[PATCH] 8139cp: add ethtool eeprom support

Implement the ethtool eeprom operations for the 8139cp driver.
Tested on x86 and big-endian ARM.

Signed-off-by: Philip Craig <philipc@snapgear.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 167 insertions, 12 deletions

diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index b49be8f2c107..a26077a175ad 100644
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -401,6 +401,11 @@ static void cp_clean_rings (struct cp_private *cp);
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void cp_poll_controller(struct net_device *dev);
 #endif
+static int cp_get_eeprom_len(struct net_device *dev);
+static int cp_get_eeprom(struct net_device *dev,
+                         struct ethtool_eeprom *eeprom, u8 *data);
+static int cp_set_eeprom(struct net_device *dev,
+                         struct ethtool_eeprom *eeprom, u8 *data);
 
 static struct pci_device_id cp_pci_tbl[] = {
         { PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139,
@@ -1577,6 +1582,9 @@ static struct ethtool_ops cp_ethtool_ops = {
         .get_strings            = cp_get_strings,
         .get_ethtool_stats      = cp_get_ethtool_stats,
         .get_perm_addr          = ethtool_op_get_perm_addr,
+        .get_eeprom_len         = cp_get_eeprom_len,
+        .get_eeprom             = cp_get_eeprom,
+        .set_eeprom             = cp_set_eeprom,
 };
 
 static int cp_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
@@ -1612,24 +1620,32 @@ static int cp_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
 #define eeprom_delay()  readl(ee_addr)
 
 /* The EEPROM commands include the alway-set leading bit. */
+#define EE_EXTEND_CMD   (4)
 #define EE_WRITE_CMD    (5)
 #define EE_READ_CMD             (6)
 #define EE_ERASE_CMD    (7)
 
-static int read_eeprom (void __iomem *ioaddr, int location, int addr_len)
-{
-        int i;
-        unsigned retval = 0;
-        void __iomem *ee_addr = ioaddr + Cfg9346;
-        int read_cmd = location | (EE_READ_CMD << addr_len);
+#define EE_EWDS_ADDR    (0)
+#define EE_WRAL_ADDR    (1)
+#define EE_ERAL_ADDR    (2)
+#define EE_EWEN_ADDR    (3)
+
+#define CP_EEPROM_MAGIC PCI_DEVICE_ID_REALTEK_8139
 
+static void eeprom_cmd_start(void __iomem *ee_addr)
+{
         writeb (EE_ENB & ~EE_CS, ee_addr);
         writeb (EE_ENB, ee_addr);
         eeprom_delay ();
+}
 
-        /* Shift the read command bits out. */
-        for (i = 3 + addr_len - 1; i >= 0; i--) {
-                int dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
+static void eeprom_cmd(void __iomem *ee_addr, int cmd, int cmd_len)
+{
+        int i;
+
+        /* Shift the command bits out. */
+        for (i = cmd_len - 1; i >= 0; i--) {
+                int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0;
                 writeb (EE_ENB | dataval, ee_addr);
                 eeprom_delay ();
                 writeb (EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
@@ -1637,6 +1653,33 @@ static int read_eeprom (void __iomem *ioaddr, int location, int addr_len)
         }
         writeb (EE_ENB, ee_addr);
         eeprom_delay ();
+}
+
+static void eeprom_cmd_end(void __iomem *ee_addr)
+{
+        writeb (~EE_CS, ee_addr);
+        eeprom_delay ();
+}
+
+static void eeprom_extend_cmd(void __iomem *ee_addr, int extend_cmd,
+                              int addr_len)
+{
+        int cmd = (EE_EXTEND_CMD << addr_len) | (extend_cmd << (addr_len - 2));
+
+        eeprom_cmd_start(ee_addr);
+        eeprom_cmd(ee_addr, cmd, 3 + addr_len);
+        eeprom_cmd_end(ee_addr);
+}
+
+static u16 read_eeprom (void __iomem *ioaddr, int location, int addr_len)
+{
+        int i;
+        u16 retval = 0;
+        void __iomem *ee_addr = ioaddr + Cfg9346;
+        int read_cmd = location | (EE_READ_CMD << addr_len);
+
+        eeprom_cmd_start(ee_addr);
+        eeprom_cmd(ee_addr, read_cmd, 3 + addr_len);
 
         for (i = 16; i > 0; i--) {
                 writeb (EE_ENB | EE_SHIFT_CLK, ee_addr);
@@ -1648,13 +1691,125 @@ static int read_eeprom (void __iomem *ioaddr, int location, int addr_len)
                 eeprom_delay ();
         }
 
-        /* Terminate the EEPROM access. */
-        writeb (~EE_CS, ee_addr);
-        eeprom_delay ();
+        eeprom_cmd_end(ee_addr);
 
         return retval;
 }
 
+static void write_eeprom(void __iomem *ioaddr, int location, u16 val,
+                         int addr_len)
+{
+        int i;
+        void __iomem *ee_addr = ioaddr + Cfg9346;
+        int write_cmd = location | (EE_WRITE_CMD << addr_len);
+
+        eeprom_extend_cmd(ee_addr, EE_EWEN_ADDR, addr_len);
+
+        eeprom_cmd_start(ee_addr);
+        eeprom_cmd(ee_addr, write_cmd, 3 + addr_len);
+        eeprom_cmd(ee_addr, val, 16);
+        eeprom_cmd_end(ee_addr);
+
+        eeprom_cmd_start(ee_addr);
+        for (i = 0; i < 20000; i++)
+                if (readb(ee_addr) & EE_DATA_READ)
+                        break;
+        eeprom_cmd_end(ee_addr);
+
+        eeprom_extend_cmd(ee_addr, EE_EWDS_ADDR, addr_len);
+}
+
+static int cp_get_eeprom_len(struct net_device *dev)
+{
+        struct cp_private *cp = netdev_priv(dev);
+        int size;
+
+        spin_lock_irq(&cp->lock);
+        size = read_eeprom(cp->regs, 0, 8) == 0x8129 ? 256 : 128;
+        spin_unlock_irq(&cp->lock);
+
+        return size;
+}
+
+static int cp_get_eeprom(struct net_device *dev,
+                         struct ethtool_eeprom *eeprom, u8 *data)
+{
+        struct cp_private *cp = netdev_priv(dev);
+        unsigned int addr_len;
+        u16 val;
+        u32 offset = eeprom->offset >> 1;
+        u32 len = eeprom->len;
+        u32 i = 0;
+
+        eeprom->magic = CP_EEPROM_MAGIC;
+
+        spin_lock_irq(&cp->lock);
+
+        addr_len = read_eeprom(cp->regs, 0, 8) == 0x8129 ? 8 : 6;
+
+        if (eeprom->offset & 1) {
+                val = read_eeprom(cp->regs, offset, addr_len);
+                data[i++] = (u8)(val >> 8);
+                offset++;
+        }
+
+        while (i < len - 1) {
+                val = read_eeprom(cp->regs, offset, addr_len);
+                data[i++] = (u8)val;
+                data[i++] = (u8)(val >> 8);
+                offset++;
+        }
+
+        if (i < len) {
+                val = read_eeprom(cp->regs, offset, addr_len);
+                data[i] = (u8)val;
+        }
+
+        spin_unlock_irq(&cp->lock);
+        return 0;
+}
+
+static int cp_set_eeprom(struct net_device *dev,
+                         struct ethtool_eeprom *eeprom, u8 *data)
+{
+        struct cp_private *cp = netdev_priv(dev);
+        unsigned int addr_len;
+        u16 val;
+        u32 offset = eeprom->offset >> 1;
+        u32 len = eeprom->len;
+        u32 i = 0;
+
+        if (eeprom->magic != CP_EEPROM_MAGIC)
+                return -EINVAL;
+
+        spin_lock_irq(&cp->lock);
+
+        addr_len = read_eeprom(cp->regs, 0, 8) == 0x8129 ? 8 : 6;
+
+        if (eeprom->offset & 1) {
+                val = read_eeprom(cp->regs, offset, addr_len) & 0xff;
+                val |= (u16)data[i++] << 8;
+                write_eeprom(cp->regs, offset, val, addr_len);
+                offset++;
+        }
+
+        while (i < len - 1) {
+                val = (u16)data[i++];
+                val |= (u16)data[i++] << 8;
+                write_eeprom(cp->regs, offset, val, addr_len);
+                offset++;
+        }
+
+        if (i < len) {
+                val = read_eeprom(cp->regs, offset, addr_len) & 0xff00;
+                val |= (u16)data[i];
+                write_eeprom(cp->regs, offset, val, addr_len);
+        }
+
+        spin_unlock_irq(&cp->lock);
+        return 0;
+}
+
 /* Put the board into D3cold state and wait for WakeUp signal */
 static void cp_set_d3_state (struct cp_private *cp)
 {