[U-Boot] [RFC PATCH v1 8/9] sparc: Add MDIO support to GRETH driver

[Francois Retief]

Added MDIO support to the Aeroflex Gaisler GRETH driver. The result is
that we can now use the CONFIG_CMD_MII commands to access the PHY chip.

Signed-off-by: Francois Retief <fgretief at spaceteq.co.za>
---

 drivers/net/greth.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 7784684..5f5abd6 100644
--- a/drivers/net/greth.c
+++ b/drivers/net/greth.c
@@ -18,6 +18,8 @@
 #include <asm/processor.h>
 #include <ambapp.h>
 #include <asm/leon.h>
+#include <miiphy.h>
+#include <errno.h>

 #include "greth.h"

@@ -52,6 +54,7 @@ typedef struct {
        greth_regs *regs;
        int irq;
        struct eth_device *dev;
+       struct mii_dev *bus;

        /* Hardware info */
        unsigned char phyaddr;
@@ -124,6 +127,57 @@ static void write_mii(int phyaddr, int regaddr, int data, volatile greth_regs *

 }

+#ifdef CONFIG_MII
+
+static int greth_mdio_read(struct mii_dev *bus, int port_addr, int dev_addr, int regnum)
+{
+       greth_regs *regs = (greth_regs *)bus->priv;
+
+       debug("GRETH: mdio_read (port_addr=%d, dev_addr=%d, reg=%d)\n", port_addr, dev_addr, regnum);
+
+       return read_mii(port_addr, regnum, regs);
+}
+
+static int greth_mdio_write(struct mii_dev *bus, int port_addr, int dev_addr, int regnum, u16 value)
+{
+       greth_regs *regs = (greth_regs *)bus->priv;
+
+       debug("GRETH: mdio_write (port_addr=%d, dev_addr=%d, reg=%d, value=%d)\n", port_addr, dev_addr, regnum, value);
+
+       write_mii(port_addr, regnum, value, regs);
+       return 0;
+}
+
+static int greth_mdio_reset(struct mii_dev *bus)
+{
+       puts("GRETH: Reset PHY via MDIO reset\n");
+       return 0;
+}
+
+int greth_mdio_register(greth_priv *greth, bd_t *bis)
+{
+       struct mii_dev *bus = mdio_alloc();
+
+       if (!bus) {
+               printf("GRETH: Failed to allocate MDIO bus\n");
+               return -ENOMEM;
+       }
+
+       bus->read = greth_mdio_read;
+       bus->write = greth_mdio_write;
+       bus->reset = greth_mdio_reset;
+       sprintf(bus->name, "GRETH%d", 0);
+
+       bus->priv = (void *)greth->regs;
+       greth->bus = bus;
+
+       return mdio_register(bus);
+}
+
+#else
+static inline int greth_mdio_register(greth_priv *greth, bd_t *bis) { return 0; }
+#endif /* CONFIG_CMD_MII */
+
 /* init/start hardware and allocate descriptor buffers for rx side
  *
  */
@@ -633,6 +687,9 @@ int greth_initialize(bd_t * bis)
                sprintf(dev->name, "GRETH_10/100");
        }

+       /* Register our device with the MDIO subsystem */
+       greth_mdio_register(greth, bis);
+
        /* initiate PHY, select speed/duplex depending on connected PHY */
        if (greth_init_phy(greth, bis)) {
                /* Failed to init PHY (timedout) */
--
1.9.3


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