[RAPIDIO] Add RapidIO connection info print out and re-training for broken connections

Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 935822a25030..dca8eead3967 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -942,6 +942,48 @@ static int fsl_rio_get_cmdline(char *s)
 
 __setup("riohdid=", fsl_rio_get_cmdline);
 
+static inline void fsl_rio_info(struct device *dev, u32 ccsr)
+{
+        const char *str;
+        if (ccsr & 1) {
+                /* Serial phy */
+                switch (ccsr >> 30) {
+                case 0:
+                        str = "1";
+                        break;
+                case 1:
+                        str = "4";
+                        break;
+                default:
+                        str = "Unknown";
+                        break;;
+                }
+                dev_info(dev, "Hardware port width: %s\n", str);
+
+                switch ((ccsr >> 27) & 7) {
+                case 0:
+                        str = "Single-lane 0";
+                        break;
+                case 1:
+                        str = "Single-lane 2";
+                        break;
+                case 2:
+                        str = "Four-lane";
+                        break;
+                default:
+                        str = "Unknown";
+                        break;
+                }
+                dev_info(dev, "Training connection status: %s\n", str);
+        } else {
+                /* Parallel phy */
+                if (!(ccsr & 0x80000000))
+                        dev_info(dev, "Output port operating in 8-bit mode\n");
+                if (!(ccsr & 0x08000000))
+                        dev_info(dev, "Input port operating in 8-bit mode\n");
+        }
+}
+
 /**
  * fsl_rio_setup - Setup MPC85xx RapidIO interface
  * @fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
@@ -1055,6 +1097,35 @@ int fsl_rio_setup(struct of_device *dev)
                         (port->phy_type == RIO_PHY_PARALLEL) ? "parallel" :
                         ((port->phy_type == RIO_PHY_SERIAL) ? "serial" :
                          "unknown"));
+        /* Checking the port training status */
+        if (in_be32((priv->regs_win + RIO_ESCSR)) & 1) {
+                dev_err(&dev->dev, "Port is not ready. "
+                                   "Try to restart connection...\n");
+                switch (port->phy_type) {
+                case RIO_PHY_SERIAL:
+                        /* Disable ports */
+                        out_be32(priv->regs_win + RIO_CCSR, 0);
+                        /* Set 1x lane */
+                        setbits32(priv->regs_win + RIO_CCSR, 0x02000000);
+                        /* Enable ports */
+                        setbits32(priv->regs_win + RIO_CCSR, 0x00600000);
+                        break;
+                case RIO_PHY_PARALLEL:
+                        /* Disable ports */
+                        out_be32(priv->regs_win + RIO_CCSR, 0x22000000);
+                        /* Enable ports */
+                        out_be32(priv->regs_win + RIO_CCSR, 0x44000000);
+                        break;
+                }
+                msleep(100);
+                if (in_be32((priv->regs_win + RIO_ESCSR)) & 1) {
+                        dev_err(&dev->dev, "Port restart failed.\n");
+                        rc = -ENOLINK;
+                        goto err;
+                }
+                dev_info(&dev->dev, "Port restart success!\n");
+        }
+        fsl_rio_info(&dev->dev, ccsr);
 
         port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
                                         & RIO_PEF_CTLS) >> 4;