[PATCH] intel ixp2000 network driver

The way the hardware and firmware work is that there is one shared RX
queue and IRQ for a number of different network interfaces.  Due to this,
we would like to process received packets for every interface in the same
NAPI poll handler, so we need a pseudo-device to schedule polling on.

What the driver currently does is that it always schedules polling for
the first network interface in the list, and processes packets for every
interface in the poll handler for that first interface -- however, this
scheme breaks down if the first network interface happens to not be up,
since netif_rx_schedule_prep() checks netif_running().

sky2 apparently has the same issue, and Stephen Hemminger suggested a
way to work around this: create a variant of netif_rx_schedule_prep()
that does not check netif_running().  I implemented this locally and
called it netif_rx_schedule_prep_notup(), and it seems to work well,
but it's something that probably not everyone would be happy with.

The ixp2000 is an ARM CPU with a high-speed network interface in the
CPU itself (full duplex 4Gb/s or 10Gb/s depending on the IXP model.)
The CPU package also contains 8 or 16 (again depending on the IXP
model) 'microengines', which are somewhat primitive but very fast
and efficient processor cores which can be used to offload various
things from the main CPU.

This driver makes the high-speed network interface in the CPU visible
and usable as a regular linux network device.  Currently, it only
supports the Radisys ENP2611 IXP board, but adding support for other
board types should be fairly easy.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/drivers/net/ixp2000/ixp2400-msf.h b/drivers/net/ixp2000/ixp2400-msf.h
new file mode 100644
index 000000000000..3ac1af2771da
--- /dev/null
+++ b/drivers/net/ixp2000/ixp2400-msf.h
@@ -0,0 +1,115 @@
+/*
+ * Generic library functions for the MSF (Media and Switch Fabric) unit
+ * found on the Intel IXP2400 network processor.
+ *
+ * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org>
+ * Dedicated to Marija Kulikova.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ */
+
+#ifndef __IXP2400_MSF_H
+#define __IXP2400_MSF_H
+
+struct ixp2400_msf_parameters
+{
+        u32                             rx_mode;
+        unsigned                        rxclk01_multiplier:2;
+        unsigned                        rxclk23_multiplier:2;
+        unsigned                        rx_poll_ports:6;
+        u32                             rx_channel_mode[4];
+
+        u32                             tx_mode;
+        unsigned                        txclk01_multiplier:2;
+        unsigned                        txclk23_multiplier:2;
+        unsigned                        tx_poll_ports:6;
+        u32                             tx_channel_mode[4];
+};
+
+void ixp2400_msf_init(struct ixp2400_msf_parameters *mp);
+
+#define IXP2400_PLL_MULTIPLIER_48               0x00
+#define IXP2400_PLL_MULTIPLIER_24               0x01
+#define IXP2400_PLL_MULTIPLIER_16               0x02
+#define IXP2400_PLL_MULTIPLIER_12               0x03
+
+#define IXP2400_RX_MODE_CSIX                    0x00400000
+#define IXP2400_RX_MODE_UTOPIA_POS              0x00000000
+#define IXP2400_RX_MODE_WIDTH_MASK              0x00300000
+#define IXP2400_RX_MODE_1x16_2x8                0x00300000
+#define IXP2400_RX_MODE_4x8                     0x00200000
+#define IXP2400_RX_MODE_2x16                    0x00100000
+#define IXP2400_RX_MODE_1x32                    0x00000000
+#define IXP2400_RX_MODE_MPHY                    0x00080000
+#define IXP2400_RX_MODE_SPHY                    0x00000000
+#define IXP2400_RX_MODE_MPHY_32                 0x00040000
+#define IXP2400_RX_MODE_MPHY_4                  0x00000000
+#define IXP2400_RX_MODE_MPHY_POLLED_STATUS      0x00020000
+#define IXP2400_RX_MODE_MPHY_DIRECT_STATUS      0x00000000
+#define IXP2400_RX_MODE_CBUS_FULL_DUPLEX        0x00010000
+#define IXP2400_RX_MODE_CBUS_SIMPLEX            0x00000000
+#define IXP2400_RX_MODE_MPHY_LEVEL2             0x00004000
+#define IXP2400_RX_MODE_MPHY_LEVEL3             0x00000000
+#define IXP2400_RX_MODE_CBUS_8BIT               0x00002000
+#define IXP2400_RX_MODE_CBUS_4BIT               0x00000000
+#define IXP2400_RX_MODE_CSIX_SINGLE_FREELIST    0x00000200
+#define IXP2400_RX_MODE_CSIX_SPLIT_FREELISTS    0x00000000
+#define IXP2400_RX_MODE_RBUF_SIZE_MASK          0x0000000c
+#define IXP2400_RX_MODE_RBUF_SIZE_256           0x00000008
+#define IXP2400_RX_MODE_RBUF_SIZE_128           0x00000004
+#define IXP2400_RX_MODE_RBUF_SIZE_64            0x00000000
+
+#define IXP2400_PORT_RX_MODE_SLAVE              0x00000040
+#define IXP2400_PORT_RX_MODE_MASTER             0x00000000
+#define IXP2400_PORT_RX_MODE_POS_PHY_L3         0x00000020
+#define IXP2400_PORT_RX_MODE_POS_PHY_L2         0x00000000
+#define IXP2400_PORT_RX_MODE_POS_PHY            0x00000010
+#define IXP2400_PORT_RX_MODE_UTOPIA             0x00000000
+#define IXP2400_PORT_RX_MODE_EVEN_PARITY        0x0000000c
+#define IXP2400_PORT_RX_MODE_ODD_PARITY         0x00000008
+#define IXP2400_PORT_RX_MODE_NO_PARITY          0x00000000
+#define IXP2400_PORT_RX_MODE_UTOPIA_BIG_CELLS   0x00000002
+#define IXP2400_PORT_RX_MODE_UTOPIA_NORMAL_CELLS        0x00000000
+#define IXP2400_PORT_RX_MODE_2_CYCLE_DECODE     0x00000001
+#define IXP2400_PORT_RX_MODE_1_CYCLE_DECODE     0x00000000
+
+#define IXP2400_TX_MODE_CSIX                    0x00400000
+#define IXP2400_TX_MODE_UTOPIA_POS              0x00000000
+#define IXP2400_TX_MODE_WIDTH_MASK              0x00300000
+#define IXP2400_TX_MODE_1x16_2x8                0x00300000
+#define IXP2400_TX_MODE_4x8                     0x00200000
+#define IXP2400_TX_MODE_2x16                    0x00100000
+#define IXP2400_TX_MODE_1x32                    0x00000000
+#define IXP2400_TX_MODE_MPHY                    0x00080000
+#define IXP2400_TX_MODE_SPHY                    0x00000000
+#define IXP2400_TX_MODE_MPHY_32                 0x00040000
+#define IXP2400_TX_MODE_MPHY_4                  0x00000000
+#define IXP2400_TX_MODE_MPHY_POLLED_STATUS      0x00020000
+#define IXP2400_TX_MODE_MPHY_DIRECT_STATUS      0x00000000
+#define IXP2400_TX_MODE_CBUS_FULL_DUPLEX        0x00010000
+#define IXP2400_TX_MODE_CBUS_SIMPLEX            0x00000000
+#define IXP2400_TX_MODE_MPHY_LEVEL2             0x00004000
+#define IXP2400_TX_MODE_MPHY_LEVEL3             0x00000000
+#define IXP2400_TX_MODE_CBUS_8BIT               0x00002000
+#define IXP2400_TX_MODE_CBUS_4BIT               0x00000000
+#define IXP2400_TX_MODE_TBUF_SIZE_MASK          0x0000000c
+#define IXP2400_TX_MODE_TBUF_SIZE_256           0x00000008
+#define IXP2400_TX_MODE_TBUF_SIZE_128           0x00000004
+#define IXP2400_TX_MODE_TBUF_SIZE_64            0x00000000
+
+#define IXP2400_PORT_TX_MODE_SLAVE              0x00000040
+#define IXP2400_PORT_TX_MODE_MASTER             0x00000000
+#define IXP2400_PORT_TX_MODE_POS_PHY            0x00000010
+#define IXP2400_PORT_TX_MODE_UTOPIA             0x00000000
+#define IXP2400_PORT_TX_MODE_EVEN_PARITY        0x0000000c
+#define IXP2400_PORT_TX_MODE_ODD_PARITY         0x00000008
+#define IXP2400_PORT_TX_MODE_NO_PARITY          0x00000000
+#define IXP2400_PORT_TX_MODE_UTOPIA_BIG_CELLS   0x00000002
+#define IXP2400_PORT_TX_MODE_2_CYCLE_DECODE     0x00000001
+#define IXP2400_PORT_TX_MODE_1_CYCLE_DECODE     0x00000000
+
+
+#endif