GRETH: Added autodetection of PHY address, or let BSP hardcode it.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>

diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 788aac81c226a372d74b877479668c045dc944c8..cb68d45e0275f24cc49b076594a293d1e1f4a356 100644 (file)
--- 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(&regs->mdio) & GRETH_MII_BUSY) {
        }
 
-       GRETH_REGSAVE(&regs->mdio, (0 << 11) | ((addr & 0x1F) << 6) | 2);
+       GRETH_REGSAVE(&regs->mdio, ((phyaddr & 0x1F) << 11) | ((regaddr & 0x1F) << 6) | 2);
 
        while (GRETH_REGLOAD(&regs->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(&regs->mdio) & GRETH_MII_BUSY) {
        }
 
        GRETH_REGSAVE(&regs->mdio,
-                     ((data & 0xFFFF) << 16) | (0 << 11) | ((addr & 0x1F) << 6)
-                     | 1);
+                     ((data & 0xFFFF) << 16) | ((phyaddr & 0x1F) << 11) |
+                     ((regaddr & 0x1F) << 6) | 1);
 
        while (GRETH_REGLOAD(&regs->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(&regs->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;
 }