[U-Boot-Users] [FEC] Fix and optimize MII operations on FEC (MPC8xx) controllers
Guennadi Liakhovetski
lg at denx.de
Thu Nov 29 21:15:56 CET 2007
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 at 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);
}
/*****************************************************************************
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