ibm_newemac: Fix EMAC soft reset on 460EX/GT

This patch fixes EMAC soft reset on 460EX/GT when no external clock is
available.

Signed-off-by: Victor Gallardo <vgallardo@amcc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 27 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/dcr-regs.h b/arch/powerpc/include/asm/dcr-regs.h
index 29b0ecef980a..f15296cf3598 100644
--- a/arch/powerpc/include/asm/dcr-regs.h
+++ b/arch/powerpc/include/asm/dcr-regs.h
@@ -68,6 +68,10 @@
 #define SDR0_UART3              0x0123
 #define SDR0_CUST0              0x4000
 
+/* SDRs (460EX/460GT) */
+#define SDR0_ETH_CFG            0x4103
+#define SDR0_ETH_CFG_ECS        0x00000100      /* EMAC int clk source */
+
 /*
  * All those DCR register addresses are offsets from the base address
  * for the SRAM0 controller (e.g. 0x20 on 440GX). The base address is
diff --git a/drivers/net/ibm_newemac/core.c b/drivers/net/ibm_newemac/core.c
index ccd9d9058f6d..58dfd32ccca8 100644
--- a/drivers/net/ibm_newemac/core.c
+++ b/drivers/net/ibm_newemac/core.c
@@ -130,6 +130,7 @@ static inline void emac_report_timeout_error(struct emac_instance *dev,
                                              const char *error)
 {
         if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
+                                  EMAC_FTR_460EX_PHY_CLK_FIX |
                                   EMAC_FTR_440EP_PHY_CLK_FIX))
                 DBG(dev, "%s" NL, error);
         else if (net_ratelimit())
@@ -351,10 +352,24 @@ static int emac_reset(struct emac_instance *dev)
                 emac_tx_disable(dev);
         }
 
+#ifdef CONFIG_PPC_DCR_NATIVE
+        /* Enable internal clock source */
+        if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
+                dcri_clrset(SDR0, SDR0_ETH_CFG,
+                            0, SDR0_ETH_CFG_ECS << dev->cell_index);
+#endif
+
         out_be32(&p->mr0, EMAC_MR0_SRST);
         while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
                 --n;
 
+#ifdef CONFIG_PPC_DCR_NATIVE
+         /* Enable external clock source */
+        if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
+                dcri_clrset(SDR0, SDR0_ETH_CFG,
+                            SDR0_ETH_CFG_ECS << dev->cell_index, 0);
+#endif
+
         if (n) {
                 dev->reset_failed = 0;
                 return 0;
@@ -2559,6 +2574,9 @@ static int __devinit emac_init_config(struct emac_instance *dev)
         /* Check EMAC version */
         if (of_device_is_compatible(np, "ibm,emac4sync")) {
                 dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
+                if (of_device_is_compatible(np, "ibm,emac-460ex") ||
+                    of_device_is_compatible(np, "ibm,emac-460gt"))
+                        dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
         } else if (of_device_is_compatible(np, "ibm,emac4")) {
                 dev->features |= EMAC_FTR_EMAC4;
                 if (of_device_is_compatible(np, "ibm,emac-440gx"))
diff --git a/drivers/net/ibm_newemac/core.h b/drivers/net/ibm_newemac/core.h
index 6545e69d12c3..5ca70e55b6c5 100644
--- a/drivers/net/ibm_newemac/core.h
+++ b/drivers/net/ibm_newemac/core.h
@@ -317,6 +317,10 @@ struct emac_instance {
  * The 405EX and 460EX contain the EMAC4SYNC core
  */
 #define EMAC_FTR_EMAC4SYNC              0x00000200
+/*
+ * Set if we need phy clock workaround for 460ex or 460gt
+ */
+#define EMAC_FTR_460EX_PHY_CLK_FIX      0x00000400
 
 
 /* Right now, we don't quite handle the always/possible masks on the
@@ -341,6 +345,7 @@ enum {
 #ifdef CONFIG_IBM_NEW_EMAC_RGMII
             EMAC_FTR_HAS_RGMII  |
 #endif
+        EMAC_FTR_460EX_PHY_CLK_FIX |
         EMAC_FTR_440EP_PHY_CLK_FIX,
 };