET_DELAY) { + if (efis->ether_index != 0) + __mii_init(); +#endif + + if (fec_reset(fecp) < 0) printf ("FEC_RESET_DELAY timeout\n"); - return 0; - }

/* We use strictly polling mode only */ @@ -603,7 +622,7 @@ static int fec_init (struct eth_device *dev, bd_t * bd)

/* Set station address */ -#define ea eth_get_dev()->enetaddr +#define ea dev->enetaddr fecp->fec_addr_low = (ea[0] << 24) | (ea[1] << 16) | (ea[2] << 8) | (ea[3]); fecp->fec_addr_high = (ea[4] << 8) | (ea[5]); #undef ea @@ -716,15 +735,8 @@ static int fec_init (struct eth_device *dev, bd_t * bd) } else { efis->actual_phy_addr = efis->phy_addr; } -#if defined(CONFIG_MII) && defined(CONFIG_RMII) - - /* the MII interface is connected to FEC1 - * so for the miiphy_xxx function to work we must - * call mii_init since fec_halt messes the thing up - */ - if (efis->ether_index != 0) - mii_init();

+#if defined(CONFIG_MII) && defined(CONFIG_RMII) /* * adapt the RMII speed to the speed of the phy */ @@ -874,15 +886,14 @@ static int mii_discover_phy(struct eth_device *dev) udelay(10000); /* wait 10ms */ } for (phyno = 0; phyno < 32 && phyaddr < 0; ++phyno) { - phytype = mii_send(mk_mii_read(phyno, PHY_PHYIDR1)); + phytype = mii_send(mk_mii_read(phyno, PHY_PHYIDR2)); #ifdef ET_DEBUG printf("PHY type 0x%x pass %d type ", phytype, pass); #endif if (phytype != 0xffff) { phyaddr = phyno; - phytype <<= 16; phytype |= mii_send(mk_mii_read(phyno, - PHY_PHYIDR2)); + PHY_PHYIDR1)) << 16;

#ifdef ET_DEBUG printf("PHY @ 0x%x pass %d type ",phyno,pass); @@ -929,36 +940,17 @@ static int mii_discover_phy(struct eth_device *dev) #if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) && !defined(CONFIG_BITBANGMII)

/**************************************************************************** - * mii_init -- Initialize the MII for MII command without ethernet + * mii_init -- Initialize the MII via FEC 1 for MII command without ethernet * This function is a subset of eth_init **************************************************************************** */ -void mii_init (void) +static void __mii_init(void) { volatile immap_t *immr = (immap_t *) CFG_IMMR; volatile fec_t *fecp = &(immr->im_cpm.cp_fec); - int i, j;

- for (j = 0; j < sizeof(ether_fcc_info) / sizeof(ether_fcc_info[0]); j++) { - - /* Whack a reset. - * A delay is required between a reset of the FEC block and - * initialization of other FEC registers because the reset takes - * some time to complete. If you don't delay, subsequent writes - * to FEC registers might get killed by the reset routine which is - * still in progress. - */ - - fecp->fec_ecntrl = FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET; - for (i = 0; - (fecp->fec_ecntrl & FEC_ECNTRL_RESET) && (i < FEC_RESET_DELAY); - ++i) { - udelay (1); - } - if (i == FEC_RESET_DELAY) { + if (fec_reset(fecp) < 0) printf ("FEC_RESET_DELAY timeout\n"); - return; - }

/* We use strictly polling mode only */ @@ -968,14 +960,21 @@ void mii_init (void) */ fecp->fec_ievent = 0xffc0;

- /* Setup the pin configuration of the FEC(s) - */ - fec_pin_init(ether_fcc_info[i].ether_index); - /* Now enable the transmit and receive processing */ fecp->fec_ecntrl = FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN; - } +} + +void mii_init (void) +{ + int i; + + __mii_init(); + + /* Setup the pin configuration of the FEC(s) + */ + for (i = 0; i < sizeof(ether_fcc_info) / sizeof(ether_fcc_info[0]); i++) + fec_pin_init(ether_fcc_info[i].ether_index); }

/*****************************************************************************