[U-Boot] [PATCH 3/6] GRETH: Added autodetection of PHY address, or let BSP hardcode it.
Daniel Hellstrom
daniel at gaisler.com
Wed Oct 27 10:23:34 CEST 2010
Signed-off-by: Daniel Hellstrom <daniel at gaisler.com>
---
drivers/net/greth.c | 78 ++++++++++++++++++++++++++++++++++++---------------
1 files changed, 55 insertions(+), 23 deletions(-)
diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 788aac8..cb68d45 100644
--- a/drivers/net/greth.c
+++ b/drivers/net/greth.c
@@ -42,6 +42,13 @@
#define GRETH_PHY_TIMEOUT_MS 3000
#endif
+/* Default to PHY adrress 0 not not specified */
+#ifdef CONFIG_SYS_GRLIB_GRETH_PHYADDR
+#define GRETH_PHY_ADR_DEFAULT CONFIG_SYS_GRLIB_GRETH_PHYADDR
+#else
+#define GRETH_PHY_ADR_DEFAULT 0
+#endif
+
/* ByPass Cache when reading regs */
#define GRETH_REGLOAD(addr) SPARC_NOCACHE_READ(addr)
/* Write-through cache ==> no bypassing needed on writes */
@@ -102,12 +109,12 @@ typedef struct {
} greth_priv;
/* Read MII register 'addr' from core 'regs' */
-static int read_mii(int addr, volatile greth_regs * regs)
+static int read_mii(int phyaddr, int regaddr, volatile greth_regs * regs)
{
while (GRETH_REGLOAD(®s->mdio) & GRETH_MII_BUSY) {
}
- GRETH_REGSAVE(®s->mdio, (0 << 11) | ((addr & 0x1F) << 6) | 2);
+ GRETH_REGSAVE(®s->mdio, ((phyaddr & 0x1F) << 11) | ((regaddr & 0x1F) << 6) | 2);
while (GRETH_REGLOAD(®s->mdio) & GRETH_MII_BUSY) {
}
@@ -119,14 +126,14 @@ static int read_mii(int addr, volatile greth_regs * regs)
}
}
-static void write_mii(int addr, int data, volatile greth_regs * regs)
+static void write_mii(int phyaddr, int regaddr, int data, volatile greth_regs * regs)
{
while (GRETH_REGLOAD(®s->mdio) & GRETH_MII_BUSY) {
}
GRETH_REGSAVE(®s->mdio,
- ((data & 0xFFFF) << 16) | (0 << 11) | ((addr & 0x1F) << 6)
- | 1);
+ ((data & 0xFFFF) << 16) | ((phyaddr & 0x1F) << 11) |
+ ((regaddr & 0x1F) << 6) | 1);
while (GRETH_REGLOAD(®s->mdio) & GRETH_MII_BUSY) {
}
@@ -214,6 +221,26 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
greth_regs *regs = dev->regs;
int tmp, tmp1, tmp2, i;
unsigned int start, timeout;
+ int phyaddr = GRETH_PHY_ADR_DEFAULT;
+
+#ifndef CONFIG_SYS_GRLIB_GRETH_PHYADDR
+ /* If BSP doesn't provide a hardcoded PHY address the driver will
+ * try to autodetect PHY address by stopping the search on the first
+ * PHY address which has REG0 implemented.
+ */
+ for (i=0; i<32; i++) {
+ tmp = read_mii(i, 0, regs);
+ if ( (tmp != 0) && (tmp != 0xffff) ) {
+ phyaddr = i;
+ break;
+ }
+ }
+#endif
+
+ /* Save PHY Address */
+ dev->phyaddr = phyaddr;
+
+ debug("GRETH PHY ADDRESS: %d\n", phyaddr);
/* X msecs to ticks */
timeout = usec2ticks(GRETH_PHY_TIMEOUT_MS * 1000);
@@ -225,17 +252,21 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
/* get phy control register default values */
- while ((tmp = read_mii(0, regs)) & 0x8000) {
- if (get_timer(start) > timeout)
+ while ((tmp = read_mii(phyaddr, 0, regs)) & 0x8000) {
+ if (get_timer(start) > timeout) {
+ debug("greth_init_phy: PHY read 1 failed\n");
return 1; /* Fail */
+ }
}
/* reset PHY and wait for completion */
- write_mii(0, 0x8000 | tmp, regs);
+ write_mii(phyaddr, 0, 0x8000 | tmp, regs);
- while (((tmp = read_mii(0, regs))) & 0x8000) {
- if (get_timer(start) > timeout)
+ while (((tmp = read_mii(phyaddr, 0, regs))) & 0x8000) {
+ if (get_timer(start) > timeout) {
+ debug("greth_init_phy: PHY read 2 failed\n");
return 1; /* Fail */
+ }
}
/* Check if PHY is autoneg capable and then determine operating
@@ -246,16 +277,16 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
dev->sp = 0;
dev->auto_neg = 0;
if (!((tmp >> 12) & 1)) {
- write_mii(0, 0, regs);
+ write_mii(phyaddr, 0, 0, regs);
} else {
/* wait for auto negotiation to complete and then check operating mode */
dev->auto_neg = 1;
i = 0;
- while (!(((tmp = read_mii(1, regs)) >> 5) & 1)) {
+ while (!(((tmp = read_mii(phyaddr, 1, regs)) >> 5) & 1)) {
if (get_timer(start) > timeout) {
printf("Auto negotiation timed out. "
"Selecting default config\n");
- tmp = read_mii(0, regs);
+ tmp = read_mii(phyaddr, 0, regs);
dev->gb = ((tmp >> 6) & 1)
&& !((tmp >> 13) & 1);
dev->sp = !((tmp >> 6) & 1)
@@ -265,8 +296,8 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
}
}
if ((tmp >> 8) & 1) {
- tmp1 = read_mii(9, regs);
- tmp2 = read_mii(10, regs);
+ tmp1 = read_mii(phyaddr, 9, regs);
+ tmp2 = read_mii(phyaddr, 10, regs);
if ((tmp1 & GRETH_MII_EXTADV_1000FD) &&
(tmp2 & GRETH_MII_EXTPRT_1000FD)) {
dev->gb = 1;
@@ -279,8 +310,8 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
}
}
if ((dev->gb == 0) || ((dev->gb == 1) && (dev->gbit_mac == 0))) {
- tmp1 = read_mii(4, regs);
- tmp2 = read_mii(5, regs);
+ tmp1 = read_mii(phyaddr, 4, regs);
+ tmp2 = read_mii(phyaddr, 5, regs);
if ((tmp1 & GRETH_MII_100TXFD) &&
(tmp2 & GRETH_MII_100TXFD)) {
dev->sp = 1;
@@ -297,7 +328,7 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
if ((dev->gb == 1) && (dev->gbit_mac == 0)) {
dev->gb = 0;
dev->fd = 0;
- write_mii(0, dev->sp << 13, regs);
+ write_mii(phyaddr, 0, dev->sp << 13, regs);
}
}
@@ -307,8 +338,8 @@ int greth_init_phy(greth_priv * dev, bd_t * bis)
%d Mbps %s duplex\n", dev->gbit_mac ? "10/100/1000" : "10/100", (unsigned int)(regs), (unsigned int)(dev->irq), dev->gb ? 1000 : (dev->sp ? 100 : 10), dev->fd ? "full" : "half");
/* Read out PHY info if extended registers are available */
if (tmp & 1) {
- tmp1 = read_mii(2, regs);
- tmp2 = read_mii(3, regs);
+ tmp1 = read_mii(phyaddr, 2, regs);
+ tmp2 = read_mii(phyaddr, 3, regs);
tmp1 = (tmp1 << 6) | ((tmp2 >> 10) & 0x3F);
tmp = tmp2 & 0xF;
@@ -492,8 +523,7 @@ int greth_recv(struct eth_device *dev)
for (i = 0; i < GRETH_RXBD_CNT; i++) {
printf("[%d]: Stat=0x%lx, Addr=0x%lx\n", i,
GRETH_REGLOAD(&greth->rxbd_base[i].stat),
- GRETH_REGLOAD(&greth->rxbd_base[i].
- addr));
+ GRETH_REGLOAD(&greth->rxbd_base[i].addr));
}
} else {
/* Process the incoming packet. */
@@ -530,7 +560,7 @@ int greth_recv(struct eth_device *dev)
(unsigned int)greth->rxbd_max) ? greth->
rxbd_base : (greth->rxbd_curr + 1);
- };
+ }
if (enable) {
GRETH_REGORIN(®s->control, GRETH_RXEN);
@@ -612,6 +642,7 @@ int greth_initialize(bd_t * bis)
/* initiate PHY, select speed/duplex depending on connected PHY */
if (greth_init_phy(greth, bis)) {
/* Failed to init PHY (timedout) */
+ debug("GRETH[0x%08x]: Failed to init PHY\n", greth->regs);
return -1;
}
@@ -640,5 +671,6 @@ int greth_initialize(bd_t * bis)
/* set and remember MAC address */
greth_set_hwaddr(greth, addr);
+ debug("GRETH[0x%08x]: Initialized successfully\n", greth->regs);
return 0;
}
--
1.5.4
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